blob: a92572de2ac119e0156c6fe46e7d1ec81491606d [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
Stephen Boyd446f24d2013-04-30 15:28:42 -070024 select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
David Woodhousee17c6d52008-06-17 12:19:34 +010025 select HAVE_AOUT if X86_32
Ingo Molnara5574cf2008-05-05 23:19:50 +020026 select HAVE_UNSTABLE_SCHED_CLOCK
Peter Zijlstracbee9f82012-10-25 14:16:43 +020027 select ARCH_SUPPORTS_NUMA_BALANCING
28 select ARCH_WANTS_PROT_NUMA_PROT_NONE
Sam Ravnborgec7748b2008-02-09 10:46:40 +010029 select HAVE_IDE
Mathieu Desnoyers42d4b832008-02-02 15:10:34 -050030 select HAVE_OPROFILE
Ralf Baechle8761f1a2011-06-01 19:05:09 +010031 select HAVE_PCSPKR_PLATFORM
Peter Zijlstracc2067a2010-11-16 21:49:01 +010032 select HAVE_PERF_EVENTS
Rik van Riel28b2ee22008-07-23 21:27:05 -070033 select HAVE_IOREMAP_PROT
Mathieu Desnoyers3f550092008-02-02 15:10:35 -050034 select HAVE_KPROBES
Yinghai Lu72d7c3b2010-08-25 13:39:17 -070035 select HAVE_MEMBLOCK
Tejun Heo0608f702011-07-14 11:44:23 +020036 select HAVE_MEMBLOCK_NODE_MAP
Tejun Heoc378ddd2011-07-14 11:46:03 +020037 select ARCH_DISCARD_MEMBLOCK
Ingo Molnar1f972762008-07-26 13:52:50 +020038 select ARCH_WANT_OPTIONAL_GPIOLIB
Ingo Molnarda4276b2009-01-07 11:05:10 +010039 select ARCH_WANT_FRAME_POINTERS
FUJITA Tomonori7c095e42009-06-17 16:28:12 -070040 select HAVE_DMA_ATTRS
Marek Szyprowski0a2b9a62011-12-29 13:09:51 +010041 select HAVE_DMA_CONTIGUOUS if !SWIOTLB
Ananth N Mavinakayanahalli9edddaa2008-03-04 14:28:37 -080042 select HAVE_KRETPROBES
Masami Hiramatsuc0f7ac32010-02-25 08:34:46 -050043 select HAVE_OPTPROBES
Masami Hiramatsue7dbfe32012-09-28 17:15:20 +090044 select HAVE_KPROBES_ON_FTRACE
Steven Rostedte4b2b882008-08-14 15:45:11 -040045 select HAVE_FTRACE_MCOUNT_RECORD
Steven Rostedtd57c5d52011-02-09 13:32:18 -050046 select HAVE_FENTRY if X86_64
Steven Rostedtcf4db252010-10-14 23:32:44 -040047 select HAVE_C_RECORDMCOUNT
Steven Rostedt677aa9f2008-05-17 00:01:36 -040048 select HAVE_DYNAMIC_FTRACE
Masami Hiramatsu06aeaae2012-09-28 17:15:17 +090049 select HAVE_DYNAMIC_FTRACE_WITH_REGS
Steven Rostedt606576c2008-10-06 19:06:12 -040050 select HAVE_FUNCTION_TRACER
Frederic Weisbecker48d68b22008-12-02 00:20:39 +010051 select HAVE_FUNCTION_GRAPH_TRACER
Steven Rostedt71e308a2009-06-18 12:45:08 -040052 select HAVE_FUNCTION_GRAPH_FP_TEST
Steven Rostedt60a7ecf2008-11-05 16:05:44 -050053 select HAVE_FUNCTION_TRACE_MCOUNT_TEST
Josh Stone66700002009-08-24 14:43:11 -070054 select HAVE_SYSCALL_TRACEPOINTS
Catalin Marinas7ac57a82012-10-08 16:28:16 -070055 select SYSCTL_EXCEPTION_TRACE
Ingo Molnare0ec9482009-01-27 17:01:14 +010056 select HAVE_KVM
Ingo Molnar49793b02009-01-27 17:02:29 +010057 select HAVE_ARCH_KGDB
Roland McGrath99bbc4b2008-04-20 14:35:12 -070058 select HAVE_ARCH_TRACEHOOK
Dmitry Baryshkov323ec002008-06-29 14:19:31 +040059 select HAVE_GENERIC_DMA_COHERENT if X86_32
Johannes Berg58340a02008-07-25 01:45:33 -070060 select HAVE_EFFICIENT_UNALIGNED_ACCESS
Török Edwin8d264872008-11-23 12:39:08 +020061 select USER_STACKTRACE_SUPPORT
Heiko Carstensf850c30c2010-02-10 17:25:17 +010062 select HAVE_REGS_AND_STACK_ACCESS_API
Joerg Roedel2118d0c2009-01-09 15:13:15 +010063 select HAVE_DMA_API_DEBUG
H. Peter Anvin2e9f3bd2009-01-04 15:41:25 -080064 select HAVE_KERNEL_GZIP
65 select HAVE_KERNEL_BZIP2
66 select HAVE_KERNEL_LZMA
Lasse Collin30314802011-01-12 17:01:24 -080067 select HAVE_KERNEL_XZ
Albin Tonnerre13510992010-01-08 14:42:45 -080068 select HAVE_KERNEL_LZO
Kyungsik Leef9b493a2013-07-08 16:01:48 -070069 select HAVE_KERNEL_LZ4
K.Prasad0067f122009-06-01 23:43:57 +053070 select HAVE_HW_BREAKPOINT
Frederic Weisbecker01027522010-04-11 18:55:56 +020071 select HAVE_MIXED_BREAKPOINTS_REGS
Frederic Weisbecker99e8c5a2009-12-17 01:33:54 +010072 select PERF_EVENTS
Frederic Weisbeckerc01d4322010-05-15 22:57:48 +020073 select HAVE_PERF_EVENTS_NMI
Jiri Olsac5e63192012-08-07 15:20:36 +020074 select HAVE_PERF_REGS
Jiri Olsac5ebced2012-08-07 15:20:40 +020075 select HAVE_PERF_USER_STACK_DUMP
Catalin Marinasb69ec422012-10-08 16:28:11 -070076 select HAVE_DEBUG_KMEMLEAK
Frederic Weisbecker99e8c5a2009-12-17 01:33:54 +010077 select ANON_INODES
H. Peter Anvineb068e72012-11-28 11:50:23 -080078 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
79 select HAVE_CMPXCHG_LOCAL
Heiko Carstens25654092012-01-12 17:17:33 -080080 select HAVE_CMPXCHG_DOUBLE
Pekka Enberg0a4af3b2009-02-26 21:38:56 +020081 select HAVE_ARCH_KMEMCHECK
Avi Kivity7c68af62009-09-19 09:40:22 +030082 select HAVE_USER_RETURN_NOTIFIER
David Daneye39f5602012-01-10 15:10:21 -080083 select ARCH_BINFMT_ELF_RANDOMIZE_PIE
Steven Rostedt46eb3b62010-09-22 23:10:23 -040084 select HAVE_ARCH_JUMP_LABEL
Catalin Marinas74634492012-07-30 14:41:09 -070085 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
Yinghai Lu141d55e2011-10-12 11:53:17 -070086 select SPARSE_IRQ
Jan Beulichc49aa5b2011-03-08 09:24:26 +000087 select GENERIC_FIND_FIRST_BIT
Thomas Gleixner3bb98082010-09-27 12:46:02 +000088 select GENERIC_IRQ_PROBE
89 select GENERIC_PENDING_IRQ if SMP
Thomas Gleixner517e4982010-12-16 17:59:57 +010090 select GENERIC_IRQ_SHOW
Martin Schwidefskyd1748302011-08-23 15:29:42 +020091 select GENERIC_CLOCKEVENTS_MIN_ADJUST
Thomas Gleixnerc01858082011-02-07 02:24:08 +010092 select IRQ_FORCED_THREADING
Amerigo Wang351f8f82011-01-12 16:59:39 -080093 select USE_GENERIC_SMP_HELPERS if SMP
Sam Ravnborge47b65b2012-05-21 20:45:37 +020094 select HAVE_BPF_JIT if X86_64
Gerald Schaefer15626062012-10-08 16:30:04 -070095 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
Thomas Gleixner0a779c52011-06-09 13:08:26 +000096 select CLKEVT_I8253
Huang Yingdf013ff2011-07-13 13:14:22 +080097 select ARCH_HAVE_NMI_SAFE_CMPXCHG
Michael S. Tsirkin4673ca82011-11-24 14:54:28 +020098 select GENERIC_IOMAP
Linus Torvaldse419b4c2012-05-03 10:16:43 -070099 select DCACHE_WORD_ACCESS
Thomas Gleixner7eb43a62012-04-20 13:05:48 +0000100 select GENERIC_SMP_IDLE_THREAD
Will Deaconc1d7e012012-07-30 14:42:46 -0700101 select ARCH_WANT_IPC_PARSE_VERSION if X86_32
Will Drewryc6cfbeb2012-04-12 16:48:03 -0500102 select HAVE_ARCH_SECCOMP_FILTER
David Daney8b5ad472012-04-24 11:23:15 -0700103 select BUILDTIME_EXTABLE_SORT
Thomas Gleixnerbdebaf82012-05-18 16:45:44 +0000104 select GENERIC_CMOS_UPDATE
Pavel Emelyanov0f8975e2013-07-03 15:01:20 -0700105 select HAVE_ARCH_SOFT_DIRTY
Thomas Gleixnerbdebaf82012-05-18 16:45:44 +0000106 select CLOCKSOURCE_WATCHDOG
107 select GENERIC_CLOCKEVENTS
108 select ARCH_CLOCKSOURCE_DATA if X86_64
109 select GENERIC_CLOCKEVENTS_BROADCAST if X86_64 || (X86_32 && X86_LOCAL_APIC)
110 select GENERIC_TIME_VSYSCALL if X86_64
111 select KTIME_SCALAR if X86_32
Linus Torvalds4ae73f22012-05-26 10:14:39 -0700112 select GENERIC_STRNCPY_FROM_USER
Linus Torvalds5723aa92012-05-26 11:09:53 -0700113 select GENERIC_STRNLEN_USER
Frederic Weisbecker91d1aa432012-11-27 19:33:25 +0100114 select HAVE_CONTEXT_TRACKING if X86_64
Frederic Weisbeckerfdf9c352012-09-09 14:56:31 +0200115 select HAVE_IRQ_TIME_ACCOUNTING
Stephen Rothwell4febd952013-03-07 15:48:16 +1100116 select VIRT_TO_BUS
David Howells786d35d2012-09-28 14:31:03 +0930117 select MODULES_USE_ELF_REL if X86_32
118 select MODULES_USE_ELF_RELA if X86_64
Al Viro1d4b4b22012-10-22 22:34:11 -0400119 select CLONE_BACKWARDS if X86_32
David Woodhouse83a57a42012-12-20 01:16:20 +0000120 select ARCH_USE_BUILTIN_BSWAP
Al Viro15ce1f72012-12-25 16:09:20 -0500121 select OLD_SIGSUSPEND3 if X86_32 || IA32_EMULATION
Al Viro5b3eb3a2012-12-25 19:14:55 -0500122 select OLD_SIGACTION if X86_32
123 select COMPAT_OLD_SIGACTION if IA32_EMULATION
Prarit Bhargava3195ef52013-02-14 12:02:54 -0500124 select RTC_LIB
Dave Hansend1a1dc02013-07-01 13:04:42 -0700125 select HAVE_DEBUG_STACKOVERFLOW
Balbir Singh7d8330a2008-02-10 12:46:28 +0530126
Ingo Molnarba7e4d12009-06-06 13:58:12 +0200127config INSTRUCTION_DECODER
Jan Beulich3120e252012-09-10 12:41:45 +0100128 def_bool y
129 depends on KPROBES || PERF_EVENTS || UPROBES
Ingo Molnarba7e4d12009-06-06 13:58:12 +0200130
Linus Torvalds51b26ad2009-04-26 10:12:47 -0700131config OUTPUT_FORMAT
132 string
133 default "elf32-i386" if X86_32
134 default "elf64-x86-64" if X86_64
135
Sam Ravnborg73531902008-05-25 23:03:18 +0200136config ARCH_DEFCONFIG
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +0200137 string
Sam Ravnborg73531902008-05-25 23:03:18 +0200138 default "arch/x86/configs/i386_defconfig" if X86_32
139 default "arch/x86/configs/x86_64_defconfig" if X86_64
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +0200140
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100141config LOCKDEP_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100142 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100143
144config STACKTRACE_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100145 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100146
Heiko Carstensaa7d9352008-02-01 17:45:14 +0100147config HAVE_LATENCYTOP_SUPPORT
148 def_bool y
149
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100150config MMU
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100151 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100152
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100153config SBUS
154 bool
155
FUJITA Tomonori3bc4e452010-03-10 15:23:22 -0800156config NEED_DMA_MAP_STATE
Jan Beulich3120e252012-09-10 12:41:45 +0100157 def_bool y
158 depends on X86_64 || INTEL_IOMMU || DMA_API_DEBUG
FUJITA Tomonori3bc4e452010-03-10 15:23:22 -0800159
FUJITA Tomonori18e98302010-05-26 14:44:32 -0700160config NEED_SG_DMA_LENGTH
Andrew Morton4a14d842010-05-26 14:44:33 -0700161 def_bool y
FUJITA Tomonori18e98302010-05-26 14:44:32 -0700162
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100163config GENERIC_ISA_DMA
Jan Beulich3120e252012-09-10 12:41:45 +0100164 def_bool y
165 depends on ISA_DMA_API
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100166
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100167config GENERIC_BUG
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100168 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100169 depends on BUG
Jan Beulichb93a5312008-12-16 11:40:27 +0000170 select GENERIC_BUG_RELATIVE_POINTERS if X86_64
171
172config GENERIC_BUG_RELATIVE_POINTERS
173 bool
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100174
175config GENERIC_HWEIGHT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100176 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100177
178config ARCH_MAY_HAVE_PC_FDC
Jan Beulich3120e252012-09-10 12:41:45 +0100179 def_bool y
180 depends on ISA_DMA_API
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100181
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100182config RWSEM_XCHGADD_ALGORITHM
Jan Beulich3120e252012-09-10 12:41:45 +0100183 def_bool y
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100184
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100185config GENERIC_CALIBRATE_DELAY
186 def_bool y
187
venkatesh.pallipadi@intel.com9a0b8412008-01-31 17:35:06 -0800188config ARCH_HAS_CPU_RELAX
189 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100190
Pekka Enberg1b27d052008-04-28 02:12:22 -0700191config ARCH_HAS_CACHE_LINE_SIZE
192 def_bool y
193
Thomas Renningerfad12ac2012-01-26 00:09:14 +0100194config ARCH_HAS_CPU_AUTOPROBE
195 def_bool y
196
Mike Travisdd5af902008-01-30 13:33:32 +0100197config HAVE_SETUP_PER_CPU_AREA
Brian Gerst89c9c4c2009-01-27 12:56:48 +0900198 def_bool y
travis@sgi.comb32ef632008-01-30 13:32:51 +0100199
Tejun Heo08fc4582009-08-14 15:00:49 +0900200config NEED_PER_CPU_EMBED_FIRST_CHUNK
201 def_bool y
202
203config NEED_PER_CPU_PAGE_FIRST_CHUNK
Tejun Heo11124412009-02-20 16:29:09 +0900204 def_bool y
205
Johannes Berg801e4062007-12-08 02:12:39 +0100206config ARCH_HIBERNATION_POSSIBLE
207 def_bool y
Johannes Berg801e4062007-12-08 02:12:39 +0100208
Johannes Bergf4cb5702007-12-08 02:14:00 +0100209config ARCH_SUSPEND_POSSIBLE
210 def_bool y
Johannes Bergf4cb5702007-12-08 02:14:00 +0100211
Steve Cappercfe28c52013-04-29 14:29:48 +0100212config ARCH_WANT_HUGE_PMD_SHARE
213 def_bool y
214
Steve Capper53313b22013-04-30 08:03:42 +0100215config ARCH_WANT_GENERAL_HUGETLB
216 def_bool y
217
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100218config ZONE_DMA32
219 bool
220 default X86_64
221
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100222config AUDIT_ARCH
223 bool
224 default X86_64
225
Ingo Molnar765c68b2008-04-09 11:03:37 +0200226config ARCH_SUPPORTS_OPTIMIZED_INLINING
227 def_bool y
228
Akinobu Mita6a11f752009-03-31 15:23:17 -0700229config ARCH_SUPPORTS_DEBUG_PAGEALLOC
230 def_bool y
231
Shane Wang69575d32009-09-01 18:25:07 -0700232config HAVE_INTEL_TXT
233 def_bool y
Kees Cook6ea30382012-10-02 11:16:47 -0700234 depends on INTEL_IOMMU && ACPI
Shane Wang69575d32009-09-01 18:25:07 -0700235
Sam Ravnborg6b0c3d42008-01-30 13:32:27 +0100236config X86_32_SMP
237 def_bool y
238 depends on X86_32 && SMP
239
240config X86_64_SMP
241 def_bool y
242 depends on X86_64 && SMP
243
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100244config X86_HT
Jan Beulich6fc108a2010-04-21 15:23:44 +0100245 def_bool y
Adrian Bunkee0011a2007-12-04 17:19:07 +0100246 depends on SMP
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100247
Tejun Heoccbeed32009-02-09 22:17:40 +0900248config X86_32_LAZY_GS
249 def_bool y
Tejun Heo60a53172009-02-09 22:17:40 +0900250 depends on X86_32 && !CC_STACKPROTECTOR
Tejun Heoccbeed32009-02-09 22:17:40 +0900251
Borislav Petkovd61931d2010-03-05 17:34:46 +0100252config ARCH_HWEIGHT_CFLAGS
253 string
254 default "-fcall-saved-ecx -fcall-saved-edx" if X86_32
255 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
256
Borislav Petkovd7c53c92010-08-19 20:10:29 +0200257config ARCH_CPU_PROBE_RELEASE
258 def_bool y
259 depends on HOTPLUG_CPU
260
Srikar Dronamraju2b144492012-02-09 14:56:42 +0530261config ARCH_SUPPORTS_UPROBES
262 def_bool y
263
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100264source "init/Kconfig"
Matt Helsleydc52ddc2008-10-18 20:27:21 -0700265source "kernel/Kconfig.freezer"
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100266
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100267menu "Processor type and features"
268
Randy Dunlap5ee71532012-01-16 11:57:18 -0800269config ZONE_DMA
270 bool "DMA memory allocation support" if EXPERT
271 default y
272 help
273 DMA memory allocation support allows devices with less than 32-bit
274 addressing to allocate within the first 16MB of address space.
275 Disable if no such devices will be used.
276
277 If unsure, say Y.
278
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100279config SMP
280 bool "Symmetric multi-processing support"
281 ---help---
282 This enables support for systems with more than one CPU. If you have
283 a system with only one CPU, like most personal computers, say N. If
284 you have a system with more than one CPU, say Y.
285
286 If you say N here, the kernel will run on single and multiprocessor
287 machines, but will use only one CPU of a multiprocessor machine. If
288 you say Y here, the kernel will run on many, but not all,
289 singleprocessor machines. On a singleprocessor machine, the kernel
290 will run faster if you say N here.
291
292 Note that if you say Y here and choose architecture "586" or
293 "Pentium" under "Processor family", the kernel will not work on 486
294 architectures. Similarly, multiprocessor kernels for the "PPro"
295 architecture may not work on all Pentium based boards.
296
297 People using multiprocessor machines who say Y here should also say
298 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
299 Management" code will be disabled if you say Y here.
300
Paul Bolle395cf962011-08-15 02:02:26 +0200301 See also <file:Documentation/x86/i386/IO-APIC.txt>,
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100302 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
303 <http://www.tldp.org/docs.html#howto>.
304
305 If you don't know what to do here, say N.
306
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800307config X86_X2APIC
308 bool "Support x2apic"
Suresh Siddhad3f13812011-08-23 17:05:25 -0700309 depends on X86_LOCAL_APIC && X86_64 && IRQ_REMAP
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800310 ---help---
311 This enables x2apic support on CPUs that have this feature.
312
313 This allows 32-bit apic IDs (so it can support very large systems),
314 and accesses the local apic via MSRs not via mmio.
315
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800316 If you don't know what to do here, say N.
317
Yinghai Lu6695c852008-06-19 12:13:09 -0700318config X86_MPPARSE
Bin Gao6e87f9b72012-10-25 09:35:44 -0700319 bool "Enable MPS table" if ACPI || SFI
Jan Beulich7a527682008-10-30 10:38:24 +0000320 default y
Ingo Molnar5ab74722008-07-10 14:42:03 +0200321 depends on X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100322 ---help---
Yinghai Lu6695c852008-06-19 12:13:09 -0700323 For old smp systems that do not have proper acpi support. Newer systems
324 (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
Yinghai Lu6695c852008-06-19 12:13:09 -0700325
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800326config X86_BIGSMP
327 bool "Support for big SMP systems with more than 8 CPUs"
328 depends on X86_32 && SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100329 ---help---
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800330 This option is needed for the systems that have more than 8 CPUs
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100331
Jun Nakajimaddd70cf2013-01-21 17:23:09 +0000332config GOLDFISH
333 def_bool y
334 depends on X86_GOLDFISH
335
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800336if X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800337config X86_EXTENDED_PLATFORM
338 bool "Support for extended (non-PC) x86 platforms"
339 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100340 ---help---
Ingo Molnar06ac8342009-01-27 18:11:43 +0100341 If you disable this option then the kernel will only support
342 standard PC platforms. (which covers the vast majority of
343 systems out there.)
344
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800345 If you enable this option then you'll be able to select support
346 for the following (non-PC) 32 bit x86 platforms:
Ben Hutchingscb7b8022013-06-24 01:05:25 +0100347 Goldfish (Android emulator)
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800348 AMD Elan
349 NUMAQ (IBM/Sequent)
350 RDC R-321x SoC
351 SGI 320/540 (Visual Workstation)
Alessandro Rubini83125a32012-04-04 19:40:21 +0200352 STA2X11-based (e.g. Northville)
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800353 Summit/EXA (IBM x440)
354 Unisys ES7000 IA32 series
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200355 Moorestown MID devices
Ingo Molnar06ac8342009-01-27 18:11:43 +0100356
357 If you have one of these systems, or if you want to build a
358 generic distribution kernel, say Y here - otherwise say N.
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800359endif
Ingo Molnar06ac8342009-01-27 18:11:43 +0100360
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800361if X86_64
362config X86_EXTENDED_PLATFORM
363 bool "Support for extended (non-PC) x86 platforms"
364 default y
365 ---help---
366 If you disable this option then the kernel will only support
367 standard PC platforms. (which covers the vast majority of
368 systems out there.)
369
370 If you enable this option then you'll be able to select support
371 for the following (non-PC) 64 bit x86 platforms:
Steffen Persvold44b111b52011-12-06 00:07:26 +0800372 Numascale NumaChip
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800373 ScaleMP vSMP
374 SGI Ultraviolet
375
376 If you have one of these systems, or if you want to build a
377 generic distribution kernel, say Y here - otherwise say N.
378endif
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800379# This is an alphabetically sorted list of 64 bit extended platforms
380# Please maintain the alphabetic order if and when there are additions
Steffen Persvold44b111b52011-12-06 00:07:26 +0800381config X86_NUMACHIP
382 bool "Numascale NumaChip"
383 depends on X86_64
384 depends on X86_EXTENDED_PLATFORM
385 depends on NUMA
386 depends on SMP
387 depends on X86_X2APIC
Daniel J Bluemanf9726bf2012-12-07 14:24:32 -0700388 depends on PCI_MMCONFIG
Steffen Persvold44b111b52011-12-06 00:07:26 +0800389 ---help---
390 Adds support for Numascale NumaChip large-SMP systems. Needed to
391 enable more than ~168 cores.
392 If you don't have one of these, you should say N here.
Nick Piggin03b48632009-01-20 04:36:04 +0100393
Ingo Molnar6a485652009-01-27 18:29:13 +0100394config X86_VSMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800395 bool "ScaleMP vSMP"
Borislav Petkov6276a072013-03-04 21:20:21 +0100396 select HYPERVISOR_GUEST
Ingo Molnar6a485652009-01-27 18:29:13 +0100397 select PARAVIRT
398 depends on X86_64 && PCI
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800399 depends on X86_EXTENDED_PLATFORM
Shai Fultheimead91d42012-04-16 10:39:35 +0300400 depends on SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100401 ---help---
Ingo Molnar6a485652009-01-27 18:29:13 +0100402 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
403 supposed to run on these EM64T-based machines. Only choose this option
404 if you have one of these machines.
405
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800406config X86_UV
407 bool "SGI Ultraviolet"
408 depends on X86_64
409 depends on X86_EXTENDED_PLATFORM
Jack Steiner54c28d22009-04-03 15:39:42 -0500410 depends on NUMA
Suresh Siddha9d6c26e2009-04-20 13:02:31 -0700411 depends on X86_X2APIC
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800412 ---help---
413 This option is needed in order to support SGI Ultraviolet systems.
414 If you don't have one of these, you should say N here.
415
416# Following is an alphabetically sorted list of 32 bit extended platforms
417# Please maintain the alphabetic order if and when there are additions
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100418
Jun Nakajimaddd70cf2013-01-21 17:23:09 +0000419config X86_GOLDFISH
420 bool "Goldfish (Virtual Platform)"
421 depends on X86_32
Ben Hutchingscb7b8022013-06-24 01:05:25 +0100422 depends on X86_EXTENDED_PLATFORM
Jun Nakajimaddd70cf2013-01-21 17:23:09 +0000423 ---help---
424 Enable support for the Goldfish virtual platform used primarily
425 for Android development. Unless you are building for the Android
426 Goldfish emulator say N here.
427
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800428config X86_INTEL_CE
429 bool "CE4100 TV platform"
430 depends on PCI
431 depends on PCI_GODIRECT
432 depends on X86_32
433 depends on X86_EXTENDED_PLATFORM
Dirk Brandewie37bc9f52010-11-09 12:08:08 -0800434 select X86_REBOOTFIXUPS
Sebastian Andrzej Siewiorda6b7372011-02-22 21:07:37 +0100435 select OF
436 select OF_EARLY_FLATTREE
Grant Likelyb4e51852011-12-16 15:50:17 -0700437 select IRQ_DOMAIN
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800438 ---help---
439 Select for the Intel CE media processor (CE4100) SOC.
440 This option compiles in support for the CE4100 SOC for settop
441 boxes and media devices.
442
Alan Coxdd137522011-12-05 23:14:39 +0000443config X86_WANT_INTEL_MID
Alan Cox43605ef2011-07-12 17:49:29 +0100444 bool "Intel MID platform support"
445 depends on X86_32
446 depends on X86_EXTENDED_PLATFORM
447 ---help---
448 Select to build a kernel capable of supporting Intel MID platform
449 systems which do not have the PCI legacy interfaces (Moorestown,
450 Medfield). If you are building for a PC class system say N here.
451
Alan Coxdd137522011-12-05 23:14:39 +0000452if X86_WANT_INTEL_MID
Alan Cox43605ef2011-07-12 17:49:29 +0100453
Alan Cox4e2b1c42011-12-06 13:28:22 +0000454config X86_INTEL_MID
455 bool
456
Alan Cox1ea7c672011-11-10 13:29:14 +0000457config X86_MDFLD
458 bool "Medfield MID platform"
459 depends on PCI
460 depends on PCI_GOANY
461 depends on X86_IO_APIC
Alan Cox7c9c3a12011-12-29 14:43:16 +0000462 select X86_INTEL_MID
463 select SFI
464 select DW_APB_TIMER
Alan Cox1ea7c672011-11-10 13:29:14 +0000465 select APB_TIMER
466 select I2C
467 select SPI
468 select INTEL_SCU_IPC
469 select X86_PLATFORM_DEVICES
Mika Westerberg15a713d2012-01-26 17:35:05 +0000470 select MFD_INTEL_MSIC
Alan Cox1ea7c672011-11-10 13:29:14 +0000471 ---help---
472 Medfield is Intel's Low Power Intel Architecture (LPIA) based Moblin
473 Internet Device(MID) platform.
474 Unlike standard x86 PCs, Medfield does not have many legacy devices
475 nor standard legacy replacement devices/features. e.g. Medfield does
476 not contain i8259, i8254, HPET, legacy BIOS, most of the io ports.
477
Alan Cox43605ef2011-07-12 17:49:29 +0100478endif
479
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000480config X86_INTEL_LPSS
481 bool "Intel Low Power Subsystem Support"
482 depends on ACPI
483 select COMMON_CLK
Mathias Nyman0f531432013-09-13 17:02:29 +0300484 select PINCTRL
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000485 ---help---
486 Select to build support for Intel Low Power Subsystem such as
487 found on Intel Lynxpoint PCH. Selecting this option enables
Mathias Nyman0f531432013-09-13 17:02:29 +0300488 things like clock tree (common clock framework) and pincontrol
489 which are needed by the LPSS peripheral drivers.
Mika Westerberg3d48aab2013-01-18 13:45:59 +0000490
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800491config X86_RDC321X
492 bool "RDC R-321x SoC"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100493 depends on X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800494 depends on X86_EXTENDED_PLATFORM
495 select M486
496 select X86_REBOOTFIXUPS
497 ---help---
498 This option is needed for RDC R-321x system-on-chip, also known
499 as R-8610-(G).
500 If you don't have one of these chips, you should say N here.
501
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100502config X86_32_NON_STANDARD
Ingo Molnar9c398012009-01-27 18:24:57 +0100503 bool "Support non-standard 32-bit SMP architectures"
504 depends on X86_32 && SMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800505 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100506 ---help---
Alessandro Rubini83125a32012-04-04 19:40:21 +0200507 This option compiles in the NUMAQ, Summit, bigsmp, ES7000,
508 STA2X11, default subarchitectures. It is intended for a generic
509 binary kernel. If you select them all, kernel will probe it
510 one by one and will fallback to default.
Yinghai Lud49c4282008-06-08 18:31:54 -0700511
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800512# Alphabetically sorted list of Non standard 32 bit platforms
Yinghai Lud49c4282008-06-08 18:31:54 -0700513
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100514config X86_NUMAQ
515 bool "NUMAQ (IBM/Sequent)"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100516 depends on X86_32_NON_STANDARD
Pan, Jacob juna92d1522010-02-24 16:59:55 -0800517 depends on PCI
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100518 select NUMA
Ingo Molnar9c398012009-01-27 18:24:57 +0100519 select X86_MPPARSE
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100520 ---help---
Yinghai Lud49c4282008-06-08 18:31:54 -0700521 This option is used for getting Linux to run on a NUMAQ (IBM/Sequent)
522 NUMA multiquad box. This changes the way that processors are
523 bootstrapped, and uses Clustered Logical APIC addressing mode instead
524 of Flat Logical. You will need a new lynxer.elf file to flash your
525 firmware with - send email to <Martin.Bligh@us.ibm.com>.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100526
Linus Torvaldsd949f362009-09-26 09:35:07 -0700527config X86_SUPPORTS_MEMORY_FAILURE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100528 def_bool y
Linus Torvaldsd949f362009-09-26 09:35:07 -0700529 # MCE code calls memory_failure():
530 depends on X86_MCE
531 # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
532 depends on !X86_NUMAQ
533 # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
534 depends on X86_64 || !SPARSEMEM
535 select ARCH_SUPPORTS_MEMORY_FAILURE
Linus Torvaldsd949f362009-09-26 09:35:07 -0700536
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200537config X86_VISWS
538 bool "SGI 320/540 (Visual Workstation)"
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800539 depends on X86_32 && PCI && X86_MPPARSE && PCI_GODIRECT
540 depends on X86_32_NON_STANDARD
541 ---help---
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200542 The SGI Visual Workstation series is an IA32-based workstation
543 based on SGI systems chips with some legacy PC hardware attached.
544
545 Say Y here to create a kernel to run on the SGI 320 or 540.
546
547 A kernel compiled for the Visual Workstation will run on general
548 PCs as well. See <file:Documentation/sgi-visws.txt> for details.
549
Alessandro Rubini83125a32012-04-04 19:40:21 +0200550config STA2X11
551 bool "STA2X11 Companion Chip Support"
552 depends on X86_32_NON_STANDARD && PCI
553 select X86_DEV_DMA_OPS
554 select X86_DMA_REMAP
555 select SWIOTLB
556 select MFD_STA2X11
557 select ARCH_REQUIRE_GPIOLIB
558 default n
559 ---help---
560 This adds support for boards based on the STA2X11 IO-Hub,
561 a.k.a. "ConneXt". The chip is used in place of the standard
562 PC chipset, so all "standard" peripherals are missing. If this
563 option is selected the kernel will still be able to boot on
564 standard PC machines.
565
Ingo Molnar9c398012009-01-27 18:24:57 +0100566config X86_SUMMIT
567 bool "Summit/EXA (IBM x440)"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100568 depends on X86_32_NON_STANDARD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100569 ---help---
Ingo Molnar9c398012009-01-27 18:24:57 +0100570 This option is needed for IBM systems that use the Summit/EXA chipset.
571 In particular, it is needed for the x440.
Ingo Molnar1f972762008-07-26 13:52:50 +0200572
Ingo Molnar9c398012009-01-27 18:24:57 +0100573config X86_ES7000
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800574 bool "Unisys ES7000 IA32 series"
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800575 depends on X86_32_NON_STANDARD && X86_BIGSMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100576 ---help---
Ingo Molnar9c398012009-01-27 18:24:57 +0100577 Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
578 supposed to run on an IA32-based Unisys ES7000 system.
579
Shérab82148d12010-09-25 06:06:57 +0200580config X86_32_IRIS
581 tristate "Eurobraille/Iris poweroff module"
582 depends on X86_32
583 ---help---
584 The Iris machines from EuroBraille do not have APM or ACPI support
585 to shut themselves down properly. A special I/O sequence is
586 needed to do so, which is what this module does at
587 kernel shutdown.
588
589 This is only for Iris machines from EuroBraille.
590
591 If unused, say N.
592
Ingo Molnarae1e9132008-11-11 09:05:16 +0100593config SCHED_OMIT_FRAME_POINTER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100594 def_bool y
595 prompt "Single-depth WCHAN output"
Ken Chena87d0912008-11-06 11:10:49 -0800596 depends on X86
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100597 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100598 Calculate simpler /proc/<PID>/wchan values. If this option
599 is disabled then wchan values will recurse back to the
600 caller function. This provides more accurate wchan values,
601 at the expense of slightly more scheduling overhead.
602
603 If in doubt, say "Y".
604
Borislav Petkov6276a072013-03-04 21:20:21 +0100605menuconfig HYPERVISOR_GUEST
606 bool "Linux guest support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100607 ---help---
Borislav Petkov6276a072013-03-04 21:20:21 +0100608 Say Y here to enable options for running Linux under various hyper-
609 visors. This option enables basic hypervisor detection and platform
610 setup.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100611
Borislav Petkov6276a072013-03-04 21:20:21 +0100612 If you say N, all options in this submenu will be skipped and
613 disabled, and Linux guest support won't be built in.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100614
Borislav Petkov6276a072013-03-04 21:20:21 +0100615if HYPERVISOR_GUEST
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100616
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100617config PARAVIRT
618 bool "Enable paravirtualization code"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100619 ---help---
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100620 This changes the kernel so it can modify itself when it is run
621 under a hypervisor, potentially improving performance significantly
622 over full virtualization. However, when run without a hypervisor
623 the kernel is theoretically slower and slightly larger.
624
Borislav Petkov6276a072013-03-04 21:20:21 +0100625config PARAVIRT_DEBUG
626 bool "paravirt-ops debugging"
627 depends on PARAVIRT && DEBUG_KERNEL
628 ---help---
629 Enable to debug paravirt_ops internals. Specifically, BUG if
630 a paravirt_op is missing when it is called.
631
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700632config PARAVIRT_SPINLOCKS
633 bool "Paravirtualization layer for spinlocks"
Kees Cook6ea30382012-10-02 11:16:47 -0700634 depends on PARAVIRT && SMP
Raghavendra K T8db73262013-08-09 19:51:50 +0530635 select UNINLINE_SPIN_UNLOCK
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700636 ---help---
637 Paravirtualized spinlocks allow a pvops backend to replace the
638 spinlock implementation with something virtualization-friendly
639 (for example, block the virtual CPU rather than spinning).
640
Raghavendra K T4c4e4f62013-10-21 21:35:08 +0530641 It has a minimal impact on native kernels and gives a nice performance
642 benefit on paravirtualized KVM / Xen kernels.
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700643
Raghavendra K T4c4e4f62013-10-21 21:35:08 +0530644 If you are unsure how to answer this question, answer Y.
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700645
Borislav Petkov6276a072013-03-04 21:20:21 +0100646source "arch/x86/xen/Kconfig"
647
648config KVM_GUEST
649 bool "KVM Guest support (including kvmclock)"
650 depends on PARAVIRT
651 select PARAVIRT_CLOCK
652 default y
653 ---help---
654 This option enables various optimizations for running under the KVM
655 hypervisor. It includes a paravirtualized clock, so that instead
656 of relying on a PIT (or probably other) emulation by the
657 underlying device model, the host provides the guest with
658 timing infrastructure such as time of day, and system time
659
Srivatsa Vaddagiri1e20eb82013-08-09 19:52:01 +0530660config KVM_DEBUG_FS
661 bool "Enable debug information for KVM Guests in debugfs"
662 depends on KVM_GUEST && DEBUG_FS
663 default n
664 ---help---
665 This option enables collection of various statistics for KVM guest.
666 Statistics are displayed in debugfs filesystem. Enabling this option
667 may incur significant overhead.
668
Borislav Petkov6276a072013-03-04 21:20:21 +0100669source "arch/x86/lguest/Kconfig"
670
671config PARAVIRT_TIME_ACCOUNTING
672 bool "Paravirtual steal time accounting"
673 depends on PARAVIRT
674 default n
675 ---help---
676 Select this option to enable fine granularity task steal time
677 accounting. Time spent executing other tasks in parallel with
678 the current vCPU is discounted from the vCPU power. To account for
679 that, there can be a small performance impact.
680
681 If in doubt, say N here.
682
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200683config PARAVIRT_CLOCK
684 bool
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200685
Borislav Petkov6276a072013-03-04 21:20:21 +0100686endif #HYPERVISOR_GUEST
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400687
Yinghai Lu08677212010-02-10 01:20:20 -0800688config NO_BOOTMEM
Yinghai Lu774ea0b2010-08-25 13:39:18 -0700689 def_bool y
Yinghai Lu08677212010-02-10 01:20:20 -0800690
Yinghai Lu03273182008-04-18 17:49:15 -0700691config MEMTEST
692 bool "Memtest"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100693 ---help---
Yinghai Luc64df702008-03-21 18:56:19 -0700694 This option adds a kernel parameter 'memtest', which allows memtest
Yinghai Lu03273182008-04-18 17:49:15 -0700695 to be set.
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100696 memtest=0, mean disabled; -- default
697 memtest=1, mean do 1 test pattern;
698 ...
699 memtest=4, mean do 4 test patterns.
Thomas Gleixneraba37282008-07-15 14:48:48 +0200700 If you are unsure how to answer this question, answer N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100701
702config X86_SUMMIT_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100703 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100704 depends on X86_32 && NUMA && X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100705
706config X86_CYCLONE_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100707 def_bool y
Alessandro Rubinif9b15df2011-10-29 00:48:42 +0200708 depends on X86_SUMMIT
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
David Rientjes6a108a12011-01-20 14:44:16 -0800751 bool "Enable DMI scanning" if EXPERT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100752 ---help---
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700753 Enabled scanning of DMI to identify machine quirks. Say Y
754 here unless you have verified that your setup is not
755 affected by entries in the DMI blacklist. Required by PNP
756 BIOS code.
757
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100758config GART_IOMMU
David Rientjes6a108a12011-01-20 14:44:16 -0800759 bool "GART IOMMU support" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100760 default y
761 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---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100764 Support for full DMA access of devices with 32bit memory access only
765 on systems with more than 3GB. This is usually needed for USB,
766 sound, many IDE/SATA chipsets and some other devices.
767 Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
768 based hardware IOMMU and a software bounce buffer based IOMMU used
769 on Intel systems and as fallback.
770 The code is only active when needed (enough memory and limited
771 device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
772 too.
773
774config CALGARY_IOMMU
775 bool "IBM Calgary IOMMU support"
776 select SWIOTLB
Kees Cook6ea30382012-10-02 11:16:47 -0700777 depends on X86_64 && PCI
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100778 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100779 Support for hardware IOMMUs in IBM's xSeries x366 and x460
780 systems. Needed to run systems with more than 3GB of memory
781 properly with 32-bit PCI devices that do not support DAC
782 (Double Address Cycle). Calgary also supports bus level
783 isolation, where all DMAs pass through the IOMMU. This
784 prevents them from going anywhere except their intended
785 destination. This catches hard-to-find kernel bugs and
786 mis-behaving drivers and devices that do not use the DMA-API
787 properly to set up their DMA buffers. The IOMMU can be
788 turned off at boot time with the iommu=off parameter.
789 Normally the kernel will make the right choice by itself.
790 If unsure, say Y.
791
792config CALGARY_IOMMU_ENABLED_BY_DEFAULT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100793 def_bool y
794 prompt "Should Calgary be enabled by default?"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100795 depends on CALGARY_IOMMU
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100796 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100797 Should Calgary be enabled by default? if you choose 'y', Calgary
798 will be used (if it exists). If you choose 'n', Calgary will not be
799 used even if it exists. If you choose 'n' and would like to use
800 Calgary anyway, pass 'iommu=calgary' on the kernel command line.
801 If unsure, say Y.
802
803# need this always selected by IOMMU for the VIA workaround
804config SWIOTLB
Joerg Roedela1afd012008-11-18 12:44:21 +0100805 def_bool y if X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100806 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100807 Support for software bounce buffers used on x86-64 systems
Joe Millenbach4454d322012-09-02 17:38:20 -0700808 which don't have a hardware IOMMU. Using this PCI devices
809 which can only access 32-bits of memory can be used on systems
810 with more than 3 GB of memory.
811 If unsure, say Y.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100812
FUJITA Tomonoria8522502008-04-29 00:59:36 -0700813config IOMMU_HELPER
Jan Beulich3120e252012-09-10 12:41:45 +0100814 def_bool y
815 depends on CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700816
Mike Travis1184dc22008-05-12 21:21:12 +0200817config MAXSMP
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200818 bool "Enable Maximum number of SMP Processors and NUMA Nodes"
Kees Cook6ea30382012-10-02 11:16:47 -0700819 depends on X86_64 && SMP && DEBUG_KERNEL
Mike Travis36f51012008-12-16 17:33:51 -0800820 select CPUMASK_OFFSTACK
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100821 ---help---
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200822 Enable maximum number of CPUS and NUMA Nodes for this architecture.
Mike Travis1184dc22008-05-12 21:21:12 +0200823 If unsure, say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100824
825config NR_CPUS
Mike Travis36f51012008-12-16 17:33:51 -0800826 int "Maximum number of CPUs" if SMP && !MAXSMP
Michael K. Johnson2a3313f2009-04-21 21:44:48 -0400827 range 2 8 if SMP && X86_32 && !X86_BIGSMP
Mike Travis36f51012008-12-16 17:33:51 -0800828 range 2 512 if SMP && !MAXSMP
Mike Travis78637a972008-12-16 17:34:00 -0800829 default "1" if !SMP
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700830 default "4096" if MAXSMP
Mike Travis78637a972008-12-16 17:34:00 -0800831 default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000)
832 default "8" if SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100833 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100834 This allows you to specify the maximum number of CPUs which this
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700835 kernel will support. The maximum supported value is 512 and the
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100836 minimum value which makes sense is 2.
837
838 This is purely to save memory - each supported CPU adds
839 approximately eight kilobytes to the kernel image.
840
841config SCHED_SMT
842 bool "SMT (Hyperthreading) scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800843 depends on X86_HT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100844 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100845 SMT scheduler support improves the CPU scheduler's decision making
846 when dealing with Intel Pentium 4 chips with HyperThreading at a
847 cost of slightly increased overhead in some places. If unsure say
848 N here.
849
850config SCHED_MC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100851 def_bool y
852 prompt "Multi-core scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800853 depends on X86_HT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100854 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100855 Multi-core scheduler support improves the CPU scheduler's decision
856 making when dealing with multi-core CPU chips at a cost of slightly
857 increased overhead in some places. If unsure say N here.
858
859source "kernel/Kconfig.preempt"
860
861config X86_UP_APIC
862 bool "Local APIC support on uniprocessors"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100863 depends on X86_32 && !SMP && !X86_32_NON_STANDARD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100864 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100865 A local APIC (Advanced Programmable Interrupt Controller) is an
866 integrated interrupt controller in the CPU. If you have a single-CPU
867 system which has a processor with a local APIC, you can say Y here to
868 enable and use it. If you say Y here even though your machine doesn't
869 have a local APIC, then the kernel will still run with no slowdown at
870 all. The local APIC supports CPU-generated self-interrupts (timer,
871 performance counters), and the NMI watchdog which detects hard
872 lockups.
873
874config X86_UP_IOAPIC
875 bool "IO-APIC support on uniprocessors"
876 depends on X86_UP_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100877 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100878 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
879 SMP-capable replacement for PC-style interrupt controllers. Most
880 SMP systems and many recent uniprocessor systems have one.
881
882 If you have a single-CPU system with an IO-APIC, you can say Y here
883 to use it. If you say Y here even though your machine doesn't have
884 an IO-APIC, then the kernel will still run with no slowdown at all.
885
886config X86_LOCAL_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100887 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100888 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100889
890config X86_IO_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100891 def_bool y
Henrik Kretzschmar1444e0c2011-02-22 15:38:07 +0100892 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_IOAPIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100893
894config X86_VISWS_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100895 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100896 depends on X86_32 && X86_VISWS
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100897
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200898config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
899 bool "Reroute for broken boot IRQs"
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200900 depends on X86_IO_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100901 ---help---
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200902 This option enables a workaround that fixes a source of
903 spurious interrupts. This is recommended when threaded
904 interrupt handling is used on systems where the generation of
905 superfluous "boot interrupts" cannot be disabled.
906
907 Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
908 entry in the chipset's IO-APIC is masked (as, e.g. the RT
909 kernel does during interrupt handling). On chipsets where this
910 boot IRQ generation cannot be disabled, this workaround keeps
911 the original IRQ line masked so that only the equivalent "boot
912 IRQ" is delivered to the CPUs. The workaround also tells the
913 kernel to set up the IRQ handler on the boot IRQ line. In this
914 way only one interrupt is delivered to the kernel. Otherwise
915 the spurious second interrupt may cause the kernel to bring
916 down (vital) interrupt lines.
917
918 Only affects "broken" chipsets. Interrupt sharing may be
919 increased on these systems.
920
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100921config X86_MCE
Andi Kleenbab9bc62009-07-09 00:31:38 +0200922 bool "Machine Check / overheating reporting"
Borislav Petkove57dbaf2011-09-13 15:23:21 +0200923 default y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100924 ---help---
Andi Kleenbab9bc62009-07-09 00:31:38 +0200925 Machine Check support allows the processor to notify the
926 kernel if it detects a problem (e.g. overheating, data corruption).
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100927 The action the kernel takes depends on the severity of the problem,
Andi Kleenbab9bc62009-07-09 00:31:38 +0200928 ranging from warning messages to halting the machine.
Andi Kleen4efc0672009-04-28 19:07:31 +0200929
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100930config X86_MCE_INTEL
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100931 def_bool y
932 prompt "Intel MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +0200933 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100934 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100935 Additional support for intel specific MCE features such as
936 the thermal monitor.
937
938config X86_MCE_AMD
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100939 def_bool y
940 prompt "AMD MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +0200941 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100942 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100943 Additional support for AMD specific MCE features such as
944 the DRAM Error Threshold.
945
Andi Kleen4efc0672009-04-28 19:07:31 +0200946config X86_ANCIENT_MCE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100947 bool "Support for old Pentium 5 / WinChip machine checks"
Andi Kleenc31d9632009-07-09 00:31:37 +0200948 depends on X86_32 && X86_MCE
Hidetoshi Setocd13adcc2009-05-27 16:57:31 +0900949 ---help---
950 Include support for machine check handling on old Pentium 5 or WinChip
951 systems. These typically need to be enabled explicitely on the command
952 line.
Andi Kleen4efc0672009-04-28 19:07:31 +0200953
Andi Kleenb2762682009-02-12 13:49:31 +0100954config X86_MCE_THRESHOLD
955 depends on X86_MCE_AMD || X86_MCE_INTEL
Jan Beulich6fc108a2010-04-21 15:23:44 +0100956 def_bool y
Andi Kleenb2762682009-02-12 13:49:31 +0100957
Andi Kleenea149b32009-04-29 19:31:00 +0200958config X86_MCE_INJECT
Andi Kleenc1ebf832009-07-09 00:31:41 +0200959 depends on X86_MCE
Andi Kleenea149b32009-04-29 19:31:00 +0200960 tristate "Machine check injector support"
961 ---help---
962 Provide support for injecting machine checks for testing purposes.
963 If you don't know what a machine check is and you don't do kernel
964 QA it is safe to say n.
965
Andi Kleen4efc0672009-04-28 19:07:31 +0200966config X86_THERMAL_VECTOR
967 def_bool y
Andi Kleen5bb38ad2009-07-09 00:31:39 +0200968 depends on X86_MCE_INTEL
Andi Kleen4efc0672009-04-28 19:07:31 +0200969
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100970config VM86
David Rientjes6a108a12011-01-20 14:44:16 -0800971 bool "Enable VM86 support" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100972 default y
973 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100974 ---help---
975 This option is required by programs like DOSEMU to run 16-bit legacy
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100976 code on X86 processors. It also may be needed by software like
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100977 XFree86 to initialize some video cards via BIOS. Disabling this
978 option saves about 6k.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100979
980config TOSHIBA
981 tristate "Toshiba Laptop support"
982 depends on X86_32
983 ---help---
984 This adds a driver to safely access the System Management Mode of
985 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
986 not work on models with a Phoenix BIOS. The System Management Mode
987 is used to set the BIOS and power saving options on Toshiba portables.
988
989 For information on utilities to make use of this driver see the
990 Toshiba Linux utilities web site at:
991 <http://www.buzzard.org.uk/toshiba/>.
992
993 Say Y if you intend to run this kernel on a Toshiba portable.
994 Say N otherwise.
995
996config I8K
997 tristate "Dell laptop support"
Jean Delvare949a9d72011-05-25 20:43:33 +0200998 select HWMON
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100999 ---help---
1000 This adds a driver to safely access the System Management Mode
1001 of the CPU on the Dell Inspiron 8000. The System Management Mode
1002 is used to read cpu temperature and cooling fan status and to
1003 control the fans on the I8K portables.
1004
1005 This driver has been tested only on the Inspiron 8000 but it may
1006 also work with other Dell laptops. You can force loading on other
1007 models by passing the parameter `force=1' to the module. Use at
1008 your own risk.
1009
1010 For information on utilities to make use of this driver see the
1011 I8K Linux utilities web site at:
1012 <http://people.debian.org/~dz/i8k/>
1013
1014 Say Y if you intend to run this kernel on a Dell Inspiron 8000.
1015 Say N otherwise.
1016
1017config X86_REBOOTFIXUPS
Jan Beulich9ba16082008-10-15 22:01:38 -07001018 bool "Enable X86 board specific fixups for reboot"
1019 depends on X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001020 ---help---
1021 This enables chipset and/or board specific fixups to be done
1022 in order to get reboot to work correctly. This is only needed on
1023 some combinations of hardware and BIOS. The symptom, for which
1024 this config is intended, is when reboot ends with a stalled/hung
1025 system.
1026
1027 Currently, the only fixup is for the Geode machines using
Florian Fainelli5e3a77e2008-01-30 13:33:36 +01001028 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001029
1030 Say Y if you want to enable the fixup. Currently, it's safe to
1031 enable this option even if you don't need it.
1032 Say N otherwise.
1033
1034config MICROCODE
Borislav Petkove43f6e62012-08-01 19:17:01 +02001035 tristate "CPU microcode loading support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001036 select FW_LOADER
1037 ---help---
Borislav Petkove43f6e62012-08-01 19:17:01 +02001038
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001039 If you say Y here, you will be able to update the microcode on
Peter Oruba80cc9f12008-07-28 18:44:22 +02001040 certain Intel and AMD processors. The Intel support is for the
Borislav Petkove43f6e62012-08-01 19:17:01 +02001041 IA32 family, e.g. Pentium Pro, Pentium II, Pentium III, Pentium 4,
1042 Xeon etc. The AMD support is for families 0x10 and later. You will
1043 obviously need the actual microcode binary data itself which is not
1044 shipped with the Linux kernel.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001045
Peter Oruba8d86f392008-07-28 18:44:21 +02001046 This option selects the general module only, you need to select
1047 at least one vendor specific module as well.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001048
Borislav Petkove43f6e62012-08-01 19:17:01 +02001049 To compile this driver as a module, choose M here: the module
1050 will be called microcode.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001051
Peter Oruba8d86f392008-07-28 18:44:21 +02001052config MICROCODE_INTEL
Borislav Petkove43f6e62012-08-01 19:17:01 +02001053 bool "Intel microcode loading support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001054 depends on MICROCODE
1055 default MICROCODE
1056 select FW_LOADER
1057 ---help---
1058 This options enables microcode patch loading support for Intel
1059 processors.
Peter Oruba8d86f392008-07-28 18:44:21 +02001060
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001061 For latest news and information on obtaining all the required
1062 Intel ingredients for this driver, check:
1063 <http://www.urbanmyth.org/microcode/>.
Peter Oruba8d86f392008-07-28 18:44:21 +02001064
Peter Oruba80cc9f12008-07-28 18:44:22 +02001065config MICROCODE_AMD
Borislav Petkove43f6e62012-08-01 19:17:01 +02001066 bool "AMD microcode loading support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001067 depends on MICROCODE
1068 select FW_LOADER
1069 ---help---
1070 If you select this option, microcode patch loading support for AMD
1071 processors will be enabled.
Peter Oruba80cc9f12008-07-28 18:44:22 +02001072
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001073config MICROCODE_OLD_INTERFACE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001074 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001075 depends on MICROCODE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001076
Fenghua Yuda76f642012-12-20 23:44:32 -08001077config MICROCODE_INTEL_LIB
1078 def_bool y
1079 depends on MICROCODE_INTEL
1080
1081config MICROCODE_INTEL_EARLY
Jacob Shin757885e2013-05-30 14:09:19 -05001082 def_bool n
1083
1084config MICROCODE_AMD_EARLY
1085 def_bool n
1086
1087config MICROCODE_EARLY
Fenghua Yuda76f642012-12-20 23:44:32 -08001088 bool "Early load microcode"
Jacob Shin6b3389a2013-05-31 01:53:24 -05001089 depends on MICROCODE=y && BLK_DEV_INITRD
Jacob Shin757885e2013-05-30 14:09:19 -05001090 select MICROCODE_INTEL_EARLY if MICROCODE_INTEL
1091 select MICROCODE_AMD_EARLY if MICROCODE_AMD
Fenghua Yuda76f642012-12-20 23:44:32 -08001092 default y
1093 help
1094 This option provides functionality to read additional microcode data
1095 at the beginning of initrd image. The data tells kernel to load
1096 microcode to CPU's as early as possible. No functional change if no
1097 microcode data is glued to the initrd, therefore it's safe to say Y.
1098
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001099config X86_MSR
1100 tristate "/dev/cpu/*/msr - Model-specific register support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001101 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001102 This device gives privileged processes access to the x86
1103 Model-Specific Registers (MSRs). It is a character device with
1104 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
1105 MSR accesses are directed to a specific CPU on multi-processor
1106 systems.
1107
1108config X86_CPUID
1109 tristate "/dev/cpu/*/cpuid - CPU information support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001110 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001111 This device gives processes access to the x86 CPUID instruction to
1112 be executed on a specific processor. It is a character device
1113 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
1114 /dev/cpu/31/cpuid.
1115
1116choice
1117 prompt "High Memory Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001118 default HIGHMEM64G if X86_NUMAQ
Jan Beulich6fc108a2010-04-21 15:23:44 +01001119 default HIGHMEM4G
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001120 depends on X86_32
1121
1122config NOHIGHMEM
1123 bool "off"
1124 depends on !X86_NUMAQ
1125 ---help---
1126 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
1127 However, the address space of 32-bit x86 processors is only 4
1128 Gigabytes large. That means that, if you have a large amount of
1129 physical memory, not all of it can be "permanently mapped" by the
1130 kernel. The physical memory that's not permanently mapped is called
1131 "high memory".
1132
1133 If you are compiling a kernel which will never run on a machine with
1134 more than 1 Gigabyte total physical RAM, answer "off" here (default
1135 choice and suitable for most users). This will result in a "3GB/1GB"
1136 split: 3GB are mapped so that each process sees a 3GB virtual memory
1137 space and the remaining part of the 4GB virtual memory space is used
1138 by the kernel to permanently map as much physical memory as
1139 possible.
1140
1141 If the machine has between 1 and 4 Gigabytes physical RAM, then
1142 answer "4GB" here.
1143
1144 If more than 4 Gigabytes is used then answer "64GB" here. This
1145 selection turns Intel PAE (Physical Address Extension) mode on.
1146 PAE implements 3-level paging on IA32 processors. PAE is fully
1147 supported by Linux, PAE mode is implemented on all recent Intel
1148 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
1149 then the kernel will not boot on CPUs that don't support PAE!
1150
1151 The actual amount of total physical memory will either be
1152 auto detected or can be forced by using a kernel command line option
1153 such as "mem=256M". (Try "man bootparam" or see the documentation of
1154 your boot loader (lilo or loadlin) about how to pass options to the
1155 kernel at boot time.)
1156
1157 If unsure, say "off".
1158
1159config HIGHMEM4G
1160 bool "4GB"
1161 depends on !X86_NUMAQ
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001162 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001163 Select this if you have a 32-bit processor and between 1 and 4
1164 gigabytes of physical RAM.
1165
1166config HIGHMEM64G
1167 bool "64GB"
H. Peter Anvineb068e72012-11-28 11:50:23 -08001168 depends on !M486
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001169 select X86_PAE
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001170 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001171 Select this if you have a 32-bit processor and more than 4
1172 gigabytes of physical RAM.
1173
1174endchoice
1175
1176choice
David Rientjes6a108a12011-01-20 14:44:16 -08001177 prompt "Memory split" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001178 default VMSPLIT_3G
1179 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001180 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001181 Select the desired split between kernel and user memory.
1182
1183 If the address range available to the kernel is less than the
1184 physical memory installed, the remaining memory will be available
1185 as "high memory". Accessing high memory is a little more costly
1186 than low memory, as it needs to be mapped into the kernel first.
1187 Note that increasing the kernel address space limits the range
1188 available to user programs, making the address space there
1189 tighter. Selecting anything other than the default 3G/1G split
1190 will also likely make your kernel incompatible with binary-only
1191 kernel modules.
1192
1193 If you are not absolutely sure what you are doing, leave this
1194 option alone!
1195
1196 config VMSPLIT_3G
1197 bool "3G/1G user/kernel split"
1198 config VMSPLIT_3G_OPT
1199 depends on !X86_PAE
1200 bool "3G/1G user/kernel split (for full 1G low memory)"
1201 config VMSPLIT_2G
1202 bool "2G/2G user/kernel split"
1203 config VMSPLIT_2G_OPT
1204 depends on !X86_PAE
1205 bool "2G/2G user/kernel split (for full 2G low memory)"
1206 config VMSPLIT_1G
1207 bool "1G/3G user/kernel split"
1208endchoice
1209
1210config PAGE_OFFSET
1211 hex
1212 default 0xB0000000 if VMSPLIT_3G_OPT
1213 default 0x80000000 if VMSPLIT_2G
1214 default 0x78000000 if VMSPLIT_2G_OPT
1215 default 0x40000000 if VMSPLIT_1G
1216 default 0xC0000000
1217 depends on X86_32
1218
1219config HIGHMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001220 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001221 depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001222
1223config X86_PAE
Jan Beulich9ba16082008-10-15 22:01:38 -07001224 bool "PAE (Physical Address Extension) Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001225 depends on X86_32 && !HIGHMEM4G
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001226 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001227 PAE is required for NX support, and furthermore enables
1228 larger swapspace support for non-overcommit purposes. It
1229 has the cost of more pagetable lookup overhead, and also
1230 consumes more pagetable space per process.
1231
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001232config ARCH_PHYS_ADDR_T_64BIT
Jan Beulich3120e252012-09-10 12:41:45 +01001233 def_bool y
1234 depends on X86_64 || X86_PAE
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001235
FUJITA Tomonori66f2b062010-10-20 15:55:35 -07001236config ARCH_DMA_ADDR_T_64BIT
Jan Beulich3120e252012-09-10 12:41:45 +01001237 def_bool y
1238 depends on X86_64 || HIGHMEM64G
FUJITA Tomonori66f2b062010-10-20 15:55:35 -07001239
Nick Piggin9e899812008-10-22 12:33:16 +02001240config DIRECT_GBPAGES
David Rientjes6a108a12011-01-20 14:44:16 -08001241 bool "Enable 1GB pages for kernel pagetables" if EXPERT
Nick Piggin9e899812008-10-22 12:33:16 +02001242 default y
1243 depends on X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001244 ---help---
Nick Piggin9e899812008-10-22 12:33:16 +02001245 Allow the kernel linear mapping to use 1GB pages on CPUs that
1246 support it. This can improve the kernel's performance a tiny bit by
1247 reducing TLB pressure. If in doubt, say "Y".
1248
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001249# Common NUMA Features
1250config NUMA
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001251 bool "Numa Memory Allocation and Scheduler Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001252 depends on SMP
Kees Cook6ea30382012-10-02 11:16:47 -07001253 depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI))
Yinghai Lu0699eae2008-06-17 15:39:01 -07001254 default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001255 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001256 Enable NUMA (Non Uniform Memory Access) support.
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001257
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001258 The kernel will try to allocate memory used by a CPU on the
1259 local memory controller of the CPU and add some more
1260 NUMA awareness to the kernel.
1261
Ingo Molnarc280ea52008-11-08 13:29:45 +01001262 For 64-bit this is recommended if the system is Intel Core i7
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001263 (or later), AMD Opteron, or EM64T NUMA.
1264
1265 For 32-bit this is only needed on (rare) 32-bit-only platforms
1266 that support NUMA topologies, such as NUMAQ / Summit, or if you
1267 boot a 32-bit kernel on a 64-bit NUMA platform.
1268
1269 Otherwise, you should say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001270
1271comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
1272 depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
1273
Hans Rosenfeldeec1d4f2010-10-29 17:14:30 +02001274config AMD_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001275 def_bool y
1276 prompt "Old style AMD Opteron NUMA detection"
Tejun Heo5da0ef92011-07-11 10:34:32 +02001277 depends on X86_64 && NUMA && PCI
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001278 ---help---
Hans Rosenfeldeec1d4f2010-10-29 17:14:30 +02001279 Enable AMD NUMA node topology detection. You should say Y here if
1280 you have a multi processor AMD system. This uses an old method to
1281 read the NUMA configuration directly from the builtin Northbridge
1282 of Opteron. It is recommended to use X86_64_ACPI_NUMA instead,
1283 which also takes priority if both are compiled in.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001284
1285config X86_64_ACPI_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001286 def_bool y
1287 prompt "ACPI NUMA detection"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001288 depends on X86_64 && NUMA && ACPI && PCI
1289 select ACPI_NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001290 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001291 Enable ACPI SRAT based node topology detection.
1292
Suresh Siddha6ec6e0d2008-03-25 10:14:35 -07001293# Some NUMA nodes have memory ranges that span
1294# other nodes. Even though a pfn is valid and
1295# between a node's start and end pfns, it may not
1296# reside on that node. See memmap_init_zone()
1297# for details.
1298config NODES_SPAN_OTHER_NODES
1299 def_bool y
1300 depends on X86_64_ACPI_NUMA
1301
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001302config NUMA_EMU
1303 bool "NUMA emulation"
Tejun Heo1b7e03e2011-05-02 17:24:48 +02001304 depends on NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001305 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001306 Enable NUMA emulation. A flat machine will be split
1307 into virtual nodes when booted with "numa=fake=N", where N is the
1308 number of nodes. This is only useful for debugging.
1309
1310config NODES_SHIFT
Linus Torvaldsd25e26b2008-08-25 14:15:38 -07001311 int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
David Rientjes51591e32010-03-25 15:39:27 -07001312 range 1 10
1313 default "10" if MAXSMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001314 default "6" if X86_64
1315 default "4" if X86_NUMAQ
1316 default "3"
1317 depends on NEED_MULTIPLE_NODES
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001318 ---help---
Mike Travis1184dc22008-05-12 21:21:12 +02001319 Specify the maximum number of NUMA Nodes available on the target
Matt LaPlante692105b2009-01-26 11:12:25 +01001320 system. Increases memory reserved to accommodate various tables.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001321
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001322config ARCH_HAVE_MEMORY_PRESENT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001323 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001324 depends on X86_32 && DISCONTIGMEM
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001325
1326config NEED_NODE_MEMMAP_SIZE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001327 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001328 depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001329
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001330config ARCH_FLATMEM_ENABLE
1331 def_bool y
Tejun Heo3b166512011-04-01 11:15:12 +02001332 depends on X86_32 && !NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001333
1334config ARCH_DISCONTIGMEM_ENABLE
1335 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001336 depends on NUMA && X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001337
1338config ARCH_DISCONTIGMEM_DEFAULT
1339 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001340 depends on NUMA && X86_32
1341
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001342config ARCH_SPARSEMEM_ENABLE
1343 def_bool y
Kees Cook6ea30382012-10-02 11:16:47 -07001344 depends on X86_64 || NUMA || X86_32 || X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001345 select SPARSEMEM_STATIC if X86_32
1346 select SPARSEMEM_VMEMMAP_ENABLE if X86_64
1347
Tejun Heo3b166512011-04-01 11:15:12 +02001348config ARCH_SPARSEMEM_DEFAULT
1349 def_bool y
1350 depends on X86_64
1351
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001352config ARCH_SELECT_MEMORY_MODEL
1353 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001354 depends on ARCH_SPARSEMEM_ENABLE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001355
1356config ARCH_MEMORY_PROBE
Toshi Kania0842b72013-07-19 11:47:48 -06001357 bool "Enable sysfs memory/probe interface"
Jan Beulich3120e252012-09-10 12:41:45 +01001358 depends on X86_64 && MEMORY_HOTPLUG
Toshi Kania0842b72013-07-19 11:47:48 -06001359 help
1360 This option enables a sysfs memory/probe interface for testing.
1361 See Documentation/memory-hotplug.txt for more information.
1362 If you are unsure how to answer this question, answer N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001363
Tejun Heo3b166512011-04-01 11:15:12 +02001364config ARCH_PROC_KCORE_TEXT
1365 def_bool y
1366 depends on X86_64 && PROC_KCORE
1367
Avi Kivitya29815a2010-01-10 16:28:09 +02001368config ILLEGAL_POINTER_VALUE
1369 hex
1370 default 0 if X86_32
1371 default 0xdead000000000000 if X86_64
1372
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001373source "mm/Kconfig"
1374
1375config HIGHPTE
1376 bool "Allocate 3rd-level pagetables from highmem"
Jan Beulich6fc108a2010-04-21 15:23:44 +01001377 depends on HIGHMEM
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001378 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001379 The VM uses one page table entry for each page of physical memory.
1380 For systems with a lot of RAM, this can be wasteful of precious
1381 low memory. Setting this option will put user-space page table
1382 entries in high memory.
1383
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001384config X86_CHECK_BIOS_CORRUPTION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001385 bool "Check for low memory corruption"
1386 ---help---
1387 Periodically check for memory corruption in low memory, which
1388 is suspected to be caused by BIOS. Even when enabled in the
1389 configuration, it is disabled at runtime. Enable it by
1390 setting "memory_corruption_check=1" on the kernel command
1391 line. By default it scans the low 64k of memory every 60
1392 seconds; see the memory_corruption_check_size and
1393 memory_corruption_check_period parameters in
1394 Documentation/kernel-parameters.txt to adjust this.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001395
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001396 When enabled with the default parameters, this option has
1397 almost no overhead, as it reserves a relatively small amount
1398 of memory and scans it infrequently. It both detects corruption
1399 and prevents it from affecting the running system.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001400
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001401 It is, however, intended as a diagnostic tool; if repeatable
1402 BIOS-originated corruption always affects the same memory,
1403 you can use memmap= to prevent the kernel from using that
1404 memory.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001405
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001406config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001407 bool "Set the default setting of memory_corruption_check"
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001408 depends on X86_CHECK_BIOS_CORRUPTION
1409 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001410 ---help---
1411 Set whether the default state of memory_corruption_check is
1412 on or off.
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001413
H. Peter Anvin9ea77bd2010-08-25 16:38:20 -07001414config X86_RESERVE_LOW
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001415 int "Amount of low memory, in kilobytes, to reserve for the BIOS"
1416 default 64
1417 range 4 640
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001418 ---help---
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001419 Specify the amount of low memory to reserve for the BIOS.
Ingo Molnarfc381512008-09-16 10:07:34 +02001420
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001421 The first page contains BIOS data structures that the kernel
1422 must not use, so that page must always be reserved.
Ingo Molnarfc381512008-09-16 10:07:34 +02001423
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001424 By default we reserve the first 64K of physical RAM, as a
1425 number of BIOSes are known to corrupt that memory range
1426 during events such as suspend/resume or monitor cable
1427 insertion, so it must not be used by the kernel.
Ingo Molnarfc381512008-09-16 10:07:34 +02001428
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001429 You can set this to 4 if you are absolutely sure that you
1430 trust the BIOS to get all its memory reservations and usages
1431 right. If you know your BIOS have problems beyond the
1432 default 64K area, you can set this to 640 to avoid using the
1433 entire low memory range.
1434
1435 If you have doubts about the BIOS (e.g. suspend/resume does
1436 not work or there's kernel crashes after certain hardware
1437 hotplug events) then you might want to enable
1438 X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check
1439 typical corruption patterns.
1440
1441 Leave this to the default value of 64 if you are unsure.
Ingo Molnarfc381512008-09-16 10:07:34 +02001442
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001443config MATH_EMULATION
1444 bool
1445 prompt "Math emulation" if X86_32
1446 ---help---
1447 Linux can emulate a math coprocessor (used for floating point
1448 operations) if you don't have one. 486DX and Pentium processors have
1449 a math coprocessor built in, 486SX and 386 do not, unless you added
1450 a 487DX or 387, respectively. (The messages during boot time can
1451 give you some hints here ["man dmesg"].) Everyone needs either a
1452 coprocessor or this emulation.
1453
1454 If you don't have a math coprocessor, you need to say Y here; if you
1455 say Y here even though you have a coprocessor, the coprocessor will
1456 be used nevertheless. (This behavior can be changed with the kernel
1457 command line option "no387", which comes handy if your coprocessor
1458 is broken. Try "man bootparam" or see the documentation of your boot
1459 loader (lilo or loadlin) about how to pass options to the kernel at
1460 boot time.) This means that it is a good idea to say Y here if you
1461 intend to use this kernel on different machines.
1462
1463 More information about the internals of the Linux math coprocessor
1464 emulation can be found in <file:arch/x86/math-emu/README>.
1465
1466 If you are not sure, say Y; apart from resulting in a 66 KB bigger
1467 kernel, it won't hurt.
1468
1469config MTRR
Jan Beulich6fc108a2010-04-21 15:23:44 +01001470 def_bool y
David Rientjes6a108a12011-01-20 14:44:16 -08001471 prompt "MTRR (Memory Type Range Register) support" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001472 ---help---
1473 On Intel P6 family processors (Pentium Pro, Pentium II and later)
1474 the Memory Type Range Registers (MTRRs) may be used to control
1475 processor access to memory ranges. This is most useful if you have
1476 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
1477 allows bus write transfers to be combined into a larger transfer
1478 before bursting over the PCI/AGP bus. This can increase performance
1479 of image write operations 2.5 times or more. Saying Y here creates a
1480 /proc/mtrr file which may be used to manipulate your processor's
1481 MTRRs. Typically the X server should use this.
1482
1483 This code has a reasonably generic interface so that similar
1484 control registers on other processors can be easily supported
1485 as well:
1486
1487 The Cyrix 6x86, 6x86MX and M II processors have Address Range
1488 Registers (ARRs) which provide a similar functionality to MTRRs. For
1489 these, the ARRs are used to emulate the MTRRs.
1490 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
1491 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
1492 write-combining. All of these processors are supported by this code
1493 and it makes sense to say Y here if you have one of them.
1494
1495 Saying Y here also fixes a problem with buggy SMP BIOSes which only
1496 set the MTRRs for the boot CPU and not for the secondary CPUs. This
1497 can lead to all sorts of problems, so it's good to say Y here.
1498
1499 You can safely say Y even if your machine doesn't have MTRRs, you'll
1500 just add about 9 KB to your kernel.
1501
Randy Dunlap7225e752008-07-26 17:54:22 -07001502 See <file:Documentation/x86/mtrr.txt> for more information.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001503
Yinghai Lu95ffa242008-04-29 03:52:33 -07001504config MTRR_SANITIZER
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001505 def_bool y
Yinghai Lu95ffa242008-04-29 03:52:33 -07001506 prompt "MTRR cleanup support"
1507 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001508 ---help---
Thomas Gleixneraba37282008-07-15 14:48:48 +02001509 Convert MTRR layout from continuous to discrete, so X drivers can
1510 add writeback entries.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001511
Thomas Gleixneraba37282008-07-15 14:48:48 +02001512 Can be disabled with disable_mtrr_cleanup on the kernel command line.
Matt LaPlante692105b2009-01-26 11:12:25 +01001513 The largest mtrr entry size for a continuous block can be set with
Thomas Gleixneraba37282008-07-15 14:48:48 +02001514 mtrr_chunk_size.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001515
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001516 If unsure, say Y.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001517
1518config MTRR_SANITIZER_ENABLE_DEFAULT
Yinghai Luf5098d62008-04-29 20:25:58 -07001519 int "MTRR cleanup enable value (0-1)"
1520 range 0 1
1521 default "0"
Yinghai Lu95ffa242008-04-29 03:52:33 -07001522 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001523 ---help---
Yinghai Luf5098d62008-04-29 20:25:58 -07001524 Enable mtrr cleanup default value
Yinghai Lu95ffa242008-04-29 03:52:33 -07001525
Yinghai Lu12031a62008-05-02 02:40:22 -07001526config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
1527 int "MTRR cleanup spare reg num (0-7)"
1528 range 0 7
1529 default "1"
1530 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001531 ---help---
Yinghai Lu12031a62008-05-02 02:40:22 -07001532 mtrr cleanup spare entries default, it can be changed via
Thomas Gleixneraba37282008-07-15 14:48:48 +02001533 mtrr_spare_reg_nr=N on the kernel command line.
Yinghai Lu12031a62008-05-02 02:40:22 -07001534
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001535config X86_PAT
Jan Beulich6fc108a2010-04-21 15:23:44 +01001536 def_bool y
David Rientjes6a108a12011-01-20 14:44:16 -08001537 prompt "x86 PAT support" if EXPERT
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001538 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001539 ---help---
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001540 Use PAT attributes to setup page level cache control.
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001541
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001542 PATs are the modern equivalents of MTRRs and are much more
1543 flexible than MTRRs.
1544
1545 Say N here if you see bootup problems (boot crash, boot hang,
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001546 spontaneous reboots) or a non-working video driver.
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001547
1548 If unsure, say Y.
1549
Venkatesh Pallipadi46cf98c2009-07-10 09:57:37 -07001550config ARCH_USES_PG_UNCACHED
1551 def_bool y
1552 depends on X86_PAT
1553
H. Peter Anvin628c6242011-07-31 13:59:29 -07001554config ARCH_RANDOM
1555 def_bool y
1556 prompt "x86 architectural random number generator" if EXPERT
1557 ---help---
1558 Enable the x86 architectural RDRAND instruction
1559 (Intel Bull Mountain technology) to generate random numbers.
1560 If supported, this is a high bandwidth, cryptographically
1561 secure hardware random number generator.
1562
H. Peter Anvin51ae4a22012-09-21 12:43:10 -07001563config X86_SMAP
1564 def_bool y
1565 prompt "Supervisor Mode Access Prevention" if EXPERT
1566 ---help---
1567 Supervisor Mode Access Prevention (SMAP) is a security
1568 feature in newer Intel processors. There is a small
1569 performance cost if this enabled and turned on; there is
1570 also a small increase in the kernel size if this is enabled.
1571
1572 If unsure, say Y.
1573
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001574config EFI
Jan Beulich9ba16082008-10-15 22:01:38 -07001575 bool "EFI runtime service support"
Huang, Ying5b836832008-01-30 13:31:19 +01001576 depends on ACPI
Sergey Vlasovf6ce5002013-04-16 18:31:08 +04001577 select UCS2_STRING
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001578 ---help---
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001579 This enables the kernel to use EFI runtime services that are
1580 available (such as the EFI variable services).
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001581
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001582 This option is only useful on systems that have EFI firmware.
1583 In addition, you should use the latest ELILO loader available
1584 at <http://elilo.sourceforge.net> in order to take advantage
1585 of EFI runtime services. However, even with this option, the
1586 resultant kernel should continue to boot on existing non-EFI
1587 platforms.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001588
Matt Fleming291f3632011-12-12 21:27:52 +00001589config EFI_STUB
1590 bool "EFI stub support"
1591 depends on EFI
1592 ---help---
1593 This kernel feature allows a bzImage to be loaded directly
1594 by EFI firmware without the use of a bootloader.
1595
Matt Fleming0c759662012-03-16 12:03:13 +00001596 See Documentation/x86/efi-stub.txt for more information.
1597
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001598config SECCOMP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001599 def_bool y
1600 prompt "Enable seccomp to safely compute untrusted bytecode"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001601 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001602 This kernel feature is useful for number crunching applications
1603 that may need to compute untrusted bytecode during their
1604 execution. By using pipes or other transports made available to
1605 the process as file descriptors supporting the read/write
1606 syscalls, it's possible to isolate those applications in
1607 their own address space using seccomp. Once seccomp is
Alexey Dobriyan9c0bbee2008-09-09 11:01:31 +04001608 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001609 and the task is only allowed to execute a few safe syscalls
1610 defined by each seccomp mode.
1611
1612 If unsure, say Y. Only embedded should say N here.
1613
1614config CC_STACKPROTECTOR
Jean Delvare2a8ac742012-07-06 16:08:25 +02001615 bool "Enable -fstack-protector buffer overflow detection"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001616 ---help---
1617 This option turns on the -fstack-protector GCC feature. This
Ingo Molnar113c5412008-02-14 10:36:03 +01001618 feature puts, at the beginning of functions, a canary value on
1619 the stack just before the return address, and validates
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001620 the value just before actually returning. Stack based buffer
1621 overflows (that need to overwrite this return address) now also
1622 overwrite the canary, which gets detected and the attack is then
1623 neutralized via a kernel panic.
1624
1625 This feature requires gcc version 4.2 or above, or a distribution
1626 gcc with the feature backported. Older versions are automatically
Ingo Molnar113c5412008-02-14 10:36:03 +01001627 detected and for those versions, this configuration option is
1628 ignored. (and a warning is printed during bootup)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001629
1630source kernel/Kconfig.hz
1631
1632config KEXEC
1633 bool "kexec system call"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001634 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001635 kexec is a system call that implements the ability to shutdown your
1636 current kernel, and to start another kernel. It is like a reboot
1637 but it is independent of the system firmware. And like a reboot
1638 you can start any kernel with it, not just Linux.
1639
1640 The name comes from the similarity to the exec system call.
1641
1642 It is an ongoing process to be certain the hardware in a machine
1643 is properly shutdown, so do not be surprised if this code does not
Geert Uytterhoevenbf220692013-08-20 21:38:03 +02001644 initially work for you. As of this writing the exact hardware
1645 interface is strongly in flux, so no good recommendation can be
1646 made.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001647
1648config CRASH_DUMP
Pavel Machek04b69442008-08-14 17:16:50 +02001649 bool "kernel crash dumps"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001650 depends on X86_64 || (X86_32 && HIGHMEM)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001651 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001652 Generate crash dump after being started by kexec.
1653 This should be normally only set in special crash dump kernels
1654 which are loaded in the main kernel with kexec-tools into
1655 a specially reserved region and then later executed after
1656 a crash by kdump/kexec. The crash dump kernel must be compiled
1657 to a memory address not used by the main kernel or BIOS using
1658 PHYSICAL_START, or it must be built as a relocatable image
1659 (CONFIG_RELOCATABLE=y).
1660 For more details see Documentation/kdump/kdump.txt
1661
Huang Ying3ab83522008-07-25 19:45:07 -07001662config KEXEC_JUMP
Kees Cook6ea30382012-10-02 11:16:47 -07001663 bool "kexec jump"
Huang Yingfee7b0d2009-03-10 10:57:16 +08001664 depends on KEXEC && HIBERNATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001665 ---help---
Huang Ying89081d12008-07-25 19:45:10 -07001666 Jump between original kernel and kexeced kernel and invoke
1667 code in physical address mode via KEXEC
Huang Ying3ab83522008-07-25 19:45:07 -07001668
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001669config PHYSICAL_START
David Rientjes6a108a12011-01-20 14:44:16 -08001670 hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP)
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001671 default "0x1000000"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001672 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001673 This gives the physical address where the kernel is loaded.
1674
1675 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
1676 bzImage will decompress itself to above physical address and
1677 run from there. Otherwise, bzImage will run from the address where
1678 it has been loaded by the boot loader and will ignore above physical
1679 address.
1680
1681 In normal kdump cases one does not have to set/change this option
1682 as now bzImage can be compiled as a completely relocatable image
1683 (CONFIG_RELOCATABLE=y) and be used to load and run from a different
1684 address. This option is mainly useful for the folks who don't want
1685 to use a bzImage for capturing the crash dump and want to use a
1686 vmlinux instead. vmlinux is not relocatable hence a kernel needs
1687 to be specifically compiled to run from a specific memory area
1688 (normally a reserved region) and this option comes handy.
1689
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001690 So if you are using bzImage for capturing the crash dump,
1691 leave the value here unchanged to 0x1000000 and set
1692 CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux
1693 for capturing the crash dump change this value to start of
1694 the reserved region. In other words, it can be set based on
1695 the "X" value as specified in the "crashkernel=YM@XM"
1696 command line boot parameter passed to the panic-ed
1697 kernel. Please take a look at Documentation/kdump/kdump.txt
1698 for more details about crash dumps.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001699
1700 Usage of bzImage for capturing the crash dump is recommended as
1701 one does not have to build two kernels. Same kernel can be used
1702 as production kernel and capture kernel. Above option should have
1703 gone away after relocatable bzImage support is introduced. But it
1704 is present because there are users out there who continue to use
1705 vmlinux for dump capture. This option should go away down the
1706 line.
1707
1708 Don't change this unless you know what you are doing.
1709
1710config RELOCATABLE
H. Peter Anvin26717802009-05-07 14:19:34 -07001711 bool "Build a relocatable kernel"
1712 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001713 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001714 This builds a kernel image that retains relocation information
1715 so it can be loaded someplace besides the default 1MB.
1716 The relocations tend to make the kernel binary about 10% larger,
1717 but are discarded at runtime.
1718
1719 One use is for the kexec on panic case where the recovery kernel
1720 must live at a different physical address than the primary
1721 kernel.
1722
1723 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
1724 it has been loaded at and the compile time physical address
1725 (CONFIG_PHYSICAL_START) is ignored.
1726
H. Peter Anvin845adf72009-05-05 21:20:51 -07001727# Relocation on x86-32 needs some additional build support
1728config X86_NEED_RELOCS
1729 def_bool y
1730 depends on X86_32 && RELOCATABLE
1731
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001732config PHYSICAL_ALIGN
Kees Cooka0215062013-07-08 09:15:17 -07001733 hex "Alignment value to which kernel should be aligned"
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001734 default "0x1000000"
Kees Cooka0215062013-07-08 09:15:17 -07001735 range 0x2000 0x1000000 if X86_32
1736 range 0x200000 0x1000000 if X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001737 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001738 This value puts the alignment restrictions on physical address
1739 where kernel is loaded and run from. Kernel is compiled for an
1740 address which meets above alignment restriction.
1741
1742 If bootloader loads the kernel at a non-aligned address and
1743 CONFIG_RELOCATABLE is set, kernel will move itself to nearest
1744 address aligned to above value and run from there.
1745
1746 If bootloader loads the kernel at a non-aligned address and
1747 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
1748 load address and decompress itself to the address it has been
1749 compiled for and run from there. The address for which kernel is
1750 compiled already meets above alignment restrictions. Hence the
1751 end result is that kernel runs from a physical address meeting
1752 above alignment restrictions.
1753
Kees Cooka0215062013-07-08 09:15:17 -07001754 On 32-bit this value must be a multiple of 0x2000. On 64-bit
1755 this value must be a multiple of 0x200000.
1756
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001757 Don't change this unless you know what you are doing.
1758
1759config HOTPLUG_CPU
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001760 bool "Support for hot-pluggable CPUs"
Stephen Rothwell40b31362013-05-21 13:49:35 +10001761 depends on SMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001762 ---help---
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001763 Say Y here to allow turning CPUs off and on. CPUs can be
1764 controlled through /sys/devices/system/cpu.
1765 ( Note: power management support will enable this option
1766 automatically on SMP systems. )
1767 Say N if you want to disable CPU hotplug.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001768
Fenghua Yu80aa1df2012-11-13 11:32:39 -08001769config BOOTPARAM_HOTPLUG_CPU0
1770 bool "Set default setting of cpu0_hotpluggable"
1771 default n
Kees Cook2c922cd2013-01-22 13:01:19 -08001772 depends on HOTPLUG_CPU
Fenghua Yu80aa1df2012-11-13 11:32:39 -08001773 ---help---
1774 Set whether default state of cpu0_hotpluggable is on or off.
1775
1776 Say Y here to enable CPU0 hotplug by default. If this switch
1777 is turned on, there is no need to give cpu0_hotplug kernel
1778 parameter and the CPU0 hotplug feature is enabled by default.
1779
1780 Please note: there are two known CPU0 dependencies if you want
1781 to enable the CPU0 hotplug feature either by this switch or by
1782 cpu0_hotplug kernel parameter.
1783
1784 First, resume from hibernate or suspend always starts from CPU0.
1785 So hibernate and suspend are prevented if CPU0 is offline.
1786
1787 Second dependency is PIC interrupts always go to CPU0. CPU0 can not
1788 offline if any interrupt can not migrate out of CPU0. There may
1789 be other CPU0 dependencies.
1790
1791 Please make sure the dependencies are under your control before
1792 you enable this feature.
1793
1794 Say N if you don't want to enable CPU0 hotplug feature by default.
1795 You still can enable the CPU0 hotplug feature at boot by kernel
1796 parameter cpu0_hotplug.
1797
Fenghua Yua71c8bc2012-11-13 11:32:51 -08001798config DEBUG_HOTPLUG_CPU0
1799 def_bool n
1800 prompt "Debug CPU0 hotplug"
Kees Cook2c922cd2013-01-22 13:01:19 -08001801 depends on HOTPLUG_CPU
Fenghua Yua71c8bc2012-11-13 11:32:51 -08001802 ---help---
1803 Enabling this option offlines CPU0 (if CPU0 can be offlined) as
1804 soon as possible and boots up userspace with CPU0 offlined. User
1805 can online CPU0 back after boot time.
1806
1807 To debug CPU0 hotplug, you need to enable CPU0 offline/online
1808 feature by either turning on CONFIG_BOOTPARAM_HOTPLUG_CPU0 during
1809 compilation or giving cpu0_hotplug kernel parameter at boot.
1810
1811 If unsure, say N.
1812
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001813config COMPAT_VDSO
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001814 def_bool y
1815 prompt "Compat VDSO support"
Roland McGrathaf65d642008-01-30 13:30:43 +01001816 depends on X86_32 || IA32_EMULATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001817 ---help---
Roland McGrathaf65d642008-01-30 13:30:43 +01001818 Map the 32-bit VDSO to the predictable old-style address too.
Randy Dunlape84446d2009-11-10 15:46:52 -08001819
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001820 Say N here if you are running a sufficiently recent glibc
1821 version (2.3.3 or later), to remove the high-mapped
1822 VDSO mapping and to exclusively use the randomized VDSO.
1823
1824 If unsure, say Y.
1825
Tim Bird516cbf32008-08-12 12:52:36 -07001826config CMDLINE_BOOL
1827 bool "Built-in kernel command line"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001828 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001829 Allow for specifying boot arguments to the kernel at
1830 build time. On some systems (e.g. embedded ones), it is
1831 necessary or convenient to provide some or all of the
1832 kernel boot arguments with the kernel itself (that is,
1833 to not rely on the boot loader to provide them.)
1834
1835 To compile command line arguments into the kernel,
1836 set this option to 'Y', then fill in the
1837 the boot arguments in CONFIG_CMDLINE.
1838
1839 Systems with fully functional boot loaders (i.e. non-embedded)
1840 should leave this option set to 'N'.
1841
1842config CMDLINE
1843 string "Built-in kernel command string"
1844 depends on CMDLINE_BOOL
1845 default ""
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001846 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001847 Enter arguments here that should be compiled into the kernel
1848 image and used at boot time. If the boot loader provides a
1849 command line at boot time, it is appended to this string to
1850 form the full kernel command line, when the system boots.
1851
1852 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
1853 change this behavior.
1854
1855 In most cases, the command line (whether built-in or provided
1856 by the boot loader) should specify the device for the root
1857 file system.
1858
1859config CMDLINE_OVERRIDE
1860 bool "Built-in command line overrides boot loader arguments"
Tim Bird516cbf32008-08-12 12:52:36 -07001861 depends on CMDLINE_BOOL
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001862 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001863 Set this option to 'Y' to have the kernel ignore the boot loader
1864 command line, and use ONLY the built-in command line.
1865
1866 This is used to work around broken boot loaders. This should
1867 be set to 'N' under normal conditions.
1868
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001869endmenu
1870
1871config ARCH_ENABLE_MEMORY_HOTPLUG
1872 def_bool y
1873 depends on X86_64 || (X86_32 && HIGHMEM)
1874
Gary Hade35551052008-10-31 10:52:03 -07001875config ARCH_ENABLE_MEMORY_HOTREMOVE
1876 def_bool y
1877 depends on MEMORY_HOTPLUG
1878
Lee Schermerhorne534c7c2010-05-26 14:44:58 -07001879config USE_PERCPU_NUMA_NODE_ID
Tejun Heo645a7912011-01-23 14:37:40 +01001880 def_bool y
Lee Schermerhorne534c7c2010-05-26 14:44:58 -07001881 depends on NUMA
1882
Bjorn Helgaasda85f862008-11-05 13:37:27 -06001883menu "Power management and ACPI options"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001884
1885config ARCH_HIBERNATION_HEADER
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001886 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001887 depends on X86_64 && HIBERNATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001888
1889source "kernel/power/Kconfig"
1890
1891source "drivers/acpi/Kconfig"
1892
Feng Tangefafc8b2009-08-14 15:23:29 -04001893source "drivers/sfi/Kconfig"
1894
Andi Kleena6b68072008-01-30 13:32:49 +01001895config X86_APM_BOOT
Jan Beulich6fc108a2010-04-21 15:23:44 +01001896 def_bool y
Paul Bolle282e5aa2011-11-17 11:41:31 +01001897 depends on APM
Andi Kleena6b68072008-01-30 13:32:49 +01001898
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001899menuconfig APM
1900 tristate "APM (Advanced Power Management) BIOS support"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001901 depends on X86_32 && PM_SLEEP
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001902 ---help---
1903 APM is a BIOS specification for saving power using several different
1904 techniques. This is mostly useful for battery powered laptops with
1905 APM compliant BIOSes. If you say Y here, the system time will be
1906 reset after a RESUME operation, the /proc/apm device will provide
1907 battery status information, and user-space programs will receive
1908 notification of APM "events" (e.g. battery status change).
1909
1910 If you select "Y" here, you can disable actual use of the APM
1911 BIOS by passing the "apm=off" option to the kernel at boot time.
1912
1913 Note that the APM support is almost completely disabled for
1914 machines with more than one CPU.
1915
1916 In order to use APM, you will need supporting software. For location
Michael Witten2dc98fd2011-07-08 21:11:16 +00001917 and more information, read <file:Documentation/power/apm-acpi.txt>
1918 and the Battery Powered Linux mini-HOWTO, available from
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001919 <http://www.tldp.org/docs.html#howto>.
1920
1921 This driver does not spin down disk drives (see the hdparm(8)
1922 manpage ("man 8 hdparm") for that), and it doesn't turn off
1923 VESA-compliant "green" monitors.
1924
1925 This driver does not support the TI 4000M TravelMate and the ACER
1926 486/DX4/75 because they don't have compliant BIOSes. Many "green"
1927 desktop machines also don't have compliant BIOSes, and this driver
1928 may cause those machines to panic during the boot phase.
1929
1930 Generally, if you don't have a battery in your machine, there isn't
1931 much point in using this driver and you should say N. If you get
1932 random kernel OOPSes or reboots that don't seem to be related to
1933 anything, try disabling/enabling this option (or disabling/enabling
1934 APM in your BIOS).
1935
1936 Some other things you should try when experiencing seemingly random,
1937 "weird" problems:
1938
1939 1) make sure that you have enough swap space and that it is
1940 enabled.
1941 2) pass the "no-hlt" option to the kernel
1942 3) switch on floating point emulation in the kernel and pass
1943 the "no387" option to the kernel
1944 4) pass the "floppy=nodma" option to the kernel
1945 5) pass the "mem=4M" option to the kernel (thereby disabling
1946 all but the first 4 MB of RAM)
1947 6) make sure that the CPU is not over clocked.
1948 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
1949 8) disable the cache from your BIOS settings
1950 9) install a fan for the video card or exchange video RAM
1951 10) install a better fan for the CPU
1952 11) exchange RAM chips
1953 12) exchange the motherboard.
1954
1955 To compile this driver as a module, choose M here: the
1956 module will be called apm.
1957
1958if APM
1959
1960config APM_IGNORE_USER_SUSPEND
1961 bool "Ignore USER SUSPEND"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001962 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001963 This option will ignore USER SUSPEND requests. On machines with a
1964 compliant APM BIOS, you want to say N. However, on the NEC Versa M
1965 series notebooks, it is necessary to say Y because of a BIOS bug.
1966
1967config APM_DO_ENABLE
1968 bool "Enable PM at boot time"
1969 ---help---
1970 Enable APM features at boot time. From page 36 of the APM BIOS
1971 specification: "When disabled, the APM BIOS does not automatically
1972 power manage devices, enter the Standby State, enter the Suspend
1973 State, or take power saving steps in response to CPU Idle calls."
1974 This driver will make CPU Idle calls when Linux is idle (unless this
1975 feature is turned off -- see "Do CPU IDLE calls", below). This
1976 should always save battery power, but more complicated APM features
1977 will be dependent on your BIOS implementation. You may need to turn
1978 this option off if your computer hangs at boot time when using APM
1979 support, or if it beeps continuously instead of suspending. Turn
1980 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
1981 T400CDT. This is off by default since most machines do fine without
1982 this feature.
1983
1984config APM_CPU_IDLE
Len Browndd8af072013-02-09 21:10:04 -05001985 depends on CPU_IDLE
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001986 bool "Make CPU Idle calls when idle"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001987 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001988 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
1989 On some machines, this can activate improved power savings, such as
1990 a slowed CPU clock rate, when the machine is idle. These idle calls
1991 are made after the idle loop has run for some length of time (e.g.,
1992 333 mS). On some machines, this will cause a hang at boot time or
1993 whenever the CPU becomes idle. (On machines with more than one CPU,
1994 this option does nothing.)
1995
1996config APM_DISPLAY_BLANK
1997 bool "Enable console blanking using APM"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001998 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001999 Enable console blanking using the APM. Some laptops can use this to
2000 turn off the LCD backlight when the screen blanker of the Linux
2001 virtual console blanks the screen. Note that this is only used by
2002 the virtual console screen blanker, and won't turn off the backlight
2003 when using the X Window system. This also doesn't have anything to
2004 do with your VESA-compliant power-saving monitor. Further, this
2005 option doesn't work for all laptops -- it might not turn off your
2006 backlight at all, or it might print a lot of errors to the console,
2007 especially if you are using gpm.
2008
2009config APM_ALLOW_INTS
2010 bool "Allow interrupts during APM BIOS calls"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002011 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002012 Normally we disable external interrupts while we are making calls to
2013 the APM BIOS as a measure to lessen the effects of a badly behaving
2014 BIOS implementation. The BIOS should reenable interrupts if it
2015 needs to. Unfortunately, some BIOSes do not -- especially those in
2016 many of the newer IBM Thinkpads. If you experience hangs when you
2017 suspend, try setting this to Y. Otherwise, say N.
2018
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002019endif # APM
2020
Dave Jonesbb0a56e2011-05-19 18:51:07 -04002021source "drivers/cpufreq/Kconfig"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002022
2023source "drivers/cpuidle/Kconfig"
2024
Andy Henroid27471fd2008-10-09 11:45:22 -07002025source "drivers/idle/Kconfig"
2026
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002027endmenu
2028
2029
2030menu "Bus options (PCI etc.)"
2031
2032config PCI
Ingo Molnar1ac97012008-05-19 14:10:14 +02002033 bool "PCI support"
Adrian Bunk1c858082008-01-30 13:32:32 +01002034 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002035 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002036 Find out whether you have a PCI motherboard. PCI is the name of a
2037 bus system, i.e. the way the CPU talks to the other stuff inside
2038 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
2039 VESA. If you have PCI, say Y, otherwise N.
2040
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002041choice
2042 prompt "PCI access mode"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02002043 depends on X86_32 && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002044 default PCI_GOANY
2045 ---help---
2046 On PCI systems, the BIOS can be used to detect the PCI devices and
2047 determine their configuration. However, some old PCI motherboards
2048 have BIOS bugs and may crash if this is done. Also, some embedded
2049 PCI-based systems don't have any BIOS at all. Linux can also try to
2050 detect the PCI hardware directly without using the BIOS.
2051
2052 With this option, you can specify how Linux should detect the
2053 PCI devices. If you choose "BIOS", the BIOS will be used,
2054 if you choose "Direct", the BIOS won't be used, and if you
2055 choose "MMConfig", then PCI Express MMCONFIG will be used.
2056 If you choose "Any", the kernel will try MMCONFIG, then the
2057 direct access method and falls back to the BIOS if that doesn't
2058 work. If unsure, go with the default, which is "Any".
2059
2060config PCI_GOBIOS
2061 bool "BIOS"
2062
2063config PCI_GOMMCONFIG
2064 bool "MMConfig"
2065
2066config PCI_GODIRECT
2067 bool "Direct"
2068
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002069config PCI_GOOLPC
Daniel Drake76fb6572010-09-23 17:28:04 +01002070 bool "OLPC XO-1"
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002071 depends on OLPC
2072
Andres Salomon2bdd1b02008-06-05 14:14:41 -07002073config PCI_GOANY
2074 bool "Any"
2075
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002076endchoice
2077
2078config PCI_BIOS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002079 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02002080 depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002081
2082# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
2083config PCI_DIRECT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002084 def_bool y
Shaohua Li0aba4962011-05-27 14:59:39 +08002085 depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC || PCI_GOMMCONFIG))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002086
2087config PCI_MMCONFIG
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002088 def_bool y
Feng Tang5f0db7a2009-08-14 15:37:50 -04002089 depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002090
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002091config PCI_OLPC
Andres Salomon2bdd1b02008-06-05 14:14:41 -07002092 def_bool y
2093 depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002094
Alex Nixonb5401a92010-03-18 16:31:34 -04002095config PCI_XEN
2096 def_bool y
2097 depends on PCI && XEN
2098 select SWIOTLB_XEN
2099
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002100config PCI_DOMAINS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002101 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002102 depends on PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002103
2104config PCI_MMCONFIG
2105 bool "Support mmconfig PCI config space access"
2106 depends on X86_64 && PCI && ACPI
2107
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07002108config PCI_CNB20LE_QUIRK
David Rientjes6a108a12011-01-20 14:44:16 -08002109 bool "Read CNB20LE Host Bridge Windows" if EXPERT
Kees Cook6ea30382012-10-02 11:16:47 -07002110 depends on PCI
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07002111 help
2112 Read the PCI windows out of the CNB20LE host bridge. This allows
2113 PCI hotplug to work on systems with the CNB20LE chipset which do
2114 not have ACPI.
2115
Bjorn Helgaas64a5fed2011-01-06 10:12:30 -07002116 There's no public spec for this chipset, and this functionality
2117 is known to be incomplete.
2118
2119 You should say N unless you know you need this.
2120
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002121source "drivers/pci/pcie/Kconfig"
2122
2123source "drivers/pci/Kconfig"
2124
David Rientjes1c00f012011-03-22 16:34:59 -07002125# x86_64 have no ISA slots, but can have ISA-style DMA.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002126config ISA_DMA_API
David Rientjes1c00f012011-03-22 16:34:59 -07002127 bool "ISA-style DMA support" if (X86_64 && EXPERT)
2128 default y
2129 help
2130 Enables ISA-style DMA support for devices requiring such controllers.
2131 If unsure, say Y.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002132
2133if X86_32
2134
2135config ISA
2136 bool "ISA support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002137 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002138 Find out whether you have ISA slots on your motherboard. ISA is the
2139 name of a bus system, i.e. the way the CPU talks to the other stuff
2140 inside your box. Other bus systems are PCI, EISA, MicroChannel
2141 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
2142 newer boards don't support it. If you have ISA, say Y, otherwise N.
2143
2144config EISA
2145 bool "EISA support"
2146 depends on ISA
2147 ---help---
2148 The Extended Industry Standard Architecture (EISA) bus was
2149 developed as an open alternative to the IBM MicroChannel bus.
2150
2151 The EISA bus provided some of the features of the IBM MicroChannel
2152 bus while maintaining backward compatibility with cards made for
2153 the older ISA bus. The EISA bus saw limited use between 1988 and
2154 1995 when it was made obsolete by the PCI bus.
2155
2156 Say Y here if you are building a kernel for an EISA-based machine.
2157
2158 Otherwise, say N.
2159
2160source "drivers/eisa/Kconfig"
2161
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002162config SCx200
2163 tristate "NatSemi SCx200 support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002164 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002165 This provides basic support for National Semiconductor's
2166 (now AMD's) Geode processors. The driver probes for the
2167 PCI-IDs of several on-chip devices, so its a good dependency
2168 for other scx200_* drivers.
2169
2170 If compiled as a module, the driver is named scx200.
2171
2172config SCx200HR_TIMER
2173 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
John Stultz592913e2010-07-13 17:56:20 -07002174 depends on SCx200
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002175 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002176 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002177 This driver provides a clocksource built upon the on-chip
2178 27MHz high-resolution timer. Its also a workaround for
2179 NSC Geode SC-1100's buggy TSC, which loses time when the
2180 processor goes idle (as is done by the scheduler). The
2181 other workaround is idle=poll boot option.
2182
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002183config OLPC
2184 bool "One Laptop Per Child support"
Thomas Gleixner54008972011-02-23 09:50:15 +01002185 depends on !X86_PAE
Andres Salomon3c554942009-12-14 18:00:36 -08002186 select GPIOLIB
Thomas Gleixnerdc3119e72011-02-23 10:08:31 +01002187 select OF
Daniel Drake45bb1672011-03-13 15:10:17 +00002188 select OF_PROMTREE
Grant Likelyb4e51852011-12-16 15:50:17 -07002189 select IRQ_DOMAIN
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002190 ---help---
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002191 Add support for detecting the unique features of the OLPC
2192 XO hardware.
2193
Daniel Drakea3128582011-06-25 17:34:10 +01002194config OLPC_XO1_PM
2195 bool "OLPC XO-1 Power Management"
Daniel Drake97c4cb72011-06-25 17:34:11 +01002196 depends on OLPC && MFD_CS5535 && PM_SLEEP
Daniel Drakea3128582011-06-25 17:34:10 +01002197 select MFD_CORE
Daniel Drakebf1ebf02010-10-10 10:40:32 +01002198 ---help---
Daniel Drake97c4cb72011-06-25 17:34:11 +01002199 Add support for poweroff and suspend of the OLPC XO-1 laptop.
Daniel Drakebf1ebf02010-10-10 10:40:32 +01002200
Daniel Drakecfee9592011-06-25 17:34:17 +01002201config OLPC_XO1_RTC
2202 bool "OLPC XO-1 Real Time Clock"
2203 depends on OLPC_XO1_PM && RTC_DRV_CMOS
2204 ---help---
2205 Add support for the XO-1 real time clock, which can be used as a
2206 programmable wakeup source.
2207
Daniel Drake7feda8e2011-06-25 17:34:12 +01002208config OLPC_XO1_SCI
2209 bool "OLPC XO-1 SCI extras"
Daniel Draked8d01a62011-07-24 18:33:21 +01002210 depends on OLPC && OLPC_XO1_PM
Randy Dunlaped8e47f2012-12-18 12:22:17 -08002211 depends on INPUT=y
Daniel Draked8d01a62011-07-24 18:33:21 +01002212 select POWER_SUPPLY
Daniel Drake7feda8e2011-06-25 17:34:12 +01002213 select GPIO_CS5535
2214 select MFD_CORE
2215 ---help---
2216 Add support for SCI-based features of the OLPC XO-1 laptop:
Daniel Drake7bc74b32011-06-25 17:34:14 +01002217 - EC-driven system wakeups
Daniel Drake7feda8e2011-06-25 17:34:12 +01002218 - Power button
Daniel Drake7bc74b32011-06-25 17:34:14 +01002219 - Ebook switch
Daniel Drake2cf2bae2011-06-25 17:34:15 +01002220 - Lid switch
Daniel Drakee1040ac2011-06-25 17:34:16 +01002221 - AC adapter status updates
2222 - Battery status updates
Daniel Drake7feda8e2011-06-25 17:34:12 +01002223
Daniel Drakea0f30f52011-06-25 17:34:18 +01002224config OLPC_XO15_SCI
2225 bool "OLPC XO-1.5 SCI extras"
Daniel Draked8d01a62011-07-24 18:33:21 +01002226 depends on OLPC && ACPI
2227 select POWER_SUPPLY
Daniel Drakea0f30f52011-06-25 17:34:18 +01002228 ---help---
2229 Add support for SCI-based features of the OLPC XO-1.5 laptop:
2230 - EC-driven system wakeups
2231 - AC adapter status updates
2232 - Battery status updates
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002233
Ed Wildgoosed4f3e352011-09-20 14:00:12 -07002234config ALIX
2235 bool "PCEngines ALIX System Support (LED setup)"
2236 select GPIOLIB
2237 ---help---
2238 This option enables system support for the PCEngines ALIX.
2239 At present this just sets up LEDs for GPIO control on
2240 ALIX2/3/6 boards. However, other system specific setup should
2241 get added here.
2242
2243 Note: You must still enable the drivers for GPIO and LED support
2244 (GPIO_CS5535 & LEDS_GPIO) to actually use the LEDs
2245
2246 Note: You have to set alix.force=1 for boards with Award BIOS.
2247
Philip Prindevilleda4e3302012-03-05 15:05:15 -08002248config NET5501
2249 bool "Soekris Engineering net5501 System Support (LEDS, GPIO, etc)"
2250 select GPIOLIB
2251 ---help---
2252 This option enables system support for the Soekris Engineering net5501.
2253
Philip A. Prindeville31970592012-01-14 01:45:39 -07002254config GEOS
2255 bool "Traverse Technologies GEOS System Support (LEDS, GPIO, etc)"
2256 select GPIOLIB
2257 depends on DMI
2258 ---help---
2259 This option enables system support for the Traverse Technologies GEOS.
2260
Vivien Didelot7d029122013-01-04 16:18:14 -05002261config TS5500
2262 bool "Technologic Systems TS-5500 platform support"
2263 depends on MELAN
2264 select CHECK_SIGNATURE
2265 select NEW_LEDS
2266 select LEDS_CLASS
2267 ---help---
2268 This option enables system support for the Technologic Systems TS-5500.
2269
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002270endif # X86_32
2271
Andreas Herrmann23ac4ae2010-09-17 18:03:43 +02002272config AMD_NB
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002273 def_bool y
Borislav Petkov0e152cd2010-03-12 15:43:03 +01002274 depends on CPU_SUP_AMD && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002275
2276source "drivers/pcmcia/Kconfig"
2277
2278source "drivers/pci/hotplug/Kconfig"
2279
Alexandre Bounine388b78a2011-03-23 16:43:03 -07002280config RAPIDIO
Alexandre Bouninefdf90ab2013-07-03 15:08:56 -07002281 tristate "RapidIO support"
Alexandre Bounine388b78a2011-03-23 16:43:03 -07002282 depends on PCI
2283 default n
2284 help
Alexandre Bouninefdf90ab2013-07-03 15:08:56 -07002285 If enabled this option will include drivers and the core
Alexandre Bounine388b78a2011-03-23 16:43:03 -07002286 infrastructure code to support RapidIO interconnect devices.
2287
2288source "drivers/rapidio/Kconfig"
2289
David Herrmanne3263ab2013-08-02 14:05:22 +02002290config X86_SYSFB
2291 bool "Mark VGA/VBE/EFI FB as generic system framebuffer"
2292 help
2293 Firmwares often provide initial graphics framebuffers so the BIOS,
2294 bootloader or kernel can show basic video-output during boot for
2295 user-guidance and debugging. Historically, x86 used the VESA BIOS
2296 Extensions and EFI-framebuffers for this, which are mostly limited
2297 to x86.
2298 This option, if enabled, marks VGA/VBE/EFI framebuffers as generic
2299 framebuffers so the new generic system-framebuffer drivers can be
2300 used on x86. If the framebuffer is not compatible with the generic
2301 modes, it is adverticed as fallback platform framebuffer so legacy
2302 drivers like efifb, vesafb and uvesafb can pick it up.
2303 If this option is not selected, all system framebuffers are always
2304 marked as fallback platform framebuffers as usual.
2305
2306 Note: Legacy fbdev drivers, including vesafb, efifb, uvesafb, will
2307 not be able to pick up generic system framebuffers if this option
2308 is selected. You are highly encouraged to enable simplefb as
2309 replacement if you select this option. simplefb can correctly deal
2310 with generic system framebuffers. But you should still keep vesafb
2311 and others enabled as fallback if a system framebuffer is
2312 incompatible with simplefb.
2313
2314 If unsure, say Y.
2315
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002316endmenu
2317
2318
2319menu "Executable file formats / Emulations"
2320
2321source "fs/Kconfig.binfmt"
2322
2323config IA32_EMULATION
2324 bool "IA32 Emulation"
2325 depends on X86_64
Randy Dunlapd1603992013-06-18 12:33:40 -07002326 select BINFMT_ELF
Roland McGratha97f52e2008-01-30 13:31:55 +01002327 select COMPAT_BINFMT_ELF
Catalin Marinasaf1839e2012-10-08 16:28:08 -07002328 select HAVE_UID16
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002329 ---help---
H. J. Lu5fd92e62012-02-19 10:40:03 -08002330 Include code to run legacy 32-bit programs under a
2331 64-bit kernel. You should likely turn this on, unless you're
2332 100% sure that you don't have any 32-bit programs left.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002333
2334config IA32_AOUT
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002335 tristate "IA32 a.out support"
2336 depends on IA32_EMULATION
2337 ---help---
2338 Support old a.out binaries in the 32bit emulation.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002339
H. Peter Anvin0bf62762012-02-27 14:09:10 -08002340config X86_X32
Kees Cook6ea30382012-10-02 11:16:47 -07002341 bool "x32 ABI for 64-bit mode"
2342 depends on X86_64 && IA32_EMULATION
H. J. Lu5fd92e62012-02-19 10:40:03 -08002343 ---help---
2344 Include code to run binaries for the x32 native 32-bit ABI
2345 for 64-bit processors. An x32 process gets access to the
2346 full 64-bit register file and wide data path while leaving
2347 pointers at 32 bits for smaller memory footprint.
2348
2349 You will need a recent binutils (2.22 or later) with
2350 elf32_x86_64 support enabled to compile a kernel with this
2351 option set.
2352
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002353config COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002354 def_bool y
H. Peter Anvin0bf62762012-02-27 14:09:10 -08002355 depends on IA32_EMULATION || X86_X32
Chris Metcalf48b25c42012-03-15 13:13:38 -04002356 select ARCH_WANT_OLD_COMPAT_IPC
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002357
Jan Beulich3120e252012-09-10 12:41:45 +01002358if COMPAT
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002359config COMPAT_FOR_U64_ALIGNMENT
Jan Beulich3120e252012-09-10 12:41:45 +01002360 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002361
2362config SYSVIPC_COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002363 def_bool y
Jan Beulich3120e252012-09-10 12:41:45 +01002364 depends on SYSVIPC
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002365
David Howellsee009e4a02011-03-07 15:06:20 +00002366config KEYS_COMPAT
Jan Beulich3120e252012-09-10 12:41:45 +01002367 def_bool y
2368 depends on KEYS
2369endif
David Howellsee009e4a02011-03-07 15:06:20 +00002370
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002371endmenu
2372
2373
Keith Packarde5beae12008-11-03 18:21:45 +01002374config HAVE_ATOMIC_IOMAP
2375 def_bool y
2376 depends on X86_32
2377
Alessandro Rubini4692d772012-04-04 19:39:58 +02002378config X86_DEV_DMA_OPS
2379 bool
Alessandro Rubini83125a32012-04-04 19:40:21 +02002380 depends on X86_64 || STA2X11
Alessandro Rubini4692d772012-04-04 19:39:58 +02002381
Alessandro Rubinif7219a52012-04-04 19:40:10 +02002382config X86_DMA_REMAP
2383 bool
Alessandro Rubini83125a32012-04-04 19:40:21 +02002384 depends on STA2X11
Alessandro Rubinif7219a52012-04-04 19:40:10 +02002385
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002386source "net/Kconfig"
2387
2388source "drivers/Kconfig"
2389
2390source "drivers/firmware/Kconfig"
2391
2392source "fs/Kconfig"
2393
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002394source "arch/x86/Kconfig.debug"
2395
2396source "security/Kconfig"
2397
2398source "crypto/Kconfig"
2399
Avi Kivityedf88412007-12-16 11:02:48 +02002400source "arch/x86/kvm/Kconfig"
2401
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002402source "lib/Kconfig"