blob: 3dbb7e7909ca50bc45d44e7a0fbc18d79e3cdb70 [file] [log] [blame]
Sam Ravnborgdaa93fa2007-11-12 20:54:30 +01001# Select 32 or 64 bit
2config 64BIT
Sam Ravnborg68409992007-11-17 15:37:31 +01003 bool "64-bit kernel" if ARCH = "x86"
David Woodhouseffee0de2012-12-20 21:51:55 +00004 default ARCH != "i386"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01005 ---help---
Sam Ravnborgdaa93fa2007-11-12 20:54:30 +01006 Say yes to build a 64-bit kernel - formerly known as x86_64
7 Say no to build a 32-bit kernel - formerly known as i386
8
9config X86_32
Jan Beulich3120e252012-09-10 12:41:45 +010010 def_bool y
11 depends on !64BIT
Sam Ravnborgdaa93fa2007-11-12 20:54:30 +010012
13config X86_64
Jan Beulich3120e252012-09-10 12:41:45 +010014 def_bool y
15 depends on 64BIT
Sam Ravnborg1032c0b2007-11-06 21:35:08 +010016
17### Arch settings
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010018config X86
Harvey Harrison3c2362e2008-01-30 13:31:03 +010019 def_bool y
Ingo Molnar6471b822015-06-03 10:00:13 +020020 select ACPI_LEGACY_TABLES_LOOKUP if ACPI
21 select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI
22 select ANON_INODES
23 select ARCH_CLOCKSOURCE_DATA
24 select ARCH_DISCARD_MEMBLOCK
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 Molnarda4276b2009-01-07 11:05:10 +010044 select ARCH_WANT_FRAME_POINTERS
Ingo Molnar6471b822015-06-03 10:00:13 +020045 select ARCH_WANT_IPC_PARSE_VERSION if X86_32
46 select ARCH_WANT_OPTIONAL_GPIOLIB
47 select BUILDTIME_EXTABLE_SORT
48 select CLKEVT_I8253
49 select CLKSRC_I8253 if X86_32
50 select CLOCKSOURCE_VALIDATE_LAST_CYCLE
51 select CLOCKSOURCE_WATCHDOG
52 select CLONE_BACKWARDS if X86_32
53 select COMPAT_OLD_SIGACTION if IA32_EMULATION
54 select DCACHE_WORD_ACCESS
Linus Torvalds45471cd2015-06-24 19:52:06 -070055 select EDAC_ATOMIC_SCRUB
56 select EDAC_SUPPORT
Ingo Molnar6471b822015-06-03 10:00:13 +020057 select GENERIC_CLOCKEVENTS
58 select GENERIC_CLOCKEVENTS_BROADCAST if X86_64 || (X86_32 && X86_LOCAL_APIC)
59 select GENERIC_CLOCKEVENTS_MIN_ADJUST
60 select GENERIC_CMOS_UPDATE
61 select GENERIC_CPU_AUTOPROBE
62 select GENERIC_EARLY_IOREMAP
63 select GENERIC_FIND_FIRST_BIT
64 select GENERIC_IOMAP
65 select GENERIC_IRQ_PROBE
66 select GENERIC_IRQ_SHOW
67 select GENERIC_PENDING_IRQ if SMP
68 select GENERIC_SMP_IDLE_THREAD
69 select GENERIC_STRNCPY_FROM_USER
70 select GENERIC_STRNLEN_USER
71 select GENERIC_TIME_VSYSCALL
72 select HAVE_ACPI_APEI if ACPI
73 select HAVE_ACPI_APEI_NMI if ACPI
74 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
75 select HAVE_AOUT if X86_32
76 select HAVE_ARCH_AUDITSYSCALL
77 select HAVE_ARCH_HUGE_VMAP if X86_64 || X86_PAE
78 select HAVE_ARCH_JUMP_LABEL
79 select HAVE_ARCH_KASAN if X86_64 && SPARSEMEM_VMEMMAP
80 select HAVE_ARCH_KGDB
81 select HAVE_ARCH_KMEMCHECK
82 select HAVE_ARCH_SECCOMP_FILTER
83 select HAVE_ARCH_SOFT_DIRTY if X86_64
84 select HAVE_ARCH_TRACEHOOK
85 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
86 select HAVE_BPF_JIT if X86_64
87 select HAVE_CC_STACKPROTECTOR
88 select HAVE_CMPXCHG_DOUBLE
89 select HAVE_CMPXCHG_LOCAL
90 select HAVE_CONTEXT_TRACKING if X86_64
Josh Triplettc1bd55f2015-06-30 15:00:00 -070091 select HAVE_COPY_THREAD_TLS
Ingo Molnar6471b822015-06-03 10:00:13 +020092 select HAVE_C_RECORDMCOUNT
93 select HAVE_DEBUG_KMEMLEAK
94 select HAVE_DEBUG_STACKOVERFLOW
95 select HAVE_DMA_API_DEBUG
FUJITA Tomonori7c095e42009-06-17 16:28:12 -070096 select HAVE_DMA_ATTRS
Akinobu Mita9c5a3622014-06-04 16:06:50 -070097 select HAVE_DMA_CONTIGUOUS
Steven Rostedt677aa9f2008-05-17 00:01:36 -040098 select HAVE_DYNAMIC_FTRACE
Masami Hiramatsu06aeaae2012-09-28 17:15:17 +090099 select HAVE_DYNAMIC_FTRACE_WITH_REGS
Johannes Berg58340a02008-07-25 01:45:33 -0700100 select HAVE_EFFICIENT_UNALIGNED_ACCESS
Ingo Molnar6471b822015-06-03 10:00:13 +0200101 select HAVE_FENTRY if X86_64
102 select HAVE_FTRACE_MCOUNT_RECORD
103 select HAVE_FUNCTION_GRAPH_FP_TEST
104 select HAVE_FUNCTION_GRAPH_TRACER
105 select HAVE_FUNCTION_TRACER
106 select HAVE_GENERIC_DMA_COHERENT if X86_32
K.Prasad0067f122009-06-01 23:43:57 +0530107 select HAVE_HW_BREAKPOINT
Ingo Molnar6471b822015-06-03 10:00:13 +0200108 select HAVE_IDE
109 select HAVE_IOREMAP_PROT
110 select HAVE_IRQ_EXIT_ON_IRQ_STACK if X86_64
111 select HAVE_IRQ_TIME_ACCOUNTING
112 select HAVE_KERNEL_BZIP2
113 select HAVE_KERNEL_GZIP
114 select HAVE_KERNEL_LZ4
115 select HAVE_KERNEL_LZMA
116 select HAVE_KERNEL_LZO
117 select HAVE_KERNEL_XZ
118 select HAVE_KPROBES
119 select HAVE_KPROBES_ON_FTRACE
120 select HAVE_KRETPROBES
121 select HAVE_KVM
122 select HAVE_LIVEPATCH if X86_64
123 select HAVE_MEMBLOCK
124 select HAVE_MEMBLOCK_NODE_MAP
Frederic Weisbecker01027522010-04-11 18:55:56 +0200125 select HAVE_MIXED_BREAKPOINTS_REGS
Ingo Molnar6471b822015-06-03 10:00:13 +0200126 select HAVE_OPROFILE
127 select HAVE_OPTPROBES
128 select HAVE_PCSPKR_PLATFORM
129 select HAVE_PERF_EVENTS
Frederic Weisbeckerc01d4322010-05-15 22:57:48 +0200130 select HAVE_PERF_EVENTS_NMI
Jiri Olsac5e63192012-08-07 15:20:36 +0200131 select HAVE_PERF_REGS
Jiri Olsac5ebced2012-08-07 15:20:40 +0200132 select HAVE_PERF_USER_STACK_DUMP
Ingo Molnar6471b822015-06-03 10:00:13 +0200133 select HAVE_REGS_AND_STACK_ACCESS_API
134 select HAVE_SYSCALL_TRACEPOINTS
135 select HAVE_UID16 if X86_32
136 select HAVE_UNSTABLE_SCHED_CLOCK
Avi Kivity7c68af62009-09-19 09:40:22 +0300137 select HAVE_USER_RETURN_NOTIFIER
Thomas Gleixnerc01858082011-02-07 02:24:08 +0100138 select IRQ_FORCED_THREADING
Ingo Molnar6471b822015-06-03 10:00:13 +0200139 select MODULES_USE_ELF_RELA if X86_64
140 select MODULES_USE_ELF_REL if X86_32
141 select OLD_SIGACTION if X86_32
142 select OLD_SIGSUSPEND3 if X86_32 || IA32_EMULATION
143 select PERF_EVENTS
Prarit Bhargava3195ef52013-02-14 12:02:54 -0500144 select RTC_LIB
Ingo Molnar6471b822015-06-03 10:00:13 +0200145 select SPARSE_IRQ
Pranith Kumar83fe27e2014-12-05 11:24:45 -0500146 select SRCU
Ingo Molnar6471b822015-06-03 10:00:13 +0200147 select SYSCTL_EXCEPTION_TRACE
148 select USER_STACKTRACE_SUPPORT
149 select VIRT_TO_BUS
150 select X86_DEV_DMA_OPS if X86_64
151 select X86_FEATURE_NAMES if PROC_FS
Balbir Singh7d8330a2008-02-10 12:46:28 +0530152
Ingo Molnarba7e4d12009-06-06 13:58:12 +0200153config INSTRUCTION_DECODER
Jan Beulich3120e252012-09-10 12:41:45 +0100154 def_bool y
155 depends on KPROBES || PERF_EVENTS || UPROBES
Ingo Molnarba7e4d12009-06-06 13:58:12 +0200156
Peter Zijlstra7fb0f1d2014-10-24 09:12:35 +0200157config PERF_EVENTS_INTEL_UNCORE
158 def_bool y
Peter Zijlstra (Intel)ce5686d2014-10-29 11:17:04 +0100159 depends on PERF_EVENTS && CPU_SUP_INTEL && PCI
Peter Zijlstra7fb0f1d2014-10-24 09:12:35 +0200160
Linus Torvalds51b26ad2009-04-26 10:12:47 -0700161config OUTPUT_FORMAT
162 string
163 default "elf32-i386" if X86_32
164 default "elf64-x86-64" if X86_64
165
Sam Ravnborg73531902008-05-25 23:03:18 +0200166config ARCH_DEFCONFIG
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +0200167 string
Sam Ravnborg73531902008-05-25 23:03:18 +0200168 default "arch/x86/configs/i386_defconfig" if X86_32
169 default "arch/x86/configs/x86_64_defconfig" if X86_64
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +0200170
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100171config LOCKDEP_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100172 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100173
174config STACKTRACE_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100175 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100176
Heiko Carstensaa7d9352008-02-01 17:45:14 +0100177config HAVE_LATENCYTOP_SUPPORT
178 def_bool y
179
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100180config MMU
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100181 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100182
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100183config SBUS
184 bool
185
FUJITA Tomonori3bc4e452010-03-10 15:23:22 -0800186config NEED_DMA_MAP_STATE
Jan Beulich3120e252012-09-10 12:41:45 +0100187 def_bool y
Konrad Rzeszutek Wilka6dfa122015-04-17 15:04:48 -0400188 depends on X86_64 || INTEL_IOMMU || DMA_API_DEBUG || SWIOTLB
FUJITA Tomonori3bc4e452010-03-10 15:23:22 -0800189
FUJITA Tomonori18e98302010-05-26 14:44:32 -0700190config NEED_SG_DMA_LENGTH
Andrew Morton4a14d842010-05-26 14:44:33 -0700191 def_bool y
FUJITA Tomonori18e98302010-05-26 14:44:32 -0700192
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100193config GENERIC_ISA_DMA
Jan Beulich3120e252012-09-10 12:41:45 +0100194 def_bool y
195 depends on ISA_DMA_API
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100196
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100197config GENERIC_BUG
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100198 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100199 depends on BUG
Jan Beulichb93a5312008-12-16 11:40:27 +0000200 select GENERIC_BUG_RELATIVE_POINTERS if X86_64
201
202config GENERIC_BUG_RELATIVE_POINTERS
203 bool
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100204
205config GENERIC_HWEIGHT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100206 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100207
208config ARCH_MAY_HAVE_PC_FDC
Jan Beulich3120e252012-09-10 12:41:45 +0100209 def_bool y
210 depends on ISA_DMA_API
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100211
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100212config RWSEM_XCHGADD_ALGORITHM
Jan Beulich3120e252012-09-10 12:41:45 +0100213 def_bool y
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100214
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100215config GENERIC_CALIBRATE_DELAY
216 def_bool y
217
venkatesh.pallipadi@intel.com9a0b8412008-01-31 17:35:06 -0800218config ARCH_HAS_CPU_RELAX
219 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100220
Pekka Enberg1b27d052008-04-28 02:12:22 -0700221config ARCH_HAS_CACHE_LINE_SIZE
222 def_bool y
223
Mike Travisdd5af902008-01-30 13:33:32 +0100224config HAVE_SETUP_PER_CPU_AREA
Brian Gerst89c9c4c2009-01-27 12:56:48 +0900225 def_bool y
travis@sgi.comb32ef632008-01-30 13:32:51 +0100226
Tejun Heo08fc4582009-08-14 15:00:49 +0900227config NEED_PER_CPU_EMBED_FIRST_CHUNK
228 def_bool y
229
230config NEED_PER_CPU_PAGE_FIRST_CHUNK
Tejun Heo11124412009-02-20 16:29:09 +0900231 def_bool y
232
Johannes Berg801e4062007-12-08 02:12:39 +0100233config ARCH_HIBERNATION_POSSIBLE
234 def_bool y
Johannes Berg801e4062007-12-08 02:12:39 +0100235
Johannes Bergf4cb5702007-12-08 02:14:00 +0100236config ARCH_SUSPEND_POSSIBLE
237 def_bool y
Johannes Bergf4cb5702007-12-08 02:14:00 +0100238
Steve Cappercfe28c52013-04-29 14:29:48 +0100239config ARCH_WANT_HUGE_PMD_SHARE
240 def_bool y
241
Steve Capper53313b22013-04-30 08:03:42 +0100242config ARCH_WANT_GENERAL_HUGETLB
243 def_bool y
244
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100245config ZONE_DMA32
Jan Beuliche0fd24a2015-02-05 15:39:34 +0000246 def_bool y if X86_64
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100247
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100248config AUDIT_ARCH
Jan Beuliche0fd24a2015-02-05 15:39:34 +0000249 def_bool y if X86_64
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100250
Ingo Molnar765c68b2008-04-09 11:03:37 +0200251config ARCH_SUPPORTS_OPTIMIZED_INLINING
252 def_bool y
253
Akinobu Mita6a11f752009-03-31 15:23:17 -0700254config ARCH_SUPPORTS_DEBUG_PAGEALLOC
255 def_bool y
256
Andrey Ryabinind6f2d752015-07-02 12:09:38 +0300257config KASAN_SHADOW_OFFSET
258 hex
259 depends on KASAN
260 default 0xdffffc0000000000
261
Shane Wang69575d32009-09-01 18:25:07 -0700262config HAVE_INTEL_TXT
263 def_bool y
Kees Cook6ea30382012-10-02 11:16:47 -0700264 depends on INTEL_IOMMU && ACPI
Shane Wang69575d32009-09-01 18:25:07 -0700265
Sam Ravnborg6b0c3d42008-01-30 13:32:27 +0100266config X86_32_SMP
267 def_bool y
268 depends on X86_32 && SMP
269
270config X86_64_SMP
271 def_bool y
272 depends on X86_64 && SMP
273
Tejun Heoccbeed32009-02-09 22:17:40 +0900274config X86_32_LAZY_GS
275 def_bool y
Tejun Heo60a53172009-02-09 22:17:40 +0900276 depends on X86_32 && !CC_STACKPROTECTOR
Tejun Heoccbeed32009-02-09 22:17:40 +0900277
Borislav Petkovd61931d2010-03-05 17:34:46 +0100278config ARCH_HWEIGHT_CFLAGS
279 string
280 default "-fcall-saved-ecx -fcall-saved-edx" if X86_32
281 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
282
Srikar Dronamraju2b144492012-02-09 14:56:42 +0530283config ARCH_SUPPORTS_UPROBES
284 def_bool y
285
Rob Herringd20642f2014-04-18 17:19:54 -0500286config FIX_EARLYCON_MEM
287 def_bool y
288
Kirill A. Shutemov98233362015-04-14 15:46:14 -0700289config PGTABLE_LEVELS
290 int
291 default 4 if X86_64
292 default 3 if X86_PAE
293 default 2
294
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100295source "init/Kconfig"
Matt Helsleydc52ddc2008-10-18 20:27:21 -0700296source "kernel/Kconfig.freezer"
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100297
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100298menu "Processor type and features"
299
Randy Dunlap5ee71532012-01-16 11:57:18 -0800300config ZONE_DMA
301 bool "DMA memory allocation support" if EXPERT
302 default y
303 help
304 DMA memory allocation support allows devices with less than 32-bit
305 addressing to allocate within the first 16MB of address space.
306 Disable if no such devices will be used.
307
308 If unsure, say Y.
309
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100310config SMP
311 bool "Symmetric multi-processing support"
312 ---help---
313 This enables support for systems with more than one CPU. If you have
Robert Graffham4a474152014-01-23 15:55:29 -0800314 a system with only one CPU, say N. If you have a system with more
315 than one CPU, say Y.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100316
Robert Graffham4a474152014-01-23 15:55:29 -0800317 If you say N here, the kernel will run on uni- and multiprocessor
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100318 machines, but will use only one CPU of a multiprocessor machine. If
319 you say Y here, the kernel will run on many, but not all,
Robert Graffham4a474152014-01-23 15:55:29 -0800320 uniprocessor machines. On a uniprocessor machine, the kernel
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100321 will run faster if you say N here.
322
323 Note that if you say Y here and choose architecture "586" or
324 "Pentium" under "Processor family", the kernel will not work on 486
325 architectures. Similarly, multiprocessor kernels for the "PPro"
326 architecture may not work on all Pentium based boards.
327
328 People using multiprocessor machines who say Y here should also say
329 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
330 Management" code will be disabled if you say Y here.
331
Paul Bolle395cf962011-08-15 02:02:26 +0200332 See also <file:Documentation/x86/i386/IO-APIC.txt>,
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100333 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
334 <http://www.tldp.org/docs.html#howto>.
335
336 If you don't know what to do here, say N.
337
Josh Triplett9def39be2013-10-30 08:09:45 -0700338config X86_FEATURE_NAMES
339 bool "Processor feature human-readable names" if EMBEDDED
340 default y
341 ---help---
342 This option compiles in a table of x86 feature bits and corresponding
343 names. This is required to support /proc/cpuinfo and a few kernel
344 messages. You can disable this to save space, at the expense of
345 making those few kernel messages show numeric feature bits instead.
346
347 If in doubt, say Y.
348
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800349config X86_X2APIC
350 bool "Support x2apic"
Jan Kiszka19e3d602015-05-04 17:58:01 +0200351 depends on X86_LOCAL_APIC && X86_64 && (IRQ_REMAP || HYPERVISOR_GUEST)
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800352 ---help---
353 This enables x2apic support on CPUs that have this feature.
354
355 This allows 32-bit apic IDs (so it can support very large systems),
356 and accesses the local apic via MSRs not via mmio.
357
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800358 If you don't know what to do here, say N.
359
Yinghai Lu6695c852008-06-19 12:13:09 -0700360config X86_MPPARSE
Bin Gao6e87f9b72012-10-25 09:35:44 -0700361 bool "Enable MPS table" if ACPI || SFI
Jan Beulich7a527682008-10-30 10:38:24 +0000362 default y
Ingo Molnar5ab74722008-07-10 14:42:03 +0200363 depends on X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100364 ---help---
Yinghai Lu6695c852008-06-19 12:13:09 -0700365 For old smp systems that do not have proper acpi support. Newer systems
366 (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
Yinghai Lu6695c852008-06-19 12:13:09 -0700367
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800368config X86_BIGSMP
369 bool "Support for big SMP systems with more than 8 CPUs"
370 depends on X86_32 && SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100371 ---help---
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800372 This option is needed for the systems that have more than 8 CPUs
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100373
Jun Nakajimaddd70cf2013-01-21 17:23:09 +0000374config GOLDFISH
375 def_bool y
376 depends on X86_GOLDFISH
377
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800378if X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800379config X86_EXTENDED_PLATFORM
380 bool "Support for extended (non-PC) x86 platforms"
381 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100382 ---help---
Ingo Molnar06ac8342009-01-27 18:11:43 +0100383 If you disable this option then the kernel will only support
384 standard PC platforms. (which covers the vast majority of
385 systems out there.)
386
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800387 If you enable this option then you'll be able to select support
388 for the following (non-PC) 32 bit x86 platforms:
Ben Hutchingscb7b8022013-06-24 01:05:25 +0100389 Goldfish (Android emulator)
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800390 AMD Elan
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800391 RDC R-321x SoC
392 SGI 320/540 (Visual Workstation)
Alessandro Rubini83125a32012-04-04 19:40:21 +0200393 STA2X11-based (e.g. Northville)
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200394 Moorestown MID devices
Ingo Molnar06ac8342009-01-27 18:11:43 +0100395
396 If you have one of these systems, or if you want to build a
397 generic distribution kernel, say Y here - otherwise say N.
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800398endif
Ingo Molnar06ac8342009-01-27 18:11:43 +0100399
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800400if X86_64
401config X86_EXTENDED_PLATFORM
402 bool "Support for extended (non-PC) x86 platforms"
403 default y
404 ---help---
405 If you disable this option then the kernel will only support
406 standard PC platforms. (which covers the vast majority of
407 systems out there.)
408
409 If you enable this option then you'll be able to select support
410 for the following (non-PC) 64 bit x86 platforms:
Steffen Persvold44b111b52011-12-06 00:07:26 +0800411 Numascale NumaChip
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800412 ScaleMP vSMP
413 SGI Ultraviolet
414
415 If you have one of these systems, or if you want to build a
416 generic distribution kernel, say Y here - otherwise say N.
417endif
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800418# This is an alphabetically sorted list of 64 bit extended platforms
419# Please maintain the alphabetic order if and when there are additions
Steffen Persvold44b111b52011-12-06 00:07:26 +0800420config X86_NUMACHIP
421 bool "Numascale NumaChip"
422 depends on X86_64
423 depends on X86_EXTENDED_PLATFORM
424 depends on NUMA
425 depends on SMP
426 depends on X86_X2APIC
Daniel J Bluemanf9726bf2012-12-07 14:24:32 -0700427 depends on PCI_MMCONFIG
Steffen Persvold44b111b52011-12-06 00:07:26 +0800428 ---help---
429 Adds support for Numascale NumaChip large-SMP systems. Needed to
430 enable more than ~168 cores.
431 If you don't have one of these, you should say N here.
Nick Piggin03b48632009-01-20 04:36:04 +0100432
Ingo Molnar6a485652009-01-27 18:29:13 +0100433config X86_VSMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800434 bool "ScaleMP vSMP"
Borislav Petkov6276a072013-03-04 21:20:21 +0100435 select HYPERVISOR_GUEST
Ingo Molnar6a485652009-01-27 18:29:13 +0100436 select PARAVIRT
437 depends on X86_64 && PCI
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800438 depends on X86_EXTENDED_PLATFORM
Shai Fultheimead91d42012-04-16 10:39:35 +0300439 depends on SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100440 ---help---
Ingo Molnar6a485652009-01-27 18:29:13 +0100441 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
442 supposed to run on these EM64T-based machines. Only choose this option
443 if you have one of these machines.
444
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800445config X86_UV
446 bool "SGI Ultraviolet"
447 depends on X86_64
448 depends on X86_EXTENDED_PLATFORM
Jack Steiner54c28d22009-04-03 15:39:42 -0500449 depends on NUMA
Suresh Siddha9d6c26e2009-04-20 13:02:31 -0700450 depends on X86_X2APIC
Ingo Molnar1222e562015-05-06 06:23:59 +0200451 depends on PCI
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800452 ---help---
453 This option is needed in order to support SGI Ultraviolet systems.
454 If you don't have one of these, you should say N here.
455
456# Following is an alphabetically sorted list of 32 bit extended platforms
457# Please maintain the alphabetic order if and when there are additions
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100458
Jun Nakajimaddd70cf2013-01-21 17:23:09 +0000459config X86_GOLDFISH
460 bool "Goldfish (Virtual Platform)"
Ben Hutchingscb7b8022013-06-24 01:05:25 +0100461 depends on X86_EXTENDED_PLATFORM
Jun Nakajimaddd70cf2013-01-21 17:23:09 +0000462 ---help---
463 Enable support for the Goldfish virtual platform used primarily
464 for Android development. Unless you are building for the Android
465 Goldfish emulator say N here.
466
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800467config X86_INTEL_CE
468 bool "CE4100 TV platform"
469 depends on PCI
470 depends on PCI_GODIRECT
Jiang Liu6084a6e2014-06-09 16:19:46 +0800471 depends on X86_IO_APIC
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800472 depends on X86_32
473 depends on X86_EXTENDED_PLATFORM
Dirk Brandewie37bc9f52010-11-09 12:08:08 -0800474 select X86_REBOOTFIXUPS
Sebastian Andrzej Siewiorda6b7372011-02-22 21:07:37 +0100475 select OF
476 select OF_EARLY_FLATTREE
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800477 ---help---
478 Select for the Intel CE media processor (CE4100) SOC.
479 This option compiles in support for the CE4100 SOC for settop
480 boxes and media devices.
481
David Cohen4cb9b002013-12-16 17:37:26 -0800482config X86_INTEL_MID
Alan Cox43605ef2011-07-12 17:49:29 +0100483 bool "Intel MID platform support"
484 depends on X86_32
485 depends on X86_EXTENDED_PLATFORM
David Cohenedc6bc72014-01-21 10:41:39 -0800486 depends on X86_PLATFORM_DEVICES
Alan Cox1ea7c672011-11-10 13:29:14 +0000487 depends on PCI
488 depends on PCI_GOANY
489 depends on X86_IO_APIC
Alan Cox7c9c3a12011-12-29 14:43:16 +0000490 select SFI
David Cohen4cb9b002013-12-16 17:37:26 -0800491 select I2C
Alan Cox7c9c3a12011-12-29 14:43:16 +0000492 select DW_APB_TIMER
Alan Cox1ea7c672011-11-10 13:29:14 +0000493 select APB_TIMER
Alan Cox1ea7c672011-11-10 13:29:14 +0000494 select INTEL_SCU_IPC
Mika Westerberg15a713d2012-01-26 17:35:05 +0000495 select MFD_INTEL_MSIC
Alan Cox1ea7c672011-11-10 13:29:14 +0000496 ---help---
David Cohen4cb9b002013-12-16 17:37:26 -0800497 Select to build a kernel capable of supporting Intel MID (Mobile
498 Internet Device) platform systems which do not have the PCI legacy
499 interfaces. If you are building for a PC class system say N here.
Alan Cox1ea7c672011-11-10 13:29:14 +0000500
David Cohen4cb9b002013-12-16 17:37:26 -0800501 Intel MID platforms are based on an Intel processor and chipset which
502 consume less power than most of the x86 derivatives.
Alan Cox43605ef2011-07-12 17:49:29 +0100503
Bryan O'Donoghue8bbc2a12015-01-30 16:29:39 +0000504config X86_INTEL_QUARK
505 bool "Intel Quark platform support"
506 depends on X86_32
507 depends on X86_EXTENDED_PLATFORM
508 depends on X86_PLATFORM_DEVICES
509 depends on X86_TSC
510 depends on PCI
511 depends on PCI_GOANY
512 depends on X86_IO_APIC
513 select IOSF_MBI
514 select INTEL_IMR
Andy Shevchenko9ab6eb52015-03-05 17:24:04 +0200515 select COMMON_CLK
Bryan O'Donoghue8bbc2a12015-01-30 16:29:39 +0000516 ---help---
517 Select to include support for Quark X1000 SoC.
518 Say Y here if you have a Quark based system such as the Arduino
519 compatible Intel Galileo.
520
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000521config X86_INTEL_LPSS
522 bool "Intel Low Power Subsystem Support"
523 depends on ACPI
524 select COMMON_CLK
Mathias Nyman0f531432013-09-13 17:02:29 +0300525 select PINCTRL
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000526 ---help---
527 Select to build support for Intel Low Power Subsystem such as
528 found on Intel Lynxpoint PCH. Selecting this option enables
Mathias Nyman0f531432013-09-13 17:02:29 +0300529 things like clock tree (common clock framework) and pincontrol
530 which are needed by the LPSS peripheral drivers.
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000531
Ken Xue92082a82015-02-06 08:27:51 +0800532config X86_AMD_PLATFORM_DEVICE
533 bool "AMD ACPI2Platform devices support"
534 depends on ACPI
535 select COMMON_CLK
536 select PINCTRL
537 ---help---
538 Select to interpret AMD specific ACPI device to platform device
539 such as I2C, UART, GPIO found on AMD Carrizo and later chipsets.
540 I2C and UART depend on COMMON_CLK to set clock. GPIO driver is
541 implemented under PINCTRL subsystem.
542
David E. Boxced3ce72014-09-17 22:13:50 -0700543config IOSF_MBI
544 tristate "Intel SoC IOSF Sideband support for SoC platforms"
545 depends on PCI
546 ---help---
547 This option enables sideband register access support for Intel SoC
548 platforms. On these platforms the IOSF sideband is used in lieu of
549 MSR's for some register accesses, mostly but not limited to thermal
550 and power. Drivers may query the availability of this device to
551 determine if they need the sideband in order to work on these
552 platforms. The sideband is available on the following SoC products.
553 This list is not meant to be exclusive.
554 - BayTrail
555 - Braswell
556 - Quark
557
558 You should say Y if you are running a kernel on one of these SoC's.
559
David E. Boxed2226b2014-09-17 22:13:51 -0700560config IOSF_MBI_DEBUG
561 bool "Enable IOSF sideband access through debugfs"
562 depends on IOSF_MBI && DEBUG_FS
563 ---help---
564 Select this option to expose the IOSF sideband access registers (MCR,
565 MDR, MCRX) through debugfs to write and read register information from
566 different units on the SoC. This is most useful for obtaining device
567 state information for debug and analysis. As this is a general access
568 mechanism, users of this option would have specific knowledge of the
569 device they want to access.
570
571 If you don't require the option or are in doubt, say N.
572
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800573config X86_RDC321X
574 bool "RDC R-321x SoC"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100575 depends on X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800576 depends on X86_EXTENDED_PLATFORM
577 select M486
578 select X86_REBOOTFIXUPS
579 ---help---
580 This option is needed for RDC R-321x system-on-chip, also known
581 as R-8610-(G).
582 If you don't have one of these chips, you should say N here.
583
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100584config X86_32_NON_STANDARD
Ingo Molnar9c398012009-01-27 18:24:57 +0100585 bool "Support non-standard 32-bit SMP architectures"
586 depends on X86_32 && SMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800587 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100588 ---help---
H. Peter Anvinb5660ba2014-02-25 12:14:06 -0800589 This option compiles in the bigsmp and STA2X11 default
590 subarchitectures. It is intended for a generic binary
591 kernel. If you select them all, kernel will probe it one by
592 one and will fallback to default.
Yinghai Lud49c4282008-06-08 18:31:54 -0700593
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800594# Alphabetically sorted list of Non standard 32 bit platforms
Yinghai Lud49c4282008-06-08 18:31:54 -0700595
Linus Torvaldsd949f362009-09-26 09:35:07 -0700596config X86_SUPPORTS_MEMORY_FAILURE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100597 def_bool y
Linus Torvaldsd949f362009-09-26 09:35:07 -0700598 # MCE code calls memory_failure():
599 depends on X86_MCE
600 # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
Linus Torvaldsd949f362009-09-26 09:35:07 -0700601 # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
602 depends on X86_64 || !SPARSEMEM
603 select ARCH_SUPPORTS_MEMORY_FAILURE
Linus Torvaldsd949f362009-09-26 09:35:07 -0700604
Alessandro Rubini83125a32012-04-04 19:40:21 +0200605config STA2X11
606 bool "STA2X11 Companion Chip Support"
607 depends on X86_32_NON_STANDARD && PCI
608 select X86_DEV_DMA_OPS
609 select X86_DMA_REMAP
610 select SWIOTLB
611 select MFD_STA2X11
612 select ARCH_REQUIRE_GPIOLIB
613 default n
614 ---help---
615 This adds support for boards based on the STA2X11 IO-Hub,
616 a.k.a. "ConneXt". The chip is used in place of the standard
617 PC chipset, so all "standard" peripherals are missing. If this
618 option is selected the kernel will still be able to boot on
619 standard PC machines.
620
Shérab82148d12010-09-25 06:06:57 +0200621config X86_32_IRIS
622 tristate "Eurobraille/Iris poweroff module"
623 depends on X86_32
624 ---help---
625 The Iris machines from EuroBraille do not have APM or ACPI support
626 to shut themselves down properly. A special I/O sequence is
627 needed to do so, which is what this module does at
628 kernel shutdown.
629
630 This is only for Iris machines from EuroBraille.
631
632 If unused, say N.
633
Ingo Molnarae1e9132008-11-11 09:05:16 +0100634config SCHED_OMIT_FRAME_POINTER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100635 def_bool y
636 prompt "Single-depth WCHAN output"
Ken Chena87d0912008-11-06 11:10:49 -0800637 depends on X86
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100638 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100639 Calculate simpler /proc/<PID>/wchan values. If this option
640 is disabled then wchan values will recurse back to the
641 caller function. This provides more accurate wchan values,
642 at the expense of slightly more scheduling overhead.
643
644 If in doubt, say "Y".
645
Borislav Petkov6276a072013-03-04 21:20:21 +0100646menuconfig HYPERVISOR_GUEST
647 bool "Linux guest support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100648 ---help---
Borislav Petkov6276a072013-03-04 21:20:21 +0100649 Say Y here to enable options for running Linux under various hyper-
650 visors. This option enables basic hypervisor detection and platform
651 setup.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100652
Borislav Petkov6276a072013-03-04 21:20:21 +0100653 If you say N, all options in this submenu will be skipped and
654 disabled, and Linux guest support won't be built in.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100655
Borislav Petkov6276a072013-03-04 21:20:21 +0100656if HYPERVISOR_GUEST
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100657
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100658config PARAVIRT
659 bool "Enable paravirtualization code"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100660 ---help---
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100661 This changes the kernel so it can modify itself when it is run
662 under a hypervisor, potentially improving performance significantly
663 over full virtualization. However, when run without a hypervisor
664 the kernel is theoretically slower and slightly larger.
665
Borislav Petkov6276a072013-03-04 21:20:21 +0100666config PARAVIRT_DEBUG
667 bool "paravirt-ops debugging"
668 depends on PARAVIRT && DEBUG_KERNEL
669 ---help---
670 Enable to debug paravirt_ops internals. Specifically, BUG if
671 a paravirt_op is missing when it is called.
672
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700673config PARAVIRT_SPINLOCKS
674 bool "Paravirtualization layer for spinlocks"
Kees Cook6ea30382012-10-02 11:16:47 -0700675 depends on PARAVIRT && SMP
Ingo Molnar62c7a1e2015-05-11 09:47:23 +0200676 select UNINLINE_SPIN_UNLOCK if !QUEUED_SPINLOCKS
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700677 ---help---
678 Paravirtualized spinlocks allow a pvops backend to replace the
679 spinlock implementation with something virtualization-friendly
680 (for example, block the virtual CPU rather than spinning).
681
Raghavendra K T4c4e4f62013-10-21 21:35:08 +0530682 It has a minimal impact on native kernels and gives a nice performance
683 benefit on paravirtualized KVM / Xen kernels.
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700684
Raghavendra K T4c4e4f62013-10-21 21:35:08 +0530685 If you are unsure how to answer this question, answer Y.
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700686
Borislav Petkov6276a072013-03-04 21:20:21 +0100687source "arch/x86/xen/Kconfig"
688
689config KVM_GUEST
690 bool "KVM Guest support (including kvmclock)"
691 depends on PARAVIRT
692 select PARAVIRT_CLOCK
693 default y
694 ---help---
695 This option enables various optimizations for running under the KVM
696 hypervisor. It includes a paravirtualized clock, so that instead
697 of relying on a PIT (or probably other) emulation by the
698 underlying device model, the host provides the guest with
699 timing infrastructure such as time of day, and system time
700
Srivatsa Vaddagiri1e20eb82013-08-09 19:52:01 +0530701config KVM_DEBUG_FS
702 bool "Enable debug information for KVM Guests in debugfs"
703 depends on KVM_GUEST && DEBUG_FS
704 default n
705 ---help---
706 This option enables collection of various statistics for KVM guest.
707 Statistics are displayed in debugfs filesystem. Enabling this option
708 may incur significant overhead.
709
Borislav Petkov6276a072013-03-04 21:20:21 +0100710source "arch/x86/lguest/Kconfig"
711
712config PARAVIRT_TIME_ACCOUNTING
713 bool "Paravirtual steal time accounting"
714 depends on PARAVIRT
715 default n
716 ---help---
717 Select this option to enable fine granularity task steal time
718 accounting. Time spent executing other tasks in parallel with
719 the current vCPU is discounted from the vCPU power. To account for
720 that, there can be a small performance impact.
721
722 If in doubt, say N here.
723
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200724config PARAVIRT_CLOCK
725 bool
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200726
Borislav Petkov6276a072013-03-04 21:20:21 +0100727endif #HYPERVISOR_GUEST
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400728
Yinghai Lu08677212010-02-10 01:20:20 -0800729config NO_BOOTMEM
Yinghai Lu774ea0b2010-08-25 13:39:18 -0700730 def_bool y
Yinghai Lu08677212010-02-10 01:20:20 -0800731
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100732source "arch/x86/Kconfig.cpu"
733
734config HPET_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100735 def_bool X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100736 prompt "HPET Timer Support" if X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100737 ---help---
738 Use the IA-PC HPET (High Precision Event Timer) to manage
739 time in preference to the PIT and RTC, if a HPET is
740 present.
741 HPET is the next generation timer replacing legacy 8254s.
742 The HPET provides a stable time base on SMP
743 systems, unlike the TSC, but it is more expensive to access,
744 as it is off-chip. You can find the HPET spec at
745 <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100746
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100747 You can safely choose Y here. However, HPET will only be
748 activated if the platform and the BIOS support this feature.
749 Otherwise the 8254 will be used for timing services.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100750
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100751 Choose N to continue using the legacy 8254 timer.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100752
753config HPET_EMULATE_RTC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100754 def_bool y
Bernhard Walle9d8af782008-02-06 01:38:52 -0800755 depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100756
Jacob Panbb24c472009-09-02 07:37:17 -0700757config APB_TIMER
Alan Cox933b9462011-12-17 17:43:40 +0000758 def_bool y if X86_INTEL_MID
759 prompt "Intel MID APB Timer Support" if X86_INTEL_MID
Jamie Iles06c3df42011-06-06 12:43:07 +0100760 select DW_APB_TIMER
Alan Coxa0c38322011-12-17 21:57:25 +0000761 depends on X86_INTEL_MID && SFI
Jacob Panbb24c472009-09-02 07:37:17 -0700762 help
763 APB timer is the replacement for 8254, HPET on X86 MID platforms.
764 The APBT provides a stable time base on SMP
765 systems, unlike the TSC, but it is more expensive to access,
766 as it is off-chip. APB timers are always running regardless of CPU
767 C states, they are used as per CPU clockevent device when possible.
768
David Rientjes6a108a12011-01-20 14:44:16 -0800769# Mark as expert because too many people got it wrong.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100770# The code disables itself when not needed.
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700771config DMI
772 default y
Ard Biesheuvelcf074402014-01-23 15:54:39 -0800773 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
David Rientjes6a108a12011-01-20 14:44:16 -0800774 bool "Enable DMI scanning" if EXPERT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100775 ---help---
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700776 Enabled scanning of DMI to identify machine quirks. Say Y
777 here unless you have verified that your setup is not
778 affected by entries in the DMI blacklist. Required by PNP
779 BIOS code.
780
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100781config GART_IOMMU
Andi Kleen38901f12013-10-04 14:37:56 -0700782 bool "Old AMD GART IOMMU support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100783 select SWIOTLB
Andreas Herrmann23ac4ae2010-09-17 18:03:43 +0200784 depends on X86_64 && PCI && AMD_NB
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100785 ---help---
Ingo Molnarced3c422013-10-06 11:45:20 +0200786 Provides a driver for older AMD Athlon64/Opteron/Turion/Sempron
787 GART based hardware IOMMUs.
788
789 The GART supports full DMA access for devices with 32-bit access
790 limitations, on systems with more than 3 GB. This is usually needed
791 for USB, sound, many IDE/SATA chipsets and some other devices.
792
793 Newer systems typically have a modern AMD IOMMU, supported via
794 the CONFIG_AMD_IOMMU=y config option.
795
796 In normal configurations this driver is only active when needed:
797 there's more than 3 GB of memory and the system contains a
798 32-bit limited device.
799
800 If unsure, say Y.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100801
802config CALGARY_IOMMU
803 bool "IBM Calgary IOMMU support"
804 select SWIOTLB
Kees Cook6ea30382012-10-02 11:16:47 -0700805 depends on X86_64 && PCI
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100806 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100807 Support for hardware IOMMUs in IBM's xSeries x366 and x460
808 systems. Needed to run systems with more than 3GB of memory
809 properly with 32-bit PCI devices that do not support DAC
810 (Double Address Cycle). Calgary also supports bus level
811 isolation, where all DMAs pass through the IOMMU. This
812 prevents them from going anywhere except their intended
813 destination. This catches hard-to-find kernel bugs and
814 mis-behaving drivers and devices that do not use the DMA-API
815 properly to set up their DMA buffers. The IOMMU can be
816 turned off at boot time with the iommu=off parameter.
817 Normally the kernel will make the right choice by itself.
818 If unsure, say Y.
819
820config CALGARY_IOMMU_ENABLED_BY_DEFAULT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100821 def_bool y
822 prompt "Should Calgary be enabled by default?"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100823 depends on CALGARY_IOMMU
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100824 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100825 Should Calgary be enabled by default? if you choose 'y', Calgary
826 will be used (if it exists). If you choose 'n', Calgary will not be
827 used even if it exists. If you choose 'n' and would like to use
828 Calgary anyway, pass 'iommu=calgary' on the kernel command line.
829 If unsure, say Y.
830
831# need this always selected by IOMMU for the VIA workaround
832config SWIOTLB
Joerg Roedela1afd012008-11-18 12:44:21 +0100833 def_bool y if X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100834 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100835 Support for software bounce buffers used on x86-64 systems
Joe Millenbach4454d322012-09-02 17:38:20 -0700836 which don't have a hardware IOMMU. Using this PCI devices
837 which can only access 32-bits of memory can be used on systems
838 with more than 3 GB of memory.
839 If unsure, say Y.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100840
FUJITA Tomonoria8522502008-04-29 00:59:36 -0700841config IOMMU_HELPER
Jan Beulich3120e252012-09-10 12:41:45 +0100842 def_bool y
843 depends on CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700844
Mike Travis1184dc22008-05-12 21:21:12 +0200845config MAXSMP
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200846 bool "Enable Maximum number of SMP Processors and NUMA Nodes"
Kees Cook6ea30382012-10-02 11:16:47 -0700847 depends on X86_64 && SMP && DEBUG_KERNEL
Mike Travis36f51012008-12-16 17:33:51 -0800848 select CPUMASK_OFFSTACK
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100849 ---help---
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200850 Enable maximum number of CPUS and NUMA Nodes for this architecture.
Mike Travis1184dc22008-05-12 21:21:12 +0200851 If unsure, say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100852
853config NR_CPUS
Mike Travis36f51012008-12-16 17:33:51 -0800854 int "Maximum number of CPUs" if SMP && !MAXSMP
Michael K. Johnson2a3313f2009-04-21 21:44:48 -0400855 range 2 8 if SMP && X86_32 && !X86_BIGSMP
Josh Boyerbb61ccc2013-11-05 09:37:29 -0500856 range 2 512 if SMP && !MAXSMP && !CPUMASK_OFFSTACK
Josh Boyerb53b5ed2013-11-05 09:38:16 -0500857 range 2 8192 if SMP && !MAXSMP && CPUMASK_OFFSTACK && X86_64
Mike Travis78637a972008-12-16 17:34:00 -0800858 default "1" if !SMP
Josh Boyerb53b5ed2013-11-05 09:38:16 -0500859 default "8192" if MAXSMP
H. Peter Anvinb5660ba2014-02-25 12:14:06 -0800860 default "32" if SMP && X86_BIGSMP
Kirill A. Shutemovc5c19942015-05-08 13:25:45 +0300861 default "8" if SMP && X86_32
862 default "64" if SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100863 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100864 This allows you to specify the maximum number of CPUs which this
Josh Boyerbb61ccc2013-11-05 09:37:29 -0500865 kernel will support. If CPUMASK_OFFSTACK is enabled, the maximum
Kirill A. Shutemovcad14bb2015-05-08 13:25:26 +0300866 supported value is 8192, otherwise the maximum value is 512. The
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100867 minimum value which makes sense is 2.
868
869 This is purely to save memory - each supported CPU adds
870 approximately eight kilobytes to the kernel image.
871
872config SCHED_SMT
873 bool "SMT (Hyperthreading) scheduler support"
Borislav Petkovc8e56d22015-06-04 18:55:25 +0200874 depends on SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100875 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100876 SMT scheduler support improves the CPU scheduler's decision making
877 when dealing with Intel Pentium 4 chips with HyperThreading at a
878 cost of slightly increased overhead in some places. If unsure say
879 N here.
880
881config SCHED_MC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100882 def_bool y
883 prompt "Multi-core scheduler support"
Borislav Petkovc8e56d22015-06-04 18:55:25 +0200884 depends on SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100885 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100886 Multi-core scheduler support improves the CPU scheduler's decision
887 making when dealing with multi-core CPU chips at a cost of slightly
888 increased overhead in some places. If unsure say N here.
889
890source "kernel/Kconfig.preempt"
891
Thomas Gleixner30b8b002015-01-15 21:22:39 +0000892config UP_LATE_INIT
893 def_bool y
Thomas Gleixnerba360f8872015-01-24 10:34:46 +0100894 depends on !SMP && X86_LOCAL_APIC
Thomas Gleixner30b8b002015-01-15 21:22:39 +0000895
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100896config X86_UP_APIC
Jan Beulich50849ee2015-02-05 15:31:56 +0000897 bool "Local APIC support on uniprocessors" if !PCI_MSI
898 default PCI_MSI
Bryan O'Donoghue38a1dfd2015-01-22 22:58:49 +0000899 depends on X86_32 && !SMP && !X86_32_NON_STANDARD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100900 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100901 A local APIC (Advanced Programmable Interrupt Controller) is an
902 integrated interrupt controller in the CPU. If you have a single-CPU
903 system which has a processor with a local APIC, you can say Y here to
904 enable and use it. If you say Y here even though your machine doesn't
905 have a local APIC, then the kernel will still run with no slowdown at
906 all. The local APIC supports CPU-generated self-interrupts (timer,
907 performance counters), and the NMI watchdog which detects hard
908 lockups.
909
910config X86_UP_IOAPIC
911 bool "IO-APIC support on uniprocessors"
912 depends on X86_UP_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100913 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100914 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
915 SMP-capable replacement for PC-style interrupt controllers. Most
916 SMP systems and many recent uniprocessor systems have one.
917
918 If you have a single-CPU system with an IO-APIC, you can say Y here
919 to use it. If you say Y here even though your machine doesn't have
920 an IO-APIC, then the kernel will still run with no slowdown at all.
921
922config X86_LOCAL_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100923 def_bool y
Thomas Petazzoni0dbc6072013-10-03 11:59:14 +0200924 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC || PCI_MSI
Jiang Liub5dc8e62015-04-13 14:11:24 +0800925 select IRQ_DOMAIN_HIERARCHY
Jiang Liu52f518a2015-04-13 14:11:35 +0800926 select PCI_MSI_IRQ_DOMAIN if PCI_MSI
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100927
928config X86_IO_APIC
Jan Beulichb1da1e72015-02-05 15:35:21 +0000929 def_bool y
930 depends on X86_LOCAL_APIC || X86_UP_IOAPIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100931
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200932config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
933 bool "Reroute for broken boot IRQs"
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200934 depends on X86_IO_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100935 ---help---
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200936 This option enables a workaround that fixes a source of
937 spurious interrupts. This is recommended when threaded
938 interrupt handling is used on systems where the generation of
939 superfluous "boot interrupts" cannot be disabled.
940
941 Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
942 entry in the chipset's IO-APIC is masked (as, e.g. the RT
943 kernel does during interrupt handling). On chipsets where this
944 boot IRQ generation cannot be disabled, this workaround keeps
945 the original IRQ line masked so that only the equivalent "boot
946 IRQ" is delivered to the CPUs. The workaround also tells the
947 kernel to set up the IRQ handler on the boot IRQ line. In this
948 way only one interrupt is delivered to the kernel. Otherwise
949 the spurious second interrupt may cause the kernel to bring
950 down (vital) interrupt lines.
951
952 Only affects "broken" chipsets. Interrupt sharing may be
953 increased on these systems.
954
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100955config X86_MCE
Andi Kleenbab9bc62009-07-09 00:31:38 +0200956 bool "Machine Check / overheating reporting"
Borislav Petkove57dbaf2011-09-13 15:23:21 +0200957 default y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100958 ---help---
Andi Kleenbab9bc62009-07-09 00:31:38 +0200959 Machine Check support allows the processor to notify the
960 kernel if it detects a problem (e.g. overheating, data corruption).
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100961 The action the kernel takes depends on the severity of the problem,
Andi Kleenbab9bc62009-07-09 00:31:38 +0200962 ranging from warning messages to halting the machine.
Andi Kleen4efc0672009-04-28 19:07:31 +0200963
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100964config X86_MCE_INTEL
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100965 def_bool y
966 prompt "Intel MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +0200967 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100968 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100969 Additional support for intel specific MCE features such as
970 the thermal monitor.
971
972config X86_MCE_AMD
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100973 def_bool y
974 prompt "AMD MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +0200975 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100976 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100977 Additional support for AMD specific MCE features such as
978 the DRAM Error Threshold.
979
Andi Kleen4efc0672009-04-28 19:07:31 +0200980config X86_ANCIENT_MCE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100981 bool "Support for old Pentium 5 / WinChip machine checks"
Andi Kleenc31d9632009-07-09 00:31:37 +0200982 depends on X86_32 && X86_MCE
Hidetoshi Setocd13adcc2009-05-27 16:57:31 +0900983 ---help---
984 Include support for machine check handling on old Pentium 5 or WinChip
Masanari Iida5065a702013-11-30 21:38:43 +0900985 systems. These typically need to be enabled explicitly on the command
Hidetoshi Setocd13adcc2009-05-27 16:57:31 +0900986 line.
Andi Kleen4efc0672009-04-28 19:07:31 +0200987
Andi Kleenb2762682009-02-12 13:49:31 +0100988config X86_MCE_THRESHOLD
989 depends on X86_MCE_AMD || X86_MCE_INTEL
Jan Beulich6fc108a2010-04-21 15:23:44 +0100990 def_bool y
Andi Kleenb2762682009-02-12 13:49:31 +0100991
Andi Kleenea149b32009-04-29 19:31:00 +0200992config X86_MCE_INJECT
Andi Kleenc1ebf832009-07-09 00:31:41 +0200993 depends on X86_MCE
Andi Kleenea149b32009-04-29 19:31:00 +0200994 tristate "Machine check injector support"
995 ---help---
996 Provide support for injecting machine checks for testing purposes.
997 If you don't know what a machine check is and you don't do kernel
998 QA it is safe to say n.
999
Andi Kleen4efc0672009-04-28 19:07:31 +02001000config X86_THERMAL_VECTOR
1001 def_bool y
Andi Kleen5bb38ad2009-07-09 00:31:39 +02001002 depends on X86_MCE_INTEL
Andi Kleen4efc0672009-04-28 19:07:31 +02001003
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001004config VM86
David Rientjes6a108a12011-01-20 14:44:16 -08001005 bool "Enable VM86 support" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001006 default y
1007 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001008 ---help---
H. Peter Anvin34273f42014-05-04 10:36:22 -07001009 This option is required by programs like DOSEMU to run
1010 16-bit real mode legacy code on x86 processors. It also may
1011 be needed by software like XFree86 to initialize some video
1012 cards via BIOS. Disabling this option saves about 6K.
1013
1014config X86_16BIT
1015 bool "Enable support for 16-bit segments" if EXPERT
1016 default y
1017 ---help---
1018 This option is required by programs like Wine to run 16-bit
1019 protected mode legacy code on x86 processors. Disabling
1020 this option saves about 300 bytes on i386, or around 6K text
1021 plus 16K runtime memory on x86-64,
1022
1023config X86_ESPFIX32
1024 def_bool y
1025 depends on X86_16BIT && X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001026
H. Peter Anvin197725d2014-05-04 10:00:49 -07001027config X86_ESPFIX64
1028 def_bool y
H. Peter Anvin34273f42014-05-04 10:36:22 -07001029 depends on X86_16BIT && X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001030
Andy Lutomirski1ad83c82014-10-29 14:33:47 -07001031config X86_VSYSCALL_EMULATION
1032 bool "Enable vsyscall emulation" if EXPERT
1033 default y
1034 depends on X86_64
1035 ---help---
1036 This enables emulation of the legacy vsyscall page. Disabling
1037 it is roughly equivalent to booting with vsyscall=none, except
1038 that it will also disable the helpful warning if a program
1039 tries to use a vsyscall. With this option set to N, offending
1040 programs will just segfault, citing addresses of the form
1041 0xffffffffff600?00.
1042
1043 This option is required by many programs built before 2013, and
1044 care should be used even with newer programs if set to N.
1045
1046 Disabling this option saves about 7K of kernel size and
1047 possibly 4K of additional runtime pagetable memory.
1048
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001049config TOSHIBA
1050 tristate "Toshiba Laptop support"
1051 depends on X86_32
1052 ---help---
1053 This adds a driver to safely access the System Management Mode of
1054 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
1055 not work on models with a Phoenix BIOS. The System Management Mode
1056 is used to set the BIOS and power saving options on Toshiba portables.
1057
1058 For information on utilities to make use of this driver see the
1059 Toshiba Linux utilities web site at:
1060 <http://www.buzzard.org.uk/toshiba/>.
1061
1062 Say Y if you intend to run this kernel on a Toshiba portable.
1063 Say N otherwise.
1064
1065config I8K
Pali Rohár039ae582015-05-14 13:16:37 +02001066 tristate "Dell i8k legacy laptop support"
Jean Delvare949a9d72011-05-25 20:43:33 +02001067 select HWMON
Pali Rohár039ae582015-05-14 13:16:37 +02001068 select SENSORS_DELL_SMM
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001069 ---help---
Pali Rohár039ae582015-05-14 13:16:37 +02001070 This option enables legacy /proc/i8k userspace interface in hwmon
1071 dell-smm-hwmon driver. Character file /proc/i8k reports bios version,
1072 temperature and allows controlling fan speeds of Dell laptops via
1073 System Management Mode. For old Dell laptops (like Dell Inspiron 8000)
1074 it reports also power and hotkey status. For fan speed control is
1075 needed userspace package i8kutils.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001076
Pali Rohár039ae582015-05-14 13:16:37 +02001077 Say Y if you intend to run this kernel on old Dell laptops or want to
1078 use userspace package i8kutils.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001079 Say N otherwise.
1080
1081config X86_REBOOTFIXUPS
Jan Beulich9ba16082008-10-15 22:01:38 -07001082 bool "Enable X86 board specific fixups for reboot"
1083 depends on X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001084 ---help---
1085 This enables chipset and/or board specific fixups to be done
1086 in order to get reboot to work correctly. This is only needed on
1087 some combinations of hardware and BIOS. The symptom, for which
1088 this config is intended, is when reboot ends with a stalled/hung
1089 system.
1090
1091 Currently, the only fixup is for the Geode machines using
Florian Fainelli5e3a77e2008-01-30 13:33:36 +01001092 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001093
1094 Say Y if you want to enable the fixup. Currently, it's safe to
1095 enable this option even if you don't need it.
1096 Say N otherwise.
1097
1098config MICROCODE
Borislav Petkove43f6e62012-08-01 19:17:01 +02001099 tristate "CPU microcode loading support"
Borislav Petkov80030e32013-10-13 18:36:29 +02001100 depends on CPU_SUP_AMD || CPU_SUP_INTEL
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001101 select FW_LOADER
1102 ---help---
Borislav Petkove43f6e62012-08-01 19:17:01 +02001103
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001104 If you say Y here, you will be able to update the microcode on
Peter Oruba80cc9f12008-07-28 18:44:22 +02001105 certain Intel and AMD processors. The Intel support is for the
Borislav Petkove43f6e62012-08-01 19:17:01 +02001106 IA32 family, e.g. Pentium Pro, Pentium II, Pentium III, Pentium 4,
1107 Xeon etc. The AMD support is for families 0x10 and later. You will
1108 obviously need the actual microcode binary data itself which is not
1109 shipped with the Linux kernel.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001110
Peter Oruba8d86f392008-07-28 18:44:21 +02001111 This option selects the general module only, you need to select
1112 at least one vendor specific module as well.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001113
Borislav Petkove43f6e62012-08-01 19:17:01 +02001114 To compile this driver as a module, choose M here: the module
1115 will be called microcode.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001116
Peter Oruba8d86f392008-07-28 18:44:21 +02001117config MICROCODE_INTEL
Borislav Petkove43f6e62012-08-01 19:17:01 +02001118 bool "Intel microcode loading support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001119 depends on MICROCODE
1120 default MICROCODE
1121 select FW_LOADER
1122 ---help---
1123 This options enables microcode patch loading support for Intel
1124 processors.
Peter Oruba8d86f392008-07-28 18:44:21 +02001125
Alanb8989db2014-01-20 18:01:56 +00001126 For the current Intel microcode data package go to
1127 <https://downloadcenter.intel.com> and search for
1128 'Linux Processor Microcode Data File'.
Peter Oruba8d86f392008-07-28 18:44:21 +02001129
Peter Oruba80cc9f12008-07-28 18:44:22 +02001130config MICROCODE_AMD
Borislav Petkove43f6e62012-08-01 19:17:01 +02001131 bool "AMD microcode loading support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001132 depends on MICROCODE
1133 select FW_LOADER
1134 ---help---
1135 If you select this option, microcode patch loading support for AMD
1136 processors will be enabled.
Peter Oruba80cc9f12008-07-28 18:44:22 +02001137
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001138config MICROCODE_OLD_INTERFACE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001139 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001140 depends on MICROCODE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001141
Fenghua Yuda76f642012-12-20 23:44:32 -08001142config MICROCODE_INTEL_EARLY
Jan Beuliche0fd24a2015-02-05 15:39:34 +00001143 bool
Jacob Shin757885e2013-05-30 14:09:19 -05001144
1145config MICROCODE_AMD_EARLY
Jan Beuliche0fd24a2015-02-05 15:39:34 +00001146 bool
Jacob Shin757885e2013-05-30 14:09:19 -05001147
1148config MICROCODE_EARLY
Fenghua Yuda76f642012-12-20 23:44:32 -08001149 bool "Early load microcode"
Jacob Shin6b3389a2013-05-31 01:53:24 -05001150 depends on MICROCODE=y && BLK_DEV_INITRD
Jacob Shin757885e2013-05-30 14:09:19 -05001151 select MICROCODE_INTEL_EARLY if MICROCODE_INTEL
1152 select MICROCODE_AMD_EARLY if MICROCODE_AMD
Fenghua Yuda76f642012-12-20 23:44:32 -08001153 default y
1154 help
1155 This option provides functionality to read additional microcode data
1156 at the beginning of initrd image. The data tells kernel to load
1157 microcode to CPU's as early as possible. No functional change if no
1158 microcode data is glued to the initrd, therefore it's safe to say Y.
1159
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001160config X86_MSR
1161 tristate "/dev/cpu/*/msr - Model-specific register support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001162 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001163 This device gives privileged processes access to the x86
1164 Model-Specific Registers (MSRs). It is a character device with
1165 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
1166 MSR accesses are directed to a specific CPU on multi-processor
1167 systems.
1168
1169config X86_CPUID
1170 tristate "/dev/cpu/*/cpuid - CPU information support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001171 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001172 This device gives processes access to the x86 CPUID instruction to
1173 be executed on a specific processor. It is a character device
1174 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
1175 /dev/cpu/31/cpuid.
1176
1177choice
1178 prompt "High Memory Support"
Jan Beulich6fc108a2010-04-21 15:23:44 +01001179 default HIGHMEM4G
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001180 depends on X86_32
1181
1182config NOHIGHMEM
1183 bool "off"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001184 ---help---
1185 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
1186 However, the address space of 32-bit x86 processors is only 4
1187 Gigabytes large. That means that, if you have a large amount of
1188 physical memory, not all of it can be "permanently mapped" by the
1189 kernel. The physical memory that's not permanently mapped is called
1190 "high memory".
1191
1192 If you are compiling a kernel which will never run on a machine with
1193 more than 1 Gigabyte total physical RAM, answer "off" here (default
1194 choice and suitable for most users). This will result in a "3GB/1GB"
1195 split: 3GB are mapped so that each process sees a 3GB virtual memory
1196 space and the remaining part of the 4GB virtual memory space is used
1197 by the kernel to permanently map as much physical memory as
1198 possible.
1199
1200 If the machine has between 1 and 4 Gigabytes physical RAM, then
1201 answer "4GB" here.
1202
1203 If more than 4 Gigabytes is used then answer "64GB" here. This
1204 selection turns Intel PAE (Physical Address Extension) mode on.
1205 PAE implements 3-level paging on IA32 processors. PAE is fully
1206 supported by Linux, PAE mode is implemented on all recent Intel
1207 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
1208 then the kernel will not boot on CPUs that don't support PAE!
1209
1210 The actual amount of total physical memory will either be
1211 auto detected or can be forced by using a kernel command line option
1212 such as "mem=256M". (Try "man bootparam" or see the documentation of
1213 your boot loader (lilo or loadlin) about how to pass options to the
1214 kernel at boot time.)
1215
1216 If unsure, say "off".
1217
1218config HIGHMEM4G
1219 bool "4GB"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001220 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001221 Select this if you have a 32-bit processor and between 1 and 4
1222 gigabytes of physical RAM.
1223
1224config HIGHMEM64G
1225 bool "64GB"
H. Peter Anvineb068e72012-11-28 11:50:23 -08001226 depends on !M486
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001227 select X86_PAE
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001228 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001229 Select this if you have a 32-bit processor and more than 4
1230 gigabytes of physical RAM.
1231
1232endchoice
1233
1234choice
David Rientjes6a108a12011-01-20 14:44:16 -08001235 prompt "Memory split" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001236 default VMSPLIT_3G
1237 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001238 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001239 Select the desired split between kernel and user memory.
1240
1241 If the address range available to the kernel is less than the
1242 physical memory installed, the remaining memory will be available
1243 as "high memory". Accessing high memory is a little more costly
1244 than low memory, as it needs to be mapped into the kernel first.
1245 Note that increasing the kernel address space limits the range
1246 available to user programs, making the address space there
1247 tighter. Selecting anything other than the default 3G/1G split
1248 will also likely make your kernel incompatible with binary-only
1249 kernel modules.
1250
1251 If you are not absolutely sure what you are doing, leave this
1252 option alone!
1253
1254 config VMSPLIT_3G
1255 bool "3G/1G user/kernel split"
1256 config VMSPLIT_3G_OPT
1257 depends on !X86_PAE
1258 bool "3G/1G user/kernel split (for full 1G low memory)"
1259 config VMSPLIT_2G
1260 bool "2G/2G user/kernel split"
1261 config VMSPLIT_2G_OPT
1262 depends on !X86_PAE
1263 bool "2G/2G user/kernel split (for full 2G low memory)"
1264 config VMSPLIT_1G
1265 bool "1G/3G user/kernel split"
1266endchoice
1267
1268config PAGE_OFFSET
1269 hex
1270 default 0xB0000000 if VMSPLIT_3G_OPT
1271 default 0x80000000 if VMSPLIT_2G
1272 default 0x78000000 if VMSPLIT_2G_OPT
1273 default 0x40000000 if VMSPLIT_1G
1274 default 0xC0000000
1275 depends on X86_32
1276
1277config HIGHMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001278 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001279 depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001280
1281config X86_PAE
Jan Beulich9ba16082008-10-15 22:01:38 -07001282 bool "PAE (Physical Address Extension) Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001283 depends on X86_32 && !HIGHMEM4G
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001284 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001285 PAE is required for NX support, and furthermore enables
1286 larger swapspace support for non-overcommit purposes. It
1287 has the cost of more pagetable lookup overhead, and also
1288 consumes more pagetable space per process.
1289
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001290config ARCH_PHYS_ADDR_T_64BIT
Jan Beulich3120e252012-09-10 12:41:45 +01001291 def_bool y
1292 depends on X86_64 || X86_PAE
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001293
FUJITA Tomonori66f2b062010-10-20 15:55:35 -07001294config ARCH_DMA_ADDR_T_64BIT
Jan Beulich3120e252012-09-10 12:41:45 +01001295 def_bool y
1296 depends on X86_64 || HIGHMEM64G
FUJITA Tomonori66f2b062010-10-20 15:55:35 -07001297
Ingo Molnar10971ab2015-03-05 08:18:23 +01001298config X86_DIRECT_GBPAGES
Luis R. Rodrigueze5008ab2015-03-04 17:24:12 -08001299 def_bool y
1300 depends on X86_64 && !DEBUG_PAGEALLOC && !KMEMCHECK
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001301 ---help---
Ingo Molnar10971ab2015-03-05 08:18:23 +01001302 Certain kernel features effectively disable kernel
1303 linear 1 GB mappings (even if the CPU otherwise
1304 supports them), so don't confuse the user by printing
1305 that we have them enabled.
Nick Piggin9e899812008-10-22 12:33:16 +02001306
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001307# Common NUMA Features
1308config NUMA
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001309 bool "Numa Memory Allocation and Scheduler Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001310 depends on SMP
H. Peter Anvinb5660ba2014-02-25 12:14:06 -08001311 depends on X86_64 || (X86_32 && HIGHMEM64G && X86_BIGSMP)
1312 default y if X86_BIGSMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001313 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001314 Enable NUMA (Non Uniform Memory Access) support.
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001315
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001316 The kernel will try to allocate memory used by a CPU on the
1317 local memory controller of the CPU and add some more
1318 NUMA awareness to the kernel.
1319
Ingo Molnarc280ea52008-11-08 13:29:45 +01001320 For 64-bit this is recommended if the system is Intel Core i7
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001321 (or later), AMD Opteron, or EM64T NUMA.
1322
H. Peter Anvinb5660ba2014-02-25 12:14:06 -08001323 For 32-bit this is only needed if you boot a 32-bit
David Rientjes7cf6c942014-02-11 18:11:13 -08001324 kernel on a 64-bit NUMA platform.
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001325
1326 Otherwise, you should say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001327
Hans Rosenfeldeec1d4f2010-10-29 17:14:30 +02001328config AMD_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001329 def_bool y
1330 prompt "Old style AMD Opteron NUMA detection"
Tejun Heo5da0ef92011-07-11 10:34:32 +02001331 depends on X86_64 && NUMA && PCI
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001332 ---help---
Hans Rosenfeldeec1d4f2010-10-29 17:14:30 +02001333 Enable AMD NUMA node topology detection. You should say Y here if
1334 you have a multi processor AMD system. This uses an old method to
1335 read the NUMA configuration directly from the builtin Northbridge
1336 of Opteron. It is recommended to use X86_64_ACPI_NUMA instead,
1337 which also takes priority if both are compiled in.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001338
1339config X86_64_ACPI_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001340 def_bool y
1341 prompt "ACPI NUMA detection"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001342 depends on X86_64 && NUMA && ACPI && PCI
1343 select ACPI_NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001344 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001345 Enable ACPI SRAT based node topology detection.
1346
Suresh Siddha6ec6e0d2008-03-25 10:14:35 -07001347# Some NUMA nodes have memory ranges that span
1348# other nodes. Even though a pfn is valid and
1349# between a node's start and end pfns, it may not
1350# reside on that node. See memmap_init_zone()
1351# for details.
1352config NODES_SPAN_OTHER_NODES
1353 def_bool y
1354 depends on X86_64_ACPI_NUMA
1355
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001356config NUMA_EMU
1357 bool "NUMA emulation"
Tejun Heo1b7e03e2011-05-02 17:24:48 +02001358 depends on NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001359 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001360 Enable NUMA emulation. A flat machine will be split
1361 into virtual nodes when booted with "numa=fake=N", where N is the
1362 number of nodes. This is only useful for debugging.
1363
1364config NODES_SHIFT
Linus Torvaldsd25e26b2008-08-25 14:15:38 -07001365 int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
David Rientjes51591e32010-03-25 15:39:27 -07001366 range 1 10
1367 default "10" if MAXSMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001368 default "6" if X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001369 default "3"
1370 depends on NEED_MULTIPLE_NODES
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001371 ---help---
Mike Travis1184dc22008-05-12 21:21:12 +02001372 Specify the maximum number of NUMA Nodes available on the target
Matt LaPlante692105b2009-01-26 11:12:25 +01001373 system. Increases memory reserved to accommodate various tables.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001374
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001375config ARCH_HAVE_MEMORY_PRESENT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001376 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001377 depends on X86_32 && DISCONTIGMEM
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001378
1379config NEED_NODE_MEMMAP_SIZE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001380 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001381 depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001382
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001383config ARCH_FLATMEM_ENABLE
1384 def_bool y
Tejun Heo3b166512011-04-01 11:15:12 +02001385 depends on X86_32 && !NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001386
1387config ARCH_DISCONTIGMEM_ENABLE
1388 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001389 depends on NUMA && X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001390
1391config ARCH_DISCONTIGMEM_DEFAULT
1392 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001393 depends on NUMA && X86_32
1394
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001395config ARCH_SPARSEMEM_ENABLE
1396 def_bool y
Kees Cook6ea30382012-10-02 11:16:47 -07001397 depends on X86_64 || NUMA || X86_32 || X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001398 select SPARSEMEM_STATIC if X86_32
1399 select SPARSEMEM_VMEMMAP_ENABLE if X86_64
1400
Tejun Heo3b166512011-04-01 11:15:12 +02001401config ARCH_SPARSEMEM_DEFAULT
1402 def_bool y
1403 depends on X86_64
1404
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001405config ARCH_SELECT_MEMORY_MODEL
1406 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001407 depends on ARCH_SPARSEMEM_ENABLE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001408
1409config ARCH_MEMORY_PROBE
Toshi Kania0842b72013-07-19 11:47:48 -06001410 bool "Enable sysfs memory/probe interface"
Jan Beulich3120e252012-09-10 12:41:45 +01001411 depends on X86_64 && MEMORY_HOTPLUG
Toshi Kania0842b72013-07-19 11:47:48 -06001412 help
1413 This option enables a sysfs memory/probe interface for testing.
1414 See Documentation/memory-hotplug.txt for more information.
1415 If you are unsure how to answer this question, answer N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001416
Tejun Heo3b166512011-04-01 11:15:12 +02001417config ARCH_PROC_KCORE_TEXT
1418 def_bool y
1419 depends on X86_64 && PROC_KCORE
1420
Avi Kivitya29815a2010-01-10 16:28:09 +02001421config ILLEGAL_POINTER_VALUE
1422 hex
1423 default 0 if X86_32
1424 default 0xdead000000000000 if X86_64
1425
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001426source "mm/Kconfig"
1427
Christoph Hellwigec776ef2015-04-01 09:12:18 +02001428config X86_PMEM_LEGACY
1429 bool "Support non-standard NVDIMMs and ADR protected memory"
Dan Williams9f53f9f2015-06-09 15:33:45 -04001430 depends on PHYS_ADDR_T_64BIT
1431 depends on BLK_DEV
1432 select LIBNVDIMM
Christoph Hellwigec776ef2015-04-01 09:12:18 +02001433 help
1434 Treat memory marked using the non-standard e820 type of 12 as used
1435 by the Intel Sandy Bridge-EP reference BIOS as protected memory.
1436 The kernel will offer these regions to the 'pmem' driver so
1437 they can be used for persistent storage.
1438
1439 Say Y if unsure.
1440
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001441config HIGHPTE
1442 bool "Allocate 3rd-level pagetables from highmem"
Jan Beulich6fc108a2010-04-21 15:23:44 +01001443 depends on HIGHMEM
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001444 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001445 The VM uses one page table entry for each page of physical memory.
1446 For systems with a lot of RAM, this can be wasteful of precious
1447 low memory. Setting this option will put user-space page table
1448 entries in high memory.
1449
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001450config X86_CHECK_BIOS_CORRUPTION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001451 bool "Check for low memory corruption"
1452 ---help---
1453 Periodically check for memory corruption in low memory, which
1454 is suspected to be caused by BIOS. Even when enabled in the
1455 configuration, it is disabled at runtime. Enable it by
1456 setting "memory_corruption_check=1" on the kernel command
1457 line. By default it scans the low 64k of memory every 60
1458 seconds; see the memory_corruption_check_size and
1459 memory_corruption_check_period parameters in
1460 Documentation/kernel-parameters.txt to adjust this.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001461
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001462 When enabled with the default parameters, this option has
1463 almost no overhead, as it reserves a relatively small amount
1464 of memory and scans it infrequently. It both detects corruption
1465 and prevents it from affecting the running system.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001466
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001467 It is, however, intended as a diagnostic tool; if repeatable
1468 BIOS-originated corruption always affects the same memory,
1469 you can use memmap= to prevent the kernel from using that
1470 memory.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001471
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001472config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001473 bool "Set the default setting of memory_corruption_check"
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001474 depends on X86_CHECK_BIOS_CORRUPTION
1475 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001476 ---help---
1477 Set whether the default state of memory_corruption_check is
1478 on or off.
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001479
H. Peter Anvin9ea77bd2010-08-25 16:38:20 -07001480config X86_RESERVE_LOW
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001481 int "Amount of low memory, in kilobytes, to reserve for the BIOS"
1482 default 64
1483 range 4 640
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001484 ---help---
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001485 Specify the amount of low memory to reserve for the BIOS.
Ingo Molnarfc381512008-09-16 10:07:34 +02001486
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001487 The first page contains BIOS data structures that the kernel
1488 must not use, so that page must always be reserved.
Ingo Molnarfc381512008-09-16 10:07:34 +02001489
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001490 By default we reserve the first 64K of physical RAM, as a
1491 number of BIOSes are known to corrupt that memory range
1492 during events such as suspend/resume or monitor cable
1493 insertion, so it must not be used by the kernel.
Ingo Molnarfc381512008-09-16 10:07:34 +02001494
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001495 You can set this to 4 if you are absolutely sure that you
1496 trust the BIOS to get all its memory reservations and usages
1497 right. If you know your BIOS have problems beyond the
1498 default 64K area, you can set this to 640 to avoid using the
1499 entire low memory range.
1500
1501 If you have doubts about the BIOS (e.g. suspend/resume does
1502 not work or there's kernel crashes after certain hardware
1503 hotplug events) then you might want to enable
1504 X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check
1505 typical corruption patterns.
1506
1507 Leave this to the default value of 64 if you are unsure.
Ingo Molnarfc381512008-09-16 10:07:34 +02001508
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001509config MATH_EMULATION
1510 bool
1511 prompt "Math emulation" if X86_32
1512 ---help---
1513 Linux can emulate a math coprocessor (used for floating point
1514 operations) if you don't have one. 486DX and Pentium processors have
1515 a math coprocessor built in, 486SX and 386 do not, unless you added
1516 a 487DX or 387, respectively. (The messages during boot time can
1517 give you some hints here ["man dmesg"].) Everyone needs either a
1518 coprocessor or this emulation.
1519
1520 If you don't have a math coprocessor, you need to say Y here; if you
1521 say Y here even though you have a coprocessor, the coprocessor will
1522 be used nevertheless. (This behavior can be changed with the kernel
1523 command line option "no387", which comes handy if your coprocessor
1524 is broken. Try "man bootparam" or see the documentation of your boot
1525 loader (lilo or loadlin) about how to pass options to the kernel at
1526 boot time.) This means that it is a good idea to say Y here if you
1527 intend to use this kernel on different machines.
1528
1529 More information about the internals of the Linux math coprocessor
1530 emulation can be found in <file:arch/x86/math-emu/README>.
1531
1532 If you are not sure, say Y; apart from resulting in a 66 KB bigger
1533 kernel, it won't hurt.
1534
1535config MTRR
Jan Beulich6fc108a2010-04-21 15:23:44 +01001536 def_bool y
David Rientjes6a108a12011-01-20 14:44:16 -08001537 prompt "MTRR (Memory Type Range Register) support" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001538 ---help---
1539 On Intel P6 family processors (Pentium Pro, Pentium II and later)
1540 the Memory Type Range Registers (MTRRs) may be used to control
1541 processor access to memory ranges. This is most useful if you have
1542 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
1543 allows bus write transfers to be combined into a larger transfer
1544 before bursting over the PCI/AGP bus. This can increase performance
1545 of image write operations 2.5 times or more. Saying Y here creates a
1546 /proc/mtrr file which may be used to manipulate your processor's
1547 MTRRs. Typically the X server should use this.
1548
1549 This code has a reasonably generic interface so that similar
1550 control registers on other processors can be easily supported
1551 as well:
1552
1553 The Cyrix 6x86, 6x86MX and M II processors have Address Range
1554 Registers (ARRs) which provide a similar functionality to MTRRs. For
1555 these, the ARRs are used to emulate the MTRRs.
1556 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
1557 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
1558 write-combining. All of these processors are supported by this code
1559 and it makes sense to say Y here if you have one of them.
1560
1561 Saying Y here also fixes a problem with buggy SMP BIOSes which only
1562 set the MTRRs for the boot CPU and not for the secondary CPUs. This
1563 can lead to all sorts of problems, so it's good to say Y here.
1564
1565 You can safely say Y even if your machine doesn't have MTRRs, you'll
1566 just add about 9 KB to your kernel.
1567
Randy Dunlap7225e752008-07-26 17:54:22 -07001568 See <file:Documentation/x86/mtrr.txt> for more information.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001569
Yinghai Lu95ffa242008-04-29 03:52:33 -07001570config MTRR_SANITIZER
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001571 def_bool y
Yinghai Lu95ffa242008-04-29 03:52:33 -07001572 prompt "MTRR cleanup support"
1573 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001574 ---help---
Thomas Gleixneraba37282008-07-15 14:48:48 +02001575 Convert MTRR layout from continuous to discrete, so X drivers can
1576 add writeback entries.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001577
Thomas Gleixneraba37282008-07-15 14:48:48 +02001578 Can be disabled with disable_mtrr_cleanup on the kernel command line.
Matt LaPlante692105b2009-01-26 11:12:25 +01001579 The largest mtrr entry size for a continuous block can be set with
Thomas Gleixneraba37282008-07-15 14:48:48 +02001580 mtrr_chunk_size.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001581
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001582 If unsure, say Y.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001583
1584config MTRR_SANITIZER_ENABLE_DEFAULT
Yinghai Luf5098d62008-04-29 20:25:58 -07001585 int "MTRR cleanup enable value (0-1)"
1586 range 0 1
1587 default "0"
Yinghai Lu95ffa242008-04-29 03:52:33 -07001588 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001589 ---help---
Yinghai Luf5098d62008-04-29 20:25:58 -07001590 Enable mtrr cleanup default value
Yinghai Lu95ffa242008-04-29 03:52:33 -07001591
Yinghai Lu12031a62008-05-02 02:40:22 -07001592config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
1593 int "MTRR cleanup spare reg num (0-7)"
1594 range 0 7
1595 default "1"
1596 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001597 ---help---
Yinghai Lu12031a62008-05-02 02:40:22 -07001598 mtrr cleanup spare entries default, it can be changed via
Thomas Gleixneraba37282008-07-15 14:48:48 +02001599 mtrr_spare_reg_nr=N on the kernel command line.
Yinghai Lu12031a62008-05-02 02:40:22 -07001600
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001601config X86_PAT
Jan Beulich6fc108a2010-04-21 15:23:44 +01001602 def_bool y
David Rientjes6a108a12011-01-20 14:44:16 -08001603 prompt "x86 PAT support" if EXPERT
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001604 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001605 ---help---
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001606 Use PAT attributes to setup page level cache control.
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001607
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001608 PATs are the modern equivalents of MTRRs and are much more
1609 flexible than MTRRs.
1610
1611 Say N here if you see bootup problems (boot crash, boot hang,
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001612 spontaneous reboots) or a non-working video driver.
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001613
1614 If unsure, say Y.
1615
Venkatesh Pallipadi46cf98c2009-07-10 09:57:37 -07001616config ARCH_USES_PG_UNCACHED
1617 def_bool y
1618 depends on X86_PAT
1619
H. Peter Anvin628c6242011-07-31 13:59:29 -07001620config ARCH_RANDOM
1621 def_bool y
1622 prompt "x86 architectural random number generator" if EXPERT
1623 ---help---
1624 Enable the x86 architectural RDRAND instruction
1625 (Intel Bull Mountain technology) to generate random numbers.
1626 If supported, this is a high bandwidth, cryptographically
1627 secure hardware random number generator.
1628
H. Peter Anvin51ae4a22012-09-21 12:43:10 -07001629config X86_SMAP
1630 def_bool y
1631 prompt "Supervisor Mode Access Prevention" if EXPERT
1632 ---help---
1633 Supervisor Mode Access Prevention (SMAP) is a security
1634 feature in newer Intel processors. There is a small
1635 performance cost if this enabled and turned on; there is
1636 also a small increase in the kernel size if this is enabled.
1637
1638 If unsure, say Y.
1639
Dave Hansen72e9b5f2014-12-12 10:38:36 -08001640config X86_INTEL_MPX
1641 prompt "Intel MPX (Memory Protection Extensions)"
1642 def_bool n
1643 depends on CPU_SUP_INTEL
1644 ---help---
1645 MPX provides hardware features that can be used in
1646 conjunction with compiler-instrumented code to check
1647 memory references. It is designed to detect buffer
1648 overflow or underflow bugs.
1649
1650 This option enables running applications which are
1651 instrumented or otherwise use MPX. It does not use MPX
1652 itself inside the kernel or to protect the kernel
1653 against bad memory references.
1654
1655 Enabling this option will make the kernel larger:
1656 ~8k of kernel text and 36 bytes of data on a 64-bit
1657 defconfig. It adds a long to the 'mm_struct' which
1658 will increase the kernel memory overhead of each
1659 process and adds some branches to paths used during
1660 exec() and munmap().
1661
1662 For details, see Documentation/x86/intel_mpx.txt
1663
1664 If unsure, say N.
1665
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001666config EFI
Jan Beulich9ba16082008-10-15 22:01:38 -07001667 bool "EFI runtime service support"
Huang, Ying5b836832008-01-30 13:31:19 +01001668 depends on ACPI
Sergey Vlasovf6ce5002013-04-16 18:31:08 +04001669 select UCS2_STRING
Ard Biesheuvel022ee6c2014-06-26 12:09:05 +02001670 select EFI_RUNTIME_WRAPPERS
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001671 ---help---
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001672 This enables the kernel to use EFI runtime services that are
1673 available (such as the EFI variable services).
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001674
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001675 This option is only useful on systems that have EFI firmware.
1676 In addition, you should use the latest ELILO loader available
1677 at <http://elilo.sourceforge.net> in order to take advantage
1678 of EFI runtime services. However, even with this option, the
1679 resultant kernel should continue to boot on existing non-EFI
1680 platforms.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001681
Matt Fleming291f3632011-12-12 21:27:52 +00001682config EFI_STUB
1683 bool "EFI stub support"
Matt Flemingb16d8c22014-08-05 00:12:19 +01001684 depends on EFI && !X86_USE_3DNOW
Matt Fleming7b2a5832014-07-11 08:45:25 +01001685 select RELOCATABLE
Matt Fleming291f3632011-12-12 21:27:52 +00001686 ---help---
1687 This kernel feature allows a bzImage to be loaded directly
1688 by EFI firmware without the use of a bootloader.
1689
Roy Franz4172fe22013-09-22 15:45:25 -07001690 See Documentation/efi-stub.txt for more information.
Matt Fleming0c759662012-03-16 12:03:13 +00001691
Matt Fleming7d453ee2014-01-10 18:52:06 +00001692config EFI_MIXED
1693 bool "EFI mixed-mode support"
1694 depends on EFI_STUB && X86_64
1695 ---help---
1696 Enabling this feature allows a 64-bit kernel to be booted
1697 on a 32-bit firmware, provided that your CPU supports 64-bit
1698 mode.
1699
1700 Note that it is not possible to boot a mixed-mode enabled
1701 kernel via the EFI boot stub - a bootloader that supports
1702 the EFI handover protocol must be used.
1703
1704 If unsure, say N.
1705
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001706config SECCOMP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001707 def_bool y
1708 prompt "Enable seccomp to safely compute untrusted bytecode"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001709 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001710 This kernel feature is useful for number crunching applications
1711 that may need to compute untrusted bytecode during their
1712 execution. By using pipes or other transports made available to
1713 the process as file descriptors supporting the read/write
1714 syscalls, it's possible to isolate those applications in
1715 their own address space using seccomp. Once seccomp is
Alexey Dobriyan9c0bbee2008-09-09 11:01:31 +04001716 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001717 and the task is only allowed to execute a few safe syscalls
1718 defined by each seccomp mode.
1719
1720 If unsure, say Y. Only embedded should say N here.
1721
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001722source kernel/Kconfig.hz
1723
1724config KEXEC
1725 bool "kexec system call"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001726 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001727 kexec is a system call that implements the ability to shutdown your
1728 current kernel, and to start another kernel. It is like a reboot
1729 but it is independent of the system firmware. And like a reboot
1730 you can start any kernel with it, not just Linux.
1731
1732 The name comes from the similarity to the exec system call.
1733
1734 It is an ongoing process to be certain the hardware in a machine
1735 is properly shutdown, so do not be surprised if this code does not
Geert Uytterhoevenbf220692013-08-20 21:38:03 +02001736 initially work for you. As of this writing the exact hardware
1737 interface is strongly in flux, so no good recommendation can be
1738 made.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001739
Vivek Goyal74ca3172014-08-29 15:18:46 -07001740config KEXEC_FILE
1741 bool "kexec file based system call"
1742 select BUILD_BIN2C
1743 depends on KEXEC
1744 depends on X86_64
1745 depends on CRYPTO=y
1746 depends on CRYPTO_SHA256=y
1747 ---help---
1748 This is new version of kexec system call. This system call is
1749 file based and takes file descriptors as system call argument
1750 for kernel and initramfs as opposed to list of segments as
1751 accepted by previous system call.
1752
Vivek Goyal8e7d8382014-08-08 14:26:13 -07001753config KEXEC_VERIFY_SIG
1754 bool "Verify kernel signature during kexec_file_load() syscall"
Vivek Goyal74ca3172014-08-29 15:18:46 -07001755 depends on KEXEC_FILE
Vivek Goyal8e7d8382014-08-08 14:26:13 -07001756 ---help---
1757 This option makes kernel signature verification mandatory for
Borislav Petkovd8eb8942015-03-13 14:04:37 +01001758 the kexec_file_load() syscall.
Vivek Goyal8e7d8382014-08-08 14:26:13 -07001759
Borislav Petkovd8eb8942015-03-13 14:04:37 +01001760 In addition to that option, you need to enable signature
1761 verification for the corresponding kernel image type being
1762 loaded in order for this to work.
Vivek Goyal8e7d8382014-08-08 14:26:13 -07001763
1764config KEXEC_BZIMAGE_VERIFY_SIG
1765 bool "Enable bzImage signature verification support"
1766 depends on KEXEC_VERIFY_SIG
1767 depends on SIGNED_PE_FILE_VERIFICATION
1768 select SYSTEM_TRUSTED_KEYRING
1769 ---help---
1770 Enable bzImage signature verification support.
1771
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001772config CRASH_DUMP
Pavel Machek04b69442008-08-14 17:16:50 +02001773 bool "kernel crash dumps"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001774 depends on X86_64 || (X86_32 && HIGHMEM)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001775 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001776 Generate crash dump after being started by kexec.
1777 This should be normally only set in special crash dump kernels
1778 which are loaded in the main kernel with kexec-tools into
1779 a specially reserved region and then later executed after
1780 a crash by kdump/kexec. The crash dump kernel must be compiled
1781 to a memory address not used by the main kernel or BIOS using
1782 PHYSICAL_START, or it must be built as a relocatable image
1783 (CONFIG_RELOCATABLE=y).
1784 For more details see Documentation/kdump/kdump.txt
1785
Huang Ying3ab83522008-07-25 19:45:07 -07001786config KEXEC_JUMP
Kees Cook6ea30382012-10-02 11:16:47 -07001787 bool "kexec jump"
Huang Yingfee7b0d2009-03-10 10:57:16 +08001788 depends on KEXEC && HIBERNATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001789 ---help---
Huang Ying89081d12008-07-25 19:45:10 -07001790 Jump between original kernel and kexeced kernel and invoke
1791 code in physical address mode via KEXEC
Huang Ying3ab83522008-07-25 19:45:07 -07001792
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001793config PHYSICAL_START
David Rientjes6a108a12011-01-20 14:44:16 -08001794 hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP)
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001795 default "0x1000000"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001796 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001797 This gives the physical address where the kernel is loaded.
1798
1799 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
1800 bzImage will decompress itself to above physical address and
1801 run from there. Otherwise, bzImage will run from the address where
1802 it has been loaded by the boot loader and will ignore above physical
1803 address.
1804
1805 In normal kdump cases one does not have to set/change this option
1806 as now bzImage can be compiled as a completely relocatable image
1807 (CONFIG_RELOCATABLE=y) and be used to load and run from a different
1808 address. This option is mainly useful for the folks who don't want
1809 to use a bzImage for capturing the crash dump and want to use a
1810 vmlinux instead. vmlinux is not relocatable hence a kernel needs
1811 to be specifically compiled to run from a specific memory area
1812 (normally a reserved region) and this option comes handy.
1813
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001814 So if you are using bzImage for capturing the crash dump,
1815 leave the value here unchanged to 0x1000000 and set
1816 CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux
1817 for capturing the crash dump change this value to start of
1818 the reserved region. In other words, it can be set based on
1819 the "X" value as specified in the "crashkernel=YM@XM"
1820 command line boot parameter passed to the panic-ed
1821 kernel. Please take a look at Documentation/kdump/kdump.txt
1822 for more details about crash dumps.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001823
1824 Usage of bzImage for capturing the crash dump is recommended as
1825 one does not have to build two kernels. Same kernel can be used
1826 as production kernel and capture kernel. Above option should have
1827 gone away after relocatable bzImage support is introduced. But it
1828 is present because there are users out there who continue to use
1829 vmlinux for dump capture. This option should go away down the
1830 line.
1831
1832 Don't change this unless you know what you are doing.
1833
1834config RELOCATABLE
H. Peter Anvin26717802009-05-07 14:19:34 -07001835 bool "Build a relocatable kernel"
1836 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001837 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001838 This builds a kernel image that retains relocation information
1839 so it can be loaded someplace besides the default 1MB.
1840 The relocations tend to make the kernel binary about 10% larger,
1841 but are discarded at runtime.
1842
1843 One use is for the kexec on panic case where the recovery kernel
1844 must live at a different physical address than the primary
1845 kernel.
1846
1847 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
1848 it has been loaded at and the compile time physical address
Kees Cook8ab38202013-10-10 17:18:14 -07001849 (CONFIG_PHYSICAL_START) is used as the minimum location.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001850
Kees Cook8ab38202013-10-10 17:18:14 -07001851config RANDOMIZE_BASE
1852 bool "Randomize the address of the kernel image"
1853 depends on RELOCATABLE
Kees Cook8ab38202013-10-10 17:18:14 -07001854 default n
1855 ---help---
1856 Randomizes the physical and virtual address at which the
1857 kernel image is decompressed, as a security feature that
1858 deters exploit attempts relying on knowledge of the location
1859 of kernel internals.
1860
Kees Cooka653f352013-11-11 14:28:39 -08001861 Entropy is generated using the RDRAND instruction if it is
1862 supported. If RDTSC is supported, it is used as well. If
1863 neither RDRAND nor RDTSC are supported, then randomness is
1864 read from the i8254 timer.
Kees Cook8ab38202013-10-10 17:18:14 -07001865
1866 The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET,
Kees Cooka653f352013-11-11 14:28:39 -08001867 and aligned according to PHYSICAL_ALIGN. Since the kernel is
1868 built using 2GiB addressing, and PHYSICAL_ALGIN must be at a
1869 minimum of 2MiB, only 10 bits of entropy is theoretically
1870 possible. At best, due to page table layouts, 64-bit can use
1871 9 bits of entropy and 32-bit uses 8 bits.
Kees Cook8ab38202013-10-10 17:18:14 -07001872
Kees Cookda2b6fb2013-12-10 12:27:45 -08001873 If unsure, say N.
1874
Kees Cook8ab38202013-10-10 17:18:14 -07001875config RANDOMIZE_BASE_MAX_OFFSET
Kees Cookda2b6fb2013-12-10 12:27:45 -08001876 hex "Maximum kASLR offset allowed" if EXPERT
Kees Cook8ab38202013-10-10 17:18:14 -07001877 depends on RANDOMIZE_BASE
Kees Cook6145cfe2013-10-10 17:18:18 -07001878 range 0x0 0x20000000 if X86_32
1879 default "0x20000000" if X86_32
1880 range 0x0 0x40000000 if X86_64
1881 default "0x40000000" if X86_64
Kees Cook8ab38202013-10-10 17:18:14 -07001882 ---help---
Kees Cookda2b6fb2013-12-10 12:27:45 -08001883 The lesser of RANDOMIZE_BASE_MAX_OFFSET and available physical
1884 memory is used to determine the maximal offset in bytes that will
1885 be applied to the kernel when kernel Address Space Layout
1886 Randomization (kASLR) is active. This must be a multiple of
1887 PHYSICAL_ALIGN.
Kees Cook6145cfe2013-10-10 17:18:18 -07001888
Kees Cookda2b6fb2013-12-10 12:27:45 -08001889 On 32-bit this is limited to 512MiB by page table layouts. The
1890 default is 512MiB.
Kees Cook6145cfe2013-10-10 17:18:18 -07001891
Kees Cookda2b6fb2013-12-10 12:27:45 -08001892 On 64-bit this is limited by how the kernel fixmap page table is
1893 positioned, so this cannot be larger than 1GiB currently. Without
1894 RANDOMIZE_BASE, there is a 512MiB to 1.5GiB split between kernel
1895 and modules. When RANDOMIZE_BASE_MAX_OFFSET is above 512MiB, the
1896 modules area will shrink to compensate, up to the current maximum
1897 1GiB to 1GiB split. The default is 1GiB.
1898
1899 If unsure, leave at the default value.
Kees Cook8ab38202013-10-10 17:18:14 -07001900
1901# Relocation on x86 needs some additional build support
H. Peter Anvin845adf72009-05-05 21:20:51 -07001902config X86_NEED_RELOCS
1903 def_bool y
Kees Cook8ab38202013-10-10 17:18:14 -07001904 depends on RANDOMIZE_BASE || (X86_32 && RELOCATABLE)
H. Peter Anvin845adf72009-05-05 21:20:51 -07001905
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001906config PHYSICAL_ALIGN
Kees Cooka0215062013-07-08 09:15:17 -07001907 hex "Alignment value to which kernel should be aligned"
Kees Cook8ab38202013-10-10 17:18:14 -07001908 default "0x200000"
Kees Cooka0215062013-07-08 09:15:17 -07001909 range 0x2000 0x1000000 if X86_32
1910 range 0x200000 0x1000000 if X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001911 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001912 This value puts the alignment restrictions on physical address
1913 where kernel is loaded and run from. Kernel is compiled for an
1914 address which meets above alignment restriction.
1915
1916 If bootloader loads the kernel at a non-aligned address and
1917 CONFIG_RELOCATABLE is set, kernel will move itself to nearest
1918 address aligned to above value and run from there.
1919
1920 If bootloader loads the kernel at a non-aligned address and
1921 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
1922 load address and decompress itself to the address it has been
1923 compiled for and run from there. The address for which kernel is
1924 compiled already meets above alignment restrictions. Hence the
1925 end result is that kernel runs from a physical address meeting
1926 above alignment restrictions.
1927
Kees Cooka0215062013-07-08 09:15:17 -07001928 On 32-bit this value must be a multiple of 0x2000. On 64-bit
1929 this value must be a multiple of 0x200000.
1930
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001931 Don't change this unless you know what you are doing.
1932
1933config HOTPLUG_CPU
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001934 bool "Support for hot-pluggable CPUs"
Stephen Rothwell40b31362013-05-21 13:49:35 +10001935 depends on SMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001936 ---help---
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001937 Say Y here to allow turning CPUs off and on. CPUs can be
1938 controlled through /sys/devices/system/cpu.
1939 ( Note: power management support will enable this option
1940 automatically on SMP systems. )
1941 Say N if you want to disable CPU hotplug.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001942
Fenghua Yu80aa1df2012-11-13 11:32:39 -08001943config BOOTPARAM_HOTPLUG_CPU0
1944 bool "Set default setting of cpu0_hotpluggable"
1945 default n
Kees Cook2c922cd2013-01-22 13:01:19 -08001946 depends on HOTPLUG_CPU
Fenghua Yu80aa1df2012-11-13 11:32:39 -08001947 ---help---
1948 Set whether default state of cpu0_hotpluggable is on or off.
1949
1950 Say Y here to enable CPU0 hotplug by default. If this switch
1951 is turned on, there is no need to give cpu0_hotplug kernel
1952 parameter and the CPU0 hotplug feature is enabled by default.
1953
1954 Please note: there are two known CPU0 dependencies if you want
1955 to enable the CPU0 hotplug feature either by this switch or by
1956 cpu0_hotplug kernel parameter.
1957
1958 First, resume from hibernate or suspend always starts from CPU0.
1959 So hibernate and suspend are prevented if CPU0 is offline.
1960
1961 Second dependency is PIC interrupts always go to CPU0. CPU0 can not
1962 offline if any interrupt can not migrate out of CPU0. There may
1963 be other CPU0 dependencies.
1964
1965 Please make sure the dependencies are under your control before
1966 you enable this feature.
1967
1968 Say N if you don't want to enable CPU0 hotplug feature by default.
1969 You still can enable the CPU0 hotplug feature at boot by kernel
1970 parameter cpu0_hotplug.
1971
Fenghua Yua71c8bc2012-11-13 11:32:51 -08001972config DEBUG_HOTPLUG_CPU0
1973 def_bool n
1974 prompt "Debug CPU0 hotplug"
Kees Cook2c922cd2013-01-22 13:01:19 -08001975 depends on HOTPLUG_CPU
Fenghua Yua71c8bc2012-11-13 11:32:51 -08001976 ---help---
1977 Enabling this option offlines CPU0 (if CPU0 can be offlined) as
1978 soon as possible and boots up userspace with CPU0 offlined. User
1979 can online CPU0 back after boot time.
1980
1981 To debug CPU0 hotplug, you need to enable CPU0 offline/online
1982 feature by either turning on CONFIG_BOOTPARAM_HOTPLUG_CPU0 during
1983 compilation or giving cpu0_hotplug kernel parameter at boot.
1984
1985 If unsure, say N.
1986
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001987config COMPAT_VDSO
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07001988 def_bool n
1989 prompt "Disable the 32-bit vDSO (needed for glibc 2.3.3)"
Roland McGrathaf65d642008-01-30 13:30:43 +01001990 depends on X86_32 || IA32_EMULATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001991 ---help---
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07001992 Certain buggy versions of glibc will crash if they are
1993 presented with a 32-bit vDSO that is not mapped at the address
1994 indicated in its segment table.
Randy Dunlape84446d2009-11-10 15:46:52 -08001995
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07001996 The bug was introduced by f866314b89d56845f55e6f365e18b31ec978ec3a
1997 and fixed by 3b3ddb4f7db98ec9e912ccdf54d35df4aa30e04a and
1998 49ad572a70b8aeb91e57483a11dd1b77e31c4468. Glibc 2.3.3 is
1999 the only released version with the bug, but OpenSUSE 9
2000 contains a buggy "glibc 2.3.2".
Sam Ravnborg506f1d02007-11-09 21:56:54 +01002001
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07002002 The symptom of the bug is that everything crashes on startup, saying:
2003 dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed!
2004
2005 Saying Y here changes the default value of the vdso32 boot
2006 option from 1 to 0, which turns off the 32-bit vDSO entirely.
2007 This works around the glibc bug but hurts performance.
2008
2009 If unsure, say N: if you are compiling your own kernel, you
2010 are unlikely to be using a buggy version of glibc.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01002011
Tim Bird516cbf32008-08-12 12:52:36 -07002012config CMDLINE_BOOL
2013 bool "Built-in kernel command line"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002014 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07002015 Allow for specifying boot arguments to the kernel at
2016 build time. On some systems (e.g. embedded ones), it is
2017 necessary or convenient to provide some or all of the
2018 kernel boot arguments with the kernel itself (that is,
2019 to not rely on the boot loader to provide them.)
2020
2021 To compile command line arguments into the kernel,
2022 set this option to 'Y', then fill in the
Sébastien Hinderer69711ca2015-07-08 00:02:01 +02002023 boot arguments in CONFIG_CMDLINE.
Tim Bird516cbf32008-08-12 12:52:36 -07002024
2025 Systems with fully functional boot loaders (i.e. non-embedded)
2026 should leave this option set to 'N'.
2027
2028config CMDLINE
2029 string "Built-in kernel command string"
2030 depends on CMDLINE_BOOL
2031 default ""
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002032 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07002033 Enter arguments here that should be compiled into the kernel
2034 image and used at boot time. If the boot loader provides a
2035 command line at boot time, it is appended to this string to
2036 form the full kernel command line, when the system boots.
2037
2038 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
2039 change this behavior.
2040
2041 In most cases, the command line (whether built-in or provided
2042 by the boot loader) should specify the device for the root
2043 file system.
2044
2045config CMDLINE_OVERRIDE
2046 bool "Built-in command line overrides boot loader arguments"
Tim Bird516cbf32008-08-12 12:52:36 -07002047 depends on CMDLINE_BOOL
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002048 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07002049 Set this option to 'Y' to have the kernel ignore the boot loader
2050 command line, and use ONLY the built-in command line.
2051
2052 This is used to work around broken boot loaders. This should
2053 be set to 'N' under normal conditions.
2054
Seth Jenningsb700e7f2014-12-16 11:58:19 -06002055source "kernel/livepatch/Kconfig"
2056
Sam Ravnborg506f1d02007-11-09 21:56:54 +01002057endmenu
2058
2059config ARCH_ENABLE_MEMORY_HOTPLUG
2060 def_bool y
2061 depends on X86_64 || (X86_32 && HIGHMEM)
2062
Gary Hade35551052008-10-31 10:52:03 -07002063config ARCH_ENABLE_MEMORY_HOTREMOVE
2064 def_bool y
2065 depends on MEMORY_HOTPLUG
2066
Lee Schermerhorne534c7c2010-05-26 14:44:58 -07002067config USE_PERCPU_NUMA_NODE_ID
Tejun Heo645a7912011-01-23 14:37:40 +01002068 def_bool y
Lee Schermerhorne534c7c2010-05-26 14:44:58 -07002069 depends on NUMA
2070
Kirill A. Shutemov94918462013-11-14 14:31:10 -08002071config ARCH_ENABLE_SPLIT_PMD_PTLOCK
2072 def_bool y
2073 depends on X86_64 || X86_PAE
2074
Naoya Horiguchic177c812014-06-04 16:05:35 -07002075config ARCH_ENABLE_HUGEPAGE_MIGRATION
2076 def_bool y
2077 depends on X86_64 && HUGETLB_PAGE && MIGRATION
2078
Bjorn Helgaasda85f862008-11-05 13:37:27 -06002079menu "Power management and ACPI options"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002080
2081config ARCH_HIBERNATION_HEADER
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002082 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002083 depends on X86_64 && HIBERNATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002084
2085source "kernel/power/Kconfig"
2086
2087source "drivers/acpi/Kconfig"
2088
Feng Tangefafc8b2009-08-14 15:23:29 -04002089source "drivers/sfi/Kconfig"
2090
Andi Kleena6b68072008-01-30 13:32:49 +01002091config X86_APM_BOOT
Jan Beulich6fc108a2010-04-21 15:23:44 +01002092 def_bool y
Paul Bolle282e5aa2011-11-17 11:41:31 +01002093 depends on APM
Andi Kleena6b68072008-01-30 13:32:49 +01002094
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002095menuconfig APM
2096 tristate "APM (Advanced Power Management) BIOS support"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02002097 depends on X86_32 && PM_SLEEP
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002098 ---help---
2099 APM is a BIOS specification for saving power using several different
2100 techniques. This is mostly useful for battery powered laptops with
2101 APM compliant BIOSes. If you say Y here, the system time will be
2102 reset after a RESUME operation, the /proc/apm device will provide
2103 battery status information, and user-space programs will receive
2104 notification of APM "events" (e.g. battery status change).
2105
2106 If you select "Y" here, you can disable actual use of the APM
2107 BIOS by passing the "apm=off" option to the kernel at boot time.
2108
2109 Note that the APM support is almost completely disabled for
2110 machines with more than one CPU.
2111
2112 In order to use APM, you will need supporting software. For location
Michael Witten2dc98fd2011-07-08 21:11:16 +00002113 and more information, read <file:Documentation/power/apm-acpi.txt>
2114 and the Battery Powered Linux mini-HOWTO, available from
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002115 <http://www.tldp.org/docs.html#howto>.
2116
2117 This driver does not spin down disk drives (see the hdparm(8)
2118 manpage ("man 8 hdparm") for that), and it doesn't turn off
2119 VESA-compliant "green" monitors.
2120
2121 This driver does not support the TI 4000M TravelMate and the ACER
2122 486/DX4/75 because they don't have compliant BIOSes. Many "green"
2123 desktop machines also don't have compliant BIOSes, and this driver
2124 may cause those machines to panic during the boot phase.
2125
2126 Generally, if you don't have a battery in your machine, there isn't
2127 much point in using this driver and you should say N. If you get
2128 random kernel OOPSes or reboots that don't seem to be related to
2129 anything, try disabling/enabling this option (or disabling/enabling
2130 APM in your BIOS).
2131
2132 Some other things you should try when experiencing seemingly random,
2133 "weird" problems:
2134
2135 1) make sure that you have enough swap space and that it is
2136 enabled.
2137 2) pass the "no-hlt" option to the kernel
2138 3) switch on floating point emulation in the kernel and pass
2139 the "no387" option to the kernel
2140 4) pass the "floppy=nodma" option to the kernel
2141 5) pass the "mem=4M" option to the kernel (thereby disabling
2142 all but the first 4 MB of RAM)
2143 6) make sure that the CPU is not over clocked.
2144 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
2145 8) disable the cache from your BIOS settings
2146 9) install a fan for the video card or exchange video RAM
2147 10) install a better fan for the CPU
2148 11) exchange RAM chips
2149 12) exchange the motherboard.
2150
2151 To compile this driver as a module, choose M here: the
2152 module will be called apm.
2153
2154if APM
2155
2156config APM_IGNORE_USER_SUSPEND
2157 bool "Ignore USER SUSPEND"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002158 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002159 This option will ignore USER SUSPEND requests. On machines with a
2160 compliant APM BIOS, you want to say N. However, on the NEC Versa M
2161 series notebooks, it is necessary to say Y because of a BIOS bug.
2162
2163config APM_DO_ENABLE
2164 bool "Enable PM at boot time"
2165 ---help---
2166 Enable APM features at boot time. From page 36 of the APM BIOS
2167 specification: "When disabled, the APM BIOS does not automatically
2168 power manage devices, enter the Standby State, enter the Suspend
2169 State, or take power saving steps in response to CPU Idle calls."
2170 This driver will make CPU Idle calls when Linux is idle (unless this
2171 feature is turned off -- see "Do CPU IDLE calls", below). This
2172 should always save battery power, but more complicated APM features
2173 will be dependent on your BIOS implementation. You may need to turn
2174 this option off if your computer hangs at boot time when using APM
2175 support, or if it beeps continuously instead of suspending. Turn
2176 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
2177 T400CDT. This is off by default since most machines do fine without
2178 this feature.
2179
2180config APM_CPU_IDLE
Len Browndd8af072013-02-09 21:10:04 -05002181 depends on CPU_IDLE
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002182 bool "Make CPU Idle calls when idle"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002183 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002184 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
2185 On some machines, this can activate improved power savings, such as
2186 a slowed CPU clock rate, when the machine is idle. These idle calls
2187 are made after the idle loop has run for some length of time (e.g.,
2188 333 mS). On some machines, this will cause a hang at boot time or
2189 whenever the CPU becomes idle. (On machines with more than one CPU,
2190 this option does nothing.)
2191
2192config APM_DISPLAY_BLANK
2193 bool "Enable console blanking using APM"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002194 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002195 Enable console blanking using the APM. Some laptops can use this to
2196 turn off the LCD backlight when the screen blanker of the Linux
2197 virtual console blanks the screen. Note that this is only used by
2198 the virtual console screen blanker, and won't turn off the backlight
2199 when using the X Window system. This also doesn't have anything to
2200 do with your VESA-compliant power-saving monitor. Further, this
2201 option doesn't work for all laptops -- it might not turn off your
2202 backlight at all, or it might print a lot of errors to the console,
2203 especially if you are using gpm.
2204
2205config APM_ALLOW_INTS
2206 bool "Allow interrupts during APM BIOS calls"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002207 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002208 Normally we disable external interrupts while we are making calls to
2209 the APM BIOS as a measure to lessen the effects of a badly behaving
2210 BIOS implementation. The BIOS should reenable interrupts if it
2211 needs to. Unfortunately, some BIOSes do not -- especially those in
2212 many of the newer IBM Thinkpads. If you experience hangs when you
2213 suspend, try setting this to Y. Otherwise, say N.
2214
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002215endif # APM
2216
Dave Jonesbb0a56e2011-05-19 18:51:07 -04002217source "drivers/cpufreq/Kconfig"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002218
2219source "drivers/cpuidle/Kconfig"
2220
Andy Henroid27471fd2008-10-09 11:45:22 -07002221source "drivers/idle/Kconfig"
2222
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002223endmenu
2224
2225
2226menu "Bus options (PCI etc.)"
2227
2228config PCI
Ingo Molnar1ac97012008-05-19 14:10:14 +02002229 bool "PCI support"
Adrian Bunk1c858082008-01-30 13:32:32 +01002230 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002231 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002232 Find out whether you have a PCI motherboard. PCI is the name of a
2233 bus system, i.e. the way the CPU talks to the other stuff inside
2234 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
2235 VESA. If you have PCI, say Y, otherwise N.
2236
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002237choice
2238 prompt "PCI access mode"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02002239 depends on X86_32 && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002240 default PCI_GOANY
2241 ---help---
2242 On PCI systems, the BIOS can be used to detect the PCI devices and
2243 determine their configuration. However, some old PCI motherboards
2244 have BIOS bugs and may crash if this is done. Also, some embedded
2245 PCI-based systems don't have any BIOS at all. Linux can also try to
2246 detect the PCI hardware directly without using the BIOS.
2247
2248 With this option, you can specify how Linux should detect the
2249 PCI devices. If you choose "BIOS", the BIOS will be used,
2250 if you choose "Direct", the BIOS won't be used, and if you
2251 choose "MMConfig", then PCI Express MMCONFIG will be used.
2252 If you choose "Any", the kernel will try MMCONFIG, then the
2253 direct access method and falls back to the BIOS if that doesn't
2254 work. If unsure, go with the default, which is "Any".
2255
2256config PCI_GOBIOS
2257 bool "BIOS"
2258
2259config PCI_GOMMCONFIG
2260 bool "MMConfig"
2261
2262config PCI_GODIRECT
2263 bool "Direct"
2264
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002265config PCI_GOOLPC
Daniel Drake76fb6572010-09-23 17:28:04 +01002266 bool "OLPC XO-1"
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002267 depends on OLPC
2268
Andres Salomon2bdd1b02008-06-05 14:14:41 -07002269config PCI_GOANY
2270 bool "Any"
2271
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002272endchoice
2273
2274config PCI_BIOS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002275 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02002276 depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002277
2278# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
2279config PCI_DIRECT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002280 def_bool y
Shaohua Li0aba4962011-05-27 14:59:39 +08002281 depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC || PCI_GOMMCONFIG))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002282
2283config PCI_MMCONFIG
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002284 def_bool y
Feng Tang5f0db7a2009-08-14 15:37:50 -04002285 depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002286
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002287config PCI_OLPC
Andres Salomon2bdd1b02008-06-05 14:14:41 -07002288 def_bool y
2289 depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002290
Alex Nixonb5401a92010-03-18 16:31:34 -04002291config PCI_XEN
2292 def_bool y
2293 depends on PCI && XEN
2294 select SWIOTLB_XEN
2295
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002296config PCI_DOMAINS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002297 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002298 depends on PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002299
2300config PCI_MMCONFIG
2301 bool "Support mmconfig PCI config space access"
2302 depends on X86_64 && PCI && ACPI
2303
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07002304config PCI_CNB20LE_QUIRK
David Rientjes6a108a12011-01-20 14:44:16 -08002305 bool "Read CNB20LE Host Bridge Windows" if EXPERT
Kees Cook6ea30382012-10-02 11:16:47 -07002306 depends on PCI
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07002307 help
2308 Read the PCI windows out of the CNB20LE host bridge. This allows
2309 PCI hotplug to work on systems with the CNB20LE chipset which do
2310 not have ACPI.
2311
Bjorn Helgaas64a5fed2011-01-06 10:12:30 -07002312 There's no public spec for this chipset, and this functionality
2313 is known to be incomplete.
2314
2315 You should say N unless you know you need this.
2316
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002317source "drivers/pci/pcie/Kconfig"
2318
2319source "drivers/pci/Kconfig"
2320
David Rientjes1c00f012011-03-22 16:34:59 -07002321# x86_64 have no ISA slots, but can have ISA-style DMA.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002322config ISA_DMA_API
David Rientjes1c00f012011-03-22 16:34:59 -07002323 bool "ISA-style DMA support" if (X86_64 && EXPERT)
2324 default y
2325 help
2326 Enables ISA-style DMA support for devices requiring such controllers.
2327 If unsure, say Y.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002328
2329if X86_32
2330
2331config ISA
2332 bool "ISA support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002333 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002334 Find out whether you have ISA slots on your motherboard. ISA is the
2335 name of a bus system, i.e. the way the CPU talks to the other stuff
2336 inside your box. Other bus systems are PCI, EISA, MicroChannel
2337 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
2338 newer boards don't support it. If you have ISA, say Y, otherwise N.
2339
2340config EISA
2341 bool "EISA support"
2342 depends on ISA
2343 ---help---
2344 The Extended Industry Standard Architecture (EISA) bus was
2345 developed as an open alternative to the IBM MicroChannel bus.
2346
2347 The EISA bus provided some of the features of the IBM MicroChannel
2348 bus while maintaining backward compatibility with cards made for
2349 the older ISA bus. The EISA bus saw limited use between 1988 and
2350 1995 when it was made obsolete by the PCI bus.
2351
2352 Say Y here if you are building a kernel for an EISA-based machine.
2353
2354 Otherwise, say N.
2355
2356source "drivers/eisa/Kconfig"
2357
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002358config SCx200
2359 tristate "NatSemi SCx200 support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002360 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002361 This provides basic support for National Semiconductor's
2362 (now AMD's) Geode processors. The driver probes for the
2363 PCI-IDs of several on-chip devices, so its a good dependency
2364 for other scx200_* drivers.
2365
2366 If compiled as a module, the driver is named scx200.
2367
2368config SCx200HR_TIMER
2369 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
John Stultz592913e2010-07-13 17:56:20 -07002370 depends on SCx200
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002371 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002372 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002373 This driver provides a clocksource built upon the on-chip
2374 27MHz high-resolution timer. Its also a workaround for
2375 NSC Geode SC-1100's buggy TSC, which loses time when the
2376 processor goes idle (as is done by the scheduler). The
2377 other workaround is idle=poll boot option.
2378
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002379config OLPC
2380 bool "One Laptop Per Child support"
Thomas Gleixner54008972011-02-23 09:50:15 +01002381 depends on !X86_PAE
Andres Salomon3c554942009-12-14 18:00:36 -08002382 select GPIOLIB
Thomas Gleixnerdc3119e72011-02-23 10:08:31 +01002383 select OF
Daniel Drake45bb1672011-03-13 15:10:17 +00002384 select OF_PROMTREE
Grant Likelyb4e51852011-12-16 15:50:17 -07002385 select IRQ_DOMAIN
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002386 ---help---
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002387 Add support for detecting the unique features of the OLPC
2388 XO hardware.
2389
Daniel Drakea3128582011-06-25 17:34:10 +01002390config OLPC_XO1_PM
2391 bool "OLPC XO-1 Power Management"
Daniel Drake97c4cb72011-06-25 17:34:11 +01002392 depends on OLPC && MFD_CS5535 && PM_SLEEP
Daniel Drakea3128582011-06-25 17:34:10 +01002393 select MFD_CORE
Daniel Drakebf1ebf02010-10-10 10:40:32 +01002394 ---help---
Daniel Drake97c4cb72011-06-25 17:34:11 +01002395 Add support for poweroff and suspend of the OLPC XO-1 laptop.
Daniel Drakebf1ebf02010-10-10 10:40:32 +01002396
Daniel Drakecfee9592011-06-25 17:34:17 +01002397config OLPC_XO1_RTC
2398 bool "OLPC XO-1 Real Time Clock"
2399 depends on OLPC_XO1_PM && RTC_DRV_CMOS
2400 ---help---
2401 Add support for the XO-1 real time clock, which can be used as a
2402 programmable wakeup source.
2403
Daniel Drake7feda8e2011-06-25 17:34:12 +01002404config OLPC_XO1_SCI
2405 bool "OLPC XO-1 SCI extras"
Daniel Draked8d01a62011-07-24 18:33:21 +01002406 depends on OLPC && OLPC_XO1_PM
Randy Dunlaped8e47f2012-12-18 12:22:17 -08002407 depends on INPUT=y
Daniel Draked8d01a62011-07-24 18:33:21 +01002408 select POWER_SUPPLY
Daniel Drake7feda8e2011-06-25 17:34:12 +01002409 select GPIO_CS5535
2410 select MFD_CORE
2411 ---help---
2412 Add support for SCI-based features of the OLPC XO-1 laptop:
Daniel Drake7bc74b32011-06-25 17:34:14 +01002413 - EC-driven system wakeups
Daniel Drake7feda8e2011-06-25 17:34:12 +01002414 - Power button
Daniel Drake7bc74b32011-06-25 17:34:14 +01002415 - Ebook switch
Daniel Drake2cf2bae2011-06-25 17:34:15 +01002416 - Lid switch
Daniel Drakee1040ac2011-06-25 17:34:16 +01002417 - AC adapter status updates
2418 - Battery status updates
Daniel Drake7feda8e2011-06-25 17:34:12 +01002419
Daniel Drakea0f30f52011-06-25 17:34:18 +01002420config OLPC_XO15_SCI
2421 bool "OLPC XO-1.5 SCI extras"
Daniel Draked8d01a62011-07-24 18:33:21 +01002422 depends on OLPC && ACPI
2423 select POWER_SUPPLY
Daniel Drakea0f30f52011-06-25 17:34:18 +01002424 ---help---
2425 Add support for SCI-based features of the OLPC XO-1.5 laptop:
2426 - EC-driven system wakeups
2427 - AC adapter status updates
2428 - Battery status updates
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002429
Ed Wildgoosed4f3e352011-09-20 14:00:12 -07002430config ALIX
2431 bool "PCEngines ALIX System Support (LED setup)"
2432 select GPIOLIB
2433 ---help---
2434 This option enables system support for the PCEngines ALIX.
2435 At present this just sets up LEDs for GPIO control on
2436 ALIX2/3/6 boards. However, other system specific setup should
2437 get added here.
2438
2439 Note: You must still enable the drivers for GPIO and LED support
2440 (GPIO_CS5535 & LEDS_GPIO) to actually use the LEDs
2441
2442 Note: You have to set alix.force=1 for boards with Award BIOS.
2443
Philip Prindevilleda4e3302012-03-05 15:05:15 -08002444config NET5501
2445 bool "Soekris Engineering net5501 System Support (LEDS, GPIO, etc)"
2446 select GPIOLIB
2447 ---help---
2448 This option enables system support for the Soekris Engineering net5501.
2449
Philip A. Prindeville31970592012-01-14 01:45:39 -07002450config GEOS
2451 bool "Traverse Technologies GEOS System Support (LEDS, GPIO, etc)"
2452 select GPIOLIB
2453 depends on DMI
2454 ---help---
2455 This option enables system support for the Traverse Technologies GEOS.
2456
Vivien Didelot7d029122013-01-04 16:18:14 -05002457config TS5500
2458 bool "Technologic Systems TS-5500 platform support"
2459 depends on MELAN
2460 select CHECK_SIGNATURE
2461 select NEW_LEDS
2462 select LEDS_CLASS
2463 ---help---
2464 This option enables system support for the Technologic Systems TS-5500.
2465
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002466endif # X86_32
2467
Andreas Herrmann23ac4ae2010-09-17 18:03:43 +02002468config AMD_NB
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002469 def_bool y
Borislav Petkov0e152cd2010-03-12 15:43:03 +01002470 depends on CPU_SUP_AMD && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002471
2472source "drivers/pcmcia/Kconfig"
2473
2474source "drivers/pci/hotplug/Kconfig"
2475
Alexandre Bounine388b78a2011-03-23 16:43:03 -07002476config RAPIDIO
Alexandre Bouninefdf90ab2013-07-03 15:08:56 -07002477 tristate "RapidIO support"
Alexandre Bounine388b78a2011-03-23 16:43:03 -07002478 depends on PCI
2479 default n
2480 help
Alexandre Bouninefdf90ab2013-07-03 15:08:56 -07002481 If enabled this option will include drivers and the core
Alexandre Bounine388b78a2011-03-23 16:43:03 -07002482 infrastructure code to support RapidIO interconnect devices.
2483
2484source "drivers/rapidio/Kconfig"
2485
David Herrmanne3263ab2013-08-02 14:05:22 +02002486config X86_SYSFB
2487 bool "Mark VGA/VBE/EFI FB as generic system framebuffer"
2488 help
2489 Firmwares often provide initial graphics framebuffers so the BIOS,
2490 bootloader or kernel can show basic video-output during boot for
2491 user-guidance and debugging. Historically, x86 used the VESA BIOS
2492 Extensions and EFI-framebuffers for this, which are mostly limited
2493 to x86.
2494 This option, if enabled, marks VGA/VBE/EFI framebuffers as generic
2495 framebuffers so the new generic system-framebuffer drivers can be
2496 used on x86. If the framebuffer is not compatible with the generic
2497 modes, it is adverticed as fallback platform framebuffer so legacy
2498 drivers like efifb, vesafb and uvesafb can pick it up.
2499 If this option is not selected, all system framebuffers are always
2500 marked as fallback platform framebuffers as usual.
2501
2502 Note: Legacy fbdev drivers, including vesafb, efifb, uvesafb, will
2503 not be able to pick up generic system framebuffers if this option
2504 is selected. You are highly encouraged to enable simplefb as
2505 replacement if you select this option. simplefb can correctly deal
2506 with generic system framebuffers. But you should still keep vesafb
2507 and others enabled as fallback if a system framebuffer is
2508 incompatible with simplefb.
2509
2510 If unsure, say Y.
2511
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002512endmenu
2513
2514
2515menu "Executable file formats / Emulations"
2516
2517source "fs/Kconfig.binfmt"
2518
2519config IA32_EMULATION
2520 bool "IA32 Emulation"
2521 depends on X86_64
Randy Dunlapd1603992013-06-18 12:33:40 -07002522 select BINFMT_ELF
Roland McGratha97f52e2008-01-30 13:31:55 +01002523 select COMPAT_BINFMT_ELF
Catalin Marinasaf1839e2012-10-08 16:28:08 -07002524 select HAVE_UID16
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002525 ---help---
H. J. Lu5fd92e62012-02-19 10:40:03 -08002526 Include code to run legacy 32-bit programs under a
2527 64-bit kernel. You should likely turn this on, unless you're
2528 100% sure that you don't have any 32-bit programs left.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002529
2530config IA32_AOUT
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002531 tristate "IA32 a.out support"
2532 depends on IA32_EMULATION
2533 ---help---
2534 Support old a.out binaries in the 32bit emulation.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002535
H. Peter Anvin0bf62762012-02-27 14:09:10 -08002536config X86_X32
Kees Cook6ea30382012-10-02 11:16:47 -07002537 bool "x32 ABI for 64-bit mode"
2538 depends on X86_64 && IA32_EMULATION
H. J. Lu5fd92e62012-02-19 10:40:03 -08002539 ---help---
2540 Include code to run binaries for the x32 native 32-bit ABI
2541 for 64-bit processors. An x32 process gets access to the
2542 full 64-bit register file and wide data path while leaving
2543 pointers at 32 bits for smaller memory footprint.
2544
2545 You will need a recent binutils (2.22 or later) with
2546 elf32_x86_64 support enabled to compile a kernel with this
2547 option set.
2548
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002549config COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002550 def_bool y
H. Peter Anvin0bf62762012-02-27 14:09:10 -08002551 depends on IA32_EMULATION || X86_X32
Chris Metcalf48b25c42012-03-15 13:13:38 -04002552 select ARCH_WANT_OLD_COMPAT_IPC
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002553
Jan Beulich3120e252012-09-10 12:41:45 +01002554if COMPAT
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002555config COMPAT_FOR_U64_ALIGNMENT
Jan Beulich3120e252012-09-10 12:41:45 +01002556 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002557
2558config SYSVIPC_COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002559 def_bool y
Jan Beulich3120e252012-09-10 12:41:45 +01002560 depends on SYSVIPC
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002561
David Howellsee009e4a02011-03-07 15:06:20 +00002562config KEYS_COMPAT
Jan Beulich3120e252012-09-10 12:41:45 +01002563 def_bool y
2564 depends on KEYS
2565endif
David Howellsee009e4a02011-03-07 15:06:20 +00002566
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002567endmenu
2568
2569
Keith Packarde5beae12008-11-03 18:21:45 +01002570config HAVE_ATOMIC_IOMAP
2571 def_bool y
2572 depends on X86_32
2573
Alessandro Rubini4692d772012-04-04 19:39:58 +02002574config X86_DEV_DMA_OPS
2575 bool
Alessandro Rubini83125a32012-04-04 19:40:21 +02002576 depends on X86_64 || STA2X11
Alessandro Rubini4692d772012-04-04 19:39:58 +02002577
Alessandro Rubinif7219a52012-04-04 19:40:10 +02002578config X86_DMA_REMAP
2579 bool
Alessandro Rubini83125a32012-04-04 19:40:21 +02002580 depends on STA2X11
Alessandro Rubinif7219a52012-04-04 19:40:10 +02002581
Li, Aubrey93e5ead2014-06-30 14:08:42 +08002582config PMC_ATOM
2583 def_bool y
2584 depends on PCI
2585
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002586source "net/Kconfig"
2587
2588source "drivers/Kconfig"
2589
2590source "drivers/firmware/Kconfig"
2591
2592source "fs/Kconfig"
2593
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002594source "arch/x86/Kconfig.debug"
2595
2596source "security/Kconfig"
2597
2598source "crypto/Kconfig"
2599
Avi Kivityedf88412007-12-16 11:02:48 +02002600source "arch/x86/kvm/Kconfig"
2601
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002602source "lib/Kconfig"