blob: 5553f9f1a70d1ee85e59135c1f7a16534a494a33 [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"
4 default ARCH = "x86_64"
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
10 def_bool !64BIT
Russell King82491452011-05-08 18:55:19 +010011 select CLKSRC_I8253
Sam Ravnborgdaa93fa2007-11-12 20:54:30 +010012
13config X86_64
14 def_bool 64BIT
Sam Ravnborg1032c0b2007-11-06 21:35:08 +010015
16### Arch settings
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010017config X86
Harvey Harrison3c2362e2008-01-30 13:31:03 +010018 def_bool y
David Woodhousee17c6d52008-06-17 12:19:34 +010019 select HAVE_AOUT if X86_32
Ingo Molnara5574cf2008-05-05 23:19:50 +020020 select HAVE_UNSTABLE_SCHED_CLOCK
Sam Ravnborgec7748b2008-02-09 10:46:40 +010021 select HAVE_IDE
Mathieu Desnoyers42d4b832008-02-02 15:10:34 -050022 select HAVE_OPROFILE
Ralf Baechle8761f1a2011-06-01 19:05:09 +010023 select HAVE_PCSPKR_PLATFORM
Peter Zijlstracc2067a2010-11-16 21:49:01 +010024 select HAVE_PERF_EVENTS
Peter Zijlstrae360adb2010-10-14 14:01:34 +080025 select HAVE_IRQ_WORK
Rik van Riel28b2ee22008-07-23 21:27:05 -070026 select HAVE_IOREMAP_PROT
Mathieu Desnoyers3f550092008-02-02 15:10:35 -050027 select HAVE_KPROBES
Yinghai Lu72d7c3b2010-08-25 13:39:17 -070028 select HAVE_MEMBLOCK
Ingo Molnar1f972762008-07-26 13:52:50 +020029 select ARCH_WANT_OPTIONAL_GPIOLIB
Ingo Molnarda4276b2009-01-07 11:05:10 +010030 select ARCH_WANT_FRAME_POINTERS
FUJITA Tomonori7c095e42009-06-17 16:28:12 -070031 select HAVE_DMA_ATTRS
Ananth N Mavinakayanahalli9edddaa2008-03-04 14:28:37 -080032 select HAVE_KRETPROBES
Masami Hiramatsuc0f7ac32010-02-25 08:34:46 -050033 select HAVE_OPTPROBES
Steven Rostedte4b2b882008-08-14 15:45:11 -040034 select HAVE_FTRACE_MCOUNT_RECORD
Steven Rostedtcf4db252010-10-14 23:32:44 -040035 select HAVE_C_RECORDMCOUNT
Steven Rostedt677aa9f2008-05-17 00:01:36 -040036 select HAVE_DYNAMIC_FTRACE
Steven Rostedt606576c2008-10-06 19:06:12 -040037 select HAVE_FUNCTION_TRACER
Frederic Weisbecker48d68b22008-12-02 00:20:39 +010038 select HAVE_FUNCTION_GRAPH_TRACER
Steven Rostedt71e308a2009-06-18 12:45:08 -040039 select HAVE_FUNCTION_GRAPH_FP_TEST
Steven Rostedt60a7ecf2008-11-05 16:05:44 -050040 select HAVE_FUNCTION_TRACE_MCOUNT_TEST
Steven Rostedt9a5fd902009-02-06 01:14:26 -050041 select HAVE_FTRACE_NMI_ENTER if DYNAMIC_FTRACE
Josh Stone66700002009-08-24 14:43:11 -070042 select HAVE_SYSCALL_TRACEPOINTS
Ingo Molnare0ec9482009-01-27 17:01:14 +010043 select HAVE_KVM
Ingo Molnar49793b02009-01-27 17:02:29 +010044 select HAVE_ARCH_KGDB
Roland McGrath99bbc4b2008-04-20 14:35:12 -070045 select HAVE_ARCH_TRACEHOOK
Dmitry Baryshkov323ec002008-06-29 14:19:31 +040046 select HAVE_GENERIC_DMA_COHERENT if X86_32
Johannes Berg58340a02008-07-25 01:45:33 -070047 select HAVE_EFFICIENT_UNALIGNED_ACCESS
Török Edwin8d264872008-11-23 12:39:08 +020048 select USER_STACKTRACE_SUPPORT
Heiko Carstensf850c302010-02-10 17:25:17 +010049 select HAVE_REGS_AND_STACK_ACCESS_API
Joerg Roedel2118d0c2009-01-09 15:13:15 +010050 select HAVE_DMA_API_DEBUG
H. Peter Anvin2e9f3bd2009-01-04 15:41:25 -080051 select HAVE_KERNEL_GZIP
52 select HAVE_KERNEL_BZIP2
53 select HAVE_KERNEL_LZMA
Lasse Collin30314802011-01-12 17:01:24 -080054 select HAVE_KERNEL_XZ
Albin Tonnerre13510992010-01-08 14:42:45 -080055 select HAVE_KERNEL_LZO
K.Prasad0067f122009-06-01 23:43:57 +053056 select HAVE_HW_BREAKPOINT
Frederic Weisbecker01027522010-04-11 18:55:56 +020057 select HAVE_MIXED_BREAKPOINTS_REGS
Frederic Weisbecker99e8c5a2009-12-17 01:33:54 +010058 select PERF_EVENTS
Frederic Weisbeckerc01d4322010-05-15 22:57:48 +020059 select HAVE_PERF_EVENTS_NMI
Frederic Weisbecker99e8c5a2009-12-17 01:33:54 +010060 select ANON_INODES
Pekka Enberg0a4af3b2009-02-26 21:38:56 +020061 select HAVE_ARCH_KMEMCHECK
Avi Kivity7c68af62009-09-19 09:40:22 +030062 select HAVE_USER_RETURN_NOTIFIER
Steven Rostedt46eb3b62010-09-22 23:10:23 -040063 select HAVE_ARCH_JUMP_LABEL
Masami Hiramatsu3cba11d2010-10-14 12:10:42 +090064 select HAVE_TEXT_POKE_SMP
Thomas Gleixner3bb98082010-09-27 12:46:02 +000065 select HAVE_GENERIC_HARDIRQS
66 select HAVE_SPARSE_IRQ
Yinghai Lu141d55e2011-10-12 11:53:17 -070067 select SPARSE_IRQ
Jan Beulichc49aa5b2011-03-08 09:24:26 +000068 select GENERIC_FIND_FIRST_BIT
Thomas Gleixner3bb98082010-09-27 12:46:02 +000069 select GENERIC_IRQ_PROBE
70 select GENERIC_PENDING_IRQ if SMP
Thomas Gleixner517e4982010-12-16 17:59:57 +010071 select GENERIC_IRQ_SHOW
Martin Schwidefskyd1748302011-08-23 15:29:42 +020072 select GENERIC_CLOCKEVENTS_MIN_ADJUST
Thomas Gleixnerc01858082011-02-07 02:24:08 +010073 select IRQ_FORCED_THREADING
Amerigo Wang351f8f82011-01-12 16:59:39 -080074 select USE_GENERIC_SMP_HELPERS if SMP
Randy Dunlap9cddf152011-05-04 11:06:05 -070075 select HAVE_BPF_JIT if (X86_64 && NET)
Thomas Gleixner0a779c52011-06-09 13:08:26 +000076 select CLKEVT_I8253
Huang Yingdf013ff2011-07-13 13:14:22 +080077 select ARCH_HAVE_NMI_SAFE_CMPXCHG
Balbir Singh7d8330a2008-02-10 12:46:28 +053078
Ingo Molnarba7e4d12009-06-06 13:58:12 +020079config INSTRUCTION_DECODER
80 def_bool (KPROBES || PERF_EVENTS)
81
Linus Torvalds51b26ad2009-04-26 10:12:47 -070082config OUTPUT_FORMAT
83 string
84 default "elf32-i386" if X86_32
85 default "elf64-x86-64" if X86_64
86
Sam Ravnborg73531902008-05-25 23:03:18 +020087config ARCH_DEFCONFIG
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +020088 string
Sam Ravnborg73531902008-05-25 23:03:18 +020089 default "arch/x86/configs/i386_defconfig" if X86_32
90 default "arch/x86/configs/x86_64_defconfig" if X86_64
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +020091
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010092config GENERIC_CMOS_UPDATE
Harvey Harrison3c2362e2008-01-30 13:31:03 +010093 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010094
95config CLOCKSOURCE_WATCHDOG
Harvey Harrison3c2362e2008-01-30 13:31:03 +010096 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010097
98config GENERIC_CLOCKEVENTS
Harvey Harrison3c2362e2008-01-30 13:31:03 +010099 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100100
H. Peter Anvinae7bd112011-07-21 13:34:05 -0700101config ARCH_CLOCKSOURCE_DATA
102 def_bool y
103 depends on X86_64
104
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100105config GENERIC_CLOCKEVENTS_BROADCAST
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100106 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100107 depends on X86_64 || (X86_32 && X86_LOCAL_APIC)
108
109config LOCKDEP_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100110 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100111
112config STACKTRACE_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100113 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100114
Heiko Carstensaa7d9352008-02-01 17:45:14 +0100115config HAVE_LATENCYTOP_SUPPORT
116 def_bool y
117
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100118config MMU
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100119 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100120
121config ZONE_DMA
David Rientjesdc382fd2011-05-16 13:54:10 -0700122 bool "DMA memory allocation support" if EXPERT
123 default y
124 help
125 DMA memory allocation support allows devices with less than 32-bit
126 addressing to allocate within the first 16MB of address space.
127 Disable if no such devices will be used.
128
129 If unsure, say Y.
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100130
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100131config SBUS
132 bool
133
FUJITA Tomonori3bc4e452010-03-10 15:23:22 -0800134config NEED_DMA_MAP_STATE
Suresh Siddhad3f13812011-08-23 17:05:25 -0700135 def_bool (X86_64 || INTEL_IOMMU || DMA_API_DEBUG)
FUJITA Tomonori3bc4e452010-03-10 15:23:22 -0800136
FUJITA Tomonori18e98302010-05-26 14:44:32 -0700137config NEED_SG_DMA_LENGTH
Andrew Morton4a14d842010-05-26 14:44:33 -0700138 def_bool y
FUJITA Tomonori18e98302010-05-26 14:44:32 -0700139
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100140config GENERIC_ISA_DMA
David Rientjes1c00f012011-03-22 16:34:59 -0700141 def_bool ISA_DMA_API
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100142
143config GENERIC_IOMAP
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100144 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100145
146config GENERIC_BUG
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100147 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100148 depends on BUG
Jan Beulichb93a5312008-12-16 11:40:27 +0000149 select GENERIC_BUG_RELATIVE_POINTERS if X86_64
150
151config GENERIC_BUG_RELATIVE_POINTERS
152 bool
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100153
154config GENERIC_HWEIGHT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100155 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100156
Florian Fainellia6082952008-01-30 13:33:35 +0100157config GENERIC_GPIO
Jan Beulich9ba16082008-10-15 22:01:38 -0700158 bool
Florian Fainellia6082952008-01-30 13:33:35 +0100159
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100160config ARCH_MAY_HAVE_PC_FDC
David Rientjes8df3bd92011-03-22 16:34:58 -0700161 def_bool ISA_DMA_API
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100162
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100163config RWSEM_GENERIC_SPINLOCK
164 def_bool !X86_XADD
165
166config RWSEM_XCHGADD_ALGORITHM
167 def_bool X86_XADD
168
Venki Pallipadia6869cc2008-02-08 17:05:44 -0800169config ARCH_HAS_CPU_IDLE_WAIT
170 def_bool y
171
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100172config GENERIC_CALIBRATE_DELAY
173 def_bool y
174
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100175config GENERIC_TIME_VSYSCALL
176 bool
177 default X86_64
178
venkatesh.pallipadi@intel.com9a0b8412008-01-31 17:35:06 -0800179config ARCH_HAS_CPU_RELAX
180 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100181
Venkatesh Pallipadi89cedfe2008-10-16 19:00:08 -0400182config ARCH_HAS_DEFAULT_IDLE
183 def_bool y
184
Pekka Enberg1b27d052008-04-28 02:12:22 -0700185config ARCH_HAS_CACHE_LINE_SIZE
186 def_bool y
187
Mike Travisdd5af902008-01-30 13:33:32 +0100188config HAVE_SETUP_PER_CPU_AREA
Brian Gerst89c9c4c2009-01-27 12:56:48 +0900189 def_bool y
travis@sgi.comb32ef632008-01-30 13:32:51 +0100190
Tejun Heo08fc4582009-08-14 15:00:49 +0900191config NEED_PER_CPU_EMBED_FIRST_CHUNK
192 def_bool y
193
194config NEED_PER_CPU_PAGE_FIRST_CHUNK
Tejun Heo11124412009-02-20 16:29:09 +0900195 def_bool y
196
Johannes Berg801e4062007-12-08 02:12:39 +0100197config ARCH_HIBERNATION_POSSIBLE
198 def_bool y
Johannes Berg801e4062007-12-08 02:12:39 +0100199
Johannes Bergf4cb5702007-12-08 02:14:00 +0100200config ARCH_SUSPEND_POSSIBLE
201 def_bool y
Johannes Bergf4cb5702007-12-08 02:14:00 +0100202
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100203config ZONE_DMA32
204 bool
205 default X86_64
206
207config ARCH_POPULATES_NODE_MAP
208 def_bool y
209
210config AUDIT_ARCH
211 bool
212 default X86_64
213
Ingo Molnar765c68b2008-04-09 11:03:37 +0200214config ARCH_SUPPORTS_OPTIMIZED_INLINING
215 def_bool y
216
Akinobu Mita6a11f752009-03-31 15:23:17 -0700217config ARCH_SUPPORTS_DEBUG_PAGEALLOC
218 def_bool y
219
Shane Wang69575d32009-09-01 18:25:07 -0700220config HAVE_INTEL_TXT
221 def_bool y
Suresh Siddhad3f13812011-08-23 17:05:25 -0700222 depends on EXPERIMENTAL && INTEL_IOMMU && ACPI
Shane Wang69575d32009-09-01 18:25:07 -0700223
Sam Ravnborg6b0c3d42008-01-30 13:32:27 +0100224config X86_32_SMP
225 def_bool y
226 depends on X86_32 && SMP
227
228config X86_64_SMP
229 def_bool y
230 depends on X86_64 && SMP
231
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100232config X86_HT
Jan Beulich6fc108a2010-04-21 15:23:44 +0100233 def_bool y
Adrian Bunkee0011a2007-12-04 17:19:07 +0100234 depends on SMP
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100235
Tejun Heoccbeed32009-02-09 22:17:40 +0900236config X86_32_LAZY_GS
237 def_bool y
Tejun Heo60a53172009-02-09 22:17:40 +0900238 depends on X86_32 && !CC_STACKPROTECTOR
Tejun Heoccbeed32009-02-09 22:17:40 +0900239
Borislav Petkovd61931d2010-03-05 17:34:46 +0100240config ARCH_HWEIGHT_CFLAGS
241 string
242 default "-fcall-saved-ecx -fcall-saved-edx" if X86_32
243 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
244
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100245config KTIME_SCALAR
246 def_bool X86_32
Borislav Petkovd7c53c92010-08-19 20:10:29 +0200247
248config ARCH_CPU_PROBE_RELEASE
249 def_bool y
250 depends on HOTPLUG_CPU
251
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100252source "init/Kconfig"
Matt Helsleydc52ddc2008-10-18 20:27:21 -0700253source "kernel/Kconfig.freezer"
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100254
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100255menu "Processor type and features"
256
257source "kernel/time/Kconfig"
258
259config SMP
260 bool "Symmetric multi-processing support"
261 ---help---
262 This enables support for systems with more than one CPU. If you have
263 a system with only one CPU, like most personal computers, say N. If
264 you have a system with more than one CPU, say Y.
265
266 If you say N here, the kernel will run on single and multiprocessor
267 machines, but will use only one CPU of a multiprocessor machine. If
268 you say Y here, the kernel will run on many, but not all,
269 singleprocessor machines. On a singleprocessor machine, the kernel
270 will run faster if you say N here.
271
272 Note that if you say Y here and choose architecture "586" or
273 "Pentium" under "Processor family", the kernel will not work on 486
274 architectures. Similarly, multiprocessor kernels for the "PPro"
275 architecture may not work on all Pentium based boards.
276
277 People using multiprocessor machines who say Y here should also say
278 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
279 Management" code will be disabled if you say Y here.
280
Paul Bolle395cf962011-08-15 02:02:26 +0200281 See also <file:Documentation/x86/i386/IO-APIC.txt>,
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100282 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
283 <http://www.tldp.org/docs.html#howto>.
284
285 If you don't know what to do here, say N.
286
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800287config X86_X2APIC
288 bool "Support x2apic"
Suresh Siddhad3f13812011-08-23 17:05:25 -0700289 depends on X86_LOCAL_APIC && X86_64 && IRQ_REMAP
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800290 ---help---
291 This enables x2apic support on CPUs that have this feature.
292
293 This allows 32-bit apic IDs (so it can support very large systems),
294 and accesses the local apic via MSRs not via mmio.
295
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800296 If you don't know what to do here, say N.
297
Yinghai Lu6695c852008-06-19 12:13:09 -0700298config X86_MPPARSE
Jan Beulich7a527682008-10-30 10:38:24 +0000299 bool "Enable MPS table" if ACPI
300 default y
Ingo Molnar5ab74722008-07-10 14:42:03 +0200301 depends on X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100302 ---help---
Yinghai Lu6695c852008-06-19 12:13:09 -0700303 For old smp systems that do not have proper acpi support. Newer systems
304 (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
Yinghai Lu6695c852008-06-19 12:13:09 -0700305
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800306config X86_BIGSMP
307 bool "Support for big SMP systems with more than 8 CPUs"
308 depends on X86_32 && SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100309 ---help---
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800310 This option is needed for the systems that have more than 8 CPUs
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100311
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800312if X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800313config X86_EXTENDED_PLATFORM
314 bool "Support for extended (non-PC) x86 platforms"
315 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100316 ---help---
Ingo Molnar06ac8342009-01-27 18:11:43 +0100317 If you disable this option then the kernel will only support
318 standard PC platforms. (which covers the vast majority of
319 systems out there.)
320
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800321 If you enable this option then you'll be able to select support
322 for the following (non-PC) 32 bit x86 platforms:
323 AMD Elan
324 NUMAQ (IBM/Sequent)
325 RDC R-321x SoC
326 SGI 320/540 (Visual Workstation)
327 Summit/EXA (IBM x440)
328 Unisys ES7000 IA32 series
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200329 Moorestown MID devices
Ingo Molnar06ac8342009-01-27 18:11:43 +0100330
331 If you have one of these systems, or if you want to build a
332 generic distribution kernel, say Y here - otherwise say N.
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800333endif
Ingo Molnar06ac8342009-01-27 18:11:43 +0100334
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800335if X86_64
336config X86_EXTENDED_PLATFORM
337 bool "Support for extended (non-PC) x86 platforms"
338 default y
339 ---help---
340 If you disable this option then the kernel will only support
341 standard PC platforms. (which covers the vast majority of
342 systems out there.)
343
344 If you enable this option then you'll be able to select support
345 for the following (non-PC) 64 bit x86 platforms:
346 ScaleMP vSMP
347 SGI Ultraviolet
348
349 If you have one of these systems, or if you want to build a
350 generic distribution kernel, say Y here - otherwise say N.
351endif
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800352# This is an alphabetically sorted list of 64 bit extended platforms
353# Please maintain the alphabetic order if and when there are additions
Nick Piggin03b48632009-01-20 04:36:04 +0100354
Ingo Molnar6a485652009-01-27 18:29:13 +0100355config X86_VSMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800356 bool "ScaleMP vSMP"
Randy Dunlap03f1a172010-10-13 21:00:23 -0700357 select PARAVIRT_GUEST
Ingo Molnar6a485652009-01-27 18:29:13 +0100358 select PARAVIRT
359 depends on X86_64 && PCI
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800360 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100361 ---help---
Ingo Molnar6a485652009-01-27 18:29:13 +0100362 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
363 supposed to run on these EM64T-based machines. Only choose this option
364 if you have one of these machines.
365
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800366config X86_UV
367 bool "SGI Ultraviolet"
368 depends on X86_64
369 depends on X86_EXTENDED_PLATFORM
Jack Steiner54c28d22009-04-03 15:39:42 -0500370 depends on NUMA
Suresh Siddha9d6c26e2009-04-20 13:02:31 -0700371 depends on X86_X2APIC
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800372 ---help---
373 This option is needed in order to support SGI Ultraviolet systems.
374 If you don't have one of these, you should say N here.
375
376# Following is an alphabetically sorted list of 32 bit extended platforms
377# Please maintain the alphabetic order if and when there are additions
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100378
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800379config X86_INTEL_CE
380 bool "CE4100 TV platform"
381 depends on PCI
382 depends on PCI_GODIRECT
383 depends on X86_32
384 depends on X86_EXTENDED_PLATFORM
Dirk Brandewie37bc9f52010-11-09 12:08:08 -0800385 select X86_REBOOTFIXUPS
Sebastian Andrzej Siewiorda6b7372011-02-22 21:07:37 +0100386 select OF
387 select OF_EARLY_FLATTREE
Thomas Gleixnerc751e172010-11-09 12:08:04 -0800388 ---help---
389 Select for the Intel CE media processor (CE4100) SOC.
390 This option compiles in support for the CE4100 SOC for settop
391 boxes and media devices.
392
Alan Coxdd137522011-12-05 23:14:39 +0000393config X86_WANT_INTEL_MID
Alan Cox43605ef2011-07-12 17:49:29 +0100394 bool "Intel MID platform support"
395 depends on X86_32
396 depends on X86_EXTENDED_PLATFORM
397 ---help---
398 Select to build a kernel capable of supporting Intel MID platform
399 systems which do not have the PCI legacy interfaces (Moorestown,
400 Medfield). If you are building for a PC class system say N here.
401
Alan Coxdd137522011-12-05 23:14:39 +0000402if X86_WANT_INTEL_MID
Alan Cox43605ef2011-07-12 17:49:29 +0100403
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200404config X86_MRST
405 bool "Moorestown MID platform"
Jacob Pan4b2f3f72010-02-25 10:02:14 -0800406 depends on PCI
407 depends on PCI_GOANY
Jacob Pan4b2f3f72010-02-25 10:02:14 -0800408 depends on X86_IO_APIC
Jacob Panbb24c472009-09-02 07:37:17 -0700409 select APB_TIMER
Feng Tang1da4b1c2010-11-09 11:22:58 +0000410 select I2C
411 select SPI
Alan Coxb9fc71f2010-11-15 17:31:19 +0000412 select INTEL_SCU_IPC
Randy Dunlapad025192010-11-15 10:14:06 -0800413 select X86_PLATFORM_DEVICES
Alan Coxdd137522011-12-05 23:14:39 +0000414 select X86_INTEL_MID
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200415 ---help---
416 Moorestown is Intel's Low Power Intel Architecture (LPIA) based Moblin
417 Internet Device(MID) platform. Moorestown consists of two chips:
418 Lincroft (CPU core, graphics, and memory controller) and Langwell IOH.
419 Unlike standard x86 PCs, Moorestown does not have many legacy devices
420 nor standard legacy replacement devices/features. e.g. Moorestown does
421 not contain i8259, i8254, HPET, legacy BIOS, most of the io ports.
422
Alan Cox43605ef2011-07-12 17:49:29 +0100423endif
424
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800425config X86_RDC321X
426 bool "RDC R-321x SoC"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100427 depends on X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800428 depends on X86_EXTENDED_PLATFORM
429 select M486
430 select X86_REBOOTFIXUPS
431 ---help---
432 This option is needed for RDC R-321x system-on-chip, also known
433 as R-8610-(G).
434 If you don't have one of these chips, you should say N here.
435
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100436config X86_32_NON_STANDARD
Ingo Molnar9c398012009-01-27 18:24:57 +0100437 bool "Support non-standard 32-bit SMP architectures"
438 depends on X86_32 && SMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800439 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100440 ---help---
441 This option compiles in the NUMAQ, Summit, bigsmp, ES7000, default
Yinghai Lud49c4282008-06-08 18:31:54 -0700442 subarchitectures. It is intended for a generic binary kernel.
443 if you select them all, kernel will probe it one by one. and will
444 fallback to default.
445
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800446# Alphabetically sorted list of Non standard 32 bit platforms
Yinghai Lud49c4282008-06-08 18:31:54 -0700447
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100448config X86_NUMAQ
449 bool "NUMAQ (IBM/Sequent)"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100450 depends on X86_32_NON_STANDARD
Pan, Jacob juna92d1522010-02-24 16:59:55 -0800451 depends on PCI
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100452 select NUMA
Ingo Molnar9c398012009-01-27 18:24:57 +0100453 select X86_MPPARSE
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100454 ---help---
Yinghai Lud49c4282008-06-08 18:31:54 -0700455 This option is used for getting Linux to run on a NUMAQ (IBM/Sequent)
456 NUMA multiquad box. This changes the way that processors are
457 bootstrapped, and uses Clustered Logical APIC addressing mode instead
458 of Flat Logical. You will need a new lynxer.elf file to flash your
459 firmware with - send email to <Martin.Bligh@us.ibm.com>.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100460
Linus Torvaldsd949f362009-09-26 09:35:07 -0700461config X86_SUPPORTS_MEMORY_FAILURE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100462 def_bool y
Linus Torvaldsd949f362009-09-26 09:35:07 -0700463 # MCE code calls memory_failure():
464 depends on X86_MCE
465 # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
466 depends on !X86_NUMAQ
467 # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
468 depends on X86_64 || !SPARSEMEM
469 select ARCH_SUPPORTS_MEMORY_FAILURE
Linus Torvaldsd949f362009-09-26 09:35:07 -0700470
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200471config X86_VISWS
472 bool "SGI 320/540 (Visual Workstation)"
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800473 depends on X86_32 && PCI && X86_MPPARSE && PCI_GODIRECT
474 depends on X86_32_NON_STANDARD
475 ---help---
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200476 The SGI Visual Workstation series is an IA32-based workstation
477 based on SGI systems chips with some legacy PC hardware attached.
478
479 Say Y here to create a kernel to run on the SGI 320 or 540.
480
481 A kernel compiled for the Visual Workstation will run on general
482 PCs as well. See <file:Documentation/sgi-visws.txt> for details.
483
Ingo Molnar9c398012009-01-27 18:24:57 +0100484config X86_SUMMIT
485 bool "Summit/EXA (IBM x440)"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100486 depends on X86_32_NON_STANDARD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100487 ---help---
Ingo Molnar9c398012009-01-27 18:24:57 +0100488 This option is needed for IBM systems that use the Summit/EXA chipset.
489 In particular, it is needed for the x440.
Ingo Molnar1f972762008-07-26 13:52:50 +0200490
Ingo Molnar9c398012009-01-27 18:24:57 +0100491config X86_ES7000
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800492 bool "Unisys ES7000 IA32 series"
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800493 depends on X86_32_NON_STANDARD && X86_BIGSMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100494 ---help---
Ingo Molnar9c398012009-01-27 18:24:57 +0100495 Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
496 supposed to run on an IA32-based Unisys ES7000 system.
497
Shérab82148d12010-09-25 06:06:57 +0200498config X86_32_IRIS
499 tristate "Eurobraille/Iris poweroff module"
500 depends on X86_32
501 ---help---
502 The Iris machines from EuroBraille do not have APM or ACPI support
503 to shut themselves down properly. A special I/O sequence is
504 needed to do so, which is what this module does at
505 kernel shutdown.
506
507 This is only for Iris machines from EuroBraille.
508
509 If unused, say N.
510
Ingo Molnarae1e9132008-11-11 09:05:16 +0100511config SCHED_OMIT_FRAME_POINTER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100512 def_bool y
513 prompt "Single-depth WCHAN output"
Ken Chena87d0912008-11-06 11:10:49 -0800514 depends on X86
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100515 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100516 Calculate simpler /proc/<PID>/wchan values. If this option
517 is disabled then wchan values will recurse back to the
518 caller function. This provides more accurate wchan values,
519 at the expense of slightly more scheduling overhead.
520
521 If in doubt, say "Y".
522
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100523menuconfig PARAVIRT_GUEST
524 bool "Paravirtualized guest support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100525 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100526 Say Y here to get to see options related to running Linux under
527 various hypervisors. This option alone does not add any kernel code.
528
529 If you say N, all options in this submenu will be skipped and disabled.
530
531if PARAVIRT_GUEST
532
Glauber Costa095c0aa2011-07-11 15:28:18 -0400533config PARAVIRT_TIME_ACCOUNTING
534 bool "Paravirtual steal time accounting"
535 select PARAVIRT
536 default n
537 ---help---
538 Select this option to enable fine granularity task steal time
539 accounting. Time spent executing other tasks in parallel with
540 the current vCPU is discounted from the vCPU power. To account for
541 that, there can be a small performance impact.
542
543 If in doubt, say N here.
544
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100545source "arch/x86/xen/Kconfig"
546
Glauber de Oliveira Costa790c73f2008-02-15 17:52:48 -0200547config KVM_CLOCK
548 bool "KVM paravirtualized clock"
549 select PARAVIRT
Gerd Hoffmannf6e16d52008-06-03 16:17:32 +0200550 select PARAVIRT_CLOCK
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100551 ---help---
Glauber de Oliveira Costa790c73f2008-02-15 17:52:48 -0200552 Turning on this option will allow you to run a paravirtualized clock
553 when running over the KVM hypervisor. Instead of relying on a PIT
554 (or probably other) emulation by the underlying device model, the host
555 provides the guest with timing infrastructure such as time of day, and
556 system time
557
Marcelo Tosatti0cf1bfd2008-02-22 12:21:36 -0500558config KVM_GUEST
559 bool "KVM Guest support"
560 select PARAVIRT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100561 ---help---
562 This option enables various optimizations for running under the KVM
563 hypervisor.
Marcelo Tosatti0cf1bfd2008-02-22 12:21:36 -0500564
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100565source "arch/x86/lguest/Kconfig"
566
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100567config PARAVIRT
568 bool "Enable paravirtualization code"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100569 ---help---
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100570 This changes the kernel so it can modify itself when it is run
571 under a hypervisor, potentially improving performance significantly
572 over full virtualization. However, when run without a hypervisor
573 the kernel is theoretically slower and slightly larger.
574
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700575config PARAVIRT_SPINLOCKS
576 bool "Paravirtualization layer for spinlocks"
577 depends on PARAVIRT && SMP && EXPERIMENTAL
578 ---help---
579 Paravirtualized spinlocks allow a pvops backend to replace the
580 spinlock implementation with something virtualization-friendly
581 (for example, block the virtual CPU rather than spinning).
582
583 Unfortunately the downside is an up to 5% performance hit on
584 native kernels, with various workloads.
585
586 If you are unsure how to answer this question, answer N.
587
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200588config PARAVIRT_CLOCK
589 bool
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200590
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100591endif
592
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400593config PARAVIRT_DEBUG
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100594 bool "paravirt-ops debugging"
595 depends on PARAVIRT && DEBUG_KERNEL
596 ---help---
597 Enable to debug paravirt_ops internals. Specifically, BUG if
598 a paravirt_op is missing when it is called.
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400599
Yinghai Lu08677212010-02-10 01:20:20 -0800600config NO_BOOTMEM
Yinghai Lu774ea0b2010-08-25 13:39:18 -0700601 def_bool y
Yinghai Lu08677212010-02-10 01:20:20 -0800602
Yinghai Lu03273182008-04-18 17:49:15 -0700603config MEMTEST
604 bool "Memtest"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100605 ---help---
Yinghai Luc64df702008-03-21 18:56:19 -0700606 This option adds a kernel parameter 'memtest', which allows memtest
Yinghai Lu03273182008-04-18 17:49:15 -0700607 to be set.
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100608 memtest=0, mean disabled; -- default
609 memtest=1, mean do 1 test pattern;
610 ...
611 memtest=4, mean do 4 test patterns.
Thomas Gleixneraba37282008-07-15 14:48:48 +0200612 If you are unsure how to answer this question, answer N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100613
614config X86_SUMMIT_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100615 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100616 depends on X86_32 && NUMA && X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100617
618config X86_CYCLONE_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100619 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100620 depends on X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100621
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100622source "arch/x86/Kconfig.cpu"
623
624config HPET_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100625 def_bool X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100626 prompt "HPET Timer Support" if X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100627 ---help---
628 Use the IA-PC HPET (High Precision Event Timer) to manage
629 time in preference to the PIT and RTC, if a HPET is
630 present.
631 HPET is the next generation timer replacing legacy 8254s.
632 The HPET provides a stable time base on SMP
633 systems, unlike the TSC, but it is more expensive to access,
634 as it is off-chip. You can find the HPET spec at
635 <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100636
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100637 You can safely choose Y here. However, HPET will only be
638 activated if the platform and the BIOS support this feature.
639 Otherwise the 8254 will be used for timing services.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100640
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100641 Choose N to continue using the legacy 8254 timer.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100642
643config HPET_EMULATE_RTC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100644 def_bool y
Bernhard Walle9d8af782008-02-06 01:38:52 -0800645 depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100646
Jacob Panbb24c472009-09-02 07:37:17 -0700647config APB_TIMER
648 def_bool y if MRST
649 prompt "Langwell APB Timer Support" if X86_MRST
Jamie Iles06c3df42011-06-06 12:43:07 +0100650 select DW_APB_TIMER
Jacob Panbb24c472009-09-02 07:37:17 -0700651 help
652 APB timer is the replacement for 8254, HPET on X86 MID platforms.
653 The APBT provides a stable time base on SMP
654 systems, unlike the TSC, but it is more expensive to access,
655 as it is off-chip. APB timers are always running regardless of CPU
656 C states, they are used as per CPU clockevent device when possible.
657
David Rientjes6a108a12011-01-20 14:44:16 -0800658# Mark as expert because too many people got it wrong.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100659# The code disables itself when not needed.
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700660config DMI
661 default y
David Rientjes6a108a12011-01-20 14:44:16 -0800662 bool "Enable DMI scanning" if EXPERT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100663 ---help---
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700664 Enabled scanning of DMI to identify machine quirks. Say Y
665 here unless you have verified that your setup is not
666 affected by entries in the DMI blacklist. Required by PNP
667 BIOS code.
668
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100669config GART_IOMMU
David Rientjes6a108a12011-01-20 14:44:16 -0800670 bool "GART IOMMU support" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100671 default y
672 select SWIOTLB
Andreas Herrmann23ac4ae2010-09-17 18:03:43 +0200673 depends on X86_64 && PCI && AMD_NB
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100674 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100675 Support for full DMA access of devices with 32bit memory access only
676 on systems with more than 3GB. This is usually needed for USB,
677 sound, many IDE/SATA chipsets and some other devices.
678 Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
679 based hardware IOMMU and a software bounce buffer based IOMMU used
680 on Intel systems and as fallback.
681 The code is only active when needed (enough memory and limited
682 device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
683 too.
684
685config CALGARY_IOMMU
686 bool "IBM Calgary IOMMU support"
687 select SWIOTLB
688 depends on X86_64 && PCI && EXPERIMENTAL
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100689 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100690 Support for hardware IOMMUs in IBM's xSeries x366 and x460
691 systems. Needed to run systems with more than 3GB of memory
692 properly with 32-bit PCI devices that do not support DAC
693 (Double Address Cycle). Calgary also supports bus level
694 isolation, where all DMAs pass through the IOMMU. This
695 prevents them from going anywhere except their intended
696 destination. This catches hard-to-find kernel bugs and
697 mis-behaving drivers and devices that do not use the DMA-API
698 properly to set up their DMA buffers. The IOMMU can be
699 turned off at boot time with the iommu=off parameter.
700 Normally the kernel will make the right choice by itself.
701 If unsure, say Y.
702
703config CALGARY_IOMMU_ENABLED_BY_DEFAULT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100704 def_bool y
705 prompt "Should Calgary be enabled by default?"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100706 depends on CALGARY_IOMMU
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100707 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100708 Should Calgary be enabled by default? if you choose 'y', Calgary
709 will be used (if it exists). If you choose 'n', Calgary will not be
710 used even if it exists. If you choose 'n' and would like to use
711 Calgary anyway, pass 'iommu=calgary' on the kernel command line.
712 If unsure, say Y.
713
714# need this always selected by IOMMU for the VIA workaround
715config SWIOTLB
Joerg Roedela1afd012008-11-18 12:44:21 +0100716 def_bool y if X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100717 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100718 Support for software bounce buffers used on x86-64 systems
719 which don't have a hardware IOMMU (e.g. the current generation
720 of Intel's x86-64 CPUs). Using this PCI devices which can only
721 access 32-bits of memory can be used on systems with more than
722 3 GB of memory. If unsure, say Y.
723
FUJITA Tomonoria8522502008-04-29 00:59:36 -0700724config IOMMU_HELPER
FUJITA Tomonori18b743d2008-07-10 09:50:50 +0900725 def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU)
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700726
Mike Travis1184dc22008-05-12 21:21:12 +0200727config MAXSMP
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200728 bool "Enable Maximum number of SMP Processors and NUMA Nodes"
Mike Travis36f51012008-12-16 17:33:51 -0800729 depends on X86_64 && SMP && DEBUG_KERNEL && EXPERIMENTAL
730 select CPUMASK_OFFSTACK
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100731 ---help---
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200732 Enable maximum number of CPUS and NUMA Nodes for this architecture.
Mike Travis1184dc22008-05-12 21:21:12 +0200733 If unsure, say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100734
735config NR_CPUS
Mike Travis36f51012008-12-16 17:33:51 -0800736 int "Maximum number of CPUs" if SMP && !MAXSMP
Michael K. Johnson2a3313f2009-04-21 21:44:48 -0400737 range 2 8 if SMP && X86_32 && !X86_BIGSMP
Mike Travis36f51012008-12-16 17:33:51 -0800738 range 2 512 if SMP && !MAXSMP
Mike Travis78637a92008-12-16 17:34:00 -0800739 default "1" if !SMP
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700740 default "4096" if MAXSMP
Mike Travis78637a92008-12-16 17:34:00 -0800741 default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000)
742 default "8" if SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100743 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100744 This allows you to specify the maximum number of CPUs which this
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700745 kernel will support. The maximum supported value is 512 and the
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100746 minimum value which makes sense is 2.
747
748 This is purely to save memory - each supported CPU adds
749 approximately eight kilobytes to the kernel image.
750
751config SCHED_SMT
752 bool "SMT (Hyperthreading) scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800753 depends on X86_HT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100754 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100755 SMT scheduler support improves the CPU scheduler's decision making
756 when dealing with Intel Pentium 4 chips with HyperThreading at a
757 cost of slightly increased overhead in some places. If unsure say
758 N here.
759
760config SCHED_MC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100761 def_bool y
762 prompt "Multi-core scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800763 depends on X86_HT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100764 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100765 Multi-core scheduler support improves the CPU scheduler's decision
766 making when dealing with multi-core CPU chips at a cost of slightly
767 increased overhead in some places. If unsure say N here.
768
Venkatesh Pallipadie82b8e42010-10-04 17:03:20 -0700769config IRQ_TIME_ACCOUNTING
770 bool "Fine granularity task level IRQ time accounting"
771 default n
772 ---help---
773 Select this option to enable fine granularity task irq time
774 accounting. This is done by reading a timestamp on each
775 transitions between softirq and hardirq state, so there can be a
776 small performance impact.
777
778 If in doubt, say N here.
779
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100780source "kernel/Kconfig.preempt"
781
782config X86_UP_APIC
783 bool "Local APIC support on uniprocessors"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100784 depends on X86_32 && !SMP && !X86_32_NON_STANDARD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100785 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100786 A local APIC (Advanced Programmable Interrupt Controller) is an
787 integrated interrupt controller in the CPU. If you have a single-CPU
788 system which has a processor with a local APIC, you can say Y here to
789 enable and use it. If you say Y here even though your machine doesn't
790 have a local APIC, then the kernel will still run with no slowdown at
791 all. The local APIC supports CPU-generated self-interrupts (timer,
792 performance counters), and the NMI watchdog which detects hard
793 lockups.
794
795config X86_UP_IOAPIC
796 bool "IO-APIC support on uniprocessors"
797 depends on X86_UP_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100798 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100799 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
800 SMP-capable replacement for PC-style interrupt controllers. Most
801 SMP systems and many recent uniprocessor systems have one.
802
803 If you have a single-CPU system with an IO-APIC, you can say Y here
804 to use it. If you say Y here even though your machine doesn't have
805 an IO-APIC, then the kernel will still run with no slowdown at all.
806
807config X86_LOCAL_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100808 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100809 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100810
811config X86_IO_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100812 def_bool y
Henrik Kretzschmar1444e0c2011-02-22 15:38:07 +0100813 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_IOAPIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100814
815config X86_VISWS_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100816 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100817 depends on X86_32 && X86_VISWS
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100818
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200819config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
820 bool "Reroute for broken boot IRQs"
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200821 depends on X86_IO_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100822 ---help---
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200823 This option enables a workaround that fixes a source of
824 spurious interrupts. This is recommended when threaded
825 interrupt handling is used on systems where the generation of
826 superfluous "boot interrupts" cannot be disabled.
827
828 Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
829 entry in the chipset's IO-APIC is masked (as, e.g. the RT
830 kernel does during interrupt handling). On chipsets where this
831 boot IRQ generation cannot be disabled, this workaround keeps
832 the original IRQ line masked so that only the equivalent "boot
833 IRQ" is delivered to the CPUs. The workaround also tells the
834 kernel to set up the IRQ handler on the boot IRQ line. In this
835 way only one interrupt is delivered to the kernel. Otherwise
836 the spurious second interrupt may cause the kernel to bring
837 down (vital) interrupt lines.
838
839 Only affects "broken" chipsets. Interrupt sharing may be
840 increased on these systems.
841
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100842config X86_MCE
Andi Kleenbab9bc62009-07-09 00:31:38 +0200843 bool "Machine Check / overheating reporting"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100844 ---help---
Andi Kleenbab9bc62009-07-09 00:31:38 +0200845 Machine Check support allows the processor to notify the
846 kernel if it detects a problem (e.g. overheating, data corruption).
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100847 The action the kernel takes depends on the severity of the problem,
Andi Kleenbab9bc62009-07-09 00:31:38 +0200848 ranging from warning messages to halting the machine.
Andi Kleen4efc0672009-04-28 19:07:31 +0200849
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100850config X86_MCE_INTEL
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100851 def_bool y
852 prompt "Intel MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +0200853 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100854 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100855 Additional support for intel specific MCE features such as
856 the thermal monitor.
857
858config X86_MCE_AMD
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100859 def_bool y
860 prompt "AMD MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +0200861 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100862 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100863 Additional support for AMD specific MCE features such as
864 the DRAM Error Threshold.
865
Andi Kleen4efc0672009-04-28 19:07:31 +0200866config X86_ANCIENT_MCE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100867 bool "Support for old Pentium 5 / WinChip machine checks"
Andi Kleenc31d9632009-07-09 00:31:37 +0200868 depends on X86_32 && X86_MCE
Hidetoshi Setocd13adcc2009-05-27 16:57:31 +0900869 ---help---
870 Include support for machine check handling on old Pentium 5 or WinChip
871 systems. These typically need to be enabled explicitely on the command
872 line.
Andi Kleen4efc0672009-04-28 19:07:31 +0200873
Andi Kleenb2762682009-02-12 13:49:31 +0100874config X86_MCE_THRESHOLD
875 depends on X86_MCE_AMD || X86_MCE_INTEL
Jan Beulich6fc108a2010-04-21 15:23:44 +0100876 def_bool y
Andi Kleenb2762682009-02-12 13:49:31 +0100877
Andi Kleenea149b32009-04-29 19:31:00 +0200878config X86_MCE_INJECT
Andi Kleenc1ebf832009-07-09 00:31:41 +0200879 depends on X86_MCE
Andi Kleenea149b32009-04-29 19:31:00 +0200880 tristate "Machine check injector support"
881 ---help---
882 Provide support for injecting machine checks for testing purposes.
883 If you don't know what a machine check is and you don't do kernel
884 QA it is safe to say n.
885
Andi Kleen4efc0672009-04-28 19:07:31 +0200886config X86_THERMAL_VECTOR
887 def_bool y
Andi Kleen5bb38ad2009-07-09 00:31:39 +0200888 depends on X86_MCE_INTEL
Andi Kleen4efc0672009-04-28 19:07:31 +0200889
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100890config VM86
David Rientjes6a108a12011-01-20 14:44:16 -0800891 bool "Enable VM86 support" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100892 default y
893 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100894 ---help---
895 This option is required by programs like DOSEMU to run 16-bit legacy
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100896 code on X86 processors. It also may be needed by software like
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100897 XFree86 to initialize some video cards via BIOS. Disabling this
898 option saves about 6k.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100899
900config TOSHIBA
901 tristate "Toshiba Laptop support"
902 depends on X86_32
903 ---help---
904 This adds a driver to safely access the System Management Mode of
905 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
906 not work on models with a Phoenix BIOS. The System Management Mode
907 is used to set the BIOS and power saving options on Toshiba portables.
908
909 For information on utilities to make use of this driver see the
910 Toshiba Linux utilities web site at:
911 <http://www.buzzard.org.uk/toshiba/>.
912
913 Say Y if you intend to run this kernel on a Toshiba portable.
914 Say N otherwise.
915
916config I8K
917 tristate "Dell laptop support"
Jean Delvare949a9d72011-05-25 20:43:33 +0200918 select HWMON
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100919 ---help---
920 This adds a driver to safely access the System Management Mode
921 of the CPU on the Dell Inspiron 8000. The System Management Mode
922 is used to read cpu temperature and cooling fan status and to
923 control the fans on the I8K portables.
924
925 This driver has been tested only on the Inspiron 8000 but it may
926 also work with other Dell laptops. You can force loading on other
927 models by passing the parameter `force=1' to the module. Use at
928 your own risk.
929
930 For information on utilities to make use of this driver see the
931 I8K Linux utilities web site at:
932 <http://people.debian.org/~dz/i8k/>
933
934 Say Y if you intend to run this kernel on a Dell Inspiron 8000.
935 Say N otherwise.
936
937config X86_REBOOTFIXUPS
Jan Beulich9ba16082008-10-15 22:01:38 -0700938 bool "Enable X86 board specific fixups for reboot"
939 depends on X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100940 ---help---
941 This enables chipset and/or board specific fixups to be done
942 in order to get reboot to work correctly. This is only needed on
943 some combinations of hardware and BIOS. The symptom, for which
944 this config is intended, is when reboot ends with a stalled/hung
945 system.
946
947 Currently, the only fixup is for the Geode machines using
Florian Fainelli5e3a77e2008-01-30 13:33:36 +0100948 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100949
950 Say Y if you want to enable the fixup. Currently, it's safe to
951 enable this option even if you don't need it.
952 Say N otherwise.
953
954config MICROCODE
Peter Oruba8d86f392008-07-28 18:44:21 +0200955 tristate "/dev/cpu/microcode - microcode support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100956 select FW_LOADER
957 ---help---
958 If you say Y here, you will be able to update the microcode on
Peter Oruba80cc9f12008-07-28 18:44:22 +0200959 certain Intel and AMD processors. The Intel support is for the
960 IA32 family, e.g. Pentium Pro, Pentium II, Pentium III,
961 Pentium 4, Xeon etc. The AMD support is for family 0x10 and
962 0x11 processors, e.g. Opteron, Phenom and Turion 64 Ultra.
963 You will obviously need the actual microcode binary data itself
964 which is not shipped with the Linux kernel.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100965
Peter Oruba8d86f392008-07-28 18:44:21 +0200966 This option selects the general module only, you need to select
967 at least one vendor specific module as well.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100968
969 To compile this driver as a module, choose M here: the
970 module will be called microcode.
971
Peter Oruba8d86f392008-07-28 18:44:21 +0200972config MICROCODE_INTEL
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100973 bool "Intel microcode patch loading support"
974 depends on MICROCODE
975 default MICROCODE
976 select FW_LOADER
977 ---help---
978 This options enables microcode patch loading support for Intel
979 processors.
Peter Oruba8d86f392008-07-28 18:44:21 +0200980
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100981 For latest news and information on obtaining all the required
982 Intel ingredients for this driver, check:
983 <http://www.urbanmyth.org/microcode/>.
Peter Oruba8d86f392008-07-28 18:44:21 +0200984
Peter Oruba80cc9f12008-07-28 18:44:22 +0200985config MICROCODE_AMD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100986 bool "AMD microcode patch loading support"
987 depends on MICROCODE
988 select FW_LOADER
989 ---help---
990 If you select this option, microcode patch loading support for AMD
991 processors will be enabled.
Peter Oruba80cc9f12008-07-28 18:44:22 +0200992
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100993config MICROCODE_OLD_INTERFACE
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100994 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100995 depends on MICROCODE
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100996
997config X86_MSR
998 tristate "/dev/cpu/*/msr - Model-specific register support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100999 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001000 This device gives privileged processes access to the x86
1001 Model-Specific Registers (MSRs). It is a character device with
1002 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
1003 MSR accesses are directed to a specific CPU on multi-processor
1004 systems.
1005
1006config X86_CPUID
1007 tristate "/dev/cpu/*/cpuid - CPU information support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001008 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001009 This device gives processes access to the x86 CPUID instruction to
1010 be executed on a specific processor. It is a character device
1011 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
1012 /dev/cpu/31/cpuid.
1013
1014choice
1015 prompt "High Memory Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001016 default HIGHMEM64G if X86_NUMAQ
Jan Beulich6fc108a2010-04-21 15:23:44 +01001017 default HIGHMEM4G
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001018 depends on X86_32
1019
1020config NOHIGHMEM
1021 bool "off"
1022 depends on !X86_NUMAQ
1023 ---help---
1024 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
1025 However, the address space of 32-bit x86 processors is only 4
1026 Gigabytes large. That means that, if you have a large amount of
1027 physical memory, not all of it can be "permanently mapped" by the
1028 kernel. The physical memory that's not permanently mapped is called
1029 "high memory".
1030
1031 If you are compiling a kernel which will never run on a machine with
1032 more than 1 Gigabyte total physical RAM, answer "off" here (default
1033 choice and suitable for most users). This will result in a "3GB/1GB"
1034 split: 3GB are mapped so that each process sees a 3GB virtual memory
1035 space and the remaining part of the 4GB virtual memory space is used
1036 by the kernel to permanently map as much physical memory as
1037 possible.
1038
1039 If the machine has between 1 and 4 Gigabytes physical RAM, then
1040 answer "4GB" here.
1041
1042 If more than 4 Gigabytes is used then answer "64GB" here. This
1043 selection turns Intel PAE (Physical Address Extension) mode on.
1044 PAE implements 3-level paging on IA32 processors. PAE is fully
1045 supported by Linux, PAE mode is implemented on all recent Intel
1046 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
1047 then the kernel will not boot on CPUs that don't support PAE!
1048
1049 The actual amount of total physical memory will either be
1050 auto detected or can be forced by using a kernel command line option
1051 such as "mem=256M". (Try "man bootparam" or see the documentation of
1052 your boot loader (lilo or loadlin) about how to pass options to the
1053 kernel at boot time.)
1054
1055 If unsure, say "off".
1056
1057config HIGHMEM4G
1058 bool "4GB"
1059 depends on !X86_NUMAQ
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001060 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001061 Select this if you have a 32-bit processor and between 1 and 4
1062 gigabytes of physical RAM.
1063
1064config HIGHMEM64G
1065 bool "64GB"
1066 depends on !M386 && !M486
1067 select X86_PAE
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001068 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001069 Select this if you have a 32-bit processor and more than 4
1070 gigabytes of physical RAM.
1071
1072endchoice
1073
1074choice
1075 depends on EXPERIMENTAL
David Rientjes6a108a12011-01-20 14:44:16 -08001076 prompt "Memory split" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001077 default VMSPLIT_3G
1078 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001079 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001080 Select the desired split between kernel and user memory.
1081
1082 If the address range available to the kernel is less than the
1083 physical memory installed, the remaining memory will be available
1084 as "high memory". Accessing high memory is a little more costly
1085 than low memory, as it needs to be mapped into the kernel first.
1086 Note that increasing the kernel address space limits the range
1087 available to user programs, making the address space there
1088 tighter. Selecting anything other than the default 3G/1G split
1089 will also likely make your kernel incompatible with binary-only
1090 kernel modules.
1091
1092 If you are not absolutely sure what you are doing, leave this
1093 option alone!
1094
1095 config VMSPLIT_3G
1096 bool "3G/1G user/kernel split"
1097 config VMSPLIT_3G_OPT
1098 depends on !X86_PAE
1099 bool "3G/1G user/kernel split (for full 1G low memory)"
1100 config VMSPLIT_2G
1101 bool "2G/2G user/kernel split"
1102 config VMSPLIT_2G_OPT
1103 depends on !X86_PAE
1104 bool "2G/2G user/kernel split (for full 2G low memory)"
1105 config VMSPLIT_1G
1106 bool "1G/3G user/kernel split"
1107endchoice
1108
1109config PAGE_OFFSET
1110 hex
1111 default 0xB0000000 if VMSPLIT_3G_OPT
1112 default 0x80000000 if VMSPLIT_2G
1113 default 0x78000000 if VMSPLIT_2G_OPT
1114 default 0x40000000 if VMSPLIT_1G
1115 default 0xC0000000
1116 depends on X86_32
1117
1118config HIGHMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001119 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001120 depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001121
1122config X86_PAE
Jan Beulich9ba16082008-10-15 22:01:38 -07001123 bool "PAE (Physical Address Extension) Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001124 depends on X86_32 && !HIGHMEM4G
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001125 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001126 PAE is required for NX support, and furthermore enables
1127 larger swapspace support for non-overcommit purposes. It
1128 has the cost of more pagetable lookup overhead, and also
1129 consumes more pagetable space per process.
1130
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001131config ARCH_PHYS_ADDR_T_64BIT
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001132 def_bool X86_64 || X86_PAE
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001133
FUJITA Tomonori66f2b062010-10-20 15:55:35 -07001134config ARCH_DMA_ADDR_T_64BIT
1135 def_bool X86_64 || HIGHMEM64G
1136
Nick Piggin9e899812008-10-22 12:33:16 +02001137config DIRECT_GBPAGES
David Rientjes6a108a12011-01-20 14:44:16 -08001138 bool "Enable 1GB pages for kernel pagetables" if EXPERT
Nick Piggin9e899812008-10-22 12:33:16 +02001139 default y
1140 depends on X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001141 ---help---
Nick Piggin9e899812008-10-22 12:33:16 +02001142 Allow the kernel linear mapping to use 1GB pages on CPUs that
1143 support it. This can improve the kernel's performance a tiny bit by
1144 reducing TLB pressure. If in doubt, say "Y".
1145
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001146# Common NUMA Features
1147config NUMA
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001148 bool "Numa Memory Allocation and Scheduler Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001149 depends on SMP
Rafael J. Wysocki604d2052008-11-12 23:26:14 +01001150 depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL)
Yinghai Lu0699eae2008-06-17 15:39:01 -07001151 default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001152 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001153 Enable NUMA (Non Uniform Memory Access) support.
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001154
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001155 The kernel will try to allocate memory used by a CPU on the
1156 local memory controller of the CPU and add some more
1157 NUMA awareness to the kernel.
1158
Ingo Molnarc280ea52008-11-08 13:29:45 +01001159 For 64-bit this is recommended if the system is Intel Core i7
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001160 (or later), AMD Opteron, or EM64T NUMA.
1161
1162 For 32-bit this is only needed on (rare) 32-bit-only platforms
1163 that support NUMA topologies, such as NUMAQ / Summit, or if you
1164 boot a 32-bit kernel on a 64-bit NUMA platform.
1165
1166 Otherwise, you should say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001167
1168comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
1169 depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
1170
Hans Rosenfeldeec1d4f2010-10-29 17:14:30 +02001171config AMD_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001172 def_bool y
1173 prompt "Old style AMD Opteron NUMA detection"
Tejun Heo5da0ef92011-07-11 10:34:32 +02001174 depends on X86_64 && NUMA && PCI
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001175 ---help---
Hans Rosenfeldeec1d4f2010-10-29 17:14:30 +02001176 Enable AMD NUMA node topology detection. You should say Y here if
1177 you have a multi processor AMD system. This uses an old method to
1178 read the NUMA configuration directly from the builtin Northbridge
1179 of Opteron. It is recommended to use X86_64_ACPI_NUMA instead,
1180 which also takes priority if both are compiled in.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001181
1182config X86_64_ACPI_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001183 def_bool y
1184 prompt "ACPI NUMA detection"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001185 depends on X86_64 && NUMA && ACPI && PCI
1186 select ACPI_NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001187 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001188 Enable ACPI SRAT based node topology detection.
1189
Suresh Siddha6ec6e0d2008-03-25 10:14:35 -07001190# Some NUMA nodes have memory ranges that span
1191# other nodes. Even though a pfn is valid and
1192# between a node's start and end pfns, it may not
1193# reside on that node. See memmap_init_zone()
1194# for details.
1195config NODES_SPAN_OTHER_NODES
1196 def_bool y
1197 depends on X86_64_ACPI_NUMA
1198
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001199config NUMA_EMU
1200 bool "NUMA emulation"
Tejun Heo1b7e03e2011-05-02 17:24:48 +02001201 depends on NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001202 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001203 Enable NUMA emulation. A flat machine will be split
1204 into virtual nodes when booted with "numa=fake=N", where N is the
1205 number of nodes. This is only useful for debugging.
1206
1207config NODES_SHIFT
Linus Torvaldsd25e26b2008-08-25 14:15:38 -07001208 int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
David Rientjes51591e32010-03-25 15:39:27 -07001209 range 1 10
1210 default "10" if MAXSMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001211 default "6" if X86_64
1212 default "4" if X86_NUMAQ
1213 default "3"
1214 depends on NEED_MULTIPLE_NODES
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001215 ---help---
Mike Travis1184dc22008-05-12 21:21:12 +02001216 Specify the maximum number of NUMA Nodes available on the target
Matt LaPlante692105b2009-01-26 11:12:25 +01001217 system. Increases memory reserved to accommodate various tables.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001218
Tejun Heoc1329372009-02-24 11:57:20 +09001219config HAVE_ARCH_BOOTMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001220 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001221 depends on X86_32 && NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001222
Tejun Heo3b166512011-04-01 11:15:12 +02001223config HAVE_ARCH_ALLOC_REMAP
1224 def_bool y
1225 depends on X86_32 && NUMA
1226
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001227config ARCH_HAVE_MEMORY_PRESENT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001228 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001229 depends on X86_32 && DISCONTIGMEM
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001230
1231config NEED_NODE_MEMMAP_SIZE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001232 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001233 depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001234
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001235config ARCH_FLATMEM_ENABLE
1236 def_bool y
Tejun Heo3b166512011-04-01 11:15:12 +02001237 depends on X86_32 && !NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001238
1239config ARCH_DISCONTIGMEM_ENABLE
1240 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001241 depends on NUMA && X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001242
1243config ARCH_DISCONTIGMEM_DEFAULT
1244 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001245 depends on NUMA && X86_32
1246
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001247config ARCH_SPARSEMEM_ENABLE
1248 def_bool y
Yinghai Lu4272ebf2009-01-29 15:14:46 -08001249 depends on X86_64 || NUMA || (EXPERIMENTAL && X86_32) || X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001250 select SPARSEMEM_STATIC if X86_32
1251 select SPARSEMEM_VMEMMAP_ENABLE if X86_64
1252
Tejun Heo3b166512011-04-01 11:15:12 +02001253config ARCH_SPARSEMEM_DEFAULT
1254 def_bool y
1255 depends on X86_64
1256
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001257config ARCH_SELECT_MEMORY_MODEL
1258 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001259 depends on ARCH_SPARSEMEM_ENABLE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001260
1261config ARCH_MEMORY_PROBE
1262 def_bool X86_64
1263 depends on MEMORY_HOTPLUG
1264
Tejun Heo3b166512011-04-01 11:15:12 +02001265config ARCH_PROC_KCORE_TEXT
1266 def_bool y
1267 depends on X86_64 && PROC_KCORE
1268
Avi Kivitya29815a2010-01-10 16:28:09 +02001269config ILLEGAL_POINTER_VALUE
1270 hex
1271 default 0 if X86_32
1272 default 0xdead000000000000 if X86_64
1273
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001274source "mm/Kconfig"
1275
1276config HIGHPTE
1277 bool "Allocate 3rd-level pagetables from highmem"
Jan Beulich6fc108a2010-04-21 15:23:44 +01001278 depends on HIGHMEM
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001279 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001280 The VM uses one page table entry for each page of physical memory.
1281 For systems with a lot of RAM, this can be wasteful of precious
1282 low memory. Setting this option will put user-space page table
1283 entries in high memory.
1284
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001285config X86_CHECK_BIOS_CORRUPTION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001286 bool "Check for low memory corruption"
1287 ---help---
1288 Periodically check for memory corruption in low memory, which
1289 is suspected to be caused by BIOS. Even when enabled in the
1290 configuration, it is disabled at runtime. Enable it by
1291 setting "memory_corruption_check=1" on the kernel command
1292 line. By default it scans the low 64k of memory every 60
1293 seconds; see the memory_corruption_check_size and
1294 memory_corruption_check_period parameters in
1295 Documentation/kernel-parameters.txt to adjust this.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001296
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001297 When enabled with the default parameters, this option has
1298 almost no overhead, as it reserves a relatively small amount
1299 of memory and scans it infrequently. It both detects corruption
1300 and prevents it from affecting the running system.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001301
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001302 It is, however, intended as a diagnostic tool; if repeatable
1303 BIOS-originated corruption always affects the same memory,
1304 you can use memmap= to prevent the kernel from using that
1305 memory.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001306
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001307config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001308 bool "Set the default setting of memory_corruption_check"
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001309 depends on X86_CHECK_BIOS_CORRUPTION
1310 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001311 ---help---
1312 Set whether the default state of memory_corruption_check is
1313 on or off.
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001314
H. Peter Anvin9ea77bd2010-08-25 16:38:20 -07001315config X86_RESERVE_LOW
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001316 int "Amount of low memory, in kilobytes, to reserve for the BIOS"
1317 default 64
1318 range 4 640
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001319 ---help---
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001320 Specify the amount of low memory to reserve for the BIOS.
Ingo Molnarfc381512008-09-16 10:07:34 +02001321
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001322 The first page contains BIOS data structures that the kernel
1323 must not use, so that page must always be reserved.
Ingo Molnarfc381512008-09-16 10:07:34 +02001324
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001325 By default we reserve the first 64K of physical RAM, as a
1326 number of BIOSes are known to corrupt that memory range
1327 during events such as suspend/resume or monitor cable
1328 insertion, so it must not be used by the kernel.
Ingo Molnarfc381512008-09-16 10:07:34 +02001329
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001330 You can set this to 4 if you are absolutely sure that you
1331 trust the BIOS to get all its memory reservations and usages
1332 right. If you know your BIOS have problems beyond the
1333 default 64K area, you can set this to 640 to avoid using the
1334 entire low memory range.
1335
1336 If you have doubts about the BIOS (e.g. suspend/resume does
1337 not work or there's kernel crashes after certain hardware
1338 hotplug events) then you might want to enable
1339 X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check
1340 typical corruption patterns.
1341
1342 Leave this to the default value of 64 if you are unsure.
Ingo Molnarfc381512008-09-16 10:07:34 +02001343
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001344config MATH_EMULATION
1345 bool
1346 prompt "Math emulation" if X86_32
1347 ---help---
1348 Linux can emulate a math coprocessor (used for floating point
1349 operations) if you don't have one. 486DX and Pentium processors have
1350 a math coprocessor built in, 486SX and 386 do not, unless you added
1351 a 487DX or 387, respectively. (The messages during boot time can
1352 give you some hints here ["man dmesg"].) Everyone needs either a
1353 coprocessor or this emulation.
1354
1355 If you don't have a math coprocessor, you need to say Y here; if you
1356 say Y here even though you have a coprocessor, the coprocessor will
1357 be used nevertheless. (This behavior can be changed with the kernel
1358 command line option "no387", which comes handy if your coprocessor
1359 is broken. Try "man bootparam" or see the documentation of your boot
1360 loader (lilo or loadlin) about how to pass options to the kernel at
1361 boot time.) This means that it is a good idea to say Y here if you
1362 intend to use this kernel on different machines.
1363
1364 More information about the internals of the Linux math coprocessor
1365 emulation can be found in <file:arch/x86/math-emu/README>.
1366
1367 If you are not sure, say Y; apart from resulting in a 66 KB bigger
1368 kernel, it won't hurt.
1369
1370config MTRR
Jan Beulich6fc108a2010-04-21 15:23:44 +01001371 def_bool y
David Rientjes6a108a12011-01-20 14:44:16 -08001372 prompt "MTRR (Memory Type Range Register) support" if EXPERT
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001373 ---help---
1374 On Intel P6 family processors (Pentium Pro, Pentium II and later)
1375 the Memory Type Range Registers (MTRRs) may be used to control
1376 processor access to memory ranges. This is most useful if you have
1377 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
1378 allows bus write transfers to be combined into a larger transfer
1379 before bursting over the PCI/AGP bus. This can increase performance
1380 of image write operations 2.5 times or more. Saying Y here creates a
1381 /proc/mtrr file which may be used to manipulate your processor's
1382 MTRRs. Typically the X server should use this.
1383
1384 This code has a reasonably generic interface so that similar
1385 control registers on other processors can be easily supported
1386 as well:
1387
1388 The Cyrix 6x86, 6x86MX and M II processors have Address Range
1389 Registers (ARRs) which provide a similar functionality to MTRRs. For
1390 these, the ARRs are used to emulate the MTRRs.
1391 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
1392 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
1393 write-combining. All of these processors are supported by this code
1394 and it makes sense to say Y here if you have one of them.
1395
1396 Saying Y here also fixes a problem with buggy SMP BIOSes which only
1397 set the MTRRs for the boot CPU and not for the secondary CPUs. This
1398 can lead to all sorts of problems, so it's good to say Y here.
1399
1400 You can safely say Y even if your machine doesn't have MTRRs, you'll
1401 just add about 9 KB to your kernel.
1402
Randy Dunlap7225e752008-07-26 17:54:22 -07001403 See <file:Documentation/x86/mtrr.txt> for more information.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001404
Yinghai Lu95ffa242008-04-29 03:52:33 -07001405config MTRR_SANITIZER
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001406 def_bool y
Yinghai Lu95ffa242008-04-29 03:52:33 -07001407 prompt "MTRR cleanup support"
1408 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001409 ---help---
Thomas Gleixneraba37282008-07-15 14:48:48 +02001410 Convert MTRR layout from continuous to discrete, so X drivers can
1411 add writeback entries.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001412
Thomas Gleixneraba37282008-07-15 14:48:48 +02001413 Can be disabled with disable_mtrr_cleanup on the kernel command line.
Matt LaPlante692105b2009-01-26 11:12:25 +01001414 The largest mtrr entry size for a continuous block can be set with
Thomas Gleixneraba37282008-07-15 14:48:48 +02001415 mtrr_chunk_size.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001416
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001417 If unsure, say Y.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001418
1419config MTRR_SANITIZER_ENABLE_DEFAULT
Yinghai Luf5098d62008-04-29 20:25:58 -07001420 int "MTRR cleanup enable value (0-1)"
1421 range 0 1
1422 default "0"
Yinghai Lu95ffa242008-04-29 03:52:33 -07001423 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001424 ---help---
Yinghai Luf5098d62008-04-29 20:25:58 -07001425 Enable mtrr cleanup default value
Yinghai Lu95ffa242008-04-29 03:52:33 -07001426
Yinghai Lu12031a62008-05-02 02:40:22 -07001427config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
1428 int "MTRR cleanup spare reg num (0-7)"
1429 range 0 7
1430 default "1"
1431 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001432 ---help---
Yinghai Lu12031a62008-05-02 02:40:22 -07001433 mtrr cleanup spare entries default, it can be changed via
Thomas Gleixneraba37282008-07-15 14:48:48 +02001434 mtrr_spare_reg_nr=N on the kernel command line.
Yinghai Lu12031a62008-05-02 02:40:22 -07001435
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001436config X86_PAT
Jan Beulich6fc108a2010-04-21 15:23:44 +01001437 def_bool y
David Rientjes6a108a12011-01-20 14:44:16 -08001438 prompt "x86 PAT support" if EXPERT
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001439 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001440 ---help---
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001441 Use PAT attributes to setup page level cache control.
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001442
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001443 PATs are the modern equivalents of MTRRs and are much more
1444 flexible than MTRRs.
1445
1446 Say N here if you see bootup problems (boot crash, boot hang,
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001447 spontaneous reboots) or a non-working video driver.
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001448
1449 If unsure, say Y.
1450
Venkatesh Pallipadi46cf98c2009-07-10 09:57:37 -07001451config ARCH_USES_PG_UNCACHED
1452 def_bool y
1453 depends on X86_PAT
1454
H. Peter Anvin628c6242011-07-31 13:59:29 -07001455config ARCH_RANDOM
1456 def_bool y
1457 prompt "x86 architectural random number generator" if EXPERT
1458 ---help---
1459 Enable the x86 architectural RDRAND instruction
1460 (Intel Bull Mountain technology) to generate random numbers.
1461 If supported, this is a high bandwidth, cryptographically
1462 secure hardware random number generator.
1463
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001464config EFI
Jan Beulich9ba16082008-10-15 22:01:38 -07001465 bool "EFI runtime service support"
Huang, Ying5b836832008-01-30 13:31:19 +01001466 depends on ACPI
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001467 ---help---
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001468 This enables the kernel to use EFI runtime services that are
1469 available (such as the EFI variable services).
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001470
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001471 This option is only useful on systems that have EFI firmware.
1472 In addition, you should use the latest ELILO loader available
1473 at <http://elilo.sourceforge.net> in order to take advantage
1474 of EFI runtime services. However, even with this option, the
1475 resultant kernel should continue to boot on existing non-EFI
1476 platforms.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001477
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001478config SECCOMP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001479 def_bool y
1480 prompt "Enable seccomp to safely compute untrusted bytecode"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001481 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001482 This kernel feature is useful for number crunching applications
1483 that may need to compute untrusted bytecode during their
1484 execution. By using pipes or other transports made available to
1485 the process as file descriptors supporting the read/write
1486 syscalls, it's possible to isolate those applications in
1487 their own address space using seccomp. Once seccomp is
Alexey Dobriyan9c0bbee2008-09-09 11:01:31 +04001488 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001489 and the task is only allowed to execute a few safe syscalls
1490 defined by each seccomp mode.
1491
1492 If unsure, say Y. Only embedded should say N here.
1493
1494config CC_STACKPROTECTOR
1495 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001496 ---help---
1497 This option turns on the -fstack-protector GCC feature. This
Ingo Molnar113c5412008-02-14 10:36:03 +01001498 feature puts, at the beginning of functions, a canary value on
1499 the stack just before the return address, and validates
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001500 the value just before actually returning. Stack based buffer
1501 overflows (that need to overwrite this return address) now also
1502 overwrite the canary, which gets detected and the attack is then
1503 neutralized via a kernel panic.
1504
1505 This feature requires gcc version 4.2 or above, or a distribution
1506 gcc with the feature backported. Older versions are automatically
Ingo Molnar113c5412008-02-14 10:36:03 +01001507 detected and for those versions, this configuration option is
1508 ignored. (and a warning is printed during bootup)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001509
1510source kernel/Kconfig.hz
1511
1512config KEXEC
1513 bool "kexec system call"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001514 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001515 kexec is a system call that implements the ability to shutdown your
1516 current kernel, and to start another kernel. It is like a reboot
1517 but it is independent of the system firmware. And like a reboot
1518 you can start any kernel with it, not just Linux.
1519
1520 The name comes from the similarity to the exec system call.
1521
1522 It is an ongoing process to be certain the hardware in a machine
1523 is properly shutdown, so do not be surprised if this code does not
1524 initially work for you. It may help to enable device hotplugging
1525 support. As of this writing the exact hardware interface is
1526 strongly in flux, so no good recommendation can be made.
1527
1528config CRASH_DUMP
Pavel Machek04b69442008-08-14 17:16:50 +02001529 bool "kernel crash dumps"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001530 depends on X86_64 || (X86_32 && HIGHMEM)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001531 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001532 Generate crash dump after being started by kexec.
1533 This should be normally only set in special crash dump kernels
1534 which are loaded in the main kernel with kexec-tools into
1535 a specially reserved region and then later executed after
1536 a crash by kdump/kexec. The crash dump kernel must be compiled
1537 to a memory address not used by the main kernel or BIOS using
1538 PHYSICAL_START, or it must be built as a relocatable image
1539 (CONFIG_RELOCATABLE=y).
1540 For more details see Documentation/kdump/kdump.txt
1541
Huang Ying3ab83522008-07-25 19:45:07 -07001542config KEXEC_JUMP
1543 bool "kexec jump (EXPERIMENTAL)"
1544 depends on EXPERIMENTAL
Huang Yingfee7b0d2009-03-10 10:57:16 +08001545 depends on KEXEC && HIBERNATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001546 ---help---
Huang Ying89081d12008-07-25 19:45:10 -07001547 Jump between original kernel and kexeced kernel and invoke
1548 code in physical address mode via KEXEC
Huang Ying3ab83522008-07-25 19:45:07 -07001549
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001550config PHYSICAL_START
David Rientjes6a108a12011-01-20 14:44:16 -08001551 hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP)
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001552 default "0x1000000"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001553 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001554 This gives the physical address where the kernel is loaded.
1555
1556 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
1557 bzImage will decompress itself to above physical address and
1558 run from there. Otherwise, bzImage will run from the address where
1559 it has been loaded by the boot loader and will ignore above physical
1560 address.
1561
1562 In normal kdump cases one does not have to set/change this option
1563 as now bzImage can be compiled as a completely relocatable image
1564 (CONFIG_RELOCATABLE=y) and be used to load and run from a different
1565 address. This option is mainly useful for the folks who don't want
1566 to use a bzImage for capturing the crash dump and want to use a
1567 vmlinux instead. vmlinux is not relocatable hence a kernel needs
1568 to be specifically compiled to run from a specific memory area
1569 (normally a reserved region) and this option comes handy.
1570
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001571 So if you are using bzImage for capturing the crash dump,
1572 leave the value here unchanged to 0x1000000 and set
1573 CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux
1574 for capturing the crash dump change this value to start of
1575 the reserved region. In other words, it can be set based on
1576 the "X" value as specified in the "crashkernel=YM@XM"
1577 command line boot parameter passed to the panic-ed
1578 kernel. Please take a look at Documentation/kdump/kdump.txt
1579 for more details about crash dumps.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001580
1581 Usage of bzImage for capturing the crash dump is recommended as
1582 one does not have to build two kernels. Same kernel can be used
1583 as production kernel and capture kernel. Above option should have
1584 gone away after relocatable bzImage support is introduced. But it
1585 is present because there are users out there who continue to use
1586 vmlinux for dump capture. This option should go away down the
1587 line.
1588
1589 Don't change this unless you know what you are doing.
1590
1591config RELOCATABLE
H. Peter Anvin26717802009-05-07 14:19:34 -07001592 bool "Build a relocatable kernel"
1593 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001594 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001595 This builds a kernel image that retains relocation information
1596 so it can be loaded someplace besides the default 1MB.
1597 The relocations tend to make the kernel binary about 10% larger,
1598 but are discarded at runtime.
1599
1600 One use is for the kexec on panic case where the recovery kernel
1601 must live at a different physical address than the primary
1602 kernel.
1603
1604 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
1605 it has been loaded at and the compile time physical address
1606 (CONFIG_PHYSICAL_START) is ignored.
1607
H. Peter Anvin845adf72009-05-05 21:20:51 -07001608# Relocation on x86-32 needs some additional build support
1609config X86_NEED_RELOCS
1610 def_bool y
1611 depends on X86_32 && RELOCATABLE
1612
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001613config PHYSICAL_ALIGN
Jan Beulich6fc108a2010-04-21 15:23:44 +01001614 hex "Alignment value to which kernel should be aligned" if X86_32
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001615 default "0x1000000"
1616 range 0x2000 0x1000000
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001617 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001618 This value puts the alignment restrictions on physical address
1619 where kernel is loaded and run from. Kernel is compiled for an
1620 address which meets above alignment restriction.
1621
1622 If bootloader loads the kernel at a non-aligned address and
1623 CONFIG_RELOCATABLE is set, kernel will move itself to nearest
1624 address aligned to above value and run from there.
1625
1626 If bootloader loads the kernel at a non-aligned address and
1627 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
1628 load address and decompress itself to the address it has been
1629 compiled for and run from there. The address for which kernel is
1630 compiled already meets above alignment restrictions. Hence the
1631 end result is that kernel runs from a physical address meeting
1632 above alignment restrictions.
1633
1634 Don't change this unless you know what you are doing.
1635
1636config HOTPLUG_CPU
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001637 bool "Support for hot-pluggable CPUs"
Ingo Molnar4b19ed92009-01-27 17:47:24 +01001638 depends on SMP && HOTPLUG
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001639 ---help---
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001640 Say Y here to allow turning CPUs off and on. CPUs can be
1641 controlled through /sys/devices/system/cpu.
1642 ( Note: power management support will enable this option
1643 automatically on SMP systems. )
1644 Say N if you want to disable CPU hotplug.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001645
1646config COMPAT_VDSO
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001647 def_bool y
1648 prompt "Compat VDSO support"
Roland McGrathaf65d642008-01-30 13:30:43 +01001649 depends on X86_32 || IA32_EMULATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001650 ---help---
Roland McGrathaf65d642008-01-30 13:30:43 +01001651 Map the 32-bit VDSO to the predictable old-style address too.
Randy Dunlape84446d2009-11-10 15:46:52 -08001652
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001653 Say N here if you are running a sufficiently recent glibc
1654 version (2.3.3 or later), to remove the high-mapped
1655 VDSO mapping and to exclusively use the randomized VDSO.
1656
1657 If unsure, say Y.
1658
Tim Bird516cbf32008-08-12 12:52:36 -07001659config CMDLINE_BOOL
1660 bool "Built-in kernel command line"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001661 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001662 Allow for specifying boot arguments to the kernel at
1663 build time. On some systems (e.g. embedded ones), it is
1664 necessary or convenient to provide some or all of the
1665 kernel boot arguments with the kernel itself (that is,
1666 to not rely on the boot loader to provide them.)
1667
1668 To compile command line arguments into the kernel,
1669 set this option to 'Y', then fill in the
1670 the boot arguments in CONFIG_CMDLINE.
1671
1672 Systems with fully functional boot loaders (i.e. non-embedded)
1673 should leave this option set to 'N'.
1674
1675config CMDLINE
1676 string "Built-in kernel command string"
1677 depends on CMDLINE_BOOL
1678 default ""
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001679 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001680 Enter arguments here that should be compiled into the kernel
1681 image and used at boot time. If the boot loader provides a
1682 command line at boot time, it is appended to this string to
1683 form the full kernel command line, when the system boots.
1684
1685 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
1686 change this behavior.
1687
1688 In most cases, the command line (whether built-in or provided
1689 by the boot loader) should specify the device for the root
1690 file system.
1691
1692config CMDLINE_OVERRIDE
1693 bool "Built-in command line overrides boot loader arguments"
Tim Bird516cbf32008-08-12 12:52:36 -07001694 depends on CMDLINE_BOOL
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001695 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001696 Set this option to 'Y' to have the kernel ignore the boot loader
1697 command line, and use ONLY the built-in command line.
1698
1699 This is used to work around broken boot loaders. This should
1700 be set to 'N' under normal conditions.
1701
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001702endmenu
1703
1704config ARCH_ENABLE_MEMORY_HOTPLUG
1705 def_bool y
1706 depends on X86_64 || (X86_32 && HIGHMEM)
1707
Gary Hade35551052008-10-31 10:52:03 -07001708config ARCH_ENABLE_MEMORY_HOTREMOVE
1709 def_bool y
1710 depends on MEMORY_HOTPLUG
1711
Lee Schermerhorne534c7c2010-05-26 14:44:58 -07001712config USE_PERCPU_NUMA_NODE_ID
Tejun Heo645a7912011-01-23 14:37:40 +01001713 def_bool y
Lee Schermerhorne534c7c2010-05-26 14:44:58 -07001714 depends on NUMA
1715
Bjorn Helgaasda85f862008-11-05 13:37:27 -06001716menu "Power management and ACPI options"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001717
1718config ARCH_HIBERNATION_HEADER
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001719 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001720 depends on X86_64 && HIBERNATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001721
1722source "kernel/power/Kconfig"
1723
1724source "drivers/acpi/Kconfig"
1725
Feng Tangefafc8b2009-08-14 15:23:29 -04001726source "drivers/sfi/Kconfig"
1727
Andi Kleena6b68072008-01-30 13:32:49 +01001728config X86_APM_BOOT
Jan Beulich6fc108a2010-04-21 15:23:44 +01001729 def_bool y
Andi Kleena6b68072008-01-30 13:32:49 +01001730 depends on APM || APM_MODULE
1731
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001732menuconfig APM
1733 tristate "APM (Advanced Power Management) BIOS support"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001734 depends on X86_32 && PM_SLEEP
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001735 ---help---
1736 APM is a BIOS specification for saving power using several different
1737 techniques. This is mostly useful for battery powered laptops with
1738 APM compliant BIOSes. If you say Y here, the system time will be
1739 reset after a RESUME operation, the /proc/apm device will provide
1740 battery status information, and user-space programs will receive
1741 notification of APM "events" (e.g. battery status change).
1742
1743 If you select "Y" here, you can disable actual use of the APM
1744 BIOS by passing the "apm=off" option to the kernel at boot time.
1745
1746 Note that the APM support is almost completely disabled for
1747 machines with more than one CPU.
1748
1749 In order to use APM, you will need supporting software. For location
Michael Witten2dc98fd2011-07-08 21:11:16 +00001750 and more information, read <file:Documentation/power/apm-acpi.txt>
1751 and the Battery Powered Linux mini-HOWTO, available from
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001752 <http://www.tldp.org/docs.html#howto>.
1753
1754 This driver does not spin down disk drives (see the hdparm(8)
1755 manpage ("man 8 hdparm") for that), and it doesn't turn off
1756 VESA-compliant "green" monitors.
1757
1758 This driver does not support the TI 4000M TravelMate and the ACER
1759 486/DX4/75 because they don't have compliant BIOSes. Many "green"
1760 desktop machines also don't have compliant BIOSes, and this driver
1761 may cause those machines to panic during the boot phase.
1762
1763 Generally, if you don't have a battery in your machine, there isn't
1764 much point in using this driver and you should say N. If you get
1765 random kernel OOPSes or reboots that don't seem to be related to
1766 anything, try disabling/enabling this option (or disabling/enabling
1767 APM in your BIOS).
1768
1769 Some other things you should try when experiencing seemingly random,
1770 "weird" problems:
1771
1772 1) make sure that you have enough swap space and that it is
1773 enabled.
1774 2) pass the "no-hlt" option to the kernel
1775 3) switch on floating point emulation in the kernel and pass
1776 the "no387" option to the kernel
1777 4) pass the "floppy=nodma" option to the kernel
1778 5) pass the "mem=4M" option to the kernel (thereby disabling
1779 all but the first 4 MB of RAM)
1780 6) make sure that the CPU is not over clocked.
1781 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
1782 8) disable the cache from your BIOS settings
1783 9) install a fan for the video card or exchange video RAM
1784 10) install a better fan for the CPU
1785 11) exchange RAM chips
1786 12) exchange the motherboard.
1787
1788 To compile this driver as a module, choose M here: the
1789 module will be called apm.
1790
1791if APM
1792
1793config APM_IGNORE_USER_SUSPEND
1794 bool "Ignore USER SUSPEND"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001795 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001796 This option will ignore USER SUSPEND requests. On machines with a
1797 compliant APM BIOS, you want to say N. However, on the NEC Versa M
1798 series notebooks, it is necessary to say Y because of a BIOS bug.
1799
1800config APM_DO_ENABLE
1801 bool "Enable PM at boot time"
1802 ---help---
1803 Enable APM features at boot time. From page 36 of the APM BIOS
1804 specification: "When disabled, the APM BIOS does not automatically
1805 power manage devices, enter the Standby State, enter the Suspend
1806 State, or take power saving steps in response to CPU Idle calls."
1807 This driver will make CPU Idle calls when Linux is idle (unless this
1808 feature is turned off -- see "Do CPU IDLE calls", below). This
1809 should always save battery power, but more complicated APM features
1810 will be dependent on your BIOS implementation. You may need to turn
1811 this option off if your computer hangs at boot time when using APM
1812 support, or if it beeps continuously instead of suspending. Turn
1813 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
1814 T400CDT. This is off by default since most machines do fine without
1815 this feature.
1816
1817config APM_CPU_IDLE
1818 bool "Make CPU Idle calls when idle"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001819 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001820 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
1821 On some machines, this can activate improved power savings, such as
1822 a slowed CPU clock rate, when the machine is idle. These idle calls
1823 are made after the idle loop has run for some length of time (e.g.,
1824 333 mS). On some machines, this will cause a hang at boot time or
1825 whenever the CPU becomes idle. (On machines with more than one CPU,
1826 this option does nothing.)
1827
1828config APM_DISPLAY_BLANK
1829 bool "Enable console blanking using APM"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001830 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001831 Enable console blanking using the APM. Some laptops can use this to
1832 turn off the LCD backlight when the screen blanker of the Linux
1833 virtual console blanks the screen. Note that this is only used by
1834 the virtual console screen blanker, and won't turn off the backlight
1835 when using the X Window system. This also doesn't have anything to
1836 do with your VESA-compliant power-saving monitor. Further, this
1837 option doesn't work for all laptops -- it might not turn off your
1838 backlight at all, or it might print a lot of errors to the console,
1839 especially if you are using gpm.
1840
1841config APM_ALLOW_INTS
1842 bool "Allow interrupts during APM BIOS calls"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001843 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001844 Normally we disable external interrupts while we are making calls to
1845 the APM BIOS as a measure to lessen the effects of a badly behaving
1846 BIOS implementation. The BIOS should reenable interrupts if it
1847 needs to. Unfortunately, some BIOSes do not -- especially those in
1848 many of the newer IBM Thinkpads. If you experience hangs when you
1849 suspend, try setting this to Y. Otherwise, say N.
1850
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001851endif # APM
1852
Dave Jonesbb0a56e2011-05-19 18:51:07 -04001853source "drivers/cpufreq/Kconfig"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001854
1855source "drivers/cpuidle/Kconfig"
1856
Andy Henroid27471fd2008-10-09 11:45:22 -07001857source "drivers/idle/Kconfig"
1858
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001859endmenu
1860
1861
1862menu "Bus options (PCI etc.)"
1863
1864config PCI
Ingo Molnar1ac97012008-05-19 14:10:14 +02001865 bool "PCI support"
Adrian Bunk1c858082008-01-30 13:32:32 +01001866 default y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001867 select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001868 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001869 Find out whether you have a PCI motherboard. PCI is the name of a
1870 bus system, i.e. the way the CPU talks to the other stuff inside
1871 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1872 VESA. If you have PCI, say Y, otherwise N.
1873
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001874choice
1875 prompt "PCI access mode"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001876 depends on X86_32 && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001877 default PCI_GOANY
1878 ---help---
1879 On PCI systems, the BIOS can be used to detect the PCI devices and
1880 determine their configuration. However, some old PCI motherboards
1881 have BIOS bugs and may crash if this is done. Also, some embedded
1882 PCI-based systems don't have any BIOS at all. Linux can also try to
1883 detect the PCI hardware directly without using the BIOS.
1884
1885 With this option, you can specify how Linux should detect the
1886 PCI devices. If you choose "BIOS", the BIOS will be used,
1887 if you choose "Direct", the BIOS won't be used, and if you
1888 choose "MMConfig", then PCI Express MMCONFIG will be used.
1889 If you choose "Any", the kernel will try MMCONFIG, then the
1890 direct access method and falls back to the BIOS if that doesn't
1891 work. If unsure, go with the default, which is "Any".
1892
1893config PCI_GOBIOS
1894 bool "BIOS"
1895
1896config PCI_GOMMCONFIG
1897 bool "MMConfig"
1898
1899config PCI_GODIRECT
1900 bool "Direct"
1901
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001902config PCI_GOOLPC
Daniel Drake76fb6572010-09-23 17:28:04 +01001903 bool "OLPC XO-1"
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001904 depends on OLPC
1905
Andres Salomon2bdd1b02008-06-05 14:14:41 -07001906config PCI_GOANY
1907 bool "Any"
1908
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001909endchoice
1910
1911config PCI_BIOS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001912 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001913 depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001914
1915# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
1916config PCI_DIRECT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001917 def_bool y
Shaohua Li0aba4962011-05-27 14:59:39 +08001918 depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC || PCI_GOMMCONFIG))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001919
1920config PCI_MMCONFIG
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001921 def_bool y
Feng Tang5f0db7a2009-08-14 15:37:50 -04001922 depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001923
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001924config PCI_OLPC
Andres Salomon2bdd1b02008-06-05 14:14:41 -07001925 def_bool y
1926 depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001927
Alex Nixonb5401a92010-03-18 16:31:34 -04001928config PCI_XEN
1929 def_bool y
1930 depends on PCI && XEN
1931 select SWIOTLB_XEN
1932
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001933config PCI_DOMAINS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001934 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001935 depends on PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001936
1937config PCI_MMCONFIG
1938 bool "Support mmconfig PCI config space access"
1939 depends on X86_64 && PCI && ACPI
1940
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07001941config PCI_CNB20LE_QUIRK
David Rientjes6a108a12011-01-20 14:44:16 -08001942 bool "Read CNB20LE Host Bridge Windows" if EXPERT
Bjorn Helgaas64a5fed2011-01-06 10:12:30 -07001943 default n
1944 depends on PCI && EXPERIMENTAL
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07001945 help
1946 Read the PCI windows out of the CNB20LE host bridge. This allows
1947 PCI hotplug to work on systems with the CNB20LE chipset which do
1948 not have ACPI.
1949
Bjorn Helgaas64a5fed2011-01-06 10:12:30 -07001950 There's no public spec for this chipset, and this functionality
1951 is known to be incomplete.
1952
1953 You should say N unless you know you need this.
1954
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001955source "drivers/pci/pcie/Kconfig"
1956
1957source "drivers/pci/Kconfig"
1958
David Rientjes1c00f012011-03-22 16:34:59 -07001959# x86_64 have no ISA slots, but can have ISA-style DMA.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001960config ISA_DMA_API
David Rientjes1c00f012011-03-22 16:34:59 -07001961 bool "ISA-style DMA support" if (X86_64 && EXPERT)
1962 default y
1963 help
1964 Enables ISA-style DMA support for devices requiring such controllers.
1965 If unsure, say Y.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001966
1967if X86_32
1968
1969config ISA
1970 bool "ISA support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001971 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001972 Find out whether you have ISA slots on your motherboard. ISA is the
1973 name of a bus system, i.e. the way the CPU talks to the other stuff
1974 inside your box. Other bus systems are PCI, EISA, MicroChannel
1975 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1976 newer boards don't support it. If you have ISA, say Y, otherwise N.
1977
1978config EISA
1979 bool "EISA support"
1980 depends on ISA
1981 ---help---
1982 The Extended Industry Standard Architecture (EISA) bus was
1983 developed as an open alternative to the IBM MicroChannel bus.
1984
1985 The EISA bus provided some of the features of the IBM MicroChannel
1986 bus while maintaining backward compatibility with cards made for
1987 the older ISA bus. The EISA bus saw limited use between 1988 and
1988 1995 when it was made obsolete by the PCI bus.
1989
1990 Say Y here if you are building a kernel for an EISA-based machine.
1991
1992 Otherwise, say N.
1993
1994source "drivers/eisa/Kconfig"
1995
1996config MCA
Ingo Molnar72ee6eb2009-01-27 16:57:49 +01001997 bool "MCA support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001998 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001999 MicroChannel Architecture is found in some IBM PS/2 machines and
2000 laptops. It is a bus system similar to PCI or ISA. See
2001 <file:Documentation/mca.txt> (and especially the web page given
2002 there) before attempting to build an MCA bus kernel.
2003
2004source "drivers/mca/Kconfig"
2005
2006config SCx200
2007 tristate "NatSemi SCx200 support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002008 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002009 This provides basic support for National Semiconductor's
2010 (now AMD's) Geode processors. The driver probes for the
2011 PCI-IDs of several on-chip devices, so its a good dependency
2012 for other scx200_* drivers.
2013
2014 If compiled as a module, the driver is named scx200.
2015
2016config SCx200HR_TIMER
2017 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
John Stultz592913e2010-07-13 17:56:20 -07002018 depends on SCx200
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002019 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002020 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002021 This driver provides a clocksource built upon the on-chip
2022 27MHz high-resolution timer. Its also a workaround for
2023 NSC Geode SC-1100's buggy TSC, which loses time when the
2024 processor goes idle (as is done by the scheduler). The
2025 other workaround is idle=poll boot option.
2026
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002027config OLPC
2028 bool "One Laptop Per Child support"
Thomas Gleixner54008972011-02-23 09:50:15 +01002029 depends on !X86_PAE
Andres Salomon3c554942009-12-14 18:00:36 -08002030 select GPIOLIB
Thomas Gleixnerdc3119e72011-02-23 10:08:31 +01002031 select OF
Daniel Drake45bb1672011-03-13 15:10:17 +00002032 select OF_PROMTREE
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002033 ---help---
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002034 Add support for detecting the unique features of the OLPC
2035 XO hardware.
2036
Daniel Drakea3128582011-06-25 17:34:10 +01002037config OLPC_XO1_PM
2038 bool "OLPC XO-1 Power Management"
Daniel Drake97c4cb72011-06-25 17:34:11 +01002039 depends on OLPC && MFD_CS5535 && PM_SLEEP
Daniel Drakea3128582011-06-25 17:34:10 +01002040 select MFD_CORE
Daniel Drakebf1ebf02010-10-10 10:40:32 +01002041 ---help---
Daniel Drake97c4cb72011-06-25 17:34:11 +01002042 Add support for poweroff and suspend of the OLPC XO-1 laptop.
Daniel Drakebf1ebf02010-10-10 10:40:32 +01002043
Daniel Drakecfee9592011-06-25 17:34:17 +01002044config OLPC_XO1_RTC
2045 bool "OLPC XO-1 Real Time Clock"
2046 depends on OLPC_XO1_PM && RTC_DRV_CMOS
2047 ---help---
2048 Add support for the XO-1 real time clock, which can be used as a
2049 programmable wakeup source.
2050
Daniel Drake7feda8e2011-06-25 17:34:12 +01002051config OLPC_XO1_SCI
2052 bool "OLPC XO-1 SCI extras"
Daniel Draked8d01a62011-07-24 18:33:21 +01002053 depends on OLPC && OLPC_XO1_PM
2054 select POWER_SUPPLY
Daniel Drake7feda8e2011-06-25 17:34:12 +01002055 select GPIO_CS5535
2056 select MFD_CORE
2057 ---help---
2058 Add support for SCI-based features of the OLPC XO-1 laptop:
Daniel Drake7bc74b32011-06-25 17:34:14 +01002059 - EC-driven system wakeups
Daniel Drake7feda8e2011-06-25 17:34:12 +01002060 - Power button
Daniel Drake7bc74b32011-06-25 17:34:14 +01002061 - Ebook switch
Daniel Drake2cf2bae2011-06-25 17:34:15 +01002062 - Lid switch
Daniel Drakee1040ac2011-06-25 17:34:16 +01002063 - AC adapter status updates
2064 - Battery status updates
Daniel Drake7feda8e2011-06-25 17:34:12 +01002065
Daniel Drakea0f30f52011-06-25 17:34:18 +01002066config OLPC_XO15_SCI
2067 bool "OLPC XO-1.5 SCI extras"
Daniel Draked8d01a62011-07-24 18:33:21 +01002068 depends on OLPC && ACPI
2069 select POWER_SUPPLY
Daniel Drakea0f30f52011-06-25 17:34:18 +01002070 ---help---
2071 Add support for SCI-based features of the OLPC XO-1.5 laptop:
2072 - EC-driven system wakeups
2073 - AC adapter status updates
2074 - Battery status updates
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002075
Ed Wildgoosed4f3e352011-09-20 14:00:12 -07002076config ALIX
2077 bool "PCEngines ALIX System Support (LED setup)"
2078 select GPIOLIB
2079 ---help---
2080 This option enables system support for the PCEngines ALIX.
2081 At present this just sets up LEDs for GPIO control on
2082 ALIX2/3/6 boards. However, other system specific setup should
2083 get added here.
2084
2085 Note: You must still enable the drivers for GPIO and LED support
2086 (GPIO_CS5535 & LEDS_GPIO) to actually use the LEDs
2087
2088 Note: You have to set alix.force=1 for boards with Award BIOS.
2089
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002090endif # X86_32
2091
Andreas Herrmann23ac4ae2010-09-17 18:03:43 +02002092config AMD_NB
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002093 def_bool y
Borislav Petkov0e152cd2010-03-12 15:43:03 +01002094 depends on CPU_SUP_AMD && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002095
2096source "drivers/pcmcia/Kconfig"
2097
2098source "drivers/pci/hotplug/Kconfig"
2099
Alexandre Bounine388b78a2011-03-23 16:43:03 -07002100config RAPIDIO
2101 bool "RapidIO support"
2102 depends on PCI
2103 default n
2104 help
2105 If you say Y here, the kernel will include drivers and
2106 infrastructure code to support RapidIO interconnect devices.
2107
2108source "drivers/rapidio/Kconfig"
2109
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002110endmenu
2111
2112
2113menu "Executable file formats / Emulations"
2114
2115source "fs/Kconfig.binfmt"
2116
2117config IA32_EMULATION
2118 bool "IA32 Emulation"
2119 depends on X86_64
Roland McGratha97f52e2008-01-30 13:31:55 +01002120 select COMPAT_BINFMT_ELF
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002121 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002122 Include code to run 32-bit programs under a 64-bit kernel. You should
2123 likely turn this on, unless you're 100% sure that you don't have any
2124 32-bit programs left.
2125
2126config IA32_AOUT
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002127 tristate "IA32 a.out support"
2128 depends on IA32_EMULATION
2129 ---help---
2130 Support old a.out binaries in the 32bit emulation.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002131
2132config COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002133 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002134 depends on IA32_EMULATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002135
2136config COMPAT_FOR_U64_ALIGNMENT
2137 def_bool COMPAT
2138 depends on X86_64
2139
2140config SYSVIPC_COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002141 def_bool y
Alexey Dobriyanb8992192008-09-14 13:44:41 +04002142 depends on COMPAT && SYSVIPC
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002143
David Howellsee009e42011-03-07 15:06:20 +00002144config KEYS_COMPAT
2145 bool
2146 depends on COMPAT && KEYS
2147 default y
2148
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002149endmenu
2150
2151
Keith Packarde5beae12008-11-03 18:21:45 +01002152config HAVE_ATOMIC_IOMAP
2153 def_bool y
2154 depends on X86_32
2155
Masami Hiramatsu3cba11d2010-10-14 12:10:42 +09002156config HAVE_TEXT_POKE_SMP
2157 bool
2158 select STOP_MACHINE if SMP
2159
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002160source "net/Kconfig"
2161
2162source "drivers/Kconfig"
2163
2164source "drivers/firmware/Kconfig"
2165
2166source "fs/Kconfig"
2167
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002168source "arch/x86/Kconfig.debug"
2169
2170source "security/Kconfig"
2171
2172source "crypto/Kconfig"
2173
Avi Kivityedf88412007-12-16 11:02:48 +02002174source "arch/x86/kvm/Kconfig"
2175
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002176source "lib/Kconfig"