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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
25 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
Stephen Boyd446f24d2013-04-30 15:28:42 -070026 select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
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
Ross Zwisler61031952015-06-25 03:08:39 -040030 select ARCH_HAS_PMEM_API
Ingo Molnar6471b822015-06-03 10:00:13 +020031 select ARCH_HAS_SG_CHAIN
32 select ARCH_HAVE_NMI_SAFE_CMPXCHG
33 select ARCH_MIGHT_HAVE_ACPI_PDC if ACPI
Mark Salter77fbbc82013-10-07 22:18:07 -040034 select ARCH_MIGHT_HAVE_PC_PARPORT
Mark Salter5e2c18c2014-01-01 11:34:16 -080035 select ARCH_MIGHT_HAVE_PC_SERIO
Ingo Molnar6471b822015-06-03 10:00:13 +020036 select ARCH_SUPPORTS_ATOMIC_RMW
Mel Gorman3b242c62015-06-30 14:57:13 -070037 select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
Ingo Molnar6471b822015-06-03 10:00:13 +020038 select ARCH_SUPPORTS_INT128 if X86_64
39 select ARCH_SUPPORTS_NUMA_BALANCING if X86_64
40 select ARCH_USE_BUILTIN_BSWAP
41 select ARCH_USE_CMPXCHG_LOCKREF if X86_64
42 select ARCH_USE_QUEUED_RWLOCKS
43 select ARCH_USE_QUEUED_SPINLOCKS
Ingo Molnar5aaeb5c2015-07-17 12:28:12 +020044 select ARCH_WANTS_DYNAMIC_TASK_STRUCT
Ingo Molnarda4276b2009-01-07 11:05:10 +010045 select ARCH_WANT_FRAME_POINTERS
Ingo Molnar6471b822015-06-03 10:00:13 +020046 select ARCH_WANT_IPC_PARSE_VERSION if X86_32
47 select ARCH_WANT_OPTIONAL_GPIOLIB
48 select BUILDTIME_EXTABLE_SORT
49 select CLKEVT_I8253
50 select CLKSRC_I8253 if X86_32
51 select CLOCKSOURCE_VALIDATE_LAST_CYCLE
52 select CLOCKSOURCE_WATCHDOG
53 select CLONE_BACKWARDS if X86_32
54 select COMPAT_OLD_SIGACTION if IA32_EMULATION
55 select DCACHE_WORD_ACCESS
Linus Torvalds45471cd2015-06-24 19:52:06 -070056 select EDAC_ATOMIC_SCRUB
57 select EDAC_SUPPORT
Ingo Molnar6471b822015-06-03 10:00:13 +020058 select GENERIC_CLOCKEVENTS
59 select GENERIC_CLOCKEVENTS_BROADCAST if X86_64 || (X86_32 && X86_LOCAL_APIC)
60 select GENERIC_CLOCKEVENTS_MIN_ADJUST
61 select GENERIC_CMOS_UPDATE
62 select GENERIC_CPU_AUTOPROBE
63 select GENERIC_EARLY_IOREMAP
64 select GENERIC_FIND_FIRST_BIT
65 select GENERIC_IOMAP
66 select GENERIC_IRQ_PROBE
67 select GENERIC_IRQ_SHOW
68 select GENERIC_PENDING_IRQ if SMP
69 select GENERIC_SMP_IDLE_THREAD
70 select GENERIC_STRNCPY_FROM_USER
71 select GENERIC_STRNLEN_USER
72 select GENERIC_TIME_VSYSCALL
73 select HAVE_ACPI_APEI if ACPI
74 select HAVE_ACPI_APEI_NMI if ACPI
75 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
76 select HAVE_AOUT if X86_32
77 select HAVE_ARCH_AUDITSYSCALL
78 select HAVE_ARCH_HUGE_VMAP if X86_64 || X86_PAE
79 select HAVE_ARCH_JUMP_LABEL
80 select HAVE_ARCH_KASAN if X86_64 && SPARSEMEM_VMEMMAP
81 select HAVE_ARCH_KGDB
82 select HAVE_ARCH_KMEMCHECK
83 select HAVE_ARCH_SECCOMP_FILTER
84 select HAVE_ARCH_SOFT_DIRTY if X86_64
85 select HAVE_ARCH_TRACEHOOK
86 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
87 select HAVE_BPF_JIT if X86_64
88 select HAVE_CC_STACKPROTECTOR
89 select HAVE_CMPXCHG_DOUBLE
90 select HAVE_CMPXCHG_LOCAL
91 select HAVE_CONTEXT_TRACKING if X86_64
Josh Triplettc1bd55f2015-06-30 15:00:00 -070092 select HAVE_COPY_THREAD_TLS
Ingo Molnar6471b822015-06-03 10:00:13 +020093 select HAVE_C_RECORDMCOUNT
94 select HAVE_DEBUG_KMEMLEAK
95 select HAVE_DEBUG_STACKOVERFLOW
96 select HAVE_DMA_API_DEBUG
FUJITA Tomonori7c095e42009-06-17 16:28:12 -070097 select HAVE_DMA_ATTRS
Akinobu Mita9c5a3622014-06-04 16:06:50 -070098 select HAVE_DMA_CONTIGUOUS
Steven Rostedt677aa9f2008-05-17 00:01:36 -040099 select HAVE_DYNAMIC_FTRACE
Masami Hiramatsu06aeaae2012-09-28 17:15:17 +0900100 select HAVE_DYNAMIC_FTRACE_WITH_REGS
Johannes Berg58340a02008-07-25 01:45:33 -0700101 select HAVE_EFFICIENT_UNALIGNED_ACCESS
Ingo Molnar6471b822015-06-03 10:00:13 +0200102 select HAVE_FENTRY if X86_64
103 select HAVE_FTRACE_MCOUNT_RECORD
104 select HAVE_FUNCTION_GRAPH_FP_TEST
105 select HAVE_FUNCTION_GRAPH_TRACER
106 select HAVE_FUNCTION_TRACER
107 select HAVE_GENERIC_DMA_COHERENT if X86_32
K.Prasad0067f122009-06-01 23:43:57 +0530108 select HAVE_HW_BREAKPOINT
Ingo Molnar6471b822015-06-03 10:00:13 +0200109 select HAVE_IDE
110 select HAVE_IOREMAP_PROT
111 select HAVE_IRQ_EXIT_ON_IRQ_STACK if X86_64
112 select HAVE_IRQ_TIME_ACCOUNTING
113 select HAVE_KERNEL_BZIP2
114 select HAVE_KERNEL_GZIP
115 select HAVE_KERNEL_LZ4
116 select HAVE_KERNEL_LZMA
117 select HAVE_KERNEL_LZO
118 select HAVE_KERNEL_XZ
119 select HAVE_KPROBES
120 select HAVE_KPROBES_ON_FTRACE
121 select HAVE_KRETPROBES
122 select HAVE_KVM
123 select HAVE_LIVEPATCH if X86_64
124 select HAVE_MEMBLOCK
125 select HAVE_MEMBLOCK_NODE_MAP
Frederic Weisbecker01027522010-04-11 18:55:56 +0200126 select HAVE_MIXED_BREAKPOINTS_REGS
Ingo Molnar6471b822015-06-03 10:00:13 +0200127 select HAVE_OPROFILE
128 select HAVE_OPTPROBES
129 select HAVE_PCSPKR_PLATFORM
130 select HAVE_PERF_EVENTS
Frederic Weisbeckerc01d4322010-05-15 22:57:48 +0200131 select HAVE_PERF_EVENTS_NMI
Jiri Olsac5e63192012-08-07 15:20:36 +0200132 select HAVE_PERF_REGS
Jiri Olsac5ebced2012-08-07 15:20:40 +0200133 select HAVE_PERF_USER_STACK_DUMP
Ingo Molnar6471b822015-06-03 10:00:13 +0200134 select HAVE_REGS_AND_STACK_ACCESS_API
135 select HAVE_SYSCALL_TRACEPOINTS
136 select HAVE_UID16 if X86_32
137 select HAVE_UNSTABLE_SCHED_CLOCK
Avi Kivity7c68af62009-09-19 09:40:22 +0300138 select HAVE_USER_RETURN_NOTIFIER
Thomas Gleixnerc01858082011-02-07 02:24:08 +0100139 select IRQ_FORCED_THREADING
Ingo Molnar6471b822015-06-03 10:00:13 +0200140 select MODULES_USE_ELF_RELA if X86_64
141 select MODULES_USE_ELF_REL if X86_32
142 select OLD_SIGACTION if X86_32
143 select OLD_SIGSUSPEND3 if X86_32 || IA32_EMULATION
144 select PERF_EVENTS
Prarit Bhargava3195ef52013-02-14 12:02:54 -0500145 select RTC_LIB
Ingo Molnar6471b822015-06-03 10:00:13 +0200146 select SPARSE_IRQ
Pranith Kumar83fe27e2014-12-05 11:24:45 -0500147 select SRCU
Ingo Molnar6471b822015-06-03 10:00:13 +0200148 select SYSCTL_EXCEPTION_TRACE
149 select USER_STACKTRACE_SUPPORT
150 select VIRT_TO_BUS
151 select X86_DEV_DMA_OPS if X86_64
152 select X86_FEATURE_NAMES if PROC_FS
Balbir Singh7d8330a2008-02-10 12:46:28 +0530153
Ingo Molnarba7e4d12009-06-06 13:58:12 +0200154config INSTRUCTION_DECODER
Jan Beulich3120e252012-09-10 12:41:45 +0100155 def_bool y
156 depends on KPROBES || PERF_EVENTS || UPROBES
Ingo Molnarba7e4d12009-06-06 13:58:12 +0200157
Peter Zijlstra7fb0f1d2014-10-24 09:12:35 +0200158config PERF_EVENTS_INTEL_UNCORE
159 def_bool y
Peter Zijlstra (Intel)ce5686d2014-10-29 11:17:04 +0100160 depends on PERF_EVENTS && CPU_SUP_INTEL && PCI
Peter Zijlstra7fb0f1d2014-10-24 09:12:35 +0200161
Linus Torvalds51b26ad2009-04-26 10:12:47 -0700162config OUTPUT_FORMAT
163 string
164 default "elf32-i386" if X86_32
165 default "elf64-x86-64" if X86_64
166
Sam Ravnborg73531902008-05-25 23:03:18 +0200167config ARCH_DEFCONFIG
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +0200168 string
Sam Ravnborg73531902008-05-25 23:03:18 +0200169 default "arch/x86/configs/i386_defconfig" if X86_32
170 default "arch/x86/configs/x86_64_defconfig" if X86_64
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +0200171
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100172config LOCKDEP_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100173 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100174
175config STACKTRACE_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100176 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100177
Heiko Carstensaa7d9352008-02-01 17:45:14 +0100178config HAVE_LATENCYTOP_SUPPORT
179 def_bool y
180
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100181config MMU
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100182 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100183
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100184config SBUS
185 bool
186
FUJITA Tomonori3bc4e452010-03-10 15:23:22 -0800187config NEED_DMA_MAP_STATE
Jan Beulich3120e252012-09-10 12:41:45 +0100188 def_bool y
Konrad Rzeszutek Wilka6dfa122015-04-17 15:04:48 -0400189 depends on X86_64 || INTEL_IOMMU || DMA_API_DEBUG || SWIOTLB
FUJITA Tomonori3bc4e452010-03-10 15:23:22 -0800190
FUJITA Tomonori18e98302010-05-26 14:44:32 -0700191config NEED_SG_DMA_LENGTH
Andrew Morton4a14d842010-05-26 14:44:33 -0700192 def_bool y
FUJITA Tomonori18e98302010-05-26 14:44:32 -0700193
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100194config GENERIC_ISA_DMA
Jan Beulich3120e252012-09-10 12:41:45 +0100195 def_bool y
196 depends on ISA_DMA_API
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100197
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100198config GENERIC_BUG
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100199 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100200 depends on BUG
Jan Beulichb93a5312008-12-16 11:40:27 +0000201 select GENERIC_BUG_RELATIVE_POINTERS if X86_64
202
203config GENERIC_BUG_RELATIVE_POINTERS
204 bool
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100205
206config GENERIC_HWEIGHT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100207 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100208
209config ARCH_MAY_HAVE_PC_FDC
Jan Beulich3120e252012-09-10 12:41:45 +0100210 def_bool y
211 depends on ISA_DMA_API
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100212
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100213config RWSEM_XCHGADD_ALGORITHM
Jan Beulich3120e252012-09-10 12:41:45 +0100214 def_bool y
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100215
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100216config GENERIC_CALIBRATE_DELAY
217 def_bool y
218
venkatesh.pallipadi@intel.com9a0b8412008-01-31 17:35:06 -0800219config ARCH_HAS_CPU_RELAX
220 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100221
Pekka Enberg1b27d052008-04-28 02:12:22 -0700222config ARCH_HAS_CACHE_LINE_SIZE
223 def_bool y
224
Mike Travisdd5af902008-01-30 13:33:32 +0100225config HAVE_SETUP_PER_CPU_AREA
Brian Gerst89c9c4c2009-01-27 12:56:48 +0900226 def_bool y
travis@sgi.comb32ef632008-01-30 13:32:51 +0100227
Tejun Heo08fc4582009-08-14 15:00:49 +0900228config NEED_PER_CPU_EMBED_FIRST_CHUNK
229 def_bool y
230
231config NEED_PER_CPU_PAGE_FIRST_CHUNK
Tejun Heo11124412009-02-20 16:29:09 +0900232 def_bool y
233
Johannes Berg801e4062007-12-08 02:12:39 +0100234config ARCH_HIBERNATION_POSSIBLE
235 def_bool y
Johannes Berg801e4062007-12-08 02:12:39 +0100236
Johannes Bergf4cb5702007-12-08 02:14:00 +0100237config ARCH_SUSPEND_POSSIBLE
238 def_bool y
Johannes Bergf4cb5702007-12-08 02:14:00 +0100239
Steve Cappercfe28c52013-04-29 14:29:48 +0100240config ARCH_WANT_HUGE_PMD_SHARE
241 def_bool y
242
Steve Capper53313b22013-04-30 08:03:42 +0100243config ARCH_WANT_GENERAL_HUGETLB
244 def_bool y
245
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100246config ZONE_DMA32
Jan Beuliche0fd24a2015-02-05 15:39:34 +0000247 def_bool y if X86_64
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100248
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100249config AUDIT_ARCH
Jan Beuliche0fd24a2015-02-05 15:39:34 +0000250 def_bool y if X86_64
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100251
Ingo Molnar765c68b2008-04-09 11:03:37 +0200252config ARCH_SUPPORTS_OPTIMIZED_INLINING
253 def_bool y
254
Akinobu Mita6a11f752009-03-31 15:23:17 -0700255config ARCH_SUPPORTS_DEBUG_PAGEALLOC
256 def_bool y
257
Andrey Ryabinind6f2d752015-07-02 12:09:38 +0300258config KASAN_SHADOW_OFFSET
259 hex
260 depends on KASAN
261 default 0xdffffc0000000000
262
Shane Wang69575d32009-09-01 18:25:07 -0700263config HAVE_INTEL_TXT
264 def_bool y
Kees Cook6ea30382012-10-02 11:16:47 -0700265 depends on INTEL_IOMMU && ACPI
Shane Wang69575d32009-09-01 18:25:07 -0700266
Sam Ravnborg6b0c3d42008-01-30 13:32:27 +0100267config X86_32_SMP
268 def_bool y
269 depends on X86_32 && SMP
270
271config X86_64_SMP
272 def_bool y
273 depends on X86_64 && SMP
274
Tejun Heoccbeed32009-02-09 22:17:40 +0900275config X86_32_LAZY_GS
276 def_bool y
Tejun Heo60a53172009-02-09 22:17:40 +0900277 depends on X86_32 && !CC_STACKPROTECTOR
Tejun Heoccbeed32009-02-09 22:17:40 +0900278
Borislav Petkovd61931d2010-03-05 17:34:46 +0100279config ARCH_HWEIGHT_CFLAGS
280 string
281 default "-fcall-saved-ecx -fcall-saved-edx" if X86_32
282 default "-fcall-saved-rdi -fcall-saved-rsi -fcall-saved-rdx -fcall-saved-rcx -fcall-saved-r8 -fcall-saved-r9 -fcall-saved-r10 -fcall-saved-r11" if X86_64
283
Srikar Dronamraju2b144492012-02-09 14:56:42 +0530284config ARCH_SUPPORTS_UPROBES
285 def_bool y
286
Rob Herringd20642f2014-04-18 17:19:54 -0500287config FIX_EARLYCON_MEM
288 def_bool y
289
Kirill A. Shutemov98233362015-04-14 15:46:14 -0700290config PGTABLE_LEVELS
291 int
292 default 4 if X86_64
293 default 3 if X86_PAE
294 default 2
295
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100296source "init/Kconfig"
Matt Helsleydc52ddc2008-10-18 20:27:21 -0700297source "kernel/Kconfig.freezer"
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100298
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100299menu "Processor type and features"
300
Randy Dunlap5ee71532012-01-16 11:57:18 -0800301config ZONE_DMA
302 bool "DMA memory allocation support" if EXPERT
303 default y
304 help
305 DMA memory allocation support allows devices with less than 32-bit
306 addressing to allocate within the first 16MB of address space.
307 Disable if no such devices will be used.
308
309 If unsure, say Y.
310
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100311config SMP
312 bool "Symmetric multi-processing support"
313 ---help---
314 This enables support for systems with more than one CPU. If you have
Robert Graffham4a474152014-01-23 15:55:29 -0800315 a system with only one CPU, say N. If you have a system with more
316 than one CPU, say Y.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100317
Robert Graffham4a474152014-01-23 15:55:29 -0800318 If you say N here, the kernel will run on uni- and multiprocessor
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100319 machines, but will use only one CPU of a multiprocessor machine. If
320 you say Y here, the kernel will run on many, but not all,
Robert Graffham4a474152014-01-23 15:55:29 -0800321 uniprocessor machines. On a uniprocessor machine, the kernel
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100322 will run faster if you say N here.
323
324 Note that if you say Y here and choose architecture "586" or
325 "Pentium" under "Processor family", the kernel will not work on 486
326 architectures. Similarly, multiprocessor kernels for the "PPro"
327 architecture may not work on all Pentium based boards.
328
329 People using multiprocessor machines who say Y here should also say
330 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
331 Management" code will be disabled if you say Y here.
332
Paul Bolle395cf962011-08-15 02:02:26 +0200333 See also <file:Documentation/x86/i386/IO-APIC.txt>,
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100334 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
335 <http://www.tldp.org/docs.html#howto>.
336
337 If you don't know what to do here, say N.
338
Josh Triplett9def39be2013-10-30 08:09:45 -0700339config X86_FEATURE_NAMES
340 bool "Processor feature human-readable names" if EMBEDDED
341 default y
342 ---help---
343 This option compiles in a table of x86 feature bits and corresponding
344 names. This is required to support /proc/cpuinfo and a few kernel
345 messages. You can disable this to save space, at the expense of
346 making those few kernel messages show numeric feature bits instead.
347
348 If in doubt, say Y.
349
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800350config X86_X2APIC
351 bool "Support x2apic"
Jan Kiszka19e3d602015-05-04 17:58:01 +0200352 depends on X86_LOCAL_APIC && X86_64 && (IRQ_REMAP || HYPERVISOR_GUEST)
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800353 ---help---
354 This enables x2apic support on CPUs that have this feature.
355
356 This allows 32-bit apic IDs (so it can support very large systems),
357 and accesses the local apic via MSRs not via mmio.
358
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800359 If you don't know what to do here, say N.
360
Yinghai Lu6695c852008-06-19 12:13:09 -0700361config X86_MPPARSE
Bin Gao6e87f9b72012-10-25 09:35:44 -0700362 bool "Enable MPS table" if ACPI || SFI
Jan Beulich7a527682008-10-30 10:38:24 +0000363 default y
Ingo Molnar5ab74722008-07-10 14:42:03 +0200364 depends on X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100365 ---help---
Yinghai Lu6695c852008-06-19 12:13:09 -0700366 For old smp systems that do not have proper acpi support. Newer systems
367 (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
Yinghai Lu6695c852008-06-19 12:13:09 -0700368
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800369config X86_BIGSMP
370 bool "Support for big SMP systems with more than 8 CPUs"
371 depends on X86_32 && SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100372 ---help---
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800373 This option is needed for the systems that have more than 8 CPUs
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100374
Jun Nakajimaddd70cf2013-01-21 17:23:09 +0000375config GOLDFISH
376 def_bool y
377 depends on X86_GOLDFISH
378
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800379if X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800380config X86_EXTENDED_PLATFORM
381 bool "Support for extended (non-PC) x86 platforms"
382 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100383 ---help---
Ingo Molnar06ac8342009-01-27 18:11:43 +0100384 If you disable this option then the kernel will only support
385 standard PC platforms. (which covers the vast majority of
386 systems out there.)
387
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800388 If you enable this option then you'll be able to select support
389 for the following (non-PC) 32 bit x86 platforms:
Ben Hutchingscb7b8022013-06-24 01:05:25 +0100390 Goldfish (Android emulator)
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800391 AMD Elan
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800392 RDC R-321x SoC
393 SGI 320/540 (Visual Workstation)
Alessandro Rubini83125a32012-04-04 19:40:21 +0200394 STA2X11-based (e.g. Northville)
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200395 Moorestown MID devices
Ingo Molnar06ac8342009-01-27 18:11:43 +0100396
397 If you have one of these systems, or if you want to build a
398 generic distribution kernel, say Y here - otherwise say N.
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800399endif
Ingo Molnar06ac8342009-01-27 18:11:43 +0100400
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800401if X86_64
402config X86_EXTENDED_PLATFORM
403 bool "Support for extended (non-PC) x86 platforms"
404 default y
405 ---help---
406 If you disable this option then the kernel will only support
407 standard PC platforms. (which covers the vast majority of
408 systems out there.)
409
410 If you enable this option then you'll be able to select support
411 for the following (non-PC) 64 bit x86 platforms:
Steffen Persvold44b111b2011-12-06 00:07:26 +0800412 Numascale NumaChip
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800413 ScaleMP vSMP
414 SGI Ultraviolet
415
416 If you have one of these systems, or if you want to build a
417 generic distribution kernel, say Y here - otherwise say N.
418endif
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800419# This is an alphabetically sorted list of 64 bit extended platforms
420# Please maintain the alphabetic order if and when there are additions
Steffen Persvold44b111b2011-12-06 00:07:26 +0800421config X86_NUMACHIP
422 bool "Numascale NumaChip"
423 depends on X86_64
424 depends on X86_EXTENDED_PLATFORM
425 depends on NUMA
426 depends on SMP
427 depends on X86_X2APIC
Daniel J Bluemanf9726bf2012-12-07 14:24:32 -0700428 depends on PCI_MMCONFIG
Steffen Persvold44b111b2011-12-06 00:07:26 +0800429 ---help---
430 Adds support for Numascale NumaChip large-SMP systems. Needed to
431 enable more than ~168 cores.
432 If you don't have one of these, you should say N here.
Nick Piggin03b48632009-01-20 04:36:04 +0100433
Ingo Molnar6a485652009-01-27 18:29:13 +0100434config X86_VSMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800435 bool "ScaleMP vSMP"
Borislav Petkov6276a072013-03-04 21:20:21 +0100436 select HYPERVISOR_GUEST
Ingo Molnar6a485652009-01-27 18:29:13 +0100437 select PARAVIRT
438 depends on X86_64 && PCI
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800439 depends on X86_EXTENDED_PLATFORM
Shai Fultheimead91d42012-04-16 10:39:35 +0300440 depends on SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100441 ---help---
Ingo Molnar6a485652009-01-27 18:29:13 +0100442 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
443 supposed to run on these EM64T-based machines. Only choose this option
444 if you have one of these machines.
445
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800446config X86_UV
447 bool "SGI Ultraviolet"
448 depends on X86_64
449 depends on X86_EXTENDED_PLATFORM
Jack Steiner54c28d22009-04-03 15:39:42 -0500450 depends on NUMA
Suresh Siddha9d6c26e2009-04-20 13:02:31 -0700451 depends on X86_X2APIC
Ingo Molnar1222e562015-05-06 06:23:59 +0200452 depends on PCI
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800453 ---help---
454 This option is needed in order to support SGI Ultraviolet systems.
455 If you don't have one of these, you should say N here.
456
457# Following is an alphabetically sorted list of 32 bit extended platforms
458# Please maintain the alphabetic order if and when there are additions
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100459
Jun Nakajimaddd70cf2013-01-21 17:23:09 +0000460config X86_GOLDFISH
461 bool "Goldfish (Virtual Platform)"
Ben Hutchingscb7b8022013-06-24 01:05:25 +0100462 depends on X86_EXTENDED_PLATFORM
Jun Nakajimaddd70cf2013-01-21 17:23:09 +0000463 ---help---
464 Enable support for the Goldfish virtual platform used primarily
465 for Android development. Unless you are building for the Android
466 Goldfish emulator say N here.
467
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800468config X86_INTEL_CE
469 bool "CE4100 TV platform"
470 depends on PCI
471 depends on PCI_GODIRECT
Jiang Liu6084a6e2014-06-09 16:19:46 +0800472 depends on X86_IO_APIC
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800473 depends on X86_32
474 depends on X86_EXTENDED_PLATFORM
Dirk Brandewie37bc9f52010-11-09 12:08:08 -0800475 select X86_REBOOTFIXUPS
Sebastian Andrzej Siewiorda6b7372011-02-22 21:07:37 +0100476 select OF
477 select OF_EARLY_FLATTREE
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800478 ---help---
479 Select for the Intel CE media processor (CE4100) SOC.
480 This option compiles in support for the CE4100 SOC for settop
481 boxes and media devices.
482
David Cohen4cb9b002013-12-16 17:37:26 -0800483config X86_INTEL_MID
Alan Cox43605ef2011-07-12 17:49:29 +0100484 bool "Intel MID platform support"
485 depends on X86_32
486 depends on X86_EXTENDED_PLATFORM
David Cohenedc6bc72014-01-21 10:41:39 -0800487 depends on X86_PLATFORM_DEVICES
Alan Cox1ea7c672011-11-10 13:29:14 +0000488 depends on PCI
489 depends on PCI_GOANY
490 depends on X86_IO_APIC
Alan Cox7c9c3a12011-12-29 14:43:16 +0000491 select SFI
David Cohen4cb9b002013-12-16 17:37:26 -0800492 select I2C
Alan Cox7c9c3a12011-12-29 14:43:16 +0000493 select DW_APB_TIMER
Alan Cox1ea7c672011-11-10 13:29:14 +0000494 select APB_TIMER
Alan Cox1ea7c672011-11-10 13:29:14 +0000495 select INTEL_SCU_IPC
Mika Westerberg15a713d2012-01-26 17:35:05 +0000496 select MFD_INTEL_MSIC
Alan Cox1ea7c672011-11-10 13:29:14 +0000497 ---help---
David Cohen4cb9b002013-12-16 17:37:26 -0800498 Select to build a kernel capable of supporting Intel MID (Mobile
499 Internet Device) platform systems which do not have the PCI legacy
500 interfaces. If you are building for a PC class system say N here.
Alan Cox1ea7c672011-11-10 13:29:14 +0000501
David Cohen4cb9b002013-12-16 17:37:26 -0800502 Intel MID platforms are based on an Intel processor and chipset which
503 consume less power than most of the x86 derivatives.
Alan Cox43605ef2011-07-12 17:49:29 +0100504
Bryan O'Donoghue8bbc2a12015-01-30 16:29:39 +0000505config X86_INTEL_QUARK
506 bool "Intel Quark platform support"
507 depends on X86_32
508 depends on X86_EXTENDED_PLATFORM
509 depends on X86_PLATFORM_DEVICES
510 depends on X86_TSC
511 depends on PCI
512 depends on PCI_GOANY
513 depends on X86_IO_APIC
514 select IOSF_MBI
515 select INTEL_IMR
Andy Shevchenko9ab6eb52015-03-05 17:24:04 +0200516 select COMMON_CLK
Bryan O'Donoghue8bbc2a12015-01-30 16:29:39 +0000517 ---help---
518 Select to include support for Quark X1000 SoC.
519 Say Y here if you have a Quark based system such as the Arduino
520 compatible Intel Galileo.
521
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000522config X86_INTEL_LPSS
523 bool "Intel Low Power Subsystem Support"
524 depends on ACPI
525 select COMMON_CLK
Mathias Nyman0f531432013-09-13 17:02:29 +0300526 select PINCTRL
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000527 ---help---
528 Select to build support for Intel Low Power Subsystem such as
529 found on Intel Lynxpoint PCH. Selecting this option enables
Mathias Nyman0f531432013-09-13 17:02:29 +0300530 things like clock tree (common clock framework) and pincontrol
531 which are needed by the LPSS peripheral drivers.
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000532
Ken Xue92082a82015-02-06 08:27:51 +0800533config X86_AMD_PLATFORM_DEVICE
534 bool "AMD ACPI2Platform devices support"
535 depends on ACPI
536 select COMMON_CLK
537 select PINCTRL
538 ---help---
539 Select to interpret AMD specific ACPI device to platform device
540 such as I2C, UART, GPIO found on AMD Carrizo and later chipsets.
541 I2C and UART depend on COMMON_CLK to set clock. GPIO driver is
542 implemented under PINCTRL subsystem.
543
David E. Boxced3ce72014-09-17 22:13:50 -0700544config IOSF_MBI
545 tristate "Intel SoC IOSF Sideband support for SoC platforms"
546 depends on PCI
547 ---help---
548 This option enables sideband register access support for Intel SoC
549 platforms. On these platforms the IOSF sideband is used in lieu of
550 MSR's for some register accesses, mostly but not limited to thermal
551 and power. Drivers may query the availability of this device to
552 determine if they need the sideband in order to work on these
553 platforms. The sideband is available on the following SoC products.
554 This list is not meant to be exclusive.
555 - BayTrail
556 - Braswell
557 - Quark
558
559 You should say Y if you are running a kernel on one of these SoC's.
560
David E. Boxed2226b2014-09-17 22:13:51 -0700561config IOSF_MBI_DEBUG
562 bool "Enable IOSF sideband access through debugfs"
563 depends on IOSF_MBI && DEBUG_FS
564 ---help---
565 Select this option to expose the IOSF sideband access registers (MCR,
566 MDR, MCRX) through debugfs to write and read register information from
567 different units on the SoC. This is most useful for obtaining device
568 state information for debug and analysis. As this is a general access
569 mechanism, users of this option would have specific knowledge of the
570 device they want to access.
571
572 If you don't require the option or are in doubt, say N.
573
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800574config X86_RDC321X
575 bool "RDC R-321x SoC"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100576 depends on X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800577 depends on X86_EXTENDED_PLATFORM
578 select M486
579 select X86_REBOOTFIXUPS
580 ---help---
581 This option is needed for RDC R-321x system-on-chip, also known
582 as R-8610-(G).
583 If you don't have one of these chips, you should say N here.
584
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100585config X86_32_NON_STANDARD
Ingo Molnar9c398012009-01-27 18:24:57 +0100586 bool "Support non-standard 32-bit SMP architectures"
587 depends on X86_32 && SMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800588 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100589 ---help---
H. Peter Anvinb5660ba2014-02-25 12:14:06 -0800590 This option compiles in the bigsmp and STA2X11 default
591 subarchitectures. It is intended for a generic binary
592 kernel. If you select them all, kernel will probe it one by
593 one and will fallback to default.
Yinghai Lud49c4282008-06-08 18:31:54 -0700594
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800595# Alphabetically sorted list of Non standard 32 bit platforms
Yinghai Lud49c4282008-06-08 18:31:54 -0700596
Linus Torvaldsd949f362009-09-26 09:35:07 -0700597config X86_SUPPORTS_MEMORY_FAILURE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100598 def_bool y
Linus Torvaldsd949f362009-09-26 09:35:07 -0700599 # MCE code calls memory_failure():
600 depends on X86_MCE
601 # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
Linus Torvaldsd949f362009-09-26 09:35:07 -0700602 # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
603 depends on X86_64 || !SPARSEMEM
604 select ARCH_SUPPORTS_MEMORY_FAILURE
Linus Torvaldsd949f362009-09-26 09:35:07 -0700605
Alessandro Rubini83125a32012-04-04 19:40:21 +0200606config STA2X11
607 bool "STA2X11 Companion Chip Support"
608 depends on X86_32_NON_STANDARD && PCI
609 select X86_DEV_DMA_OPS
610 select X86_DMA_REMAP
611 select SWIOTLB
612 select MFD_STA2X11
613 select ARCH_REQUIRE_GPIOLIB
614 default n
615 ---help---
616 This adds support for boards based on the STA2X11 IO-Hub,
617 a.k.a. "ConneXt". The chip is used in place of the standard
618 PC chipset, so all "standard" peripherals are missing. If this
619 option is selected the kernel will still be able to boot on
620 standard PC machines.
621
Shérab82148d12010-09-25 06:06:57 +0200622config X86_32_IRIS
623 tristate "Eurobraille/Iris poweroff module"
624 depends on X86_32
625 ---help---
626 The Iris machines from EuroBraille do not have APM or ACPI support
627 to shut themselves down properly. A special I/O sequence is
628 needed to do so, which is what this module does at
629 kernel shutdown.
630
631 This is only for Iris machines from EuroBraille.
632
633 If unused, say N.
634
Ingo Molnarae1e9132008-11-11 09:05:16 +0100635config SCHED_OMIT_FRAME_POINTER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100636 def_bool y
637 prompt "Single-depth WCHAN output"
Ken Chena87d0912008-11-06 11:10:49 -0800638 depends on X86
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100639 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100640 Calculate simpler /proc/<PID>/wchan values. If this option
641 is disabled then wchan values will recurse back to the
642 caller function. This provides more accurate wchan values,
643 at the expense of slightly more scheduling overhead.
644
645 If in doubt, say "Y".
646
Borislav Petkov6276a072013-03-04 21:20:21 +0100647menuconfig HYPERVISOR_GUEST
648 bool "Linux guest support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100649 ---help---
Borislav Petkov6276a072013-03-04 21:20:21 +0100650 Say Y here to enable options for running Linux under various hyper-
651 visors. This option enables basic hypervisor detection and platform
652 setup.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100653
Borislav Petkov6276a072013-03-04 21:20:21 +0100654 If you say N, all options in this submenu will be skipped and
655 disabled, and Linux guest support won't be built in.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100656
Borislav Petkov6276a072013-03-04 21:20:21 +0100657if HYPERVISOR_GUEST
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100658
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100659config PARAVIRT
660 bool "Enable paravirtualization code"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100661 ---help---
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100662 This changes the kernel so it can modify itself when it is run
663 under a hypervisor, potentially improving performance significantly
664 over full virtualization. However, when run without a hypervisor
665 the kernel is theoretically slower and slightly larger.
666
Borislav Petkov6276a072013-03-04 21:20:21 +0100667config PARAVIRT_DEBUG
668 bool "paravirt-ops debugging"
669 depends on PARAVIRT && DEBUG_KERNEL
670 ---help---
671 Enable to debug paravirt_ops internals. Specifically, BUG if
672 a paravirt_op is missing when it is called.
673
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700674config PARAVIRT_SPINLOCKS
675 bool "Paravirtualization layer for spinlocks"
Kees Cook6ea30382012-10-02 11:16:47 -0700676 depends on PARAVIRT && SMP
Ingo Molnar62c7a1e2015-05-11 09:47:23 +0200677 select UNINLINE_SPIN_UNLOCK if !QUEUED_SPINLOCKS
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700678 ---help---
679 Paravirtualized spinlocks allow a pvops backend to replace the
680 spinlock implementation with something virtualization-friendly
681 (for example, block the virtual CPU rather than spinning).
682
Raghavendra K T4c4e4f62013-10-21 21:35:08 +0530683 It has a minimal impact on native kernels and gives a nice performance
684 benefit on paravirtualized KVM / Xen kernels.
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700685
Raghavendra K T4c4e4f62013-10-21 21:35:08 +0530686 If you are unsure how to answer this question, answer Y.
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700687
Borislav Petkov6276a072013-03-04 21:20:21 +0100688source "arch/x86/xen/Kconfig"
689
690config KVM_GUEST
691 bool "KVM Guest support (including kvmclock)"
692 depends on PARAVIRT
693 select PARAVIRT_CLOCK
694 default y
695 ---help---
696 This option enables various optimizations for running under the KVM
697 hypervisor. It includes a paravirtualized clock, so that instead
698 of relying on a PIT (or probably other) emulation by the
699 underlying device model, the host provides the guest with
700 timing infrastructure such as time of day, and system time
701
Srivatsa Vaddagiri1e20eb82013-08-09 19:52:01 +0530702config KVM_DEBUG_FS
703 bool "Enable debug information for KVM Guests in debugfs"
704 depends on KVM_GUEST && DEBUG_FS
705 default n
706 ---help---
707 This option enables collection of various statistics for KVM guest.
708 Statistics are displayed in debugfs filesystem. Enabling this option
709 may incur significant overhead.
710
Borislav Petkov6276a072013-03-04 21:20:21 +0100711source "arch/x86/lguest/Kconfig"
712
713config PARAVIRT_TIME_ACCOUNTING
714 bool "Paravirtual steal time accounting"
715 depends on PARAVIRT
716 default n
717 ---help---
718 Select this option to enable fine granularity task steal time
719 accounting. Time spent executing other tasks in parallel with
720 the current vCPU is discounted from the vCPU power. To account for
721 that, there can be a small performance impact.
722
723 If in doubt, say N here.
724
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200725config PARAVIRT_CLOCK
726 bool
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200727
Borislav Petkov6276a072013-03-04 21:20:21 +0100728endif #HYPERVISOR_GUEST
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400729
Yinghai Lu08677212010-02-10 01:20:20 -0800730config NO_BOOTMEM
Yinghai Lu774ea0b2010-08-25 13:39:18 -0700731 def_bool y
Yinghai Lu08677212010-02-10 01:20:20 -0800732
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100733source "arch/x86/Kconfig.cpu"
734
735config HPET_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100736 def_bool X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100737 prompt "HPET Timer Support" if X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100738 ---help---
739 Use the IA-PC HPET (High Precision Event Timer) to manage
740 time in preference to the PIT and RTC, if a HPET is
741 present.
742 HPET is the next generation timer replacing legacy 8254s.
743 The HPET provides a stable time base on SMP
744 systems, unlike the TSC, but it is more expensive to access,
745 as it is off-chip. You can find the HPET spec at
746 <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100747
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100748 You can safely choose Y here. However, HPET will only be
749 activated if the platform and the BIOS support this feature.
750 Otherwise the 8254 will be used for timing services.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100751
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100752 Choose N to continue using the legacy 8254 timer.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100753
754config HPET_EMULATE_RTC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100755 def_bool y
Bernhard Walle9d8af782008-02-06 01:38:52 -0800756 depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100757
Jacob Panbb24c472009-09-02 07:37:17 -0700758config APB_TIMER
Alan Cox933b9462011-12-17 17:43:40 +0000759 def_bool y if X86_INTEL_MID
760 prompt "Intel MID APB Timer Support" if X86_INTEL_MID
Jamie Iles06c3df42011-06-06 12:43:07 +0100761 select DW_APB_TIMER
Alan Coxa0c38322011-12-17 21:57:25 +0000762 depends on X86_INTEL_MID && SFI
Jacob Panbb24c472009-09-02 07:37:17 -0700763 help
764 APB timer is the replacement for 8254, HPET on X86 MID platforms.
765 The APBT provides a stable time base on SMP
766 systems, unlike the TSC, but it is more expensive to access,
767 as it is off-chip. APB timers are always running regardless of CPU
768 C states, they are used as per CPU clockevent device when possible.
769
David Rientjes6a108a12011-01-20 14:44:16 -0800770# Mark as expert because too many people got it wrong.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100771# The code disables itself when not needed.
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700772config DMI
773 default y
Ard Biesheuvelcf074402014-01-23 15:54:39 -0800774 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
David Rientjes6a108a12011-01-20 14:44:16 -0800775 bool "Enable DMI scanning" if EXPERT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100776 ---help---
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700777 Enabled scanning of DMI to identify machine quirks. Say Y
778 here unless you have verified that your setup is not
779 affected by entries in the DMI blacklist. Required by PNP
780 BIOS code.
781
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100782config GART_IOMMU
Andi Kleen38901f12013-10-04 14:37:56 -0700783 bool "Old AMD GART IOMMU support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100784 select SWIOTLB
Andreas Herrmann23ac4ae2010-09-17 18:03:43 +0200785 depends on X86_64 && PCI && AMD_NB
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100786 ---help---
Ingo Molnarced3c422013-10-06 11:45:20 +0200787 Provides a driver for older AMD Athlon64/Opteron/Turion/Sempron
788 GART based hardware IOMMUs.
789
790 The GART supports full DMA access for devices with 32-bit access
791 limitations, on systems with more than 3 GB. This is usually needed
792 for USB, sound, many IDE/SATA chipsets and some other devices.
793
794 Newer systems typically have a modern AMD IOMMU, supported via
795 the CONFIG_AMD_IOMMU=y config option.
796
797 In normal configurations this driver is only active when needed:
798 there's more than 3 GB of memory and the system contains a
799 32-bit limited device.
800
801 If unsure, say Y.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100802
803config CALGARY_IOMMU
804 bool "IBM Calgary IOMMU support"
805 select SWIOTLB
Kees Cook6ea30382012-10-02 11:16:47 -0700806 depends on X86_64 && PCI
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100807 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100808 Support for hardware IOMMUs in IBM's xSeries x366 and x460
809 systems. Needed to run systems with more than 3GB of memory
810 properly with 32-bit PCI devices that do not support DAC
811 (Double Address Cycle). Calgary also supports bus level
812 isolation, where all DMAs pass through the IOMMU. This
813 prevents them from going anywhere except their intended
814 destination. This catches hard-to-find kernel bugs and
815 mis-behaving drivers and devices that do not use the DMA-API
816 properly to set up their DMA buffers. The IOMMU can be
817 turned off at boot time with the iommu=off parameter.
818 Normally the kernel will make the right choice by itself.
819 If unsure, say Y.
820
821config CALGARY_IOMMU_ENABLED_BY_DEFAULT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100822 def_bool y
823 prompt "Should Calgary be enabled by default?"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100824 depends on CALGARY_IOMMU
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100825 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100826 Should Calgary be enabled by default? if you choose 'y', Calgary
827 will be used (if it exists). If you choose 'n', Calgary will not be
828 used even if it exists. If you choose 'n' and would like to use
829 Calgary anyway, pass 'iommu=calgary' on the kernel command line.
830 If unsure, say Y.
831
832# need this always selected by IOMMU for the VIA workaround
833config SWIOTLB
Joerg Roedela1afd012008-11-18 12:44:21 +0100834 def_bool y if X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100835 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100836 Support for software bounce buffers used on x86-64 systems
Joe Millenbach4454d322012-09-02 17:38:20 -0700837 which don't have a hardware IOMMU. Using this PCI devices
838 which can only access 32-bits of memory can be used on systems
839 with more than 3 GB of memory.
840 If unsure, say Y.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100841
FUJITA Tomonoria8522502008-04-29 00:59:36 -0700842config IOMMU_HELPER
Jan Beulich3120e252012-09-10 12:41:45 +0100843 def_bool y
844 depends on CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700845
Mike Travis1184dc22008-05-12 21:21:12 +0200846config MAXSMP
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200847 bool "Enable Maximum number of SMP Processors and NUMA Nodes"
Kees Cook6ea30382012-10-02 11:16:47 -0700848 depends on X86_64 && SMP && DEBUG_KERNEL
Mike Travis36f51012008-12-16 17:33:51 -0800849 select CPUMASK_OFFSTACK
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100850 ---help---
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200851 Enable maximum number of CPUS and NUMA Nodes for this architecture.
Mike Travis1184dc22008-05-12 21:21:12 +0200852 If unsure, say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100853
854config NR_CPUS
Mike Travis36f51012008-12-16 17:33:51 -0800855 int "Maximum number of CPUs" if SMP && !MAXSMP
Michael K. Johnson2a3313f2009-04-21 21:44:48 -0400856 range 2 8 if SMP && X86_32 && !X86_BIGSMP
Josh Boyerbb61ccc2013-11-05 09:37:29 -0500857 range 2 512 if SMP && !MAXSMP && !CPUMASK_OFFSTACK
Josh Boyerb53b5ed2013-11-05 09:38:16 -0500858 range 2 8192 if SMP && !MAXSMP && CPUMASK_OFFSTACK && X86_64
Mike Travis78637a972008-12-16 17:34:00 -0800859 default "1" if !SMP
Josh Boyerb53b5ed2013-11-05 09:38:16 -0500860 default "8192" if MAXSMP
H. Peter Anvinb5660ba2014-02-25 12:14:06 -0800861 default "32" if SMP && X86_BIGSMP
Kirill A. Shutemovc5c19942015-05-08 13:25:45 +0300862 default "8" if SMP && X86_32
863 default "64" if SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100864 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100865 This allows you to specify the maximum number of CPUs which this
Josh Boyerbb61ccc2013-11-05 09:37:29 -0500866 kernel will support. If CPUMASK_OFFSTACK is enabled, the maximum
Kirill A. Shutemovcad14bb2015-05-08 13:25:26 +0300867 supported value is 8192, otherwise the maximum value is 512. The
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100868 minimum value which makes sense is 2.
869
870 This is purely to save memory - each supported CPU adds
871 approximately eight kilobytes to the kernel image.
872
873config SCHED_SMT
874 bool "SMT (Hyperthreading) scheduler support"
Borislav Petkovc8e56d22015-06-04 18:55:25 +0200875 depends on SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100876 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100877 SMT scheduler support improves the CPU scheduler's decision making
878 when dealing with Intel Pentium 4 chips with HyperThreading at a
879 cost of slightly increased overhead in some places. If unsure say
880 N here.
881
882config SCHED_MC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100883 def_bool y
884 prompt "Multi-core scheduler support"
Borislav Petkovc8e56d22015-06-04 18:55:25 +0200885 depends on SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100886 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100887 Multi-core scheduler support improves the CPU scheduler's decision
888 making when dealing with multi-core CPU chips at a cost of slightly
889 increased overhead in some places. If unsure say N here.
890
891source "kernel/Kconfig.preempt"
892
Thomas Gleixner30b8b002015-01-15 21:22:39 +0000893config UP_LATE_INIT
894 def_bool y
Thomas Gleixnerba360f8872015-01-24 10:34:46 +0100895 depends on !SMP && X86_LOCAL_APIC
Thomas Gleixner30b8b002015-01-15 21:22:39 +0000896
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100897config X86_UP_APIC
Jan Beulich50849ee2015-02-05 15:31:56 +0000898 bool "Local APIC support on uniprocessors" if !PCI_MSI
899 default PCI_MSI
Bryan O'Donoghue38a1dfd2015-01-22 22:58:49 +0000900 depends on X86_32 && !SMP && !X86_32_NON_STANDARD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100901 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100902 A local APIC (Advanced Programmable Interrupt Controller) is an
903 integrated interrupt controller in the CPU. If you have a single-CPU
904 system which has a processor with a local APIC, you can say Y here to
905 enable and use it. If you say Y here even though your machine doesn't
906 have a local APIC, then the kernel will still run with no slowdown at
907 all. The local APIC supports CPU-generated self-interrupts (timer,
908 performance counters), and the NMI watchdog which detects hard
909 lockups.
910
911config X86_UP_IOAPIC
912 bool "IO-APIC support on uniprocessors"
913 depends on X86_UP_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100914 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100915 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
916 SMP-capable replacement for PC-style interrupt controllers. Most
917 SMP systems and many recent uniprocessor systems have one.
918
919 If you have a single-CPU system with an IO-APIC, you can say Y here
920 to use it. If you say Y here even though your machine doesn't have
921 an IO-APIC, then the kernel will still run with no slowdown at all.
922
923config X86_LOCAL_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100924 def_bool y
Thomas Petazzoni0dbc6072013-10-03 11:59:14 +0200925 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC || PCI_MSI
Jiang Liub5dc8e62015-04-13 14:11:24 +0800926 select IRQ_DOMAIN_HIERARCHY
Jiang Liu52f518a2015-04-13 14:11:35 +0800927 select PCI_MSI_IRQ_DOMAIN if PCI_MSI
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100928
929config X86_IO_APIC
Jan Beulichb1da1e72015-02-05 15:35:21 +0000930 def_bool y
931 depends on X86_LOCAL_APIC || X86_UP_IOAPIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100932
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200933config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
934 bool "Reroute for broken boot IRQs"
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200935 depends on X86_IO_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100936 ---help---
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200937 This option enables a workaround that fixes a source of
938 spurious interrupts. This is recommended when threaded
939 interrupt handling is used on systems where the generation of
940 superfluous "boot interrupts" cannot be disabled.
941
942 Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
943 entry in the chipset's IO-APIC is masked (as, e.g. the RT
944 kernel does during interrupt handling). On chipsets where this
945 boot IRQ generation cannot be disabled, this workaround keeps
946 the original IRQ line masked so that only the equivalent "boot
947 IRQ" is delivered to the CPUs. The workaround also tells the
948 kernel to set up the IRQ handler on the boot IRQ line. In this
949 way only one interrupt is delivered to the kernel. Otherwise
950 the spurious second interrupt may cause the kernel to bring
951 down (vital) interrupt lines.
952
953 Only affects "broken" chipsets. Interrupt sharing may be
954 increased on these systems.
955
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100956config X86_MCE
Andi Kleenbab9bc62009-07-09 00:31:38 +0200957 bool "Machine Check / overheating reporting"
Borislav Petkove57dbaf2011-09-13 15:23:21 +0200958 default y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100959 ---help---
Andi Kleenbab9bc62009-07-09 00:31:38 +0200960 Machine Check support allows the processor to notify the
961 kernel if it detects a problem (e.g. overheating, data corruption).
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100962 The action the kernel takes depends on the severity of the problem,
Andi Kleenbab9bc62009-07-09 00:31:38 +0200963 ranging from warning messages to halting the machine.
Andi Kleen4efc0672009-04-28 19:07:31 +0200964
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100965config X86_MCE_INTEL
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100966 def_bool y
967 prompt "Intel MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +0200968 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100969 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100970 Additional support for intel specific MCE features such as
971 the thermal monitor.
972
973config X86_MCE_AMD
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100974 def_bool y
975 prompt "AMD MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +0200976 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100977 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100978 Additional support for AMD specific MCE features such as
979 the DRAM Error Threshold.
980
Andi Kleen4efc0672009-04-28 19:07:31 +0200981config X86_ANCIENT_MCE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100982 bool "Support for old Pentium 5 / WinChip machine checks"
Andi Kleenc31d9632009-07-09 00:31:37 +0200983 depends on X86_32 && X86_MCE
Hidetoshi Setocd13adcc2009-05-27 16:57:31 +0900984 ---help---
985 Include support for machine check handling on old Pentium 5 or WinChip
Masanari Iida5065a702013-11-30 21:38:43 +0900986 systems. These typically need to be enabled explicitly on the command
Hidetoshi Setocd13adcc2009-05-27 16:57:31 +0900987 line.
Andi Kleen4efc0672009-04-28 19:07:31 +0200988
Andi Kleenb2762682009-02-12 13:49:31 +0100989config X86_MCE_THRESHOLD
990 depends on X86_MCE_AMD || X86_MCE_INTEL
Jan Beulich6fc108a2010-04-21 15:23:44 +0100991 def_bool y
Andi Kleenb2762682009-02-12 13:49:31 +0100992
Andi Kleenea149b32009-04-29 19:31:00 +0200993config X86_MCE_INJECT
Andi Kleenc1ebf832009-07-09 00:31:41 +0200994 depends on X86_MCE
Andi Kleenea149b32009-04-29 19:31:00 +0200995 tristate "Machine check injector support"
996 ---help---
997 Provide support for injecting machine checks for testing purposes.
998 If you don't know what a machine check is and you don't do kernel
999 QA it is safe to say n.
1000
Andi Kleen4efc0672009-04-28 19:07:31 +02001001config X86_THERMAL_VECTOR
1002 def_bool y
Andi Kleen5bb38ad2009-07-09 00:31:39 +02001003 depends on X86_MCE_INTEL
Andi Kleen4efc0672009-04-28 19:07:31 +02001004
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001005config VM86
David Rientjes6a108a12011-01-20 14:44:16 -08001006 bool "Enable VM86 support" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001007 default y
1008 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001009 ---help---
H. Peter Anvin34273f42014-05-04 10:36:22 -07001010 This option is required by programs like DOSEMU to run
1011 16-bit real mode legacy code on x86 processors. It also may
1012 be needed by software like XFree86 to initialize some video
1013 cards via BIOS. Disabling this option saves about 6K.
1014
1015config X86_16BIT
1016 bool "Enable support for 16-bit segments" if EXPERT
1017 default y
1018 ---help---
1019 This option is required by programs like Wine to run 16-bit
1020 protected mode legacy code on x86 processors. Disabling
1021 this option saves about 300 bytes on i386, or around 6K text
1022 plus 16K runtime memory on x86-64,
1023
1024config X86_ESPFIX32
1025 def_bool y
1026 depends on X86_16BIT && X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001027
H. Peter Anvin197725d2014-05-04 10:00:49 -07001028config X86_ESPFIX64
1029 def_bool y
H. Peter Anvin34273f42014-05-04 10:36:22 -07001030 depends on X86_16BIT && X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001031
Andy Lutomirski1ad83c82014-10-29 14:33:47 -07001032config X86_VSYSCALL_EMULATION
1033 bool "Enable vsyscall emulation" if EXPERT
1034 default y
1035 depends on X86_64
1036 ---help---
1037 This enables emulation of the legacy vsyscall page. Disabling
1038 it is roughly equivalent to booting with vsyscall=none, except
1039 that it will also disable the helpful warning if a program
1040 tries to use a vsyscall. With this option set to N, offending
1041 programs will just segfault, citing addresses of the form
1042 0xffffffffff600?00.
1043
1044 This option is required by many programs built before 2013, and
1045 care should be used even with newer programs if set to N.
1046
1047 Disabling this option saves about 7K of kernel size and
1048 possibly 4K of additional runtime pagetable memory.
1049
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001050config TOSHIBA
1051 tristate "Toshiba Laptop support"
1052 depends on X86_32
1053 ---help---
1054 This adds a driver to safely access the System Management Mode of
1055 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
1056 not work on models with a Phoenix BIOS. The System Management Mode
1057 is used to set the BIOS and power saving options on Toshiba portables.
1058
1059 For information on utilities to make use of this driver see the
1060 Toshiba Linux utilities web site at:
1061 <http://www.buzzard.org.uk/toshiba/>.
1062
1063 Say Y if you intend to run this kernel on a Toshiba portable.
1064 Say N otherwise.
1065
1066config I8K
Pali Rohár039ae582015-05-14 13:16:37 +02001067 tristate "Dell i8k legacy laptop support"
Jean Delvare949a9d72011-05-25 20:43:33 +02001068 select HWMON
Pali Rohár039ae582015-05-14 13:16:37 +02001069 select SENSORS_DELL_SMM
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001070 ---help---
Pali Rohár039ae582015-05-14 13:16:37 +02001071 This option enables legacy /proc/i8k userspace interface in hwmon
1072 dell-smm-hwmon driver. Character file /proc/i8k reports bios version,
1073 temperature and allows controlling fan speeds of Dell laptops via
1074 System Management Mode. For old Dell laptops (like Dell Inspiron 8000)
1075 it reports also power and hotkey status. For fan speed control is
1076 needed userspace package i8kutils.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001077
Pali Rohár039ae582015-05-14 13:16:37 +02001078 Say Y if you intend to run this kernel on old Dell laptops or want to
1079 use userspace package i8kutils.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001080 Say N otherwise.
1081
1082config X86_REBOOTFIXUPS
Jan Beulich9ba16082008-10-15 22:01:38 -07001083 bool "Enable X86 board specific fixups for reboot"
1084 depends on X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001085 ---help---
1086 This enables chipset and/or board specific fixups to be done
1087 in order to get reboot to work correctly. This is only needed on
1088 some combinations of hardware and BIOS. The symptom, for which
1089 this config is intended, is when reboot ends with a stalled/hung
1090 system.
1091
1092 Currently, the only fixup is for the Geode machines using
Florian Fainelli5e3a77e2008-01-30 13:33:36 +01001093 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001094
1095 Say Y if you want to enable the fixup. Currently, it's safe to
1096 enable this option even if you don't need it.
1097 Say N otherwise.
1098
1099config MICROCODE
Borislav Petkove43f6e62012-08-01 19:17:01 +02001100 tristate "CPU microcode loading support"
Borislav Petkov80030e32013-10-13 18:36:29 +02001101 depends on CPU_SUP_AMD || CPU_SUP_INTEL
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001102 select FW_LOADER
1103 ---help---
Borislav Petkove43f6e62012-08-01 19:17:01 +02001104
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001105 If you say Y here, you will be able to update the microcode on
Peter Oruba80cc9f12008-07-28 18:44:22 +02001106 certain Intel and AMD processors. The Intel support is for the
Borislav Petkove43f6e62012-08-01 19:17:01 +02001107 IA32 family, e.g. Pentium Pro, Pentium II, Pentium III, Pentium 4,
1108 Xeon etc. The AMD support is for families 0x10 and later. You will
1109 obviously need the actual microcode binary data itself which is not
1110 shipped with the Linux kernel.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001111
Peter Oruba8d86f392008-07-28 18:44:21 +02001112 This option selects the general module only, you need to select
1113 at least one vendor specific module as well.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001114
Borislav Petkove43f6e62012-08-01 19:17:01 +02001115 To compile this driver as a module, choose M here: the module
1116 will be called microcode.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001117
Peter Oruba8d86f392008-07-28 18:44:21 +02001118config MICROCODE_INTEL
Borislav Petkove43f6e62012-08-01 19:17:01 +02001119 bool "Intel microcode loading support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001120 depends on MICROCODE
1121 default MICROCODE
1122 select FW_LOADER
1123 ---help---
1124 This options enables microcode patch loading support for Intel
1125 processors.
Peter Oruba8d86f392008-07-28 18:44:21 +02001126
Alanb8989db2014-01-20 18:01:56 +00001127 For the current Intel microcode data package go to
1128 <https://downloadcenter.intel.com> and search for
1129 'Linux Processor Microcode Data File'.
Peter Oruba8d86f392008-07-28 18:44:21 +02001130
Peter Oruba80cc9f12008-07-28 18:44:22 +02001131config MICROCODE_AMD
Borislav Petkove43f6e62012-08-01 19:17:01 +02001132 bool "AMD microcode loading support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001133 depends on MICROCODE
1134 select FW_LOADER
1135 ---help---
1136 If you select this option, microcode patch loading support for AMD
1137 processors will be enabled.
Peter Oruba80cc9f12008-07-28 18:44:22 +02001138
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001139config MICROCODE_OLD_INTERFACE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001140 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001141 depends on MICROCODE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001142
Fenghua Yuda76f642012-12-20 23:44:32 -08001143config MICROCODE_INTEL_EARLY
Jan Beuliche0fd24a2015-02-05 15:39:34 +00001144 bool
Jacob Shin757885e2013-05-30 14:09:19 -05001145
1146config MICROCODE_AMD_EARLY
Jan Beuliche0fd24a2015-02-05 15:39:34 +00001147 bool
Jacob Shin757885e2013-05-30 14:09:19 -05001148
1149config MICROCODE_EARLY
Fenghua Yuda76f642012-12-20 23:44:32 -08001150 bool "Early load microcode"
Jacob Shin6b3389a2013-05-31 01:53:24 -05001151 depends on MICROCODE=y && BLK_DEV_INITRD
Jacob Shin757885e2013-05-30 14:09:19 -05001152 select MICROCODE_INTEL_EARLY if MICROCODE_INTEL
1153 select MICROCODE_AMD_EARLY if MICROCODE_AMD
Fenghua Yuda76f642012-12-20 23:44:32 -08001154 default y
1155 help
1156 This option provides functionality to read additional microcode data
1157 at the beginning of initrd image. The data tells kernel to load
1158 microcode to CPU's as early as possible. No functional change if no
1159 microcode data is glued to the initrd, therefore it's safe to say Y.
1160
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001161config X86_MSR
1162 tristate "/dev/cpu/*/msr - Model-specific register support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001163 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001164 This device gives privileged processes access to the x86
1165 Model-Specific Registers (MSRs). It is a character device with
1166 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
1167 MSR accesses are directed to a specific CPU on multi-processor
1168 systems.
1169
1170config X86_CPUID
1171 tristate "/dev/cpu/*/cpuid - CPU information support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001172 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001173 This device gives processes access to the x86 CPUID instruction to
1174 be executed on a specific processor. It is a character device
1175 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
1176 /dev/cpu/31/cpuid.
1177
1178choice
1179 prompt "High Memory Support"
Jan Beulich6fc108a2010-04-21 15:23:44 +01001180 default HIGHMEM4G
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001181 depends on X86_32
1182
1183config NOHIGHMEM
1184 bool "off"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001185 ---help---
1186 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
1187 However, the address space of 32-bit x86 processors is only 4
1188 Gigabytes large. That means that, if you have a large amount of
1189 physical memory, not all of it can be "permanently mapped" by the
1190 kernel. The physical memory that's not permanently mapped is called
1191 "high memory".
1192
1193 If you are compiling a kernel which will never run on a machine with
1194 more than 1 Gigabyte total physical RAM, answer "off" here (default
1195 choice and suitable for most users). This will result in a "3GB/1GB"
1196 split: 3GB are mapped so that each process sees a 3GB virtual memory
1197 space and the remaining part of the 4GB virtual memory space is used
1198 by the kernel to permanently map as much physical memory as
1199 possible.
1200
1201 If the machine has between 1 and 4 Gigabytes physical RAM, then
1202 answer "4GB" here.
1203
1204 If more than 4 Gigabytes is used then answer "64GB" here. This
1205 selection turns Intel PAE (Physical Address Extension) mode on.
1206 PAE implements 3-level paging on IA32 processors. PAE is fully
1207 supported by Linux, PAE mode is implemented on all recent Intel
1208 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
1209 then the kernel will not boot on CPUs that don't support PAE!
1210
1211 The actual amount of total physical memory will either be
1212 auto detected or can be forced by using a kernel command line option
1213 such as "mem=256M". (Try "man bootparam" or see the documentation of
1214 your boot loader (lilo or loadlin) about how to pass options to the
1215 kernel at boot time.)
1216
1217 If unsure, say "off".
1218
1219config HIGHMEM4G
1220 bool "4GB"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001221 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001222 Select this if you have a 32-bit processor and between 1 and 4
1223 gigabytes of physical RAM.
1224
1225config HIGHMEM64G
1226 bool "64GB"
H. Peter Anvineb068e72012-11-28 11:50:23 -08001227 depends on !M486
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001228 select X86_PAE
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001229 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001230 Select this if you have a 32-bit processor and more than 4
1231 gigabytes of physical RAM.
1232
1233endchoice
1234
1235choice
David Rientjes6a108a12011-01-20 14:44:16 -08001236 prompt "Memory split" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001237 default VMSPLIT_3G
1238 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001239 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001240 Select the desired split between kernel and user memory.
1241
1242 If the address range available to the kernel is less than the
1243 physical memory installed, the remaining memory will be available
1244 as "high memory". Accessing high memory is a little more costly
1245 than low memory, as it needs to be mapped into the kernel first.
1246 Note that increasing the kernel address space limits the range
1247 available to user programs, making the address space there
1248 tighter. Selecting anything other than the default 3G/1G split
1249 will also likely make your kernel incompatible with binary-only
1250 kernel modules.
1251
1252 If you are not absolutely sure what you are doing, leave this
1253 option alone!
1254
1255 config VMSPLIT_3G
1256 bool "3G/1G user/kernel split"
1257 config VMSPLIT_3G_OPT
1258 depends on !X86_PAE
1259 bool "3G/1G user/kernel split (for full 1G low memory)"
1260 config VMSPLIT_2G
1261 bool "2G/2G user/kernel split"
1262 config VMSPLIT_2G_OPT
1263 depends on !X86_PAE
1264 bool "2G/2G user/kernel split (for full 2G low memory)"
1265 config VMSPLIT_1G
1266 bool "1G/3G user/kernel split"
1267endchoice
1268
1269config PAGE_OFFSET
1270 hex
1271 default 0xB0000000 if VMSPLIT_3G_OPT
1272 default 0x80000000 if VMSPLIT_2G
1273 default 0x78000000 if VMSPLIT_2G_OPT
1274 default 0x40000000 if VMSPLIT_1G
1275 default 0xC0000000
1276 depends on X86_32
1277
1278config HIGHMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001279 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001280 depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001281
1282config X86_PAE
Jan Beulich9ba16082008-10-15 22:01:38 -07001283 bool "PAE (Physical Address Extension) Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001284 depends on X86_32 && !HIGHMEM4G
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001285 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001286 PAE is required for NX support, and furthermore enables
1287 larger swapspace support for non-overcommit purposes. It
1288 has the cost of more pagetable lookup overhead, and also
1289 consumes more pagetable space per process.
1290
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001291config ARCH_PHYS_ADDR_T_64BIT
Jan Beulich3120e252012-09-10 12:41:45 +01001292 def_bool y
1293 depends on X86_64 || X86_PAE
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001294
FUJITA Tomonori66f2b062010-10-20 15:55:35 -07001295config ARCH_DMA_ADDR_T_64BIT
Jan Beulich3120e252012-09-10 12:41:45 +01001296 def_bool y
1297 depends on X86_64 || HIGHMEM64G
FUJITA Tomonori66f2b062010-10-20 15:55:35 -07001298
Ingo Molnar10971ab2015-03-05 08:18:23 +01001299config X86_DIRECT_GBPAGES
Luis R. Rodrigueze5008ab2015-03-04 17:24:12 -08001300 def_bool y
1301 depends on X86_64 && !DEBUG_PAGEALLOC && !KMEMCHECK
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001302 ---help---
Ingo Molnar10971ab2015-03-05 08:18:23 +01001303 Certain kernel features effectively disable kernel
1304 linear 1 GB mappings (even if the CPU otherwise
1305 supports them), so don't confuse the user by printing
1306 that we have them enabled.
Nick Piggin9e899812008-10-22 12:33:16 +02001307
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001308# Common NUMA Features
1309config NUMA
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001310 bool "Numa Memory Allocation and Scheduler Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001311 depends on SMP
H. Peter Anvinb5660ba2014-02-25 12:14:06 -08001312 depends on X86_64 || (X86_32 && HIGHMEM64G && X86_BIGSMP)
1313 default y if X86_BIGSMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001314 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001315 Enable NUMA (Non Uniform Memory Access) support.
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001316
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001317 The kernel will try to allocate memory used by a CPU on the
1318 local memory controller of the CPU and add some more
1319 NUMA awareness to the kernel.
1320
Ingo Molnarc280ea52008-11-08 13:29:45 +01001321 For 64-bit this is recommended if the system is Intel Core i7
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001322 (or later), AMD Opteron, or EM64T NUMA.
1323
H. Peter Anvinb5660ba2014-02-25 12:14:06 -08001324 For 32-bit this is only needed if you boot a 32-bit
David Rientjes7cf6c942014-02-11 18:11:13 -08001325 kernel on a 64-bit NUMA platform.
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001326
1327 Otherwise, you should say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001328
Hans Rosenfeldeec1d4f2010-10-29 17:14:30 +02001329config AMD_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001330 def_bool y
1331 prompt "Old style AMD Opteron NUMA detection"
Tejun Heo5da0ef92011-07-11 10:34:32 +02001332 depends on X86_64 && NUMA && PCI
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001333 ---help---
Hans Rosenfeldeec1d4f2010-10-29 17:14:30 +02001334 Enable AMD NUMA node topology detection. You should say Y here if
1335 you have a multi processor AMD system. This uses an old method to
1336 read the NUMA configuration directly from the builtin Northbridge
1337 of Opteron. It is recommended to use X86_64_ACPI_NUMA instead,
1338 which also takes priority if both are compiled in.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001339
1340config X86_64_ACPI_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001341 def_bool y
1342 prompt "ACPI NUMA detection"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001343 depends on X86_64 && NUMA && ACPI && PCI
1344 select ACPI_NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001345 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001346 Enable ACPI SRAT based node topology detection.
1347
Suresh Siddha6ec6e0d2008-03-25 10:14:35 -07001348# Some NUMA nodes have memory ranges that span
1349# other nodes. Even though a pfn is valid and
1350# between a node's start and end pfns, it may not
1351# reside on that node. See memmap_init_zone()
1352# for details.
1353config NODES_SPAN_OTHER_NODES
1354 def_bool y
1355 depends on X86_64_ACPI_NUMA
1356
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001357config NUMA_EMU
1358 bool "NUMA emulation"
Tejun Heo1b7e03e2011-05-02 17:24:48 +02001359 depends on NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001360 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001361 Enable NUMA emulation. A flat machine will be split
1362 into virtual nodes when booted with "numa=fake=N", where N is the
1363 number of nodes. This is only useful for debugging.
1364
1365config NODES_SHIFT
Linus Torvaldsd25e26b2008-08-25 14:15:38 -07001366 int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
David Rientjes51591e32010-03-25 15:39:27 -07001367 range 1 10
1368 default "10" if MAXSMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001369 default "6" if X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001370 default "3"
1371 depends on NEED_MULTIPLE_NODES
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001372 ---help---
Mike Travis1184dc22008-05-12 21:21:12 +02001373 Specify the maximum number of NUMA Nodes available on the target
Matt LaPlante692105b2009-01-26 11:12:25 +01001374 system. Increases memory reserved to accommodate various tables.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001375
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001376config ARCH_HAVE_MEMORY_PRESENT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001377 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001378 depends on X86_32 && DISCONTIGMEM
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001379
1380config NEED_NODE_MEMMAP_SIZE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001381 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001382 depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001383
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001384config ARCH_FLATMEM_ENABLE
1385 def_bool y
Tejun Heo3b166512011-04-01 11:15:12 +02001386 depends on X86_32 && !NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001387
1388config ARCH_DISCONTIGMEM_ENABLE
1389 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001390 depends on NUMA && X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001391
1392config ARCH_DISCONTIGMEM_DEFAULT
1393 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001394 depends on NUMA && X86_32
1395
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001396config ARCH_SPARSEMEM_ENABLE
1397 def_bool y
Kees Cook6ea30382012-10-02 11:16:47 -07001398 depends on X86_64 || NUMA || X86_32 || X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001399 select SPARSEMEM_STATIC if X86_32
1400 select SPARSEMEM_VMEMMAP_ENABLE if X86_64
1401
Tejun Heo3b166512011-04-01 11:15:12 +02001402config ARCH_SPARSEMEM_DEFAULT
1403 def_bool y
1404 depends on X86_64
1405
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001406config ARCH_SELECT_MEMORY_MODEL
1407 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001408 depends on ARCH_SPARSEMEM_ENABLE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001409
1410config ARCH_MEMORY_PROBE
Toshi Kania0842b72013-07-19 11:47:48 -06001411 bool "Enable sysfs memory/probe interface"
Jan Beulich3120e252012-09-10 12:41:45 +01001412 depends on X86_64 && MEMORY_HOTPLUG
Toshi Kania0842b72013-07-19 11:47:48 -06001413 help
1414 This option enables a sysfs memory/probe interface for testing.
1415 See Documentation/memory-hotplug.txt for more information.
1416 If you are unsure how to answer this question, answer N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001417
Tejun Heo3b166512011-04-01 11:15:12 +02001418config ARCH_PROC_KCORE_TEXT
1419 def_bool y
1420 depends on X86_64 && PROC_KCORE
1421
Avi Kivitya29815a2010-01-10 16:28:09 +02001422config ILLEGAL_POINTER_VALUE
1423 hex
1424 default 0 if X86_32
1425 default 0xdead000000000000 if X86_64
1426
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001427source "mm/Kconfig"
1428
Christoph Hellwigec776ef2015-04-01 09:12:18 +02001429config X86_PMEM_LEGACY
1430 bool "Support non-standard NVDIMMs and ADR protected memory"
Dan Williams9f53f9f2015-06-09 15:33:45 -04001431 depends on PHYS_ADDR_T_64BIT
1432 depends on BLK_DEV
1433 select LIBNVDIMM
Christoph Hellwigec776ef2015-04-01 09:12:18 +02001434 help
1435 Treat memory marked using the non-standard e820 type of 12 as used
1436 by the Intel Sandy Bridge-EP reference BIOS as protected memory.
1437 The kernel will offer these regions to the 'pmem' driver so
1438 they can be used for persistent storage.
1439
1440 Say Y if unsure.
1441
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001442config HIGHPTE
1443 bool "Allocate 3rd-level pagetables from highmem"
Jan Beulich6fc108a2010-04-21 15:23:44 +01001444 depends on HIGHMEM
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001445 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001446 The VM uses one page table entry for each page of physical memory.
1447 For systems with a lot of RAM, this can be wasteful of precious
1448 low memory. Setting this option will put user-space page table
1449 entries in high memory.
1450
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001451config X86_CHECK_BIOS_CORRUPTION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001452 bool "Check for low memory corruption"
1453 ---help---
1454 Periodically check for memory corruption in low memory, which
1455 is suspected to be caused by BIOS. Even when enabled in the
1456 configuration, it is disabled at runtime. Enable it by
1457 setting "memory_corruption_check=1" on the kernel command
1458 line. By default it scans the low 64k of memory every 60
1459 seconds; see the memory_corruption_check_size and
1460 memory_corruption_check_period parameters in
1461 Documentation/kernel-parameters.txt to adjust this.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001462
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001463 When enabled with the default parameters, this option has
1464 almost no overhead, as it reserves a relatively small amount
1465 of memory and scans it infrequently. It both detects corruption
1466 and prevents it from affecting the running system.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001467
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001468 It is, however, intended as a diagnostic tool; if repeatable
1469 BIOS-originated corruption always affects the same memory,
1470 you can use memmap= to prevent the kernel from using that
1471 memory.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001472
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001473config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001474 bool "Set the default setting of memory_corruption_check"
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001475 depends on X86_CHECK_BIOS_CORRUPTION
1476 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001477 ---help---
1478 Set whether the default state of memory_corruption_check is
1479 on or off.
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001480
H. Peter Anvin9ea77bd2010-08-25 16:38:20 -07001481config X86_RESERVE_LOW
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001482 int "Amount of low memory, in kilobytes, to reserve for the BIOS"
1483 default 64
1484 range 4 640
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001485 ---help---
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001486 Specify the amount of low memory to reserve for the BIOS.
Ingo Molnarfc381512008-09-16 10:07:34 +02001487
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001488 The first page contains BIOS data structures that the kernel
1489 must not use, so that page must always be reserved.
Ingo Molnarfc381512008-09-16 10:07:34 +02001490
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001491 By default we reserve the first 64K of physical RAM, as a
1492 number of BIOSes are known to corrupt that memory range
1493 during events such as suspend/resume or monitor cable
1494 insertion, so it must not be used by the kernel.
Ingo Molnarfc381512008-09-16 10:07:34 +02001495
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001496 You can set this to 4 if you are absolutely sure that you
1497 trust the BIOS to get all its memory reservations and usages
1498 right. If you know your BIOS have problems beyond the
1499 default 64K area, you can set this to 640 to avoid using the
1500 entire low memory range.
1501
1502 If you have doubts about the BIOS (e.g. suspend/resume does
1503 not work or there's kernel crashes after certain hardware
1504 hotplug events) then you might want to enable
1505 X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check
1506 typical corruption patterns.
1507
1508 Leave this to the default value of 64 if you are unsure.
Ingo Molnarfc381512008-09-16 10:07:34 +02001509
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001510config MATH_EMULATION
1511 bool
1512 prompt "Math emulation" if X86_32
1513 ---help---
1514 Linux can emulate a math coprocessor (used for floating point
1515 operations) if you don't have one. 486DX and Pentium processors have
1516 a math coprocessor built in, 486SX and 386 do not, unless you added
1517 a 487DX or 387, respectively. (The messages during boot time can
1518 give you some hints here ["man dmesg"].) Everyone needs either a
1519 coprocessor or this emulation.
1520
1521 If you don't have a math coprocessor, you need to say Y here; if you
1522 say Y here even though you have a coprocessor, the coprocessor will
1523 be used nevertheless. (This behavior can be changed with the kernel
1524 command line option "no387", which comes handy if your coprocessor
1525 is broken. Try "man bootparam" or see the documentation of your boot
1526 loader (lilo or loadlin) about how to pass options to the kernel at
1527 boot time.) This means that it is a good idea to say Y here if you
1528 intend to use this kernel on different machines.
1529
1530 More information about the internals of the Linux math coprocessor
1531 emulation can be found in <file:arch/x86/math-emu/README>.
1532
1533 If you are not sure, say Y; apart from resulting in a 66 KB bigger
1534 kernel, it won't hurt.
1535
1536config MTRR
Jan Beulich6fc108a2010-04-21 15:23:44 +01001537 def_bool y
David Rientjes6a108a12011-01-20 14:44:16 -08001538 prompt "MTRR (Memory Type Range Register) support" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001539 ---help---
1540 On Intel P6 family processors (Pentium Pro, Pentium II and later)
1541 the Memory Type Range Registers (MTRRs) may be used to control
1542 processor access to memory ranges. This is most useful if you have
1543 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
1544 allows bus write transfers to be combined into a larger transfer
1545 before bursting over the PCI/AGP bus. This can increase performance
1546 of image write operations 2.5 times or more. Saying Y here creates a
1547 /proc/mtrr file which may be used to manipulate your processor's
1548 MTRRs. Typically the X server should use this.
1549
1550 This code has a reasonably generic interface so that similar
1551 control registers on other processors can be easily supported
1552 as well:
1553
1554 The Cyrix 6x86, 6x86MX and M II processors have Address Range
1555 Registers (ARRs) which provide a similar functionality to MTRRs. For
1556 these, the ARRs are used to emulate the MTRRs.
1557 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
1558 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
1559 write-combining. All of these processors are supported by this code
1560 and it makes sense to say Y here if you have one of them.
1561
1562 Saying Y here also fixes a problem with buggy SMP BIOSes which only
1563 set the MTRRs for the boot CPU and not for the secondary CPUs. This
1564 can lead to all sorts of problems, so it's good to say Y here.
1565
1566 You can safely say Y even if your machine doesn't have MTRRs, you'll
1567 just add about 9 KB to your kernel.
1568
Randy Dunlap7225e752008-07-26 17:54:22 -07001569 See <file:Documentation/x86/mtrr.txt> for more information.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001570
Yinghai Lu95ffa242008-04-29 03:52:33 -07001571config MTRR_SANITIZER
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001572 def_bool y
Yinghai Lu95ffa242008-04-29 03:52:33 -07001573 prompt "MTRR cleanup support"
1574 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001575 ---help---
Thomas Gleixneraba37282008-07-15 14:48:48 +02001576 Convert MTRR layout from continuous to discrete, so X drivers can
1577 add writeback entries.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001578
Thomas Gleixneraba37282008-07-15 14:48:48 +02001579 Can be disabled with disable_mtrr_cleanup on the kernel command line.
Matt LaPlante692105b2009-01-26 11:12:25 +01001580 The largest mtrr entry size for a continuous block can be set with
Thomas Gleixneraba37282008-07-15 14:48:48 +02001581 mtrr_chunk_size.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001582
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001583 If unsure, say Y.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001584
1585config MTRR_SANITIZER_ENABLE_DEFAULT
Yinghai Luf5098d62008-04-29 20:25:58 -07001586 int "MTRR cleanup enable value (0-1)"
1587 range 0 1
1588 default "0"
Yinghai Lu95ffa242008-04-29 03:52:33 -07001589 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001590 ---help---
Yinghai Luf5098d62008-04-29 20:25:58 -07001591 Enable mtrr cleanup default value
Yinghai Lu95ffa242008-04-29 03:52:33 -07001592
Yinghai Lu12031a62008-05-02 02:40:22 -07001593config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
1594 int "MTRR cleanup spare reg num (0-7)"
1595 range 0 7
1596 default "1"
1597 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001598 ---help---
Yinghai Lu12031a62008-05-02 02:40:22 -07001599 mtrr cleanup spare entries default, it can be changed via
Thomas Gleixneraba37282008-07-15 14:48:48 +02001600 mtrr_spare_reg_nr=N on the kernel command line.
Yinghai Lu12031a62008-05-02 02:40:22 -07001601
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001602config X86_PAT
Jan Beulich6fc108a2010-04-21 15:23:44 +01001603 def_bool y
David Rientjes6a108a12011-01-20 14:44:16 -08001604 prompt "x86 PAT support" if EXPERT
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001605 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001606 ---help---
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001607 Use PAT attributes to setup page level cache control.
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001608
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001609 PATs are the modern equivalents of MTRRs and are much more
1610 flexible than MTRRs.
1611
1612 Say N here if you see bootup problems (boot crash, boot hang,
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001613 spontaneous reboots) or a non-working video driver.
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001614
1615 If unsure, say Y.
1616
Venkatesh Pallipadi46cf98c2009-07-10 09:57:37 -07001617config ARCH_USES_PG_UNCACHED
1618 def_bool y
1619 depends on X86_PAT
1620
H. Peter Anvin628c6242011-07-31 13:59:29 -07001621config ARCH_RANDOM
1622 def_bool y
1623 prompt "x86 architectural random number generator" if EXPERT
1624 ---help---
1625 Enable the x86 architectural RDRAND instruction
1626 (Intel Bull Mountain technology) to generate random numbers.
1627 If supported, this is a high bandwidth, cryptographically
1628 secure hardware random number generator.
1629
H. Peter Anvin51ae4a22012-09-21 12:43:10 -07001630config X86_SMAP
1631 def_bool y
1632 prompt "Supervisor Mode Access Prevention" if EXPERT
1633 ---help---
1634 Supervisor Mode Access Prevention (SMAP) is a security
1635 feature in newer Intel processors. There is a small
1636 performance cost if this enabled and turned on; there is
1637 also a small increase in the kernel size if this is enabled.
1638
1639 If unsure, say Y.
1640
Dave Hansen72e9b5f2014-12-12 10:38:36 -08001641config X86_INTEL_MPX
1642 prompt "Intel MPX (Memory Protection Extensions)"
1643 def_bool n
1644 depends on CPU_SUP_INTEL
1645 ---help---
1646 MPX provides hardware features that can be used in
1647 conjunction with compiler-instrumented code to check
1648 memory references. It is designed to detect buffer
1649 overflow or underflow bugs.
1650
1651 This option enables running applications which are
1652 instrumented or otherwise use MPX. It does not use MPX
1653 itself inside the kernel or to protect the kernel
1654 against bad memory references.
1655
1656 Enabling this option will make the kernel larger:
1657 ~8k of kernel text and 36 bytes of data on a 64-bit
1658 defconfig. It adds a long to the 'mm_struct' which
1659 will increase the kernel memory overhead of each
1660 process and adds some branches to paths used during
1661 exec() and munmap().
1662
1663 For details, see Documentation/x86/intel_mpx.txt
1664
1665 If unsure, say N.
1666
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001667config EFI
Jan Beulich9ba16082008-10-15 22:01:38 -07001668 bool "EFI runtime service support"
Huang, Ying5b836832008-01-30 13:31:19 +01001669 depends on ACPI
Sergey Vlasovf6ce5002013-04-16 18:31:08 +04001670 select UCS2_STRING
Ard Biesheuvel022ee6c2014-06-26 12:09:05 +02001671 select EFI_RUNTIME_WRAPPERS
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001672 ---help---
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001673 This enables the kernel to use EFI runtime services that are
1674 available (such as the EFI variable services).
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001675
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001676 This option is only useful on systems that have EFI firmware.
1677 In addition, you should use the latest ELILO loader available
1678 at <http://elilo.sourceforge.net> in order to take advantage
1679 of EFI runtime services. However, even with this option, the
1680 resultant kernel should continue to boot on existing non-EFI
1681 platforms.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001682
Matt Fleming291f3632011-12-12 21:27:52 +00001683config EFI_STUB
1684 bool "EFI stub support"
Matt Flemingb16d8c22014-08-05 00:12:19 +01001685 depends on EFI && !X86_USE_3DNOW
Matt Fleming7b2a5832014-07-11 08:45:25 +01001686 select RELOCATABLE
Matt Fleming291f3632011-12-12 21:27:52 +00001687 ---help---
1688 This kernel feature allows a bzImage to be loaded directly
1689 by EFI firmware without the use of a bootloader.
1690
Roy Franz4172fe22013-09-22 15:45:25 -07001691 See Documentation/efi-stub.txt for more information.
Matt Fleming0c759662012-03-16 12:03:13 +00001692
Matt Fleming7d453ee2014-01-10 18:52:06 +00001693config EFI_MIXED
1694 bool "EFI mixed-mode support"
1695 depends on EFI_STUB && X86_64
1696 ---help---
1697 Enabling this feature allows a 64-bit kernel to be booted
1698 on a 32-bit firmware, provided that your CPU supports 64-bit
1699 mode.
1700
1701 Note that it is not possible to boot a mixed-mode enabled
1702 kernel via the EFI boot stub - a bootloader that supports
1703 the EFI handover protocol must be used.
1704
1705 If unsure, say N.
1706
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001707config SECCOMP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001708 def_bool y
1709 prompt "Enable seccomp to safely compute untrusted bytecode"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001710 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001711 This kernel feature is useful for number crunching applications
1712 that may need to compute untrusted bytecode during their
1713 execution. By using pipes or other transports made available to
1714 the process as file descriptors supporting the read/write
1715 syscalls, it's possible to isolate those applications in
1716 their own address space using seccomp. Once seccomp is
Alexey Dobriyan9c0bbee2008-09-09 11:01:31 +04001717 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001718 and the task is only allowed to execute a few safe syscalls
1719 defined by each seccomp mode.
1720
1721 If unsure, say Y. Only embedded should say N here.
1722
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001723source kernel/Kconfig.hz
1724
1725config KEXEC
1726 bool "kexec system call"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001727 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001728 kexec is a system call that implements the ability to shutdown your
1729 current kernel, and to start another kernel. It is like a reboot
1730 but it is independent of the system firmware. And like a reboot
1731 you can start any kernel with it, not just Linux.
1732
1733 The name comes from the similarity to the exec system call.
1734
1735 It is an ongoing process to be certain the hardware in a machine
1736 is properly shutdown, so do not be surprised if this code does not
Geert Uytterhoevenbf220692013-08-20 21:38:03 +02001737 initially work for you. As of this writing the exact hardware
1738 interface is strongly in flux, so no good recommendation can be
1739 made.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001740
Vivek Goyal74ca3172014-08-29 15:18:46 -07001741config KEXEC_FILE
1742 bool "kexec file based system call"
1743 select BUILD_BIN2C
1744 depends on KEXEC
1745 depends on X86_64
1746 depends on CRYPTO=y
1747 depends on CRYPTO_SHA256=y
1748 ---help---
1749 This is new version of kexec system call. This system call is
1750 file based and takes file descriptors as system call argument
1751 for kernel and initramfs as opposed to list of segments as
1752 accepted by previous system call.
1753
Vivek Goyal8e7d8382014-08-08 14:26:13 -07001754config KEXEC_VERIFY_SIG
1755 bool "Verify kernel signature during kexec_file_load() syscall"
Vivek Goyal74ca3172014-08-29 15:18:46 -07001756 depends on KEXEC_FILE
Vivek Goyal8e7d8382014-08-08 14:26:13 -07001757 ---help---
1758 This option makes kernel signature verification mandatory for
Borislav Petkovd8eb8942015-03-13 14:04:37 +01001759 the kexec_file_load() syscall.
Vivek Goyal8e7d8382014-08-08 14:26:13 -07001760
Borislav Petkovd8eb8942015-03-13 14:04:37 +01001761 In addition to that option, you need to enable signature
1762 verification for the corresponding kernel image type being
1763 loaded in order for this to work.
Vivek Goyal8e7d8382014-08-08 14:26:13 -07001764
1765config KEXEC_BZIMAGE_VERIFY_SIG
1766 bool "Enable bzImage signature verification support"
1767 depends on KEXEC_VERIFY_SIG
1768 depends on SIGNED_PE_FILE_VERIFICATION
1769 select SYSTEM_TRUSTED_KEYRING
1770 ---help---
1771 Enable bzImage signature verification support.
1772
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001773config CRASH_DUMP
Pavel Machek04b69442008-08-14 17:16:50 +02001774 bool "kernel crash dumps"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001775 depends on X86_64 || (X86_32 && HIGHMEM)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001776 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001777 Generate crash dump after being started by kexec.
1778 This should be normally only set in special crash dump kernels
1779 which are loaded in the main kernel with kexec-tools into
1780 a specially reserved region and then later executed after
1781 a crash by kdump/kexec. The crash dump kernel must be compiled
1782 to a memory address not used by the main kernel or BIOS using
1783 PHYSICAL_START, or it must be built as a relocatable image
1784 (CONFIG_RELOCATABLE=y).
1785 For more details see Documentation/kdump/kdump.txt
1786
Huang Ying3ab83522008-07-25 19:45:07 -07001787config KEXEC_JUMP
Kees Cook6ea30382012-10-02 11:16:47 -07001788 bool "kexec jump"
Huang Yingfee7b0d2009-03-10 10:57:16 +08001789 depends on KEXEC && HIBERNATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001790 ---help---
Huang Ying89081d12008-07-25 19:45:10 -07001791 Jump between original kernel and kexeced kernel and invoke
1792 code in physical address mode via KEXEC
Huang Ying3ab83522008-07-25 19:45:07 -07001793
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001794config PHYSICAL_START
David Rientjes6a108a12011-01-20 14:44:16 -08001795 hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP)
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001796 default "0x1000000"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001797 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001798 This gives the physical address where the kernel is loaded.
1799
1800 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
1801 bzImage will decompress itself to above physical address and
1802 run from there. Otherwise, bzImage will run from the address where
1803 it has been loaded by the boot loader and will ignore above physical
1804 address.
1805
1806 In normal kdump cases one does not have to set/change this option
1807 as now bzImage can be compiled as a completely relocatable image
1808 (CONFIG_RELOCATABLE=y) and be used to load and run from a different
1809 address. This option is mainly useful for the folks who don't want
1810 to use a bzImage for capturing the crash dump and want to use a
1811 vmlinux instead. vmlinux is not relocatable hence a kernel needs
1812 to be specifically compiled to run from a specific memory area
1813 (normally a reserved region) and this option comes handy.
1814
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001815 So if you are using bzImage for capturing the crash dump,
1816 leave the value here unchanged to 0x1000000 and set
1817 CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux
1818 for capturing the crash dump change this value to start of
1819 the reserved region. In other words, it can be set based on
1820 the "X" value as specified in the "crashkernel=YM@XM"
1821 command line boot parameter passed to the panic-ed
1822 kernel. Please take a look at Documentation/kdump/kdump.txt
1823 for more details about crash dumps.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001824
1825 Usage of bzImage for capturing the crash dump is recommended as
1826 one does not have to build two kernels. Same kernel can be used
1827 as production kernel and capture kernel. Above option should have
1828 gone away after relocatable bzImage support is introduced. But it
1829 is present because there are users out there who continue to use
1830 vmlinux for dump capture. This option should go away down the
1831 line.
1832
1833 Don't change this unless you know what you are doing.
1834
1835config RELOCATABLE
H. Peter Anvin26717802009-05-07 14:19:34 -07001836 bool "Build a relocatable kernel"
1837 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001838 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001839 This builds a kernel image that retains relocation information
1840 so it can be loaded someplace besides the default 1MB.
1841 The relocations tend to make the kernel binary about 10% larger,
1842 but are discarded at runtime.
1843
1844 One use is for the kexec on panic case where the recovery kernel
1845 must live at a different physical address than the primary
1846 kernel.
1847
1848 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
1849 it has been loaded at and the compile time physical address
Kees Cook8ab38202013-10-10 17:18:14 -07001850 (CONFIG_PHYSICAL_START) is used as the minimum location.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001851
Kees Cook8ab38202013-10-10 17:18:14 -07001852config RANDOMIZE_BASE
1853 bool "Randomize the address of the kernel image"
1854 depends on RELOCATABLE
Kees Cook8ab38202013-10-10 17:18:14 -07001855 default n
1856 ---help---
1857 Randomizes the physical and virtual address at which the
1858 kernel image is decompressed, as a security feature that
1859 deters exploit attempts relying on knowledge of the location
1860 of kernel internals.
1861
Kees Cooka653f352013-11-11 14:28:39 -08001862 Entropy is generated using the RDRAND instruction if it is
1863 supported. If RDTSC is supported, it is used as well. If
1864 neither RDRAND nor RDTSC are supported, then randomness is
1865 read from the i8254 timer.
Kees Cook8ab38202013-10-10 17:18:14 -07001866
1867 The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET,
Kees Cooka653f352013-11-11 14:28:39 -08001868 and aligned according to PHYSICAL_ALIGN. Since the kernel is
1869 built using 2GiB addressing, and PHYSICAL_ALGIN must be at a
1870 minimum of 2MiB, only 10 bits of entropy is theoretically
1871 possible. At best, due to page table layouts, 64-bit can use
1872 9 bits of entropy and 32-bit uses 8 bits.
Kees Cook8ab38202013-10-10 17:18:14 -07001873
Kees Cookda2b6fb2013-12-10 12:27:45 -08001874 If unsure, say N.
1875
Kees Cook8ab38202013-10-10 17:18:14 -07001876config RANDOMIZE_BASE_MAX_OFFSET
Kees Cookda2b6fb2013-12-10 12:27:45 -08001877 hex "Maximum kASLR offset allowed" if EXPERT
Kees Cook8ab38202013-10-10 17:18:14 -07001878 depends on RANDOMIZE_BASE
Kees Cook6145cfe2013-10-10 17:18:18 -07001879 range 0x0 0x20000000 if X86_32
1880 default "0x20000000" if X86_32
1881 range 0x0 0x40000000 if X86_64
1882 default "0x40000000" if X86_64
Kees Cook8ab38202013-10-10 17:18:14 -07001883 ---help---
Kees Cookda2b6fb2013-12-10 12:27:45 -08001884 The lesser of RANDOMIZE_BASE_MAX_OFFSET and available physical
1885 memory is used to determine the maximal offset in bytes that will
1886 be applied to the kernel when kernel Address Space Layout
1887 Randomization (kASLR) is active. This must be a multiple of
1888 PHYSICAL_ALIGN.
Kees Cook6145cfe2013-10-10 17:18:18 -07001889
Kees Cookda2b6fb2013-12-10 12:27:45 -08001890 On 32-bit this is limited to 512MiB by page table layouts. The
1891 default is 512MiB.
Kees Cook6145cfe2013-10-10 17:18:18 -07001892
Kees Cookda2b6fb2013-12-10 12:27:45 -08001893 On 64-bit this is limited by how the kernel fixmap page table is
1894 positioned, so this cannot be larger than 1GiB currently. Without
1895 RANDOMIZE_BASE, there is a 512MiB to 1.5GiB split between kernel
1896 and modules. When RANDOMIZE_BASE_MAX_OFFSET is above 512MiB, the
1897 modules area will shrink to compensate, up to the current maximum
1898 1GiB to 1GiB split. The default is 1GiB.
1899
1900 If unsure, leave at the default value.
Kees Cook8ab38202013-10-10 17:18:14 -07001901
1902# Relocation on x86 needs some additional build support
H. Peter Anvin845adf72009-05-05 21:20:51 -07001903config X86_NEED_RELOCS
1904 def_bool y
Kees Cook8ab38202013-10-10 17:18:14 -07001905 depends on RANDOMIZE_BASE || (X86_32 && RELOCATABLE)
H. Peter Anvin845adf72009-05-05 21:20:51 -07001906
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001907config PHYSICAL_ALIGN
Kees Cooka0215062013-07-08 09:15:17 -07001908 hex "Alignment value to which kernel should be aligned"
Kees Cook8ab38202013-10-10 17:18:14 -07001909 default "0x200000"
Kees Cooka0215062013-07-08 09:15:17 -07001910 range 0x2000 0x1000000 if X86_32
1911 range 0x200000 0x1000000 if X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001912 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001913 This value puts the alignment restrictions on physical address
1914 where kernel is loaded and run from. Kernel is compiled for an
1915 address which meets above alignment restriction.
1916
1917 If bootloader loads the kernel at a non-aligned address and
1918 CONFIG_RELOCATABLE is set, kernel will move itself to nearest
1919 address aligned to above value and run from there.
1920
1921 If bootloader loads the kernel at a non-aligned address and
1922 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
1923 load address and decompress itself to the address it has been
1924 compiled for and run from there. The address for which kernel is
1925 compiled already meets above alignment restrictions. Hence the
1926 end result is that kernel runs from a physical address meeting
1927 above alignment restrictions.
1928
Kees Cooka0215062013-07-08 09:15:17 -07001929 On 32-bit this value must be a multiple of 0x2000. On 64-bit
1930 this value must be a multiple of 0x200000.
1931
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001932 Don't change this unless you know what you are doing.
1933
1934config HOTPLUG_CPU
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001935 bool "Support for hot-pluggable CPUs"
Stephen Rothwell40b31362013-05-21 13:49:35 +10001936 depends on SMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001937 ---help---
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001938 Say Y here to allow turning CPUs off and on. CPUs can be
1939 controlled through /sys/devices/system/cpu.
1940 ( Note: power management support will enable this option
1941 automatically on SMP systems. )
1942 Say N if you want to disable CPU hotplug.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001943
Fenghua Yu80aa1df2012-11-13 11:32:39 -08001944config BOOTPARAM_HOTPLUG_CPU0
1945 bool "Set default setting of cpu0_hotpluggable"
1946 default n
Kees Cook2c922cd2013-01-22 13:01:19 -08001947 depends on HOTPLUG_CPU
Fenghua Yu80aa1df2012-11-13 11:32:39 -08001948 ---help---
1949 Set whether default state of cpu0_hotpluggable is on or off.
1950
1951 Say Y here to enable CPU0 hotplug by default. If this switch
1952 is turned on, there is no need to give cpu0_hotplug kernel
1953 parameter and the CPU0 hotplug feature is enabled by default.
1954
1955 Please note: there are two known CPU0 dependencies if you want
1956 to enable the CPU0 hotplug feature either by this switch or by
1957 cpu0_hotplug kernel parameter.
1958
1959 First, resume from hibernate or suspend always starts from CPU0.
1960 So hibernate and suspend are prevented if CPU0 is offline.
1961
1962 Second dependency is PIC interrupts always go to CPU0. CPU0 can not
1963 offline if any interrupt can not migrate out of CPU0. There may
1964 be other CPU0 dependencies.
1965
1966 Please make sure the dependencies are under your control before
1967 you enable this feature.
1968
1969 Say N if you don't want to enable CPU0 hotplug feature by default.
1970 You still can enable the CPU0 hotplug feature at boot by kernel
1971 parameter cpu0_hotplug.
1972
Fenghua Yua71c8bc2012-11-13 11:32:51 -08001973config DEBUG_HOTPLUG_CPU0
1974 def_bool n
1975 prompt "Debug CPU0 hotplug"
Kees Cook2c922cd2013-01-22 13:01:19 -08001976 depends on HOTPLUG_CPU
Fenghua Yua71c8bc2012-11-13 11:32:51 -08001977 ---help---
1978 Enabling this option offlines CPU0 (if CPU0 can be offlined) as
1979 soon as possible and boots up userspace with CPU0 offlined. User
1980 can online CPU0 back after boot time.
1981
1982 To debug CPU0 hotplug, you need to enable CPU0 offline/online
1983 feature by either turning on CONFIG_BOOTPARAM_HOTPLUG_CPU0 during
1984 compilation or giving cpu0_hotplug kernel parameter at boot.
1985
1986 If unsure, say N.
1987
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001988config COMPAT_VDSO
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07001989 def_bool n
1990 prompt "Disable the 32-bit vDSO (needed for glibc 2.3.3)"
Roland McGrathaf65d642008-01-30 13:30:43 +01001991 depends on X86_32 || IA32_EMULATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001992 ---help---
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07001993 Certain buggy versions of glibc will crash if they are
1994 presented with a 32-bit vDSO that is not mapped at the address
1995 indicated in its segment table.
Randy Dunlape84446d2009-11-10 15:46:52 -08001996
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07001997 The bug was introduced by f866314b89d56845f55e6f365e18b31ec978ec3a
1998 and fixed by 3b3ddb4f7db98ec9e912ccdf54d35df4aa30e04a and
1999 49ad572a70b8aeb91e57483a11dd1b77e31c4468. Glibc 2.3.3 is
2000 the only released version with the bug, but OpenSUSE 9
2001 contains a buggy "glibc 2.3.2".
Sam Ravnborg506f1d02007-11-09 21:56:54 +01002002
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07002003 The symptom of the bug is that everything crashes on startup, saying:
2004 dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed!
2005
2006 Saying Y here changes the default value of the vdso32 boot
2007 option from 1 to 0, which turns off the 32-bit vDSO entirely.
2008 This works around the glibc bug but hurts performance.
2009
2010 If unsure, say N: if you are compiling your own kernel, you
2011 are unlikely to be using a buggy version of glibc.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01002012
Tim Bird516cbf32008-08-12 12:52:36 -07002013config CMDLINE_BOOL
2014 bool "Built-in kernel command line"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002015 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07002016 Allow for specifying boot arguments to the kernel at
2017 build time. On some systems (e.g. embedded ones), it is
2018 necessary or convenient to provide some or all of the
2019 kernel boot arguments with the kernel itself (that is,
2020 to not rely on the boot loader to provide them.)
2021
2022 To compile command line arguments into the kernel,
2023 set this option to 'Y', then fill in the
Sébastien Hinderer69711ca2015-07-08 00:02:01 +02002024 boot arguments in CONFIG_CMDLINE.
Tim Bird516cbf32008-08-12 12:52:36 -07002025
2026 Systems with fully functional boot loaders (i.e. non-embedded)
2027 should leave this option set to 'N'.
2028
2029config CMDLINE
2030 string "Built-in kernel command string"
2031 depends on CMDLINE_BOOL
2032 default ""
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002033 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07002034 Enter arguments here that should be compiled into the kernel
2035 image and used at boot time. If the boot loader provides a
2036 command line at boot time, it is appended to this string to
2037 form the full kernel command line, when the system boots.
2038
2039 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
2040 change this behavior.
2041
2042 In most cases, the command line (whether built-in or provided
2043 by the boot loader) should specify the device for the root
2044 file system.
2045
2046config CMDLINE_OVERRIDE
2047 bool "Built-in command line overrides boot loader arguments"
Tim Bird516cbf32008-08-12 12:52:36 -07002048 depends on CMDLINE_BOOL
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002049 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07002050 Set this option to 'Y' to have the kernel ignore the boot loader
2051 command line, and use ONLY the built-in command line.
2052
2053 This is used to work around broken boot loaders. This should
2054 be set to 'N' under normal conditions.
2055
Seth Jenningsb700e7f2014-12-16 11:58:19 -06002056source "kernel/livepatch/Kconfig"
2057
Sam Ravnborg506f1d02007-11-09 21:56:54 +01002058endmenu
2059
2060config ARCH_ENABLE_MEMORY_HOTPLUG
2061 def_bool y
2062 depends on X86_64 || (X86_32 && HIGHMEM)
2063
Gary Hade35551052008-10-31 10:52:03 -07002064config ARCH_ENABLE_MEMORY_HOTREMOVE
2065 def_bool y
2066 depends on MEMORY_HOTPLUG
2067
Lee Schermerhorne534c7c2010-05-26 14:44:58 -07002068config USE_PERCPU_NUMA_NODE_ID
Tejun Heo645a7912011-01-23 14:37:40 +01002069 def_bool y
Lee Schermerhorne534c7c2010-05-26 14:44:58 -07002070 depends on NUMA
2071
Kirill A. Shutemov94918462013-11-14 14:31:10 -08002072config ARCH_ENABLE_SPLIT_PMD_PTLOCK
2073 def_bool y
2074 depends on X86_64 || X86_PAE
2075
Naoya Horiguchic177c812014-06-04 16:05:35 -07002076config ARCH_ENABLE_HUGEPAGE_MIGRATION
2077 def_bool y
2078 depends on X86_64 && HUGETLB_PAGE && MIGRATION
2079
Bjorn Helgaasda85f862008-11-05 13:37:27 -06002080menu "Power management and ACPI options"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002081
2082config ARCH_HIBERNATION_HEADER
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002083 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002084 depends on X86_64 && HIBERNATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002085
2086source "kernel/power/Kconfig"
2087
2088source "drivers/acpi/Kconfig"
2089
Feng Tangefafc8b2009-08-14 15:23:29 -04002090source "drivers/sfi/Kconfig"
2091
Andi Kleena6b68072008-01-30 13:32:49 +01002092config X86_APM_BOOT
Jan Beulich6fc108a2010-04-21 15:23:44 +01002093 def_bool y
Paul Bolle282e5aa2011-11-17 11:41:31 +01002094 depends on APM
Andi Kleena6b68072008-01-30 13:32:49 +01002095
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002096menuconfig APM
2097 tristate "APM (Advanced Power Management) BIOS support"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02002098 depends on X86_32 && PM_SLEEP
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002099 ---help---
2100 APM is a BIOS specification for saving power using several different
2101 techniques. This is mostly useful for battery powered laptops with
2102 APM compliant BIOSes. If you say Y here, the system time will be
2103 reset after a RESUME operation, the /proc/apm device will provide
2104 battery status information, and user-space programs will receive
2105 notification of APM "events" (e.g. battery status change).
2106
2107 If you select "Y" here, you can disable actual use of the APM
2108 BIOS by passing the "apm=off" option to the kernel at boot time.
2109
2110 Note that the APM support is almost completely disabled for
2111 machines with more than one CPU.
2112
2113 In order to use APM, you will need supporting software. For location
Michael Witten2dc98fd2011-07-08 21:11:16 +00002114 and more information, read <file:Documentation/power/apm-acpi.txt>
2115 and the Battery Powered Linux mini-HOWTO, available from
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002116 <http://www.tldp.org/docs.html#howto>.
2117
2118 This driver does not spin down disk drives (see the hdparm(8)
2119 manpage ("man 8 hdparm") for that), and it doesn't turn off
2120 VESA-compliant "green" monitors.
2121
2122 This driver does not support the TI 4000M TravelMate and the ACER
2123 486/DX4/75 because they don't have compliant BIOSes. Many "green"
2124 desktop machines also don't have compliant BIOSes, and this driver
2125 may cause those machines to panic during the boot phase.
2126
2127 Generally, if you don't have a battery in your machine, there isn't
2128 much point in using this driver and you should say N. If you get
2129 random kernel OOPSes or reboots that don't seem to be related to
2130 anything, try disabling/enabling this option (or disabling/enabling
2131 APM in your BIOS).
2132
2133 Some other things you should try when experiencing seemingly random,
2134 "weird" problems:
2135
2136 1) make sure that you have enough swap space and that it is
2137 enabled.
2138 2) pass the "no-hlt" option to the kernel
2139 3) switch on floating point emulation in the kernel and pass
2140 the "no387" option to the kernel
2141 4) pass the "floppy=nodma" option to the kernel
2142 5) pass the "mem=4M" option to the kernel (thereby disabling
2143 all but the first 4 MB of RAM)
2144 6) make sure that the CPU is not over clocked.
2145 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
2146 8) disable the cache from your BIOS settings
2147 9) install a fan for the video card or exchange video RAM
2148 10) install a better fan for the CPU
2149 11) exchange RAM chips
2150 12) exchange the motherboard.
2151
2152 To compile this driver as a module, choose M here: the
2153 module will be called apm.
2154
2155if APM
2156
2157config APM_IGNORE_USER_SUSPEND
2158 bool "Ignore USER SUSPEND"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002159 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002160 This option will ignore USER SUSPEND requests. On machines with a
2161 compliant APM BIOS, you want to say N. However, on the NEC Versa M
2162 series notebooks, it is necessary to say Y because of a BIOS bug.
2163
2164config APM_DO_ENABLE
2165 bool "Enable PM at boot time"
2166 ---help---
2167 Enable APM features at boot time. From page 36 of the APM BIOS
2168 specification: "When disabled, the APM BIOS does not automatically
2169 power manage devices, enter the Standby State, enter the Suspend
2170 State, or take power saving steps in response to CPU Idle calls."
2171 This driver will make CPU Idle calls when Linux is idle (unless this
2172 feature is turned off -- see "Do CPU IDLE calls", below). This
2173 should always save battery power, but more complicated APM features
2174 will be dependent on your BIOS implementation. You may need to turn
2175 this option off if your computer hangs at boot time when using APM
2176 support, or if it beeps continuously instead of suspending. Turn
2177 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
2178 T400CDT. This is off by default since most machines do fine without
2179 this feature.
2180
2181config APM_CPU_IDLE
Len Browndd8af072013-02-09 21:10:04 -05002182 depends on CPU_IDLE
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002183 bool "Make CPU Idle calls when idle"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002184 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002185 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
2186 On some machines, this can activate improved power savings, such as
2187 a slowed CPU clock rate, when the machine is idle. These idle calls
2188 are made after the idle loop has run for some length of time (e.g.,
2189 333 mS). On some machines, this will cause a hang at boot time or
2190 whenever the CPU becomes idle. (On machines with more than one CPU,
2191 this option does nothing.)
2192
2193config APM_DISPLAY_BLANK
2194 bool "Enable console blanking using APM"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002195 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002196 Enable console blanking using the APM. Some laptops can use this to
2197 turn off the LCD backlight when the screen blanker of the Linux
2198 virtual console blanks the screen. Note that this is only used by
2199 the virtual console screen blanker, and won't turn off the backlight
2200 when using the X Window system. This also doesn't have anything to
2201 do with your VESA-compliant power-saving monitor. Further, this
2202 option doesn't work for all laptops -- it might not turn off your
2203 backlight at all, or it might print a lot of errors to the console,
2204 especially if you are using gpm.
2205
2206config APM_ALLOW_INTS
2207 bool "Allow interrupts during APM BIOS calls"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002208 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002209 Normally we disable external interrupts while we are making calls to
2210 the APM BIOS as a measure to lessen the effects of a badly behaving
2211 BIOS implementation. The BIOS should reenable interrupts if it
2212 needs to. Unfortunately, some BIOSes do not -- especially those in
2213 many of the newer IBM Thinkpads. If you experience hangs when you
2214 suspend, try setting this to Y. Otherwise, say N.
2215
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002216endif # APM
2217
Dave Jonesbb0a56e2011-05-19 18:51:07 -04002218source "drivers/cpufreq/Kconfig"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002219
2220source "drivers/cpuidle/Kconfig"
2221
Andy Henroid27471fd2008-10-09 11:45:22 -07002222source "drivers/idle/Kconfig"
2223
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002224endmenu
2225
2226
2227menu "Bus options (PCI etc.)"
2228
2229config PCI
Ingo Molnar1ac97012008-05-19 14:10:14 +02002230 bool "PCI support"
Adrian Bunk1c858082008-01-30 13:32:32 +01002231 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002232 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002233 Find out whether you have a PCI motherboard. PCI is the name of a
2234 bus system, i.e. the way the CPU talks to the other stuff inside
2235 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
2236 VESA. If you have PCI, say Y, otherwise N.
2237
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002238choice
2239 prompt "PCI access mode"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02002240 depends on X86_32 && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002241 default PCI_GOANY
2242 ---help---
2243 On PCI systems, the BIOS can be used to detect the PCI devices and
2244 determine their configuration. However, some old PCI motherboards
2245 have BIOS bugs and may crash if this is done. Also, some embedded
2246 PCI-based systems don't have any BIOS at all. Linux can also try to
2247 detect the PCI hardware directly without using the BIOS.
2248
2249 With this option, you can specify how Linux should detect the
2250 PCI devices. If you choose "BIOS", the BIOS will be used,
2251 if you choose "Direct", the BIOS won't be used, and if you
2252 choose "MMConfig", then PCI Express MMCONFIG will be used.
2253 If you choose "Any", the kernel will try MMCONFIG, then the
2254 direct access method and falls back to the BIOS if that doesn't
2255 work. If unsure, go with the default, which is "Any".
2256
2257config PCI_GOBIOS
2258 bool "BIOS"
2259
2260config PCI_GOMMCONFIG
2261 bool "MMConfig"
2262
2263config PCI_GODIRECT
2264 bool "Direct"
2265
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002266config PCI_GOOLPC
Daniel Drake76fb6572010-09-23 17:28:04 +01002267 bool "OLPC XO-1"
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002268 depends on OLPC
2269
Andres Salomon2bdd1b02008-06-05 14:14:41 -07002270config PCI_GOANY
2271 bool "Any"
2272
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002273endchoice
2274
2275config PCI_BIOS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002276 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02002277 depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002278
2279# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
2280config PCI_DIRECT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002281 def_bool y
Shaohua Li0aba4962011-05-27 14:59:39 +08002282 depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC || PCI_GOMMCONFIG))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002283
2284config PCI_MMCONFIG
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002285 def_bool y
Feng Tang5f0db7a2009-08-14 15:37:50 -04002286 depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002287
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002288config PCI_OLPC
Andres Salomon2bdd1b02008-06-05 14:14:41 -07002289 def_bool y
2290 depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002291
Alex Nixonb5401a92010-03-18 16:31:34 -04002292config PCI_XEN
2293 def_bool y
2294 depends on PCI && XEN
2295 select SWIOTLB_XEN
2296
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002297config PCI_DOMAINS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002298 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002299 depends on PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002300
2301config PCI_MMCONFIG
2302 bool "Support mmconfig PCI config space access"
2303 depends on X86_64 && PCI && ACPI
2304
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07002305config PCI_CNB20LE_QUIRK
David Rientjes6a108a12011-01-20 14:44:16 -08002306 bool "Read CNB20LE Host Bridge Windows" if EXPERT
Kees Cook6ea30382012-10-02 11:16:47 -07002307 depends on PCI
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07002308 help
2309 Read the PCI windows out of the CNB20LE host bridge. This allows
2310 PCI hotplug to work on systems with the CNB20LE chipset which do
2311 not have ACPI.
2312
Bjorn Helgaas64a5fed2011-01-06 10:12:30 -07002313 There's no public spec for this chipset, and this functionality
2314 is known to be incomplete.
2315
2316 You should say N unless you know you need this.
2317
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002318source "drivers/pci/pcie/Kconfig"
2319
2320source "drivers/pci/Kconfig"
2321
David Rientjes1c00f012011-03-22 16:34:59 -07002322# x86_64 have no ISA slots, but can have ISA-style DMA.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002323config ISA_DMA_API
David Rientjes1c00f012011-03-22 16:34:59 -07002324 bool "ISA-style DMA support" if (X86_64 && EXPERT)
2325 default y
2326 help
2327 Enables ISA-style DMA support for devices requiring such controllers.
2328 If unsure, say Y.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002329
2330if X86_32
2331
2332config ISA
2333 bool "ISA support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002334 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002335 Find out whether you have ISA slots on your motherboard. ISA is the
2336 name of a bus system, i.e. the way the CPU talks to the other stuff
2337 inside your box. Other bus systems are PCI, EISA, MicroChannel
2338 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
2339 newer boards don't support it. If you have ISA, say Y, otherwise N.
2340
2341config EISA
2342 bool "EISA support"
2343 depends on ISA
2344 ---help---
2345 The Extended Industry Standard Architecture (EISA) bus was
2346 developed as an open alternative to the IBM MicroChannel bus.
2347
2348 The EISA bus provided some of the features of the IBM MicroChannel
2349 bus while maintaining backward compatibility with cards made for
2350 the older ISA bus. The EISA bus saw limited use between 1988 and
2351 1995 when it was made obsolete by the PCI bus.
2352
2353 Say Y here if you are building a kernel for an EISA-based machine.
2354
2355 Otherwise, say N.
2356
2357source "drivers/eisa/Kconfig"
2358
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002359config SCx200
2360 tristate "NatSemi SCx200 support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002361 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002362 This provides basic support for National Semiconductor's
2363 (now AMD's) Geode processors. The driver probes for the
2364 PCI-IDs of several on-chip devices, so its a good dependency
2365 for other scx200_* drivers.
2366
2367 If compiled as a module, the driver is named scx200.
2368
2369config SCx200HR_TIMER
2370 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
John Stultz592913e2010-07-13 17:56:20 -07002371 depends on SCx200
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002372 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002373 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002374 This driver provides a clocksource built upon the on-chip
2375 27MHz high-resolution timer. Its also a workaround for
2376 NSC Geode SC-1100's buggy TSC, which loses time when the
2377 processor goes idle (as is done by the scheduler). The
2378 other workaround is idle=poll boot option.
2379
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002380config OLPC
2381 bool "One Laptop Per Child support"
Thomas Gleixner54008972011-02-23 09:50:15 +01002382 depends on !X86_PAE
Andres Salomon3c554942009-12-14 18:00:36 -08002383 select GPIOLIB
Thomas Gleixnerdc3119e72011-02-23 10:08:31 +01002384 select OF
Daniel Drake45bb1672011-03-13 15:10:17 +00002385 select OF_PROMTREE
Grant Likelyb4e51852011-12-16 15:50:17 -07002386 select IRQ_DOMAIN
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002387 ---help---
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002388 Add support for detecting the unique features of the OLPC
2389 XO hardware.
2390
Daniel Drakea3128582011-06-25 17:34:10 +01002391config OLPC_XO1_PM
2392 bool "OLPC XO-1 Power Management"
Daniel Drake97c4cb72011-06-25 17:34:11 +01002393 depends on OLPC && MFD_CS5535 && PM_SLEEP
Daniel Drakea3128582011-06-25 17:34:10 +01002394 select MFD_CORE
Daniel Drakebf1ebf02010-10-10 10:40:32 +01002395 ---help---
Daniel Drake97c4cb72011-06-25 17:34:11 +01002396 Add support for poweroff and suspend of the OLPC XO-1 laptop.
Daniel Drakebf1ebf02010-10-10 10:40:32 +01002397
Daniel Drakecfee9592011-06-25 17:34:17 +01002398config OLPC_XO1_RTC
2399 bool "OLPC XO-1 Real Time Clock"
2400 depends on OLPC_XO1_PM && RTC_DRV_CMOS
2401 ---help---
2402 Add support for the XO-1 real time clock, which can be used as a
2403 programmable wakeup source.
2404
Daniel Drake7feda8e2011-06-25 17:34:12 +01002405config OLPC_XO1_SCI
2406 bool "OLPC XO-1 SCI extras"
Daniel Draked8d01a62011-07-24 18:33:21 +01002407 depends on OLPC && OLPC_XO1_PM
Randy Dunlaped8e47f2012-12-18 12:22:17 -08002408 depends on INPUT=y
Daniel Draked8d01a62011-07-24 18:33:21 +01002409 select POWER_SUPPLY
Daniel Drake7feda8e2011-06-25 17:34:12 +01002410 select GPIO_CS5535
2411 select MFD_CORE
2412 ---help---
2413 Add support for SCI-based features of the OLPC XO-1 laptop:
Daniel Drake7bc74b32011-06-25 17:34:14 +01002414 - EC-driven system wakeups
Daniel Drake7feda8e2011-06-25 17:34:12 +01002415 - Power button
Daniel Drake7bc74b32011-06-25 17:34:14 +01002416 - Ebook switch
Daniel Drake2cf2bae2011-06-25 17:34:15 +01002417 - Lid switch
Daniel Drakee1040ac2011-06-25 17:34:16 +01002418 - AC adapter status updates
2419 - Battery status updates
Daniel Drake7feda8e2011-06-25 17:34:12 +01002420
Daniel Drakea0f30f52011-06-25 17:34:18 +01002421config OLPC_XO15_SCI
2422 bool "OLPC XO-1.5 SCI extras"
Daniel Draked8d01a62011-07-24 18:33:21 +01002423 depends on OLPC && ACPI
2424 select POWER_SUPPLY
Daniel Drakea0f30f52011-06-25 17:34:18 +01002425 ---help---
2426 Add support for SCI-based features of the OLPC XO-1.5 laptop:
2427 - EC-driven system wakeups
2428 - AC adapter status updates
2429 - Battery status updates
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002430
Ed Wildgoosed4f3e352011-09-20 14:00:12 -07002431config ALIX
2432 bool "PCEngines ALIX System Support (LED setup)"
2433 select GPIOLIB
2434 ---help---
2435 This option enables system support for the PCEngines ALIX.
2436 At present this just sets up LEDs for GPIO control on
2437 ALIX2/3/6 boards. However, other system specific setup should
2438 get added here.
2439
2440 Note: You must still enable the drivers for GPIO and LED support
2441 (GPIO_CS5535 & LEDS_GPIO) to actually use the LEDs
2442
2443 Note: You have to set alix.force=1 for boards with Award BIOS.
2444
Philip Prindevilleda4e3302012-03-05 15:05:15 -08002445config NET5501
2446 bool "Soekris Engineering net5501 System Support (LEDS, GPIO, etc)"
2447 select GPIOLIB
2448 ---help---
2449 This option enables system support for the Soekris Engineering net5501.
2450
Philip A. Prindeville31970592012-01-14 01:45:39 -07002451config GEOS
2452 bool "Traverse Technologies GEOS System Support (LEDS, GPIO, etc)"
2453 select GPIOLIB
2454 depends on DMI
2455 ---help---
2456 This option enables system support for the Traverse Technologies GEOS.
2457
Vivien Didelot7d029122013-01-04 16:18:14 -05002458config TS5500
2459 bool "Technologic Systems TS-5500 platform support"
2460 depends on MELAN
2461 select CHECK_SIGNATURE
2462 select NEW_LEDS
2463 select LEDS_CLASS
2464 ---help---
2465 This option enables system support for the Technologic Systems TS-5500.
2466
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002467endif # X86_32
2468
Andreas Herrmann23ac4ae2010-09-17 18:03:43 +02002469config AMD_NB
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002470 def_bool y
Borislav Petkov0e152cd2010-03-12 15:43:03 +01002471 depends on CPU_SUP_AMD && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002472
2473source "drivers/pcmcia/Kconfig"
2474
2475source "drivers/pci/hotplug/Kconfig"
2476
Alexandre Bounine388b78a2011-03-23 16:43:03 -07002477config RAPIDIO
Alexandre Bouninefdf90ab2013-07-03 15:08:56 -07002478 tristate "RapidIO support"
Alexandre Bounine388b78a2011-03-23 16:43:03 -07002479 depends on PCI
2480 default n
2481 help
Alexandre Bouninefdf90ab2013-07-03 15:08:56 -07002482 If enabled this option will include drivers and the core
Alexandre Bounine388b78a2011-03-23 16:43:03 -07002483 infrastructure code to support RapidIO interconnect devices.
2484
2485source "drivers/rapidio/Kconfig"
2486
David Herrmanne3263ab2013-08-02 14:05:22 +02002487config X86_SYSFB
2488 bool "Mark VGA/VBE/EFI FB as generic system framebuffer"
2489 help
2490 Firmwares often provide initial graphics framebuffers so the BIOS,
2491 bootloader or kernel can show basic video-output during boot for
2492 user-guidance and debugging. Historically, x86 used the VESA BIOS
2493 Extensions and EFI-framebuffers for this, which are mostly limited
2494 to x86.
2495 This option, if enabled, marks VGA/VBE/EFI framebuffers as generic
2496 framebuffers so the new generic system-framebuffer drivers can be
2497 used on x86. If the framebuffer is not compatible with the generic
2498 modes, it is adverticed as fallback platform framebuffer so legacy
2499 drivers like efifb, vesafb and uvesafb can pick it up.
2500 If this option is not selected, all system framebuffers are always
2501 marked as fallback platform framebuffers as usual.
2502
2503 Note: Legacy fbdev drivers, including vesafb, efifb, uvesafb, will
2504 not be able to pick up generic system framebuffers if this option
2505 is selected. You are highly encouraged to enable simplefb as
2506 replacement if you select this option. simplefb can correctly deal
2507 with generic system framebuffers. But you should still keep vesafb
2508 and others enabled as fallback if a system framebuffer is
2509 incompatible with simplefb.
2510
2511 If unsure, say Y.
2512
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002513endmenu
2514
2515
2516menu "Executable file formats / Emulations"
2517
2518source "fs/Kconfig.binfmt"
2519
2520config IA32_EMULATION
2521 bool "IA32 Emulation"
2522 depends on X86_64
Randy Dunlapd1603992013-06-18 12:33:40 -07002523 select BINFMT_ELF
Roland McGratha97f52e2008-01-30 13:31:55 +01002524 select COMPAT_BINFMT_ELF
Catalin Marinasaf1839e2012-10-08 16:28:08 -07002525 select HAVE_UID16
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002526 ---help---
H. J. Lu5fd92e62012-02-19 10:40:03 -08002527 Include code to run legacy 32-bit programs under a
2528 64-bit kernel. You should likely turn this on, unless you're
2529 100% sure that you don't have any 32-bit programs left.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002530
2531config IA32_AOUT
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002532 tristate "IA32 a.out support"
2533 depends on IA32_EMULATION
2534 ---help---
2535 Support old a.out binaries in the 32bit emulation.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002536
H. Peter Anvin0bf62762012-02-27 14:09:10 -08002537config X86_X32
Kees Cook6ea30382012-10-02 11:16:47 -07002538 bool "x32 ABI for 64-bit mode"
2539 depends on X86_64 && IA32_EMULATION
H. J. Lu5fd92e62012-02-19 10:40:03 -08002540 ---help---
2541 Include code to run binaries for the x32 native 32-bit ABI
2542 for 64-bit processors. An x32 process gets access to the
2543 full 64-bit register file and wide data path while leaving
2544 pointers at 32 bits for smaller memory footprint.
2545
2546 You will need a recent binutils (2.22 or later) with
2547 elf32_x86_64 support enabled to compile a kernel with this
2548 option set.
2549
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002550config COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002551 def_bool y
H. Peter Anvin0bf62762012-02-27 14:09:10 -08002552 depends on IA32_EMULATION || X86_X32
Chris Metcalf48b25c42012-03-15 13:13:38 -04002553 select ARCH_WANT_OLD_COMPAT_IPC
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002554
Jan Beulich3120e252012-09-10 12:41:45 +01002555if COMPAT
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002556config COMPAT_FOR_U64_ALIGNMENT
Jan Beulich3120e252012-09-10 12:41:45 +01002557 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002558
2559config SYSVIPC_COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002560 def_bool y
Jan Beulich3120e252012-09-10 12:41:45 +01002561 depends on SYSVIPC
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002562
David Howellsee009e4a02011-03-07 15:06:20 +00002563config KEYS_COMPAT
Jan Beulich3120e252012-09-10 12:41:45 +01002564 def_bool y
2565 depends on KEYS
2566endif
David Howellsee009e4a02011-03-07 15:06:20 +00002567
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002568endmenu
2569
2570
Keith Packarde5beae12008-11-03 18:21:45 +01002571config HAVE_ATOMIC_IOMAP
2572 def_bool y
2573 depends on X86_32
2574
Alessandro Rubini4692d772012-04-04 19:39:58 +02002575config X86_DEV_DMA_OPS
2576 bool
Alessandro Rubini83125a32012-04-04 19:40:21 +02002577 depends on X86_64 || STA2X11
Alessandro Rubini4692d772012-04-04 19:39:58 +02002578
Alessandro Rubinif7219a52012-04-04 19:40:10 +02002579config X86_DMA_REMAP
2580 bool
Alessandro Rubini83125a32012-04-04 19:40:21 +02002581 depends on STA2X11
Alessandro Rubinif7219a52012-04-04 19:40:10 +02002582
Li, Aubrey93e5ead2014-06-30 14:08:42 +08002583config PMC_ATOM
2584 def_bool y
2585 depends on PCI
2586
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002587source "net/Kconfig"
2588
2589source "drivers/Kconfig"
2590
2591source "drivers/firmware/Kconfig"
2592
2593source "fs/Kconfig"
2594
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002595source "arch/x86/Kconfig.debug"
2596
2597source "security/Kconfig"
2598
2599source "crypto/Kconfig"
2600
Avi Kivityedf88412007-12-16 11:02:48 +02002601source "arch/x86/kvm/Kconfig"
2602
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002603source "lib/Kconfig"