blob: bada636d1065c5451d3e42f54820757e4cf30455 [file] [log] [blame]
Sam Ravnborgdaa93fa2007-11-12 20:54:30 +01001# Select 32 or 64 bit
2config 64BIT
Sam Ravnborg68409992007-11-17 15:37:31 +01003 bool "64-bit kernel" if ARCH = "x86"
David Woodhouseffee0de2012-12-20 21:51:55 +00004 default ARCH != "i386"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01005 ---help---
Sam Ravnborgdaa93fa2007-11-12 20:54:30 +01006 Say yes to build a 64-bit kernel - formerly known as x86_64
7 Say no to build a 32-bit kernel - formerly known as i386
8
9config X86_32
Jan Beulich3120e252012-09-10 12:41:45 +010010 def_bool y
11 depends on !64BIT
Sam Ravnborgdaa93fa2007-11-12 20:54:30 +010012
13config X86_64
Jan Beulich3120e252012-09-10 12:41:45 +010014 def_bool y
15 depends on 64BIT
Sam Ravnborg1032c0b2007-11-06 21:35:08 +010016
17### Arch settings
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010018config X86
Harvey Harrison3c2362e2008-01-30 13:31:03 +010019 def_bool y
Ingo Molnar6471b822015-06-03 10:00:13 +020020 select ACPI_LEGACY_TABLES_LOOKUP if ACPI
21 select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI
22 select ANON_INODES
23 select ARCH_CLOCKSOURCE_DATA
24 select ARCH_DISCARD_MEMBLOCK
Aleksey Makarov91dda512016-06-20 13:56:12 +030025 select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
Dan Williams21266be2015-11-19 18:19:29 -080026 select ARCH_HAS_DEVMEM_IS_ALLOWED
Ingo Molnar6471b822015-06-03 10:00:13 +020027 select ARCH_HAS_ELF_RANDOMIZE
Linus Torvalds72d93102014-09-13 11:14:53 -070028 select ARCH_HAS_FAST_MULTIPLIER
Riku Voipio957e3fa2014-12-12 16:57:44 -080029 select ARCH_HAS_GCOV_PROFILE_ALL
Yisheng Xie461a7182016-10-07 17:01:46 -070030 select ARCH_HAS_GIGANTIC_PAGE if X86_64
Dmitry Vyukov5c9a8752016-03-22 14:27:30 -070031 select ARCH_HAS_KCOV if X86_64
Dan Williams96601ad2015-08-24 18:29:38 -040032 select ARCH_HAS_PMEM_API if X86_64
Ross Zwisler67a3e8f2015-08-27 13:14:20 -060033 select ARCH_HAS_MMIO_FLUSH
Ingo Molnar6471b822015-06-03 10:00:13 +020034 select ARCH_HAS_SG_CHAIN
Andrey Ryabininc6d30852016-01-20 15:00:55 -080035 select ARCH_HAS_UBSAN_SANITIZE_ALL
Ingo Molnar6471b822015-06-03 10:00:13 +020036 select ARCH_HAVE_NMI_SAFE_CMPXCHG
37 select ARCH_MIGHT_HAVE_ACPI_PDC if ACPI
Mark Salter77fbbc82013-10-07 22:18:07 -040038 select ARCH_MIGHT_HAVE_PC_PARPORT
Mark Salter5e2c18c2014-01-01 11:34:16 -080039 select ARCH_MIGHT_HAVE_PC_SERIO
Ingo Molnar6471b822015-06-03 10:00:13 +020040 select ARCH_SUPPORTS_ATOMIC_RMW
Mel Gorman3b242c62015-06-30 14:57:13 -070041 select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
Ingo Molnar6471b822015-06-03 10:00:13 +020042 select ARCH_SUPPORTS_INT128 if X86_64
43 select ARCH_SUPPORTS_NUMA_BALANCING if X86_64
44 select ARCH_USE_BUILTIN_BSWAP
45 select ARCH_USE_CMPXCHG_LOCKREF if X86_64
46 select ARCH_USE_QUEUED_RWLOCKS
47 select ARCH_USE_QUEUED_SPINLOCKS
Mel Gorman72b252a2015-09-04 15:47:32 -070048 select ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH if SMP
Ingo Molnar5aaeb5c2015-07-17 12:28:12 +020049 select ARCH_WANTS_DYNAMIC_TASK_STRUCT
Ingo Molnarda4276b2009-01-07 11:05:10 +010050 select ARCH_WANT_FRAME_POINTERS
Ingo Molnar6471b822015-06-03 10:00:13 +020051 select ARCH_WANT_IPC_PARSE_VERSION if X86_32
Ingo Molnar6471b822015-06-03 10:00:13 +020052 select BUILDTIME_EXTABLE_SORT
53 select CLKEVT_I8253
54 select CLKSRC_I8253 if X86_32
55 select CLOCKSOURCE_VALIDATE_LAST_CYCLE
56 select CLOCKSOURCE_WATCHDOG
57 select CLONE_BACKWARDS if X86_32
58 select COMPAT_OLD_SIGACTION if IA32_EMULATION
59 select DCACHE_WORD_ACCESS
Linus Torvalds45471cd2015-06-24 19:52:06 -070060 select EDAC_ATOMIC_SCRUB
61 select EDAC_SUPPORT
Ingo Molnar6471b822015-06-03 10:00:13 +020062 select GENERIC_CLOCKEVENTS
63 select GENERIC_CLOCKEVENTS_BROADCAST if X86_64 || (X86_32 && X86_LOCAL_APIC)
64 select GENERIC_CLOCKEVENTS_MIN_ADJUST
65 select GENERIC_CMOS_UPDATE
66 select GENERIC_CPU_AUTOPROBE
67 select GENERIC_EARLY_IOREMAP
68 select GENERIC_FIND_FIRST_BIT
69 select GENERIC_IOMAP
70 select GENERIC_IRQ_PROBE
71 select GENERIC_IRQ_SHOW
72 select GENERIC_PENDING_IRQ if SMP
73 select GENERIC_SMP_IDLE_THREAD
74 select GENERIC_STRNCPY_FROM_USER
75 select GENERIC_STRNLEN_USER
76 select GENERIC_TIME_VSYSCALL
77 select HAVE_ACPI_APEI if ACPI
78 select HAVE_ACPI_APEI_NMI if ACPI
79 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
80 select HAVE_AOUT if X86_32
81 select HAVE_ARCH_AUDITSYSCALL
Kees Cook5b710f32016-06-23 15:04:01 -070082 select HAVE_ARCH_HARDENED_USERCOPY
Ingo Molnar6471b822015-06-03 10:00:13 +020083 select HAVE_ARCH_HUGE_VMAP if X86_64 || X86_PAE
84 select HAVE_ARCH_JUMP_LABEL
85 select HAVE_ARCH_KASAN if X86_64 && SPARSEMEM_VMEMMAP
86 select HAVE_ARCH_KGDB
87 select HAVE_ARCH_KMEMCHECK
Daniel Cashman9e08f572016-01-14 15:20:06 -080088 select HAVE_ARCH_MMAP_RND_BITS if MMU
89 select HAVE_ARCH_MMAP_RND_COMPAT_BITS if MMU && COMPAT
Ingo Molnar6471b822015-06-03 10:00:13 +020090 select HAVE_ARCH_SECCOMP_FILTER
91 select HAVE_ARCH_SOFT_DIRTY if X86_64
92 select HAVE_ARCH_TRACEHOOK
93 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
Kees Cook0f60a8e2016-07-12 16:19:48 -070094 select HAVE_ARCH_WITHIN_STACK_FRAMES
Daniel Borkmann60777762016-05-13 19:08:28 +020095 select HAVE_EBPF_JIT if X86_64
Andy Lutomirskie37e43a2016-08-11 02:35:23 -070096 select HAVE_ARCH_VMAP_STACK if X86_64
Ingo Molnar6471b822015-06-03 10:00:13 +020097 select HAVE_CC_STACKPROTECTOR
98 select HAVE_CMPXCHG_DOUBLE
99 select HAVE_CMPXCHG_LOCAL
100 select HAVE_CONTEXT_TRACKING if X86_64
Josh Triplettc1bd55f2015-06-30 15:00:00 -0700101 select HAVE_COPY_THREAD_TLS
Ingo Molnar6471b822015-06-03 10:00:13 +0200102 select HAVE_C_RECORDMCOUNT
103 select HAVE_DEBUG_KMEMLEAK
104 select HAVE_DEBUG_STACKOVERFLOW
105 select HAVE_DMA_API_DEBUG
Akinobu Mita9c5a3622014-06-04 16:06:50 -0700106 select HAVE_DMA_CONTIGUOUS
Steven Rostedt677aa9f2008-05-17 00:01:36 -0400107 select HAVE_DYNAMIC_FTRACE
Masami Hiramatsu06aeaae2012-09-28 17:15:17 +0900108 select HAVE_DYNAMIC_FTRACE_WITH_REGS
Johannes Berg58340a02008-07-25 01:45:33 -0700109 select HAVE_EFFICIENT_UNALIGNED_ACCESS
Jiri Slaby5f56a5d2016-05-20 17:00:16 -0700110 select HAVE_EXIT_THREAD
Ingo Molnar6471b822015-06-03 10:00:13 +0200111 select HAVE_FENTRY if X86_64
112 select HAVE_FTRACE_MCOUNT_RECORD
Ingo Molnar6471b822015-06-03 10:00:13 +0200113 select HAVE_FUNCTION_GRAPH_TRACER
114 select HAVE_FUNCTION_TRACER
Emese Revfy6b90bd42016-05-24 00:09:38 +0200115 select HAVE_GCC_PLUGINS
Ingo Molnar6471b822015-06-03 10:00:13 +0200116 select HAVE_GENERIC_DMA_COHERENT if X86_32
K.Prasad0067f122009-06-01 23:43:57 +0530117 select HAVE_HW_BREAKPOINT
Ingo Molnar6471b822015-06-03 10:00:13 +0200118 select HAVE_IDE
119 select HAVE_IOREMAP_PROT
120 select HAVE_IRQ_EXIT_ON_IRQ_STACK if X86_64
121 select HAVE_IRQ_TIME_ACCOUNTING
122 select HAVE_KERNEL_BZIP2
123 select HAVE_KERNEL_GZIP
124 select HAVE_KERNEL_LZ4
125 select HAVE_KERNEL_LZMA
126 select HAVE_KERNEL_LZO
127 select HAVE_KERNEL_XZ
128 select HAVE_KPROBES
129 select HAVE_KPROBES_ON_FTRACE
130 select HAVE_KRETPROBES
131 select HAVE_KVM
132 select HAVE_LIVEPATCH if X86_64
133 select HAVE_MEMBLOCK
134 select HAVE_MEMBLOCK_NODE_MAP
Frederic Weisbecker01027522010-04-11 18:55:56 +0200135 select HAVE_MIXED_BREAKPOINTS_REGS
Petr Mladek42a0bb32016-05-20 17:00:33 -0700136 select HAVE_NMI
Ingo Molnar6471b822015-06-03 10:00:13 +0200137 select HAVE_OPROFILE
138 select HAVE_OPTPROBES
139 select HAVE_PCSPKR_PLATFORM
140 select HAVE_PERF_EVENTS
Frederic Weisbeckerc01d4322010-05-15 22:57:48 +0200141 select HAVE_PERF_EVENTS_NMI
Jiri Olsac5e63192012-08-07 15:20:36 +0200142 select HAVE_PERF_REGS
Jiri Olsac5ebced2012-08-07 15:20:40 +0200143 select HAVE_PERF_USER_STACK_DUMP
Ingo Molnar6471b822015-06-03 10:00:13 +0200144 select HAVE_REGS_AND_STACK_ACCESS_API
145 select HAVE_SYSCALL_TRACEPOINTS
Brian Gerst0c3619e2015-06-22 07:55:20 -0400146 select HAVE_UID16 if X86_32 || IA32_EMULATION
Ingo Molnar6471b822015-06-03 10:00:13 +0200147 select HAVE_UNSTABLE_SCHED_CLOCK
Avi Kivity7c68af62009-09-19 09:40:22 +0300148 select HAVE_USER_RETURN_NOTIFIER
Thomas Gleixnerc01858082011-02-07 02:24:08 +0100149 select IRQ_FORCED_THREADING
Ingo Molnar6471b822015-06-03 10:00:13 +0200150 select MODULES_USE_ELF_RELA if X86_64
151 select MODULES_USE_ELF_REL if X86_32
152 select OLD_SIGACTION if X86_32
153 select OLD_SIGSUSPEND3 if X86_32 || IA32_EMULATION
154 select PERF_EVENTS
Prarit Bhargava3195ef52013-02-14 12:02:54 -0500155 select RTC_LIB
Arnd Bergmannd6faca42016-06-01 16:46:23 +0200156 select RTC_MC146818_LIB
Ingo Molnar6471b822015-06-03 10:00:13 +0200157 select SPARSE_IRQ
Pranith Kumar83fe27e2014-12-05 11:24:45 -0500158 select SRCU
Ingo Molnar6471b822015-06-03 10:00:13 +0200159 select SYSCTL_EXCEPTION_TRACE
Andy Lutomirski15f4eae2016-09-13 14:29:25 -0700160 select THREAD_INFO_IN_TASK
Ingo Molnar6471b822015-06-03 10:00:13 +0200161 select USER_STACKTRACE_SUPPORT
162 select VIRT_TO_BUS
163 select X86_DEV_DMA_OPS if X86_64
164 select X86_FEATURE_NAMES if PROC_FS
Josh Poimboeufd4883d52016-02-28 22:22:43 -0600165 select HAVE_STACK_VALIDATION if X86_64
Dave Hansen63c17fb2016-02-12 13:02:08 -0800166 select ARCH_USES_HIGH_VMA_FLAGS if X86_INTEL_MEMORY_PROTECTION_KEYS
Dave Hansen66d37572016-02-12 13:02:32 -0800167 select ARCH_HAS_PKEYS if X86_INTEL_MEMORY_PROTECTION_KEYS
Balbir Singh7d8330a2008-02-10 12:46:28 +0530168
Ingo Molnarba7e4d12009-06-06 13:58:12 +0200169config INSTRUCTION_DECODER
Jan Beulich3120e252012-09-10 12:41:45 +0100170 def_bool y
171 depends on KPROBES || PERF_EVENTS || UPROBES
Ingo Molnarba7e4d12009-06-06 13:58:12 +0200172
Linus Torvalds51b26ad2009-04-26 10:12:47 -0700173config OUTPUT_FORMAT
174 string
175 default "elf32-i386" if X86_32
176 default "elf64-x86-64" if X86_64
177
Sam Ravnborg73531902008-05-25 23:03:18 +0200178config ARCH_DEFCONFIG
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +0200179 string
Sam Ravnborg73531902008-05-25 23:03:18 +0200180 default "arch/x86/configs/i386_defconfig" if X86_32
181 default "arch/x86/configs/x86_64_defconfig" if X86_64
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +0200182
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100183config LOCKDEP_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100184 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100185
186config STACKTRACE_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100187 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100188
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100189config MMU
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100190 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100191
Daniel Cashman9e08f572016-01-14 15:20:06 -0800192config ARCH_MMAP_RND_BITS_MIN
193 default 28 if 64BIT
194 default 8
195
196config ARCH_MMAP_RND_BITS_MAX
197 default 32 if 64BIT
198 default 16
199
200config ARCH_MMAP_RND_COMPAT_BITS_MIN
201 default 8
202
203config ARCH_MMAP_RND_COMPAT_BITS_MAX
204 default 16
205
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100206config SBUS
207 bool
208
FUJITA Tomonori3bc4e452010-03-10 15:23:22 -0800209config NEED_DMA_MAP_STATE
Jan Beulich3120e252012-09-10 12:41:45 +0100210 def_bool y
Konrad Rzeszutek Wilka6dfa122015-04-17 15:04:48 -0400211 depends on X86_64 || INTEL_IOMMU || DMA_API_DEBUG || SWIOTLB
FUJITA Tomonori3bc4e452010-03-10 15:23:22 -0800212
FUJITA Tomonori18e98302010-05-26 14:44:32 -0700213config NEED_SG_DMA_LENGTH
Andrew Morton4a14d842010-05-26 14:44:33 -0700214 def_bool y
FUJITA Tomonori18e98302010-05-26 14:44:32 -0700215
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100216config GENERIC_ISA_DMA
Jan Beulich3120e252012-09-10 12:41:45 +0100217 def_bool y
218 depends on ISA_DMA_API
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100219
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100220config GENERIC_BUG
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100221 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100222 depends on BUG
Jan Beulichb93a5312008-12-16 11:40:27 +0000223 select GENERIC_BUG_RELATIVE_POINTERS if X86_64
224
225config GENERIC_BUG_RELATIVE_POINTERS
226 bool
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100227
228config GENERIC_HWEIGHT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100229 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100230
231config ARCH_MAY_HAVE_PC_FDC
Jan Beulich3120e252012-09-10 12:41:45 +0100232 def_bool y
233 depends on ISA_DMA_API
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100234
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100235config RWSEM_XCHGADD_ALGORITHM
Jan Beulich3120e252012-09-10 12:41:45 +0100236 def_bool y
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100237
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100238config GENERIC_CALIBRATE_DELAY
239 def_bool y
240
venkatesh.pallipadi@intel.com9a0b8412008-01-31 17:35:06 -0800241config ARCH_HAS_CPU_RELAX
242 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100243
Pekka Enberg1b27d052008-04-28 02:12:22 -0700244config ARCH_HAS_CACHE_LINE_SIZE
245 def_bool y
246
Mike Travisdd5af902008-01-30 13:33:32 +0100247config HAVE_SETUP_PER_CPU_AREA
Brian Gerst89c9c4c2009-01-27 12:56:48 +0900248 def_bool y
travis@sgi.comb32ef632008-01-30 13:32:51 +0100249
Tejun Heo08fc4582009-08-14 15:00:49 +0900250config NEED_PER_CPU_EMBED_FIRST_CHUNK
251 def_bool y
252
253config NEED_PER_CPU_PAGE_FIRST_CHUNK
Tejun Heo11124412009-02-20 16:29:09 +0900254 def_bool y
255
Johannes Berg801e4062007-12-08 02:12:39 +0100256config ARCH_HIBERNATION_POSSIBLE
257 def_bool y
Johannes Berg801e4062007-12-08 02:12:39 +0100258
Johannes Bergf4cb5702007-12-08 02:14:00 +0100259config ARCH_SUSPEND_POSSIBLE
260 def_bool y
Johannes Bergf4cb5702007-12-08 02:14:00 +0100261
Steve Cappercfe28c52013-04-29 14:29:48 +0100262config ARCH_WANT_HUGE_PMD_SHARE
263 def_bool y
264
Steve Capper53313b22013-04-30 08:03:42 +0100265config ARCH_WANT_GENERAL_HUGETLB
266 def_bool y
267
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100268config ZONE_DMA32
Jan Beuliche0fd24a2015-02-05 15:39:34 +0000269 def_bool y if X86_64
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100270
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100271config AUDIT_ARCH
Jan Beuliche0fd24a2015-02-05 15:39:34 +0000272 def_bool y if X86_64
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100273
Ingo Molnar765c68b2008-04-09 11:03:37 +0200274config ARCH_SUPPORTS_OPTIMIZED_INLINING
275 def_bool y
276
Akinobu Mita6a11f752009-03-31 15:23:17 -0700277config ARCH_SUPPORTS_DEBUG_PAGEALLOC
278 def_bool y
279
Andrey Ryabinind6f2d752015-07-02 12:09:38 +0300280config KASAN_SHADOW_OFFSET
281 hex
282 depends on KASAN
283 default 0xdffffc0000000000
284
Shane Wang69575d32009-09-01 18:25:07 -0700285config HAVE_INTEL_TXT
286 def_bool y
Kees Cook6ea30382012-10-02 11:16:47 -0700287 depends on INTEL_IOMMU && ACPI
Shane Wang69575d32009-09-01 18:25:07 -0700288
Sam Ravnborg6b0c3d42008-01-30 13:32:27 +0100289config X86_32_SMP
290 def_bool y
291 depends on X86_32 && SMP
292
293config X86_64_SMP
294 def_bool y
295 depends on X86_64 && SMP
296
Tejun Heoccbeed32009-02-09 22:17:40 +0900297config X86_32_LAZY_GS
298 def_bool y
Tejun Heo60a53172009-02-09 22:17:40 +0900299 depends on X86_32 && !CC_STACKPROTECTOR
Tejun Heoccbeed32009-02-09 22:17:40 +0900300
Srikar Dronamraju2b144492012-02-09 14:56:42 +0530301config ARCH_SUPPORTS_UPROBES
302 def_bool y
303
Rob Herringd20642f2014-04-18 17:19:54 -0500304config FIX_EARLYCON_MEM
305 def_bool y
306
Kees Cook9ccaf772016-02-17 14:41:14 -0800307config DEBUG_RODATA
308 def_bool y
309
Kirill A. Shutemov98233362015-04-14 15:46:14 -0700310config PGTABLE_LEVELS
311 int
312 default 4 if X86_64
313 default 3 if X86_PAE
314 default 2
315
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100316source "init/Kconfig"
Matt Helsleydc52ddc2008-10-18 20:27:21 -0700317source "kernel/Kconfig.freezer"
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100318
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100319menu "Processor type and features"
320
Randy Dunlap5ee71532012-01-16 11:57:18 -0800321config ZONE_DMA
322 bool "DMA memory allocation support" if EXPERT
323 default y
324 help
325 DMA memory allocation support allows devices with less than 32-bit
326 addressing to allocate within the first 16MB of address space.
327 Disable if no such devices will be used.
328
329 If unsure, say Y.
330
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100331config SMP
332 bool "Symmetric multi-processing support"
333 ---help---
334 This enables support for systems with more than one CPU. If you have
Robert Graffham4a474152014-01-23 15:55:29 -0800335 a system with only one CPU, say N. If you have a system with more
336 than one CPU, say Y.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100337
Robert Graffham4a474152014-01-23 15:55:29 -0800338 If you say N here, the kernel will run on uni- and multiprocessor
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100339 machines, but will use only one CPU of a multiprocessor machine. If
340 you say Y here, the kernel will run on many, but not all,
Robert Graffham4a474152014-01-23 15:55:29 -0800341 uniprocessor machines. On a uniprocessor machine, the kernel
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100342 will run faster if you say N here.
343
344 Note that if you say Y here and choose architecture "586" or
345 "Pentium" under "Processor family", the kernel will not work on 486
346 architectures. Similarly, multiprocessor kernels for the "PPro"
347 architecture may not work on all Pentium based boards.
348
349 People using multiprocessor machines who say Y here should also say
350 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
351 Management" code will be disabled if you say Y here.
352
Paul Bolle395cf962011-08-15 02:02:26 +0200353 See also <file:Documentation/x86/i386/IO-APIC.txt>,
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100354 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
355 <http://www.tldp.org/docs.html#howto>.
356
357 If you don't know what to do here, say N.
358
Josh Triplett9def39be2013-10-30 08:09:45 -0700359config X86_FEATURE_NAMES
360 bool "Processor feature human-readable names" if EMBEDDED
361 default y
362 ---help---
363 This option compiles in a table of x86 feature bits and corresponding
364 names. This is required to support /proc/cpuinfo and a few kernel
365 messages. You can disable this to save space, at the expense of
366 making those few kernel messages show numeric feature bits instead.
367
368 If in doubt, say Y.
369
Borislav Petkov6e1315f2015-12-07 10:39:42 +0100370config X86_FAST_FEATURE_TESTS
371 bool "Fast CPU feature tests" if EMBEDDED
372 default y
373 ---help---
374 Some fast-paths in the kernel depend on the capabilities of the CPU.
375 Say Y here for the kernel to patch in the appropriate code at runtime
376 based on the capabilities of the CPU. The infrastructure for patching
377 code at runtime takes up some additional space; space-constrained
378 embedded systems may wish to say N here to produce smaller, slightly
379 slower code.
380
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800381config X86_X2APIC
382 bool "Support x2apic"
Jan Kiszka19e3d602015-05-04 17:58:01 +0200383 depends on X86_LOCAL_APIC && X86_64 && (IRQ_REMAP || HYPERVISOR_GUEST)
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800384 ---help---
385 This enables x2apic support on CPUs that have this feature.
386
387 This allows 32-bit apic IDs (so it can support very large systems),
388 and accesses the local apic via MSRs not via mmio.
389
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800390 If you don't know what to do here, say N.
391
Yinghai Lu6695c852008-06-19 12:13:09 -0700392config X86_MPPARSE
Bin Gao6e87f9b72012-10-25 09:35:44 -0700393 bool "Enable MPS table" if ACPI || SFI
Jan Beulich7a527682008-10-30 10:38:24 +0000394 default y
Ingo Molnar5ab74722008-07-10 14:42:03 +0200395 depends on X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100396 ---help---
Yinghai Lu6695c852008-06-19 12:13:09 -0700397 For old smp systems that do not have proper acpi support. Newer systems
398 (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
Yinghai Lu6695c852008-06-19 12:13:09 -0700399
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800400config X86_BIGSMP
401 bool "Support for big SMP systems with more than 8 CPUs"
402 depends on X86_32 && SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100403 ---help---
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800404 This option is needed for the systems that have more than 8 CPUs
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100405
Jun Nakajimaddd70cf2013-01-21 17:23:09 +0000406config GOLDFISH
407 def_bool y
408 depends on X86_GOLDFISH
409
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800410if X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800411config X86_EXTENDED_PLATFORM
412 bool "Support for extended (non-PC) x86 platforms"
413 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100414 ---help---
Ingo Molnar06ac8342009-01-27 18:11:43 +0100415 If you disable this option then the kernel will only support
416 standard PC platforms. (which covers the vast majority of
417 systems out there.)
418
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800419 If you enable this option then you'll be able to select support
420 for the following (non-PC) 32 bit x86 platforms:
Ben Hutchingscb7b8022013-06-24 01:05:25 +0100421 Goldfish (Android emulator)
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800422 AMD Elan
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800423 RDC R-321x SoC
424 SGI 320/540 (Visual Workstation)
Alessandro Rubini83125a32012-04-04 19:40:21 +0200425 STA2X11-based (e.g. Northville)
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200426 Moorestown MID devices
Ingo Molnar06ac8342009-01-27 18:11:43 +0100427
428 If you have one of these systems, or if you want to build a
429 generic distribution kernel, say Y here - otherwise say N.
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800430endif
Ingo Molnar06ac8342009-01-27 18:11:43 +0100431
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800432if X86_64
433config X86_EXTENDED_PLATFORM
434 bool "Support for extended (non-PC) x86 platforms"
435 default y
436 ---help---
437 If you disable this option then the kernel will only support
438 standard PC platforms. (which covers the vast majority of
439 systems out there.)
440
441 If you enable this option then you'll be able to select support
442 for the following (non-PC) 64 bit x86 platforms:
Steffen Persvold44b111b2011-12-06 00:07:26 +0800443 Numascale NumaChip
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800444 ScaleMP vSMP
445 SGI Ultraviolet
446
447 If you have one of these systems, or if you want to build a
448 generic distribution kernel, say Y here - otherwise say N.
449endif
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800450# This is an alphabetically sorted list of 64 bit extended platforms
451# Please maintain the alphabetic order if and when there are additions
Steffen Persvold44b111b2011-12-06 00:07:26 +0800452config X86_NUMACHIP
453 bool "Numascale NumaChip"
454 depends on X86_64
455 depends on X86_EXTENDED_PLATFORM
456 depends on NUMA
457 depends on SMP
458 depends on X86_X2APIC
Daniel J Bluemanf9726bf2012-12-07 14:24:32 -0700459 depends on PCI_MMCONFIG
Steffen Persvold44b111b2011-12-06 00:07:26 +0800460 ---help---
461 Adds support for Numascale NumaChip large-SMP systems. Needed to
462 enable more than ~168 cores.
463 If you don't have one of these, you should say N here.
Nick Piggin03b48632009-01-20 04:36:04 +0100464
Ingo Molnar6a485652009-01-27 18:29:13 +0100465config X86_VSMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800466 bool "ScaleMP vSMP"
Borislav Petkov6276a072013-03-04 21:20:21 +0100467 select HYPERVISOR_GUEST
Ingo Molnar6a485652009-01-27 18:29:13 +0100468 select PARAVIRT
469 depends on X86_64 && PCI
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800470 depends on X86_EXTENDED_PLATFORM
Shai Fultheimead91d42012-04-16 10:39:35 +0300471 depends on SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100472 ---help---
Ingo Molnar6a485652009-01-27 18:29:13 +0100473 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
474 supposed to run on these EM64T-based machines. Only choose this option
475 if you have one of these machines.
476
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800477config X86_UV
478 bool "SGI Ultraviolet"
479 depends on X86_64
480 depends on X86_EXTENDED_PLATFORM
Jack Steiner54c28d22009-04-03 15:39:42 -0500481 depends on NUMA
Andrew Morton1ecb4ae2016-02-11 16:13:20 -0800482 depends on EFI
Suresh Siddha9d6c26e2009-04-20 13:02:31 -0700483 depends on X86_X2APIC
Ingo Molnar1222e562015-05-06 06:23:59 +0200484 depends on PCI
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800485 ---help---
486 This option is needed in order to support SGI Ultraviolet systems.
487 If you don't have one of these, you should say N here.
488
489# Following is an alphabetically sorted list of 32 bit extended platforms
490# Please maintain the alphabetic order if and when there are additions
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100491
Jun Nakajimaddd70cf2013-01-21 17:23:09 +0000492config X86_GOLDFISH
493 bool "Goldfish (Virtual Platform)"
Ben Hutchingscb7b8022013-06-24 01:05:25 +0100494 depends on X86_EXTENDED_PLATFORM
Jun Nakajimaddd70cf2013-01-21 17:23:09 +0000495 ---help---
496 Enable support for the Goldfish virtual platform used primarily
497 for Android development. Unless you are building for the Android
498 Goldfish emulator say N here.
499
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800500config X86_INTEL_CE
501 bool "CE4100 TV platform"
502 depends on PCI
503 depends on PCI_GODIRECT
Jiang Liu6084a6e2014-06-09 16:19:46 +0800504 depends on X86_IO_APIC
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800505 depends on X86_32
506 depends on X86_EXTENDED_PLATFORM
Dirk Brandewie37bc9f52010-11-09 12:08:08 -0800507 select X86_REBOOTFIXUPS
Sebastian Andrzej Siewiorda6b7372011-02-22 21:07:37 +0100508 select OF
509 select OF_EARLY_FLATTREE
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800510 ---help---
511 Select for the Intel CE media processor (CE4100) SOC.
512 This option compiles in support for the CE4100 SOC for settop
513 boxes and media devices.
514
David Cohen4cb9b002013-12-16 17:37:26 -0800515config X86_INTEL_MID
Alan Cox43605ef2011-07-12 17:49:29 +0100516 bool "Intel MID platform support"
Alan Cox43605ef2011-07-12 17:49:29 +0100517 depends on X86_EXTENDED_PLATFORM
David Cohenedc6bc72014-01-21 10:41:39 -0800518 depends on X86_PLATFORM_DEVICES
Alan Cox1ea7c672011-11-10 13:29:14 +0000519 depends on PCI
Andy Shevchenko3fda5bb2016-01-15 22:11:07 +0200520 depends on X86_64 || (PCI_GOANY && X86_32)
Alan Cox1ea7c672011-11-10 13:29:14 +0000521 depends on X86_IO_APIC
Alan Cox7c9c3a12011-12-29 14:43:16 +0000522 select SFI
David Cohen4cb9b002013-12-16 17:37:26 -0800523 select I2C
Alan Cox7c9c3a12011-12-29 14:43:16 +0000524 select DW_APB_TIMER
Alan Cox1ea7c672011-11-10 13:29:14 +0000525 select APB_TIMER
Alan Cox1ea7c672011-11-10 13:29:14 +0000526 select INTEL_SCU_IPC
Mika Westerberg15a713d2012-01-26 17:35:05 +0000527 select MFD_INTEL_MSIC
Alan Cox1ea7c672011-11-10 13:29:14 +0000528 ---help---
David Cohen4cb9b002013-12-16 17:37:26 -0800529 Select to build a kernel capable of supporting Intel MID (Mobile
530 Internet Device) platform systems which do not have the PCI legacy
531 interfaces. If you are building for a PC class system say N here.
Alan Cox1ea7c672011-11-10 13:29:14 +0000532
David Cohen4cb9b002013-12-16 17:37:26 -0800533 Intel MID platforms are based on an Intel processor and chipset which
534 consume less power than most of the x86 derivatives.
Alan Cox43605ef2011-07-12 17:49:29 +0100535
Bryan O'Donoghue8bbc2a12015-01-30 16:29:39 +0000536config X86_INTEL_QUARK
537 bool "Intel Quark platform support"
538 depends on X86_32
539 depends on X86_EXTENDED_PLATFORM
540 depends on X86_PLATFORM_DEVICES
541 depends on X86_TSC
542 depends on PCI
543 depends on PCI_GOANY
544 depends on X86_IO_APIC
545 select IOSF_MBI
546 select INTEL_IMR
Andy Shevchenko9ab6eb52015-03-05 17:24:04 +0200547 select COMMON_CLK
Bryan O'Donoghue8bbc2a12015-01-30 16:29:39 +0000548 ---help---
549 Select to include support for Quark X1000 SoC.
550 Say Y here if you have a Quark based system such as the Arduino
551 compatible Intel Galileo.
552
Vadim Pasternak58cbbee2016-09-22 21:13:42 +0000553config MLX_PLATFORM
554 tristate "Mellanox Technologies platform support"
555 depends on X86_64
556 depends on X86_EXTENDED_PLATFORM
557 ---help---
558 This option enables system support for the Mellanox Technologies
559 platform.
560
561 Say Y here if you are building a kernel for Mellanox system.
562
563 Otherwise, say N.
564
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000565config X86_INTEL_LPSS
566 bool "Intel Low Power Subsystem Support"
Andy Shevchenkoeebb3e82015-12-12 02:45:06 +0100567 depends on X86 && ACPI
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000568 select COMMON_CLK
Mathias Nyman0f531432013-09-13 17:02:29 +0300569 select PINCTRL
Andy Shevchenkoeebb3e82015-12-12 02:45:06 +0100570 select IOSF_MBI
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000571 ---help---
572 Select to build support for Intel Low Power Subsystem such as
573 found on Intel Lynxpoint PCH. Selecting this option enables
Mathias Nyman0f531432013-09-13 17:02:29 +0300574 things like clock tree (common clock framework) and pincontrol
575 which are needed by the LPSS peripheral drivers.
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000576
Ken Xue92082a82015-02-06 08:27:51 +0800577config X86_AMD_PLATFORM_DEVICE
578 bool "AMD ACPI2Platform devices support"
579 depends on ACPI
580 select COMMON_CLK
581 select PINCTRL
582 ---help---
583 Select to interpret AMD specific ACPI device to platform device
584 such as I2C, UART, GPIO found on AMD Carrizo and later chipsets.
585 I2C and UART depend on COMMON_CLK to set clock. GPIO driver is
586 implemented under PINCTRL subsystem.
587
David E. Boxced3ce72014-09-17 22:13:50 -0700588config IOSF_MBI
589 tristate "Intel SoC IOSF Sideband support for SoC platforms"
590 depends on PCI
591 ---help---
592 This option enables sideband register access support for Intel SoC
593 platforms. On these platforms the IOSF sideband is used in lieu of
594 MSR's for some register accesses, mostly but not limited to thermal
595 and power. Drivers may query the availability of this device to
596 determine if they need the sideband in order to work on these
597 platforms. The sideband is available on the following SoC products.
598 This list is not meant to be exclusive.
599 - BayTrail
600 - Braswell
601 - Quark
602
603 You should say Y if you are running a kernel on one of these SoC's.
604
David E. Boxed2226b2014-09-17 22:13:51 -0700605config IOSF_MBI_DEBUG
606 bool "Enable IOSF sideband access through debugfs"
607 depends on IOSF_MBI && DEBUG_FS
608 ---help---
609 Select this option to expose the IOSF sideband access registers (MCR,
610 MDR, MCRX) through debugfs to write and read register information from
611 different units on the SoC. This is most useful for obtaining device
612 state information for debug and analysis. As this is a general access
613 mechanism, users of this option would have specific knowledge of the
614 device they want to access.
615
616 If you don't require the option or are in doubt, say N.
617
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800618config X86_RDC321X
619 bool "RDC R-321x SoC"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100620 depends on X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800621 depends on X86_EXTENDED_PLATFORM
622 select M486
623 select X86_REBOOTFIXUPS
624 ---help---
625 This option is needed for RDC R-321x system-on-chip, also known
626 as R-8610-(G).
627 If you don't have one of these chips, you should say N here.
628
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100629config X86_32_NON_STANDARD
Ingo Molnar9c398012009-01-27 18:24:57 +0100630 bool "Support non-standard 32-bit SMP architectures"
631 depends on X86_32 && SMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800632 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100633 ---help---
H. Peter Anvinb5660ba2014-02-25 12:14:06 -0800634 This option compiles in the bigsmp and STA2X11 default
635 subarchitectures. It is intended for a generic binary
636 kernel. If you select them all, kernel will probe it one by
637 one and will fallback to default.
Yinghai Lud49c4282008-06-08 18:31:54 -0700638
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800639# Alphabetically sorted list of Non standard 32 bit platforms
Yinghai Lud49c4282008-06-08 18:31:54 -0700640
Linus Torvaldsd949f362009-09-26 09:35:07 -0700641config X86_SUPPORTS_MEMORY_FAILURE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100642 def_bool y
Linus Torvaldsd949f362009-09-26 09:35:07 -0700643 # MCE code calls memory_failure():
644 depends on X86_MCE
645 # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
Linus Torvaldsd949f362009-09-26 09:35:07 -0700646 # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
647 depends on X86_64 || !SPARSEMEM
648 select ARCH_SUPPORTS_MEMORY_FAILURE
Linus Torvaldsd949f362009-09-26 09:35:07 -0700649
Alessandro Rubini83125a32012-04-04 19:40:21 +0200650config STA2X11
651 bool "STA2X11 Companion Chip Support"
652 depends on X86_32_NON_STANDARD && PCI
653 select X86_DEV_DMA_OPS
654 select X86_DMA_REMAP
655 select SWIOTLB
656 select MFD_STA2X11
Linus Walleij01450712016-06-02 14:20:18 +0200657 select GPIOLIB
Alessandro Rubini83125a32012-04-04 19:40:21 +0200658 default n
659 ---help---
660 This adds support for boards based on the STA2X11 IO-Hub,
661 a.k.a. "ConneXt". The chip is used in place of the standard
662 PC chipset, so all "standard" peripherals are missing. If this
663 option is selected the kernel will still be able to boot on
664 standard PC machines.
665
Shérab82148d12010-09-25 06:06:57 +0200666config X86_32_IRIS
667 tristate "Eurobraille/Iris poweroff module"
668 depends on X86_32
669 ---help---
670 The Iris machines from EuroBraille do not have APM or ACPI support
671 to shut themselves down properly. A special I/O sequence is
672 needed to do so, which is what this module does at
673 kernel shutdown.
674
675 This is only for Iris machines from EuroBraille.
676
677 If unused, say N.
678
Ingo Molnarae1e9132008-11-11 09:05:16 +0100679config SCHED_OMIT_FRAME_POINTER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100680 def_bool y
681 prompt "Single-depth WCHAN output"
Ken Chena87d0912008-11-06 11:10:49 -0800682 depends on X86
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100683 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100684 Calculate simpler /proc/<PID>/wchan values. If this option
685 is disabled then wchan values will recurse back to the
686 caller function. This provides more accurate wchan values,
687 at the expense of slightly more scheduling overhead.
688
689 If in doubt, say "Y".
690
Borislav Petkov6276a072013-03-04 21:20:21 +0100691menuconfig HYPERVISOR_GUEST
692 bool "Linux guest support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100693 ---help---
Borislav Petkov6276a072013-03-04 21:20:21 +0100694 Say Y here to enable options for running Linux under various hyper-
695 visors. This option enables basic hypervisor detection and platform
696 setup.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100697
Borislav Petkov6276a072013-03-04 21:20:21 +0100698 If you say N, all options in this submenu will be skipped and
699 disabled, and Linux guest support won't be built in.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100700
Borislav Petkov6276a072013-03-04 21:20:21 +0100701if HYPERVISOR_GUEST
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100702
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100703config PARAVIRT
704 bool "Enable paravirtualization code"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100705 ---help---
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100706 This changes the kernel so it can modify itself when it is run
707 under a hypervisor, potentially improving performance significantly
708 over full virtualization. However, when run without a hypervisor
709 the kernel is theoretically slower and slightly larger.
710
Borislav Petkov6276a072013-03-04 21:20:21 +0100711config PARAVIRT_DEBUG
712 bool "paravirt-ops debugging"
713 depends on PARAVIRT && DEBUG_KERNEL
714 ---help---
715 Enable to debug paravirt_ops internals. Specifically, BUG if
716 a paravirt_op is missing when it is called.
717
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700718config PARAVIRT_SPINLOCKS
719 bool "Paravirtualization layer for spinlocks"
Kees Cook6ea30382012-10-02 11:16:47 -0700720 depends on PARAVIRT && SMP
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700721 ---help---
722 Paravirtualized spinlocks allow a pvops backend to replace the
723 spinlock implementation with something virtualization-friendly
724 (for example, block the virtual CPU rather than spinning).
725
Raghavendra K T4c4e4f62013-10-21 21:35:08 +0530726 It has a minimal impact on native kernels and gives a nice performance
727 benefit on paravirtualized KVM / Xen kernels.
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700728
Raghavendra K T4c4e4f62013-10-21 21:35:08 +0530729 If you are unsure how to answer this question, answer Y.
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700730
Waiman Long45e898b2015-11-09 19:09:25 -0500731config QUEUED_LOCK_STAT
732 bool "Paravirt queued spinlock statistics"
Peter Zijlstracfd89832016-05-18 20:43:02 +0200733 depends on PARAVIRT_SPINLOCKS && DEBUG_FS
Waiman Long45e898b2015-11-09 19:09:25 -0500734 ---help---
735 Enable the collection of statistical data on the slowpath
736 behavior of paravirtualized queued spinlocks and report
737 them on debugfs.
738
Borislav Petkov6276a072013-03-04 21:20:21 +0100739source "arch/x86/xen/Kconfig"
740
741config KVM_GUEST
742 bool "KVM Guest support (including kvmclock)"
743 depends on PARAVIRT
744 select PARAVIRT_CLOCK
745 default y
746 ---help---
747 This option enables various optimizations for running under the KVM
748 hypervisor. It includes a paravirtualized clock, so that instead
749 of relying on a PIT (or probably other) emulation by the
750 underlying device model, the host provides the guest with
751 timing infrastructure such as time of day, and system time
752
Srivatsa Vaddagiri1e20eb82013-08-09 19:52:01 +0530753config KVM_DEBUG_FS
754 bool "Enable debug information for KVM Guests in debugfs"
755 depends on KVM_GUEST && DEBUG_FS
756 default n
757 ---help---
758 This option enables collection of various statistics for KVM guest.
759 Statistics are displayed in debugfs filesystem. Enabling this option
760 may incur significant overhead.
761
Borislav Petkov6276a072013-03-04 21:20:21 +0100762source "arch/x86/lguest/Kconfig"
763
764config PARAVIRT_TIME_ACCOUNTING
765 bool "Paravirtual steal time accounting"
766 depends on PARAVIRT
767 default n
768 ---help---
769 Select this option to enable fine granularity task steal time
770 accounting. Time spent executing other tasks in parallel with
771 the current vCPU is discounted from the vCPU power. To account for
772 that, there can be a small performance impact.
773
774 If in doubt, say N here.
775
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200776config PARAVIRT_CLOCK
777 bool
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200778
Borislav Petkov6276a072013-03-04 21:20:21 +0100779endif #HYPERVISOR_GUEST
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400780
Yinghai Lu08677212010-02-10 01:20:20 -0800781config NO_BOOTMEM
Yinghai Lu774ea0b2010-08-25 13:39:18 -0700782 def_bool y
Yinghai Lu08677212010-02-10 01:20:20 -0800783
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100784source "arch/x86/Kconfig.cpu"
785
786config HPET_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100787 def_bool X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100788 prompt "HPET Timer Support" if X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100789 ---help---
790 Use the IA-PC HPET (High Precision Event Timer) to manage
791 time in preference to the PIT and RTC, if a HPET is
792 present.
793 HPET is the next generation timer replacing legacy 8254s.
794 The HPET provides a stable time base on SMP
795 systems, unlike the TSC, but it is more expensive to access,
Michael S. Tsirkin4e7f9df2016-02-11 01:05:01 +0200796 as it is off-chip. The interface used is documented
797 in the HPET spec, revision 1.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100798
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100799 You can safely choose Y here. However, HPET will only be
800 activated if the platform and the BIOS support this feature.
801 Otherwise the 8254 will be used for timing services.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100802
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100803 Choose N to continue using the legacy 8254 timer.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100804
805config HPET_EMULATE_RTC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100806 def_bool y
Bernhard Walle9d8af782008-02-06 01:38:52 -0800807 depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100808
Jacob Panbb24c472009-09-02 07:37:17 -0700809config APB_TIMER
Alan Cox933b9462011-12-17 17:43:40 +0000810 def_bool y if X86_INTEL_MID
811 prompt "Intel MID APB Timer Support" if X86_INTEL_MID
Jamie Iles06c3df42011-06-06 12:43:07 +0100812 select DW_APB_TIMER
Alan Coxa0c38322011-12-17 21:57:25 +0000813 depends on X86_INTEL_MID && SFI
Jacob Panbb24c472009-09-02 07:37:17 -0700814 help
815 APB timer is the replacement for 8254, HPET on X86 MID platforms.
816 The APBT provides a stable time base on SMP
817 systems, unlike the TSC, but it is more expensive to access,
818 as it is off-chip. APB timers are always running regardless of CPU
819 C states, they are used as per CPU clockevent device when possible.
820
David Rientjes6a108a12011-01-20 14:44:16 -0800821# Mark as expert because too many people got it wrong.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100822# The code disables itself when not needed.
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700823config DMI
824 default y
Ard Biesheuvelcf074402014-01-23 15:54:39 -0800825 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
David Rientjes6a108a12011-01-20 14:44:16 -0800826 bool "Enable DMI scanning" if EXPERT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100827 ---help---
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700828 Enabled scanning of DMI to identify machine quirks. Say Y
829 here unless you have verified that your setup is not
830 affected by entries in the DMI blacklist. Required by PNP
831 BIOS code.
832
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100833config GART_IOMMU
Andi Kleen38901f12013-10-04 14:37:56 -0700834 bool "Old AMD GART IOMMU support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100835 select SWIOTLB
Andreas Herrmann23ac4ae2010-09-17 18:03:43 +0200836 depends on X86_64 && PCI && AMD_NB
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100837 ---help---
Ingo Molnarced3c422013-10-06 11:45:20 +0200838 Provides a driver for older AMD Athlon64/Opteron/Turion/Sempron
839 GART based hardware IOMMUs.
840
841 The GART supports full DMA access for devices with 32-bit access
842 limitations, on systems with more than 3 GB. This is usually needed
843 for USB, sound, many IDE/SATA chipsets and some other devices.
844
845 Newer systems typically have a modern AMD IOMMU, supported via
846 the CONFIG_AMD_IOMMU=y config option.
847
848 In normal configurations this driver is only active when needed:
849 there's more than 3 GB of memory and the system contains a
850 32-bit limited device.
851
852 If unsure, say Y.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100853
854config CALGARY_IOMMU
855 bool "IBM Calgary IOMMU support"
856 select SWIOTLB
Kees Cook6ea30382012-10-02 11:16:47 -0700857 depends on X86_64 && PCI
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100858 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100859 Support for hardware IOMMUs in IBM's xSeries x366 and x460
860 systems. Needed to run systems with more than 3GB of memory
861 properly with 32-bit PCI devices that do not support DAC
862 (Double Address Cycle). Calgary also supports bus level
863 isolation, where all DMAs pass through the IOMMU. This
864 prevents them from going anywhere except their intended
865 destination. This catches hard-to-find kernel bugs and
866 mis-behaving drivers and devices that do not use the DMA-API
867 properly to set up their DMA buffers. The IOMMU can be
868 turned off at boot time with the iommu=off parameter.
869 Normally the kernel will make the right choice by itself.
870 If unsure, say Y.
871
872config CALGARY_IOMMU_ENABLED_BY_DEFAULT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100873 def_bool y
874 prompt "Should Calgary be enabled by default?"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100875 depends on CALGARY_IOMMU
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100876 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100877 Should Calgary be enabled by default? if you choose 'y', Calgary
878 will be used (if it exists). If you choose 'n', Calgary will not be
879 used even if it exists. If you choose 'n' and would like to use
880 Calgary anyway, pass 'iommu=calgary' on the kernel command line.
881 If unsure, say Y.
882
883# need this always selected by IOMMU for the VIA workaround
884config SWIOTLB
Joerg Roedela1afd012008-11-18 12:44:21 +0100885 def_bool y if X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100886 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100887 Support for software bounce buffers used on x86-64 systems
Joe Millenbach4454d322012-09-02 17:38:20 -0700888 which don't have a hardware IOMMU. Using this PCI devices
889 which can only access 32-bits of memory can be used on systems
890 with more than 3 GB of memory.
891 If unsure, say Y.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100892
FUJITA Tomonoria8522502008-04-29 00:59:36 -0700893config IOMMU_HELPER
Jan Beulich3120e252012-09-10 12:41:45 +0100894 def_bool y
895 depends on CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700896
Mike Travis1184dc22008-05-12 21:21:12 +0200897config MAXSMP
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200898 bool "Enable Maximum number of SMP Processors and NUMA Nodes"
Kees Cook6ea30382012-10-02 11:16:47 -0700899 depends on X86_64 && SMP && DEBUG_KERNEL
Mike Travis36f51012008-12-16 17:33:51 -0800900 select CPUMASK_OFFSTACK
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100901 ---help---
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200902 Enable maximum number of CPUS and NUMA Nodes for this architecture.
Mike Travis1184dc22008-05-12 21:21:12 +0200903 If unsure, say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100904
905config NR_CPUS
Mike Travis36f51012008-12-16 17:33:51 -0800906 int "Maximum number of CPUs" if SMP && !MAXSMP
Michael K. Johnson2a3313f2009-04-21 21:44:48 -0400907 range 2 8 if SMP && X86_32 && !X86_BIGSMP
Josh Boyerbb61ccc2013-11-05 09:37:29 -0500908 range 2 512 if SMP && !MAXSMP && !CPUMASK_OFFSTACK
Josh Boyerb53b5ed2013-11-05 09:38:16 -0500909 range 2 8192 if SMP && !MAXSMP && CPUMASK_OFFSTACK && X86_64
Mike Travis78637a972008-12-16 17:34:00 -0800910 default "1" if !SMP
Josh Boyerb53b5ed2013-11-05 09:38:16 -0500911 default "8192" if MAXSMP
H. Peter Anvinb5660ba2014-02-25 12:14:06 -0800912 default "32" if SMP && X86_BIGSMP
Kirill A. Shutemovc5c19942015-05-08 13:25:45 +0300913 default "8" if SMP && X86_32
914 default "64" if SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100915 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100916 This allows you to specify the maximum number of CPUs which this
Josh Boyerbb61ccc2013-11-05 09:37:29 -0500917 kernel will support. If CPUMASK_OFFSTACK is enabled, the maximum
Kirill A. Shutemovcad14bb2015-05-08 13:25:26 +0300918 supported value is 8192, otherwise the maximum value is 512. The
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100919 minimum value which makes sense is 2.
920
921 This is purely to save memory - each supported CPU adds
922 approximately eight kilobytes to the kernel image.
923
924config SCHED_SMT
925 bool "SMT (Hyperthreading) scheduler support"
Borislav Petkovc8e56d22015-06-04 18:55:25 +0200926 depends on SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100927 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100928 SMT scheduler support improves the CPU scheduler's decision making
929 when dealing with Intel Pentium 4 chips with HyperThreading at a
930 cost of slightly increased overhead in some places. If unsure say
931 N here.
932
933config SCHED_MC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100934 def_bool y
935 prompt "Multi-core scheduler support"
Borislav Petkovc8e56d22015-06-04 18:55:25 +0200936 depends on SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100937 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100938 Multi-core scheduler support improves the CPU scheduler's decision
939 making when dealing with multi-core CPU chips at a cost of slightly
940 increased overhead in some places. If unsure say N here.
941
942source "kernel/Kconfig.preempt"
943
Thomas Gleixner30b8b002015-01-15 21:22:39 +0000944config UP_LATE_INIT
945 def_bool y
Thomas Gleixnerba360f8872015-01-24 10:34:46 +0100946 depends on !SMP && X86_LOCAL_APIC
Thomas Gleixner30b8b002015-01-15 21:22:39 +0000947
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100948config X86_UP_APIC
Jan Beulich50849ee2015-02-05 15:31:56 +0000949 bool "Local APIC support on uniprocessors" if !PCI_MSI
950 default PCI_MSI
Bryan O'Donoghue38a1dfd2015-01-22 22:58:49 +0000951 depends on X86_32 && !SMP && !X86_32_NON_STANDARD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100952 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100953 A local APIC (Advanced Programmable Interrupt Controller) is an
954 integrated interrupt controller in the CPU. If you have a single-CPU
955 system which has a processor with a local APIC, you can say Y here to
956 enable and use it. If you say Y here even though your machine doesn't
957 have a local APIC, then the kernel will still run with no slowdown at
958 all. The local APIC supports CPU-generated self-interrupts (timer,
959 performance counters), and the NMI watchdog which detects hard
960 lockups.
961
962config X86_UP_IOAPIC
963 bool "IO-APIC support on uniprocessors"
964 depends on X86_UP_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100965 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100966 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
967 SMP-capable replacement for PC-style interrupt controllers. Most
968 SMP systems and many recent uniprocessor systems have one.
969
970 If you have a single-CPU system with an IO-APIC, you can say Y here
971 to use it. If you say Y here even though your machine doesn't have
972 an IO-APIC, then the kernel will still run with no slowdown at all.
973
974config X86_LOCAL_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100975 def_bool y
Thomas Petazzoni0dbc6072013-10-03 11:59:14 +0200976 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC || PCI_MSI
Jiang Liub5dc8e62015-04-13 14:11:24 +0800977 select IRQ_DOMAIN_HIERARCHY
Jiang Liu52f518a2015-04-13 14:11:35 +0800978 select PCI_MSI_IRQ_DOMAIN if PCI_MSI
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100979
980config X86_IO_APIC
Jan Beulichb1da1e72015-02-05 15:35:21 +0000981 def_bool y
982 depends on X86_LOCAL_APIC || X86_UP_IOAPIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100983
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200984config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
985 bool "Reroute for broken boot IRQs"
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200986 depends on X86_IO_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100987 ---help---
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200988 This option enables a workaround that fixes a source of
989 spurious interrupts. This is recommended when threaded
990 interrupt handling is used on systems where the generation of
991 superfluous "boot interrupts" cannot be disabled.
992
993 Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
994 entry in the chipset's IO-APIC is masked (as, e.g. the RT
995 kernel does during interrupt handling). On chipsets where this
996 boot IRQ generation cannot be disabled, this workaround keeps
997 the original IRQ line masked so that only the equivalent "boot
998 IRQ" is delivered to the CPUs. The workaround also tells the
999 kernel to set up the IRQ handler on the boot IRQ line. In this
1000 way only one interrupt is delivered to the kernel. Otherwise
1001 the spurious second interrupt may cause the kernel to bring
1002 down (vital) interrupt lines.
1003
1004 Only affects "broken" chipsets. Interrupt sharing may be
1005 increased on these systems.
1006
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001007config X86_MCE
Andi Kleenbab9bc62009-07-09 00:31:38 +02001008 bool "Machine Check / overheating reporting"
Chen, Gong648ed942015-08-12 18:29:34 +02001009 select GENERIC_ALLOCATOR
Borislav Petkove57dbaf2011-09-13 15:23:21 +02001010 default y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001011 ---help---
Andi Kleenbab9bc62009-07-09 00:31:38 +02001012 Machine Check support allows the processor to notify the
1013 kernel if it detects a problem (e.g. overheating, data corruption).
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001014 The action the kernel takes depends on the severity of the problem,
Andi Kleenbab9bc62009-07-09 00:31:38 +02001015 ranging from warning messages to halting the machine.
Andi Kleen4efc0672009-04-28 19:07:31 +02001016
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001017config X86_MCE_INTEL
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001018 def_bool y
1019 prompt "Intel MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +02001020 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001021 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001022 Additional support for intel specific MCE features such as
1023 the thermal monitor.
1024
1025config X86_MCE_AMD
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001026 def_bool y
1027 prompt "AMD MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +02001028 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001029 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001030 Additional support for AMD specific MCE features such as
1031 the DRAM Error Threshold.
1032
Andi Kleen4efc0672009-04-28 19:07:31 +02001033config X86_ANCIENT_MCE
Jan Beulich6fc108a2010-04-21 15:23:44 +01001034 bool "Support for old Pentium 5 / WinChip machine checks"
Andi Kleenc31d9632009-07-09 00:31:37 +02001035 depends on X86_32 && X86_MCE
Hidetoshi Setocd13adcc2009-05-27 16:57:31 +09001036 ---help---
1037 Include support for machine check handling on old Pentium 5 or WinChip
Masanari Iida5065a702013-11-30 21:38:43 +09001038 systems. These typically need to be enabled explicitly on the command
Hidetoshi Setocd13adcc2009-05-27 16:57:31 +09001039 line.
Andi Kleen4efc0672009-04-28 19:07:31 +02001040
Andi Kleenb2762682009-02-12 13:49:31 +01001041config X86_MCE_THRESHOLD
1042 depends on X86_MCE_AMD || X86_MCE_INTEL
Jan Beulich6fc108a2010-04-21 15:23:44 +01001043 def_bool y
Andi Kleenb2762682009-02-12 13:49:31 +01001044
Andi Kleenea149b32009-04-29 19:31:00 +02001045config X86_MCE_INJECT
Andi Kleenc1ebf832009-07-09 00:31:41 +02001046 depends on X86_MCE
Andi Kleenea149b32009-04-29 19:31:00 +02001047 tristate "Machine check injector support"
1048 ---help---
1049 Provide support for injecting machine checks for testing purposes.
1050 If you don't know what a machine check is and you don't do kernel
1051 QA it is safe to say n.
1052
Andi Kleen4efc0672009-04-28 19:07:31 +02001053config X86_THERMAL_VECTOR
1054 def_bool y
Andi Kleen5bb38ad2009-07-09 00:31:39 +02001055 depends on X86_MCE_INTEL
Andi Kleen4efc0672009-04-28 19:07:31 +02001056
Peter Zijlstra07dc9002016-03-29 14:30:35 +02001057source "arch/x86/events/Kconfig"
Kan Liange633c652016-03-20 01:33:36 -07001058
Andy Lutomirski5aef51c2015-07-10 08:34:23 -07001059config X86_LEGACY_VM86
Ingo Molnar1e642812015-09-05 08:58:10 +02001060 bool "Legacy VM86 support"
Andy Lutomirski5aef51c2015-07-10 08:34:23 -07001061 default n
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001062 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001063 ---help---
Andy Lutomirski5aef51c2015-07-10 08:34:23 -07001064 This option allows user programs to put the CPU into V8086
1065 mode, which is an 80286-era approximation of 16-bit real mode.
1066
1067 Some very old versions of X and/or vbetool require this option
1068 for user mode setting. Similarly, DOSEMU will use it if
1069 available to accelerate real mode DOS programs. However, any
1070 recent version of DOSEMU, X, or vbetool should be fully
1071 functional even without kernel VM86 support, as they will all
Ingo Molnar1e642812015-09-05 08:58:10 +02001072 fall back to software emulation. Nevertheless, if you are using
1073 a 16-bit DOS program where 16-bit performance matters, vm86
1074 mode might be faster than emulation and you might want to
1075 enable this option.
Andy Lutomirski5aef51c2015-07-10 08:34:23 -07001076
Ingo Molnar1e642812015-09-05 08:58:10 +02001077 Note that any app that works on a 64-bit kernel is unlikely to
1078 need this option, as 64-bit kernels don't, and can't, support
1079 V8086 mode. This option is also unrelated to 16-bit protected
1080 mode and is not needed to run most 16-bit programs under Wine.
Andy Lutomirski5aef51c2015-07-10 08:34:23 -07001081
Ingo Molnar1e642812015-09-05 08:58:10 +02001082 Enabling this option increases the complexity of the kernel
1083 and slows down exception handling a tiny bit.
Andy Lutomirski5aef51c2015-07-10 08:34:23 -07001084
Ingo Molnar1e642812015-09-05 08:58:10 +02001085 If unsure, say N here.
Andy Lutomirski5aef51c2015-07-10 08:34:23 -07001086
1087config VM86
1088 bool
1089 default X86_LEGACY_VM86
H. Peter Anvin34273f42014-05-04 10:36:22 -07001090
1091config X86_16BIT
1092 bool "Enable support for 16-bit segments" if EXPERT
1093 default y
Andy Lutomirskia5b9e5a2015-07-30 14:31:34 -07001094 depends on MODIFY_LDT_SYSCALL
H. Peter Anvin34273f42014-05-04 10:36:22 -07001095 ---help---
1096 This option is required by programs like Wine to run 16-bit
1097 protected mode legacy code on x86 processors. Disabling
1098 this option saves about 300 bytes on i386, or around 6K text
1099 plus 16K runtime memory on x86-64,
1100
1101config X86_ESPFIX32
1102 def_bool y
1103 depends on X86_16BIT && X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001104
H. Peter Anvin197725d2014-05-04 10:00:49 -07001105config X86_ESPFIX64
1106 def_bool y
H. Peter Anvin34273f42014-05-04 10:36:22 -07001107 depends on X86_16BIT && X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001108
Andy Lutomirski1ad83c82014-10-29 14:33:47 -07001109config X86_VSYSCALL_EMULATION
1110 bool "Enable vsyscall emulation" if EXPERT
1111 default y
1112 depends on X86_64
1113 ---help---
1114 This enables emulation of the legacy vsyscall page. Disabling
1115 it is roughly equivalent to booting with vsyscall=none, except
1116 that it will also disable the helpful warning if a program
1117 tries to use a vsyscall. With this option set to N, offending
1118 programs will just segfault, citing addresses of the form
1119 0xffffffffff600?00.
1120
1121 This option is required by many programs built before 2013, and
1122 care should be used even with newer programs if set to N.
1123
1124 Disabling this option saves about 7K of kernel size and
1125 possibly 4K of additional runtime pagetable memory.
1126
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001127config TOSHIBA
1128 tristate "Toshiba Laptop support"
1129 depends on X86_32
1130 ---help---
1131 This adds a driver to safely access the System Management Mode of
1132 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
1133 not work on models with a Phoenix BIOS. The System Management Mode
1134 is used to set the BIOS and power saving options on Toshiba portables.
1135
1136 For information on utilities to make use of this driver see the
1137 Toshiba Linux utilities web site at:
1138 <http://www.buzzard.org.uk/toshiba/>.
1139
1140 Say Y if you intend to run this kernel on a Toshiba portable.
1141 Say N otherwise.
1142
1143config I8K
Pali Rohár039ae582015-05-14 13:16:37 +02001144 tristate "Dell i8k legacy laptop support"
Jean Delvare949a9d72011-05-25 20:43:33 +02001145 select HWMON
Pali Rohár039ae582015-05-14 13:16:37 +02001146 select SENSORS_DELL_SMM
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001147 ---help---
Pali Rohár039ae582015-05-14 13:16:37 +02001148 This option enables legacy /proc/i8k userspace interface in hwmon
1149 dell-smm-hwmon driver. Character file /proc/i8k reports bios version,
1150 temperature and allows controlling fan speeds of Dell laptops via
1151 System Management Mode. For old Dell laptops (like Dell Inspiron 8000)
1152 it reports also power and hotkey status. For fan speed control is
1153 needed userspace package i8kutils.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001154
Pali Rohár039ae582015-05-14 13:16:37 +02001155 Say Y if you intend to run this kernel on old Dell laptops or want to
1156 use userspace package i8kutils.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001157 Say N otherwise.
1158
1159config X86_REBOOTFIXUPS
Jan Beulich9ba16082008-10-15 22:01:38 -07001160 bool "Enable X86 board specific fixups for reboot"
1161 depends on X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001162 ---help---
1163 This enables chipset and/or board specific fixups to be done
1164 in order to get reboot to work correctly. This is only needed on
1165 some combinations of hardware and BIOS. The symptom, for which
1166 this config is intended, is when reboot ends with a stalled/hung
1167 system.
1168
1169 Currently, the only fixup is for the Geode machines using
Florian Fainelli5e3a77e2008-01-30 13:33:36 +01001170 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001171
1172 Say Y if you want to enable the fixup. Currently, it's safe to
1173 enable this option even if you don't need it.
1174 Say N otherwise.
1175
1176config MICROCODE
Borislav Petkov9a2bc332015-10-20 11:54:44 +02001177 bool "CPU microcode loading support"
1178 default y
Borislav Petkov80030e32013-10-13 18:36:29 +02001179 depends on CPU_SUP_AMD || CPU_SUP_INTEL
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001180 select FW_LOADER
1181 ---help---
1182 If you say Y here, you will be able to update the microcode on
Borislav Petkov5f9c01a2016-02-03 12:33:29 +01001183 Intel and AMD processors. The Intel support is for the IA32 family,
1184 e.g. Pentium Pro, Pentium II, Pentium III, Pentium 4, Xeon etc. The
1185 AMD support is for families 0x10 and later. You will obviously need
1186 the actual microcode binary data itself which is not shipped with
1187 the Linux kernel.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001188
Borislav Petkov5f9c01a2016-02-03 12:33:29 +01001189 The preferred method to load microcode from a detached initrd is described
1190 in Documentation/x86/early-microcode.txt. For that you need to enable
1191 CONFIG_BLK_DEV_INITRD in order for the loader to be able to scan the
1192 initrd for microcode blobs.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001193
Borislav Petkov5f9c01a2016-02-03 12:33:29 +01001194 In addition, you can build-in the microcode into the kernel. For that you
1195 need to enable FIRMWARE_IN_KERNEL and add the vendor-supplied microcode
1196 to the CONFIG_EXTRA_FIRMWARE config option.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001197
Peter Oruba8d86f392008-07-28 18:44:21 +02001198config MICROCODE_INTEL
Borislav Petkove43f6e62012-08-01 19:17:01 +02001199 bool "Intel microcode loading support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001200 depends on MICROCODE
1201 default MICROCODE
1202 select FW_LOADER
1203 ---help---
1204 This options enables microcode patch loading support for Intel
1205 processors.
Peter Oruba8d86f392008-07-28 18:44:21 +02001206
Alanb8989db2014-01-20 18:01:56 +00001207 For the current Intel microcode data package go to
1208 <https://downloadcenter.intel.com> and search for
1209 'Linux Processor Microcode Data File'.
Peter Oruba8d86f392008-07-28 18:44:21 +02001210
Peter Oruba80cc9f12008-07-28 18:44:22 +02001211config MICROCODE_AMD
Borislav Petkove43f6e62012-08-01 19:17:01 +02001212 bool "AMD microcode loading support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001213 depends on MICROCODE
1214 select FW_LOADER
1215 ---help---
1216 If you select this option, microcode patch loading support for AMD
1217 processors will be enabled.
Peter Oruba80cc9f12008-07-28 18:44:22 +02001218
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001219config MICROCODE_OLD_INTERFACE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001220 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001221 depends on MICROCODE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001222
1223config X86_MSR
1224 tristate "/dev/cpu/*/msr - Model-specific register support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001225 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001226 This device gives privileged processes access to the x86
1227 Model-Specific Registers (MSRs). It is a character device with
1228 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
1229 MSR accesses are directed to a specific CPU on multi-processor
1230 systems.
1231
1232config X86_CPUID
1233 tristate "/dev/cpu/*/cpuid - CPU information support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001234 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001235 This device gives processes access to the x86 CPUID instruction to
1236 be executed on a specific processor. It is a character device
1237 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
1238 /dev/cpu/31/cpuid.
1239
1240choice
1241 prompt "High Memory Support"
Jan Beulich6fc108a2010-04-21 15:23:44 +01001242 default HIGHMEM4G
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001243 depends on X86_32
1244
1245config NOHIGHMEM
1246 bool "off"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001247 ---help---
1248 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
1249 However, the address space of 32-bit x86 processors is only 4
1250 Gigabytes large. That means that, if you have a large amount of
1251 physical memory, not all of it can be "permanently mapped" by the
1252 kernel. The physical memory that's not permanently mapped is called
1253 "high memory".
1254
1255 If you are compiling a kernel which will never run on a machine with
1256 more than 1 Gigabyte total physical RAM, answer "off" here (default
1257 choice and suitable for most users). This will result in a "3GB/1GB"
1258 split: 3GB are mapped so that each process sees a 3GB virtual memory
1259 space and the remaining part of the 4GB virtual memory space is used
1260 by the kernel to permanently map as much physical memory as
1261 possible.
1262
1263 If the machine has between 1 and 4 Gigabytes physical RAM, then
1264 answer "4GB" here.
1265
1266 If more than 4 Gigabytes is used then answer "64GB" here. This
1267 selection turns Intel PAE (Physical Address Extension) mode on.
1268 PAE implements 3-level paging on IA32 processors. PAE is fully
1269 supported by Linux, PAE mode is implemented on all recent Intel
1270 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
1271 then the kernel will not boot on CPUs that don't support PAE!
1272
1273 The actual amount of total physical memory will either be
1274 auto detected or can be forced by using a kernel command line option
1275 such as "mem=256M". (Try "man bootparam" or see the documentation of
1276 your boot loader (lilo or loadlin) about how to pass options to the
1277 kernel at boot time.)
1278
1279 If unsure, say "off".
1280
1281config HIGHMEM4G
1282 bool "4GB"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001283 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001284 Select this if you have a 32-bit processor and between 1 and 4
1285 gigabytes of physical RAM.
1286
1287config HIGHMEM64G
1288 bool "64GB"
H. Peter Anvineb068e72012-11-28 11:50:23 -08001289 depends on !M486
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001290 select X86_PAE
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001291 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001292 Select this if you have a 32-bit processor and more than 4
1293 gigabytes of physical RAM.
1294
1295endchoice
1296
1297choice
David Rientjes6a108a12011-01-20 14:44:16 -08001298 prompt "Memory split" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001299 default VMSPLIT_3G
1300 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001301 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001302 Select the desired split between kernel and user memory.
1303
1304 If the address range available to the kernel is less than the
1305 physical memory installed, the remaining memory will be available
1306 as "high memory". Accessing high memory is a little more costly
1307 than low memory, as it needs to be mapped into the kernel first.
1308 Note that increasing the kernel address space limits the range
1309 available to user programs, making the address space there
1310 tighter. Selecting anything other than the default 3G/1G split
1311 will also likely make your kernel incompatible with binary-only
1312 kernel modules.
1313
1314 If you are not absolutely sure what you are doing, leave this
1315 option alone!
1316
1317 config VMSPLIT_3G
1318 bool "3G/1G user/kernel split"
1319 config VMSPLIT_3G_OPT
1320 depends on !X86_PAE
1321 bool "3G/1G user/kernel split (for full 1G low memory)"
1322 config VMSPLIT_2G
1323 bool "2G/2G user/kernel split"
1324 config VMSPLIT_2G_OPT
1325 depends on !X86_PAE
1326 bool "2G/2G user/kernel split (for full 2G low memory)"
1327 config VMSPLIT_1G
1328 bool "1G/3G user/kernel split"
1329endchoice
1330
1331config PAGE_OFFSET
1332 hex
1333 default 0xB0000000 if VMSPLIT_3G_OPT
1334 default 0x80000000 if VMSPLIT_2G
1335 default 0x78000000 if VMSPLIT_2G_OPT
1336 default 0x40000000 if VMSPLIT_1G
1337 default 0xC0000000
1338 depends on X86_32
1339
1340config HIGHMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001341 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001342 depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001343
1344config X86_PAE
Jan Beulich9ba16082008-10-15 22:01:38 -07001345 bool "PAE (Physical Address Extension) Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001346 depends on X86_32 && !HIGHMEM4G
Christian Melki9d99c712015-10-05 17:31:33 +02001347 select SWIOTLB
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001348 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001349 PAE is required for NX support, and furthermore enables
1350 larger swapspace support for non-overcommit purposes. It
1351 has the cost of more pagetable lookup overhead, and also
1352 consumes more pagetable space per process.
1353
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001354config ARCH_PHYS_ADDR_T_64BIT
Jan Beulich3120e252012-09-10 12:41:45 +01001355 def_bool y
1356 depends on X86_64 || X86_PAE
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001357
FUJITA Tomonori66f2b062010-10-20 15:55:35 -07001358config ARCH_DMA_ADDR_T_64BIT
Jan Beulich3120e252012-09-10 12:41:45 +01001359 def_bool y
1360 depends on X86_64 || HIGHMEM64G
FUJITA Tomonori66f2b062010-10-20 15:55:35 -07001361
Ingo Molnar10971ab2015-03-05 08:18:23 +01001362config X86_DIRECT_GBPAGES
Luis R. Rodrigueze5008ab2015-03-04 17:24:12 -08001363 def_bool y
1364 depends on X86_64 && !DEBUG_PAGEALLOC && !KMEMCHECK
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001365 ---help---
Ingo Molnar10971ab2015-03-05 08:18:23 +01001366 Certain kernel features effectively disable kernel
1367 linear 1 GB mappings (even if the CPU otherwise
1368 supports them), so don't confuse the user by printing
1369 that we have them enabled.
Nick Piggin9e899812008-10-22 12:33:16 +02001370
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001371# Common NUMA Features
1372config NUMA
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001373 bool "Numa Memory Allocation and Scheduler Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001374 depends on SMP
H. Peter Anvinb5660ba2014-02-25 12:14:06 -08001375 depends on X86_64 || (X86_32 && HIGHMEM64G && X86_BIGSMP)
1376 default y if X86_BIGSMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001377 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001378 Enable NUMA (Non Uniform Memory Access) support.
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001379
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001380 The kernel will try to allocate memory used by a CPU on the
1381 local memory controller of the CPU and add some more
1382 NUMA awareness to the kernel.
1383
Ingo Molnarc280ea52008-11-08 13:29:45 +01001384 For 64-bit this is recommended if the system is Intel Core i7
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001385 (or later), AMD Opteron, or EM64T NUMA.
1386
H. Peter Anvinb5660ba2014-02-25 12:14:06 -08001387 For 32-bit this is only needed if you boot a 32-bit
David Rientjes7cf6c942014-02-11 18:11:13 -08001388 kernel on a 64-bit NUMA platform.
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001389
1390 Otherwise, you should say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001391
Hans Rosenfeldeec1d4f2010-10-29 17:14:30 +02001392config AMD_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001393 def_bool y
1394 prompt "Old style AMD Opteron NUMA detection"
Tejun Heo5da0ef92011-07-11 10:34:32 +02001395 depends on X86_64 && NUMA && PCI
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001396 ---help---
Hans Rosenfeldeec1d4f2010-10-29 17:14:30 +02001397 Enable AMD NUMA node topology detection. You should say Y here if
1398 you have a multi processor AMD system. This uses an old method to
1399 read the NUMA configuration directly from the builtin Northbridge
1400 of Opteron. It is recommended to use X86_64_ACPI_NUMA instead,
1401 which also takes priority if both are compiled in.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001402
1403config X86_64_ACPI_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001404 def_bool y
1405 prompt "ACPI NUMA detection"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001406 depends on X86_64 && NUMA && ACPI && PCI
1407 select ACPI_NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001408 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001409 Enable ACPI SRAT based node topology detection.
1410
Suresh Siddha6ec6e0d2008-03-25 10:14:35 -07001411# Some NUMA nodes have memory ranges that span
1412# other nodes. Even though a pfn is valid and
1413# between a node's start and end pfns, it may not
1414# reside on that node. See memmap_init_zone()
1415# for details.
1416config NODES_SPAN_OTHER_NODES
1417 def_bool y
1418 depends on X86_64_ACPI_NUMA
1419
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001420config NUMA_EMU
1421 bool "NUMA emulation"
Tejun Heo1b7e03e2011-05-02 17:24:48 +02001422 depends on NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001423 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001424 Enable NUMA emulation. A flat machine will be split
1425 into virtual nodes when booted with "numa=fake=N", where N is the
1426 number of nodes. This is only useful for debugging.
1427
1428config NODES_SHIFT
Linus Torvaldsd25e26b2008-08-25 14:15:38 -07001429 int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
David Rientjes51591e32010-03-25 15:39:27 -07001430 range 1 10
1431 default "10" if MAXSMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001432 default "6" if X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001433 default "3"
1434 depends on NEED_MULTIPLE_NODES
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001435 ---help---
Mike Travis1184dc22008-05-12 21:21:12 +02001436 Specify the maximum number of NUMA Nodes available on the target
Matt LaPlante692105b2009-01-26 11:12:25 +01001437 system. Increases memory reserved to accommodate various tables.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001438
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001439config ARCH_HAVE_MEMORY_PRESENT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001440 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001441 depends on X86_32 && DISCONTIGMEM
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001442
1443config NEED_NODE_MEMMAP_SIZE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001444 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001445 depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001446
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001447config ARCH_FLATMEM_ENABLE
1448 def_bool y
Tejun Heo3b166512011-04-01 11:15:12 +02001449 depends on X86_32 && !NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001450
1451config ARCH_DISCONTIGMEM_ENABLE
1452 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001453 depends on NUMA && X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001454
1455config ARCH_DISCONTIGMEM_DEFAULT
1456 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001457 depends on NUMA && X86_32
1458
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001459config ARCH_SPARSEMEM_ENABLE
1460 def_bool y
Kees Cook6ea30382012-10-02 11:16:47 -07001461 depends on X86_64 || NUMA || X86_32 || X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001462 select SPARSEMEM_STATIC if X86_32
1463 select SPARSEMEM_VMEMMAP_ENABLE if X86_64
1464
Tejun Heo3b166512011-04-01 11:15:12 +02001465config ARCH_SPARSEMEM_DEFAULT
1466 def_bool y
1467 depends on X86_64
1468
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001469config ARCH_SELECT_MEMORY_MODEL
1470 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001471 depends on ARCH_SPARSEMEM_ENABLE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001472
1473config ARCH_MEMORY_PROBE
Toshi Kania0842b72013-07-19 11:47:48 -06001474 bool "Enable sysfs memory/probe interface"
Jan Beulich3120e252012-09-10 12:41:45 +01001475 depends on X86_64 && MEMORY_HOTPLUG
Toshi Kania0842b72013-07-19 11:47:48 -06001476 help
1477 This option enables a sysfs memory/probe interface for testing.
1478 See Documentation/memory-hotplug.txt for more information.
1479 If you are unsure how to answer this question, answer N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001480
Tejun Heo3b166512011-04-01 11:15:12 +02001481config ARCH_PROC_KCORE_TEXT
1482 def_bool y
1483 depends on X86_64 && PROC_KCORE
1484
Avi Kivitya29815a2010-01-10 16:28:09 +02001485config ILLEGAL_POINTER_VALUE
1486 hex
1487 default 0 if X86_32
1488 default 0xdead000000000000 if X86_64
1489
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001490source "mm/Kconfig"
1491
Dan Williams7a678322015-08-19 00:34:34 -04001492config X86_PMEM_LEGACY_DEVICE
1493 bool
1494
Christoph Hellwigec776ef2015-04-01 09:12:18 +02001495config X86_PMEM_LEGACY
Dan Williams7a678322015-08-19 00:34:34 -04001496 tristate "Support non-standard NVDIMMs and ADR protected memory"
Dan Williams9f53f9f2015-06-09 15:33:45 -04001497 depends on PHYS_ADDR_T_64BIT
1498 depends on BLK_DEV
Dan Williams7a678322015-08-19 00:34:34 -04001499 select X86_PMEM_LEGACY_DEVICE
Dan Williams9f53f9f2015-06-09 15:33:45 -04001500 select LIBNVDIMM
Christoph Hellwigec776ef2015-04-01 09:12:18 +02001501 help
1502 Treat memory marked using the non-standard e820 type of 12 as used
1503 by the Intel Sandy Bridge-EP reference BIOS as protected memory.
1504 The kernel will offer these regions to the 'pmem' driver so
1505 they can be used for persistent storage.
1506
1507 Say Y if unsure.
1508
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001509config HIGHPTE
1510 bool "Allocate 3rd-level pagetables from highmem"
Jan Beulich6fc108a2010-04-21 15:23:44 +01001511 depends on HIGHMEM
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001512 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001513 The VM uses one page table entry for each page of physical memory.
1514 For systems with a lot of RAM, this can be wasteful of precious
1515 low memory. Setting this option will put user-space page table
1516 entries in high memory.
1517
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001518config X86_CHECK_BIOS_CORRUPTION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001519 bool "Check for low memory corruption"
1520 ---help---
1521 Periodically check for memory corruption in low memory, which
1522 is suspected to be caused by BIOS. Even when enabled in the
1523 configuration, it is disabled at runtime. Enable it by
1524 setting "memory_corruption_check=1" on the kernel command
1525 line. By default it scans the low 64k of memory every 60
1526 seconds; see the memory_corruption_check_size and
1527 memory_corruption_check_period parameters in
1528 Documentation/kernel-parameters.txt to adjust this.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001529
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001530 When enabled with the default parameters, this option has
1531 almost no overhead, as it reserves a relatively small amount
1532 of memory and scans it infrequently. It both detects corruption
1533 and prevents it from affecting the running system.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001534
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001535 It is, however, intended as a diagnostic tool; if repeatable
1536 BIOS-originated corruption always affects the same memory,
1537 you can use memmap= to prevent the kernel from using that
1538 memory.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001539
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001540config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001541 bool "Set the default setting of memory_corruption_check"
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001542 depends on X86_CHECK_BIOS_CORRUPTION
1543 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001544 ---help---
1545 Set whether the default state of memory_corruption_check is
1546 on or off.
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001547
H. Peter Anvin9ea77bd2010-08-25 16:38:20 -07001548config X86_RESERVE_LOW
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001549 int "Amount of low memory, in kilobytes, to reserve for the BIOS"
1550 default 64
1551 range 4 640
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001552 ---help---
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001553 Specify the amount of low memory to reserve for the BIOS.
Ingo Molnarfc381512008-09-16 10:07:34 +02001554
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001555 The first page contains BIOS data structures that the kernel
1556 must not use, so that page must always be reserved.
Ingo Molnarfc381512008-09-16 10:07:34 +02001557
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001558 By default we reserve the first 64K of physical RAM, as a
1559 number of BIOSes are known to corrupt that memory range
1560 during events such as suspend/resume or monitor cable
1561 insertion, so it must not be used by the kernel.
Ingo Molnarfc381512008-09-16 10:07:34 +02001562
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001563 You can set this to 4 if you are absolutely sure that you
1564 trust the BIOS to get all its memory reservations and usages
1565 right. If you know your BIOS have problems beyond the
1566 default 64K area, you can set this to 640 to avoid using the
1567 entire low memory range.
1568
1569 If you have doubts about the BIOS (e.g. suspend/resume does
1570 not work or there's kernel crashes after certain hardware
1571 hotplug events) then you might want to enable
1572 X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check
1573 typical corruption patterns.
1574
1575 Leave this to the default value of 64 if you are unsure.
Ingo Molnarfc381512008-09-16 10:07:34 +02001576
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001577config MATH_EMULATION
1578 bool
Andy Lutomirskia5b9e5a2015-07-30 14:31:34 -07001579 depends on MODIFY_LDT_SYSCALL
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001580 prompt "Math emulation" if X86_32
1581 ---help---
1582 Linux can emulate a math coprocessor (used for floating point
1583 operations) if you don't have one. 486DX and Pentium processors have
1584 a math coprocessor built in, 486SX and 386 do not, unless you added
1585 a 487DX or 387, respectively. (The messages during boot time can
1586 give you some hints here ["man dmesg"].) Everyone needs either a
1587 coprocessor or this emulation.
1588
1589 If you don't have a math coprocessor, you need to say Y here; if you
1590 say Y here even though you have a coprocessor, the coprocessor will
1591 be used nevertheless. (This behavior can be changed with the kernel
1592 command line option "no387", which comes handy if your coprocessor
1593 is broken. Try "man bootparam" or see the documentation of your boot
1594 loader (lilo or loadlin) about how to pass options to the kernel at
1595 boot time.) This means that it is a good idea to say Y here if you
1596 intend to use this kernel on different machines.
1597
1598 More information about the internals of the Linux math coprocessor
1599 emulation can be found in <file:arch/x86/math-emu/README>.
1600
1601 If you are not sure, say Y; apart from resulting in a 66 KB bigger
1602 kernel, it won't hurt.
1603
1604config MTRR
Jan Beulich6fc108a2010-04-21 15:23:44 +01001605 def_bool y
David Rientjes6a108a12011-01-20 14:44:16 -08001606 prompt "MTRR (Memory Type Range Register) support" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001607 ---help---
1608 On Intel P6 family processors (Pentium Pro, Pentium II and later)
1609 the Memory Type Range Registers (MTRRs) may be used to control
1610 processor access to memory ranges. This is most useful if you have
1611 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
1612 allows bus write transfers to be combined into a larger transfer
1613 before bursting over the PCI/AGP bus. This can increase performance
1614 of image write operations 2.5 times or more. Saying Y here creates a
1615 /proc/mtrr file which may be used to manipulate your processor's
1616 MTRRs. Typically the X server should use this.
1617
1618 This code has a reasonably generic interface so that similar
1619 control registers on other processors can be easily supported
1620 as well:
1621
1622 The Cyrix 6x86, 6x86MX and M II processors have Address Range
1623 Registers (ARRs) which provide a similar functionality to MTRRs. For
1624 these, the ARRs are used to emulate the MTRRs.
1625 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
1626 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
1627 write-combining. All of these processors are supported by this code
1628 and it makes sense to say Y here if you have one of them.
1629
1630 Saying Y here also fixes a problem with buggy SMP BIOSes which only
1631 set the MTRRs for the boot CPU and not for the secondary CPUs. This
1632 can lead to all sorts of problems, so it's good to say Y here.
1633
1634 You can safely say Y even if your machine doesn't have MTRRs, you'll
1635 just add about 9 KB to your kernel.
1636
Randy Dunlap7225e752008-07-26 17:54:22 -07001637 See <file:Documentation/x86/mtrr.txt> for more information.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001638
Yinghai Lu95ffa242008-04-29 03:52:33 -07001639config MTRR_SANITIZER
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001640 def_bool y
Yinghai Lu95ffa242008-04-29 03:52:33 -07001641 prompt "MTRR cleanup support"
1642 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001643 ---help---
Thomas Gleixneraba37282008-07-15 14:48:48 +02001644 Convert MTRR layout from continuous to discrete, so X drivers can
1645 add writeback entries.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001646
Thomas Gleixneraba37282008-07-15 14:48:48 +02001647 Can be disabled with disable_mtrr_cleanup on the kernel command line.
Matt LaPlante692105b2009-01-26 11:12:25 +01001648 The largest mtrr entry size for a continuous block can be set with
Thomas Gleixneraba37282008-07-15 14:48:48 +02001649 mtrr_chunk_size.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001650
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001651 If unsure, say Y.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001652
1653config MTRR_SANITIZER_ENABLE_DEFAULT
Yinghai Luf5098d62008-04-29 20:25:58 -07001654 int "MTRR cleanup enable value (0-1)"
1655 range 0 1
1656 default "0"
Yinghai Lu95ffa242008-04-29 03:52:33 -07001657 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001658 ---help---
Yinghai Luf5098d62008-04-29 20:25:58 -07001659 Enable mtrr cleanup default value
Yinghai Lu95ffa242008-04-29 03:52:33 -07001660
Yinghai Lu12031a62008-05-02 02:40:22 -07001661config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
1662 int "MTRR cleanup spare reg num (0-7)"
1663 range 0 7
1664 default "1"
1665 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001666 ---help---
Yinghai Lu12031a62008-05-02 02:40:22 -07001667 mtrr cleanup spare entries default, it can be changed via
Thomas Gleixneraba37282008-07-15 14:48:48 +02001668 mtrr_spare_reg_nr=N on the kernel command line.
Yinghai Lu12031a62008-05-02 02:40:22 -07001669
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001670config X86_PAT
Jan Beulich6fc108a2010-04-21 15:23:44 +01001671 def_bool y
David Rientjes6a108a12011-01-20 14:44:16 -08001672 prompt "x86 PAT support" if EXPERT
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001673 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001674 ---help---
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001675 Use PAT attributes to setup page level cache control.
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001676
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001677 PATs are the modern equivalents of MTRRs and are much more
1678 flexible than MTRRs.
1679
1680 Say N here if you see bootup problems (boot crash, boot hang,
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001681 spontaneous reboots) or a non-working video driver.
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001682
1683 If unsure, say Y.
1684
Venkatesh Pallipadi46cf98c2009-07-10 09:57:37 -07001685config ARCH_USES_PG_UNCACHED
1686 def_bool y
1687 depends on X86_PAT
1688
H. Peter Anvin628c6242011-07-31 13:59:29 -07001689config ARCH_RANDOM
1690 def_bool y
1691 prompt "x86 architectural random number generator" if EXPERT
1692 ---help---
1693 Enable the x86 architectural RDRAND instruction
1694 (Intel Bull Mountain technology) to generate random numbers.
1695 If supported, this is a high bandwidth, cryptographically
1696 secure hardware random number generator.
1697
H. Peter Anvin51ae4a22012-09-21 12:43:10 -07001698config X86_SMAP
1699 def_bool y
1700 prompt "Supervisor Mode Access Prevention" if EXPERT
1701 ---help---
1702 Supervisor Mode Access Prevention (SMAP) is a security
1703 feature in newer Intel processors. There is a small
1704 performance cost if this enabled and turned on; there is
1705 also a small increase in the kernel size if this is enabled.
1706
1707 If unsure, say Y.
1708
Dave Hansen72e9b5f2014-12-12 10:38:36 -08001709config X86_INTEL_MPX
1710 prompt "Intel MPX (Memory Protection Extensions)"
1711 def_bool n
1712 depends on CPU_SUP_INTEL
1713 ---help---
1714 MPX provides hardware features that can be used in
1715 conjunction with compiler-instrumented code to check
1716 memory references. It is designed to detect buffer
1717 overflow or underflow bugs.
1718
1719 This option enables running applications which are
1720 instrumented or otherwise use MPX. It does not use MPX
1721 itself inside the kernel or to protect the kernel
1722 against bad memory references.
1723
1724 Enabling this option will make the kernel larger:
1725 ~8k of kernel text and 36 bytes of data on a 64-bit
1726 defconfig. It adds a long to the 'mm_struct' which
1727 will increase the kernel memory overhead of each
1728 process and adds some branches to paths used during
1729 exec() and munmap().
1730
1731 For details, see Documentation/x86/intel_mpx.txt
1732
1733 If unsure, say N.
1734
Dave Hansen35e97792016-02-12 13:02:00 -08001735config X86_INTEL_MEMORY_PROTECTION_KEYS
Dave Hansen284244a2016-02-12 13:02:28 -08001736 prompt "Intel Memory Protection Keys"
Dave Hansen35e97792016-02-12 13:02:00 -08001737 def_bool y
Dave Hansen284244a2016-02-12 13:02:28 -08001738 # Note: only available in 64-bit mode
Dave Hansen35e97792016-02-12 13:02:00 -08001739 depends on CPU_SUP_INTEL && X86_64
Dave Hansen284244a2016-02-12 13:02:28 -08001740 ---help---
1741 Memory Protection Keys provides a mechanism for enforcing
1742 page-based protections, but without requiring modification of the
1743 page tables when an application changes protection domains.
1744
1745 For details, see Documentation/x86/protection-keys.txt
1746
1747 If unsure, say y.
Dave Hansen35e97792016-02-12 13:02:00 -08001748
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001749config EFI
Jan Beulich9ba16082008-10-15 22:01:38 -07001750 bool "EFI runtime service support"
Huang, Ying5b836832008-01-30 13:31:19 +01001751 depends on ACPI
Sergey Vlasovf6ce5002013-04-16 18:31:08 +04001752 select UCS2_STRING
Ard Biesheuvel022ee6c2014-06-26 12:09:05 +02001753 select EFI_RUNTIME_WRAPPERS
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001754 ---help---
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001755 This enables the kernel to use EFI runtime services that are
1756 available (such as the EFI variable services).
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001757
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001758 This option is only useful on systems that have EFI firmware.
1759 In addition, you should use the latest ELILO loader available
1760 at <http://elilo.sourceforge.net> in order to take advantage
1761 of EFI runtime services. However, even with this option, the
1762 resultant kernel should continue to boot on existing non-EFI
1763 platforms.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001764
Matt Fleming291f3632011-12-12 21:27:52 +00001765config EFI_STUB
1766 bool "EFI stub support"
Matt Flemingb16d8c22014-08-05 00:12:19 +01001767 depends on EFI && !X86_USE_3DNOW
Matt Fleming7b2a5832014-07-11 08:45:25 +01001768 select RELOCATABLE
Matt Fleming291f3632011-12-12 21:27:52 +00001769 ---help---
1770 This kernel feature allows a bzImage to be loaded directly
1771 by EFI firmware without the use of a bootloader.
1772
Roy Franz4172fe22013-09-22 15:45:25 -07001773 See Documentation/efi-stub.txt for more information.
Matt Fleming0c759662012-03-16 12:03:13 +00001774
Matt Fleming7d453ee2014-01-10 18:52:06 +00001775config EFI_MIXED
1776 bool "EFI mixed-mode support"
1777 depends on EFI_STUB && X86_64
1778 ---help---
1779 Enabling this feature allows a 64-bit kernel to be booted
1780 on a 32-bit firmware, provided that your CPU supports 64-bit
1781 mode.
1782
1783 Note that it is not possible to boot a mixed-mode enabled
1784 kernel via the EFI boot stub - a bootloader that supports
1785 the EFI handover protocol must be used.
1786
1787 If unsure, say N.
1788
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001789config SECCOMP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001790 def_bool y
1791 prompt "Enable seccomp to safely compute untrusted bytecode"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001792 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001793 This kernel feature is useful for number crunching applications
1794 that may need to compute untrusted bytecode during their
1795 execution. By using pipes or other transports made available to
1796 the process as file descriptors supporting the read/write
1797 syscalls, it's possible to isolate those applications in
1798 their own address space using seccomp. Once seccomp is
Alexey Dobriyan9c0bbee2008-09-09 11:01:31 +04001799 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001800 and the task is only allowed to execute a few safe syscalls
1801 defined by each seccomp mode.
1802
1803 If unsure, say Y. Only embedded should say N here.
1804
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001805source kernel/Kconfig.hz
1806
1807config KEXEC
1808 bool "kexec system call"
Dave Young2965faa2015-09-09 15:38:55 -07001809 select KEXEC_CORE
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001810 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001811 kexec is a system call that implements the ability to shutdown your
1812 current kernel, and to start another kernel. It is like a reboot
1813 but it is independent of the system firmware. And like a reboot
1814 you can start any kernel with it, not just Linux.
1815
1816 The name comes from the similarity to the exec system call.
1817
1818 It is an ongoing process to be certain the hardware in a machine
1819 is properly shutdown, so do not be surprised if this code does not
Geert Uytterhoevenbf220692013-08-20 21:38:03 +02001820 initially work for you. As of this writing the exact hardware
1821 interface is strongly in flux, so no good recommendation can be
1822 made.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001823
Vivek Goyal74ca3172014-08-29 15:18:46 -07001824config KEXEC_FILE
1825 bool "kexec file based system call"
Dave Young2965faa2015-09-09 15:38:55 -07001826 select KEXEC_CORE
Vivek Goyal74ca3172014-08-29 15:18:46 -07001827 select BUILD_BIN2C
Vivek Goyal74ca3172014-08-29 15:18:46 -07001828 depends on X86_64
1829 depends on CRYPTO=y
1830 depends on CRYPTO_SHA256=y
1831 ---help---
1832 This is new version of kexec system call. This system call is
1833 file based and takes file descriptors as system call argument
1834 for kernel and initramfs as opposed to list of segments as
1835 accepted by previous system call.
1836
Vivek Goyal8e7d8382014-08-08 14:26:13 -07001837config KEXEC_VERIFY_SIG
1838 bool "Verify kernel signature during kexec_file_load() syscall"
Vivek Goyal74ca3172014-08-29 15:18:46 -07001839 depends on KEXEC_FILE
Vivek Goyal8e7d8382014-08-08 14:26:13 -07001840 ---help---
1841 This option makes kernel signature verification mandatory for
Borislav Petkovd8eb8942015-03-13 14:04:37 +01001842 the kexec_file_load() syscall.
Vivek Goyal8e7d8382014-08-08 14:26:13 -07001843
Borislav Petkovd8eb8942015-03-13 14:04:37 +01001844 In addition to that option, you need to enable signature
1845 verification for the corresponding kernel image type being
1846 loaded in order for this to work.
Vivek Goyal8e7d8382014-08-08 14:26:13 -07001847
1848config KEXEC_BZIMAGE_VERIFY_SIG
1849 bool "Enable bzImage signature verification support"
1850 depends on KEXEC_VERIFY_SIG
1851 depends on SIGNED_PE_FILE_VERIFICATION
1852 select SYSTEM_TRUSTED_KEYRING
1853 ---help---
1854 Enable bzImage signature verification support.
1855
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001856config CRASH_DUMP
Pavel Machek04b69442008-08-14 17:16:50 +02001857 bool "kernel crash dumps"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001858 depends on X86_64 || (X86_32 && HIGHMEM)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001859 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001860 Generate crash dump after being started by kexec.
1861 This should be normally only set in special crash dump kernels
1862 which are loaded in the main kernel with kexec-tools into
1863 a specially reserved region and then later executed after
1864 a crash by kdump/kexec. The crash dump kernel must be compiled
1865 to a memory address not used by the main kernel or BIOS using
1866 PHYSICAL_START, or it must be built as a relocatable image
1867 (CONFIG_RELOCATABLE=y).
1868 For more details see Documentation/kdump/kdump.txt
1869
Huang Ying3ab83522008-07-25 19:45:07 -07001870config KEXEC_JUMP
Kees Cook6ea30382012-10-02 11:16:47 -07001871 bool "kexec jump"
Huang Yingfee7b0d2009-03-10 10:57:16 +08001872 depends on KEXEC && HIBERNATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001873 ---help---
Huang Ying89081d12008-07-25 19:45:10 -07001874 Jump between original kernel and kexeced kernel and invoke
1875 code in physical address mode via KEXEC
Huang Ying3ab83522008-07-25 19:45:07 -07001876
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001877config PHYSICAL_START
David Rientjes6a108a12011-01-20 14:44:16 -08001878 hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP)
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001879 default "0x1000000"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001880 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001881 This gives the physical address where the kernel is loaded.
1882
1883 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
1884 bzImage will decompress itself to above physical address and
1885 run from there. Otherwise, bzImage will run from the address where
1886 it has been loaded by the boot loader and will ignore above physical
1887 address.
1888
1889 In normal kdump cases one does not have to set/change this option
1890 as now bzImage can be compiled as a completely relocatable image
1891 (CONFIG_RELOCATABLE=y) and be used to load and run from a different
1892 address. This option is mainly useful for the folks who don't want
1893 to use a bzImage for capturing the crash dump and want to use a
1894 vmlinux instead. vmlinux is not relocatable hence a kernel needs
1895 to be specifically compiled to run from a specific memory area
1896 (normally a reserved region) and this option comes handy.
1897
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001898 So if you are using bzImage for capturing the crash dump,
1899 leave the value here unchanged to 0x1000000 and set
1900 CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux
1901 for capturing the crash dump change this value to start of
1902 the reserved region. In other words, it can be set based on
1903 the "X" value as specified in the "crashkernel=YM@XM"
1904 command line boot parameter passed to the panic-ed
1905 kernel. Please take a look at Documentation/kdump/kdump.txt
1906 for more details about crash dumps.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001907
1908 Usage of bzImage for capturing the crash dump is recommended as
1909 one does not have to build two kernels. Same kernel can be used
1910 as production kernel and capture kernel. Above option should have
1911 gone away after relocatable bzImage support is introduced. But it
1912 is present because there are users out there who continue to use
1913 vmlinux for dump capture. This option should go away down the
1914 line.
1915
1916 Don't change this unless you know what you are doing.
1917
1918config RELOCATABLE
H. Peter Anvin26717802009-05-07 14:19:34 -07001919 bool "Build a relocatable kernel"
1920 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001921 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001922 This builds a kernel image that retains relocation information
1923 so it can be loaded someplace besides the default 1MB.
1924 The relocations tend to make the kernel binary about 10% larger,
1925 but are discarded at runtime.
1926
1927 One use is for the kexec on panic case where the recovery kernel
1928 must live at a different physical address than the primary
1929 kernel.
1930
1931 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
1932 it has been loaded at and the compile time physical address
Kees Cook8ab38202013-10-10 17:18:14 -07001933 (CONFIG_PHYSICAL_START) is used as the minimum location.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001934
Kees Cook8ab38202013-10-10 17:18:14 -07001935config RANDOMIZE_BASE
Baoquan Hee8581e32016-04-20 13:55:43 -07001936 bool "Randomize the address of the kernel image (KASLR)"
Kees Cook8ab38202013-10-10 17:18:14 -07001937 depends on RELOCATABLE
Kees Cook8ab38202013-10-10 17:18:14 -07001938 default n
1939 ---help---
Baoquan Hee8581e32016-04-20 13:55:43 -07001940 In support of Kernel Address Space Layout Randomization (KASLR),
1941 this randomizes the physical address at which the kernel image
1942 is decompressed and the virtual address where the kernel
1943 image is mapped, as a security feature that deters exploit
1944 attempts relying on knowledge of the location of kernel
1945 code internals.
Kees Cook8ab38202013-10-10 17:18:14 -07001946
Kees Cooked9f0072016-05-25 15:45:33 -07001947 On 64-bit, the kernel physical and virtual addresses are
1948 randomized separately. The physical address will be anywhere
1949 between 16MB and the top of physical memory (up to 64TB). The
1950 virtual address will be randomized from 16MB up to 1GB (9 bits
1951 of entropy). Note that this also reduces the memory space
1952 available to kernel modules from 1.5GB to 1GB.
1953
1954 On 32-bit, the kernel physical and virtual addresses are
1955 randomized together. They will be randomized from 16MB up to
1956 512MB (8 bits of entropy).
Kees Cook8ab38202013-10-10 17:18:14 -07001957
Baoquan Hee8581e32016-04-20 13:55:43 -07001958 Entropy is generated using the RDRAND instruction if it is
1959 supported. If RDTSC is supported, its value is mixed into
1960 the entropy pool as well. If neither RDRAND nor RDTSC are
Kees Cooked9f0072016-05-25 15:45:33 -07001961 supported, then entropy is read from the i8254 timer. The
1962 usable entropy is limited by the kernel being built using
1963 2GB addressing, and that PHYSICAL_ALIGN must be at a
1964 minimum of 2MB. As a result, only 10 bits of entropy are
1965 theoretically possible, but the implementations are further
1966 limited due to memory layouts.
Kees Cookda2b6fb2013-12-10 12:27:45 -08001967
Baoquan Hee8581e32016-04-20 13:55:43 -07001968 If CONFIG_HIBERNATE is also enabled, KASLR is disabled at boot
1969 time. To enable it, boot with "kaslr" on the kernel command
1970 line (which will also disable hibernation).
Kees Cook6145cfe2013-10-10 17:18:18 -07001971
Baoquan Hee8581e32016-04-20 13:55:43 -07001972 If unsure, say N.
Kees Cook8ab38202013-10-10 17:18:14 -07001973
1974# Relocation on x86 needs some additional build support
H. Peter Anvin845adf72009-05-05 21:20:51 -07001975config X86_NEED_RELOCS
1976 def_bool y
Kees Cook8ab38202013-10-10 17:18:14 -07001977 depends on RANDOMIZE_BASE || (X86_32 && RELOCATABLE)
H. Peter Anvin845adf72009-05-05 21:20:51 -07001978
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001979config PHYSICAL_ALIGN
Kees Cooka0215062013-07-08 09:15:17 -07001980 hex "Alignment value to which kernel should be aligned"
Kees Cook8ab38202013-10-10 17:18:14 -07001981 default "0x200000"
Kees Cooka0215062013-07-08 09:15:17 -07001982 range 0x2000 0x1000000 if X86_32
1983 range 0x200000 0x1000000 if X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001984 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001985 This value puts the alignment restrictions on physical address
1986 where kernel is loaded and run from. Kernel is compiled for an
1987 address which meets above alignment restriction.
1988
1989 If bootloader loads the kernel at a non-aligned address and
1990 CONFIG_RELOCATABLE is set, kernel will move itself to nearest
1991 address aligned to above value and run from there.
1992
1993 If bootloader loads the kernel at a non-aligned address and
1994 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
1995 load address and decompress itself to the address it has been
1996 compiled for and run from there. The address for which kernel is
1997 compiled already meets above alignment restrictions. Hence the
1998 end result is that kernel runs from a physical address meeting
1999 above alignment restrictions.
2000
Kees Cooka0215062013-07-08 09:15:17 -07002001 On 32-bit this value must be a multiple of 0x2000. On 64-bit
2002 this value must be a multiple of 0x200000.
2003
Sam Ravnborg506f1d02007-11-09 21:56:54 +01002004 Don't change this unless you know what you are doing.
2005
Thomas Garnier0483e1f2016-06-21 17:47:02 -07002006config RANDOMIZE_MEMORY
2007 bool "Randomize the kernel memory sections"
2008 depends on X86_64
2009 depends on RANDOMIZE_BASE
2010 default RANDOMIZE_BASE
2011 ---help---
2012 Randomizes the base virtual address of kernel memory sections
2013 (physical memory mapping, vmalloc & vmemmap). This security feature
2014 makes exploits relying on predictable memory locations less reliable.
2015
2016 The order of allocations remains unchanged. Entropy is generated in
2017 the same way as RANDOMIZE_BASE. Current implementation in the optimal
2018 configuration have in average 30,000 different possible virtual
2019 addresses for each memory section.
2020
2021 If unsure, say N.
2022
Thomas Garnier90397a42016-06-21 17:47:06 -07002023config RANDOMIZE_MEMORY_PHYSICAL_PADDING
2024 hex "Physical memory mapping padding" if EXPERT
2025 depends on RANDOMIZE_MEMORY
2026 default "0xa" if MEMORY_HOTPLUG
2027 default "0x0"
2028 range 0x1 0x40 if MEMORY_HOTPLUG
2029 range 0x0 0x40
2030 ---help---
2031 Define the padding in terabytes added to the existing physical
2032 memory size during kernel memory randomization. It is useful
2033 for memory hotplug support but reduces the entropy available for
2034 address randomization.
2035
2036 If unsure, leave at the default value.
2037
Sam Ravnborg506f1d02007-11-09 21:56:54 +01002038config HOTPLUG_CPU
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05002039 bool "Support for hot-pluggable CPUs"
Stephen Rothwell40b31362013-05-21 13:49:35 +10002040 depends on SMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +01002041 ---help---
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05002042 Say Y here to allow turning CPUs off and on. CPUs can be
2043 controlled through /sys/devices/system/cpu.
2044 ( Note: power management support will enable this option
2045 automatically on SMP systems. )
2046 Say N if you want to disable CPU hotplug.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01002047
Fenghua Yu80aa1df2012-11-13 11:32:39 -08002048config BOOTPARAM_HOTPLUG_CPU0
2049 bool "Set default setting of cpu0_hotpluggable"
2050 default n
Kees Cook2c922cd2013-01-22 13:01:19 -08002051 depends on HOTPLUG_CPU
Fenghua Yu80aa1df2012-11-13 11:32:39 -08002052 ---help---
2053 Set whether default state of cpu0_hotpluggable is on or off.
2054
2055 Say Y here to enable CPU0 hotplug by default. If this switch
2056 is turned on, there is no need to give cpu0_hotplug kernel
2057 parameter and the CPU0 hotplug feature is enabled by default.
2058
2059 Please note: there are two known CPU0 dependencies if you want
2060 to enable the CPU0 hotplug feature either by this switch or by
2061 cpu0_hotplug kernel parameter.
2062
2063 First, resume from hibernate or suspend always starts from CPU0.
2064 So hibernate and suspend are prevented if CPU0 is offline.
2065
2066 Second dependency is PIC interrupts always go to CPU0. CPU0 can not
2067 offline if any interrupt can not migrate out of CPU0. There may
2068 be other CPU0 dependencies.
2069
2070 Please make sure the dependencies are under your control before
2071 you enable this feature.
2072
2073 Say N if you don't want to enable CPU0 hotplug feature by default.
2074 You still can enable the CPU0 hotplug feature at boot by kernel
2075 parameter cpu0_hotplug.
2076
Fenghua Yua71c8bc2012-11-13 11:32:51 -08002077config DEBUG_HOTPLUG_CPU0
2078 def_bool n
2079 prompt "Debug CPU0 hotplug"
Kees Cook2c922cd2013-01-22 13:01:19 -08002080 depends on HOTPLUG_CPU
Fenghua Yua71c8bc2012-11-13 11:32:51 -08002081 ---help---
2082 Enabling this option offlines CPU0 (if CPU0 can be offlined) as
2083 soon as possible and boots up userspace with CPU0 offlined. User
2084 can online CPU0 back after boot time.
2085
2086 To debug CPU0 hotplug, you need to enable CPU0 offline/online
2087 feature by either turning on CONFIG_BOOTPARAM_HOTPLUG_CPU0 during
2088 compilation or giving cpu0_hotplug kernel parameter at boot.
2089
2090 If unsure, say N.
2091
Sam Ravnborg506f1d02007-11-09 21:56:54 +01002092config COMPAT_VDSO
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07002093 def_bool n
2094 prompt "Disable the 32-bit vDSO (needed for glibc 2.3.3)"
Roland McGrathaf65d642008-01-30 13:30:43 +01002095 depends on X86_32 || IA32_EMULATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002096 ---help---
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07002097 Certain buggy versions of glibc will crash if they are
2098 presented with a 32-bit vDSO that is not mapped at the address
2099 indicated in its segment table.
Randy Dunlape84446d2009-11-10 15:46:52 -08002100
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07002101 The bug was introduced by f866314b89d56845f55e6f365e18b31ec978ec3a
2102 and fixed by 3b3ddb4f7db98ec9e912ccdf54d35df4aa30e04a and
2103 49ad572a70b8aeb91e57483a11dd1b77e31c4468. Glibc 2.3.3 is
2104 the only released version with the bug, but OpenSUSE 9
2105 contains a buggy "glibc 2.3.2".
Sam Ravnborg506f1d02007-11-09 21:56:54 +01002106
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07002107 The symptom of the bug is that everything crashes on startup, saying:
2108 dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed!
2109
2110 Saying Y here changes the default value of the vdso32 boot
2111 option from 1 to 0, which turns off the 32-bit vDSO entirely.
2112 This works around the glibc bug but hurts performance.
2113
2114 If unsure, say N: if you are compiling your own kernel, you
2115 are unlikely to be using a buggy version of glibc.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01002116
Kees Cook3dc33bd2015-08-12 17:55:19 -07002117choice
2118 prompt "vsyscall table for legacy applications"
2119 depends on X86_64
2120 default LEGACY_VSYSCALL_EMULATE
2121 help
2122 Legacy user code that does not know how to find the vDSO expects
2123 to be able to issue three syscalls by calling fixed addresses in
2124 kernel space. Since this location is not randomized with ASLR,
2125 it can be used to assist security vulnerability exploitation.
2126
2127 This setting can be changed at boot time via the kernel command
2128 line parameter vsyscall=[native|emulate|none].
2129
2130 On a system with recent enough glibc (2.14 or newer) and no
2131 static binaries, you can say None without a performance penalty
2132 to improve security.
2133
2134 If unsure, select "Emulate".
2135
2136 config LEGACY_VSYSCALL_NATIVE
2137 bool "Native"
2138 help
2139 Actual executable code is located in the fixed vsyscall
2140 address mapping, implementing time() efficiently. Since
2141 this makes the mapping executable, it can be used during
2142 security vulnerability exploitation (traditionally as
2143 ROP gadgets). This configuration is not recommended.
2144
2145 config LEGACY_VSYSCALL_EMULATE
2146 bool "Emulate"
2147 help
2148 The kernel traps and emulates calls into the fixed
2149 vsyscall address mapping. This makes the mapping
2150 non-executable, but it still contains known contents,
2151 which could be used in certain rare security vulnerability
2152 exploits. This configuration is recommended when userspace
2153 still uses the vsyscall area.
2154
2155 config LEGACY_VSYSCALL_NONE
2156 bool "None"
2157 help
2158 There will be no vsyscall mapping at all. This will
2159 eliminate any risk of ASLR bypass due to the vsyscall
2160 fixed address mapping. Attempts to use the vsyscalls
2161 will be reported to dmesg, so that either old or
2162 malicious userspace programs can be identified.
2163
2164endchoice
2165
Tim Bird516cbf32008-08-12 12:52:36 -07002166config CMDLINE_BOOL
2167 bool "Built-in kernel command line"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002168 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07002169 Allow for specifying boot arguments to the kernel at
2170 build time. On some systems (e.g. embedded ones), it is
2171 necessary or convenient to provide some or all of the
2172 kernel boot arguments with the kernel itself (that is,
2173 to not rely on the boot loader to provide them.)
2174
2175 To compile command line arguments into the kernel,
2176 set this option to 'Y', then fill in the
Sébastien Hinderer69711ca2015-07-08 00:02:01 +02002177 boot arguments in CONFIG_CMDLINE.
Tim Bird516cbf32008-08-12 12:52:36 -07002178
2179 Systems with fully functional boot loaders (i.e. non-embedded)
2180 should leave this option set to 'N'.
2181
2182config CMDLINE
2183 string "Built-in kernel command string"
2184 depends on CMDLINE_BOOL
2185 default ""
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002186 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07002187 Enter arguments here that should be compiled into the kernel
2188 image and used at boot time. If the boot loader provides a
2189 command line at boot time, it is appended to this string to
2190 form the full kernel command line, when the system boots.
2191
2192 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
2193 change this behavior.
2194
2195 In most cases, the command line (whether built-in or provided
2196 by the boot loader) should specify the device for the root
2197 file system.
2198
2199config CMDLINE_OVERRIDE
2200 bool "Built-in command line overrides boot loader arguments"
Tim Bird516cbf32008-08-12 12:52:36 -07002201 depends on CMDLINE_BOOL
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002202 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07002203 Set this option to 'Y' to have the kernel ignore the boot loader
2204 command line, and use ONLY the built-in command line.
2205
2206 This is used to work around broken boot loaders. This should
2207 be set to 'N' under normal conditions.
2208
Andy Lutomirskia5b9e5a2015-07-30 14:31:34 -07002209config MODIFY_LDT_SYSCALL
2210 bool "Enable the LDT (local descriptor table)" if EXPERT
2211 default y
2212 ---help---
2213 Linux can allow user programs to install a per-process x86
2214 Local Descriptor Table (LDT) using the modify_ldt(2) system
2215 call. This is required to run 16-bit or segmented code such as
2216 DOSEMU or some Wine programs. It is also used by some very old
2217 threading libraries.
2218
2219 Enabling this feature adds a small amount of overhead to
2220 context switches and increases the low-level kernel attack
2221 surface. Disabling it removes the modify_ldt(2) system call.
2222
2223 Saying 'N' here may make sense for embedded or server kernels.
2224
Seth Jenningsb700e7f2014-12-16 11:58:19 -06002225source "kernel/livepatch/Kconfig"
2226
Sam Ravnborg506f1d02007-11-09 21:56:54 +01002227endmenu
2228
2229config ARCH_ENABLE_MEMORY_HOTPLUG
2230 def_bool y
2231 depends on X86_64 || (X86_32 && HIGHMEM)
2232
Gary Hade35551052008-10-31 10:52:03 -07002233config ARCH_ENABLE_MEMORY_HOTREMOVE
2234 def_bool y
2235 depends on MEMORY_HOTPLUG
2236
Lee Schermerhorne534c7c2010-05-26 14:44:58 -07002237config USE_PERCPU_NUMA_NODE_ID
Tejun Heo645a7912011-01-23 14:37:40 +01002238 def_bool y
Lee Schermerhorne534c7c2010-05-26 14:44:58 -07002239 depends on NUMA
2240
Kirill A. Shutemov94918462013-11-14 14:31:10 -08002241config ARCH_ENABLE_SPLIT_PMD_PTLOCK
2242 def_bool y
2243 depends on X86_64 || X86_PAE
2244
Naoya Horiguchic177c812014-06-04 16:05:35 -07002245config ARCH_ENABLE_HUGEPAGE_MIGRATION
2246 def_bool y
2247 depends on X86_64 && HUGETLB_PAGE && MIGRATION
2248
Bjorn Helgaasda85f862008-11-05 13:37:27 -06002249menu "Power management and ACPI options"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002250
2251config ARCH_HIBERNATION_HEADER
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002252 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002253 depends on X86_64 && HIBERNATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002254
2255source "kernel/power/Kconfig"
2256
2257source "drivers/acpi/Kconfig"
2258
Feng Tangefafc8b2009-08-14 15:23:29 -04002259source "drivers/sfi/Kconfig"
2260
Andi Kleena6b68072008-01-30 13:32:49 +01002261config X86_APM_BOOT
Jan Beulich6fc108a2010-04-21 15:23:44 +01002262 def_bool y
Paul Bolle282e5aa2011-11-17 11:41:31 +01002263 depends on APM
Andi Kleena6b68072008-01-30 13:32:49 +01002264
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002265menuconfig APM
2266 tristate "APM (Advanced Power Management) BIOS support"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02002267 depends on X86_32 && PM_SLEEP
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002268 ---help---
2269 APM is a BIOS specification for saving power using several different
2270 techniques. This is mostly useful for battery powered laptops with
2271 APM compliant BIOSes. If you say Y here, the system time will be
2272 reset after a RESUME operation, the /proc/apm device will provide
2273 battery status information, and user-space programs will receive
2274 notification of APM "events" (e.g. battery status change).
2275
2276 If you select "Y" here, you can disable actual use of the APM
2277 BIOS by passing the "apm=off" option to the kernel at boot time.
2278
2279 Note that the APM support is almost completely disabled for
2280 machines with more than one CPU.
2281
2282 In order to use APM, you will need supporting software. For location
Michael Witten2dc98fd2011-07-08 21:11:16 +00002283 and more information, read <file:Documentation/power/apm-acpi.txt>
2284 and the Battery Powered Linux mini-HOWTO, available from
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002285 <http://www.tldp.org/docs.html#howto>.
2286
2287 This driver does not spin down disk drives (see the hdparm(8)
2288 manpage ("man 8 hdparm") for that), and it doesn't turn off
2289 VESA-compliant "green" monitors.
2290
2291 This driver does not support the TI 4000M TravelMate and the ACER
2292 486/DX4/75 because they don't have compliant BIOSes. Many "green"
2293 desktop machines also don't have compliant BIOSes, and this driver
2294 may cause those machines to panic during the boot phase.
2295
2296 Generally, if you don't have a battery in your machine, there isn't
2297 much point in using this driver and you should say N. If you get
2298 random kernel OOPSes or reboots that don't seem to be related to
2299 anything, try disabling/enabling this option (or disabling/enabling
2300 APM in your BIOS).
2301
2302 Some other things you should try when experiencing seemingly random,
2303 "weird" problems:
2304
2305 1) make sure that you have enough swap space and that it is
2306 enabled.
2307 2) pass the "no-hlt" option to the kernel
2308 3) switch on floating point emulation in the kernel and pass
2309 the "no387" option to the kernel
2310 4) pass the "floppy=nodma" option to the kernel
2311 5) pass the "mem=4M" option to the kernel (thereby disabling
2312 all but the first 4 MB of RAM)
2313 6) make sure that the CPU is not over clocked.
2314 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
2315 8) disable the cache from your BIOS settings
2316 9) install a fan for the video card or exchange video RAM
2317 10) install a better fan for the CPU
2318 11) exchange RAM chips
2319 12) exchange the motherboard.
2320
2321 To compile this driver as a module, choose M here: the
2322 module will be called apm.
2323
2324if APM
2325
2326config APM_IGNORE_USER_SUSPEND
2327 bool "Ignore USER SUSPEND"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002328 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002329 This option will ignore USER SUSPEND requests. On machines with a
2330 compliant APM BIOS, you want to say N. However, on the NEC Versa M
2331 series notebooks, it is necessary to say Y because of a BIOS bug.
2332
2333config APM_DO_ENABLE
2334 bool "Enable PM at boot time"
2335 ---help---
2336 Enable APM features at boot time. From page 36 of the APM BIOS
2337 specification: "When disabled, the APM BIOS does not automatically
2338 power manage devices, enter the Standby State, enter the Suspend
2339 State, or take power saving steps in response to CPU Idle calls."
2340 This driver will make CPU Idle calls when Linux is idle (unless this
2341 feature is turned off -- see "Do CPU IDLE calls", below). This
2342 should always save battery power, but more complicated APM features
2343 will be dependent on your BIOS implementation. You may need to turn
2344 this option off if your computer hangs at boot time when using APM
2345 support, or if it beeps continuously instead of suspending. Turn
2346 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
2347 T400CDT. This is off by default since most machines do fine without
2348 this feature.
2349
2350config APM_CPU_IDLE
Len Browndd8af072013-02-09 21:10:04 -05002351 depends on CPU_IDLE
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002352 bool "Make CPU Idle calls when idle"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002353 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002354 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
2355 On some machines, this can activate improved power savings, such as
2356 a slowed CPU clock rate, when the machine is idle. These idle calls
2357 are made after the idle loop has run for some length of time (e.g.,
2358 333 mS). On some machines, this will cause a hang at boot time or
2359 whenever the CPU becomes idle. (On machines with more than one CPU,
2360 this option does nothing.)
2361
2362config APM_DISPLAY_BLANK
2363 bool "Enable console blanking using APM"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002364 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002365 Enable console blanking using the APM. Some laptops can use this to
2366 turn off the LCD backlight when the screen blanker of the Linux
2367 virtual console blanks the screen. Note that this is only used by
2368 the virtual console screen blanker, and won't turn off the backlight
2369 when using the X Window system. This also doesn't have anything to
2370 do with your VESA-compliant power-saving monitor. Further, this
2371 option doesn't work for all laptops -- it might not turn off your
2372 backlight at all, or it might print a lot of errors to the console,
2373 especially if you are using gpm.
2374
2375config APM_ALLOW_INTS
2376 bool "Allow interrupts during APM BIOS calls"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002377 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002378 Normally we disable external interrupts while we are making calls to
2379 the APM BIOS as a measure to lessen the effects of a badly behaving
2380 BIOS implementation. The BIOS should reenable interrupts if it
2381 needs to. Unfortunately, some BIOSes do not -- especially those in
2382 many of the newer IBM Thinkpads. If you experience hangs when you
2383 suspend, try setting this to Y. Otherwise, say N.
2384
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002385endif # APM
2386
Dave Jonesbb0a56e2011-05-19 18:51:07 -04002387source "drivers/cpufreq/Kconfig"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002388
2389source "drivers/cpuidle/Kconfig"
2390
Andy Henroid27471fd2008-10-09 11:45:22 -07002391source "drivers/idle/Kconfig"
2392
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002393endmenu
2394
2395
2396menu "Bus options (PCI etc.)"
2397
2398config PCI
Ingo Molnar1ac97012008-05-19 14:10:14 +02002399 bool "PCI support"
Adrian Bunk1c858082008-01-30 13:32:32 +01002400 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002401 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002402 Find out whether you have a PCI motherboard. PCI is the name of a
2403 bus system, i.e. the way the CPU talks to the other stuff inside
2404 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
2405 VESA. If you have PCI, say Y, otherwise N.
2406
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002407choice
2408 prompt "PCI access mode"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02002409 depends on X86_32 && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002410 default PCI_GOANY
2411 ---help---
2412 On PCI systems, the BIOS can be used to detect the PCI devices and
2413 determine their configuration. However, some old PCI motherboards
2414 have BIOS bugs and may crash if this is done. Also, some embedded
2415 PCI-based systems don't have any BIOS at all. Linux can also try to
2416 detect the PCI hardware directly without using the BIOS.
2417
2418 With this option, you can specify how Linux should detect the
2419 PCI devices. If you choose "BIOS", the BIOS will be used,
2420 if you choose "Direct", the BIOS won't be used, and if you
2421 choose "MMConfig", then PCI Express MMCONFIG will be used.
2422 If you choose "Any", the kernel will try MMCONFIG, then the
2423 direct access method and falls back to the BIOS if that doesn't
2424 work. If unsure, go with the default, which is "Any".
2425
2426config PCI_GOBIOS
2427 bool "BIOS"
2428
2429config PCI_GOMMCONFIG
2430 bool "MMConfig"
2431
2432config PCI_GODIRECT
2433 bool "Direct"
2434
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002435config PCI_GOOLPC
Daniel Drake76fb6572010-09-23 17:28:04 +01002436 bool "OLPC XO-1"
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002437 depends on OLPC
2438
Andres Salomon2bdd1b02008-06-05 14:14:41 -07002439config PCI_GOANY
2440 bool "Any"
2441
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002442endchoice
2443
2444config PCI_BIOS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002445 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02002446 depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002447
2448# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
2449config PCI_DIRECT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002450 def_bool y
Shaohua Li0aba4962011-05-27 14:59:39 +08002451 depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC || PCI_GOMMCONFIG))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002452
2453config PCI_MMCONFIG
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002454 def_bool y
Feng Tang5f0db7a2009-08-14 15:37:50 -04002455 depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002456
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002457config PCI_OLPC
Andres Salomon2bdd1b02008-06-05 14:14:41 -07002458 def_bool y
2459 depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002460
Alex Nixonb5401a92010-03-18 16:31:34 -04002461config PCI_XEN
2462 def_bool y
2463 depends on PCI && XEN
2464 select SWIOTLB_XEN
2465
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002466config PCI_DOMAINS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002467 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002468 depends on PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002469
2470config PCI_MMCONFIG
2471 bool "Support mmconfig PCI config space access"
2472 depends on X86_64 && PCI && ACPI
2473
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07002474config PCI_CNB20LE_QUIRK
David Rientjes6a108a12011-01-20 14:44:16 -08002475 bool "Read CNB20LE Host Bridge Windows" if EXPERT
Kees Cook6ea30382012-10-02 11:16:47 -07002476 depends on PCI
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07002477 help
2478 Read the PCI windows out of the CNB20LE host bridge. This allows
2479 PCI hotplug to work on systems with the CNB20LE chipset which do
2480 not have ACPI.
2481
Bjorn Helgaas64a5fed2011-01-06 10:12:30 -07002482 There's no public spec for this chipset, and this functionality
2483 is known to be incomplete.
2484
2485 You should say N unless you know you need this.
2486
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002487source "drivers/pci/Kconfig"
2488
William Breathitt Gray3a495512016-05-27 18:08:27 -04002489config ISA_BUS
2490 bool "ISA-style bus support on modern systems" if EXPERT
2491 select ISA_BUS_API
2492 help
2493 Enables ISA-style drivers on modern systems. This is necessary to
2494 support PC/104 devices on X86_64 platforms.
2495
2496 If unsure, say N.
2497
David Rientjes1c00f012011-03-22 16:34:59 -07002498# x86_64 have no ISA slots, but can have ISA-style DMA.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002499config ISA_DMA_API
David Rientjes1c00f012011-03-22 16:34:59 -07002500 bool "ISA-style DMA support" if (X86_64 && EXPERT)
2501 default y
2502 help
2503 Enables ISA-style DMA support for devices requiring such controllers.
2504 If unsure, say Y.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002505
Linus Torvalds51e68d02016-05-21 10:25:19 -07002506if X86_32
2507
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002508config ISA
2509 bool "ISA support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002510 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002511 Find out whether you have ISA slots on your motherboard. ISA is the
2512 name of a bus system, i.e. the way the CPU talks to the other stuff
2513 inside your box. Other bus systems are PCI, EISA, MicroChannel
2514 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
2515 newer boards don't support it. If you have ISA, say Y, otherwise N.
2516
2517config EISA
2518 bool "EISA support"
2519 depends on ISA
2520 ---help---
2521 The Extended Industry Standard Architecture (EISA) bus was
2522 developed as an open alternative to the IBM MicroChannel bus.
2523
2524 The EISA bus provided some of the features of the IBM MicroChannel
2525 bus while maintaining backward compatibility with cards made for
2526 the older ISA bus. The EISA bus saw limited use between 1988 and
2527 1995 when it was made obsolete by the PCI bus.
2528
2529 Say Y here if you are building a kernel for an EISA-based machine.
2530
2531 Otherwise, say N.
2532
2533source "drivers/eisa/Kconfig"
2534
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002535config SCx200
2536 tristate "NatSemi SCx200 support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002537 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002538 This provides basic support for National Semiconductor's
2539 (now AMD's) Geode processors. The driver probes for the
2540 PCI-IDs of several on-chip devices, so its a good dependency
2541 for other scx200_* drivers.
2542
2543 If compiled as a module, the driver is named scx200.
2544
2545config SCx200HR_TIMER
2546 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
John Stultz592913e2010-07-13 17:56:20 -07002547 depends on SCx200
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002548 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002549 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002550 This driver provides a clocksource built upon the on-chip
2551 27MHz high-resolution timer. Its also a workaround for
2552 NSC Geode SC-1100's buggy TSC, which loses time when the
2553 processor goes idle (as is done by the scheduler). The
2554 other workaround is idle=poll boot option.
2555
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002556config OLPC
2557 bool "One Laptop Per Child support"
Thomas Gleixner54008972011-02-23 09:50:15 +01002558 depends on !X86_PAE
Andres Salomon3c554942009-12-14 18:00:36 -08002559 select GPIOLIB
Thomas Gleixnerdc3119e72011-02-23 10:08:31 +01002560 select OF
Daniel Drake45bb1672011-03-13 15:10:17 +00002561 select OF_PROMTREE
Grant Likelyb4e51852011-12-16 15:50:17 -07002562 select IRQ_DOMAIN
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002563 ---help---
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002564 Add support for detecting the unique features of the OLPC
2565 XO hardware.
2566
Daniel Drakea3128582011-06-25 17:34:10 +01002567config OLPC_XO1_PM
2568 bool "OLPC XO-1 Power Management"
Daniel Drake97c4cb72011-06-25 17:34:11 +01002569 depends on OLPC && MFD_CS5535 && PM_SLEEP
Daniel Drakea3128582011-06-25 17:34:10 +01002570 select MFD_CORE
Daniel Drakebf1ebf02010-10-10 10:40:32 +01002571 ---help---
Daniel Drake97c4cb72011-06-25 17:34:11 +01002572 Add support for poweroff and suspend of the OLPC XO-1 laptop.
Daniel Drakebf1ebf02010-10-10 10:40:32 +01002573
Daniel Drakecfee9592011-06-25 17:34:17 +01002574config OLPC_XO1_RTC
2575 bool "OLPC XO-1 Real Time Clock"
2576 depends on OLPC_XO1_PM && RTC_DRV_CMOS
2577 ---help---
2578 Add support for the XO-1 real time clock, which can be used as a
2579 programmable wakeup source.
2580
Daniel Drake7feda8e2011-06-25 17:34:12 +01002581config OLPC_XO1_SCI
2582 bool "OLPC XO-1 SCI extras"
Daniel Draked8d01a62011-07-24 18:33:21 +01002583 depends on OLPC && OLPC_XO1_PM
Randy Dunlaped8e47f2012-12-18 12:22:17 -08002584 depends on INPUT=y
Daniel Draked8d01a62011-07-24 18:33:21 +01002585 select POWER_SUPPLY
Daniel Drake7feda8e2011-06-25 17:34:12 +01002586 select GPIO_CS5535
2587 select MFD_CORE
2588 ---help---
2589 Add support for SCI-based features of the OLPC XO-1 laptop:
Daniel Drake7bc74b32011-06-25 17:34:14 +01002590 - EC-driven system wakeups
Daniel Drake7feda8e2011-06-25 17:34:12 +01002591 - Power button
Daniel Drake7bc74b32011-06-25 17:34:14 +01002592 - Ebook switch
Daniel Drake2cf2bae2011-06-25 17:34:15 +01002593 - Lid switch
Daniel Drakee1040ac2011-06-25 17:34:16 +01002594 - AC adapter status updates
2595 - Battery status updates
Daniel Drake7feda8e2011-06-25 17:34:12 +01002596
Daniel Drakea0f30f52011-06-25 17:34:18 +01002597config OLPC_XO15_SCI
2598 bool "OLPC XO-1.5 SCI extras"
Daniel Draked8d01a62011-07-24 18:33:21 +01002599 depends on OLPC && ACPI
2600 select POWER_SUPPLY
Daniel Drakea0f30f52011-06-25 17:34:18 +01002601 ---help---
2602 Add support for SCI-based features of the OLPC XO-1.5 laptop:
2603 - EC-driven system wakeups
2604 - AC adapter status updates
2605 - Battery status updates
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002606
Ed Wildgoosed4f3e352011-09-20 14:00:12 -07002607config ALIX
2608 bool "PCEngines ALIX System Support (LED setup)"
2609 select GPIOLIB
2610 ---help---
2611 This option enables system support for the PCEngines ALIX.
2612 At present this just sets up LEDs for GPIO control on
2613 ALIX2/3/6 boards. However, other system specific setup should
2614 get added here.
2615
2616 Note: You must still enable the drivers for GPIO and LED support
2617 (GPIO_CS5535 & LEDS_GPIO) to actually use the LEDs
2618
2619 Note: You have to set alix.force=1 for boards with Award BIOS.
2620
Philip Prindevilleda4e3302012-03-05 15:05:15 -08002621config NET5501
2622 bool "Soekris Engineering net5501 System Support (LEDS, GPIO, etc)"
2623 select GPIOLIB
2624 ---help---
2625 This option enables system support for the Soekris Engineering net5501.
2626
Philip A. Prindeville31970592012-01-14 01:45:39 -07002627config GEOS
2628 bool "Traverse Technologies GEOS System Support (LEDS, GPIO, etc)"
2629 select GPIOLIB
2630 depends on DMI
2631 ---help---
2632 This option enables system support for the Traverse Technologies GEOS.
2633
Vivien Didelot7d029122013-01-04 16:18:14 -05002634config TS5500
2635 bool "Technologic Systems TS-5500 platform support"
2636 depends on MELAN
2637 select CHECK_SIGNATURE
2638 select NEW_LEDS
2639 select LEDS_CLASS
2640 ---help---
2641 This option enables system support for the Technologic Systems TS-5500.
2642
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002643endif # X86_32
2644
Andreas Herrmann23ac4ae2010-09-17 18:03:43 +02002645config AMD_NB
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002646 def_bool y
Borislav Petkov0e152cd2010-03-12 15:43:03 +01002647 depends on CPU_SUP_AMD && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002648
2649source "drivers/pcmcia/Kconfig"
2650
Alexandre Bounine388b78a2011-03-23 16:43:03 -07002651config RAPIDIO
Alexandre Bouninefdf90ab2013-07-03 15:08:56 -07002652 tristate "RapidIO support"
Alexandre Bounine388b78a2011-03-23 16:43:03 -07002653 depends on PCI
2654 default n
2655 help
Alexandre Bouninefdf90ab2013-07-03 15:08:56 -07002656 If enabled this option will include drivers and the core
Alexandre Bounine388b78a2011-03-23 16:43:03 -07002657 infrastructure code to support RapidIO interconnect devices.
2658
2659source "drivers/rapidio/Kconfig"
2660
David Herrmanne3263ab2013-08-02 14:05:22 +02002661config X86_SYSFB
2662 bool "Mark VGA/VBE/EFI FB as generic system framebuffer"
2663 help
2664 Firmwares often provide initial graphics framebuffers so the BIOS,
2665 bootloader or kernel can show basic video-output during boot for
2666 user-guidance and debugging. Historically, x86 used the VESA BIOS
2667 Extensions and EFI-framebuffers for this, which are mostly limited
2668 to x86.
2669 This option, if enabled, marks VGA/VBE/EFI framebuffers as generic
2670 framebuffers so the new generic system-framebuffer drivers can be
2671 used on x86. If the framebuffer is not compatible with the generic
2672 modes, it is adverticed as fallback platform framebuffer so legacy
2673 drivers like efifb, vesafb and uvesafb can pick it up.
2674 If this option is not selected, all system framebuffers are always
2675 marked as fallback platform framebuffers as usual.
2676
2677 Note: Legacy fbdev drivers, including vesafb, efifb, uvesafb, will
2678 not be able to pick up generic system framebuffers if this option
2679 is selected. You are highly encouraged to enable simplefb as
2680 replacement if you select this option. simplefb can correctly deal
2681 with generic system framebuffers. But you should still keep vesafb
2682 and others enabled as fallback if a system framebuffer is
2683 incompatible with simplefb.
2684
2685 If unsure, say Y.
2686
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002687endmenu
2688
2689
2690menu "Executable file formats / Emulations"
2691
2692source "fs/Kconfig.binfmt"
2693
2694config IA32_EMULATION
2695 bool "IA32 Emulation"
2696 depends on X86_64
Randy Dunlapd1603992013-06-18 12:33:40 -07002697 select BINFMT_ELF
Roland McGratha97f52e2008-01-30 13:31:55 +01002698 select COMPAT_BINFMT_ELF
Brian Gerst3bead552015-06-22 07:55:19 -04002699 select ARCH_WANT_OLD_COMPAT_IPC
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002700 ---help---
H. J. Lu5fd92e62012-02-19 10:40:03 -08002701 Include code to run legacy 32-bit programs under a
2702 64-bit kernel. You should likely turn this on, unless you're
2703 100% sure that you don't have any 32-bit programs left.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002704
2705config IA32_AOUT
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002706 tristate "IA32 a.out support"
2707 depends on IA32_EMULATION
2708 ---help---
2709 Support old a.out binaries in the 32bit emulation.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002710
H. Peter Anvin0bf62762012-02-27 14:09:10 -08002711config X86_X32
Kees Cook6ea30382012-10-02 11:16:47 -07002712 bool "x32 ABI for 64-bit mode"
Brian Gerst9b540502015-06-22 07:55:21 -04002713 depends on X86_64
H. J. Lu5fd92e62012-02-19 10:40:03 -08002714 ---help---
2715 Include code to run binaries for the x32 native 32-bit ABI
2716 for 64-bit processors. An x32 process gets access to the
2717 full 64-bit register file and wide data path while leaving
2718 pointers at 32 bits for smaller memory footprint.
2719
2720 You will need a recent binutils (2.22 or later) with
2721 elf32_x86_64 support enabled to compile a kernel with this
2722 option set.
2723
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002724config COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002725 def_bool y
H. Peter Anvin0bf62762012-02-27 14:09:10 -08002726 depends on IA32_EMULATION || X86_X32
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002727
Jan Beulich3120e252012-09-10 12:41:45 +01002728if COMPAT
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002729config COMPAT_FOR_U64_ALIGNMENT
Jan Beulich3120e252012-09-10 12:41:45 +01002730 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002731
2732config SYSVIPC_COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002733 def_bool y
Jan Beulich3120e252012-09-10 12:41:45 +01002734 depends on SYSVIPC
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002735
David Howellsee009e4a02011-03-07 15:06:20 +00002736config KEYS_COMPAT
Jan Beulich3120e252012-09-10 12:41:45 +01002737 def_bool y
2738 depends on KEYS
2739endif
David Howellsee009e4a02011-03-07 15:06:20 +00002740
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002741endmenu
2742
2743
Keith Packarde5beae12008-11-03 18:21:45 +01002744config HAVE_ATOMIC_IOMAP
2745 def_bool y
2746 depends on X86_32
2747
Alessandro Rubini4692d772012-04-04 19:39:58 +02002748config X86_DEV_DMA_OPS
2749 bool
Alessandro Rubini83125a32012-04-04 19:40:21 +02002750 depends on X86_64 || STA2X11
Alessandro Rubini4692d772012-04-04 19:39:58 +02002751
Alessandro Rubinif7219a52012-04-04 19:40:10 +02002752config X86_DMA_REMAP
2753 bool
Alessandro Rubini83125a32012-04-04 19:40:21 +02002754 depends on STA2X11
Alessandro Rubinif7219a52012-04-04 19:40:10 +02002755
Li, Aubrey93e5ead2014-06-30 14:08:42 +08002756config PMC_ATOM
2757 def_bool y
2758 depends on PCI
2759
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002760source "net/Kconfig"
2761
2762source "drivers/Kconfig"
2763
2764source "drivers/firmware/Kconfig"
2765
2766source "fs/Kconfig"
2767
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002768source "arch/x86/Kconfig.debug"
2769
2770source "security/Kconfig"
2771
2772source "crypto/Kconfig"
2773
Avi Kivityedf88412007-12-16 11:02:48 +02002774source "arch/x86/kvm/Kconfig"
2775
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002776source "lib/Kconfig"