blob: 3e15cee34aeedb23c71caac40bb53fda37bb76eb [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
Ken Xue92082a82015-02-06 08:27:51 +0800499config X86_AMD_PLATFORM_DEVICE
500 bool "AMD ACPI2Platform devices support"
501 depends on ACPI
502 select COMMON_CLK
503 select PINCTRL
504 ---help---
505 Select to interpret AMD specific ACPI device to platform device
506 such as I2C, UART, GPIO found on AMD Carrizo and later chipsets.
507 I2C and UART depend on COMMON_CLK to set clock. GPIO driver is
508 implemented under PINCTRL subsystem.
509
David E. Boxced3ce72014-09-17 22:13:50 -0700510config IOSF_MBI
511 tristate "Intel SoC IOSF Sideband support for SoC platforms"
512 depends on PCI
513 ---help---
514 This option enables sideband register access support for Intel SoC
515 platforms. On these platforms the IOSF sideband is used in lieu of
516 MSR's for some register accesses, mostly but not limited to thermal
517 and power. Drivers may query the availability of this device to
518 determine if they need the sideband in order to work on these
519 platforms. The sideband is available on the following SoC products.
520 This list is not meant to be exclusive.
521 - BayTrail
522 - Braswell
523 - Quark
524
525 You should say Y if you are running a kernel on one of these SoC's.
526
David E. Boxed2226b2014-09-17 22:13:51 -0700527config IOSF_MBI_DEBUG
528 bool "Enable IOSF sideband access through debugfs"
529 depends on IOSF_MBI && DEBUG_FS
530 ---help---
531 Select this option to expose the IOSF sideband access registers (MCR,
532 MDR, MCRX) through debugfs to write and read register information from
533 different units on the SoC. This is most useful for obtaining device
534 state information for debug and analysis. As this is a general access
535 mechanism, users of this option would have specific knowledge of the
536 device they want to access.
537
538 If you don't require the option or are in doubt, say N.
539
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800540config X86_RDC321X
541 bool "RDC R-321x SoC"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100542 depends on X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800543 depends on X86_EXTENDED_PLATFORM
544 select M486
545 select X86_REBOOTFIXUPS
546 ---help---
547 This option is needed for RDC R-321x system-on-chip, also known
548 as R-8610-(G).
549 If you don't have one of these chips, you should say N here.
550
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100551config X86_32_NON_STANDARD
Ingo Molnar9c398012009-01-27 18:24:57 +0100552 bool "Support non-standard 32-bit SMP architectures"
553 depends on X86_32 && SMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800554 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100555 ---help---
H. Peter Anvinb5660ba2014-02-25 12:14:06 -0800556 This option compiles in the bigsmp and STA2X11 default
557 subarchitectures. It is intended for a generic binary
558 kernel. If you select them all, kernel will probe it one by
559 one and will fallback to default.
Yinghai Lud49c4282008-06-08 18:31:54 -0700560
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800561# Alphabetically sorted list of Non standard 32 bit platforms
Yinghai Lud49c4282008-06-08 18:31:54 -0700562
Linus Torvaldsd949f362009-09-26 09:35:07 -0700563config X86_SUPPORTS_MEMORY_FAILURE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100564 def_bool y
Linus Torvaldsd949f362009-09-26 09:35:07 -0700565 # MCE code calls memory_failure():
566 depends on X86_MCE
567 # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
Linus Torvaldsd949f362009-09-26 09:35:07 -0700568 # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
569 depends on X86_64 || !SPARSEMEM
570 select ARCH_SUPPORTS_MEMORY_FAILURE
Linus Torvaldsd949f362009-09-26 09:35:07 -0700571
Alessandro Rubini83125a32012-04-04 19:40:21 +0200572config STA2X11
573 bool "STA2X11 Companion Chip Support"
574 depends on X86_32_NON_STANDARD && PCI
575 select X86_DEV_DMA_OPS
576 select X86_DMA_REMAP
577 select SWIOTLB
578 select MFD_STA2X11
579 select ARCH_REQUIRE_GPIOLIB
580 default n
581 ---help---
582 This adds support for boards based on the STA2X11 IO-Hub,
583 a.k.a. "ConneXt". The chip is used in place of the standard
584 PC chipset, so all "standard" peripherals are missing. If this
585 option is selected the kernel will still be able to boot on
586 standard PC machines.
587
Shérab82148d12010-09-25 06:06:57 +0200588config X86_32_IRIS
589 tristate "Eurobraille/Iris poweroff module"
590 depends on X86_32
591 ---help---
592 The Iris machines from EuroBraille do not have APM or ACPI support
593 to shut themselves down properly. A special I/O sequence is
594 needed to do so, which is what this module does at
595 kernel shutdown.
596
597 This is only for Iris machines from EuroBraille.
598
599 If unused, say N.
600
Ingo Molnarae1e9132008-11-11 09:05:16 +0100601config SCHED_OMIT_FRAME_POINTER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100602 def_bool y
603 prompt "Single-depth WCHAN output"
Ken Chena87d0912008-11-06 11:10:49 -0800604 depends on X86
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100605 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100606 Calculate simpler /proc/<PID>/wchan values. If this option
607 is disabled then wchan values will recurse back to the
608 caller function. This provides more accurate wchan values,
609 at the expense of slightly more scheduling overhead.
610
611 If in doubt, say "Y".
612
Borislav Petkov6276a072013-03-04 21:20:21 +0100613menuconfig HYPERVISOR_GUEST
614 bool "Linux guest support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100615 ---help---
Borislav Petkov6276a072013-03-04 21:20:21 +0100616 Say Y here to enable options for running Linux under various hyper-
617 visors. This option enables basic hypervisor detection and platform
618 setup.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100619
Borislav Petkov6276a072013-03-04 21:20:21 +0100620 If you say N, all options in this submenu will be skipped and
621 disabled, and Linux guest support won't be built in.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100622
Borislav Petkov6276a072013-03-04 21:20:21 +0100623if HYPERVISOR_GUEST
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100624
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100625config PARAVIRT
626 bool "Enable paravirtualization code"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100627 ---help---
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100628 This changes the kernel so it can modify itself when it is run
629 under a hypervisor, potentially improving performance significantly
630 over full virtualization. However, when run without a hypervisor
631 the kernel is theoretically slower and slightly larger.
632
Borislav Petkov6276a072013-03-04 21:20:21 +0100633config PARAVIRT_DEBUG
634 bool "paravirt-ops debugging"
635 depends on PARAVIRT && DEBUG_KERNEL
636 ---help---
637 Enable to debug paravirt_ops internals. Specifically, BUG if
638 a paravirt_op is missing when it is called.
639
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700640config PARAVIRT_SPINLOCKS
641 bool "Paravirtualization layer for spinlocks"
Kees Cook6ea30382012-10-02 11:16:47 -0700642 depends on PARAVIRT && SMP
Raghavendra K T8db73262013-08-09 19:51:50 +0530643 select UNINLINE_SPIN_UNLOCK
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700644 ---help---
645 Paravirtualized spinlocks allow a pvops backend to replace the
646 spinlock implementation with something virtualization-friendly
647 (for example, block the virtual CPU rather than spinning).
648
Raghavendra K T4c4e4f62013-10-21 21:35:08 +0530649 It has a minimal impact on native kernels and gives a nice performance
650 benefit on paravirtualized KVM / Xen kernels.
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700651
Raghavendra K T4c4e4f62013-10-21 21:35:08 +0530652 If you are unsure how to answer this question, answer Y.
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700653
Borislav Petkov6276a072013-03-04 21:20:21 +0100654source "arch/x86/xen/Kconfig"
655
656config KVM_GUEST
657 bool "KVM Guest support (including kvmclock)"
658 depends on PARAVIRT
659 select PARAVIRT_CLOCK
660 default y
661 ---help---
662 This option enables various optimizations for running under the KVM
663 hypervisor. It includes a paravirtualized clock, so that instead
664 of relying on a PIT (or probably other) emulation by the
665 underlying device model, the host provides the guest with
666 timing infrastructure such as time of day, and system time
667
Srivatsa Vaddagiri1e20eb82013-08-09 19:52:01 +0530668config KVM_DEBUG_FS
669 bool "Enable debug information for KVM Guests in debugfs"
670 depends on KVM_GUEST && DEBUG_FS
671 default n
672 ---help---
673 This option enables collection of various statistics for KVM guest.
674 Statistics are displayed in debugfs filesystem. Enabling this option
675 may incur significant overhead.
676
Borislav Petkov6276a072013-03-04 21:20:21 +0100677source "arch/x86/lguest/Kconfig"
678
679config PARAVIRT_TIME_ACCOUNTING
680 bool "Paravirtual steal time accounting"
681 depends on PARAVIRT
682 default n
683 ---help---
684 Select this option to enable fine granularity task steal time
685 accounting. Time spent executing other tasks in parallel with
686 the current vCPU is discounted from the vCPU power. To account for
687 that, there can be a small performance impact.
688
689 If in doubt, say N here.
690
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200691config PARAVIRT_CLOCK
692 bool
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200693
Borislav Petkov6276a072013-03-04 21:20:21 +0100694endif #HYPERVISOR_GUEST
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400695
Yinghai Lu08677212010-02-10 01:20:20 -0800696config NO_BOOTMEM
Yinghai Lu774ea0b2010-08-25 13:39:18 -0700697 def_bool y
Yinghai Lu08677212010-02-10 01:20:20 -0800698
Yinghai Lu03273182008-04-18 17:49:15 -0700699config MEMTEST
700 bool "Memtest"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100701 ---help---
Yinghai Luc64df702008-03-21 18:56:19 -0700702 This option adds a kernel parameter 'memtest', which allows memtest
Yinghai Lu03273182008-04-18 17:49:15 -0700703 to be set.
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100704 memtest=0, mean disabled; -- default
705 memtest=1, mean do 1 test pattern;
706 ...
707 memtest=4, mean do 4 test patterns.
Thomas Gleixneraba37282008-07-15 14:48:48 +0200708 If you are unsure how to answer this question, answer N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100709
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100710source "arch/x86/Kconfig.cpu"
711
712config HPET_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100713 def_bool X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100714 prompt "HPET Timer Support" if X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100715 ---help---
716 Use the IA-PC HPET (High Precision Event Timer) to manage
717 time in preference to the PIT and RTC, if a HPET is
718 present.
719 HPET is the next generation timer replacing legacy 8254s.
720 The HPET provides a stable time base on SMP
721 systems, unlike the TSC, but it is more expensive to access,
722 as it is off-chip. You can find the HPET spec at
723 <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100724
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100725 You can safely choose Y here. However, HPET will only be
726 activated if the platform and the BIOS support this feature.
727 Otherwise the 8254 will be used for timing services.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100728
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100729 Choose N to continue using the legacy 8254 timer.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100730
731config HPET_EMULATE_RTC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100732 def_bool y
Bernhard Walle9d8af782008-02-06 01:38:52 -0800733 depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100734
Jacob Panbb24c472009-09-02 07:37:17 -0700735config APB_TIMER
Alan Cox933b9462011-12-17 17:43:40 +0000736 def_bool y if X86_INTEL_MID
737 prompt "Intel MID APB Timer Support" if X86_INTEL_MID
Jamie Iles06c3df42011-06-06 12:43:07 +0100738 select DW_APB_TIMER
Alan Coxa0c38322011-12-17 21:57:25 +0000739 depends on X86_INTEL_MID && SFI
Jacob Panbb24c472009-09-02 07:37:17 -0700740 help
741 APB timer is the replacement for 8254, HPET on X86 MID platforms.
742 The APBT provides a stable time base on SMP
743 systems, unlike the TSC, but it is more expensive to access,
744 as it is off-chip. APB timers are always running regardless of CPU
745 C states, they are used as per CPU clockevent device when possible.
746
David Rientjes6a108a12011-01-20 14:44:16 -0800747# Mark as expert because too many people got it wrong.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100748# The code disables itself when not needed.
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700749config DMI
750 default y
Ard Biesheuvelcf074402014-01-23 15:54:39 -0800751 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
David Rientjes6a108a12011-01-20 14:44:16 -0800752 bool "Enable DMI scanning" if EXPERT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100753 ---help---
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700754 Enabled scanning of DMI to identify machine quirks. Say Y
755 here unless you have verified that your setup is not
756 affected by entries in the DMI blacklist. Required by PNP
757 BIOS code.
758
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100759config GART_IOMMU
Andi Kleen38901f12013-10-04 14:37:56 -0700760 bool "Old AMD GART IOMMU support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100761 select SWIOTLB
Andreas Herrmann23ac4ae2010-09-17 18:03:43 +0200762 depends on X86_64 && PCI && AMD_NB
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100763 ---help---
Ingo Molnarced3c422013-10-06 11:45:20 +0200764 Provides a driver for older AMD Athlon64/Opteron/Turion/Sempron
765 GART based hardware IOMMUs.
766
767 The GART supports full DMA access for devices with 32-bit access
768 limitations, on systems with more than 3 GB. This is usually needed
769 for USB, sound, many IDE/SATA chipsets and some other devices.
770
771 Newer systems typically have a modern AMD IOMMU, supported via
772 the CONFIG_AMD_IOMMU=y config option.
773
774 In normal configurations this driver is only active when needed:
775 there's more than 3 GB of memory and the system contains a
776 32-bit limited device.
777
778 If unsure, say Y.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100779
780config CALGARY_IOMMU
781 bool "IBM Calgary IOMMU support"
782 select SWIOTLB
Kees Cook6ea30382012-10-02 11:16:47 -0700783 depends on X86_64 && PCI
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100784 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100785 Support for hardware IOMMUs in IBM's xSeries x366 and x460
786 systems. Needed to run systems with more than 3GB of memory
787 properly with 32-bit PCI devices that do not support DAC
788 (Double Address Cycle). Calgary also supports bus level
789 isolation, where all DMAs pass through the IOMMU. This
790 prevents them from going anywhere except their intended
791 destination. This catches hard-to-find kernel bugs and
792 mis-behaving drivers and devices that do not use the DMA-API
793 properly to set up their DMA buffers. The IOMMU can be
794 turned off at boot time with the iommu=off parameter.
795 Normally the kernel will make the right choice by itself.
796 If unsure, say Y.
797
798config CALGARY_IOMMU_ENABLED_BY_DEFAULT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100799 def_bool y
800 prompt "Should Calgary be enabled by default?"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100801 depends on CALGARY_IOMMU
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100802 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100803 Should Calgary be enabled by default? if you choose 'y', Calgary
804 will be used (if it exists). If you choose 'n', Calgary will not be
805 used even if it exists. If you choose 'n' and would like to use
806 Calgary anyway, pass 'iommu=calgary' on the kernel command line.
807 If unsure, say Y.
808
809# need this always selected by IOMMU for the VIA workaround
810config SWIOTLB
Joerg Roedela1afd012008-11-18 12:44:21 +0100811 def_bool y if X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100812 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100813 Support for software bounce buffers used on x86-64 systems
Joe Millenbach4454d322012-09-02 17:38:20 -0700814 which don't have a hardware IOMMU. Using this PCI devices
815 which can only access 32-bits of memory can be used on systems
816 with more than 3 GB of memory.
817 If unsure, say Y.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100818
FUJITA Tomonoria8522502008-04-29 00:59:36 -0700819config IOMMU_HELPER
Jan Beulich3120e252012-09-10 12:41:45 +0100820 def_bool y
821 depends on CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700822
Mike Travis1184dc22008-05-12 21:21:12 +0200823config MAXSMP
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200824 bool "Enable Maximum number of SMP Processors and NUMA Nodes"
Kees Cook6ea30382012-10-02 11:16:47 -0700825 depends on X86_64 && SMP && DEBUG_KERNEL
Mike Travis36f51012008-12-16 17:33:51 -0800826 select CPUMASK_OFFSTACK
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100827 ---help---
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200828 Enable maximum number of CPUS and NUMA Nodes for this architecture.
Mike Travis1184dc22008-05-12 21:21:12 +0200829 If unsure, say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100830
831config NR_CPUS
Mike Travis36f51012008-12-16 17:33:51 -0800832 int "Maximum number of CPUs" if SMP && !MAXSMP
Michael K. Johnson2a3313f2009-04-21 21:44:48 -0400833 range 2 8 if SMP && X86_32 && !X86_BIGSMP
Josh Boyerbb61ccc2013-11-05 09:37:29 -0500834 range 2 512 if SMP && !MAXSMP && !CPUMASK_OFFSTACK
Josh Boyerb53b5ed2013-11-05 09:38:16 -0500835 range 2 8192 if SMP && !MAXSMP && CPUMASK_OFFSTACK && X86_64
Mike Travis78637a972008-12-16 17:34:00 -0800836 default "1" if !SMP
Josh Boyerb53b5ed2013-11-05 09:38:16 -0500837 default "8192" if MAXSMP
H. Peter Anvinb5660ba2014-02-25 12:14:06 -0800838 default "32" if SMP && X86_BIGSMP
Mike Travis78637a972008-12-16 17:34:00 -0800839 default "8" if SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100840 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100841 This allows you to specify the maximum number of CPUs which this
Josh Boyerbb61ccc2013-11-05 09:37:29 -0500842 kernel will support. If CPUMASK_OFFSTACK is enabled, the maximum
843 supported value is 4096, otherwise the maximum value is 512. The
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100844 minimum value which makes sense is 2.
845
846 This is purely to save memory - each supported CPU adds
847 approximately eight kilobytes to the kernel image.
848
849config SCHED_SMT
850 bool "SMT (Hyperthreading) scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800851 depends on X86_HT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100852 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100853 SMT scheduler support improves the CPU scheduler's decision making
854 when dealing with Intel Pentium 4 chips with HyperThreading at a
855 cost of slightly increased overhead in some places. If unsure say
856 N here.
857
858config SCHED_MC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100859 def_bool y
860 prompt "Multi-core scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800861 depends on X86_HT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100862 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100863 Multi-core scheduler support improves the CPU scheduler's decision
864 making when dealing with multi-core CPU chips at a cost of slightly
865 increased overhead in some places. If unsure say N here.
866
867source "kernel/Kconfig.preempt"
868
869config X86_UP_APIC
870 bool "Local APIC support on uniprocessors"
Bryan O'Donoghue38a1dfd2015-01-22 22:58:49 +0000871 depends on X86_32 && !SMP && !X86_32_NON_STANDARD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100872 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100873 A local APIC (Advanced Programmable Interrupt Controller) is an
874 integrated interrupt controller in the CPU. If you have a single-CPU
875 system which has a processor with a local APIC, you can say Y here to
876 enable and use it. If you say Y here even though your machine doesn't
877 have a local APIC, then the kernel will still run with no slowdown at
878 all. The local APIC supports CPU-generated self-interrupts (timer,
879 performance counters), and the NMI watchdog which detects hard
880 lockups.
881
Bryan O'Donoghue38a1dfd2015-01-22 22:58:49 +0000882config X86_UP_APIC_MSI
883 def_bool y
884 select X86_UP_APIC if X86_32 && !SMP && !X86_32_NON_STANDARD && PCI_MSI
885
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100886config X86_UP_IOAPIC
887 bool "IO-APIC support on uniprocessors"
888 depends on X86_UP_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100889 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100890 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
891 SMP-capable replacement for PC-style interrupt controllers. Most
892 SMP systems and many recent uniprocessor systems have one.
893
894 If you have a single-CPU system with an IO-APIC, you can say Y here
895 to use it. If you say Y here even though your machine doesn't have
896 an IO-APIC, then the kernel will still run with no slowdown at all.
897
898config X86_LOCAL_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100899 def_bool y
Thomas Petazzoni0dbc6072013-10-03 11:59:14 +0200900 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC || PCI_MSI
Jiang Liu74afab72014-10-27 16:12:00 +0800901 select GENERIC_IRQ_LEGACY_ALLOC_HWIRQ
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100902
903config X86_IO_APIC
Jiang Liu2f600022014-10-27 16:12:06 +0800904 def_bool X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_IOAPIC
905 depends on X86_LOCAL_APIC
Jiang Liud7f3d472014-06-09 16:19:52 +0800906 select IRQ_DOMAIN
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100907
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200908config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
909 bool "Reroute for broken boot IRQs"
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200910 depends on X86_IO_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100911 ---help---
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200912 This option enables a workaround that fixes a source of
913 spurious interrupts. This is recommended when threaded
914 interrupt handling is used on systems where the generation of
915 superfluous "boot interrupts" cannot be disabled.
916
917 Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
918 entry in the chipset's IO-APIC is masked (as, e.g. the RT
919 kernel does during interrupt handling). On chipsets where this
920 boot IRQ generation cannot be disabled, this workaround keeps
921 the original IRQ line masked so that only the equivalent "boot
922 IRQ" is delivered to the CPUs. The workaround also tells the
923 kernel to set up the IRQ handler on the boot IRQ line. In this
924 way only one interrupt is delivered to the kernel. Otherwise
925 the spurious second interrupt may cause the kernel to bring
926 down (vital) interrupt lines.
927
928 Only affects "broken" chipsets. Interrupt sharing may be
929 increased on these systems.
930
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100931config X86_MCE
Andi Kleenbab9bc62009-07-09 00:31:38 +0200932 bool "Machine Check / overheating reporting"
Borislav Petkove57dbaf2011-09-13 15:23:21 +0200933 default y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100934 ---help---
Andi Kleenbab9bc62009-07-09 00:31:38 +0200935 Machine Check support allows the processor to notify the
936 kernel if it detects a problem (e.g. overheating, data corruption).
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100937 The action the kernel takes depends on the severity of the problem,
Andi Kleenbab9bc62009-07-09 00:31:38 +0200938 ranging from warning messages to halting the machine.
Andi Kleen4efc0672009-04-28 19:07:31 +0200939
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100940config X86_MCE_INTEL
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100941 def_bool y
942 prompt "Intel MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +0200943 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100944 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100945 Additional support for intel specific MCE features such as
946 the thermal monitor.
947
948config X86_MCE_AMD
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100949 def_bool y
950 prompt "AMD MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +0200951 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100952 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100953 Additional support for AMD specific MCE features such as
954 the DRAM Error Threshold.
955
Andi Kleen4efc0672009-04-28 19:07:31 +0200956config X86_ANCIENT_MCE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100957 bool "Support for old Pentium 5 / WinChip machine checks"
Andi Kleenc31d9632009-07-09 00:31:37 +0200958 depends on X86_32 && X86_MCE
Hidetoshi Setocd13adcc2009-05-27 16:57:31 +0900959 ---help---
960 Include support for machine check handling on old Pentium 5 or WinChip
Masanari Iida5065a702013-11-30 21:38:43 +0900961 systems. These typically need to be enabled explicitly on the command
Hidetoshi Setocd13adcc2009-05-27 16:57:31 +0900962 line.
Andi Kleen4efc0672009-04-28 19:07:31 +0200963
Andi Kleenb2762682009-02-12 13:49:31 +0100964config X86_MCE_THRESHOLD
965 depends on X86_MCE_AMD || X86_MCE_INTEL
Jan Beulich6fc108a2010-04-21 15:23:44 +0100966 def_bool y
Andi Kleenb2762682009-02-12 13:49:31 +0100967
Andi Kleenea149b32009-04-29 19:31:00 +0200968config X86_MCE_INJECT
Andi Kleenc1ebf832009-07-09 00:31:41 +0200969 depends on X86_MCE
Andi Kleenea149b32009-04-29 19:31:00 +0200970 tristate "Machine check injector support"
971 ---help---
972 Provide support for injecting machine checks for testing purposes.
973 If you don't know what a machine check is and you don't do kernel
974 QA it is safe to say n.
975
Andi Kleen4efc0672009-04-28 19:07:31 +0200976config X86_THERMAL_VECTOR
977 def_bool y
Andi Kleen5bb38ad2009-07-09 00:31:39 +0200978 depends on X86_MCE_INTEL
Andi Kleen4efc0672009-04-28 19:07:31 +0200979
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100980config VM86
David Rientjes6a108a12011-01-20 14:44:16 -0800981 bool "Enable VM86 support" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100982 default y
983 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100984 ---help---
H. Peter Anvin34273f42014-05-04 10:36:22 -0700985 This option is required by programs like DOSEMU to run
986 16-bit real mode legacy code on x86 processors. It also may
987 be needed by software like XFree86 to initialize some video
988 cards via BIOS. Disabling this option saves about 6K.
989
990config X86_16BIT
991 bool "Enable support for 16-bit segments" if EXPERT
992 default y
993 ---help---
994 This option is required by programs like Wine to run 16-bit
995 protected mode legacy code on x86 processors. Disabling
996 this option saves about 300 bytes on i386, or around 6K text
997 plus 16K runtime memory on x86-64,
998
999config X86_ESPFIX32
1000 def_bool y
1001 depends on X86_16BIT && X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001002
H. Peter Anvin197725d2014-05-04 10:00:49 -07001003config X86_ESPFIX64
1004 def_bool y
H. Peter Anvin34273f42014-05-04 10:36:22 -07001005 depends on X86_16BIT && X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001006
Andy Lutomirski1ad83c82014-10-29 14:33:47 -07001007config X86_VSYSCALL_EMULATION
1008 bool "Enable vsyscall emulation" if EXPERT
1009 default y
1010 depends on X86_64
1011 ---help---
1012 This enables emulation of the legacy vsyscall page. Disabling
1013 it is roughly equivalent to booting with vsyscall=none, except
1014 that it will also disable the helpful warning if a program
1015 tries to use a vsyscall. With this option set to N, offending
1016 programs will just segfault, citing addresses of the form
1017 0xffffffffff600?00.
1018
1019 This option is required by many programs built before 2013, and
1020 care should be used even with newer programs if set to N.
1021
1022 Disabling this option saves about 7K of kernel size and
1023 possibly 4K of additional runtime pagetable memory.
1024
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001025config TOSHIBA
1026 tristate "Toshiba Laptop support"
1027 depends on X86_32
1028 ---help---
1029 This adds a driver to safely access the System Management Mode of
1030 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
1031 not work on models with a Phoenix BIOS. The System Management Mode
1032 is used to set the BIOS and power saving options on Toshiba portables.
1033
1034 For information on utilities to make use of this driver see the
1035 Toshiba Linux utilities web site at:
1036 <http://www.buzzard.org.uk/toshiba/>.
1037
1038 Say Y if you intend to run this kernel on a Toshiba portable.
1039 Say N otherwise.
1040
1041config I8K
1042 tristate "Dell laptop support"
Jean Delvare949a9d72011-05-25 20:43:33 +02001043 select HWMON
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001044 ---help---
1045 This adds a driver to safely access the System Management Mode
1046 of the CPU on the Dell Inspiron 8000. The System Management Mode
1047 is used to read cpu temperature and cooling fan status and to
1048 control the fans on the I8K portables.
1049
1050 This driver has been tested only on the Inspiron 8000 but it may
1051 also work with other Dell laptops. You can force loading on other
1052 models by passing the parameter `force=1' to the module. Use at
1053 your own risk.
1054
1055 For information on utilities to make use of this driver see the
1056 I8K Linux utilities web site at:
1057 <http://people.debian.org/~dz/i8k/>
1058
1059 Say Y if you intend to run this kernel on a Dell Inspiron 8000.
1060 Say N otherwise.
1061
1062config X86_REBOOTFIXUPS
Jan Beulich9ba16082008-10-15 22:01:38 -07001063 bool "Enable X86 board specific fixups for reboot"
1064 depends on X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001065 ---help---
1066 This enables chipset and/or board specific fixups to be done
1067 in order to get reboot to work correctly. This is only needed on
1068 some combinations of hardware and BIOS. The symptom, for which
1069 this config is intended, is when reboot ends with a stalled/hung
1070 system.
1071
1072 Currently, the only fixup is for the Geode machines using
Florian Fainelli5e3a77e2008-01-30 13:33:36 +01001073 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001074
1075 Say Y if you want to enable the fixup. Currently, it's safe to
1076 enable this option even if you don't need it.
1077 Say N otherwise.
1078
1079config MICROCODE
Borislav Petkove43f6e62012-08-01 19:17:01 +02001080 tristate "CPU microcode loading support"
Borislav Petkov80030e32013-10-13 18:36:29 +02001081 depends on CPU_SUP_AMD || CPU_SUP_INTEL
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001082 select FW_LOADER
1083 ---help---
Borislav Petkove43f6e62012-08-01 19:17:01 +02001084
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001085 If you say Y here, you will be able to update the microcode on
Peter Oruba80cc9f12008-07-28 18:44:22 +02001086 certain Intel and AMD processors. The Intel support is for the
Borislav Petkove43f6e62012-08-01 19:17:01 +02001087 IA32 family, e.g. Pentium Pro, Pentium II, Pentium III, Pentium 4,
1088 Xeon etc. The AMD support is for families 0x10 and later. You will
1089 obviously need the actual microcode binary data itself which is not
1090 shipped with the Linux kernel.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001091
Peter Oruba8d86f392008-07-28 18:44:21 +02001092 This option selects the general module only, you need to select
1093 at least one vendor specific module as well.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001094
Borislav Petkove43f6e62012-08-01 19:17:01 +02001095 To compile this driver as a module, choose M here: the module
1096 will be called microcode.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001097
Peter Oruba8d86f392008-07-28 18:44:21 +02001098config MICROCODE_INTEL
Borislav Petkove43f6e62012-08-01 19:17:01 +02001099 bool "Intel microcode loading support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001100 depends on MICROCODE
1101 default MICROCODE
1102 select FW_LOADER
1103 ---help---
1104 This options enables microcode patch loading support for Intel
1105 processors.
Peter Oruba8d86f392008-07-28 18:44:21 +02001106
Alanb8989db2014-01-20 18:01:56 +00001107 For the current Intel microcode data package go to
1108 <https://downloadcenter.intel.com> and search for
1109 'Linux Processor Microcode Data File'.
Peter Oruba8d86f392008-07-28 18:44:21 +02001110
Peter Oruba80cc9f12008-07-28 18:44:22 +02001111config MICROCODE_AMD
Borislav Petkove43f6e62012-08-01 19:17:01 +02001112 bool "AMD microcode loading support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001113 depends on MICROCODE
1114 select FW_LOADER
1115 ---help---
1116 If you select this option, microcode patch loading support for AMD
1117 processors will be enabled.
Peter Oruba80cc9f12008-07-28 18:44:22 +02001118
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001119config MICROCODE_OLD_INTERFACE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001120 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001121 depends on MICROCODE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001122
Fenghua Yuda76f642012-12-20 23:44:32 -08001123config MICROCODE_INTEL_EARLY
Jacob Shin757885e2013-05-30 14:09:19 -05001124 def_bool n
1125
1126config MICROCODE_AMD_EARLY
1127 def_bool n
1128
1129config MICROCODE_EARLY
Fenghua Yuda76f642012-12-20 23:44:32 -08001130 bool "Early load microcode"
Jacob Shin6b3389a2013-05-31 01:53:24 -05001131 depends on MICROCODE=y && BLK_DEV_INITRD
Jacob Shin757885e2013-05-30 14:09:19 -05001132 select MICROCODE_INTEL_EARLY if MICROCODE_INTEL
1133 select MICROCODE_AMD_EARLY if MICROCODE_AMD
Fenghua Yuda76f642012-12-20 23:44:32 -08001134 default y
1135 help
1136 This option provides functionality to read additional microcode data
1137 at the beginning of initrd image. The data tells kernel to load
1138 microcode to CPU's as early as possible. No functional change if no
1139 microcode data is glued to the initrd, therefore it's safe to say Y.
1140
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001141config X86_MSR
1142 tristate "/dev/cpu/*/msr - Model-specific register support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001143 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001144 This device gives privileged processes access to the x86
1145 Model-Specific Registers (MSRs). It is a character device with
1146 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
1147 MSR accesses are directed to a specific CPU on multi-processor
1148 systems.
1149
1150config X86_CPUID
1151 tristate "/dev/cpu/*/cpuid - CPU information support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001152 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001153 This device gives processes access to the x86 CPUID instruction to
1154 be executed on a specific processor. It is a character device
1155 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
1156 /dev/cpu/31/cpuid.
1157
1158choice
1159 prompt "High Memory Support"
Jan Beulich6fc108a2010-04-21 15:23:44 +01001160 default HIGHMEM4G
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001161 depends on X86_32
1162
1163config NOHIGHMEM
1164 bool "off"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001165 ---help---
1166 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
1167 However, the address space of 32-bit x86 processors is only 4
1168 Gigabytes large. That means that, if you have a large amount of
1169 physical memory, not all of it can be "permanently mapped" by the
1170 kernel. The physical memory that's not permanently mapped is called
1171 "high memory".
1172
1173 If you are compiling a kernel which will never run on a machine with
1174 more than 1 Gigabyte total physical RAM, answer "off" here (default
1175 choice and suitable for most users). This will result in a "3GB/1GB"
1176 split: 3GB are mapped so that each process sees a 3GB virtual memory
1177 space and the remaining part of the 4GB virtual memory space is used
1178 by the kernel to permanently map as much physical memory as
1179 possible.
1180
1181 If the machine has between 1 and 4 Gigabytes physical RAM, then
1182 answer "4GB" here.
1183
1184 If more than 4 Gigabytes is used then answer "64GB" here. This
1185 selection turns Intel PAE (Physical Address Extension) mode on.
1186 PAE implements 3-level paging on IA32 processors. PAE is fully
1187 supported by Linux, PAE mode is implemented on all recent Intel
1188 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
1189 then the kernel will not boot on CPUs that don't support PAE!
1190
1191 The actual amount of total physical memory will either be
1192 auto detected or can be forced by using a kernel command line option
1193 such as "mem=256M". (Try "man bootparam" or see the documentation of
1194 your boot loader (lilo or loadlin) about how to pass options to the
1195 kernel at boot time.)
1196
1197 If unsure, say "off".
1198
1199config HIGHMEM4G
1200 bool "4GB"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001201 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001202 Select this if you have a 32-bit processor and between 1 and 4
1203 gigabytes of physical RAM.
1204
1205config HIGHMEM64G
1206 bool "64GB"
H. Peter Anvineb068e72012-11-28 11:50:23 -08001207 depends on !M486
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001208 select X86_PAE
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001209 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001210 Select this if you have a 32-bit processor and more than 4
1211 gigabytes of physical RAM.
1212
1213endchoice
1214
1215choice
David Rientjes6a108a12011-01-20 14:44:16 -08001216 prompt "Memory split" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001217 default VMSPLIT_3G
1218 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001219 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001220 Select the desired split between kernel and user memory.
1221
1222 If the address range available to the kernel is less than the
1223 physical memory installed, the remaining memory will be available
1224 as "high memory". Accessing high memory is a little more costly
1225 than low memory, as it needs to be mapped into the kernel first.
1226 Note that increasing the kernel address space limits the range
1227 available to user programs, making the address space there
1228 tighter. Selecting anything other than the default 3G/1G split
1229 will also likely make your kernel incompatible with binary-only
1230 kernel modules.
1231
1232 If you are not absolutely sure what you are doing, leave this
1233 option alone!
1234
1235 config VMSPLIT_3G
1236 bool "3G/1G user/kernel split"
1237 config VMSPLIT_3G_OPT
1238 depends on !X86_PAE
1239 bool "3G/1G user/kernel split (for full 1G low memory)"
1240 config VMSPLIT_2G
1241 bool "2G/2G user/kernel split"
1242 config VMSPLIT_2G_OPT
1243 depends on !X86_PAE
1244 bool "2G/2G user/kernel split (for full 2G low memory)"
1245 config VMSPLIT_1G
1246 bool "1G/3G user/kernel split"
1247endchoice
1248
1249config PAGE_OFFSET
1250 hex
1251 default 0xB0000000 if VMSPLIT_3G_OPT
1252 default 0x80000000 if VMSPLIT_2G
1253 default 0x78000000 if VMSPLIT_2G_OPT
1254 default 0x40000000 if VMSPLIT_1G
1255 default 0xC0000000
1256 depends on X86_32
1257
1258config HIGHMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001259 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001260 depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001261
1262config X86_PAE
Jan Beulich9ba16082008-10-15 22:01:38 -07001263 bool "PAE (Physical Address Extension) Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001264 depends on X86_32 && !HIGHMEM4G
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001265 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001266 PAE is required for NX support, and furthermore enables
1267 larger swapspace support for non-overcommit purposes. It
1268 has the cost of more pagetable lookup overhead, and also
1269 consumes more pagetable space per process.
1270
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001271config ARCH_PHYS_ADDR_T_64BIT
Jan Beulich3120e252012-09-10 12:41:45 +01001272 def_bool y
1273 depends on X86_64 || X86_PAE
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001274
FUJITA Tomonori66f2b062010-10-20 15:55:35 -07001275config ARCH_DMA_ADDR_T_64BIT
Jan Beulich3120e252012-09-10 12:41:45 +01001276 def_bool y
1277 depends on X86_64 || HIGHMEM64G
FUJITA Tomonori66f2b062010-10-20 15:55:35 -07001278
Nick Piggin9e899812008-10-22 12:33:16 +02001279config DIRECT_GBPAGES
David Rientjes6a108a12011-01-20 14:44:16 -08001280 bool "Enable 1GB pages for kernel pagetables" if EXPERT
Nick Piggin9e899812008-10-22 12:33:16 +02001281 default y
1282 depends on X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001283 ---help---
Nick Piggin9e899812008-10-22 12:33:16 +02001284 Allow the kernel linear mapping to use 1GB pages on CPUs that
1285 support it. This can improve the kernel's performance a tiny bit by
1286 reducing TLB pressure. If in doubt, say "Y".
1287
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001288# Common NUMA Features
1289config NUMA
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001290 bool "Numa Memory Allocation and Scheduler Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001291 depends on SMP
H. Peter Anvinb5660ba2014-02-25 12:14:06 -08001292 depends on X86_64 || (X86_32 && HIGHMEM64G && X86_BIGSMP)
1293 default y if X86_BIGSMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001294 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001295 Enable NUMA (Non Uniform Memory Access) support.
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001296
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001297 The kernel will try to allocate memory used by a CPU on the
1298 local memory controller of the CPU and add some more
1299 NUMA awareness to the kernel.
1300
Ingo Molnarc280ea52008-11-08 13:29:45 +01001301 For 64-bit this is recommended if the system is Intel Core i7
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001302 (or later), AMD Opteron, or EM64T NUMA.
1303
H. Peter Anvinb5660ba2014-02-25 12:14:06 -08001304 For 32-bit this is only needed if you boot a 32-bit
David Rientjes7cf6c942014-02-11 18:11:13 -08001305 kernel on a 64-bit NUMA platform.
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001306
1307 Otherwise, you should say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001308
Hans Rosenfeldeec1d4f2010-10-29 17:14:30 +02001309config AMD_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001310 def_bool y
1311 prompt "Old style AMD Opteron NUMA detection"
Tejun Heo5da0ef92011-07-11 10:34:32 +02001312 depends on X86_64 && NUMA && PCI
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001313 ---help---
Hans Rosenfeldeec1d4f2010-10-29 17:14:30 +02001314 Enable AMD NUMA node topology detection. You should say Y here if
1315 you have a multi processor AMD system. This uses an old method to
1316 read the NUMA configuration directly from the builtin Northbridge
1317 of Opteron. It is recommended to use X86_64_ACPI_NUMA instead,
1318 which also takes priority if both are compiled in.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001319
1320config X86_64_ACPI_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001321 def_bool y
1322 prompt "ACPI NUMA detection"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001323 depends on X86_64 && NUMA && ACPI && PCI
1324 select ACPI_NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001325 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001326 Enable ACPI SRAT based node topology detection.
1327
Suresh Siddha6ec6e0d2008-03-25 10:14:35 -07001328# Some NUMA nodes have memory ranges that span
1329# other nodes. Even though a pfn is valid and
1330# between a node's start and end pfns, it may not
1331# reside on that node. See memmap_init_zone()
1332# for details.
1333config NODES_SPAN_OTHER_NODES
1334 def_bool y
1335 depends on X86_64_ACPI_NUMA
1336
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001337config NUMA_EMU
1338 bool "NUMA emulation"
Tejun Heo1b7e03e2011-05-02 17:24:48 +02001339 depends on NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001340 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001341 Enable NUMA emulation. A flat machine will be split
1342 into virtual nodes when booted with "numa=fake=N", where N is the
1343 number of nodes. This is only useful for debugging.
1344
1345config NODES_SHIFT
Linus Torvaldsd25e26b2008-08-25 14:15:38 -07001346 int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
David Rientjes51591e32010-03-25 15:39:27 -07001347 range 1 10
1348 default "10" if MAXSMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001349 default "6" if X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001350 default "3"
1351 depends on NEED_MULTIPLE_NODES
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001352 ---help---
Mike Travis1184dc22008-05-12 21:21:12 +02001353 Specify the maximum number of NUMA Nodes available on the target
Matt LaPlante692105b2009-01-26 11:12:25 +01001354 system. Increases memory reserved to accommodate various tables.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001355
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001356config ARCH_HAVE_MEMORY_PRESENT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001357 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001358 depends on X86_32 && DISCONTIGMEM
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001359
1360config NEED_NODE_MEMMAP_SIZE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001361 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001362 depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001363
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001364config ARCH_FLATMEM_ENABLE
1365 def_bool y
Tejun Heo3b166512011-04-01 11:15:12 +02001366 depends on X86_32 && !NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001367
1368config ARCH_DISCONTIGMEM_ENABLE
1369 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001370 depends on NUMA && X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001371
1372config ARCH_DISCONTIGMEM_DEFAULT
1373 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001374 depends on NUMA && X86_32
1375
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001376config ARCH_SPARSEMEM_ENABLE
1377 def_bool y
Kees Cook6ea30382012-10-02 11:16:47 -07001378 depends on X86_64 || NUMA || X86_32 || X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001379 select SPARSEMEM_STATIC if X86_32
1380 select SPARSEMEM_VMEMMAP_ENABLE if X86_64
1381
Tejun Heo3b166512011-04-01 11:15:12 +02001382config ARCH_SPARSEMEM_DEFAULT
1383 def_bool y
1384 depends on X86_64
1385
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001386config ARCH_SELECT_MEMORY_MODEL
1387 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001388 depends on ARCH_SPARSEMEM_ENABLE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001389
1390config ARCH_MEMORY_PROBE
Toshi Kania0842b72013-07-19 11:47:48 -06001391 bool "Enable sysfs memory/probe interface"
Jan Beulich3120e252012-09-10 12:41:45 +01001392 depends on X86_64 && MEMORY_HOTPLUG
Toshi Kania0842b72013-07-19 11:47:48 -06001393 help
1394 This option enables a sysfs memory/probe interface for testing.
1395 See Documentation/memory-hotplug.txt for more information.
1396 If you are unsure how to answer this question, answer N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001397
Tejun Heo3b166512011-04-01 11:15:12 +02001398config ARCH_PROC_KCORE_TEXT
1399 def_bool y
1400 depends on X86_64 && PROC_KCORE
1401
Avi Kivitya29815a2010-01-10 16:28:09 +02001402config ILLEGAL_POINTER_VALUE
1403 hex
1404 default 0 if X86_32
1405 default 0xdead000000000000 if X86_64
1406
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001407source "mm/Kconfig"
1408
1409config HIGHPTE
1410 bool "Allocate 3rd-level pagetables from highmem"
Jan Beulich6fc108a2010-04-21 15:23:44 +01001411 depends on HIGHMEM
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001412 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001413 The VM uses one page table entry for each page of physical memory.
1414 For systems with a lot of RAM, this can be wasteful of precious
1415 low memory. Setting this option will put user-space page table
1416 entries in high memory.
1417
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001418config X86_CHECK_BIOS_CORRUPTION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001419 bool "Check for low memory corruption"
1420 ---help---
1421 Periodically check for memory corruption in low memory, which
1422 is suspected to be caused by BIOS. Even when enabled in the
1423 configuration, it is disabled at runtime. Enable it by
1424 setting "memory_corruption_check=1" on the kernel command
1425 line. By default it scans the low 64k of memory every 60
1426 seconds; see the memory_corruption_check_size and
1427 memory_corruption_check_period parameters in
1428 Documentation/kernel-parameters.txt to adjust this.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001429
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001430 When enabled with the default parameters, this option has
1431 almost no overhead, as it reserves a relatively small amount
1432 of memory and scans it infrequently. It both detects corruption
1433 and prevents it from affecting the running system.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001434
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001435 It is, however, intended as a diagnostic tool; if repeatable
1436 BIOS-originated corruption always affects the same memory,
1437 you can use memmap= to prevent the kernel from using that
1438 memory.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001439
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001440config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001441 bool "Set the default setting of memory_corruption_check"
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001442 depends on X86_CHECK_BIOS_CORRUPTION
1443 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001444 ---help---
1445 Set whether the default state of memory_corruption_check is
1446 on or off.
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001447
H. Peter Anvin9ea77bd2010-08-25 16:38:20 -07001448config X86_RESERVE_LOW
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001449 int "Amount of low memory, in kilobytes, to reserve for the BIOS"
1450 default 64
1451 range 4 640
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001452 ---help---
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001453 Specify the amount of low memory to reserve for the BIOS.
Ingo Molnarfc381512008-09-16 10:07:34 +02001454
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001455 The first page contains BIOS data structures that the kernel
1456 must not use, so that page must always be reserved.
Ingo Molnarfc381512008-09-16 10:07:34 +02001457
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001458 By default we reserve the first 64K of physical RAM, as a
1459 number of BIOSes are known to corrupt that memory range
1460 during events such as suspend/resume or monitor cable
1461 insertion, so it must not be used by the kernel.
Ingo Molnarfc381512008-09-16 10:07:34 +02001462
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001463 You can set this to 4 if you are absolutely sure that you
1464 trust the BIOS to get all its memory reservations and usages
1465 right. If you know your BIOS have problems beyond the
1466 default 64K area, you can set this to 640 to avoid using the
1467 entire low memory range.
1468
1469 If you have doubts about the BIOS (e.g. suspend/resume does
1470 not work or there's kernel crashes after certain hardware
1471 hotplug events) then you might want to enable
1472 X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check
1473 typical corruption patterns.
1474
1475 Leave this to the default value of 64 if you are unsure.
Ingo Molnarfc381512008-09-16 10:07:34 +02001476
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001477config MATH_EMULATION
1478 bool
1479 prompt "Math emulation" if X86_32
1480 ---help---
1481 Linux can emulate a math coprocessor (used for floating point
1482 operations) if you don't have one. 486DX and Pentium processors have
1483 a math coprocessor built in, 486SX and 386 do not, unless you added
1484 a 487DX or 387, respectively. (The messages during boot time can
1485 give you some hints here ["man dmesg"].) Everyone needs either a
1486 coprocessor or this emulation.
1487
1488 If you don't have a math coprocessor, you need to say Y here; if you
1489 say Y here even though you have a coprocessor, the coprocessor will
1490 be used nevertheless. (This behavior can be changed with the kernel
1491 command line option "no387", which comes handy if your coprocessor
1492 is broken. Try "man bootparam" or see the documentation of your boot
1493 loader (lilo or loadlin) about how to pass options to the kernel at
1494 boot time.) This means that it is a good idea to say Y here if you
1495 intend to use this kernel on different machines.
1496
1497 More information about the internals of the Linux math coprocessor
1498 emulation can be found in <file:arch/x86/math-emu/README>.
1499
1500 If you are not sure, say Y; apart from resulting in a 66 KB bigger
1501 kernel, it won't hurt.
1502
1503config MTRR
Jan Beulich6fc108a2010-04-21 15:23:44 +01001504 def_bool y
David Rientjes6a108a12011-01-20 14:44:16 -08001505 prompt "MTRR (Memory Type Range Register) support" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001506 ---help---
1507 On Intel P6 family processors (Pentium Pro, Pentium II and later)
1508 the Memory Type Range Registers (MTRRs) may be used to control
1509 processor access to memory ranges. This is most useful if you have
1510 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
1511 allows bus write transfers to be combined into a larger transfer
1512 before bursting over the PCI/AGP bus. This can increase performance
1513 of image write operations 2.5 times or more. Saying Y here creates a
1514 /proc/mtrr file which may be used to manipulate your processor's
1515 MTRRs. Typically the X server should use this.
1516
1517 This code has a reasonably generic interface so that similar
1518 control registers on other processors can be easily supported
1519 as well:
1520
1521 The Cyrix 6x86, 6x86MX and M II processors have Address Range
1522 Registers (ARRs) which provide a similar functionality to MTRRs. For
1523 these, the ARRs are used to emulate the MTRRs.
1524 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
1525 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
1526 write-combining. All of these processors are supported by this code
1527 and it makes sense to say Y here if you have one of them.
1528
1529 Saying Y here also fixes a problem with buggy SMP BIOSes which only
1530 set the MTRRs for the boot CPU and not for the secondary CPUs. This
1531 can lead to all sorts of problems, so it's good to say Y here.
1532
1533 You can safely say Y even if your machine doesn't have MTRRs, you'll
1534 just add about 9 KB to your kernel.
1535
Randy Dunlap7225e752008-07-26 17:54:22 -07001536 See <file:Documentation/x86/mtrr.txt> for more information.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001537
Yinghai Lu95ffa242008-04-29 03:52:33 -07001538config MTRR_SANITIZER
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001539 def_bool y
Yinghai Lu95ffa242008-04-29 03:52:33 -07001540 prompt "MTRR cleanup support"
1541 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001542 ---help---
Thomas Gleixneraba37282008-07-15 14:48:48 +02001543 Convert MTRR layout from continuous to discrete, so X drivers can
1544 add writeback entries.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001545
Thomas Gleixneraba37282008-07-15 14:48:48 +02001546 Can be disabled with disable_mtrr_cleanup on the kernel command line.
Matt LaPlante692105b2009-01-26 11:12:25 +01001547 The largest mtrr entry size for a continuous block can be set with
Thomas Gleixneraba37282008-07-15 14:48:48 +02001548 mtrr_chunk_size.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001549
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001550 If unsure, say Y.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001551
1552config MTRR_SANITIZER_ENABLE_DEFAULT
Yinghai Luf5098d62008-04-29 20:25:58 -07001553 int "MTRR cleanup enable value (0-1)"
1554 range 0 1
1555 default "0"
Yinghai Lu95ffa242008-04-29 03:52:33 -07001556 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001557 ---help---
Yinghai Luf5098d62008-04-29 20:25:58 -07001558 Enable mtrr cleanup default value
Yinghai Lu95ffa242008-04-29 03:52:33 -07001559
Yinghai Lu12031a62008-05-02 02:40:22 -07001560config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
1561 int "MTRR cleanup spare reg num (0-7)"
1562 range 0 7
1563 default "1"
1564 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001565 ---help---
Yinghai Lu12031a62008-05-02 02:40:22 -07001566 mtrr cleanup spare entries default, it can be changed via
Thomas Gleixneraba37282008-07-15 14:48:48 +02001567 mtrr_spare_reg_nr=N on the kernel command line.
Yinghai Lu12031a62008-05-02 02:40:22 -07001568
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001569config X86_PAT
Jan Beulich6fc108a2010-04-21 15:23:44 +01001570 def_bool y
David Rientjes6a108a12011-01-20 14:44:16 -08001571 prompt "x86 PAT support" if EXPERT
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001572 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001573 ---help---
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001574 Use PAT attributes to setup page level cache control.
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001575
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001576 PATs are the modern equivalents of MTRRs and are much more
1577 flexible than MTRRs.
1578
1579 Say N here if you see bootup problems (boot crash, boot hang,
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001580 spontaneous reboots) or a non-working video driver.
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001581
1582 If unsure, say Y.
1583
Venkatesh Pallipadi46cf98c2009-07-10 09:57:37 -07001584config ARCH_USES_PG_UNCACHED
1585 def_bool y
1586 depends on X86_PAT
1587
H. Peter Anvin628c6242011-07-31 13:59:29 -07001588config ARCH_RANDOM
1589 def_bool y
1590 prompt "x86 architectural random number generator" if EXPERT
1591 ---help---
1592 Enable the x86 architectural RDRAND instruction
1593 (Intel Bull Mountain technology) to generate random numbers.
1594 If supported, this is a high bandwidth, cryptographically
1595 secure hardware random number generator.
1596
H. Peter Anvin51ae4a22012-09-21 12:43:10 -07001597config X86_SMAP
1598 def_bool y
1599 prompt "Supervisor Mode Access Prevention" if EXPERT
1600 ---help---
1601 Supervisor Mode Access Prevention (SMAP) is a security
1602 feature in newer Intel processors. There is a small
1603 performance cost if this enabled and turned on; there is
1604 also a small increase in the kernel size if this is enabled.
1605
1606 If unsure, say Y.
1607
Dave Hansen72e9b5f2014-12-12 10:38:36 -08001608config X86_INTEL_MPX
1609 prompt "Intel MPX (Memory Protection Extensions)"
1610 def_bool n
1611 depends on CPU_SUP_INTEL
1612 ---help---
1613 MPX provides hardware features that can be used in
1614 conjunction with compiler-instrumented code to check
1615 memory references. It is designed to detect buffer
1616 overflow or underflow bugs.
1617
1618 This option enables running applications which are
1619 instrumented or otherwise use MPX. It does not use MPX
1620 itself inside the kernel or to protect the kernel
1621 against bad memory references.
1622
1623 Enabling this option will make the kernel larger:
1624 ~8k of kernel text and 36 bytes of data on a 64-bit
1625 defconfig. It adds a long to the 'mm_struct' which
1626 will increase the kernel memory overhead of each
1627 process and adds some branches to paths used during
1628 exec() and munmap().
1629
1630 For details, see Documentation/x86/intel_mpx.txt
1631
1632 If unsure, say N.
1633
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001634config EFI
Jan Beulich9ba16082008-10-15 22:01:38 -07001635 bool "EFI runtime service support"
Huang, Ying5b836832008-01-30 13:31:19 +01001636 depends on ACPI
Sergey Vlasovf6ce5002013-04-16 18:31:08 +04001637 select UCS2_STRING
Ard Biesheuvel022ee6c2014-06-26 12:09:05 +02001638 select EFI_RUNTIME_WRAPPERS
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001639 ---help---
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001640 This enables the kernel to use EFI runtime services that are
1641 available (such as the EFI variable services).
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001642
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001643 This option is only useful on systems that have EFI firmware.
1644 In addition, you should use the latest ELILO loader available
1645 at <http://elilo.sourceforge.net> in order to take advantage
1646 of EFI runtime services. However, even with this option, the
1647 resultant kernel should continue to boot on existing non-EFI
1648 platforms.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001649
Matt Fleming291f3632011-12-12 21:27:52 +00001650config EFI_STUB
1651 bool "EFI stub support"
Matt Flemingb16d8c22014-08-05 00:12:19 +01001652 depends on EFI && !X86_USE_3DNOW
Matt Fleming7b2a5832014-07-11 08:45:25 +01001653 select RELOCATABLE
Matt Fleming291f3632011-12-12 21:27:52 +00001654 ---help---
1655 This kernel feature allows a bzImage to be loaded directly
1656 by EFI firmware without the use of a bootloader.
1657
Roy Franz4172fe22013-09-22 15:45:25 -07001658 See Documentation/efi-stub.txt for more information.
Matt Fleming0c759662012-03-16 12:03:13 +00001659
Matt Fleming7d453ee2014-01-10 18:52:06 +00001660config EFI_MIXED
1661 bool "EFI mixed-mode support"
1662 depends on EFI_STUB && X86_64
1663 ---help---
1664 Enabling this feature allows a 64-bit kernel to be booted
1665 on a 32-bit firmware, provided that your CPU supports 64-bit
1666 mode.
1667
1668 Note that it is not possible to boot a mixed-mode enabled
1669 kernel via the EFI boot stub - a bootloader that supports
1670 the EFI handover protocol must be used.
1671
1672 If unsure, say N.
1673
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001674config SECCOMP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001675 def_bool y
1676 prompt "Enable seccomp to safely compute untrusted bytecode"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001677 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001678 This kernel feature is useful for number crunching applications
1679 that may need to compute untrusted bytecode during their
1680 execution. By using pipes or other transports made available to
1681 the process as file descriptors supporting the read/write
1682 syscalls, it's possible to isolate those applications in
1683 their own address space using seccomp. Once seccomp is
Alexey Dobriyan9c0bbee2008-09-09 11:01:31 +04001684 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001685 and the task is only allowed to execute a few safe syscalls
1686 defined by each seccomp mode.
1687
1688 If unsure, say Y. Only embedded should say N here.
1689
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001690source kernel/Kconfig.hz
1691
1692config KEXEC
1693 bool "kexec system call"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001694 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001695 kexec is a system call that implements the ability to shutdown your
1696 current kernel, and to start another kernel. It is like a reboot
1697 but it is independent of the system firmware. And like a reboot
1698 you can start any kernel with it, not just Linux.
1699
1700 The name comes from the similarity to the exec system call.
1701
1702 It is an ongoing process to be certain the hardware in a machine
1703 is properly shutdown, so do not be surprised if this code does not
Geert Uytterhoevenbf220692013-08-20 21:38:03 +02001704 initially work for you. As of this writing the exact hardware
1705 interface is strongly in flux, so no good recommendation can be
1706 made.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001707
Vivek Goyal74ca3172014-08-29 15:18:46 -07001708config KEXEC_FILE
1709 bool "kexec file based system call"
1710 select BUILD_BIN2C
1711 depends on KEXEC
1712 depends on X86_64
1713 depends on CRYPTO=y
1714 depends on CRYPTO_SHA256=y
1715 ---help---
1716 This is new version of kexec system call. This system call is
1717 file based and takes file descriptors as system call argument
1718 for kernel and initramfs as opposed to list of segments as
1719 accepted by previous system call.
1720
Vivek Goyal8e7d8382014-08-08 14:26:13 -07001721config KEXEC_VERIFY_SIG
1722 bool "Verify kernel signature during kexec_file_load() syscall"
Vivek Goyal74ca3172014-08-29 15:18:46 -07001723 depends on KEXEC_FILE
Vivek Goyal8e7d8382014-08-08 14:26:13 -07001724 ---help---
1725 This option makes kernel signature verification mandatory for
1726 kexec_file_load() syscall. If kernel is signature can not be
1727 verified, kexec_file_load() will fail.
1728
1729 This option enforces signature verification at generic level.
1730 One needs to enable signature verification for type of kernel
1731 image being loaded to make sure it works. For example, enable
1732 bzImage signature verification option to be able to load and
1733 verify signatures of bzImage. Otherwise kernel loading will fail.
1734
1735config KEXEC_BZIMAGE_VERIFY_SIG
1736 bool "Enable bzImage signature verification support"
1737 depends on KEXEC_VERIFY_SIG
1738 depends on SIGNED_PE_FILE_VERIFICATION
1739 select SYSTEM_TRUSTED_KEYRING
1740 ---help---
1741 Enable bzImage signature verification support.
1742
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001743config CRASH_DUMP
Pavel Machek04b69442008-08-14 17:16:50 +02001744 bool "kernel crash dumps"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001745 depends on X86_64 || (X86_32 && HIGHMEM)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001746 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001747 Generate crash dump after being started by kexec.
1748 This should be normally only set in special crash dump kernels
1749 which are loaded in the main kernel with kexec-tools into
1750 a specially reserved region and then later executed after
1751 a crash by kdump/kexec. The crash dump kernel must be compiled
1752 to a memory address not used by the main kernel or BIOS using
1753 PHYSICAL_START, or it must be built as a relocatable image
1754 (CONFIG_RELOCATABLE=y).
1755 For more details see Documentation/kdump/kdump.txt
1756
Huang Ying3ab83522008-07-25 19:45:07 -07001757config KEXEC_JUMP
Kees Cook6ea30382012-10-02 11:16:47 -07001758 bool "kexec jump"
Huang Yingfee7b0d2009-03-10 10:57:16 +08001759 depends on KEXEC && HIBERNATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001760 ---help---
Huang Ying89081d12008-07-25 19:45:10 -07001761 Jump between original kernel and kexeced kernel and invoke
1762 code in physical address mode via KEXEC
Huang Ying3ab83522008-07-25 19:45:07 -07001763
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001764config PHYSICAL_START
David Rientjes6a108a12011-01-20 14:44:16 -08001765 hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP)
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001766 default "0x1000000"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001767 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001768 This gives the physical address where the kernel is loaded.
1769
1770 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
1771 bzImage will decompress itself to above physical address and
1772 run from there. Otherwise, bzImage will run from the address where
1773 it has been loaded by the boot loader and will ignore above physical
1774 address.
1775
1776 In normal kdump cases one does not have to set/change this option
1777 as now bzImage can be compiled as a completely relocatable image
1778 (CONFIG_RELOCATABLE=y) and be used to load and run from a different
1779 address. This option is mainly useful for the folks who don't want
1780 to use a bzImage for capturing the crash dump and want to use a
1781 vmlinux instead. vmlinux is not relocatable hence a kernel needs
1782 to be specifically compiled to run from a specific memory area
1783 (normally a reserved region) and this option comes handy.
1784
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001785 So if you are using bzImage for capturing the crash dump,
1786 leave the value here unchanged to 0x1000000 and set
1787 CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux
1788 for capturing the crash dump change this value to start of
1789 the reserved region. In other words, it can be set based on
1790 the "X" value as specified in the "crashkernel=YM@XM"
1791 command line boot parameter passed to the panic-ed
1792 kernel. Please take a look at Documentation/kdump/kdump.txt
1793 for more details about crash dumps.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001794
1795 Usage of bzImage for capturing the crash dump is recommended as
1796 one does not have to build two kernels. Same kernel can be used
1797 as production kernel and capture kernel. Above option should have
1798 gone away after relocatable bzImage support is introduced. But it
1799 is present because there are users out there who continue to use
1800 vmlinux for dump capture. This option should go away down the
1801 line.
1802
1803 Don't change this unless you know what you are doing.
1804
1805config RELOCATABLE
H. Peter Anvin26717802009-05-07 14:19:34 -07001806 bool "Build a relocatable kernel"
1807 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001808 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001809 This builds a kernel image that retains relocation information
1810 so it can be loaded someplace besides the default 1MB.
1811 The relocations tend to make the kernel binary about 10% larger,
1812 but are discarded at runtime.
1813
1814 One use is for the kexec on panic case where the recovery kernel
1815 must live at a different physical address than the primary
1816 kernel.
1817
1818 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
1819 it has been loaded at and the compile time physical address
Kees Cook8ab38202013-10-10 17:18:14 -07001820 (CONFIG_PHYSICAL_START) is used as the minimum location.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001821
Kees Cook8ab38202013-10-10 17:18:14 -07001822config RANDOMIZE_BASE
1823 bool "Randomize the address of the kernel image"
1824 depends on RELOCATABLE
Kees Cook8ab38202013-10-10 17:18:14 -07001825 default n
1826 ---help---
1827 Randomizes the physical and virtual address at which the
1828 kernel image is decompressed, as a security feature that
1829 deters exploit attempts relying on knowledge of the location
1830 of kernel internals.
1831
Kees Cooka653f352013-11-11 14:28:39 -08001832 Entropy is generated using the RDRAND instruction if it is
1833 supported. If RDTSC is supported, it is used as well. If
1834 neither RDRAND nor RDTSC are supported, then randomness is
1835 read from the i8254 timer.
Kees Cook8ab38202013-10-10 17:18:14 -07001836
1837 The kernel will be offset by up to RANDOMIZE_BASE_MAX_OFFSET,
Kees Cooka653f352013-11-11 14:28:39 -08001838 and aligned according to PHYSICAL_ALIGN. Since the kernel is
1839 built using 2GiB addressing, and PHYSICAL_ALGIN must be at a
1840 minimum of 2MiB, only 10 bits of entropy is theoretically
1841 possible. At best, due to page table layouts, 64-bit can use
1842 9 bits of entropy and 32-bit uses 8 bits.
Kees Cook8ab38202013-10-10 17:18:14 -07001843
Kees Cookda2b6fb2013-12-10 12:27:45 -08001844 If unsure, say N.
1845
Kees Cook8ab38202013-10-10 17:18:14 -07001846config RANDOMIZE_BASE_MAX_OFFSET
Kees Cookda2b6fb2013-12-10 12:27:45 -08001847 hex "Maximum kASLR offset allowed" if EXPERT
Kees Cook8ab38202013-10-10 17:18:14 -07001848 depends on RANDOMIZE_BASE
Kees Cook6145cfe2013-10-10 17:18:18 -07001849 range 0x0 0x20000000 if X86_32
1850 default "0x20000000" if X86_32
1851 range 0x0 0x40000000 if X86_64
1852 default "0x40000000" if X86_64
Kees Cook8ab38202013-10-10 17:18:14 -07001853 ---help---
Kees Cookda2b6fb2013-12-10 12:27:45 -08001854 The lesser of RANDOMIZE_BASE_MAX_OFFSET and available physical
1855 memory is used to determine the maximal offset in bytes that will
1856 be applied to the kernel when kernel Address Space Layout
1857 Randomization (kASLR) is active. This must be a multiple of
1858 PHYSICAL_ALIGN.
Kees Cook6145cfe2013-10-10 17:18:18 -07001859
Kees Cookda2b6fb2013-12-10 12:27:45 -08001860 On 32-bit this is limited to 512MiB by page table layouts. The
1861 default is 512MiB.
Kees Cook6145cfe2013-10-10 17:18:18 -07001862
Kees Cookda2b6fb2013-12-10 12:27:45 -08001863 On 64-bit this is limited by how the kernel fixmap page table is
1864 positioned, so this cannot be larger than 1GiB currently. Without
1865 RANDOMIZE_BASE, there is a 512MiB to 1.5GiB split between kernel
1866 and modules. When RANDOMIZE_BASE_MAX_OFFSET is above 512MiB, the
1867 modules area will shrink to compensate, up to the current maximum
1868 1GiB to 1GiB split. The default is 1GiB.
1869
1870 If unsure, leave at the default value.
Kees Cook8ab38202013-10-10 17:18:14 -07001871
1872# Relocation on x86 needs some additional build support
H. Peter Anvin845adf72009-05-05 21:20:51 -07001873config X86_NEED_RELOCS
1874 def_bool y
Kees Cook8ab38202013-10-10 17:18:14 -07001875 depends on RANDOMIZE_BASE || (X86_32 && RELOCATABLE)
H. Peter Anvin845adf72009-05-05 21:20:51 -07001876
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001877config PHYSICAL_ALIGN
Kees Cooka0215062013-07-08 09:15:17 -07001878 hex "Alignment value to which kernel should be aligned"
Kees Cook8ab38202013-10-10 17:18:14 -07001879 default "0x200000"
Kees Cooka0215062013-07-08 09:15:17 -07001880 range 0x2000 0x1000000 if X86_32
1881 range 0x200000 0x1000000 if X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001882 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001883 This value puts the alignment restrictions on physical address
1884 where kernel is loaded and run from. Kernel is compiled for an
1885 address which meets above alignment restriction.
1886
1887 If bootloader loads the kernel at a non-aligned address and
1888 CONFIG_RELOCATABLE is set, kernel will move itself to nearest
1889 address aligned to above value and run from there.
1890
1891 If bootloader loads the kernel at a non-aligned address and
1892 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
1893 load address and decompress itself to the address it has been
1894 compiled for and run from there. The address for which kernel is
1895 compiled already meets above alignment restrictions. Hence the
1896 end result is that kernel runs from a physical address meeting
1897 above alignment restrictions.
1898
Kees Cooka0215062013-07-08 09:15:17 -07001899 On 32-bit this value must be a multiple of 0x2000. On 64-bit
1900 this value must be a multiple of 0x200000.
1901
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001902 Don't change this unless you know what you are doing.
1903
1904config HOTPLUG_CPU
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001905 bool "Support for hot-pluggable CPUs"
Stephen Rothwell40b31362013-05-21 13:49:35 +10001906 depends on SMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001907 ---help---
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001908 Say Y here to allow turning CPUs off and on. CPUs can be
1909 controlled through /sys/devices/system/cpu.
1910 ( Note: power management support will enable this option
1911 automatically on SMP systems. )
1912 Say N if you want to disable CPU hotplug.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001913
Fenghua Yu80aa1df2012-11-13 11:32:39 -08001914config BOOTPARAM_HOTPLUG_CPU0
1915 bool "Set default setting of cpu0_hotpluggable"
1916 default n
Kees Cook2c922cd2013-01-22 13:01:19 -08001917 depends on HOTPLUG_CPU
Fenghua Yu80aa1df2012-11-13 11:32:39 -08001918 ---help---
1919 Set whether default state of cpu0_hotpluggable is on or off.
1920
1921 Say Y here to enable CPU0 hotplug by default. If this switch
1922 is turned on, there is no need to give cpu0_hotplug kernel
1923 parameter and the CPU0 hotplug feature is enabled by default.
1924
1925 Please note: there are two known CPU0 dependencies if you want
1926 to enable the CPU0 hotplug feature either by this switch or by
1927 cpu0_hotplug kernel parameter.
1928
1929 First, resume from hibernate or suspend always starts from CPU0.
1930 So hibernate and suspend are prevented if CPU0 is offline.
1931
1932 Second dependency is PIC interrupts always go to CPU0. CPU0 can not
1933 offline if any interrupt can not migrate out of CPU0. There may
1934 be other CPU0 dependencies.
1935
1936 Please make sure the dependencies are under your control before
1937 you enable this feature.
1938
1939 Say N if you don't want to enable CPU0 hotplug feature by default.
1940 You still can enable the CPU0 hotplug feature at boot by kernel
1941 parameter cpu0_hotplug.
1942
Fenghua Yua71c8bc2012-11-13 11:32:51 -08001943config DEBUG_HOTPLUG_CPU0
1944 def_bool n
1945 prompt "Debug CPU0 hotplug"
Kees Cook2c922cd2013-01-22 13:01:19 -08001946 depends on HOTPLUG_CPU
Fenghua Yua71c8bc2012-11-13 11:32:51 -08001947 ---help---
1948 Enabling this option offlines CPU0 (if CPU0 can be offlined) as
1949 soon as possible and boots up userspace with CPU0 offlined. User
1950 can online CPU0 back after boot time.
1951
1952 To debug CPU0 hotplug, you need to enable CPU0 offline/online
1953 feature by either turning on CONFIG_BOOTPARAM_HOTPLUG_CPU0 during
1954 compilation or giving cpu0_hotplug kernel parameter at boot.
1955
1956 If unsure, say N.
1957
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001958config COMPAT_VDSO
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07001959 def_bool n
1960 prompt "Disable the 32-bit vDSO (needed for glibc 2.3.3)"
Roland McGrathaf65d642008-01-30 13:30:43 +01001961 depends on X86_32 || IA32_EMULATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001962 ---help---
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07001963 Certain buggy versions of glibc will crash if they are
1964 presented with a 32-bit vDSO that is not mapped at the address
1965 indicated in its segment table.
Randy Dunlape84446d2009-11-10 15:46:52 -08001966
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07001967 The bug was introduced by f866314b89d56845f55e6f365e18b31ec978ec3a
1968 and fixed by 3b3ddb4f7db98ec9e912ccdf54d35df4aa30e04a and
1969 49ad572a70b8aeb91e57483a11dd1b77e31c4468. Glibc 2.3.3 is
1970 the only released version with the bug, but OpenSUSE 9
1971 contains a buggy "glibc 2.3.2".
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001972
Andy Lutomirskib0b49f22014-03-13 16:01:26 -07001973 The symptom of the bug is that everything crashes on startup, saying:
1974 dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed!
1975
1976 Saying Y here changes the default value of the vdso32 boot
1977 option from 1 to 0, which turns off the 32-bit vDSO entirely.
1978 This works around the glibc bug but hurts performance.
1979
1980 If unsure, say N: if you are compiling your own kernel, you
1981 are unlikely to be using a buggy version of glibc.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001982
Tim Bird516cbf32008-08-12 12:52:36 -07001983config CMDLINE_BOOL
1984 bool "Built-in kernel command line"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001985 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001986 Allow for specifying boot arguments to the kernel at
1987 build time. On some systems (e.g. embedded ones), it is
1988 necessary or convenient to provide some or all of the
1989 kernel boot arguments with the kernel itself (that is,
1990 to not rely on the boot loader to provide them.)
1991
1992 To compile command line arguments into the kernel,
1993 set this option to 'Y', then fill in the
1994 the boot arguments in CONFIG_CMDLINE.
1995
1996 Systems with fully functional boot loaders (i.e. non-embedded)
1997 should leave this option set to 'N'.
1998
1999config CMDLINE
2000 string "Built-in kernel command string"
2001 depends on CMDLINE_BOOL
2002 default ""
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002003 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07002004 Enter arguments here that should be compiled into the kernel
2005 image and used at boot time. If the boot loader provides a
2006 command line at boot time, it is appended to this string to
2007 form the full kernel command line, when the system boots.
2008
2009 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
2010 change this behavior.
2011
2012 In most cases, the command line (whether built-in or provided
2013 by the boot loader) should specify the device for the root
2014 file system.
2015
2016config CMDLINE_OVERRIDE
2017 bool "Built-in command line overrides boot loader arguments"
Tim Bird516cbf32008-08-12 12:52:36 -07002018 depends on CMDLINE_BOOL
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002019 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07002020 Set this option to 'Y' to have the kernel ignore the boot loader
2021 command line, and use ONLY the built-in command line.
2022
2023 This is used to work around broken boot loaders. This should
2024 be set to 'N' under normal conditions.
2025
Sam Ravnborg506f1d02007-11-09 21:56:54 +01002026endmenu
2027
2028config ARCH_ENABLE_MEMORY_HOTPLUG
2029 def_bool y
2030 depends on X86_64 || (X86_32 && HIGHMEM)
2031
Gary Hade35551052008-10-31 10:52:03 -07002032config ARCH_ENABLE_MEMORY_HOTREMOVE
2033 def_bool y
2034 depends on MEMORY_HOTPLUG
2035
Lee Schermerhorne534c7c2010-05-26 14:44:58 -07002036config USE_PERCPU_NUMA_NODE_ID
Tejun Heo645a7912011-01-23 14:37:40 +01002037 def_bool y
Lee Schermerhorne534c7c2010-05-26 14:44:58 -07002038 depends on NUMA
2039
Kirill A. Shutemov94918462013-11-14 14:31:10 -08002040config ARCH_ENABLE_SPLIT_PMD_PTLOCK
2041 def_bool y
2042 depends on X86_64 || X86_PAE
2043
Naoya Horiguchic177c812014-06-04 16:05:35 -07002044config ARCH_ENABLE_HUGEPAGE_MIGRATION
2045 def_bool y
2046 depends on X86_64 && HUGETLB_PAGE && MIGRATION
2047
Bjorn Helgaasda85f862008-11-05 13:37:27 -06002048menu "Power management and ACPI options"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002049
2050config ARCH_HIBERNATION_HEADER
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002051 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002052 depends on X86_64 && HIBERNATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002053
2054source "kernel/power/Kconfig"
2055
2056source "drivers/acpi/Kconfig"
2057
Feng Tangefafc8b2009-08-14 15:23:29 -04002058source "drivers/sfi/Kconfig"
2059
Andi Kleena6b68072008-01-30 13:32:49 +01002060config X86_APM_BOOT
Jan Beulich6fc108a2010-04-21 15:23:44 +01002061 def_bool y
Paul Bolle282e5aa2011-11-17 11:41:31 +01002062 depends on APM
Andi Kleena6b68072008-01-30 13:32:49 +01002063
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002064menuconfig APM
2065 tristate "APM (Advanced Power Management) BIOS support"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02002066 depends on X86_32 && PM_SLEEP
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002067 ---help---
2068 APM is a BIOS specification for saving power using several different
2069 techniques. This is mostly useful for battery powered laptops with
2070 APM compliant BIOSes. If you say Y here, the system time will be
2071 reset after a RESUME operation, the /proc/apm device will provide
2072 battery status information, and user-space programs will receive
2073 notification of APM "events" (e.g. battery status change).
2074
2075 If you select "Y" here, you can disable actual use of the APM
2076 BIOS by passing the "apm=off" option to the kernel at boot time.
2077
2078 Note that the APM support is almost completely disabled for
2079 machines with more than one CPU.
2080
2081 In order to use APM, you will need supporting software. For location
Michael Witten2dc98fd2011-07-08 21:11:16 +00002082 and more information, read <file:Documentation/power/apm-acpi.txt>
2083 and the Battery Powered Linux mini-HOWTO, available from
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002084 <http://www.tldp.org/docs.html#howto>.
2085
2086 This driver does not spin down disk drives (see the hdparm(8)
2087 manpage ("man 8 hdparm") for that), and it doesn't turn off
2088 VESA-compliant "green" monitors.
2089
2090 This driver does not support the TI 4000M TravelMate and the ACER
2091 486/DX4/75 because they don't have compliant BIOSes. Many "green"
2092 desktop machines also don't have compliant BIOSes, and this driver
2093 may cause those machines to panic during the boot phase.
2094
2095 Generally, if you don't have a battery in your machine, there isn't
2096 much point in using this driver and you should say N. If you get
2097 random kernel OOPSes or reboots that don't seem to be related to
2098 anything, try disabling/enabling this option (or disabling/enabling
2099 APM in your BIOS).
2100
2101 Some other things you should try when experiencing seemingly random,
2102 "weird" problems:
2103
2104 1) make sure that you have enough swap space and that it is
2105 enabled.
2106 2) pass the "no-hlt" option to the kernel
2107 3) switch on floating point emulation in the kernel and pass
2108 the "no387" option to the kernel
2109 4) pass the "floppy=nodma" option to the kernel
2110 5) pass the "mem=4M" option to the kernel (thereby disabling
2111 all but the first 4 MB of RAM)
2112 6) make sure that the CPU is not over clocked.
2113 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
2114 8) disable the cache from your BIOS settings
2115 9) install a fan for the video card or exchange video RAM
2116 10) install a better fan for the CPU
2117 11) exchange RAM chips
2118 12) exchange the motherboard.
2119
2120 To compile this driver as a module, choose M here: the
2121 module will be called apm.
2122
2123if APM
2124
2125config APM_IGNORE_USER_SUSPEND
2126 bool "Ignore USER SUSPEND"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002127 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002128 This option will ignore USER SUSPEND requests. On machines with a
2129 compliant APM BIOS, you want to say N. However, on the NEC Versa M
2130 series notebooks, it is necessary to say Y because of a BIOS bug.
2131
2132config APM_DO_ENABLE
2133 bool "Enable PM at boot time"
2134 ---help---
2135 Enable APM features at boot time. From page 36 of the APM BIOS
2136 specification: "When disabled, the APM BIOS does not automatically
2137 power manage devices, enter the Standby State, enter the Suspend
2138 State, or take power saving steps in response to CPU Idle calls."
2139 This driver will make CPU Idle calls when Linux is idle (unless this
2140 feature is turned off -- see "Do CPU IDLE calls", below). This
2141 should always save battery power, but more complicated APM features
2142 will be dependent on your BIOS implementation. You may need to turn
2143 this option off if your computer hangs at boot time when using APM
2144 support, or if it beeps continuously instead of suspending. Turn
2145 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
2146 T400CDT. This is off by default since most machines do fine without
2147 this feature.
2148
2149config APM_CPU_IDLE
Len Browndd8af072013-02-09 21:10:04 -05002150 depends on CPU_IDLE
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002151 bool "Make CPU Idle calls when idle"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002152 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002153 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
2154 On some machines, this can activate improved power savings, such as
2155 a slowed CPU clock rate, when the machine is idle. These idle calls
2156 are made after the idle loop has run for some length of time (e.g.,
2157 333 mS). On some machines, this will cause a hang at boot time or
2158 whenever the CPU becomes idle. (On machines with more than one CPU,
2159 this option does nothing.)
2160
2161config APM_DISPLAY_BLANK
2162 bool "Enable console blanking using APM"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002163 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002164 Enable console blanking using the APM. Some laptops can use this to
2165 turn off the LCD backlight when the screen blanker of the Linux
2166 virtual console blanks the screen. Note that this is only used by
2167 the virtual console screen blanker, and won't turn off the backlight
2168 when using the X Window system. This also doesn't have anything to
2169 do with your VESA-compliant power-saving monitor. Further, this
2170 option doesn't work for all laptops -- it might not turn off your
2171 backlight at all, or it might print a lot of errors to the console,
2172 especially if you are using gpm.
2173
2174config APM_ALLOW_INTS
2175 bool "Allow interrupts during APM BIOS calls"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002176 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002177 Normally we disable external interrupts while we are making calls to
2178 the APM BIOS as a measure to lessen the effects of a badly behaving
2179 BIOS implementation. The BIOS should reenable interrupts if it
2180 needs to. Unfortunately, some BIOSes do not -- especially those in
2181 many of the newer IBM Thinkpads. If you experience hangs when you
2182 suspend, try setting this to Y. Otherwise, say N.
2183
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002184endif # APM
2185
Dave Jonesbb0a56e2011-05-19 18:51:07 -04002186source "drivers/cpufreq/Kconfig"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002187
2188source "drivers/cpuidle/Kconfig"
2189
Andy Henroid27471fd2008-10-09 11:45:22 -07002190source "drivers/idle/Kconfig"
2191
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002192endmenu
2193
2194
2195menu "Bus options (PCI etc.)"
2196
2197config PCI
Ingo Molnar1ac97012008-05-19 14:10:14 +02002198 bool "PCI support"
Adrian Bunk1c858082008-01-30 13:32:32 +01002199 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002200 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002201 Find out whether you have a PCI motherboard. PCI is the name of a
2202 bus system, i.e. the way the CPU talks to the other stuff inside
2203 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
2204 VESA. If you have PCI, say Y, otherwise N.
2205
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002206choice
2207 prompt "PCI access mode"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02002208 depends on X86_32 && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002209 default PCI_GOANY
2210 ---help---
2211 On PCI systems, the BIOS can be used to detect the PCI devices and
2212 determine their configuration. However, some old PCI motherboards
2213 have BIOS bugs and may crash if this is done. Also, some embedded
2214 PCI-based systems don't have any BIOS at all. Linux can also try to
2215 detect the PCI hardware directly without using the BIOS.
2216
2217 With this option, you can specify how Linux should detect the
2218 PCI devices. If you choose "BIOS", the BIOS will be used,
2219 if you choose "Direct", the BIOS won't be used, and if you
2220 choose "MMConfig", then PCI Express MMCONFIG will be used.
2221 If you choose "Any", the kernel will try MMCONFIG, then the
2222 direct access method and falls back to the BIOS if that doesn't
2223 work. If unsure, go with the default, which is "Any".
2224
2225config PCI_GOBIOS
2226 bool "BIOS"
2227
2228config PCI_GOMMCONFIG
2229 bool "MMConfig"
2230
2231config PCI_GODIRECT
2232 bool "Direct"
2233
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002234config PCI_GOOLPC
Daniel Drake76fb6572010-09-23 17:28:04 +01002235 bool "OLPC XO-1"
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002236 depends on OLPC
2237
Andres Salomon2bdd1b02008-06-05 14:14:41 -07002238config PCI_GOANY
2239 bool "Any"
2240
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002241endchoice
2242
2243config PCI_BIOS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002244 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02002245 depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002246
2247# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
2248config PCI_DIRECT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002249 def_bool y
Shaohua Li0aba4962011-05-27 14:59:39 +08002250 depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC || PCI_GOMMCONFIG))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002251
2252config PCI_MMCONFIG
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002253 def_bool y
Feng Tang5f0db7a2009-08-14 15:37:50 -04002254 depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002255
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002256config PCI_OLPC
Andres Salomon2bdd1b02008-06-05 14:14:41 -07002257 def_bool y
2258 depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002259
Alex Nixonb5401a92010-03-18 16:31:34 -04002260config PCI_XEN
2261 def_bool y
2262 depends on PCI && XEN
2263 select SWIOTLB_XEN
2264
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002265config PCI_DOMAINS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002266 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002267 depends on PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002268
2269config PCI_MMCONFIG
2270 bool "Support mmconfig PCI config space access"
2271 depends on X86_64 && PCI && ACPI
2272
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07002273config PCI_CNB20LE_QUIRK
David Rientjes6a108a12011-01-20 14:44:16 -08002274 bool "Read CNB20LE Host Bridge Windows" if EXPERT
Kees Cook6ea30382012-10-02 11:16:47 -07002275 depends on PCI
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07002276 help
2277 Read the PCI windows out of the CNB20LE host bridge. This allows
2278 PCI hotplug to work on systems with the CNB20LE chipset which do
2279 not have ACPI.
2280
Bjorn Helgaas64a5fed2011-01-06 10:12:30 -07002281 There's no public spec for this chipset, and this functionality
2282 is known to be incomplete.
2283
2284 You should say N unless you know you need this.
2285
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002286source "drivers/pci/pcie/Kconfig"
2287
2288source "drivers/pci/Kconfig"
2289
David Rientjes1c00f012011-03-22 16:34:59 -07002290# x86_64 have no ISA slots, but can have ISA-style DMA.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002291config ISA_DMA_API
David Rientjes1c00f012011-03-22 16:34:59 -07002292 bool "ISA-style DMA support" if (X86_64 && EXPERT)
2293 default y
2294 help
2295 Enables ISA-style DMA support for devices requiring such controllers.
2296 If unsure, say Y.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002297
2298if X86_32
2299
2300config ISA
2301 bool "ISA support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002302 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002303 Find out whether you have ISA slots on your motherboard. ISA is the
2304 name of a bus system, i.e. the way the CPU talks to the other stuff
2305 inside your box. Other bus systems are PCI, EISA, MicroChannel
2306 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
2307 newer boards don't support it. If you have ISA, say Y, otherwise N.
2308
2309config EISA
2310 bool "EISA support"
2311 depends on ISA
2312 ---help---
2313 The Extended Industry Standard Architecture (EISA) bus was
2314 developed as an open alternative to the IBM MicroChannel bus.
2315
2316 The EISA bus provided some of the features of the IBM MicroChannel
2317 bus while maintaining backward compatibility with cards made for
2318 the older ISA bus. The EISA bus saw limited use between 1988 and
2319 1995 when it was made obsolete by the PCI bus.
2320
2321 Say Y here if you are building a kernel for an EISA-based machine.
2322
2323 Otherwise, say N.
2324
2325source "drivers/eisa/Kconfig"
2326
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002327config SCx200
2328 tristate "NatSemi SCx200 support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002329 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002330 This provides basic support for National Semiconductor's
2331 (now AMD's) Geode processors. The driver probes for the
2332 PCI-IDs of several on-chip devices, so its a good dependency
2333 for other scx200_* drivers.
2334
2335 If compiled as a module, the driver is named scx200.
2336
2337config SCx200HR_TIMER
2338 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
John Stultz592913e2010-07-13 17:56:20 -07002339 depends on SCx200
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002340 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002341 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002342 This driver provides a clocksource built upon the on-chip
2343 27MHz high-resolution timer. Its also a workaround for
2344 NSC Geode SC-1100's buggy TSC, which loses time when the
2345 processor goes idle (as is done by the scheduler). The
2346 other workaround is idle=poll boot option.
2347
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002348config OLPC
2349 bool "One Laptop Per Child support"
Thomas Gleixner54008972011-02-23 09:50:15 +01002350 depends on !X86_PAE
Andres Salomon3c554942009-12-14 18:00:36 -08002351 select GPIOLIB
Thomas Gleixnerdc3119e72011-02-23 10:08:31 +01002352 select OF
Daniel Drake45bb1672011-03-13 15:10:17 +00002353 select OF_PROMTREE
Grant Likelyb4e51852011-12-16 15:50:17 -07002354 select IRQ_DOMAIN
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002355 ---help---
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002356 Add support for detecting the unique features of the OLPC
2357 XO hardware.
2358
Daniel Drakea3128582011-06-25 17:34:10 +01002359config OLPC_XO1_PM
2360 bool "OLPC XO-1 Power Management"
Daniel Drake97c4cb72011-06-25 17:34:11 +01002361 depends on OLPC && MFD_CS5535 && PM_SLEEP
Daniel Drakea3128582011-06-25 17:34:10 +01002362 select MFD_CORE
Daniel Drakebf1ebf02010-10-10 10:40:32 +01002363 ---help---
Daniel Drake97c4cb72011-06-25 17:34:11 +01002364 Add support for poweroff and suspend of the OLPC XO-1 laptop.
Daniel Drakebf1ebf02010-10-10 10:40:32 +01002365
Daniel Drakecfee9592011-06-25 17:34:17 +01002366config OLPC_XO1_RTC
2367 bool "OLPC XO-1 Real Time Clock"
2368 depends on OLPC_XO1_PM && RTC_DRV_CMOS
2369 ---help---
2370 Add support for the XO-1 real time clock, which can be used as a
2371 programmable wakeup source.
2372
Daniel Drake7feda8e2011-06-25 17:34:12 +01002373config OLPC_XO1_SCI
2374 bool "OLPC XO-1 SCI extras"
Daniel Draked8d01a62011-07-24 18:33:21 +01002375 depends on OLPC && OLPC_XO1_PM
Randy Dunlaped8e47f2012-12-18 12:22:17 -08002376 depends on INPUT=y
Daniel Draked8d01a62011-07-24 18:33:21 +01002377 select POWER_SUPPLY
Daniel Drake7feda8e2011-06-25 17:34:12 +01002378 select GPIO_CS5535
2379 select MFD_CORE
2380 ---help---
2381 Add support for SCI-based features of the OLPC XO-1 laptop:
Daniel Drake7bc74b32011-06-25 17:34:14 +01002382 - EC-driven system wakeups
Daniel Drake7feda8e2011-06-25 17:34:12 +01002383 - Power button
Daniel Drake7bc74b32011-06-25 17:34:14 +01002384 - Ebook switch
Daniel Drake2cf2bae2011-06-25 17:34:15 +01002385 - Lid switch
Daniel Drakee1040ac2011-06-25 17:34:16 +01002386 - AC adapter status updates
2387 - Battery status updates
Daniel Drake7feda8e2011-06-25 17:34:12 +01002388
Daniel Drakea0f30f52011-06-25 17:34:18 +01002389config OLPC_XO15_SCI
2390 bool "OLPC XO-1.5 SCI extras"
Daniel Draked8d01a62011-07-24 18:33:21 +01002391 depends on OLPC && ACPI
2392 select POWER_SUPPLY
Daniel Drakea0f30f52011-06-25 17:34:18 +01002393 ---help---
2394 Add support for SCI-based features of the OLPC XO-1.5 laptop:
2395 - EC-driven system wakeups
2396 - AC adapter status updates
2397 - Battery status updates
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002398
Ed Wildgoosed4f3e352011-09-20 14:00:12 -07002399config ALIX
2400 bool "PCEngines ALIX System Support (LED setup)"
2401 select GPIOLIB
2402 ---help---
2403 This option enables system support for the PCEngines ALIX.
2404 At present this just sets up LEDs for GPIO control on
2405 ALIX2/3/6 boards. However, other system specific setup should
2406 get added here.
2407
2408 Note: You must still enable the drivers for GPIO and LED support
2409 (GPIO_CS5535 & LEDS_GPIO) to actually use the LEDs
2410
2411 Note: You have to set alix.force=1 for boards with Award BIOS.
2412
Philip Prindevilleda4e3302012-03-05 15:05:15 -08002413config NET5501
2414 bool "Soekris Engineering net5501 System Support (LEDS, GPIO, etc)"
2415 select GPIOLIB
2416 ---help---
2417 This option enables system support for the Soekris Engineering net5501.
2418
Philip A. Prindeville31970592012-01-14 01:45:39 -07002419config GEOS
2420 bool "Traverse Technologies GEOS System Support (LEDS, GPIO, etc)"
2421 select GPIOLIB
2422 depends on DMI
2423 ---help---
2424 This option enables system support for the Traverse Technologies GEOS.
2425
Vivien Didelot7d029122013-01-04 16:18:14 -05002426config TS5500
2427 bool "Technologic Systems TS-5500 platform support"
2428 depends on MELAN
2429 select CHECK_SIGNATURE
2430 select NEW_LEDS
2431 select LEDS_CLASS
2432 ---help---
2433 This option enables system support for the Technologic Systems TS-5500.
2434
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002435endif # X86_32
2436
Andreas Herrmann23ac4ae2010-09-17 18:03:43 +02002437config AMD_NB
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002438 def_bool y
Borislav Petkov0e152cd2010-03-12 15:43:03 +01002439 depends on CPU_SUP_AMD && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002440
2441source "drivers/pcmcia/Kconfig"
2442
2443source "drivers/pci/hotplug/Kconfig"
2444
Alexandre Bounine388b78a2011-03-23 16:43:03 -07002445config RAPIDIO
Alexandre Bouninefdf90ab2013-07-03 15:08:56 -07002446 tristate "RapidIO support"
Alexandre Bounine388b78a2011-03-23 16:43:03 -07002447 depends on PCI
2448 default n
2449 help
Alexandre Bouninefdf90ab2013-07-03 15:08:56 -07002450 If enabled this option will include drivers and the core
Alexandre Bounine388b78a2011-03-23 16:43:03 -07002451 infrastructure code to support RapidIO interconnect devices.
2452
2453source "drivers/rapidio/Kconfig"
2454
David Herrmanne3263ab2013-08-02 14:05:22 +02002455config X86_SYSFB
2456 bool "Mark VGA/VBE/EFI FB as generic system framebuffer"
2457 help
2458 Firmwares often provide initial graphics framebuffers so the BIOS,
2459 bootloader or kernel can show basic video-output during boot for
2460 user-guidance and debugging. Historically, x86 used the VESA BIOS
2461 Extensions and EFI-framebuffers for this, which are mostly limited
2462 to x86.
2463 This option, if enabled, marks VGA/VBE/EFI framebuffers as generic
2464 framebuffers so the new generic system-framebuffer drivers can be
2465 used on x86. If the framebuffer is not compatible with the generic
2466 modes, it is adverticed as fallback platform framebuffer so legacy
2467 drivers like efifb, vesafb and uvesafb can pick it up.
2468 If this option is not selected, all system framebuffers are always
2469 marked as fallback platform framebuffers as usual.
2470
2471 Note: Legacy fbdev drivers, including vesafb, efifb, uvesafb, will
2472 not be able to pick up generic system framebuffers if this option
2473 is selected. You are highly encouraged to enable simplefb as
2474 replacement if you select this option. simplefb can correctly deal
2475 with generic system framebuffers. But you should still keep vesafb
2476 and others enabled as fallback if a system framebuffer is
2477 incompatible with simplefb.
2478
2479 If unsure, say Y.
2480
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002481endmenu
2482
2483
2484menu "Executable file formats / Emulations"
2485
2486source "fs/Kconfig.binfmt"
2487
2488config IA32_EMULATION
2489 bool "IA32 Emulation"
2490 depends on X86_64
Randy Dunlapd1603992013-06-18 12:33:40 -07002491 select BINFMT_ELF
Roland McGratha97f52e2008-01-30 13:31:55 +01002492 select COMPAT_BINFMT_ELF
Catalin Marinasaf1839e2012-10-08 16:28:08 -07002493 select HAVE_UID16
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002494 ---help---
H. J. Lu5fd92e62012-02-19 10:40:03 -08002495 Include code to run legacy 32-bit programs under a
2496 64-bit kernel. You should likely turn this on, unless you're
2497 100% sure that you don't have any 32-bit programs left.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002498
2499config IA32_AOUT
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002500 tristate "IA32 a.out support"
2501 depends on IA32_EMULATION
2502 ---help---
2503 Support old a.out binaries in the 32bit emulation.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002504
H. Peter Anvin0bf62762012-02-27 14:09:10 -08002505config X86_X32
Kees Cook6ea30382012-10-02 11:16:47 -07002506 bool "x32 ABI for 64-bit mode"
2507 depends on X86_64 && IA32_EMULATION
H. J. Lu5fd92e62012-02-19 10:40:03 -08002508 ---help---
2509 Include code to run binaries for the x32 native 32-bit ABI
2510 for 64-bit processors. An x32 process gets access to the
2511 full 64-bit register file and wide data path while leaving
2512 pointers at 32 bits for smaller memory footprint.
2513
2514 You will need a recent binutils (2.22 or later) with
2515 elf32_x86_64 support enabled to compile a kernel with this
2516 option set.
2517
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002518config COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002519 def_bool y
H. Peter Anvin0bf62762012-02-27 14:09:10 -08002520 depends on IA32_EMULATION || X86_X32
Chris Metcalf48b25c42012-03-15 13:13:38 -04002521 select ARCH_WANT_OLD_COMPAT_IPC
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002522
Jan Beulich3120e252012-09-10 12:41:45 +01002523if COMPAT
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002524config COMPAT_FOR_U64_ALIGNMENT
Jan Beulich3120e252012-09-10 12:41:45 +01002525 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002526
2527config SYSVIPC_COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002528 def_bool y
Jan Beulich3120e252012-09-10 12:41:45 +01002529 depends on SYSVIPC
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002530
David Howellsee009e4a02011-03-07 15:06:20 +00002531config KEYS_COMPAT
Jan Beulich3120e252012-09-10 12:41:45 +01002532 def_bool y
2533 depends on KEYS
2534endif
David Howellsee009e4a02011-03-07 15:06:20 +00002535
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002536endmenu
2537
2538
Keith Packarde5beae12008-11-03 18:21:45 +01002539config HAVE_ATOMIC_IOMAP
2540 def_bool y
2541 depends on X86_32
2542
Alessandro Rubini4692d772012-04-04 19:39:58 +02002543config X86_DEV_DMA_OPS
2544 bool
Alessandro Rubini83125a32012-04-04 19:40:21 +02002545 depends on X86_64 || STA2X11
Alessandro Rubini4692d772012-04-04 19:39:58 +02002546
Alessandro Rubinif7219a52012-04-04 19:40:10 +02002547config X86_DMA_REMAP
2548 bool
Alessandro Rubini83125a32012-04-04 19:40:21 +02002549 depends on STA2X11
Alessandro Rubinif7219a52012-04-04 19:40:10 +02002550
Li, Aubrey93e5ead2014-06-30 14:08:42 +08002551config PMC_ATOM
2552 def_bool y
2553 depends on PCI
2554
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002555source "net/Kconfig"
2556
2557source "drivers/Kconfig"
2558
2559source "drivers/firmware/Kconfig"
2560
2561source "fs/Kconfig"
2562
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002563source "arch/x86/Kconfig.debug"
2564
2565source "security/Kconfig"
2566
2567source "crypto/Kconfig"
2568
Avi Kivityedf88412007-12-16 11:02:48 +02002569source "arch/x86/kvm/Kconfig"
2570
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002571source "lib/Kconfig"