blob: 0dc9d0144a27957d2bd2cdadf3b141a3195ccab0 [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
Russell King82491452011-05-08 18:55:19 +010012 select CLKSRC_I8253
Catalin Marinasaf1839e2012-10-08 16:28:08 -070013 select HAVE_UID16
Sam Ravnborgdaa93fa2007-11-12 20:54:30 +010014
15config X86_64
Jan Beulich3120e252012-09-10 12:41:45 +010016 def_bool y
17 depends on 64BIT
Alessandro Rubini4692d772012-04-04 19:39:58 +020018 select X86_DEV_DMA_OPS
Linus Torvaldsbc08b442013-09-02 12:12:15 -070019 select ARCH_USE_CMPXCHG_LOCKREF
Sam Ravnborg1032c0b2007-11-06 21:35:08 +010020
21### Arch settings
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010022config X86
Harvey Harrison3c2362e2008-01-30 13:31:03 +010023 def_bool y
Hanjun Guo46ba51e2014-07-18 18:02:54 +080024 select ARCH_MIGHT_HAVE_ACPI_PDC if ACPI
Stephen Boyd446f24d2013-04-30 15:28:42 -070025 select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
Linus Torvalds72d93102014-09-13 11:14:53 -070026 select ARCH_HAS_FAST_MULTIPLIER
Riku Voipio957e3fa2014-12-12 16:57:44 -080027 select ARCH_HAS_GCOV_PROFILE_ALL
Mark Salter77fbbc82013-10-07 22:18:07 -040028 select ARCH_MIGHT_HAVE_PC_PARPORT
Mark Salter5e2c18c2014-01-01 11:34:16 -080029 select ARCH_MIGHT_HAVE_PC_SERIO
David Woodhousee17c6d52008-06-17 12:19:34 +010030 select HAVE_AOUT if X86_32
Ingo Molnara5574cf2008-05-05 23:19:50 +020031 select HAVE_UNSTABLE_SCHED_CLOCK
Mel Gorman4468dd72014-06-04 16:06:29 -070032 select ARCH_SUPPORTS_NUMA_BALANCING if X86_64
Peter Zijlstrabe5e6102013-11-18 18:27:06 +010033 select ARCH_SUPPORTS_INT128 if X86_64
Sam Ravnborgec7748b2008-02-09 10:46:40 +010034 select HAVE_IDE
Mathieu Desnoyers42d4b832008-02-02 15:10:34 -050035 select HAVE_OPROFILE
Ralf Baechle8761f1a2011-06-01 19:05:09 +010036 select HAVE_PCSPKR_PLATFORM
Peter Zijlstracc2067a2010-11-16 21:49:01 +010037 select HAVE_PERF_EVENTS
Rik van Riel28b2ee22008-07-23 21:27:05 -070038 select HAVE_IOREMAP_PROT
Mathieu Desnoyers3f550092008-02-02 15:10:35 -050039 select HAVE_KPROBES
Yinghai Lu72d7c3b2010-08-25 13:39:17 -070040 select HAVE_MEMBLOCK
Tejun Heo0608f702011-07-14 11:44:23 +020041 select HAVE_MEMBLOCK_NODE_MAP
Tejun Heoc378ddd2011-07-14 11:46:03 +020042 select ARCH_DISCARD_MEMBLOCK
Ingo Molnar1f972762008-07-26 13:52:50 +020043 select ARCH_WANT_OPTIONAL_GPIOLIB
Ingo Molnarda4276b2009-01-07 11:05:10 +010044 select ARCH_WANT_FRAME_POINTERS
FUJITA Tomonori7c095e42009-06-17 16:28:12 -070045 select HAVE_DMA_ATTRS
Akinobu Mita9c5a3622014-06-04 16:06:50 -070046 select HAVE_DMA_CONTIGUOUS
Ananth N Mavinakayanahalli9edddaa2008-03-04 14:28:37 -080047 select HAVE_KRETPROBES
Mark Salter5b7c73e2014-04-07 15:39:49 -070048 select GENERIC_EARLY_IOREMAP
Masami Hiramatsuc0f7ac32010-02-25 08:34:46 -050049 select HAVE_OPTPROBES
Masami Hiramatsue7dbfe32012-09-28 17:15:20 +090050 select HAVE_KPROBES_ON_FTRACE
Steven Rostedte4b2b882008-08-14 15:45:11 -040051 select HAVE_FTRACE_MCOUNT_RECORD
Steven Rostedtd57c5d52011-02-09 13:32:18 -050052 select HAVE_FENTRY if X86_64
Steven Rostedtcf4db252010-10-14 23:32:44 -040053 select HAVE_C_RECORDMCOUNT
Steven Rostedt677aa9f2008-05-17 00:01:36 -040054 select HAVE_DYNAMIC_FTRACE
Masami Hiramatsu06aeaae2012-09-28 17:15:17 +090055 select HAVE_DYNAMIC_FTRACE_WITH_REGS
Steven Rostedt606576c2008-10-06 19:06:12 -040056 select HAVE_FUNCTION_TRACER
Frederic Weisbecker48d68b22008-12-02 00:20:39 +010057 select HAVE_FUNCTION_GRAPH_TRACER
Steven Rostedt71e308a2009-06-18 12:45:08 -040058 select HAVE_FUNCTION_GRAPH_FP_TEST
Josh Stone66700002009-08-24 14:43:11 -070059 select HAVE_SYSCALL_TRACEPOINTS
Catalin Marinas7ac57a82012-10-08 16:28:16 -070060 select SYSCTL_EXCEPTION_TRACE
Ingo Molnare0ec9482009-01-27 17:01:14 +010061 select HAVE_KVM
Ingo Molnar49793b02009-01-27 17:02:29 +010062 select HAVE_ARCH_KGDB
Roland McGrath99bbc4b2008-04-20 14:35:12 -070063 select HAVE_ARCH_TRACEHOOK
Dmitry Baryshkov323ec002008-06-29 14:19:31 +040064 select HAVE_GENERIC_DMA_COHERENT if X86_32
Johannes Berg58340a02008-07-25 01:45:33 -070065 select HAVE_EFFICIENT_UNALIGNED_ACCESS
Török Edwin8d264872008-11-23 12:39:08 +020066 select USER_STACKTRACE_SUPPORT
Heiko Carstensf850c30c2010-02-10 17:25:17 +010067 select HAVE_REGS_AND_STACK_ACCESS_API
Joerg Roedel2118d0c2009-01-09 15:13:15 +010068 select HAVE_DMA_API_DEBUG
H. Peter Anvin2e9f3bd2009-01-04 15:41:25 -080069 select HAVE_KERNEL_GZIP
70 select HAVE_KERNEL_BZIP2
71 select HAVE_KERNEL_LZMA
Lasse Collin30314802011-01-12 17:01:24 -080072 select HAVE_KERNEL_XZ
Albin Tonnerre13510992010-01-08 14:42:45 -080073 select HAVE_KERNEL_LZO
Kyungsik Leef9b493a2013-07-08 16:01:48 -070074 select HAVE_KERNEL_LZ4
K.Prasad0067f122009-06-01 23:43:57 +053075 select HAVE_HW_BREAKPOINT
Frederic Weisbecker01027522010-04-11 18:55:56 +020076 select HAVE_MIXED_BREAKPOINTS_REGS
Frederic Weisbecker99e8c5a2009-12-17 01:33:54 +010077 select PERF_EVENTS
Frederic Weisbeckerc01d4322010-05-15 22:57:48 +020078 select HAVE_PERF_EVENTS_NMI
Jiri Olsac5e63192012-08-07 15:20:36 +020079 select HAVE_PERF_REGS
Jiri Olsac5ebced2012-08-07 15:20:40 +020080 select HAVE_PERF_USER_STACK_DUMP
Catalin Marinasb69ec422012-10-08 16:28:11 -070081 select HAVE_DEBUG_KMEMLEAK
Frederic Weisbecker99e8c5a2009-12-17 01:33:54 +010082 select ANON_INODES
H. Peter Anvineb068e72012-11-28 11:50:23 -080083 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
84 select HAVE_CMPXCHG_LOCAL
Heiko Carstens25654092012-01-12 17:17:33 -080085 select HAVE_CMPXCHG_DOUBLE
Pekka Enberg0a4af3b2009-02-26 21:38:56 +020086 select HAVE_ARCH_KMEMCHECK
Avi Kivity7c68af62009-09-19 09:40:22 +030087 select HAVE_USER_RETURN_NOTIFIER
David Daneye39f5602012-01-10 15:10:21 -080088 select ARCH_BINFMT_ELF_RANDOMIZE_PIE
Steven Rostedt46eb3b62010-09-22 23:10:23 -040089 select HAVE_ARCH_JUMP_LABEL
Catalin Marinas74634492012-07-30 14:41:09 -070090 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
Yinghai Lu141d55e2011-10-12 11:53:17 -070091 select SPARSE_IRQ
Jan Beulichc49aa5b2011-03-08 09:24:26 +000092 select GENERIC_FIND_FIRST_BIT
Thomas Gleixner3bb98082010-09-27 12:46:02 +000093 select GENERIC_IRQ_PROBE
94 select GENERIC_PENDING_IRQ if SMP
Thomas Gleixner517e4982010-12-16 17:59:57 +010095 select GENERIC_IRQ_SHOW
Martin Schwidefskyd1748302011-08-23 15:29:42 +020096 select GENERIC_CLOCKEVENTS_MIN_ADJUST
Thomas Gleixnerc01858082011-02-07 02:24:08 +010097 select IRQ_FORCED_THREADING
Sam Ravnborge47b65b2012-05-21 20:45:37 +020098 select HAVE_BPF_JIT if X86_64
Gerald Schaefer15626062012-10-08 16:30:04 -070099 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
Laura Abbott308c09f2014-08-08 14:23:25 -0700100 select ARCH_HAS_SG_CHAIN
Thomas Gleixner0a779c52011-06-09 13:08:26 +0000101 select CLKEVT_I8253
Huang Yingdf013ff2011-07-13 13:14:22 +0800102 select ARCH_HAVE_NMI_SAFE_CMPXCHG
Michael S. Tsirkin4673ca82011-11-24 14:54:28 +0200103 select GENERIC_IOMAP
Linus Torvaldse419b4c2012-05-03 10:16:43 -0700104 select DCACHE_WORD_ACCESS
Thomas Gleixner7eb43a62012-04-20 13:05:48 +0000105 select GENERIC_SMP_IDLE_THREAD
Will Deaconc1d7e012012-07-30 14:42:46 -0700106 select ARCH_WANT_IPC_PARSE_VERSION if X86_32
Will Drewryc6cfbeb2012-04-12 16:48:03 -0500107 select HAVE_ARCH_SECCOMP_FILTER
David Daney8b5ad472012-04-24 11:23:15 -0700108 select BUILDTIME_EXTABLE_SORT
Thomas Gleixnerbdebaf82012-05-18 16:45:44 +0000109 select GENERIC_CMOS_UPDATE
Cyrill Gorcunov2bf01f92014-06-04 16:08:16 -0700110 select HAVE_ARCH_SOFT_DIRTY if X86_64
Thomas Gleixnerbdebaf82012-05-18 16:45:44 +0000111 select CLOCKSOURCE_WATCHDOG
112 select GENERIC_CLOCKEVENTS
Stefani Seiboldd2312e32014-03-17 23:22:01 +0100113 select ARCH_CLOCKSOURCE_DATA
Thomas Gleixner09ec5442014-07-16 21:05:12 +0000114 select CLOCKSOURCE_VALIDATE_LAST_CYCLE
Thomas Gleixnerbdebaf82012-05-18 16:45:44 +0000115 select GENERIC_CLOCKEVENTS_BROADCAST if X86_64 || (X86_32 && X86_LOCAL_APIC)
Stefani Seiboldd2312e32014-03-17 23:22:01 +0100116 select GENERIC_TIME_VSYSCALL
Linus Torvalds4ae73f22012-05-26 10:14:39 -0700117 select GENERIC_STRNCPY_FROM_USER
Linus Torvalds5723aa92012-05-26 11:09:53 -0700118 select GENERIC_STRNLEN_USER
Frederic Weisbecker91d1aa432012-11-27 19:33:25 +0100119 select HAVE_CONTEXT_TRACKING if X86_64
Frederic Weisbeckerfdf9c352012-09-09 14:56:31 +0200120 select HAVE_IRQ_TIME_ACCOUNTING
Stephen Rothwell4febd952013-03-07 15:48:16 +1100121 select VIRT_TO_BUS
David Howells786d35d2012-09-28 14:31:03 +0930122 select MODULES_USE_ELF_REL if X86_32
123 select MODULES_USE_ELF_RELA if X86_64
Al Viro1d4b4b22012-10-22 22:34:11 -0400124 select CLONE_BACKWARDS if X86_32
David Woodhouse83a57a42012-12-20 01:16:20 +0000125 select ARCH_USE_BUILTIN_BSWAP
Waiman Longbd01ec12014-02-03 13:18:57 +0100126 select ARCH_USE_QUEUE_RWLOCK
Al Viro15ce1f72012-12-25 16:09:20 -0500127 select OLD_SIGSUSPEND3 if X86_32 || IA32_EMULATION
Al Viro5b3eb3a2012-12-25 19:14:55 -0500128 select OLD_SIGACTION if X86_32
129 select COMPAT_OLD_SIGACTION if IA32_EMULATION
Prarit Bhargava3195ef52013-02-14 12:02:54 -0500130 select RTC_LIB
Dave Hansend1a1dc02013-07-01 13:04:42 -0700131 select HAVE_DEBUG_STACKOVERFLOW
Frederic Weisbeckera2cd11f2013-09-24 17:18:36 +0200132 select HAVE_IRQ_EXIT_ON_IRQ_STACK if X86_64
Kees Cook19952a92013-12-19 11:35:58 -0800133 select HAVE_CC_STACKPROTECTOR
Ard Biesheuvel2b9c1f02014-02-08 13:34:10 +0100134 select GENERIC_CPU_AUTOPROBE
AKASHI Takahiro7a017722014-02-25 18:16:24 +0900135 select HAVE_ARCH_AUDITSYSCALL
Peter Zijlstra4badad32014-06-06 19:53:16 +0200136 select ARCH_SUPPORTS_ATOMIC_RMW
Tomasz Nowicki44a69f62014-07-22 11:20:12 +0200137 select HAVE_ACPI_APEI if ACPI
138 select HAVE_ACPI_APEI_NMI if ACPI
Graeme Gregory8a1664b2014-07-18 18:02:52 +0800139 select ACPI_LEGACY_TABLES_LOOKUP if ACPI
Josh Triplett9def39be2013-10-30 08:09:45 -0700140 select X86_FEATURE_NAMES if PROC_FS
Balbir Singh7d8330a2008-02-10 12:46:28 +0530141
Ingo Molnarba7e4d12009-06-06 13:58:12 +0200142config INSTRUCTION_DECODER
Jan Beulich3120e252012-09-10 12:41:45 +0100143 def_bool y
144 depends on KPROBES || PERF_EVENTS || UPROBES
Ingo Molnarba7e4d12009-06-06 13:58:12 +0200145
Peter Zijlstra7fb0f1d2014-10-24 09:12:35 +0200146config PERF_EVENTS_INTEL_UNCORE
147 def_bool y
Peter Zijlstra (Intel)ce5686d2014-10-29 11:17:04 +0100148 depends on PERF_EVENTS && CPU_SUP_INTEL && PCI
Peter Zijlstra7fb0f1d2014-10-24 09:12:35 +0200149
Linus Torvalds51b26ad2009-04-26 10:12:47 -0700150config OUTPUT_FORMAT
151 string
152 default "elf32-i386" if X86_32
153 default "elf64-x86-64" if X86_64
154
Sam Ravnborg73531902008-05-25 23:03:18 +0200155config ARCH_DEFCONFIG
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +0200156 string
Sam Ravnborg73531902008-05-25 23:03:18 +0200157 default "arch/x86/configs/i386_defconfig" if X86_32
158 default "arch/x86/configs/x86_64_defconfig" if X86_64
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +0200159
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100160config LOCKDEP_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100161 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100162
163config STACKTRACE_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100164 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100165
Heiko Carstensaa7d9352008-02-01 17:45:14 +0100166config HAVE_LATENCYTOP_SUPPORT
167 def_bool y
168
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100169config MMU
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100170 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100171
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100172config SBUS
173 bool
174
FUJITA Tomonori3bc4e452010-03-10 15:23:22 -0800175config NEED_DMA_MAP_STATE
Jan Beulich3120e252012-09-10 12:41:45 +0100176 def_bool y
177 depends on X86_64 || INTEL_IOMMU || DMA_API_DEBUG
FUJITA Tomonori3bc4e452010-03-10 15:23:22 -0800178
FUJITA Tomonori18e98302010-05-26 14:44:32 -0700179config NEED_SG_DMA_LENGTH
Andrew Morton4a14d842010-05-26 14:44:33 -0700180 def_bool y
FUJITA Tomonori18e98302010-05-26 14:44:32 -0700181
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100182config GENERIC_ISA_DMA
Jan Beulich3120e252012-09-10 12:41:45 +0100183 def_bool y
184 depends on ISA_DMA_API
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100185
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100186config GENERIC_BUG
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100187 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100188 depends on BUG
Jan Beulichb93a5312008-12-16 11:40:27 +0000189 select GENERIC_BUG_RELATIVE_POINTERS if X86_64
190
191config GENERIC_BUG_RELATIVE_POINTERS
192 bool
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100193
194config GENERIC_HWEIGHT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100195 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100196
197config ARCH_MAY_HAVE_PC_FDC
Jan Beulich3120e252012-09-10 12:41:45 +0100198 def_bool y
199 depends on ISA_DMA_API
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100200
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100201config RWSEM_XCHGADD_ALGORITHM
Jan Beulich3120e252012-09-10 12:41:45 +0100202 def_bool y
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100203
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100204config GENERIC_CALIBRATE_DELAY
205 def_bool y
206
venkatesh.pallipadi@intel.com9a0b8412008-01-31 17:35:06 -0800207config ARCH_HAS_CPU_RELAX
208 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100209
Pekka Enberg1b27d052008-04-28 02:12:22 -0700210config ARCH_HAS_CACHE_LINE_SIZE
211 def_bool y
212
Mike Travisdd5af902008-01-30 13:33:32 +0100213config HAVE_SETUP_PER_CPU_AREA
Brian Gerst89c9c4c2009-01-27 12:56:48 +0900214 def_bool y
travis@sgi.comb32ef632008-01-30 13:32:51 +0100215
Tejun Heo08fc4582009-08-14 15:00:49 +0900216config NEED_PER_CPU_EMBED_FIRST_CHUNK
217 def_bool y
218
219config NEED_PER_CPU_PAGE_FIRST_CHUNK
Tejun Heo11124412009-02-20 16:29:09 +0900220 def_bool y
221
Johannes Berg801e4062007-12-08 02:12:39 +0100222config ARCH_HIBERNATION_POSSIBLE
223 def_bool y
Johannes Berg801e4062007-12-08 02:12:39 +0100224
Johannes Bergf4cb5702007-12-08 02:14:00 +0100225config ARCH_SUSPEND_POSSIBLE
226 def_bool y
Johannes Bergf4cb5702007-12-08 02:14:00 +0100227
Steve Cappercfe28c52013-04-29 14:29:48 +0100228config ARCH_WANT_HUGE_PMD_SHARE
229 def_bool y
230
Steve Capper53313b22013-04-30 08:03:42 +0100231config ARCH_WANT_GENERAL_HUGETLB
232 def_bool y
233
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100234config ZONE_DMA32
235 bool
236 default X86_64
237
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100238config AUDIT_ARCH
239 bool
240 default X86_64
241
Ingo Molnar765c68b2008-04-09 11:03:37 +0200242config ARCH_SUPPORTS_OPTIMIZED_INLINING
243 def_bool y
244
Akinobu Mita6a11f752009-03-31 15:23:17 -0700245config ARCH_SUPPORTS_DEBUG_PAGEALLOC
246 def_bool y
247
Shane Wang69575d32009-09-01 18:25:07 -0700248config HAVE_INTEL_TXT
249 def_bool y
Kees Cook6ea30382012-10-02 11:16:47 -0700250 depends on INTEL_IOMMU && ACPI
Shane Wang69575d32009-09-01 18:25:07 -0700251
Sam Ravnborg6b0c3d42008-01-30 13:32:27 +0100252config X86_32_SMP
253 def_bool y
254 depends on X86_32 && SMP
255
256config X86_64_SMP
257 def_bool y
258 depends on X86_64 && SMP
259
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100260config X86_HT
Jan Beulich6fc108a2010-04-21 15:23:44 +0100261 def_bool y
Adrian Bunkee0011a2007-12-04 17:19:07 +0100262 depends on SMP
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100263
Tejun Heoccbeed32009-02-09 22:17:40 +0900264config X86_32_LAZY_GS
265 def_bool y
Tejun Heo60a53172009-02-09 22:17:40 +0900266 depends on X86_32 && !CC_STACKPROTECTOR
Tejun Heoccbeed32009-02-09 22:17:40 +0900267
Borislav Petkovd61931d2010-03-05 17:34:46 +0100268config ARCH_HWEIGHT_CFLAGS
269 string
270 default "-fcall-saved-ecx -fcall-saved-edx" if X86_32
271 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
272
Srikar Dronamraju2b144492012-02-09 14:56:42 +0530273config ARCH_SUPPORTS_UPROBES
274 def_bool y
275
Rob Herringd20642f2014-04-18 17:19:54 -0500276config FIX_EARLYCON_MEM
277 def_bool y
278
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100279source "init/Kconfig"
Matt Helsleydc52ddc2008-10-18 20:27:21 -0700280source "kernel/Kconfig.freezer"
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100281
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100282menu "Processor type and features"
283
Randy Dunlap5ee71532012-01-16 11:57:18 -0800284config ZONE_DMA
285 bool "DMA memory allocation support" if EXPERT
286 default y
287 help
288 DMA memory allocation support allows devices with less than 32-bit
289 addressing to allocate within the first 16MB of address space.
290 Disable if no such devices will be used.
291
292 If unsure, say Y.
293
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100294config SMP
295 bool "Symmetric multi-processing support"
296 ---help---
297 This enables support for systems with more than one CPU. If you have
Robert Graffham4a474152014-01-23 15:55:29 -0800298 a system with only one CPU, say N. If you have a system with more
299 than one CPU, say Y.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100300
Robert Graffham4a474152014-01-23 15:55:29 -0800301 If you say N here, the kernel will run on uni- and multiprocessor
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100302 machines, but will use only one CPU of a multiprocessor machine. If
303 you say Y here, the kernel will run on many, but not all,
Robert Graffham4a474152014-01-23 15:55:29 -0800304 uniprocessor machines. On a uniprocessor machine, the kernel
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100305 will run faster if you say N here.
306
307 Note that if you say Y here and choose architecture "586" or
308 "Pentium" under "Processor family", the kernel will not work on 486
309 architectures. Similarly, multiprocessor kernels for the "PPro"
310 architecture may not work on all Pentium based boards.
311
312 People using multiprocessor machines who say Y here should also say
313 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
314 Management" code will be disabled if you say Y here.
315
Paul Bolle395cf962011-08-15 02:02:26 +0200316 See also <file:Documentation/x86/i386/IO-APIC.txt>,
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100317 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
318 <http://www.tldp.org/docs.html#howto>.
319
320 If you don't know what to do here, say N.
321
Josh Triplett9def39be2013-10-30 08:09:45 -0700322config X86_FEATURE_NAMES
323 bool "Processor feature human-readable names" if EMBEDDED
324 default y
325 ---help---
326 This option compiles in a table of x86 feature bits and corresponding
327 names. This is required to support /proc/cpuinfo and a few kernel
328 messages. You can disable this to save space, at the expense of
329 making those few kernel messages show numeric feature bits instead.
330
331 If in doubt, say Y.
332
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800333config X86_X2APIC
334 bool "Support x2apic"
Suresh Siddhad3f13812011-08-23 17:05:25 -0700335 depends on X86_LOCAL_APIC && X86_64 && IRQ_REMAP
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800336 ---help---
337 This enables x2apic support on CPUs that have this feature.
338
339 This allows 32-bit apic IDs (so it can support very large systems),
340 and accesses the local apic via MSRs not via mmio.
341
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800342 If you don't know what to do here, say N.
343
Yinghai Lu6695c852008-06-19 12:13:09 -0700344config X86_MPPARSE
Bin Gao6e87f9b72012-10-25 09:35:44 -0700345 bool "Enable MPS table" if ACPI || SFI
Jan Beulich7a527682008-10-30 10:38:24 +0000346 default y
Ingo Molnar5ab74722008-07-10 14:42:03 +0200347 depends on X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100348 ---help---
Yinghai Lu6695c852008-06-19 12:13:09 -0700349 For old smp systems that do not have proper acpi support. Newer systems
350 (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
Yinghai Lu6695c852008-06-19 12:13:09 -0700351
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800352config X86_BIGSMP
353 bool "Support for big SMP systems with more than 8 CPUs"
354 depends on X86_32 && SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100355 ---help---
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800356 This option is needed for the systems that have more than 8 CPUs
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100357
Jun Nakajimaddd70cf2013-01-21 17:23:09 +0000358config GOLDFISH
359 def_bool y
360 depends on X86_GOLDFISH
361
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800362if X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800363config X86_EXTENDED_PLATFORM
364 bool "Support for extended (non-PC) x86 platforms"
365 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100366 ---help---
Ingo Molnar06ac8342009-01-27 18:11:43 +0100367 If you disable this option then the kernel will only support
368 standard PC platforms. (which covers the vast majority of
369 systems out there.)
370
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800371 If you enable this option then you'll be able to select support
372 for the following (non-PC) 32 bit x86 platforms:
Ben Hutchingscb7b8022013-06-24 01:05:25 +0100373 Goldfish (Android emulator)
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800374 AMD Elan
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800375 RDC R-321x SoC
376 SGI 320/540 (Visual Workstation)
Alessandro Rubini83125a32012-04-04 19:40:21 +0200377 STA2X11-based (e.g. Northville)
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200378 Moorestown MID devices
Ingo Molnar06ac8342009-01-27 18:11:43 +0100379
380 If you have one of these systems, or if you want to build a
381 generic distribution kernel, say Y here - otherwise say N.
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800382endif
Ingo Molnar06ac8342009-01-27 18:11:43 +0100383
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800384if X86_64
385config X86_EXTENDED_PLATFORM
386 bool "Support for extended (non-PC) x86 platforms"
387 default y
388 ---help---
389 If you disable this option then the kernel will only support
390 standard PC platforms. (which covers the vast majority of
391 systems out there.)
392
393 If you enable this option then you'll be able to select support
394 for the following (non-PC) 64 bit x86 platforms:
Steffen Persvold44b111b2011-12-06 00:07:26 +0800395 Numascale NumaChip
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800396 ScaleMP vSMP
397 SGI Ultraviolet
398
399 If you have one of these systems, or if you want to build a
400 generic distribution kernel, say Y here - otherwise say N.
401endif
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800402# This is an alphabetically sorted list of 64 bit extended platforms
403# Please maintain the alphabetic order if and when there are additions
Steffen Persvold44b111b2011-12-06 00:07:26 +0800404config X86_NUMACHIP
405 bool "Numascale NumaChip"
406 depends on X86_64
407 depends on X86_EXTENDED_PLATFORM
408 depends on NUMA
409 depends on SMP
410 depends on X86_X2APIC
Daniel J Bluemanf9726bf2012-12-07 14:24:32 -0700411 depends on PCI_MMCONFIG
Steffen Persvold44b111b2011-12-06 00:07:26 +0800412 ---help---
413 Adds support for Numascale NumaChip large-SMP systems. Needed to
414 enable more than ~168 cores.
415 If you don't have one of these, you should say N here.
Nick Piggin03b48632009-01-20 04:36:04 +0100416
Ingo Molnar6a485652009-01-27 18:29:13 +0100417config X86_VSMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800418 bool "ScaleMP vSMP"
Borislav Petkov6276a072013-03-04 21:20:21 +0100419 select HYPERVISOR_GUEST
Ingo Molnar6a485652009-01-27 18:29:13 +0100420 select PARAVIRT
421 depends on X86_64 && PCI
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800422 depends on X86_EXTENDED_PLATFORM
Shai Fultheimead91d42012-04-16 10:39:35 +0300423 depends on SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100424 ---help---
Ingo Molnar6a485652009-01-27 18:29:13 +0100425 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
426 supposed to run on these EM64T-based machines. Only choose this option
427 if you have one of these machines.
428
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800429config X86_UV
430 bool "SGI Ultraviolet"
431 depends on X86_64
432 depends on X86_EXTENDED_PLATFORM
Jack Steiner54c28d22009-04-03 15:39:42 -0500433 depends on NUMA
Suresh Siddha9d6c26e2009-04-20 13:02:31 -0700434 depends on X86_X2APIC
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800435 ---help---
436 This option is needed in order to support SGI Ultraviolet systems.
437 If you don't have one of these, you should say N here.
438
439# Following is an alphabetically sorted list of 32 bit extended platforms
440# Please maintain the alphabetic order if and when there are additions
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100441
Jun Nakajimaddd70cf2013-01-21 17:23:09 +0000442config X86_GOLDFISH
443 bool "Goldfish (Virtual Platform)"
Ben Hutchingscb7b8022013-06-24 01:05:25 +0100444 depends on X86_EXTENDED_PLATFORM
Jun Nakajimaddd70cf2013-01-21 17:23:09 +0000445 ---help---
446 Enable support for the Goldfish virtual platform used primarily
447 for Android development. Unless you are building for the Android
448 Goldfish emulator say N here.
449
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800450config X86_INTEL_CE
451 bool "CE4100 TV platform"
452 depends on PCI
453 depends on PCI_GODIRECT
Jiang Liu6084a6e2014-06-09 16:19:46 +0800454 depends on X86_IO_APIC
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800455 depends on X86_32
456 depends on X86_EXTENDED_PLATFORM
Dirk Brandewie37bc9f52010-11-09 12:08:08 -0800457 select X86_REBOOTFIXUPS
Sebastian Andrzej Siewiorda6b7372011-02-22 21:07:37 +0100458 select OF
459 select OF_EARLY_FLATTREE
Grant Likelyb4e51852011-12-16 15:50:17 -0700460 select IRQ_DOMAIN
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800461 ---help---
462 Select for the Intel CE media processor (CE4100) SOC.
463 This option compiles in support for the CE4100 SOC for settop
464 boxes and media devices.
465
David Cohen4cb9b002013-12-16 17:37:26 -0800466config X86_INTEL_MID
Alan Cox43605ef2011-07-12 17:49:29 +0100467 bool "Intel MID platform support"
468 depends on X86_32
469 depends on X86_EXTENDED_PLATFORM
David Cohenedc6bc72014-01-21 10:41:39 -0800470 depends on X86_PLATFORM_DEVICES
Alan Cox1ea7c672011-11-10 13:29:14 +0000471 depends on PCI
472 depends on PCI_GOANY
473 depends on X86_IO_APIC
Alan Cox7c9c3a12011-12-29 14:43:16 +0000474 select SFI
David Cohen4cb9b002013-12-16 17:37:26 -0800475 select I2C
Alan Cox7c9c3a12011-12-29 14:43:16 +0000476 select DW_APB_TIMER
Alan Cox1ea7c672011-11-10 13:29:14 +0000477 select APB_TIMER
Alan Cox1ea7c672011-11-10 13:29:14 +0000478 select INTEL_SCU_IPC
Mika Westerberg15a713d2012-01-26 17:35:05 +0000479 select MFD_INTEL_MSIC
Alan Cox1ea7c672011-11-10 13:29:14 +0000480 ---help---
David Cohen4cb9b002013-12-16 17:37:26 -0800481 Select to build a kernel capable of supporting Intel MID (Mobile
482 Internet Device) platform systems which do not have the PCI legacy
483 interfaces. If you are building for a PC class system say N here.
Alan Cox1ea7c672011-11-10 13:29:14 +0000484
David Cohen4cb9b002013-12-16 17:37:26 -0800485 Intel MID platforms are based on an Intel processor and chipset which
486 consume less power than most of the x86 derivatives.
Alan Cox43605ef2011-07-12 17:49:29 +0100487
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000488config X86_INTEL_LPSS
489 bool "Intel Low Power Subsystem Support"
490 depends on ACPI
491 select COMMON_CLK
Mathias Nyman0f531432013-09-13 17:02:29 +0300492 select PINCTRL
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000493 ---help---
494 Select to build support for Intel Low Power Subsystem such as
495 found on Intel Lynxpoint PCH. Selecting this option enables
Mathias Nyman0f531432013-09-13 17:02:29 +0300496 things like clock tree (common clock framework) and pincontrol
497 which are needed by the LPSS peripheral drivers.
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000498
David E. Boxced3ce72014-09-17 22:13:50 -0700499config IOSF_MBI
500 tristate "Intel SoC IOSF Sideband support for SoC platforms"
501 depends on PCI
502 ---help---
503 This option enables sideband register access support for Intel SoC
504 platforms. On these platforms the IOSF sideband is used in lieu of
505 MSR's for some register accesses, mostly but not limited to thermal
506 and power. Drivers may query the availability of this device to
507 determine if they need the sideband in order to work on these
508 platforms. The sideband is available on the following SoC products.
509 This list is not meant to be exclusive.
510 - BayTrail
511 - Braswell
512 - Quark
513
514 You should say Y if you are running a kernel on one of these SoC's.
515
David E. Boxed2226b2014-09-17 22:13:51 -0700516config IOSF_MBI_DEBUG
517 bool "Enable IOSF sideband access through debugfs"
518 depends on IOSF_MBI && DEBUG_FS
519 ---help---
520 Select this option to expose the IOSF sideband access registers (MCR,
521 MDR, MCRX) through debugfs to write and read register information from
522 different units on the SoC. This is most useful for obtaining device
523 state information for debug and analysis. As this is a general access
524 mechanism, users of this option would have specific knowledge of the
525 device they want to access.
526
527 If you don't require the option or are in doubt, say N.
528
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800529config X86_RDC321X
530 bool "RDC R-321x SoC"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100531 depends on X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800532 depends on X86_EXTENDED_PLATFORM
533 select M486
534 select X86_REBOOTFIXUPS
535 ---help---
536 This option is needed for RDC R-321x system-on-chip, also known
537 as R-8610-(G).
538 If you don't have one of these chips, you should say N here.
539
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100540config X86_32_NON_STANDARD
Ingo Molnar9c398012009-01-27 18:24:57 +0100541 bool "Support non-standard 32-bit SMP architectures"
542 depends on X86_32 && SMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800543 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100544 ---help---
H. Peter Anvinb5660ba2014-02-25 12:14:06 -0800545 This option compiles in the bigsmp and STA2X11 default
546 subarchitectures. It is intended for a generic binary
547 kernel. If you select them all, kernel will probe it one by
548 one and will fallback to default.
Yinghai Lud49c4282008-06-08 18:31:54 -0700549
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800550# Alphabetically sorted list of Non standard 32 bit platforms
Yinghai Lud49c4282008-06-08 18:31:54 -0700551
Linus Torvaldsd949f362009-09-26 09:35:07 -0700552config X86_SUPPORTS_MEMORY_FAILURE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100553 def_bool y
Linus Torvaldsd949f362009-09-26 09:35:07 -0700554 # MCE code calls memory_failure():
555 depends on X86_MCE
556 # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
Linus Torvaldsd949f362009-09-26 09:35:07 -0700557 # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
558 depends on X86_64 || !SPARSEMEM
559 select ARCH_SUPPORTS_MEMORY_FAILURE
Linus Torvaldsd949f362009-09-26 09:35:07 -0700560
Alessandro Rubini83125a32012-04-04 19:40:21 +0200561config STA2X11
562 bool "STA2X11 Companion Chip Support"
563 depends on X86_32_NON_STANDARD && PCI
564 select X86_DEV_DMA_OPS
565 select X86_DMA_REMAP
566 select SWIOTLB
567 select MFD_STA2X11
568 select ARCH_REQUIRE_GPIOLIB
569 default n
570 ---help---
571 This adds support for boards based on the STA2X11 IO-Hub,
572 a.k.a. "ConneXt". The chip is used in place of the standard
573 PC chipset, so all "standard" peripherals are missing. If this
574 option is selected the kernel will still be able to boot on
575 standard PC machines.
576
Shérab82148d12010-09-25 06:06:57 +0200577config X86_32_IRIS
578 tristate "Eurobraille/Iris poweroff module"
579 depends on X86_32
580 ---help---
581 The Iris machines from EuroBraille do not have APM or ACPI support
582 to shut themselves down properly. A special I/O sequence is
583 needed to do so, which is what this module does at
584 kernel shutdown.
585
586 This is only for Iris machines from EuroBraille.
587
588 If unused, say N.
589
Ingo Molnarae1e9132008-11-11 09:05:16 +0100590config SCHED_OMIT_FRAME_POINTER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100591 def_bool y
592 prompt "Single-depth WCHAN output"
Ken Chena87d0912008-11-06 11:10:49 -0800593 depends on X86
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100594 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100595 Calculate simpler /proc/<PID>/wchan values. If this option
596 is disabled then wchan values will recurse back to the
597 caller function. This provides more accurate wchan values,
598 at the expense of slightly more scheduling overhead.
599
600 If in doubt, say "Y".
601
Borislav Petkov6276a072013-03-04 21:20:21 +0100602menuconfig HYPERVISOR_GUEST
603 bool "Linux guest support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100604 ---help---
Borislav Petkov6276a072013-03-04 21:20:21 +0100605 Say Y here to enable options for running Linux under various hyper-
606 visors. This option enables basic hypervisor detection and platform
607 setup.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100608
Borislav Petkov6276a072013-03-04 21:20:21 +0100609 If you say N, all options in this submenu will be skipped and
610 disabled, and Linux guest support won't be built in.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100611
Borislav Petkov6276a072013-03-04 21:20:21 +0100612if HYPERVISOR_GUEST
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100613
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100614config PARAVIRT
615 bool "Enable paravirtualization code"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100616 ---help---
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100617 This changes the kernel so it can modify itself when it is run
618 under a hypervisor, potentially improving performance significantly
619 over full virtualization. However, when run without a hypervisor
620 the kernel is theoretically slower and slightly larger.
621
Borislav Petkov6276a072013-03-04 21:20:21 +0100622config PARAVIRT_DEBUG
623 bool "paravirt-ops debugging"
624 depends on PARAVIRT && DEBUG_KERNEL
625 ---help---
626 Enable to debug paravirt_ops internals. Specifically, BUG if
627 a paravirt_op is missing when it is called.
628
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700629config PARAVIRT_SPINLOCKS
630 bool "Paravirtualization layer for spinlocks"
Kees Cook6ea30382012-10-02 11:16:47 -0700631 depends on PARAVIRT && SMP
Raghavendra K T8db73262013-08-09 19:51:50 +0530632 select UNINLINE_SPIN_UNLOCK
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700633 ---help---
634 Paravirtualized spinlocks allow a pvops backend to replace the
635 spinlock implementation with something virtualization-friendly
636 (for example, block the virtual CPU rather than spinning).
637
Raghavendra K T4c4e4f62013-10-21 21:35:08 +0530638 It has a minimal impact on native kernels and gives a nice performance
639 benefit on paravirtualized KVM / Xen kernels.
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700640
Raghavendra K T4c4e4f62013-10-21 21:35:08 +0530641 If you are unsure how to answer this question, answer Y.
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700642
Borislav Petkov6276a072013-03-04 21:20:21 +0100643source "arch/x86/xen/Kconfig"
644
645config KVM_GUEST
646 bool "KVM Guest support (including kvmclock)"
647 depends on PARAVIRT
648 select PARAVIRT_CLOCK
649 default y
650 ---help---
651 This option enables various optimizations for running under the KVM
652 hypervisor. It includes a paravirtualized clock, so that instead
653 of relying on a PIT (or probably other) emulation by the
654 underlying device model, the host provides the guest with
655 timing infrastructure such as time of day, and system time
656
Srivatsa Vaddagiri1e20eb82013-08-09 19:52:01 +0530657config KVM_DEBUG_FS
658 bool "Enable debug information for KVM Guests in debugfs"
659 depends on KVM_GUEST && DEBUG_FS
660 default n
661 ---help---
662 This option enables collection of various statistics for KVM guest.
663 Statistics are displayed in debugfs filesystem. Enabling this option
664 may incur significant overhead.
665
Borislav Petkov6276a072013-03-04 21:20:21 +0100666source "arch/x86/lguest/Kconfig"
667
668config PARAVIRT_TIME_ACCOUNTING
669 bool "Paravirtual steal time accounting"
670 depends on PARAVIRT
671 default n
672 ---help---
673 Select this option to enable fine granularity task steal time
674 accounting. Time spent executing other tasks in parallel with
675 the current vCPU is discounted from the vCPU power. To account for
676 that, there can be a small performance impact.
677
678 If in doubt, say N here.
679
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200680config PARAVIRT_CLOCK
681 bool
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200682
Borislav Petkov6276a072013-03-04 21:20:21 +0100683endif #HYPERVISOR_GUEST
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400684
Yinghai Lu08677212010-02-10 01:20:20 -0800685config NO_BOOTMEM
Yinghai Lu774ea0b2010-08-25 13:39:18 -0700686 def_bool y
Yinghai Lu08677212010-02-10 01:20:20 -0800687
Yinghai Lu03273182008-04-18 17:49:15 -0700688config MEMTEST
689 bool "Memtest"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100690 ---help---
Yinghai Luc64df702008-03-21 18:56:19 -0700691 This option adds a kernel parameter 'memtest', which allows memtest
Yinghai Lu03273182008-04-18 17:49:15 -0700692 to be set.
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100693 memtest=0, mean disabled; -- default
694 memtest=1, mean do 1 test pattern;
695 ...
696 memtest=4, mean do 4 test patterns.
Thomas Gleixneraba37282008-07-15 14:48:48 +0200697 If you are unsure how to answer this question, answer N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100698
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100699source "arch/x86/Kconfig.cpu"
700
701config HPET_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100702 def_bool X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100703 prompt "HPET Timer Support" if X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100704 ---help---
705 Use the IA-PC HPET (High Precision Event Timer) to manage
706 time in preference to the PIT and RTC, if a HPET is
707 present.
708 HPET is the next generation timer replacing legacy 8254s.
709 The HPET provides a stable time base on SMP
710 systems, unlike the TSC, but it is more expensive to access,
711 as it is off-chip. You can find the HPET spec at
712 <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100713
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100714 You can safely choose Y here. However, HPET will only be
715 activated if the platform and the BIOS support this feature.
716 Otherwise the 8254 will be used for timing services.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100717
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100718 Choose N to continue using the legacy 8254 timer.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100719
720config HPET_EMULATE_RTC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100721 def_bool y
Bernhard Walle9d8af782008-02-06 01:38:52 -0800722 depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100723
Jacob Panbb24c472009-09-02 07:37:17 -0700724config APB_TIMER
Alan Cox933b9462011-12-17 17:43:40 +0000725 def_bool y if X86_INTEL_MID
726 prompt "Intel MID APB Timer Support" if X86_INTEL_MID
Jamie Iles06c3df42011-06-06 12:43:07 +0100727 select DW_APB_TIMER
Alan Coxa0c38322011-12-17 21:57:25 +0000728 depends on X86_INTEL_MID && SFI
Jacob Panbb24c472009-09-02 07:37:17 -0700729 help
730 APB timer is the replacement for 8254, HPET on X86 MID platforms.
731 The APBT provides a stable time base on SMP
732 systems, unlike the TSC, but it is more expensive to access,
733 as it is off-chip. APB timers are always running regardless of CPU
734 C states, they are used as per CPU clockevent device when possible.
735
David Rientjes6a108a12011-01-20 14:44:16 -0800736# Mark as expert because too many people got it wrong.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100737# The code disables itself when not needed.
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700738config DMI
739 default y
Ard Biesheuvelcf074402014-01-23 15:54:39 -0800740 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
David Rientjes6a108a12011-01-20 14:44:16 -0800741 bool "Enable DMI scanning" if EXPERT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100742 ---help---
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700743 Enabled scanning of DMI to identify machine quirks. Say Y
744 here unless you have verified that your setup is not
745 affected by entries in the DMI blacklist. Required by PNP
746 BIOS code.
747
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100748config GART_IOMMU
Andi Kleen38901f12013-10-04 14:37:56 -0700749 bool "Old AMD GART IOMMU support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100750 select SWIOTLB
Andreas Herrmann23ac4ae2010-09-17 18:03:43 +0200751 depends on X86_64 && PCI && AMD_NB
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100752 ---help---
Ingo Molnarced3c422013-10-06 11:45:20 +0200753 Provides a driver for older AMD Athlon64/Opteron/Turion/Sempron
754 GART based hardware IOMMUs.
755
756 The GART supports full DMA access for devices with 32-bit access
757 limitations, on systems with more than 3 GB. This is usually needed
758 for USB, sound, many IDE/SATA chipsets and some other devices.
759
760 Newer systems typically have a modern AMD IOMMU, supported via
761 the CONFIG_AMD_IOMMU=y config option.
762
763 In normal configurations this driver is only active when needed:
764 there's more than 3 GB of memory and the system contains a
765 32-bit limited device.
766
767 If unsure, say Y.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100768
769config CALGARY_IOMMU
770 bool "IBM Calgary IOMMU support"
771 select SWIOTLB
Kees Cook6ea30382012-10-02 11:16:47 -0700772 depends on X86_64 && PCI
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100773 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100774 Support for hardware IOMMUs in IBM's xSeries x366 and x460
775 systems. Needed to run systems with more than 3GB of memory
776 properly with 32-bit PCI devices that do not support DAC
777 (Double Address Cycle). Calgary also supports bus level
778 isolation, where all DMAs pass through the IOMMU. This
779 prevents them from going anywhere except their intended
780 destination. This catches hard-to-find kernel bugs and
781 mis-behaving drivers and devices that do not use the DMA-API
782 properly to set up their DMA buffers. The IOMMU can be
783 turned off at boot time with the iommu=off parameter.
784 Normally the kernel will make the right choice by itself.
785 If unsure, say Y.
786
787config CALGARY_IOMMU_ENABLED_BY_DEFAULT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100788 def_bool y
789 prompt "Should Calgary be enabled by default?"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100790 depends on CALGARY_IOMMU
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100791 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100792 Should Calgary be enabled by default? if you choose 'y', Calgary
793 will be used (if it exists). If you choose 'n', Calgary will not be
794 used even if it exists. If you choose 'n' and would like to use
795 Calgary anyway, pass 'iommu=calgary' on the kernel command line.
796 If unsure, say Y.
797
798# need this always selected by IOMMU for the VIA workaround
799config SWIOTLB
Joerg Roedela1afd012008-11-18 12:44:21 +0100800 def_bool y if X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100801 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100802 Support for software bounce buffers used on x86-64 systems
Joe Millenbach4454d322012-09-02 17:38:20 -0700803 which don't have a hardware IOMMU. Using this PCI devices
804 which can only access 32-bits of memory can be used on systems
805 with more than 3 GB of memory.
806 If unsure, say Y.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100807
FUJITA Tomonoria8522502008-04-29 00:59:36 -0700808config IOMMU_HELPER
Jan Beulich3120e252012-09-10 12:41:45 +0100809 def_bool y
810 depends on CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700811
Mike Travis1184dc22008-05-12 21:21:12 +0200812config MAXSMP
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200813 bool "Enable Maximum number of SMP Processors and NUMA Nodes"
Kees Cook6ea30382012-10-02 11:16:47 -0700814 depends on X86_64 && SMP && DEBUG_KERNEL
Mike Travis36f51012008-12-16 17:33:51 -0800815 select CPUMASK_OFFSTACK
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100816 ---help---
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200817 Enable maximum number of CPUS and NUMA Nodes for this architecture.
Mike Travis1184dc22008-05-12 21:21:12 +0200818 If unsure, say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100819
820config NR_CPUS
Mike Travis36f51012008-12-16 17:33:51 -0800821 int "Maximum number of CPUs" if SMP && !MAXSMP
Michael K. Johnson2a3313f2009-04-21 21:44:48 -0400822 range 2 8 if SMP && X86_32 && !X86_BIGSMP
Josh Boyerbb61ccc2013-11-05 09:37:29 -0500823 range 2 512 if SMP && !MAXSMP && !CPUMASK_OFFSTACK
Josh Boyerb53b5ed2013-11-05 09:38:16 -0500824 range 2 8192 if SMP && !MAXSMP && CPUMASK_OFFSTACK && X86_64
Mike Travis78637a972008-12-16 17:34:00 -0800825 default "1" if !SMP
Josh Boyerb53b5ed2013-11-05 09:38:16 -0500826 default "8192" if MAXSMP
H. Peter Anvinb5660ba2014-02-25 12:14:06 -0800827 default "32" if SMP && X86_BIGSMP
Mike Travis78637a972008-12-16 17:34:00 -0800828 default "8" if SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100829 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100830 This allows you to specify the maximum number of CPUs which this
Josh Boyerbb61ccc2013-11-05 09:37:29 -0500831 kernel will support. If CPUMASK_OFFSTACK is enabled, the maximum
832 supported value is 4096, otherwise the maximum value is 512. The
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100833 minimum value which makes sense is 2.
834
835 This is purely to save memory - each supported CPU adds
836 approximately eight kilobytes to the kernel image.
837
838config SCHED_SMT
839 bool "SMT (Hyperthreading) scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800840 depends on X86_HT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100841 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100842 SMT scheduler support improves the CPU scheduler's decision making
843 when dealing with Intel Pentium 4 chips with HyperThreading at a
844 cost of slightly increased overhead in some places. If unsure say
845 N here.
846
847config SCHED_MC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100848 def_bool y
849 prompt "Multi-core scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800850 depends on X86_HT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100851 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100852 Multi-core scheduler support improves the CPU scheduler's decision
853 making when dealing with multi-core CPU chips at a cost of slightly
854 increased overhead in some places. If unsure say N here.
855
856source "kernel/Kconfig.preempt"
857
858config X86_UP_APIC
859 bool "Local APIC support on uniprocessors"
Bryan O'Donoghue38a1dfd2015-01-22 22:58:49 +0000860 depends on X86_32 && !SMP && !X86_32_NON_STANDARD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100861 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100862 A local APIC (Advanced Programmable Interrupt Controller) is an
863 integrated interrupt controller in the CPU. If you have a single-CPU
864 system which has a processor with a local APIC, you can say Y here to
865 enable and use it. If you say Y here even though your machine doesn't
866 have a local APIC, then the kernel will still run with no slowdown at
867 all. The local APIC supports CPU-generated self-interrupts (timer,
868 performance counters), and the NMI watchdog which detects hard
869 lockups.
870
Bryan O'Donoghue38a1dfd2015-01-22 22:58:49 +0000871config X86_UP_APIC_MSI
872 def_bool y
873 select X86_UP_APIC if X86_32 && !SMP && !X86_32_NON_STANDARD && PCI_MSI
874
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100875config X86_UP_IOAPIC
876 bool "IO-APIC support on uniprocessors"
877 depends on X86_UP_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100878 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100879 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
880 SMP-capable replacement for PC-style interrupt controllers. Most
881 SMP systems and many recent uniprocessor systems have one.
882
883 If you have a single-CPU system with an IO-APIC, you can say Y here
884 to use it. If you say Y here even though your machine doesn't have
885 an IO-APIC, then the kernel will still run with no slowdown at all.
886
887config X86_LOCAL_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100888 def_bool y
Thomas Petazzoni0dbc6072013-10-03 11:59:14 +0200889 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC || PCI_MSI
Jiang Liu74afab72014-10-27 16:12:00 +0800890 select GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100891
892config X86_IO_APIC
Jiang Liu2f600022014-10-27 16:12:06 +0800893 def_bool X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_IOAPIC
894 depends on X86_LOCAL_APIC
Jiang Liud7f3d472014-06-09 16:19:52 +0800895 select IRQ_DOMAIN
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100896
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200897config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
898 bool "Reroute for broken boot IRQs"
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200899 depends on X86_IO_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100900 ---help---
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200901 This option enables a workaround that fixes a source of
902 spurious interrupts. This is recommended when threaded
903 interrupt handling is used on systems where the generation of
904 superfluous "boot interrupts" cannot be disabled.
905
906 Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
907 entry in the chipset's IO-APIC is masked (as, e.g. the RT
908 kernel does during interrupt handling). On chipsets where this
909 boot IRQ generation cannot be disabled, this workaround keeps
910 the original IRQ line masked so that only the equivalent "boot
911 IRQ" is delivered to the CPUs. The workaround also tells the
912 kernel to set up the IRQ handler on the boot IRQ line. In this
913 way only one interrupt is delivered to the kernel. Otherwise
914 the spurious second interrupt may cause the kernel to bring
915 down (vital) interrupt lines.
916
917 Only affects "broken" chipsets. Interrupt sharing may be
918 increased on these systems.
919
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100920config X86_MCE
Andi Kleenbab9bc62009-07-09 00:31:38 +0200921 bool "Machine Check / overheating reporting"
Borislav Petkove57dbaf2011-09-13 15:23:21 +0200922 default y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100923 ---help---
Andi Kleenbab9bc62009-07-09 00:31:38 +0200924 Machine Check support allows the processor to notify the
925 kernel if it detects a problem (e.g. overheating, data corruption).
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100926 The action the kernel takes depends on the severity of the problem,
Andi Kleenbab9bc62009-07-09 00:31:38 +0200927 ranging from warning messages to halting the machine.
Andi Kleen4efc0672009-04-28 19:07:31 +0200928
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100929config X86_MCE_INTEL
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100930 def_bool y
931 prompt "Intel MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +0200932 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100933 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100934 Additional support for intel specific MCE features such as
935 the thermal monitor.
936
937config X86_MCE_AMD
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100938 def_bool y
939 prompt "AMD MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +0200940 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100941 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100942 Additional support for AMD specific MCE features such as
943 the DRAM Error Threshold.
944
Andi Kleen4efc0672009-04-28 19:07:31 +0200945config X86_ANCIENT_MCE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100946 bool "Support for old Pentium 5 / WinChip machine checks"
Andi Kleenc31d9632009-07-09 00:31:37 +0200947 depends on X86_32 && X86_MCE
Hidetoshi Setocd13adcc2009-05-27 16:57:31 +0900948 ---help---
949 Include support for machine check handling on old Pentium 5 or WinChip
Masanari Iida5065a702013-11-30 21:38:43 +0900950 systems. These typically need to be enabled explicitly on the command
Hidetoshi Setocd13adcc2009-05-27 16:57:31 +0900951 line.
Andi Kleen4efc0672009-04-28 19:07:31 +0200952
Andi Kleenb2762682009-02-12 13:49:31 +0100953config X86_MCE_THRESHOLD
954 depends on X86_MCE_AMD || X86_MCE_INTEL
Jan Beulich6fc108a2010-04-21 15:23:44 +0100955 def_bool y
Andi Kleenb2762682009-02-12 13:49:31 +0100956
Andi Kleenea149b32009-04-29 19:31:00 +0200957config X86_MCE_INJECT
Andi Kleenc1ebf832009-07-09 00:31:41 +0200958 depends on X86_MCE
Andi Kleenea149b32009-04-29 19:31:00 +0200959 tristate "Machine check injector support"
960 ---help---
961 Provide support for injecting machine checks for testing purposes.
962 If you don't know what a machine check is and you don't do kernel
963 QA it is safe to say n.
964
Andi Kleen4efc0672009-04-28 19:07:31 +0200965config X86_THERMAL_VECTOR
966 def_bool y
Andi Kleen5bb38ad2009-07-09 00:31:39 +0200967 depends on X86_MCE_INTEL
Andi Kleen4efc0672009-04-28 19:07:31 +0200968
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100969config VM86
David Rientjes6a108a12011-01-20 14:44:16 -0800970 bool "Enable VM86 support" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100971 default y
972 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100973 ---help---
H. Peter Anvin34273f42014-05-04 10:36:22 -0700974 This option is required by programs like DOSEMU to run
975 16-bit real mode legacy code on x86 processors. It also may
976 be needed by software like XFree86 to initialize some video
977 cards via BIOS. Disabling this option saves about 6K.
978
979config X86_16BIT
980 bool "Enable support for 16-bit segments" if EXPERT
981 default y
982 ---help---
983 This option is required by programs like Wine to run 16-bit
984 protected mode legacy code on x86 processors. Disabling
985 this option saves about 300 bytes on i386, or around 6K text
986 plus 16K runtime memory on x86-64,
987
988config X86_ESPFIX32
989 def_bool y
990 depends on X86_16BIT && X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100991
H. Peter Anvin197725d2014-05-04 10:00:49 -0700992config X86_ESPFIX64
993 def_bool y
H. Peter Anvin34273f42014-05-04 10:36:22 -0700994 depends on X86_16BIT && X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100995
Andy Lutomirski1ad83c82014-10-29 14:33:47 -0700996config X86_VSYSCALL_EMULATION
997 bool "Enable vsyscall emulation" if EXPERT
998 default y
999 depends on X86_64
1000 ---help---
1001 This enables emulation of the legacy vsyscall page. Disabling
1002 it is roughly equivalent to booting with vsyscall=none, except
1003 that it will also disable the helpful warning if a program
1004 tries to use a vsyscall. With this option set to N, offending
1005 programs will just segfault, citing addresses of the form
1006 0xffffffffff600?00.
1007
1008 This option is required by many programs built before 2013, and
1009 care should be used even with newer programs if set to N.
1010
1011 Disabling this option saves about 7K of kernel size and
1012 possibly 4K of additional runtime pagetable memory.
1013
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001014config TOSHIBA
1015 tristate "Toshiba Laptop support"
1016 depends on X86_32
1017 ---help---
1018 This adds a driver to safely access the System Management Mode of
1019 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
1020 not work on models with a Phoenix BIOS. The System Management Mode
1021 is used to set the BIOS and power saving options on Toshiba portables.
1022
1023 For information on utilities to make use of this driver see the
1024 Toshiba Linux utilities web site at:
1025 <http://www.buzzard.org.uk/toshiba/>.
1026
1027 Say Y if you intend to run this kernel on a Toshiba portable.
1028 Say N otherwise.
1029
1030config I8K
1031 tristate "Dell laptop support"
Jean Delvare949a9d72011-05-25 20:43:33 +02001032 select HWMON
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001033 ---help---
1034 This adds a driver to safely access the System Management Mode
1035 of the CPU on the Dell Inspiron 8000. The System Management Mode
1036 is used to read cpu temperature and cooling fan status and to
1037 control the fans on the I8K portables.
1038
1039 This driver has been tested only on the Inspiron 8000 but it may
1040 also work with other Dell laptops. You can force loading on other
1041 models by passing the parameter `force=1' to the module. Use at
1042 your own risk.
1043
1044 For information on utilities to make use of this driver see the
1045 I8K Linux utilities web site at:
1046 <http://people.debian.org/~dz/i8k/>
1047
1048 Say Y if you intend to run this kernel on a Dell Inspiron 8000.
1049 Say N otherwise.
1050
1051config X86_REBOOTFIXUPS
Jan Beulich9ba16082008-10-15 22:01:38 -07001052 bool "Enable X86 board specific fixups for reboot"
1053 depends on X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001054 ---help---
1055 This enables chipset and/or board specific fixups to be done
1056 in order to get reboot to work correctly. This is only needed on
1057 some combinations of hardware and BIOS. The symptom, for which
1058 this config is intended, is when reboot ends with a stalled/hung
1059 system.
1060
1061 Currently, the only fixup is for the Geode machines using
Florian Fainelli5e3a77e2008-01-30 13:33:36 +01001062 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001063
1064 Say Y if you want to enable the fixup. Currently, it's safe to
1065 enable this option even if you don't need it.
1066 Say N otherwise.
1067
1068config MICROCODE
Borislav Petkove43f6e62012-08-01 19:17:01 +02001069 tristate "CPU microcode loading support"
Borislav Petkov80030e32013-10-13 18:36:29 +02001070 depends on CPU_SUP_AMD || CPU_SUP_INTEL
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001071 select FW_LOADER
1072 ---help---
Borislav Petkove43f6e62012-08-01 19:17:01 +02001073
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001074 If you say Y here, you will be able to update the microcode on
Peter Oruba80cc9f12008-07-28 18:44:22 +02001075 certain Intel and AMD processors. The Intel support is for the
Borislav Petkove43f6e62012-08-01 19:17:01 +02001076 IA32 family, e.g. Pentium Pro, Pentium II, Pentium III, Pentium 4,
1077 Xeon etc. The AMD support is for families 0x10 and later. You will
1078 obviously need the actual microcode binary data itself which is not
1079 shipped with the Linux kernel.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001080
Peter Oruba8d86f392008-07-28 18:44:21 +02001081 This option selects the general module only, you need to select
1082 at least one vendor specific module as well.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001083
Borislav Petkove43f6e62012-08-01 19:17:01 +02001084 To compile this driver as a module, choose M here: the module
1085 will be called microcode.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001086
Peter Oruba8d86f392008-07-28 18:44:21 +02001087config MICROCODE_INTEL
Borislav Petkove43f6e62012-08-01 19:17:01 +02001088 bool "Intel microcode loading support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001089 depends on MICROCODE
1090 default MICROCODE
1091 select FW_LOADER
1092 ---help---
1093 This options enables microcode patch loading support for Intel
1094 processors.
Peter Oruba8d86f392008-07-28 18:44:21 +02001095
Alanb8989db2014-01-20 18:01:56 +00001096 For the current Intel microcode data package go to
1097 <https://downloadcenter.intel.com> and search for
1098 'Linux Processor Microcode Data File'.
Peter Oruba8d86f392008-07-28 18:44:21 +02001099
Peter Oruba80cc9f12008-07-28 18:44:22 +02001100config MICROCODE_AMD
Borislav Petkove43f6e62012-08-01 19:17:01 +02001101 bool "AMD microcode loading support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001102 depends on MICROCODE
1103 select FW_LOADER
1104 ---help---
1105 If you select this option, microcode patch loading support for AMD
1106 processors will be enabled.
Peter Oruba80cc9f12008-07-28 18:44:22 +02001107
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001108config MICROCODE_OLD_INTERFACE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001109 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001110 depends on MICROCODE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001111
Fenghua Yuda76f642012-12-20 23:44:32 -08001112config MICROCODE_INTEL_EARLY
Jacob Shin757885e2013-05-30 14:09:19 -05001113 def_bool n
1114
1115config MICROCODE_AMD_EARLY
1116 def_bool n
1117
1118config MICROCODE_EARLY
Fenghua Yuda76f642012-12-20 23:44:32 -08001119 bool "Early load microcode"
Jacob Shin6b3389a2013-05-31 01:53:24 -05001120 depends on MICROCODE=y && BLK_DEV_INITRD
Jacob Shin757885e2013-05-30 14:09:19 -05001121 select MICROCODE_INTEL_EARLY if MICROCODE_INTEL
1122 select MICROCODE_AMD_EARLY if MICROCODE_AMD
Fenghua Yuda76f642012-12-20 23:44:32 -08001123 default y
1124 help
1125 This option provides functionality to read additional microcode data
1126 at the beginning of initrd image. The data tells kernel to load
1127 microcode to CPU's as early as possible. No functional change if no
1128 microcode data is glued to the initrd, therefore it's safe to say Y.
1129
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001130config X86_MSR
1131 tristate "/dev/cpu/*/msr - Model-specific register support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001132 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001133 This device gives privileged processes access to the x86
1134 Model-Specific Registers (MSRs). It is a character device with
1135 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
1136 MSR accesses are directed to a specific CPU on multi-processor
1137 systems.
1138
1139config X86_CPUID
1140 tristate "/dev/cpu/*/cpuid - CPU information support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001141 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001142 This device gives processes access to the x86 CPUID instruction to
1143 be executed on a specific processor. It is a character device
1144 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
1145 /dev/cpu/31/cpuid.
1146
1147choice
1148 prompt "High Memory Support"
Jan Beulich6fc108a2010-04-21 15:23:44 +01001149 default HIGHMEM4G
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001150 depends on X86_32
1151
1152config NOHIGHMEM
1153 bool "off"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001154 ---help---
1155 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
1156 However, the address space of 32-bit x86 processors is only 4
1157 Gigabytes large. That means that, if you have a large amount of
1158 physical memory, not all of it can be "permanently mapped" by the
1159 kernel. The physical memory that's not permanently mapped is called
1160 "high memory".
1161
1162 If you are compiling a kernel which will never run on a machine with
1163 more than 1 Gigabyte total physical RAM, answer "off" here (default
1164 choice and suitable for most users). This will result in a "3GB/1GB"
1165 split: 3GB are mapped so that each process sees a 3GB virtual memory
1166 space and the remaining part of the 4GB virtual memory space is used
1167 by the kernel to permanently map as much physical memory as
1168 possible.
1169
1170 If the machine has between 1 and 4 Gigabytes physical RAM, then
1171 answer "4GB" here.
1172
1173 If more than 4 Gigabytes is used then answer "64GB" here. This
1174 selection turns Intel PAE (Physical Address Extension) mode on.
1175 PAE implements 3-level paging on IA32 processors. PAE is fully
1176 supported by Linux, PAE mode is implemented on all recent Intel
1177 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
1178 then the kernel will not boot on CPUs that don't support PAE!
1179
1180 The actual amount of total physical memory will either be
1181 auto detected or can be forced by using a kernel command line option
1182 such as "mem=256M". (Try "man bootparam" or see the documentation of
1183 your boot loader (lilo or loadlin) about how to pass options to the
1184 kernel at boot time.)
1185
1186 If unsure, say "off".
1187
1188config HIGHMEM4G
1189 bool "4GB"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001190 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001191 Select this if you have a 32-bit processor and between 1 and 4
1192 gigabytes of physical RAM.
1193
1194config HIGHMEM64G
1195 bool "64GB"
H. Peter Anvineb068e72012-11-28 11:50:23 -08001196 depends on !M486
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001197 select X86_PAE
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001198 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001199 Select this if you have a 32-bit processor and more than 4
1200 gigabytes of physical RAM.
1201
1202endchoice
1203
1204choice
David Rientjes6a108a12011-01-20 14:44:16 -08001205 prompt "Memory split" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001206 default VMSPLIT_3G
1207 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001208 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001209 Select the desired split between kernel and user memory.
1210
1211 If the address range available to the kernel is less than the
1212 physical memory installed, the remaining memory will be available
1213 as "high memory". Accessing high memory is a little more costly
1214 than low memory, as it needs to be mapped into the kernel first.
1215 Note that increasing the kernel address space limits the range
1216 available to user programs, making the address space there
1217 tighter. Selecting anything other than the default 3G/1G split
1218 will also likely make your kernel incompatible with binary-only
1219 kernel modules.
1220
1221 If you are not absolutely sure what you are doing, leave this
1222 option alone!
1223
1224 config VMSPLIT_3G
1225 bool "3G/1G user/kernel split"
1226 config VMSPLIT_3G_OPT
1227 depends on !X86_PAE
1228 bool "3G/1G user/kernel split (for full 1G low memory)"
1229 config VMSPLIT_2G
1230 bool "2G/2G user/kernel split"
1231 config VMSPLIT_2G_OPT
1232 depends on !X86_PAE
1233 bool "2G/2G user/kernel split (for full 2G low memory)"
1234 config VMSPLIT_1G
1235 bool "1G/3G user/kernel split"
1236endchoice
1237
1238config PAGE_OFFSET
1239 hex
1240 default 0xB0000000 if VMSPLIT_3G_OPT
1241 default 0x80000000 if VMSPLIT_2G
1242 default 0x78000000 if VMSPLIT_2G_OPT
1243 default 0x40000000 if VMSPLIT_1G
1244 default 0xC0000000
1245 depends on X86_32
1246
1247config HIGHMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001248 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001249 depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001250
1251config X86_PAE
Jan Beulich9ba16082008-10-15 22:01:38 -07001252 bool "PAE (Physical Address Extension) Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001253 depends on X86_32 && !HIGHMEM4G
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001254 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001255 PAE is required for NX support, and furthermore enables
1256 larger swapspace support for non-overcommit purposes. It
1257 has the cost of more pagetable lookup overhead, and also
1258 consumes more pagetable space per process.
1259
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001260config ARCH_PHYS_ADDR_T_64BIT
Jan Beulich3120e252012-09-10 12:41:45 +01001261 def_bool y
1262 depends on X86_64 || X86_PAE
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001263
FUJITA Tomonori66f2b062010-10-20 15:55:35 -07001264config ARCH_DMA_ADDR_T_64BIT
Jan Beulich3120e252012-09-10 12:41:45 +01001265 def_bool y
1266 depends on X86_64 || HIGHMEM64G
FUJITA Tomonori66f2b062010-10-20 15:55:35 -07001267
Nick Piggin9e899812008-10-22 12:33:16 +02001268config DIRECT_GBPAGES
David Rientjes6a108a12011-01-20 14:44:16 -08001269 bool "Enable 1GB pages for kernel pagetables" if EXPERT
Nick Piggin9e899812008-10-22 12:33:16 +02001270 default y
1271 depends on X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001272 ---help---
Nick Piggin9e899812008-10-22 12:33:16 +02001273 Allow the kernel linear mapping to use 1GB pages on CPUs that
1274 support it. This can improve the kernel's performance a tiny bit by
1275 reducing TLB pressure. If in doubt, say "Y".
1276
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001277# Common NUMA Features
1278config NUMA
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001279 bool "Numa Memory Allocation and Scheduler Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001280 depends on SMP
H. Peter Anvinb5660ba2014-02-25 12:14:06 -08001281 depends on X86_64 || (X86_32 && HIGHMEM64G && X86_BIGSMP)
1282 default y if X86_BIGSMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001283 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001284 Enable NUMA (Non Uniform Memory Access) support.
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001285
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001286 The kernel will try to allocate memory used by a CPU on the
1287 local memory controller of the CPU and add some more
1288 NUMA awareness to the kernel.
1289
Ingo Molnarc280ea52008-11-08 13:29:45 +01001290 For 64-bit this is recommended if the system is Intel Core i7
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001291 (or later), AMD Opteron, or EM64T NUMA.
1292
H. Peter Anvinb5660ba2014-02-25 12:14:06 -08001293 For 32-bit this is only needed if you boot a 32-bit
David Rientjes7cf6c942014-02-11 18:11:13 -08001294 kernel on a 64-bit NUMA platform.
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001295
1296 Otherwise, you should say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001297
Hans Rosenfeldeec1d4f2010-10-29 17:14:30 +02001298config AMD_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001299 def_bool y
1300 prompt "Old style AMD Opteron NUMA detection"
Tejun Heo5da0ef92011-07-11 10:34:32 +02001301 depends on X86_64 && NUMA && PCI
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001302 ---help---
Hans Rosenfeldeec1d4f2010-10-29 17:14:30 +02001303 Enable AMD NUMA node topology detection. You should say Y here if
1304 you have a multi processor AMD system. This uses an old method to
1305 read the NUMA configuration directly from the builtin Northbridge
1306 of Opteron. It is recommended to use X86_64_ACPI_NUMA instead,
1307 which also takes priority if both are compiled in.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001308
1309config X86_64_ACPI_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001310 def_bool y
1311 prompt "ACPI NUMA detection"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001312 depends on X86_64 && NUMA && ACPI && PCI
1313 select ACPI_NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001314 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001315 Enable ACPI SRAT based node topology detection.
1316
Suresh Siddha6ec6e0d2008-03-25 10:14:35 -07001317# Some NUMA nodes have memory ranges that span
1318# other nodes. Even though a pfn is valid and
1319# between a node's start and end pfns, it may not
1320# reside on that node. See memmap_init_zone()
1321# for details.
1322config NODES_SPAN_OTHER_NODES
1323 def_bool y
1324 depends on X86_64_ACPI_NUMA
1325
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001326config NUMA_EMU
1327 bool "NUMA emulation"
Tejun Heo1b7e03e2011-05-02 17:24:48 +02001328 depends on NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001329 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001330 Enable NUMA emulation. A flat machine will be split
1331 into virtual nodes when booted with "numa=fake=N", where N is the
1332 number of nodes. This is only useful for debugging.
1333
1334config NODES_SHIFT
Linus Torvaldsd25e26b2008-08-25 14:15:38 -07001335 int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
David Rientjes51591e32010-03-25 15:39:27 -07001336 range 1 10
1337 default "10" if MAXSMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001338 default "6" if X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001339 default "3"
1340 depends on NEED_MULTIPLE_NODES
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001341 ---help---
Mike Travis1184dc22008-05-12 21:21:12 +02001342 Specify the maximum number of NUMA Nodes available on the target
Matt LaPlante692105b2009-01-26 11:12:25 +01001343 system. Increases memory reserved to accommodate various tables.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001344
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001345config ARCH_HAVE_MEMORY_PRESENT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001346 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001347 depends on X86_32 && DISCONTIGMEM
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001348
1349config NEED_NODE_MEMMAP_SIZE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001350 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001351 depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001352
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001353config ARCH_FLATMEM_ENABLE
1354 def_bool y
Tejun Heo3b166512011-04-01 11:15:12 +02001355 depends on X86_32 && !NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001356
1357config ARCH_DISCONTIGMEM_ENABLE
1358 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001359 depends on NUMA && X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001360
1361config ARCH_DISCONTIGMEM_DEFAULT
1362 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001363 depends on NUMA && X86_32
1364
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001365config ARCH_SPARSEMEM_ENABLE
1366 def_bool y
Kees Cook6ea30382012-10-02 11:16:47 -07001367 depends on X86_64 || NUMA || X86_32 || X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001368 select SPARSEMEM_STATIC if X86_32
1369 select SPARSEMEM_VMEMMAP_ENABLE if X86_64
1370
Tejun Heo3b166512011-04-01 11:15:12 +02001371config ARCH_SPARSEMEM_DEFAULT
1372 def_bool y
1373 depends on X86_64
1374
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001375config ARCH_SELECT_MEMORY_MODEL
1376 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001377 depends on ARCH_SPARSEMEM_ENABLE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001378
1379config ARCH_MEMORY_PROBE
Toshi Kania0842b72013-07-19 11:47:48 -06001380 bool "Enable sysfs memory/probe interface"
Jan Beulich3120e252012-09-10 12:41:45 +01001381 depends on X86_64 && MEMORY_HOTPLUG
Toshi Kania0842b72013-07-19 11:47:48 -06001382 help
1383 This option enables a sysfs memory/probe interface for testing.
1384 See Documentation/memory-hotplug.txt for more information.
1385 If you are unsure how to answer this question, answer N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001386
Tejun Heo3b166512011-04-01 11:15:12 +02001387config ARCH_PROC_KCORE_TEXT
1388 def_bool y
1389 depends on X86_64 && PROC_KCORE
1390
Avi Kivitya29815a2010-01-10 16:28:09 +02001391config ILLEGAL_POINTER_VALUE
1392 hex
1393 default 0 if X86_32
1394 default 0xdead000000000000 if X86_64
1395
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001396source "mm/Kconfig"
1397
1398config HIGHPTE
1399 bool "Allocate 3rd-level pagetables from highmem"
Jan Beulich6fc108a2010-04-21 15:23:44 +01001400 depends on HIGHMEM
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001401 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001402 The VM uses one page table entry for each page of physical memory.
1403 For systems with a lot of RAM, this can be wasteful of precious
1404 low memory. Setting this option will put user-space page table
1405 entries in high memory.
1406
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001407config X86_CHECK_BIOS_CORRUPTION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001408 bool "Check for low memory corruption"
1409 ---help---
1410 Periodically check for memory corruption in low memory, which
1411 is suspected to be caused by BIOS. Even when enabled in the
1412 configuration, it is disabled at runtime. Enable it by
1413 setting "memory_corruption_check=1" on the kernel command
1414 line. By default it scans the low 64k of memory every 60
1415 seconds; see the memory_corruption_check_size and
1416 memory_corruption_check_period parameters in
1417 Documentation/kernel-parameters.txt to adjust this.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001418
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001419 When enabled with the default parameters, this option has
1420 almost no overhead, as it reserves a relatively small amount
1421 of memory and scans it infrequently. It both detects corruption
1422 and prevents it from affecting the running system.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001423
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001424 It is, however, intended as a diagnostic tool; if repeatable
1425 BIOS-originated corruption always affects the same memory,
1426 you can use memmap= to prevent the kernel from using that
1427 memory.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001428
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001429config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001430 bool "Set the default setting of memory_corruption_check"
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001431 depends on X86_CHECK_BIOS_CORRUPTION
1432 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001433 ---help---
1434 Set whether the default state of memory_corruption_check is
1435 on or off.
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001436
H. Peter Anvin9ea77bd2010-08-25 16:38:20 -07001437config X86_RESERVE_LOW
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001438 int "Amount of low memory, in kilobytes, to reserve for the BIOS"
1439 default 64
1440 range 4 640
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001441 ---help---
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001442 Specify the amount of low memory to reserve for the BIOS.
Ingo Molnarfc381512008-09-16 10:07:34 +02001443
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001444 The first page contains BIOS data structures that the kernel
1445 must not use, so that page must always be reserved.
Ingo Molnarfc381512008-09-16 10:07:34 +02001446
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001447 By default we reserve the first 64K of physical RAM, as a
1448 number of BIOSes are known to corrupt that memory range
1449 during events such as suspend/resume or monitor cable
1450 insertion, so it must not be used by the kernel.
Ingo Molnarfc381512008-09-16 10:07:34 +02001451
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001452 You can set this to 4 if you are absolutely sure that you
1453 trust the BIOS to get all its memory reservations and usages
1454 right. If you know your BIOS have problems beyond the
1455 default 64K area, you can set this to 640 to avoid using the
1456 entire low memory range.
1457
1458 If you have doubts about the BIOS (e.g. suspend/resume does
1459 not work or there's kernel crashes after certain hardware
1460 hotplug events) then you might want to enable
1461 X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check
1462 typical corruption patterns.
1463
1464 Leave this to the default value of 64 if you are unsure.
Ingo Molnarfc381512008-09-16 10:07:34 +02001465
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001466config MATH_EMULATION
1467 bool
1468 prompt "Math emulation" if X86_32
1469 ---help---
1470 Linux can emulate a math coprocessor (used for floating point
1471 operations) if you don't have one. 486DX and Pentium processors have
1472 a math coprocessor built in, 486SX and 386 do not, unless you added
1473 a 487DX or 387, respectively. (The messages during boot time can
1474 give you some hints here ["man dmesg"].) Everyone needs either a
1475 coprocessor or this emulation.
1476
1477 If you don't have a math coprocessor, you need to say Y here; if you
1478 say Y here even though you have a coprocessor, the coprocessor will
1479 be used nevertheless. (This behavior can be changed with the kernel
1480 command line option "no387", which comes handy if your coprocessor
1481 is broken. Try "man bootparam" or see the documentation of your boot
1482 loader (lilo or loadlin) about how to pass options to the kernel at
1483 boot time.) This means that it is a good idea to say Y here if you
1484 intend to use this kernel on different machines.
1485
1486 More information about the internals of the Linux math coprocessor
1487 emulation can be found in <file:arch/x86/math-emu/README>.
1488
1489 If you are not sure, say Y; apart from resulting in a 66 KB bigger
1490 kernel, it won't hurt.
1491
1492config MTRR
Jan Beulich6fc108a2010-04-21 15:23:44 +01001493 def_bool y
David Rientjes6a108a12011-01-20 14:44:16 -08001494 prompt "MTRR (Memory Type Range Register) support" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001495 ---help---
1496 On Intel P6 family processors (Pentium Pro, Pentium II and later)
1497 the Memory Type Range Registers (MTRRs) may be used to control
1498 processor access to memory ranges. This is most useful if you have
1499 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
1500 allows bus write transfers to be combined into a larger transfer
1501 before bursting over the PCI/AGP bus. This can increase performance
1502 of image write operations 2.5 times or more. Saying Y here creates a
1503 /proc/mtrr file which may be used to manipulate your processor's
1504 MTRRs. Typically the X server should use this.
1505
1506 This code has a reasonably generic interface so that similar
1507 control registers on other processors can be easily supported
1508 as well:
1509
1510 The Cyrix 6x86, 6x86MX and M II processors have Address Range
1511 Registers (ARRs) which provide a similar functionality to MTRRs. For
1512 these, the ARRs are used to emulate the MTRRs.
1513 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
1514 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
1515 write-combining. All of these processors are supported by this code
1516 and it makes sense to say Y here if you have one of them.
1517
1518 Saying Y here also fixes a problem with buggy SMP BIOSes which only
1519 set the MTRRs for the boot CPU and not for the secondary CPUs. This
1520 can lead to all sorts of problems, so it's good to say Y here.
1521
1522 You can safely say Y even if your machine doesn't have MTRRs, you'll
1523 just add about 9 KB to your kernel.
1524
Randy Dunlap7225e752008-07-26 17:54:22 -07001525 See <file:Documentation/x86/mtrr.txt> for more information.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001526
Yinghai Lu95ffa242008-04-29 03:52:33 -07001527config MTRR_SANITIZER
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001528 def_bool y
Yinghai Lu95ffa242008-04-29 03:52:33 -07001529 prompt "MTRR cleanup support"
1530 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001531 ---help---
Thomas Gleixneraba37282008-07-15 14:48:48 +02001532 Convert MTRR layout from continuous to discrete, so X drivers can
1533 add writeback entries.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001534
Thomas Gleixneraba37282008-07-15 14:48:48 +02001535 Can be disabled with disable_mtrr_cleanup on the kernel command line.
Matt LaPlante692105b2009-01-26 11:12:25 +01001536 The largest mtrr entry size for a continuous block can be set with
Thomas Gleixneraba37282008-07-15 14:48:48 +02001537 mtrr_chunk_size.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001538
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001539 If unsure, say Y.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001540
1541config MTRR_SANITIZER_ENABLE_DEFAULT
Yinghai Luf5098d62008-04-29 20:25:58 -07001542 int "MTRR cleanup enable value (0-1)"
1543 range 0 1
1544 default "0"
Yinghai Lu95ffa242008-04-29 03:52:33 -07001545 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001546 ---help---
Yinghai Luf5098d62008-04-29 20:25:58 -07001547 Enable mtrr cleanup default value
Yinghai Lu95ffa242008-04-29 03:52:33 -07001548
Yinghai Lu12031a62008-05-02 02:40:22 -07001549config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
1550 int "MTRR cleanup spare reg num (0-7)"
1551 range 0 7
1552 default "1"
1553 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001554 ---help---
Yinghai Lu12031a62008-05-02 02:40:22 -07001555 mtrr cleanup spare entries default, it can be changed via
Thomas Gleixneraba37282008-07-15 14:48:48 +02001556 mtrr_spare_reg_nr=N on the kernel command line.
Yinghai Lu12031a62008-05-02 02:40:22 -07001557
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001558config X86_PAT
Jan Beulich6fc108a2010-04-21 15:23:44 +01001559 def_bool y
David Rientjes6a108a12011-01-20 14:44:16 -08001560 prompt "x86 PAT support" if EXPERT
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001561 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001562 ---help---
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001563 Use PAT attributes to setup page level cache control.
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001564
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001565 PATs are the modern equivalents of MTRRs and are much more
1566 flexible than MTRRs.
1567
1568 Say N here if you see bootup problems (boot crash, boot hang,
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001569 spontaneous reboots) or a non-working video driver.
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001570
1571 If unsure, say Y.
1572
Venkatesh Pallipadi46cf98c2009-07-10 09:57:37 -07001573config ARCH_USES_PG_UNCACHED
1574 def_bool y
1575 depends on X86_PAT
1576
H. Peter Anvin628c6242011-07-31 13:59:29 -07001577config ARCH_RANDOM
1578 def_bool y
1579 prompt "x86 architectural random number generator" if EXPERT
1580 ---help---
1581 Enable the x86 architectural RDRAND instruction
1582 (Intel Bull Mountain technology) to generate random numbers.
1583 If supported, this is a high bandwidth, cryptographically
1584 secure hardware random number generator.
1585
H. Peter Anvin51ae4a22012-09-21 12:43:10 -07001586config X86_SMAP
1587 def_bool y
1588 prompt "Supervisor Mode Access Prevention" if EXPERT
1589 ---help---
1590 Supervisor Mode Access Prevention (SMAP) is a security
1591 feature in newer Intel processors. There is a small
1592 performance cost if this enabled and turned on; there is
1593 also a small increase in the kernel size if this is enabled.
1594
1595 If unsure, say Y.
1596
Dave Hansen72e9b5f2014-12-12 10:38:36 -08001597config X86_INTEL_MPX
1598 prompt "Intel MPX (Memory Protection Extensions)"
1599 def_bool n
1600 depends on CPU_SUP_INTEL
1601 ---help---
1602 MPX provides hardware features that can be used in
1603 conjunction with compiler-instrumented code to check
1604 memory references. It is designed to detect buffer
1605 overflow or underflow bugs.
1606
1607 This option enables running applications which are
1608 instrumented or otherwise use MPX. It does not use MPX
1609 itself inside the kernel or to protect the kernel
1610 against bad memory references.
1611
1612 Enabling this option will make the kernel larger:
1613 ~8k of kernel text and 36 bytes of data on a 64-bit
1614 defconfig. It adds a long to the 'mm_struct' which
1615 will increase the kernel memory overhead of each
1616 process and adds some branches to paths used during
1617 exec() and munmap().
1618
1619 For details, see Documentation/x86/intel_mpx.txt
1620
1621 If unsure, say N.
1622
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001623config EFI
Jan Beulich9ba16082008-10-15 22:01:38 -07001624 bool "EFI runtime service support"
Huang, Ying5b836832008-01-30 13:31:19 +01001625 depends on ACPI
Sergey Vlasovf6ce5002013-04-16 18:31:08 +04001626 select UCS2_STRING
Ard Biesheuvel022ee6c2014-06-26 12:09:05 +02001627 select EFI_RUNTIME_WRAPPERS
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001628 ---help---
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001629 This enables the kernel to use EFI runtime services that are
1630 available (such as the EFI variable services).
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001631
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001632 This option is only useful on systems that have EFI firmware.
1633 In addition, you should use the latest ELILO loader available
1634 at <http://elilo.sourceforge.net> in order to take advantage
1635 of EFI runtime services. However, even with this option, the
1636 resultant kernel should continue to boot on existing non-EFI
1637 platforms.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001638
Matt Fleming291f3632011-12-12 21:27:52 +00001639config EFI_STUB
1640 bool "EFI stub support"
Matt Flemingb16d8c22014-08-05 00:12:19 +01001641 depends on EFI && !X86_USE_3DNOW
Matt Fleming7b2a5832014-07-11 08:45:25 +01001642 select RELOCATABLE
Matt Fleming291f3632011-12-12 21:27:52 +00001643 ---help---
1644 This kernel feature allows a bzImage to be loaded directly
1645 by EFI firmware without the use of a bootloader.
1646
Roy Franz4172fe22013-09-22 15:45:25 -07001647 See Documentation/efi-stub.txt for more information.
Matt Fleming0c759662012-03-16 12:03:13 +00001648
Matt Fleming7d453ee2014-01-10 18:52:06 +00001649config EFI_MIXED
1650 bool "EFI mixed-mode support"
1651 depends on EFI_STUB && X86_64
1652 ---help---
1653 Enabling this feature allows a 64-bit kernel to be booted
1654 on a 32-bit firmware, provided that your CPU supports 64-bit
1655 mode.
1656
1657 Note that it is not possible to boot a mixed-mode enabled
1658 kernel via the EFI boot stub - a bootloader that supports
1659 the EFI handover protocol must be used.
1660
1661 If unsure, say N.
1662
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001663config SECCOMP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001664 def_bool y
1665 prompt "Enable seccomp to safely compute untrusted bytecode"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001666 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001667 This kernel feature is useful for number crunching applications
1668 that may need to compute untrusted bytecode during their
1669 execution. By using pipes or other transports made available to
1670 the process as file descriptors supporting the read/write
1671 syscalls, it's possible to isolate those applications in
1672 their own address space using seccomp. Once seccomp is
Alexey Dobriyan9c0bbee2008-09-09 11:01:31 +04001673 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001674 and the task is only allowed to execute a few safe syscalls
1675 defined by each seccomp mode.
1676
1677 If unsure, say Y. Only embedded should say N here.
1678
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001679source kernel/Kconfig.hz
1680
1681config KEXEC
1682 bool "kexec system call"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001683 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001684 kexec is a system call that implements the ability to shutdown your
1685 current kernel, and to start another kernel. It is like a reboot
1686 but it is independent of the system firmware. And like a reboot
1687 you can start any kernel with it, not just Linux.
1688
1689 The name comes from the similarity to the exec system call.
1690
1691 It is an ongoing process to be certain the hardware in a machine
1692 is properly shutdown, so do not be surprised if this code does not
Geert Uytterhoevenbf220692013-08-20 21:38:03 +02001693 initially work for you. As of this writing the exact hardware
1694 interface is strongly in flux, so no good recommendation can be
1695 made.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001696
Vivek Goyal74ca3172014-08-29 15:18:46 -07001697config KEXEC_FILE
1698 bool "kexec file based system call"
1699 select BUILD_BIN2C
1700 depends on KEXEC
1701 depends on X86_64
1702 depends on CRYPTO=y
1703 depends on CRYPTO_SHA256=y
1704 ---help---
1705 This is new version of kexec system call. This system call is
1706 file based and takes file descriptors as system call argument
1707 for kernel and initramfs as opposed to list of segments as
1708 accepted by previous system call.
1709
Vivek Goyal8e7d8382014-08-08 14:26:13 -07001710config KEXEC_VERIFY_SIG
1711 bool "Verify kernel signature during kexec_file_load() syscall"
Vivek Goyal74ca3172014-08-29 15:18:46 -07001712 depends on KEXEC_FILE
Vivek Goyal8e7d8382014-08-08 14:26:13 -07001713 ---help---
1714 This option makes kernel signature verification mandatory for
1715 kexec_file_load() syscall. If kernel is signature can not be
1716 verified, kexec_file_load() will fail.
1717
1718 This option enforces signature verification at generic level.
1719 One needs to enable signature verification for type of kernel
1720 image being loaded to make sure it works. For example, enable
1721 bzImage signature verification option to be able to load and
1722 verify signatures of bzImage. Otherwise kernel loading will fail.
1723
1724config KEXEC_BZIMAGE_VERIFY_SIG
1725 bool "Enable bzImage signature verification support"
1726 depends on KEXEC_VERIFY_SIG
1727 depends on SIGNED_PE_FILE_VERIFICATION
1728 select SYSTEM_TRUSTED_KEYRING
1729 ---help---
1730 Enable bzImage signature verification support.
1731
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001732config CRASH_DUMP
Pavel Machek04b69442008-08-14 17:16:50 +02001733 bool "kernel crash dumps"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001734 depends on X86_64 || (X86_32 && HIGHMEM)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001735 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001736 Generate crash dump after being started by kexec.
1737 This should be normally only set in special crash dump kernels
1738 which are loaded in the main kernel with kexec-tools into
1739 a specially reserved region and then later executed after
1740 a crash by kdump/kexec. The crash dump kernel must be compiled
1741 to a memory address not used by the main kernel or BIOS using
1742 PHYSICAL_START, or it must be built as a relocatable image
1743 (CONFIG_RELOCATABLE=y).
1744 For more details see Documentation/kdump/kdump.txt
1745
Huang Ying3ab83522008-07-25 19:45:07 -07001746config KEXEC_JUMP
Kees Cook6ea30382012-10-02 11:16:47 -07001747 bool "kexec jump"
Huang Yingfee7b0d2009-03-10 10:57:16 +08001748 depends on KEXEC && HIBERNATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001749 ---help---
Huang Ying89081d12008-07-25 19:45:10 -07001750 Jump between original kernel and kexeced kernel and invoke
1751 code in physical address mode via KEXEC
Huang Ying3ab83522008-07-25 19:45:07 -07001752
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001753config PHYSICAL_START
David Rientjes6a108a12011-01-20 14:44:16 -08001754 hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP)
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001755 default "0x1000000"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001756 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001757 This gives the physical address where the kernel is loaded.
1758
1759 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
1760 bzImage will decompress itself to above physical address and
1761 run from there. Otherwise, bzImage will run from the address where
1762 it has been loaded by the boot loader and will ignore above physical
1763 address.
1764
1765 In normal kdump cases one does not have to set/change this option
1766 as now bzImage can be compiled as a completely relocatable image
1767 (CONFIG_RELOCATABLE=y) and be used to load and run from a different
1768 address. This option is mainly useful for the folks who don't want
1769 to use a bzImage for capturing the crash dump and want to use a
1770 vmlinux instead. vmlinux is not relocatable hence a kernel needs
1771 to be specifically compiled to run from a specific memory area
1772 (normally a reserved region) and this option comes handy.
1773
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001774 So if you are using bzImage for capturing the crash dump,
1775 leave the value here unchanged to 0x1000000 and set
1776 CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux
1777 for capturing the crash dump change this value to start of
1778 the reserved region. In other words, it can be set based on
1779 the "X" value as specified in the "crashkernel=YM@XM"
1780 command line boot parameter passed to the panic-ed
1781 kernel. Please take a look at Documentation/kdump/kdump.txt
1782 for more details about crash dumps.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001783
1784 Usage of bzImage for capturing the crash dump is recommended as
1785 one does not have to build two kernels. Same kernel can be used
1786 as production kernel and capture kernel. Above option should have
1787 gone away after relocatable bzImage support is introduced. But it
1788 is present because there are users out there who continue to use
1789 vmlinux for dump capture. This option should go away down the
1790 line.
1791
1792 Don't change this unless you know what you are doing.
1793
1794config RELOCATABLE
H. Peter Anvin26717802009-05-07 14:19:34 -07001795 bool "Build a relocatable kernel"
1796 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001797 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001798 This builds a kernel image that retains relocation information
1799 so it can be loaded someplace besides the default 1MB.
1800 The relocations tend to make the kernel binary about 10% larger,
1801 but are discarded at runtime.
1802
1803 One use is for the kexec on panic case where the recovery kernel
1804 must live at a different physical address than the primary
1805 kernel.
1806
1807 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
1808 it has been loaded at and the compile time physical address
Kees Cook8ab38202013-10-10 17:18:14 -07001809 (CONFIG_PHYSICAL_START) is used as the minimum location.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001810
Kees Cook8ab38202013-10-10 17:18:14 -07001811config RANDOMIZE_BASE
1812 bool "Randomize the address of the kernel image"
1813 depends on RELOCATABLE
Kees Cook8ab38202013-10-10 17:18:14 -07001814 default n
1815 ---help---
1816 Randomizes the physical and virtual address at which the
1817 kernel image is decompressed, as a security feature that
1818 deters exploit attempts relying on knowledge of the location
1819 of kernel internals.
1820
Kees Cooka653f352013-11-11 14:28:39 -08001821 Entropy is generated using the RDRAND instruction if it is
1822 supported. If RDTSC is supported, it is used as well. If
1823 neither RDRAND nor RDTSC are supported, then randomness is
1824 read from the i8254 timer.
Kees Cook8ab38202013-10-10 17:18:14 -07001825
1826 The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET,
Kees Cooka653f352013-11-11 14:28:39 -08001827 and aligned according to PHYSICAL_ALIGN. Since the kernel is
1828 built using 2GiB addressing, and PHYSICAL_ALGIN must be at a
1829 minimum of 2MiB, only 10 bits of entropy is theoretically
1830 possible. At best, due to page table layouts, 64-bit can use
1831 9 bits of entropy and 32-bit uses 8 bits.
Kees Cook8ab38202013-10-10 17:18:14 -07001832
Kees Cookda2b6fb2013-12-10 12:27:45 -08001833 If unsure, say N.
1834
Kees Cook8ab38202013-10-10 17:18:14 -07001835config RANDOMIZE_BASE_MAX_OFFSET
Kees Cookda2b6fb2013-12-10 12:27:45 -08001836 hex "Maximum kASLR offset allowed" if EXPERT
Kees Cook8ab38202013-10-10 17:18:14 -07001837 depends on RANDOMIZE_BASE
Kees Cook6145cfe2013-10-10 17:18:18 -07001838 range 0x0 0x20000000 if X86_32
1839 default "0x20000000" if X86_32
1840 range 0x0 0x40000000 if X86_64
1841 default "0x40000000" if X86_64
Kees Cook8ab38202013-10-10 17:18:14 -07001842 ---help---
Kees Cookda2b6fb2013-12-10 12:27:45 -08001843 The lesser of RANDOMIZE_BASE_MAX_OFFSET and available physical
1844 memory is used to determine the maximal offset in bytes that will
1845 be applied to the kernel when kernel Address Space Layout
1846 Randomization (kASLR) is active. This must be a multiple of
1847 PHYSICAL_ALIGN.
Kees Cook6145cfe2013-10-10 17:18:18 -07001848
Kees Cookda2b6fb2013-12-10 12:27:45 -08001849 On 32-bit this is limited to 512MiB by page table layouts. The
1850 default is 512MiB.
Kees Cook6145cfe2013-10-10 17:18:18 -07001851
Kees Cookda2b6fb2013-12-10 12:27:45 -08001852 On 64-bit this is limited by how the kernel fixmap page table is
1853 positioned, so this cannot be larger than 1GiB currently. Without
1854 RANDOMIZE_BASE, there is a 512MiB to 1.5GiB split between kernel
1855 and modules. When RANDOMIZE_BASE_MAX_OFFSET is above 512MiB, the
1856 modules area will shrink to compensate, up to the current maximum
1857 1GiB to 1GiB split. The default is 1GiB.
1858
1859 If unsure, leave at the default value.
Kees Cook8ab38202013-10-10 17:18:14 -07001860
1861# Relocation on x86 needs some additional build support
H. Peter Anvin845adf72009-05-05 21:20:51 -07001862config X86_NEED_RELOCS
1863 def_bool y
Kees Cook8ab38202013-10-10 17:18:14 -07001864 depends on RANDOMIZE_BASE || (X86_32 && RELOCATABLE)
H. Peter Anvin845adf72009-05-05 21:20:51 -07001865
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001866config PHYSICAL_ALIGN
Kees Cooka0215062013-07-08 09:15:17 -07001867 hex "Alignment value to which kernel should be aligned"
Kees Cook8ab38202013-10-10 17:18:14 -07001868 default "0x200000"
Kees Cooka0215062013-07-08 09:15:17 -07001869 range 0x2000 0x1000000 if X86_32
1870 range 0x200000 0x1000000 if X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001871 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001872 This value puts the alignment restrictions on physical address
1873 where kernel is loaded and run from. Kernel is compiled for an
1874 address which meets above alignment restriction.
1875
1876 If bootloader loads the kernel at a non-aligned address and
1877 CONFIG_RELOCATABLE is set, kernel will move itself to nearest
1878 address aligned to above value and run from there.
1879
1880 If bootloader loads the kernel at a non-aligned address and
1881 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
1882 load address and decompress itself to the address it has been
1883 compiled for and run from there. The address for which kernel is
1884 compiled already meets above alignment restrictions. Hence the
1885 end result is that kernel runs from a physical address meeting
1886 above alignment restrictions.
1887
Kees Cooka0215062013-07-08 09:15:17 -07001888 On 32-bit this value must be a multiple of 0x2000. On 64-bit
1889 this value must be a multiple of 0x200000.
1890
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001891 Don't change this unless you know what you are doing.
1892
1893config HOTPLUG_CPU
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001894 bool "Support for hot-pluggable CPUs"
Stephen Rothwell40b31362013-05-21 13:49:35 +10001895 depends on SMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001896 ---help---
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001897 Say Y here to allow turning CPUs off and on. CPUs can be
1898 controlled through /sys/devices/system/cpu.
1899 ( Note: power management support will enable this option
1900 automatically on SMP systems. )
1901 Say N if you want to disable CPU hotplug.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001902
Fenghua Yu80aa1df2012-11-13 11:32:39 -08001903config BOOTPARAM_HOTPLUG_CPU0
1904 bool "Set default setting of cpu0_hotpluggable"
1905 default n
Kees Cook2c922cd2013-01-22 13:01:19 -08001906 depends on HOTPLUG_CPU
Fenghua Yu80aa1df2012-11-13 11:32:39 -08001907 ---help---
1908 Set whether default state of cpu0_hotpluggable is on or off.
1909
1910 Say Y here to enable CPU0 hotplug by default. If this switch
1911 is turned on, there is no need to give cpu0_hotplug kernel
1912 parameter and the CPU0 hotplug feature is enabled by default.
1913
1914 Please note: there are two known CPU0 dependencies if you want
1915 to enable the CPU0 hotplug feature either by this switch or by
1916 cpu0_hotplug kernel parameter.
1917
1918 First, resume from hibernate or suspend always starts from CPU0.
1919 So hibernate and suspend are prevented if CPU0 is offline.
1920
1921 Second dependency is PIC interrupts always go to CPU0. CPU0 can not
1922 offline if any interrupt can not migrate out of CPU0. There may
1923 be other CPU0 dependencies.
1924
1925 Please make sure the dependencies are under your control before
1926 you enable this feature.
1927
1928 Say N if you don't want to enable CPU0 hotplug feature by default.
1929 You still can enable the CPU0 hotplug feature at boot by kernel
1930 parameter cpu0_hotplug.
1931
Fenghua Yua71c8bc2012-11-13 11:32:51 -08001932config DEBUG_HOTPLUG_CPU0
1933 def_bool n
1934 prompt "Debug CPU0 hotplug"
Kees Cook2c922cd2013-01-22 13:01:19 -08001935 depends on HOTPLUG_CPU
Fenghua Yua71c8bc2012-11-13 11:32:51 -08001936 ---help---
1937 Enabling this option offlines CPU0 (if CPU0 can be offlined) as
1938 soon as possible and boots up userspace with CPU0 offlined. User
1939 can online CPU0 back after boot time.
1940
1941 To debug CPU0 hotplug, you need to enable CPU0 offline/online
1942 feature by either turning on CONFIG_BOOTPARAM_HOTPLUG_CPU0 during
1943 compilation or giving cpu0_hotplug kernel parameter at boot.
1944
1945 If unsure, say N.
1946
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001947config COMPAT_VDSO
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07001948 def_bool n
1949 prompt "Disable the 32-bit vDSO (needed for glibc 2.3.3)"
Roland McGrathaf65d642008-01-30 13:30:43 +01001950 depends on X86_32 || IA32_EMULATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001951 ---help---
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07001952 Certain buggy versions of glibc will crash if they are
1953 presented with a 32-bit vDSO that is not mapped at the address
1954 indicated in its segment table.
Randy Dunlape84446d2009-11-10 15:46:52 -08001955
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07001956 The bug was introduced by f866314b89d56845f55e6f365e18b31ec978ec3a
1957 and fixed by 3b3ddb4f7db98ec9e912ccdf54d35df4aa30e04a and
1958 49ad572a70b8aeb91e57483a11dd1b77e31c4468. Glibc 2.3.3 is
1959 the only released version with the bug, but OpenSUSE 9
1960 contains a buggy "glibc 2.3.2".
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001961
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07001962 The symptom of the bug is that everything crashes on startup, saying:
1963 dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed!
1964
1965 Saying Y here changes the default value of the vdso32 boot
1966 option from 1 to 0, which turns off the 32-bit vDSO entirely.
1967 This works around the glibc bug but hurts performance.
1968
1969 If unsure, say N: if you are compiling your own kernel, you
1970 are unlikely to be using a buggy version of glibc.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001971
Tim Bird516cbf32008-08-12 12:52:36 -07001972config CMDLINE_BOOL
1973 bool "Built-in kernel command line"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001974 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001975 Allow for specifying boot arguments to the kernel at
1976 build time. On some systems (e.g. embedded ones), it is
1977 necessary or convenient to provide some or all of the
1978 kernel boot arguments with the kernel itself (that is,
1979 to not rely on the boot loader to provide them.)
1980
1981 To compile command line arguments into the kernel,
1982 set this option to 'Y', then fill in the
1983 the boot arguments in CONFIG_CMDLINE.
1984
1985 Systems with fully functional boot loaders (i.e. non-embedded)
1986 should leave this option set to 'N'.
1987
1988config CMDLINE
1989 string "Built-in kernel command string"
1990 depends on CMDLINE_BOOL
1991 default ""
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001992 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001993 Enter arguments here that should be compiled into the kernel
1994 image and used at boot time. If the boot loader provides a
1995 command line at boot time, it is appended to this string to
1996 form the full kernel command line, when the system boots.
1997
1998 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
1999 change this behavior.
2000
2001 In most cases, the command line (whether built-in or provided
2002 by the boot loader) should specify the device for the root
2003 file system.
2004
2005config CMDLINE_OVERRIDE
2006 bool "Built-in command line overrides boot loader arguments"
Tim Bird516cbf32008-08-12 12:52:36 -07002007 depends on CMDLINE_BOOL
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002008 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07002009 Set this option to 'Y' to have the kernel ignore the boot loader
2010 command line, and use ONLY the built-in command line.
2011
2012 This is used to work around broken boot loaders. This should
2013 be set to 'N' under normal conditions.
2014
Sam Ravnborg506f1d02007-11-09 21:56:54 +01002015endmenu
2016
2017config ARCH_ENABLE_MEMORY_HOTPLUG
2018 def_bool y
2019 depends on X86_64 || (X86_32 && HIGHMEM)
2020
Gary Hade35551052008-10-31 10:52:03 -07002021config ARCH_ENABLE_MEMORY_HOTREMOVE
2022 def_bool y
2023 depends on MEMORY_HOTPLUG
2024
Lee Schermerhorne534c7c2010-05-26 14:44:58 -07002025config USE_PERCPU_NUMA_NODE_ID
Tejun Heo645a7912011-01-23 14:37:40 +01002026 def_bool y
Lee Schermerhorne534c7c2010-05-26 14:44:58 -07002027 depends on NUMA
2028
Kirill A. Shutemov94918462013-11-14 14:31:10 -08002029config ARCH_ENABLE_SPLIT_PMD_PTLOCK
2030 def_bool y
2031 depends on X86_64 || X86_PAE
2032
Naoya Horiguchic177c812014-06-04 16:05:35 -07002033config ARCH_ENABLE_HUGEPAGE_MIGRATION
2034 def_bool y
2035 depends on X86_64 && HUGETLB_PAGE && MIGRATION
2036
Bjorn Helgaasda85f862008-11-05 13:37:27 -06002037menu "Power management and ACPI options"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002038
2039config ARCH_HIBERNATION_HEADER
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002040 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002041 depends on X86_64 && HIBERNATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002042
2043source "kernel/power/Kconfig"
2044
2045source "drivers/acpi/Kconfig"
2046
Feng Tangefafc8b2009-08-14 15:23:29 -04002047source "drivers/sfi/Kconfig"
2048
Andi Kleena6b68072008-01-30 13:32:49 +01002049config X86_APM_BOOT
Jan Beulich6fc108a2010-04-21 15:23:44 +01002050 def_bool y
Paul Bolle282e5aa2011-11-17 11:41:31 +01002051 depends on APM
Andi Kleena6b68072008-01-30 13:32:49 +01002052
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002053menuconfig APM
2054 tristate "APM (Advanced Power Management) BIOS support"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02002055 depends on X86_32 && PM_SLEEP
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002056 ---help---
2057 APM is a BIOS specification for saving power using several different
2058 techniques. This is mostly useful for battery powered laptops with
2059 APM compliant BIOSes. If you say Y here, the system time will be
2060 reset after a RESUME operation, the /proc/apm device will provide
2061 battery status information, and user-space programs will receive
2062 notification of APM "events" (e.g. battery status change).
2063
2064 If you select "Y" here, you can disable actual use of the APM
2065 BIOS by passing the "apm=off" option to the kernel at boot time.
2066
2067 Note that the APM support is almost completely disabled for
2068 machines with more than one CPU.
2069
2070 In order to use APM, you will need supporting software. For location
Michael Witten2dc98fd2011-07-08 21:11:16 +00002071 and more information, read <file:Documentation/power/apm-acpi.txt>
2072 and the Battery Powered Linux mini-HOWTO, available from
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002073 <http://www.tldp.org/docs.html#howto>.
2074
2075 This driver does not spin down disk drives (see the hdparm(8)
2076 manpage ("man 8 hdparm") for that), and it doesn't turn off
2077 VESA-compliant "green" monitors.
2078
2079 This driver does not support the TI 4000M TravelMate and the ACER
2080 486/DX4/75 because they don't have compliant BIOSes. Many "green"
2081 desktop machines also don't have compliant BIOSes, and this driver
2082 may cause those machines to panic during the boot phase.
2083
2084 Generally, if you don't have a battery in your machine, there isn't
2085 much point in using this driver and you should say N. If you get
2086 random kernel OOPSes or reboots that don't seem to be related to
2087 anything, try disabling/enabling this option (or disabling/enabling
2088 APM in your BIOS).
2089
2090 Some other things you should try when experiencing seemingly random,
2091 "weird" problems:
2092
2093 1) make sure that you have enough swap space and that it is
2094 enabled.
2095 2) pass the "no-hlt" option to the kernel
2096 3) switch on floating point emulation in the kernel and pass
2097 the "no387" option to the kernel
2098 4) pass the "floppy=nodma" option to the kernel
2099 5) pass the "mem=4M" option to the kernel (thereby disabling
2100 all but the first 4 MB of RAM)
2101 6) make sure that the CPU is not over clocked.
2102 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
2103 8) disable the cache from your BIOS settings
2104 9) install a fan for the video card or exchange video RAM
2105 10) install a better fan for the CPU
2106 11) exchange RAM chips
2107 12) exchange the motherboard.
2108
2109 To compile this driver as a module, choose M here: the
2110 module will be called apm.
2111
2112if APM
2113
2114config APM_IGNORE_USER_SUSPEND
2115 bool "Ignore USER SUSPEND"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002116 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002117 This option will ignore USER SUSPEND requests. On machines with a
2118 compliant APM BIOS, you want to say N. However, on the NEC Versa M
2119 series notebooks, it is necessary to say Y because of a BIOS bug.
2120
2121config APM_DO_ENABLE
2122 bool "Enable PM at boot time"
2123 ---help---
2124 Enable APM features at boot time. From page 36 of the APM BIOS
2125 specification: "When disabled, the APM BIOS does not automatically
2126 power manage devices, enter the Standby State, enter the Suspend
2127 State, or take power saving steps in response to CPU Idle calls."
2128 This driver will make CPU Idle calls when Linux is idle (unless this
2129 feature is turned off -- see "Do CPU IDLE calls", below). This
2130 should always save battery power, but more complicated APM features
2131 will be dependent on your BIOS implementation. You may need to turn
2132 this option off if your computer hangs at boot time when using APM
2133 support, or if it beeps continuously instead of suspending. Turn
2134 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
2135 T400CDT. This is off by default since most machines do fine without
2136 this feature.
2137
2138config APM_CPU_IDLE
Len Browndd8af072013-02-09 21:10:04 -05002139 depends on CPU_IDLE
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002140 bool "Make CPU Idle calls when idle"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002141 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002142 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
2143 On some machines, this can activate improved power savings, such as
2144 a slowed CPU clock rate, when the machine is idle. These idle calls
2145 are made after the idle loop has run for some length of time (e.g.,
2146 333 mS). On some machines, this will cause a hang at boot time or
2147 whenever the CPU becomes idle. (On machines with more than one CPU,
2148 this option does nothing.)
2149
2150config APM_DISPLAY_BLANK
2151 bool "Enable console blanking using APM"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002152 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002153 Enable console blanking using the APM. Some laptops can use this to
2154 turn off the LCD backlight when the screen blanker of the Linux
2155 virtual console blanks the screen. Note that this is only used by
2156 the virtual console screen blanker, and won't turn off the backlight
2157 when using the X Window system. This also doesn't have anything to
2158 do with your VESA-compliant power-saving monitor. Further, this
2159 option doesn't work for all laptops -- it might not turn off your
2160 backlight at all, or it might print a lot of errors to the console,
2161 especially if you are using gpm.
2162
2163config APM_ALLOW_INTS
2164 bool "Allow interrupts during APM BIOS calls"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002165 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002166 Normally we disable external interrupts while we are making calls to
2167 the APM BIOS as a measure to lessen the effects of a badly behaving
2168 BIOS implementation. The BIOS should reenable interrupts if it
2169 needs to. Unfortunately, some BIOSes do not -- especially those in
2170 many of the newer IBM Thinkpads. If you experience hangs when you
2171 suspend, try setting this to Y. Otherwise, say N.
2172
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002173endif # APM
2174
Dave Jonesbb0a56e2011-05-19 18:51:07 -04002175source "drivers/cpufreq/Kconfig"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002176
2177source "drivers/cpuidle/Kconfig"
2178
Andy Henroid27471fd2008-10-09 11:45:22 -07002179source "drivers/idle/Kconfig"
2180
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002181endmenu
2182
2183
2184menu "Bus options (PCI etc.)"
2185
2186config PCI
Ingo Molnar1ac97012008-05-19 14:10:14 +02002187 bool "PCI support"
Adrian Bunk1c858082008-01-30 13:32:32 +01002188 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002189 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002190 Find out whether you have a PCI motherboard. PCI is the name of a
2191 bus system, i.e. the way the CPU talks to the other stuff inside
2192 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
2193 VESA. If you have PCI, say Y, otherwise N.
2194
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002195choice
2196 prompt "PCI access mode"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02002197 depends on X86_32 && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002198 default PCI_GOANY
2199 ---help---
2200 On PCI systems, the BIOS can be used to detect the PCI devices and
2201 determine their configuration. However, some old PCI motherboards
2202 have BIOS bugs and may crash if this is done. Also, some embedded
2203 PCI-based systems don't have any BIOS at all. Linux can also try to
2204 detect the PCI hardware directly without using the BIOS.
2205
2206 With this option, you can specify how Linux should detect the
2207 PCI devices. If you choose "BIOS", the BIOS will be used,
2208 if you choose "Direct", the BIOS won't be used, and if you
2209 choose "MMConfig", then PCI Express MMCONFIG will be used.
2210 If you choose "Any", the kernel will try MMCONFIG, then the
2211 direct access method and falls back to the BIOS if that doesn't
2212 work. If unsure, go with the default, which is "Any".
2213
2214config PCI_GOBIOS
2215 bool "BIOS"
2216
2217config PCI_GOMMCONFIG
2218 bool "MMConfig"
2219
2220config PCI_GODIRECT
2221 bool "Direct"
2222
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002223config PCI_GOOLPC
Daniel Drake76fb6572010-09-23 17:28:04 +01002224 bool "OLPC XO-1"
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002225 depends on OLPC
2226
Andres Salomon2bdd1b02008-06-05 14:14:41 -07002227config PCI_GOANY
2228 bool "Any"
2229
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002230endchoice
2231
2232config PCI_BIOS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002233 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02002234 depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002235
2236# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
2237config PCI_DIRECT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002238 def_bool y
Shaohua Li0aba4962011-05-27 14:59:39 +08002239 depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC || PCI_GOMMCONFIG))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002240
2241config PCI_MMCONFIG
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002242 def_bool y
Feng Tang5f0db7a2009-08-14 15:37:50 -04002243 depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002244
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002245config PCI_OLPC
Andres Salomon2bdd1b02008-06-05 14:14:41 -07002246 def_bool y
2247 depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002248
Alex Nixonb5401a92010-03-18 16:31:34 -04002249config PCI_XEN
2250 def_bool y
2251 depends on PCI && XEN
2252 select SWIOTLB_XEN
2253
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002254config PCI_DOMAINS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002255 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002256 depends on PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002257
2258config PCI_MMCONFIG
2259 bool "Support mmconfig PCI config space access"
2260 depends on X86_64 && PCI && ACPI
2261
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07002262config PCI_CNB20LE_QUIRK
David Rientjes6a108a12011-01-20 14:44:16 -08002263 bool "Read CNB20LE Host Bridge Windows" if EXPERT
Kees Cook6ea30382012-10-02 11:16:47 -07002264 depends on PCI
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07002265 help
2266 Read the PCI windows out of the CNB20LE host bridge. This allows
2267 PCI hotplug to work on systems with the CNB20LE chipset which do
2268 not have ACPI.
2269
Bjorn Helgaas64a5fed2011-01-06 10:12:30 -07002270 There's no public spec for this chipset, and this functionality
2271 is known to be incomplete.
2272
2273 You should say N unless you know you need this.
2274
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002275source "drivers/pci/pcie/Kconfig"
2276
2277source "drivers/pci/Kconfig"
2278
David Rientjes1c00f012011-03-22 16:34:59 -07002279# x86_64 have no ISA slots, but can have ISA-style DMA.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002280config ISA_DMA_API
David Rientjes1c00f012011-03-22 16:34:59 -07002281 bool "ISA-style DMA support" if (X86_64 && EXPERT)
2282 default y
2283 help
2284 Enables ISA-style DMA support for devices requiring such controllers.
2285 If unsure, say Y.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002286
2287if X86_32
2288
2289config ISA
2290 bool "ISA support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002291 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002292 Find out whether you have ISA slots on your motherboard. ISA is the
2293 name of a bus system, i.e. the way the CPU talks to the other stuff
2294 inside your box. Other bus systems are PCI, EISA, MicroChannel
2295 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
2296 newer boards don't support it. If you have ISA, say Y, otherwise N.
2297
2298config EISA
2299 bool "EISA support"
2300 depends on ISA
2301 ---help---
2302 The Extended Industry Standard Architecture (EISA) bus was
2303 developed as an open alternative to the IBM MicroChannel bus.
2304
2305 The EISA bus provided some of the features of the IBM MicroChannel
2306 bus while maintaining backward compatibility with cards made for
2307 the older ISA bus. The EISA bus saw limited use between 1988 and
2308 1995 when it was made obsolete by the PCI bus.
2309
2310 Say Y here if you are building a kernel for an EISA-based machine.
2311
2312 Otherwise, say N.
2313
2314source "drivers/eisa/Kconfig"
2315
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002316config SCx200
2317 tristate "NatSemi SCx200 support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002318 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002319 This provides basic support for National Semiconductor's
2320 (now AMD's) Geode processors. The driver probes for the
2321 PCI-IDs of several on-chip devices, so its a good dependency
2322 for other scx200_* drivers.
2323
2324 If compiled as a module, the driver is named scx200.
2325
2326config SCx200HR_TIMER
2327 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
John Stultz592913e2010-07-13 17:56:20 -07002328 depends on SCx200
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002329 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002330 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002331 This driver provides a clocksource built upon the on-chip
2332 27MHz high-resolution timer. Its also a workaround for
2333 NSC Geode SC-1100's buggy TSC, which loses time when the
2334 processor goes idle (as is done by the scheduler). The
2335 other workaround is idle=poll boot option.
2336
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002337config OLPC
2338 bool "One Laptop Per Child support"
Thomas Gleixner54008972011-02-23 09:50:15 +01002339 depends on !X86_PAE
Andres Salomon3c554942009-12-14 18:00:36 -08002340 select GPIOLIB
Thomas Gleixnerdc3119e72011-02-23 10:08:31 +01002341 select OF
Daniel Drake45bb1672011-03-13 15:10:17 +00002342 select OF_PROMTREE
Grant Likelyb4e51852011-12-16 15:50:17 -07002343 select IRQ_DOMAIN
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002344 ---help---
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002345 Add support for detecting the unique features of the OLPC
2346 XO hardware.
2347
Daniel Drakea3128582011-06-25 17:34:10 +01002348config OLPC_XO1_PM
2349 bool "OLPC XO-1 Power Management"
Daniel Drake97c4cb72011-06-25 17:34:11 +01002350 depends on OLPC && MFD_CS5535 && PM_SLEEP
Daniel Drakea3128582011-06-25 17:34:10 +01002351 select MFD_CORE
Daniel Drakebf1ebf02010-10-10 10:40:32 +01002352 ---help---
Daniel Drake97c4cb72011-06-25 17:34:11 +01002353 Add support for poweroff and suspend of the OLPC XO-1 laptop.
Daniel Drakebf1ebf02010-10-10 10:40:32 +01002354
Daniel Drakecfee9592011-06-25 17:34:17 +01002355config OLPC_XO1_RTC
2356 bool "OLPC XO-1 Real Time Clock"
2357 depends on OLPC_XO1_PM && RTC_DRV_CMOS
2358 ---help---
2359 Add support for the XO-1 real time clock, which can be used as a
2360 programmable wakeup source.
2361
Daniel Drake7feda8e2011-06-25 17:34:12 +01002362config OLPC_XO1_SCI
2363 bool "OLPC XO-1 SCI extras"
Daniel Draked8d01a62011-07-24 18:33:21 +01002364 depends on OLPC && OLPC_XO1_PM
Randy Dunlaped8e47f2012-12-18 12:22:17 -08002365 depends on INPUT=y
Daniel Draked8d01a62011-07-24 18:33:21 +01002366 select POWER_SUPPLY
Daniel Drake7feda8e2011-06-25 17:34:12 +01002367 select GPIO_CS5535
2368 select MFD_CORE
2369 ---help---
2370 Add support for SCI-based features of the OLPC XO-1 laptop:
Daniel Drake7bc74b32011-06-25 17:34:14 +01002371 - EC-driven system wakeups
Daniel Drake7feda8e2011-06-25 17:34:12 +01002372 - Power button
Daniel Drake7bc74b32011-06-25 17:34:14 +01002373 - Ebook switch
Daniel Drake2cf2bae2011-06-25 17:34:15 +01002374 - Lid switch
Daniel Drakee1040ac2011-06-25 17:34:16 +01002375 - AC adapter status updates
2376 - Battery status updates
Daniel Drake7feda8e2011-06-25 17:34:12 +01002377
Daniel Drakea0f30f52011-06-25 17:34:18 +01002378config OLPC_XO15_SCI
2379 bool "OLPC XO-1.5 SCI extras"
Daniel Draked8d01a62011-07-24 18:33:21 +01002380 depends on OLPC && ACPI
2381 select POWER_SUPPLY
Daniel Drakea0f30f52011-06-25 17:34:18 +01002382 ---help---
2383 Add support for SCI-based features of the OLPC XO-1.5 laptop:
2384 - EC-driven system wakeups
2385 - AC adapter status updates
2386 - Battery status updates
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002387
Ed Wildgoosed4f3e352011-09-20 14:00:12 -07002388config ALIX
2389 bool "PCEngines ALIX System Support (LED setup)"
2390 select GPIOLIB
2391 ---help---
2392 This option enables system support for the PCEngines ALIX.
2393 At present this just sets up LEDs for GPIO control on
2394 ALIX2/3/6 boards. However, other system specific setup should
2395 get added here.
2396
2397 Note: You must still enable the drivers for GPIO and LED support
2398 (GPIO_CS5535 & LEDS_GPIO) to actually use the LEDs
2399
2400 Note: You have to set alix.force=1 for boards with Award BIOS.
2401
Philip Prindevilleda4e3302012-03-05 15:05:15 -08002402config NET5501
2403 bool "Soekris Engineering net5501 System Support (LEDS, GPIO, etc)"
2404 select GPIOLIB
2405 ---help---
2406 This option enables system support for the Soekris Engineering net5501.
2407
Philip A. Prindeville31970592012-01-14 01:45:39 -07002408config GEOS
2409 bool "Traverse Technologies GEOS System Support (LEDS, GPIO, etc)"
2410 select GPIOLIB
2411 depends on DMI
2412 ---help---
2413 This option enables system support for the Traverse Technologies GEOS.
2414
Vivien Didelot7d029122013-01-04 16:18:14 -05002415config TS5500
2416 bool "Technologic Systems TS-5500 platform support"
2417 depends on MELAN
2418 select CHECK_SIGNATURE
2419 select NEW_LEDS
2420 select LEDS_CLASS
2421 ---help---
2422 This option enables system support for the Technologic Systems TS-5500.
2423
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002424endif # X86_32
2425
Andreas Herrmann23ac4ae2010-09-17 18:03:43 +02002426config AMD_NB
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002427 def_bool y
Borislav Petkov0e152cd2010-03-12 15:43:03 +01002428 depends on CPU_SUP_AMD && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002429
2430source "drivers/pcmcia/Kconfig"
2431
2432source "drivers/pci/hotplug/Kconfig"
2433
Alexandre Bounine388b78a2011-03-23 16:43:03 -07002434config RAPIDIO
Alexandre Bouninefdf90ab2013-07-03 15:08:56 -07002435 tristate "RapidIO support"
Alexandre Bounine388b78a2011-03-23 16:43:03 -07002436 depends on PCI
2437 default n
2438 help
Alexandre Bouninefdf90ab2013-07-03 15:08:56 -07002439 If enabled this option will include drivers and the core
Alexandre Bounine388b78a2011-03-23 16:43:03 -07002440 infrastructure code to support RapidIO interconnect devices.
2441
2442source "drivers/rapidio/Kconfig"
2443
David Herrmanne3263ab2013-08-02 14:05:22 +02002444config X86_SYSFB
2445 bool "Mark VGA/VBE/EFI FB as generic system framebuffer"
2446 help
2447 Firmwares often provide initial graphics framebuffers so the BIOS,
2448 bootloader or kernel can show basic video-output during boot for
2449 user-guidance and debugging. Historically, x86 used the VESA BIOS
2450 Extensions and EFI-framebuffers for this, which are mostly limited
2451 to x86.
2452 This option, if enabled, marks VGA/VBE/EFI framebuffers as generic
2453 framebuffers so the new generic system-framebuffer drivers can be
2454 used on x86. If the framebuffer is not compatible with the generic
2455 modes, it is adverticed as fallback platform framebuffer so legacy
2456 drivers like efifb, vesafb and uvesafb can pick it up.
2457 If this option is not selected, all system framebuffers are always
2458 marked as fallback platform framebuffers as usual.
2459
2460 Note: Legacy fbdev drivers, including vesafb, efifb, uvesafb, will
2461 not be able to pick up generic system framebuffers if this option
2462 is selected. You are highly encouraged to enable simplefb as
2463 replacement if you select this option. simplefb can correctly deal
2464 with generic system framebuffers. But you should still keep vesafb
2465 and others enabled as fallback if a system framebuffer is
2466 incompatible with simplefb.
2467
2468 If unsure, say Y.
2469
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002470endmenu
2471
2472
2473menu "Executable file formats / Emulations"
2474
2475source "fs/Kconfig.binfmt"
2476
2477config IA32_EMULATION
2478 bool "IA32 Emulation"
2479 depends on X86_64
Randy Dunlapd1603992013-06-18 12:33:40 -07002480 select BINFMT_ELF
Roland McGratha97f52e2008-01-30 13:31:55 +01002481 select COMPAT_BINFMT_ELF
Catalin Marinasaf1839e2012-10-08 16:28:08 -07002482 select HAVE_UID16
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002483 ---help---
H. J. Lu5fd92e62012-02-19 10:40:03 -08002484 Include code to run legacy 32-bit programs under a
2485 64-bit kernel. You should likely turn this on, unless you're
2486 100% sure that you don't have any 32-bit programs left.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002487
2488config IA32_AOUT
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002489 tristate "IA32 a.out support"
2490 depends on IA32_EMULATION
2491 ---help---
2492 Support old a.out binaries in the 32bit emulation.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002493
H. Peter Anvin0bf62762012-02-27 14:09:10 -08002494config X86_X32
Kees Cook6ea30382012-10-02 11:16:47 -07002495 bool "x32 ABI for 64-bit mode"
2496 depends on X86_64 && IA32_EMULATION
H. J. Lu5fd92e62012-02-19 10:40:03 -08002497 ---help---
2498 Include code to run binaries for the x32 native 32-bit ABI
2499 for 64-bit processors. An x32 process gets access to the
2500 full 64-bit register file and wide data path while leaving
2501 pointers at 32 bits for smaller memory footprint.
2502
2503 You will need a recent binutils (2.22 or later) with
2504 elf32_x86_64 support enabled to compile a kernel with this
2505 option set.
2506
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002507config COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002508 def_bool y
H. Peter Anvin0bf62762012-02-27 14:09:10 -08002509 depends on IA32_EMULATION || X86_X32
Chris Metcalf48b25c42012-03-15 13:13:38 -04002510 select ARCH_WANT_OLD_COMPAT_IPC
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002511
Jan Beulich3120e252012-09-10 12:41:45 +01002512if COMPAT
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002513config COMPAT_FOR_U64_ALIGNMENT
Jan Beulich3120e252012-09-10 12:41:45 +01002514 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002515
2516config SYSVIPC_COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002517 def_bool y
Jan Beulich3120e252012-09-10 12:41:45 +01002518 depends on SYSVIPC
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002519
David Howellsee009e4a02011-03-07 15:06:20 +00002520config KEYS_COMPAT
Jan Beulich3120e252012-09-10 12:41:45 +01002521 def_bool y
2522 depends on KEYS
2523endif
David Howellsee009e4a02011-03-07 15:06:20 +00002524
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002525endmenu
2526
2527
Keith Packarde5beae12008-11-03 18:21:45 +01002528config HAVE_ATOMIC_IOMAP
2529 def_bool y
2530 depends on X86_32
2531
Alessandro Rubini4692d772012-04-04 19:39:58 +02002532config X86_DEV_DMA_OPS
2533 bool
Alessandro Rubini83125a32012-04-04 19:40:21 +02002534 depends on X86_64 || STA2X11
Alessandro Rubini4692d772012-04-04 19:39:58 +02002535
Alessandro Rubinif7219a52012-04-04 19:40:10 +02002536config X86_DMA_REMAP
2537 bool
Alessandro Rubini83125a32012-04-04 19:40:21 +02002538 depends on STA2X11
Alessandro Rubinif7219a52012-04-04 19:40:10 +02002539
Li, Aubrey93e5ead2014-06-30 14:08:42 +08002540config PMC_ATOM
2541 def_bool y
2542 depends on PCI
2543
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002544source "net/Kconfig"
2545
2546source "drivers/Kconfig"
2547
2548source "drivers/firmware/Kconfig"
2549
2550source "fs/Kconfig"
2551
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002552source "arch/x86/Kconfig.debug"
2553
2554source "security/Kconfig"
2555
2556source "crypto/Kconfig"
2557
Avi Kivityedf88412007-12-16 11:02:48 +02002558source "arch/x86/kvm/Kconfig"
2559
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002560source "lib/Kconfig"