blob: e330da21b84f0636751b7e18e921ecff9cc31f55 [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
11
12config X86_64
13 def_bool 64BIT
Sam Ravnborg1032c0b2007-11-06 21:35:08 +010014
15### Arch settings
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010016config X86
Harvey Harrison3c2362e2008-01-30 13:31:03 +010017 def_bool y
David Woodhousee17c6d52008-06-17 12:19:34 +010018 select HAVE_AOUT if X86_32
Hitoshi Mitake2c5643b2008-11-30 17:16:04 +090019 select HAVE_READQ
20 select HAVE_WRITEQ
Ingo Molnara5574cf2008-05-05 23:19:50 +020021 select HAVE_UNSTABLE_SCHED_CLOCK
Sam Ravnborgec7748b2008-02-09 10:46:40 +010022 select HAVE_IDE
Mathieu Desnoyers42d4b832008-02-02 15:10:34 -050023 select HAVE_OPROFILE
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 Carstensf850c30c2010-02-10 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
Albin Tonnerre13510992010-01-08 14:42:45 -080054 select HAVE_KERNEL_LZO
K.Prasad0067f122009-06-01 23:43:57 +053055 select HAVE_HW_BREAKPOINT
Frederic Weisbecker01027522010-04-11 18:55:56 +020056 select HAVE_MIXED_BREAKPOINTS_REGS
Frederic Weisbecker99e8c5a2009-12-17 01:33:54 +010057 select PERF_EVENTS
Frederic Weisbeckerc01d4322010-05-15 22:57:48 +020058 select HAVE_PERF_EVENTS_NMI
Frederic Weisbecker99e8c5a2009-12-17 01:33:54 +010059 select ANON_INODES
Pekka Enberg0a4af3b2009-02-26 21:38:56 +020060 select HAVE_ARCH_KMEMCHECK
Avi Kivity7c68af62009-09-19 09:40:22 +030061 select HAVE_USER_RETURN_NOTIFIER
Steven Rostedt46eb3b62010-09-22 23:10:23 -040062 select HAVE_ARCH_JUMP_LABEL
Masami Hiramatsu3cba11d2010-10-14 12:10:42 +090063 select HAVE_TEXT_POKE_SMP
Thomas Gleixner3bb98082010-09-27 12:46:02 +000064 select HAVE_GENERIC_HARDIRQS
65 select HAVE_SPARSE_IRQ
Thomas Gleixner3bb98082010-09-27 12:46:02 +000066 select GENERIC_IRQ_PROBE
67 select GENERIC_PENDING_IRQ if SMP
Balbir Singh7d8330a2008-02-10 12:46:28 +053068
Ingo Molnarba7e4d12009-06-06 13:58:12 +020069config INSTRUCTION_DECODER
70 def_bool (KPROBES || PERF_EVENTS)
71
Linus Torvalds51b26ad2009-04-26 10:12:47 -070072config OUTPUT_FORMAT
73 string
74 default "elf32-i386" if X86_32
75 default "elf64-x86-64" if X86_64
76
Sam Ravnborg73531902008-05-25 23:03:18 +020077config ARCH_DEFCONFIG
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +020078 string
Sam Ravnborg73531902008-05-25 23:03:18 +020079 default "arch/x86/configs/i386_defconfig" if X86_32
80 default "arch/x86/configs/x86_64_defconfig" if X86_64
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +020081
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010082config GENERIC_CMOS_UPDATE
Harvey Harrison3c2362e2008-01-30 13:31:03 +010083 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010084
85config CLOCKSOURCE_WATCHDOG
Harvey Harrison3c2362e2008-01-30 13:31:03 +010086 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010087
88config GENERIC_CLOCKEVENTS
Harvey Harrison3c2362e2008-01-30 13:31:03 +010089 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010090
91config GENERIC_CLOCKEVENTS_BROADCAST
Harvey Harrison3c2362e2008-01-30 13:31:03 +010092 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010093 depends on X86_64 || (X86_32 && X86_LOCAL_APIC)
94
95config LOCKDEP_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +010096 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010097
98config STACKTRACE_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +010099 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100100
Heiko Carstensaa7d9352008-02-01 17:45:14 +0100101config HAVE_LATENCYTOP_SUPPORT
102 def_bool y
103
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100104config MMU
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100105 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100106
107config ZONE_DMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100108 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100109
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100110config SBUS
111 bool
112
FUJITA Tomonori3bc4e452010-03-10 15:23:22 -0800113config NEED_DMA_MAP_STATE
114 def_bool (X86_64 || DMAR || DMA_API_DEBUG)
115
FUJITA Tomonori18e98302010-05-26 14:44:32 -0700116config NEED_SG_DMA_LENGTH
Andrew Morton4a14d842010-05-26 14:44:33 -0700117 def_bool y
FUJITA Tomonori18e98302010-05-26 14:44:32 -0700118
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100119config GENERIC_ISA_DMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100120 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100121
122config GENERIC_IOMAP
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100123 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100124
125config GENERIC_BUG
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100126 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100127 depends on BUG
Jan Beulichb93a5312008-12-16 11:40:27 +0000128 select GENERIC_BUG_RELATIVE_POINTERS if X86_64
129
130config GENERIC_BUG_RELATIVE_POINTERS
131 bool
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100132
133config GENERIC_HWEIGHT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100134 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100135
Florian Fainellia6082952008-01-30 13:33:35 +0100136config GENERIC_GPIO
Jan Beulich9ba16082008-10-15 22:01:38 -0700137 bool
Florian Fainellia6082952008-01-30 13:33:35 +0100138
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100139config ARCH_MAY_HAVE_PC_FDC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100140 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100141
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100142config RWSEM_GENERIC_SPINLOCK
143 def_bool !X86_XADD
144
145config RWSEM_XCHGADD_ALGORITHM
146 def_bool X86_XADD
147
Venki Pallipadia6869cc2008-02-08 17:05:44 -0800148config ARCH_HAS_CPU_IDLE_WAIT
149 def_bool y
150
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100151config GENERIC_CALIBRATE_DELAY
152 def_bool y
153
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100154config GENERIC_TIME_VSYSCALL
155 bool
156 default X86_64
157
venkatesh.pallipadi@intel.com9a0b8412008-01-31 17:35:06 -0800158config ARCH_HAS_CPU_RELAX
159 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100160
Venkatesh Pallipadi89cedfe2008-10-16 19:00:08 -0400161config ARCH_HAS_DEFAULT_IDLE
162 def_bool y
163
Pekka Enberg1b27d052008-04-28 02:12:22 -0700164config ARCH_HAS_CACHE_LINE_SIZE
165 def_bool y
166
Mike Travisdd5af902008-01-30 13:33:32 +0100167config HAVE_SETUP_PER_CPU_AREA
Brian Gerst89c9c4c2009-01-27 12:56:48 +0900168 def_bool y
travis@sgi.comb32ef632008-01-30 13:32:51 +0100169
Tejun Heo08fc4582009-08-14 15:00:49 +0900170config NEED_PER_CPU_EMBED_FIRST_CHUNK
171 def_bool y
172
173config NEED_PER_CPU_PAGE_FIRST_CHUNK
Tejun Heo11124412009-02-20 16:29:09 +0900174 def_bool y
175
Mike Travis9f0e8d02008-04-04 18:11:01 -0700176config HAVE_CPUMASK_OF_CPU_MAP
177 def_bool X86_64_SMP
178
Johannes Berg801e4062007-12-08 02:12:39 +0100179config ARCH_HIBERNATION_POSSIBLE
180 def_bool y
Johannes Berg801e4062007-12-08 02:12:39 +0100181
Johannes Bergf4cb5702007-12-08 02:14:00 +0100182config ARCH_SUSPEND_POSSIBLE
183 def_bool y
Johannes Bergf4cb5702007-12-08 02:14:00 +0100184
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100185config ZONE_DMA32
186 bool
187 default X86_64
188
189config ARCH_POPULATES_NODE_MAP
190 def_bool y
191
192config AUDIT_ARCH
193 bool
194 default X86_64
195
Ingo Molnar765c68b2008-04-09 11:03:37 +0200196config ARCH_SUPPORTS_OPTIMIZED_INLINING
197 def_bool y
198
Akinobu Mita6a11f752009-03-31 15:23:17 -0700199config ARCH_SUPPORTS_DEBUG_PAGEALLOC
200 def_bool y
201
Shane Wang69575d32009-09-01 18:25:07 -0700202config HAVE_INTEL_TXT
203 def_bool y
204 depends on EXPERIMENTAL && DMAR && ACPI
205
James Bottomley6cd10f82008-11-09 11:53:14 -0600206config USE_GENERIC_SMP_HELPERS
207 def_bool y
208 depends on SMP
209
Sam Ravnborg6b0c3d42008-01-30 13:32:27 +0100210config X86_32_SMP
211 def_bool y
212 depends on X86_32 && SMP
213
214config X86_64_SMP
215 def_bool y
216 depends on X86_64 && SMP
217
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100218config X86_HT
Jan Beulich6fc108a2010-04-21 15:23:44 +0100219 def_bool y
Adrian Bunkee0011a2007-12-04 17:19:07 +0100220 depends on SMP
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100221
222config X86_TRAMPOLINE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100223 def_bool y
Ingo Molnar3e5095d2009-01-27 17:07:08 +0100224 depends on SMP || (64BIT && ACPI_SLEEP)
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100225
Tejun Heoccbeed32009-02-09 22:17:40 +0900226config X86_32_LAZY_GS
227 def_bool y
Tejun Heo60a53172009-02-09 22:17:40 +0900228 depends on X86_32 && !CC_STACKPROTECTOR
Tejun Heoccbeed32009-02-09 22:17:40 +0900229
Borislav Petkovd61931d2010-03-05 17:34:46 +0100230config ARCH_HWEIGHT_CFLAGS
231 string
232 default "-fcall-saved-ecx -fcall-saved-edx" if X86_32
233 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
234
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100235config KTIME_SCALAR
236 def_bool X86_32
Borislav Petkovd7c53c92010-08-19 20:10:29 +0200237
238config ARCH_CPU_PROBE_RELEASE
239 def_bool y
240 depends on HOTPLUG_CPU
241
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100242source "init/Kconfig"
Matt Helsleydc52ddc2008-10-18 20:27:21 -0700243source "kernel/Kconfig.freezer"
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100244
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100245menu "Processor type and features"
246
247source "kernel/time/Kconfig"
248
249config SMP
250 bool "Symmetric multi-processing support"
251 ---help---
252 This enables support for systems with more than one CPU. If you have
253 a system with only one CPU, like most personal computers, say N. If
254 you have a system with more than one CPU, say Y.
255
256 If you say N here, the kernel will run on single and multiprocessor
257 machines, but will use only one CPU of a multiprocessor machine. If
258 you say Y here, the kernel will run on many, but not all,
259 singleprocessor machines. On a singleprocessor machine, the kernel
260 will run faster if you say N here.
261
262 Note that if you say Y here and choose architecture "586" or
263 "Pentium" under "Processor family", the kernel will not work on 486
264 architectures. Similarly, multiprocessor kernels for the "PPro"
265 architecture may not work on all Pentium based boards.
266
267 People using multiprocessor machines who say Y here should also say
268 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
269 Management" code will be disabled if you say Y here.
270
Adrian Bunk03502fa2008-02-03 15:50:21 +0200271 See also <file:Documentation/i386/IO-APIC.txt>,
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100272 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
273 <http://www.tldp.org/docs.html#howto>.
274
275 If you don't know what to do here, say N.
276
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800277config X86_X2APIC
278 bool "Support x2apic"
David Woodhousef7d7f862009-04-06 23:04:40 -0700279 depends on X86_LOCAL_APIC && X86_64 && INTR_REMAP
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800280 ---help---
281 This enables x2apic support on CPUs that have this feature.
282
283 This allows 32-bit apic IDs (so it can support very large systems),
284 and accesses the local apic via MSRs not via mmio.
285
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800286 If you don't know what to do here, say N.
287
Yinghai Lu6695c852008-06-19 12:13:09 -0700288config X86_MPPARSE
Jan Beulich7a527682008-10-30 10:38:24 +0000289 bool "Enable MPS table" if ACPI
290 default y
Ingo Molnar5ab74722008-07-10 14:42:03 +0200291 depends on X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100292 ---help---
Yinghai Lu6695c852008-06-19 12:13:09 -0700293 For old smp systems that do not have proper acpi support. Newer systems
294 (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
Yinghai Lu6695c852008-06-19 12:13:09 -0700295
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800296config X86_BIGSMP
297 bool "Support for big SMP systems with more than 8 CPUs"
298 depends on X86_32 && SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100299 ---help---
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800300 This option is needed for the systems that have more than 8 CPUs
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100301
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800302if X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800303config X86_EXTENDED_PLATFORM
304 bool "Support for extended (non-PC) x86 platforms"
305 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100306 ---help---
Ingo Molnar06ac8342009-01-27 18:11:43 +0100307 If you disable this option then the kernel will only support
308 standard PC platforms. (which covers the vast majority of
309 systems out there.)
310
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800311 If you enable this option then you'll be able to select support
312 for the following (non-PC) 32 bit x86 platforms:
313 AMD Elan
314 NUMAQ (IBM/Sequent)
315 RDC R-321x SoC
316 SGI 320/540 (Visual Workstation)
317 Summit/EXA (IBM x440)
318 Unisys ES7000 IA32 series
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200319 Moorestown MID devices
Ingo Molnar06ac8342009-01-27 18:11:43 +0100320
321 If you have one of these systems, or if you want to build a
322 generic distribution kernel, say Y here - otherwise say N.
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800323endif
Ingo Molnar06ac8342009-01-27 18:11:43 +0100324
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800325if X86_64
326config X86_EXTENDED_PLATFORM
327 bool "Support for extended (non-PC) x86 platforms"
328 default y
329 ---help---
330 If you disable this option then the kernel will only support
331 standard PC platforms. (which covers the vast majority of
332 systems out there.)
333
334 If you enable this option then you'll be able to select support
335 for the following (non-PC) 64 bit x86 platforms:
336 ScaleMP vSMP
337 SGI Ultraviolet
338
339 If you have one of these systems, or if you want to build a
340 generic distribution kernel, say Y here - otherwise say N.
341endif
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800342# This is an alphabetically sorted list of 64 bit extended platforms
343# Please maintain the alphabetic order if and when there are additions
Nick Piggin03b48632009-01-20 04:36:04 +0100344
Ingo Molnar6a485652009-01-27 18:29:13 +0100345config X86_VSMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800346 bool "ScaleMP vSMP"
Randy Dunlap03f1a172010-10-13 21:00:23 -0700347 select PARAVIRT_GUEST
Ingo Molnar6a485652009-01-27 18:29:13 +0100348 select PARAVIRT
349 depends on X86_64 && PCI
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800350 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100351 ---help---
Ingo Molnar6a485652009-01-27 18:29:13 +0100352 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
353 supposed to run on these EM64T-based machines. Only choose this option
354 if you have one of these machines.
355
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800356config X86_UV
357 bool "SGI Ultraviolet"
358 depends on X86_64
359 depends on X86_EXTENDED_PLATFORM
Jack Steiner54c28d22009-04-03 15:39:42 -0500360 depends on NUMA
Suresh Siddha9d6c26e2009-04-20 13:02:31 -0700361 depends on X86_X2APIC
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800362 ---help---
363 This option is needed in order to support SGI Ultraviolet systems.
364 If you don't have one of these, you should say N here.
365
366# Following is an alphabetically sorted list of 32 bit extended platforms
367# Please maintain the alphabetic order if and when there are additions
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100368
369config X86_ELAN
370 bool "AMD Elan"
371 depends on X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800372 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100373 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100374 Select this for an AMD Elan processor.
375
376 Do not use this option for K6/Athlon/Opteron processors!
377
378 If unsure, choose "PC-compatible" instead.
379
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200380config X86_MRST
381 bool "Moorestown MID platform"
Jacob Pan4b2f3f72010-02-25 10:02:14 -0800382 depends on PCI
383 depends on PCI_GOANY
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200384 depends on X86_32
385 depends on X86_EXTENDED_PLATFORM
Jacob Pan4b2f3f72010-02-25 10:02:14 -0800386 depends on X86_IO_APIC
Jacob Panbb24c472009-09-02 07:37:17 -0700387 select APB_TIMER
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200388 ---help---
389 Moorestown is Intel's Low Power Intel Architecture (LPIA) based Moblin
390 Internet Device(MID) platform. Moorestown consists of two chips:
391 Lincroft (CPU core, graphics, and memory controller) and Langwell IOH.
392 Unlike standard x86 PCs, Moorestown does not have many legacy devices
393 nor standard legacy replacement devices/features. e.g. Moorestown does
394 not contain i8259, i8254, HPET, legacy BIOS, most of the io ports.
395
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800396config X86_RDC321X
397 bool "RDC R-321x SoC"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100398 depends on X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800399 depends on X86_EXTENDED_PLATFORM
400 select M486
401 select X86_REBOOTFIXUPS
402 ---help---
403 This option is needed for RDC R-321x system-on-chip, also known
404 as R-8610-(G).
405 If you don't have one of these chips, you should say N here.
406
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100407config X86_32_NON_STANDARD
Ingo Molnar9c398012009-01-27 18:24:57 +0100408 bool "Support non-standard 32-bit SMP architectures"
409 depends on X86_32 && SMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800410 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100411 ---help---
412 This option compiles in the NUMAQ, Summit, bigsmp, ES7000, default
Yinghai Lud49c4282008-06-08 18:31:54 -0700413 subarchitectures. It is intended for a generic binary kernel.
414 if you select them all, kernel will probe it one by one. and will
415 fallback to default.
416
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800417# Alphabetically sorted list of Non standard 32 bit platforms
Yinghai Lud49c4282008-06-08 18:31:54 -0700418
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100419config X86_NUMAQ
420 bool "NUMAQ (IBM/Sequent)"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100421 depends on X86_32_NON_STANDARD
Pan, Jacob juna92d1522010-02-24 16:59:55 -0800422 depends on PCI
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100423 select NUMA
Ingo Molnar9c398012009-01-27 18:24:57 +0100424 select X86_MPPARSE
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100425 ---help---
Yinghai Lud49c4282008-06-08 18:31:54 -0700426 This option is used for getting Linux to run on a NUMAQ (IBM/Sequent)
427 NUMA multiquad box. This changes the way that processors are
428 bootstrapped, and uses Clustered Logical APIC addressing mode instead
429 of Flat Logical. You will need a new lynxer.elf file to flash your
430 firmware with - send email to <Martin.Bligh@us.ibm.com>.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100431
Linus Torvaldsd949f362009-09-26 09:35:07 -0700432config X86_SUPPORTS_MEMORY_FAILURE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100433 def_bool y
Linus Torvaldsd949f362009-09-26 09:35:07 -0700434 # MCE code calls memory_failure():
435 depends on X86_MCE
436 # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
437 depends on !X86_NUMAQ
438 # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
439 depends on X86_64 || !SPARSEMEM
440 select ARCH_SUPPORTS_MEMORY_FAILURE
Linus Torvaldsd949f362009-09-26 09:35:07 -0700441
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200442config X86_VISWS
443 bool "SGI 320/540 (Visual Workstation)"
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800444 depends on X86_32 && PCI && X86_MPPARSE && PCI_GODIRECT
445 depends on X86_32_NON_STANDARD
446 ---help---
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200447 The SGI Visual Workstation series is an IA32-based workstation
448 based on SGI systems chips with some legacy PC hardware attached.
449
450 Say Y here to create a kernel to run on the SGI 320 or 540.
451
452 A kernel compiled for the Visual Workstation will run on general
453 PCs as well. See <file:Documentation/sgi-visws.txt> for details.
454
Ingo Molnar9c398012009-01-27 18:24:57 +0100455config X86_SUMMIT
456 bool "Summit/EXA (IBM x440)"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100457 depends on X86_32_NON_STANDARD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100458 ---help---
Ingo Molnar9c398012009-01-27 18:24:57 +0100459 This option is needed for IBM systems that use the Summit/EXA chipset.
460 In particular, it is needed for the x440.
Ingo Molnar1f972762008-07-26 13:52:50 +0200461
Ingo Molnar9c398012009-01-27 18:24:57 +0100462config X86_ES7000
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800463 bool "Unisys ES7000 IA32 series"
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800464 depends on X86_32_NON_STANDARD && X86_BIGSMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100465 ---help---
Ingo Molnar9c398012009-01-27 18:24:57 +0100466 Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
467 supposed to run on an IA32-based Unisys ES7000 system.
468
Ingo Molnarae1e9132008-11-11 09:05:16 +0100469config SCHED_OMIT_FRAME_POINTER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100470 def_bool y
471 prompt "Single-depth WCHAN output"
Ken Chena87d0912008-11-06 11:10:49 -0800472 depends on X86
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100473 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100474 Calculate simpler /proc/<PID>/wchan values. If this option
475 is disabled then wchan values will recurse back to the
476 caller function. This provides more accurate wchan values,
477 at the expense of slightly more scheduling overhead.
478
479 If in doubt, say "Y".
480
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100481menuconfig PARAVIRT_GUEST
482 bool "Paravirtualized guest support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100483 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100484 Say Y here to get to see options related to running Linux under
485 various hypervisors. This option alone does not add any kernel code.
486
487 If you say N, all options in this submenu will be skipped and disabled.
488
489if PARAVIRT_GUEST
490
491source "arch/x86/xen/Kconfig"
492
Glauber de Oliveira Costa790c73f2008-02-15 17:52:48 -0200493config KVM_CLOCK
494 bool "KVM paravirtualized clock"
495 select PARAVIRT
Gerd Hoffmannf6e16d52008-06-03 16:17:32 +0200496 select PARAVIRT_CLOCK
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100497 ---help---
Glauber de Oliveira Costa790c73f2008-02-15 17:52:48 -0200498 Turning on this option will allow you to run a paravirtualized clock
499 when running over the KVM hypervisor. Instead of relying on a PIT
500 (or probably other) emulation by the underlying device model, the host
501 provides the guest with timing infrastructure such as time of day, and
502 system time
503
Marcelo Tosatti0cf1bfd2008-02-22 12:21:36 -0500504config KVM_GUEST
505 bool "KVM Guest support"
506 select PARAVIRT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100507 ---help---
508 This option enables various optimizations for running under the KVM
509 hypervisor.
Marcelo Tosatti0cf1bfd2008-02-22 12:21:36 -0500510
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100511source "arch/x86/lguest/Kconfig"
512
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100513config PARAVIRT
514 bool "Enable paravirtualization code"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100515 ---help---
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100516 This changes the kernel so it can modify itself when it is run
517 under a hypervisor, potentially improving performance significantly
518 over full virtualization. However, when run without a hypervisor
519 the kernel is theoretically slower and slightly larger.
520
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700521config PARAVIRT_SPINLOCKS
522 bool "Paravirtualization layer for spinlocks"
523 depends on PARAVIRT && SMP && EXPERIMENTAL
524 ---help---
525 Paravirtualized spinlocks allow a pvops backend to replace the
526 spinlock implementation with something virtualization-friendly
527 (for example, block the virtual CPU rather than spinning).
528
529 Unfortunately the downside is an up to 5% performance hit on
530 native kernels, with various workloads.
531
532 If you are unsure how to answer this question, answer N.
533
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200534config PARAVIRT_CLOCK
535 bool
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200536
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100537endif
538
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400539config PARAVIRT_DEBUG
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100540 bool "paravirt-ops debugging"
541 depends on PARAVIRT && DEBUG_KERNEL
542 ---help---
543 Enable to debug paravirt_ops internals. Specifically, BUG if
544 a paravirt_op is missing when it is called.
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400545
Yinghai Lu08677212010-02-10 01:20:20 -0800546config NO_BOOTMEM
Yinghai Lu774ea0b2010-08-25 13:39:18 -0700547 def_bool y
Yinghai Lu08677212010-02-10 01:20:20 -0800548
Yinghai Lu03273182008-04-18 17:49:15 -0700549config MEMTEST
550 bool "Memtest"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100551 ---help---
Yinghai Luc64df702008-03-21 18:56:19 -0700552 This option adds a kernel parameter 'memtest', which allows memtest
Yinghai Lu03273182008-04-18 17:49:15 -0700553 to be set.
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100554 memtest=0, mean disabled; -- default
555 memtest=1, mean do 1 test pattern;
556 ...
557 memtest=4, mean do 4 test patterns.
Thomas Gleixneraba37282008-07-15 14:48:48 +0200558 If you are unsure how to answer this question, answer N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100559
560config X86_SUMMIT_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100561 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100562 depends on X86_32 && NUMA && X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100563
564config X86_CYCLONE_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100565 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100566 depends on X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100567
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100568source "arch/x86/Kconfig.cpu"
569
570config HPET_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100571 def_bool X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100572 prompt "HPET Timer Support" if X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100573 ---help---
574 Use the IA-PC HPET (High Precision Event Timer) to manage
575 time in preference to the PIT and RTC, if a HPET is
576 present.
577 HPET is the next generation timer replacing legacy 8254s.
578 The HPET provides a stable time base on SMP
579 systems, unlike the TSC, but it is more expensive to access,
580 as it is off-chip. You can find the HPET spec at
581 <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100582
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100583 You can safely choose Y here. However, HPET will only be
584 activated if the platform and the BIOS support this feature.
585 Otherwise the 8254 will be used for timing services.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100586
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100587 Choose N to continue using the legacy 8254 timer.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100588
589config HPET_EMULATE_RTC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100590 def_bool y
Bernhard Walle9d8af782008-02-06 01:38:52 -0800591 depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100592
Jacob Panbb24c472009-09-02 07:37:17 -0700593config APB_TIMER
594 def_bool y if MRST
595 prompt "Langwell APB Timer Support" if X86_MRST
596 help
597 APB timer is the replacement for 8254, HPET on X86 MID platforms.
598 The APBT provides a stable time base on SMP
599 systems, unlike the TSC, but it is more expensive to access,
600 as it is off-chip. APB timers are always running regardless of CPU
601 C states, they are used as per CPU clockevent device when possible.
602
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100603# Mark as embedded because too many people got it wrong.
604# The code disables itself when not needed.
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700605config DMI
606 default y
607 bool "Enable DMI scanning" if EMBEDDED
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100608 ---help---
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700609 Enabled scanning of DMI to identify machine quirks. Say Y
610 here unless you have verified that your setup is not
611 affected by entries in the DMI blacklist. Required by PNP
612 BIOS code.
613
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100614config GART_IOMMU
615 bool "GART IOMMU support" if EMBEDDED
616 default y
617 select SWIOTLB
Andreas Herrmann23ac4ae2010-09-17 18:03:43 +0200618 depends on X86_64 && PCI && AMD_NB
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100619 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100620 Support for full DMA access of devices with 32bit memory access only
621 on systems with more than 3GB. This is usually needed for USB,
622 sound, many IDE/SATA chipsets and some other devices.
623 Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
624 based hardware IOMMU and a software bounce buffer based IOMMU used
625 on Intel systems and as fallback.
626 The code is only active when needed (enough memory and limited
627 device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
628 too.
629
630config CALGARY_IOMMU
631 bool "IBM Calgary IOMMU support"
632 select SWIOTLB
633 depends on X86_64 && PCI && EXPERIMENTAL
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100634 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100635 Support for hardware IOMMUs in IBM's xSeries x366 and x460
636 systems. Needed to run systems with more than 3GB of memory
637 properly with 32-bit PCI devices that do not support DAC
638 (Double Address Cycle). Calgary also supports bus level
639 isolation, where all DMAs pass through the IOMMU. This
640 prevents them from going anywhere except their intended
641 destination. This catches hard-to-find kernel bugs and
642 mis-behaving drivers and devices that do not use the DMA-API
643 properly to set up their DMA buffers. The IOMMU can be
644 turned off at boot time with the iommu=off parameter.
645 Normally the kernel will make the right choice by itself.
646 If unsure, say Y.
647
648config CALGARY_IOMMU_ENABLED_BY_DEFAULT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100649 def_bool y
650 prompt "Should Calgary be enabled by default?"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100651 depends on CALGARY_IOMMU
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100652 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100653 Should Calgary be enabled by default? if you choose 'y', Calgary
654 will be used (if it exists). If you choose 'n', Calgary will not be
655 used even if it exists. If you choose 'n' and would like to use
656 Calgary anyway, pass 'iommu=calgary' on the kernel command line.
657 If unsure, say Y.
658
Joerg Roedel2b188722008-06-26 21:27:37 +0200659config AMD_IOMMU
660 bool "AMD IOMMU support"
Ingo Molnar07c40e82008-06-27 11:31:28 +0200661 select SWIOTLB
Joerg Roedela80dc3e2008-09-11 16:51:41 +0200662 select PCI_MSI
Ingo Molnar24d2ba02008-06-27 10:37:03 +0200663 depends on X86_64 && PCI && ACPI
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100664 ---help---
Joerg Roedel18d22202008-07-03 19:35:06 +0200665 With this option you can enable support for AMD IOMMU hardware in
666 your system. An IOMMU is a hardware component which provides
667 remapping of DMA memory accesses from devices. With an AMD IOMMU you
668 can isolate the the DMA memory of different devices and protect the
669 system from misbehaving device drivers or hardware.
670
671 You can find out if your system has an AMD IOMMU if you look into
672 your BIOS for an option to enable it or if you have an IVRS ACPI
673 table.
Joerg Roedel2b188722008-06-26 21:27:37 +0200674
Joerg Roedel2e117602008-12-11 19:00:12 +0100675config AMD_IOMMU_STATS
676 bool "Export AMD IOMMU statistics to debugfs"
677 depends on AMD_IOMMU
678 select DEBUG_FS
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100679 ---help---
Joerg Roedel2e117602008-12-11 19:00:12 +0100680 This option enables code in the AMD IOMMU driver to collect various
681 statistics about whats happening in the driver and exports that
682 information to userspace via debugfs.
683 If unsure, say N.
684
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100685# need this always selected by IOMMU for the VIA workaround
686config SWIOTLB
Joerg Roedela1afd012008-11-18 12:44:21 +0100687 def_bool y if X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100688 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100689 Support for software bounce buffers used on x86-64 systems
690 which don't have a hardware IOMMU (e.g. the current generation
691 of Intel's x86-64 CPUs). Using this PCI devices which can only
692 access 32-bits of memory can be used on systems with more than
693 3 GB of memory. If unsure, say Y.
694
FUJITA Tomonoria8522502008-04-29 00:59:36 -0700695config IOMMU_HELPER
FUJITA Tomonori18b743d2008-07-10 09:50:50 +0900696 def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU)
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700697
Joerg Roedel1aaf1182008-11-26 17:25:13 +0100698config IOMMU_API
699 def_bool (AMD_IOMMU || DMAR)
700
Mike Travis1184dc22008-05-12 21:21:12 +0200701config MAXSMP
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200702 bool "Enable Maximum number of SMP Processors and NUMA Nodes"
Mike Travis36f51012008-12-16 17:33:51 -0800703 depends on X86_64 && SMP && DEBUG_KERNEL && EXPERIMENTAL
704 select CPUMASK_OFFSTACK
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100705 ---help---
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200706 Enable maximum number of CPUS and NUMA Nodes for this architecture.
Mike Travis1184dc22008-05-12 21:21:12 +0200707 If unsure, say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100708
709config NR_CPUS
Mike Travis36f51012008-12-16 17:33:51 -0800710 int "Maximum number of CPUs" if SMP && !MAXSMP
Michael K. Johnson2a3313f2009-04-21 21:44:48 -0400711 range 2 8 if SMP && X86_32 && !X86_BIGSMP
Mike Travis36f51012008-12-16 17:33:51 -0800712 range 2 512 if SMP && !MAXSMP
Mike Travis78637a972008-12-16 17:34:00 -0800713 default "1" if !SMP
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700714 default "4096" if MAXSMP
Mike Travis78637a972008-12-16 17:34:00 -0800715 default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000)
716 default "8" if SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100717 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100718 This allows you to specify the maximum number of CPUs which this
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700719 kernel will support. The maximum supported value is 512 and the
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100720 minimum value which makes sense is 2.
721
722 This is purely to save memory - each supported CPU adds
723 approximately eight kilobytes to the kernel image.
724
725config SCHED_SMT
726 bool "SMT (Hyperthreading) scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800727 depends on X86_HT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100728 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100729 SMT scheduler support improves the CPU scheduler's decision making
730 when dealing with Intel Pentium 4 chips with HyperThreading at a
731 cost of slightly increased overhead in some places. If unsure say
732 N here.
733
734config SCHED_MC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100735 def_bool y
736 prompt "Multi-core scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800737 depends on X86_HT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100738 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100739 Multi-core scheduler support improves the CPU scheduler's decision
740 making when dealing with multi-core CPU chips at a cost of slightly
741 increased overhead in some places. If unsure say N here.
742
Venkatesh Pallipadie82b8e42010-10-04 17:03:20 -0700743config IRQ_TIME_ACCOUNTING
744 bool "Fine granularity task level IRQ time accounting"
745 default n
746 ---help---
747 Select this option to enable fine granularity task irq time
748 accounting. This is done by reading a timestamp on each
749 transitions between softirq and hardirq state, so there can be a
750 small performance impact.
751
752 If in doubt, say N here.
753
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100754source "kernel/Kconfig.preempt"
755
756config X86_UP_APIC
757 bool "Local APIC support on uniprocessors"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100758 depends on X86_32 && !SMP && !X86_32_NON_STANDARD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100759 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100760 A local APIC (Advanced Programmable Interrupt Controller) is an
761 integrated interrupt controller in the CPU. If you have a single-CPU
762 system which has a processor with a local APIC, you can say Y here to
763 enable and use it. If you say Y here even though your machine doesn't
764 have a local APIC, then the kernel will still run with no slowdown at
765 all. The local APIC supports CPU-generated self-interrupts (timer,
766 performance counters), and the NMI watchdog which detects hard
767 lockups.
768
769config X86_UP_IOAPIC
770 bool "IO-APIC support on uniprocessors"
771 depends on X86_UP_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100772 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100773 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
774 SMP-capable replacement for PC-style interrupt controllers. Most
775 SMP systems and many recent uniprocessor systems have one.
776
777 If you have a single-CPU system with an IO-APIC, you can say Y here
778 to use it. If you say Y here even though your machine doesn't have
779 an IO-APIC, then the kernel will still run with no slowdown at all.
780
781config X86_LOCAL_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100782 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100783 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100784
785config X86_IO_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100786 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100787 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100788
789config X86_VISWS_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100790 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100791 depends on X86_32 && X86_VISWS
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100792
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200793config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
794 bool "Reroute for broken boot IRQs"
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200795 depends on X86_IO_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100796 ---help---
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200797 This option enables a workaround that fixes a source of
798 spurious interrupts. This is recommended when threaded
799 interrupt handling is used on systems where the generation of
800 superfluous "boot interrupts" cannot be disabled.
801
802 Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
803 entry in the chipset's IO-APIC is masked (as, e.g. the RT
804 kernel does during interrupt handling). On chipsets where this
805 boot IRQ generation cannot be disabled, this workaround keeps
806 the original IRQ line masked so that only the equivalent "boot
807 IRQ" is delivered to the CPUs. The workaround also tells the
808 kernel to set up the IRQ handler on the boot IRQ line. In this
809 way only one interrupt is delivered to the kernel. Otherwise
810 the spurious second interrupt may cause the kernel to bring
811 down (vital) interrupt lines.
812
813 Only affects "broken" chipsets. Interrupt sharing may be
814 increased on these systems.
815
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100816config X86_MCE
Andi Kleenbab9bc62009-07-09 00:31:38 +0200817 bool "Machine Check / overheating reporting"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100818 ---help---
Andi Kleenbab9bc62009-07-09 00:31:38 +0200819 Machine Check support allows the processor to notify the
820 kernel if it detects a problem (e.g. overheating, data corruption).
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100821 The action the kernel takes depends on the severity of the problem,
Andi Kleenbab9bc62009-07-09 00:31:38 +0200822 ranging from warning messages to halting the machine.
Andi Kleen4efc0672009-04-28 19:07:31 +0200823
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100824config X86_MCE_INTEL
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100825 def_bool y
826 prompt "Intel MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +0200827 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100828 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100829 Additional support for intel specific MCE features such as
830 the thermal monitor.
831
832config X86_MCE_AMD
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100833 def_bool y
834 prompt "AMD MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +0200835 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100836 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100837 Additional support for AMD specific MCE features such as
838 the DRAM Error Threshold.
839
Andi Kleen4efc0672009-04-28 19:07:31 +0200840config X86_ANCIENT_MCE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100841 bool "Support for old Pentium 5 / WinChip machine checks"
Andi Kleenc31d9632009-07-09 00:31:37 +0200842 depends on X86_32 && X86_MCE
Hidetoshi Setocd13adcc2009-05-27 16:57:31 +0900843 ---help---
844 Include support for machine check handling on old Pentium 5 or WinChip
845 systems. These typically need to be enabled explicitely on the command
846 line.
Andi Kleen4efc0672009-04-28 19:07:31 +0200847
Andi Kleenb2762682009-02-12 13:49:31 +0100848config X86_MCE_THRESHOLD
849 depends on X86_MCE_AMD || X86_MCE_INTEL
Jan Beulich6fc108a2010-04-21 15:23:44 +0100850 def_bool y
Andi Kleenb2762682009-02-12 13:49:31 +0100851
Andi Kleenea149b32009-04-29 19:31:00 +0200852config X86_MCE_INJECT
Andi Kleenc1ebf832009-07-09 00:31:41 +0200853 depends on X86_MCE
Andi Kleenea149b32009-04-29 19:31:00 +0200854 tristate "Machine check injector support"
855 ---help---
856 Provide support for injecting machine checks for testing purposes.
857 If you don't know what a machine check is and you don't do kernel
858 QA it is safe to say n.
859
Andi Kleen4efc0672009-04-28 19:07:31 +0200860config X86_THERMAL_VECTOR
861 def_bool y
Andi Kleen5bb38ad2009-07-09 00:31:39 +0200862 depends on X86_MCE_INTEL
Andi Kleen4efc0672009-04-28 19:07:31 +0200863
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100864config VM86
865 bool "Enable VM86 support" if EMBEDDED
866 default y
867 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100868 ---help---
869 This option is required by programs like DOSEMU to run 16-bit legacy
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100870 code on X86 processors. It also may be needed by software like
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100871 XFree86 to initialize some video cards via BIOS. Disabling this
872 option saves about 6k.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100873
874config TOSHIBA
875 tristate "Toshiba Laptop support"
876 depends on X86_32
877 ---help---
878 This adds a driver to safely access the System Management Mode of
879 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
880 not work on models with a Phoenix BIOS. The System Management Mode
881 is used to set the BIOS and power saving options on Toshiba portables.
882
883 For information on utilities to make use of this driver see the
884 Toshiba Linux utilities web site at:
885 <http://www.buzzard.org.uk/toshiba/>.
886
887 Say Y if you intend to run this kernel on a Toshiba portable.
888 Say N otherwise.
889
890config I8K
891 tristate "Dell laptop support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100892 ---help---
893 This adds a driver to safely access the System Management Mode
894 of the CPU on the Dell Inspiron 8000. The System Management Mode
895 is used to read cpu temperature and cooling fan status and to
896 control the fans on the I8K portables.
897
898 This driver has been tested only on the Inspiron 8000 but it may
899 also work with other Dell laptops. You can force loading on other
900 models by passing the parameter `force=1' to the module. Use at
901 your own risk.
902
903 For information on utilities to make use of this driver see the
904 I8K Linux utilities web site at:
905 <http://people.debian.org/~dz/i8k/>
906
907 Say Y if you intend to run this kernel on a Dell Inspiron 8000.
908 Say N otherwise.
909
910config X86_REBOOTFIXUPS
Jan Beulich9ba16082008-10-15 22:01:38 -0700911 bool "Enable X86 board specific fixups for reboot"
912 depends on X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100913 ---help---
914 This enables chipset and/or board specific fixups to be done
915 in order to get reboot to work correctly. This is only needed on
916 some combinations of hardware and BIOS. The symptom, for which
917 this config is intended, is when reboot ends with a stalled/hung
918 system.
919
920 Currently, the only fixup is for the Geode machines using
Florian Fainelli5e3a77e2008-01-30 13:33:36 +0100921 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100922
923 Say Y if you want to enable the fixup. Currently, it's safe to
924 enable this option even if you don't need it.
925 Say N otherwise.
926
927config MICROCODE
Peter Oruba8d86f392008-07-28 18:44:21 +0200928 tristate "/dev/cpu/microcode - microcode support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100929 select FW_LOADER
930 ---help---
931 If you say Y here, you will be able to update the microcode on
Peter Oruba80cc9f12008-07-28 18:44:22 +0200932 certain Intel and AMD processors. The Intel support is for the
933 IA32 family, e.g. Pentium Pro, Pentium II, Pentium III,
934 Pentium 4, Xeon etc. The AMD support is for family 0x10 and
935 0x11 processors, e.g. Opteron, Phenom and Turion 64 Ultra.
936 You will obviously need the actual microcode binary data itself
937 which is not shipped with the Linux kernel.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100938
Peter Oruba8d86f392008-07-28 18:44:21 +0200939 This option selects the general module only, you need to select
940 at least one vendor specific module as well.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100941
942 To compile this driver as a module, choose M here: the
943 module will be called microcode.
944
Peter Oruba8d86f392008-07-28 18:44:21 +0200945config MICROCODE_INTEL
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100946 bool "Intel microcode patch loading support"
947 depends on MICROCODE
948 default MICROCODE
949 select FW_LOADER
950 ---help---
951 This options enables microcode patch loading support for Intel
952 processors.
Peter Oruba8d86f392008-07-28 18:44:21 +0200953
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100954 For latest news and information on obtaining all the required
955 Intel ingredients for this driver, check:
956 <http://www.urbanmyth.org/microcode/>.
Peter Oruba8d86f392008-07-28 18:44:21 +0200957
Peter Oruba80cc9f12008-07-28 18:44:22 +0200958config MICROCODE_AMD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100959 bool "AMD microcode patch loading support"
960 depends on MICROCODE
961 select FW_LOADER
962 ---help---
963 If you select this option, microcode patch loading support for AMD
964 processors will be enabled.
Peter Oruba80cc9f12008-07-28 18:44:22 +0200965
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100966config MICROCODE_OLD_INTERFACE
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100967 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100968 depends on MICROCODE
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100969
970config X86_MSR
971 tristate "/dev/cpu/*/msr - Model-specific register support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100972 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100973 This device gives privileged processes access to the x86
974 Model-Specific Registers (MSRs). It is a character device with
975 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
976 MSR accesses are directed to a specific CPU on multi-processor
977 systems.
978
979config X86_CPUID
980 tristate "/dev/cpu/*/cpuid - CPU information support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100981 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100982 This device gives processes access to the x86 CPUID instruction to
983 be executed on a specific processor. It is a character device
984 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
985 /dev/cpu/31/cpuid.
986
987choice
988 prompt "High Memory Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100989 default HIGHMEM64G if X86_NUMAQ
Jan Beulich6fc108a2010-04-21 15:23:44 +0100990 default HIGHMEM4G
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100991 depends on X86_32
992
993config NOHIGHMEM
994 bool "off"
995 depends on !X86_NUMAQ
996 ---help---
997 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
998 However, the address space of 32-bit x86 processors is only 4
999 Gigabytes large. That means that, if you have a large amount of
1000 physical memory, not all of it can be "permanently mapped" by the
1001 kernel. The physical memory that's not permanently mapped is called
1002 "high memory".
1003
1004 If you are compiling a kernel which will never run on a machine with
1005 more than 1 Gigabyte total physical RAM, answer "off" here (default
1006 choice and suitable for most users). This will result in a "3GB/1GB"
1007 split: 3GB are mapped so that each process sees a 3GB virtual memory
1008 space and the remaining part of the 4GB virtual memory space is used
1009 by the kernel to permanently map as much physical memory as
1010 possible.
1011
1012 If the machine has between 1 and 4 Gigabytes physical RAM, then
1013 answer "4GB" here.
1014
1015 If more than 4 Gigabytes is used then answer "64GB" here. This
1016 selection turns Intel PAE (Physical Address Extension) mode on.
1017 PAE implements 3-level paging on IA32 processors. PAE is fully
1018 supported by Linux, PAE mode is implemented on all recent Intel
1019 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
1020 then the kernel will not boot on CPUs that don't support PAE!
1021
1022 The actual amount of total physical memory will either be
1023 auto detected or can be forced by using a kernel command line option
1024 such as "mem=256M". (Try "man bootparam" or see the documentation of
1025 your boot loader (lilo or loadlin) about how to pass options to the
1026 kernel at boot time.)
1027
1028 If unsure, say "off".
1029
1030config HIGHMEM4G
1031 bool "4GB"
1032 depends on !X86_NUMAQ
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001033 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001034 Select this if you have a 32-bit processor and between 1 and 4
1035 gigabytes of physical RAM.
1036
1037config HIGHMEM64G
1038 bool "64GB"
1039 depends on !M386 && !M486
1040 select X86_PAE
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001041 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001042 Select this if you have a 32-bit processor and more than 4
1043 gigabytes of physical RAM.
1044
1045endchoice
1046
1047choice
1048 depends on EXPERIMENTAL
1049 prompt "Memory split" if EMBEDDED
1050 default VMSPLIT_3G
1051 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001052 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001053 Select the desired split between kernel and user memory.
1054
1055 If the address range available to the kernel is less than the
1056 physical memory installed, the remaining memory will be available
1057 as "high memory". Accessing high memory is a little more costly
1058 than low memory, as it needs to be mapped into the kernel first.
1059 Note that increasing the kernel address space limits the range
1060 available to user programs, making the address space there
1061 tighter. Selecting anything other than the default 3G/1G split
1062 will also likely make your kernel incompatible with binary-only
1063 kernel modules.
1064
1065 If you are not absolutely sure what you are doing, leave this
1066 option alone!
1067
1068 config VMSPLIT_3G
1069 bool "3G/1G user/kernel split"
1070 config VMSPLIT_3G_OPT
1071 depends on !X86_PAE
1072 bool "3G/1G user/kernel split (for full 1G low memory)"
1073 config VMSPLIT_2G
1074 bool "2G/2G user/kernel split"
1075 config VMSPLIT_2G_OPT
1076 depends on !X86_PAE
1077 bool "2G/2G user/kernel split (for full 2G low memory)"
1078 config VMSPLIT_1G
1079 bool "1G/3G user/kernel split"
1080endchoice
1081
1082config PAGE_OFFSET
1083 hex
1084 default 0xB0000000 if VMSPLIT_3G_OPT
1085 default 0x80000000 if VMSPLIT_2G
1086 default 0x78000000 if VMSPLIT_2G_OPT
1087 default 0x40000000 if VMSPLIT_1G
1088 default 0xC0000000
1089 depends on X86_32
1090
1091config HIGHMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001092 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001093 depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001094
1095config X86_PAE
Jan Beulich9ba16082008-10-15 22:01:38 -07001096 bool "PAE (Physical Address Extension) Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001097 depends on X86_32 && !HIGHMEM4G
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001098 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001099 PAE is required for NX support, and furthermore enables
1100 larger swapspace support for non-overcommit purposes. It
1101 has the cost of more pagetable lookup overhead, and also
1102 consumes more pagetable space per process.
1103
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001104config ARCH_PHYS_ADDR_T_64BIT
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001105 def_bool X86_64 || X86_PAE
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001106
FUJITA Tomonori66f2b062010-10-20 15:55:35 -07001107config ARCH_DMA_ADDR_T_64BIT
1108 def_bool X86_64 || HIGHMEM64G
1109
Nick Piggin9e899812008-10-22 12:33:16 +02001110config DIRECT_GBPAGES
1111 bool "Enable 1GB pages for kernel pagetables" if EMBEDDED
1112 default y
1113 depends on X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001114 ---help---
Nick Piggin9e899812008-10-22 12:33:16 +02001115 Allow the kernel linear mapping to use 1GB pages on CPUs that
1116 support it. This can improve the kernel's performance a tiny bit by
1117 reducing TLB pressure. If in doubt, say "Y".
1118
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001119# Common NUMA Features
1120config NUMA
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001121 bool "Numa Memory Allocation and Scheduler Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001122 depends on SMP
Rafael J. Wysocki604d2052008-11-12 23:26:14 +01001123 depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL)
Yinghai Lu0699eae2008-06-17 15:39:01 -07001124 default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001125 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001126 Enable NUMA (Non Uniform Memory Access) support.
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001127
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001128 The kernel will try to allocate memory used by a CPU on the
1129 local memory controller of the CPU and add some more
1130 NUMA awareness to the kernel.
1131
Ingo Molnarc280ea52008-11-08 13:29:45 +01001132 For 64-bit this is recommended if the system is Intel Core i7
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001133 (or later), AMD Opteron, or EM64T NUMA.
1134
1135 For 32-bit this is only needed on (rare) 32-bit-only platforms
1136 that support NUMA topologies, such as NUMAQ / Summit, or if you
1137 boot a 32-bit kernel on a 64-bit NUMA platform.
1138
1139 Otherwise, you should say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001140
1141comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
1142 depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
1143
1144config K8_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001145 def_bool y
1146 prompt "Old style AMD Opteron NUMA detection"
1147 depends on X86_64 && NUMA && PCI
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001148 ---help---
1149 Enable K8 NUMA node topology detection. You should say Y here if
1150 you have a multi processor AMD K8 system. This uses an old
1151 method to read the NUMA configuration directly from the builtin
1152 Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
1153 instead, which also takes priority if both are compiled in.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001154
1155config X86_64_ACPI_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001156 def_bool y
1157 prompt "ACPI NUMA detection"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001158 depends on X86_64 && NUMA && ACPI && PCI
1159 select ACPI_NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001160 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001161 Enable ACPI SRAT based node topology detection.
1162
Suresh Siddha6ec6e0d2008-03-25 10:14:35 -07001163# Some NUMA nodes have memory ranges that span
1164# other nodes. Even though a pfn is valid and
1165# between a node's start and end pfns, it may not
1166# reside on that node. See memmap_init_zone()
1167# for details.
1168config NODES_SPAN_OTHER_NODES
1169 def_bool y
1170 depends on X86_64_ACPI_NUMA
1171
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001172config NUMA_EMU
1173 bool "NUMA emulation"
1174 depends on X86_64 && NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001175 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001176 Enable NUMA emulation. A flat machine will be split
1177 into virtual nodes when booted with "numa=fake=N", where N is the
1178 number of nodes. This is only useful for debugging.
1179
1180config NODES_SHIFT
Linus Torvaldsd25e26b2008-08-25 14:15:38 -07001181 int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
David Rientjes51591e32010-03-25 15:39:27 -07001182 range 1 10
1183 default "10" if MAXSMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001184 default "6" if X86_64
1185 default "4" if X86_NUMAQ
1186 default "3"
1187 depends on NEED_MULTIPLE_NODES
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001188 ---help---
Mike Travis1184dc22008-05-12 21:21:12 +02001189 Specify the maximum number of NUMA Nodes available on the target
Matt LaPlante692105b2009-01-26 11:12:25 +01001190 system. Increases memory reserved to accommodate various tables.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001191
Tejun Heoc1329372009-02-24 11:57:20 +09001192config HAVE_ARCH_BOOTMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001193 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001194 depends on X86_32 && NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001195
1196config ARCH_HAVE_MEMORY_PRESENT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001197 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001198 depends on X86_32 && DISCONTIGMEM
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001199
1200config NEED_NODE_MEMMAP_SIZE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001201 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001202 depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001203
1204config HAVE_ARCH_ALLOC_REMAP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001205 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001206 depends on X86_32 && NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001207
1208config ARCH_FLATMEM_ENABLE
1209 def_bool y
Jeff Chua99809962008-08-06 19:09:53 +08001210 depends on X86_32 && ARCH_SELECT_MEMORY_MODEL && !NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001211
1212config ARCH_DISCONTIGMEM_ENABLE
1213 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001214 depends on NUMA && X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001215
1216config ARCH_DISCONTIGMEM_DEFAULT
1217 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001218 depends on NUMA && X86_32
1219
KAMEZAWA Hiroyuki94925872009-09-22 16:45:45 -07001220config ARCH_PROC_KCORE_TEXT
1221 def_bool y
1222 depends on X86_64 && PROC_KCORE
1223
Christoph Lameterb2632952008-01-30 13:30:47 +01001224config ARCH_SPARSEMEM_DEFAULT
1225 def_bool y
1226 depends on X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001227
1228config ARCH_SPARSEMEM_ENABLE
1229 def_bool y
Yinghai Lu4272ebf2009-01-29 15:14:46 -08001230 depends on X86_64 || NUMA || (EXPERIMENTAL && X86_32) || X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001231 select SPARSEMEM_STATIC if X86_32
1232 select SPARSEMEM_VMEMMAP_ENABLE if X86_64
1233
1234config ARCH_SELECT_MEMORY_MODEL
1235 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001236 depends on ARCH_SPARSEMEM_ENABLE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001237
1238config ARCH_MEMORY_PROBE
1239 def_bool X86_64
1240 depends on MEMORY_HOTPLUG
1241
Avi Kivitya29815a2010-01-10 16:28:09 +02001242config ILLEGAL_POINTER_VALUE
1243 hex
1244 default 0 if X86_32
1245 default 0xdead000000000000 if X86_64
1246
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001247source "mm/Kconfig"
1248
1249config HIGHPTE
1250 bool "Allocate 3rd-level pagetables from highmem"
Jan Beulich6fc108a2010-04-21 15:23:44 +01001251 depends on HIGHMEM
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001252 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001253 The VM uses one page table entry for each page of physical memory.
1254 For systems with a lot of RAM, this can be wasteful of precious
1255 low memory. Setting this option will put user-space page table
1256 entries in high memory.
1257
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001258config X86_CHECK_BIOS_CORRUPTION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001259 bool "Check for low memory corruption"
1260 ---help---
1261 Periodically check for memory corruption in low memory, which
1262 is suspected to be caused by BIOS. Even when enabled in the
1263 configuration, it is disabled at runtime. Enable it by
1264 setting "memory_corruption_check=1" on the kernel command
1265 line. By default it scans the low 64k of memory every 60
1266 seconds; see the memory_corruption_check_size and
1267 memory_corruption_check_period parameters in
1268 Documentation/kernel-parameters.txt to adjust this.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001269
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001270 When enabled with the default parameters, this option has
1271 almost no overhead, as it reserves a relatively small amount
1272 of memory and scans it infrequently. It both detects corruption
1273 and prevents it from affecting the running system.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001274
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001275 It is, however, intended as a diagnostic tool; if repeatable
1276 BIOS-originated corruption always affects the same memory,
1277 you can use memmap= to prevent the kernel from using that
1278 memory.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001279
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001280config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001281 bool "Set the default setting of memory_corruption_check"
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001282 depends on X86_CHECK_BIOS_CORRUPTION
1283 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001284 ---help---
1285 Set whether the default state of memory_corruption_check is
1286 on or off.
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001287
H. Peter Anvin9ea77bd2010-08-25 16:38:20 -07001288config X86_RESERVE_LOW
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001289 int "Amount of low memory, in kilobytes, to reserve for the BIOS"
1290 default 64
1291 range 4 640
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001292 ---help---
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001293 Specify the amount of low memory to reserve for the BIOS.
Ingo Molnarfc381512008-09-16 10:07:34 +02001294
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001295 The first page contains BIOS data structures that the kernel
1296 must not use, so that page must always be reserved.
Ingo Molnarfc381512008-09-16 10:07:34 +02001297
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001298 By default we reserve the first 64K of physical RAM, as a
1299 number of BIOSes are known to corrupt that memory range
1300 during events such as suspend/resume or monitor cable
1301 insertion, so it must not be used by the kernel.
Ingo Molnarfc381512008-09-16 10:07:34 +02001302
H. Peter Anvind0cd7422010-08-24 17:32:04 -07001303 You can set this to 4 if you are absolutely sure that you
1304 trust the BIOS to get all its memory reservations and usages
1305 right. If you know your BIOS have problems beyond the
1306 default 64K area, you can set this to 640 to avoid using the
1307 entire low memory range.
1308
1309 If you have doubts about the BIOS (e.g. suspend/resume does
1310 not work or there's kernel crashes after certain hardware
1311 hotplug events) then you might want to enable
1312 X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check
1313 typical corruption patterns.
1314
1315 Leave this to the default value of 64 if you are unsure.
Ingo Molnarfc381512008-09-16 10:07:34 +02001316
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001317config MATH_EMULATION
1318 bool
1319 prompt "Math emulation" if X86_32
1320 ---help---
1321 Linux can emulate a math coprocessor (used for floating point
1322 operations) if you don't have one. 486DX and Pentium processors have
1323 a math coprocessor built in, 486SX and 386 do not, unless you added
1324 a 487DX or 387, respectively. (The messages during boot time can
1325 give you some hints here ["man dmesg"].) Everyone needs either a
1326 coprocessor or this emulation.
1327
1328 If you don't have a math coprocessor, you need to say Y here; if you
1329 say Y here even though you have a coprocessor, the coprocessor will
1330 be used nevertheless. (This behavior can be changed with the kernel
1331 command line option "no387", which comes handy if your coprocessor
1332 is broken. Try "man bootparam" or see the documentation of your boot
1333 loader (lilo or loadlin) about how to pass options to the kernel at
1334 boot time.) This means that it is a good idea to say Y here if you
1335 intend to use this kernel on different machines.
1336
1337 More information about the internals of the Linux math coprocessor
1338 emulation can be found in <file:arch/x86/math-emu/README>.
1339
1340 If you are not sure, say Y; apart from resulting in a 66 KB bigger
1341 kernel, it won't hurt.
1342
1343config MTRR
Jan Beulich6fc108a2010-04-21 15:23:44 +01001344 def_bool y
Arjan van de Venc03cb312009-10-11 10:33:02 -07001345 prompt "MTRR (Memory Type Range Register) support" if EMBEDDED
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001346 ---help---
1347 On Intel P6 family processors (Pentium Pro, Pentium II and later)
1348 the Memory Type Range Registers (MTRRs) may be used to control
1349 processor access to memory ranges. This is most useful if you have
1350 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
1351 allows bus write transfers to be combined into a larger transfer
1352 before bursting over the PCI/AGP bus. This can increase performance
1353 of image write operations 2.5 times or more. Saying Y here creates a
1354 /proc/mtrr file which may be used to manipulate your processor's
1355 MTRRs. Typically the X server should use this.
1356
1357 This code has a reasonably generic interface so that similar
1358 control registers on other processors can be easily supported
1359 as well:
1360
1361 The Cyrix 6x86, 6x86MX and M II processors have Address Range
1362 Registers (ARRs) which provide a similar functionality to MTRRs. For
1363 these, the ARRs are used to emulate the MTRRs.
1364 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
1365 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
1366 write-combining. All of these processors are supported by this code
1367 and it makes sense to say Y here if you have one of them.
1368
1369 Saying Y here also fixes a problem with buggy SMP BIOSes which only
1370 set the MTRRs for the boot CPU and not for the secondary CPUs. This
1371 can lead to all sorts of problems, so it's good to say Y here.
1372
1373 You can safely say Y even if your machine doesn't have MTRRs, you'll
1374 just add about 9 KB to your kernel.
1375
Randy Dunlap7225e752008-07-26 17:54:22 -07001376 See <file:Documentation/x86/mtrr.txt> for more information.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001377
Yinghai Lu95ffa242008-04-29 03:52:33 -07001378config MTRR_SANITIZER
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001379 def_bool y
Yinghai Lu95ffa242008-04-29 03:52:33 -07001380 prompt "MTRR cleanup support"
1381 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001382 ---help---
Thomas Gleixneraba37282008-07-15 14:48:48 +02001383 Convert MTRR layout from continuous to discrete, so X drivers can
1384 add writeback entries.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001385
Thomas Gleixneraba37282008-07-15 14:48:48 +02001386 Can be disabled with disable_mtrr_cleanup on the kernel command line.
Matt LaPlante692105b2009-01-26 11:12:25 +01001387 The largest mtrr entry size for a continuous block can be set with
Thomas Gleixneraba37282008-07-15 14:48:48 +02001388 mtrr_chunk_size.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001389
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001390 If unsure, say Y.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001391
1392config MTRR_SANITIZER_ENABLE_DEFAULT
Yinghai Luf5098d62008-04-29 20:25:58 -07001393 int "MTRR cleanup enable value (0-1)"
1394 range 0 1
1395 default "0"
Yinghai Lu95ffa242008-04-29 03:52:33 -07001396 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001397 ---help---
Yinghai Luf5098d62008-04-29 20:25:58 -07001398 Enable mtrr cleanup default value
Yinghai Lu95ffa242008-04-29 03:52:33 -07001399
Yinghai Lu12031a62008-05-02 02:40:22 -07001400config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
1401 int "MTRR cleanup spare reg num (0-7)"
1402 range 0 7
1403 default "1"
1404 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001405 ---help---
Yinghai Lu12031a62008-05-02 02:40:22 -07001406 mtrr cleanup spare entries default, it can be changed via
Thomas Gleixneraba37282008-07-15 14:48:48 +02001407 mtrr_spare_reg_nr=N on the kernel command line.
Yinghai Lu12031a62008-05-02 02:40:22 -07001408
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001409config X86_PAT
Jan Beulich6fc108a2010-04-21 15:23:44 +01001410 def_bool y
Arjan van de Venc03cb312009-10-11 10:33:02 -07001411 prompt "x86 PAT support" if EMBEDDED
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001412 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001413 ---help---
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001414 Use PAT attributes to setup page level cache control.
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001415
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001416 PATs are the modern equivalents of MTRRs and are much more
1417 flexible than MTRRs.
1418
1419 Say N here if you see bootup problems (boot crash, boot hang,
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001420 spontaneous reboots) or a non-working video driver.
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001421
1422 If unsure, say Y.
1423
Venkatesh Pallipadi46cf98c2009-07-10 09:57:37 -07001424config ARCH_USES_PG_UNCACHED
1425 def_bool y
1426 depends on X86_PAT
1427
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001428config EFI
Jan Beulich9ba16082008-10-15 22:01:38 -07001429 bool "EFI runtime service support"
Huang, Ying5b836832008-01-30 13:31:19 +01001430 depends on ACPI
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001431 ---help---
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001432 This enables the kernel to use EFI runtime services that are
1433 available (such as the EFI variable services).
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001434
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001435 This option is only useful on systems that have EFI firmware.
1436 In addition, you should use the latest ELILO loader available
1437 at <http://elilo.sourceforge.net> in order to take advantage
1438 of EFI runtime services. However, even with this option, the
1439 resultant kernel should continue to boot on existing non-EFI
1440 platforms.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001441
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001442config SECCOMP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001443 def_bool y
1444 prompt "Enable seccomp to safely compute untrusted bytecode"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001445 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001446 This kernel feature is useful for number crunching applications
1447 that may need to compute untrusted bytecode during their
1448 execution. By using pipes or other transports made available to
1449 the process as file descriptors supporting the read/write
1450 syscalls, it's possible to isolate those applications in
1451 their own address space using seccomp. Once seccomp is
Alexey Dobriyan9c0bbee2008-09-09 11:01:31 +04001452 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001453 and the task is only allowed to execute a few safe syscalls
1454 defined by each seccomp mode.
1455
1456 If unsure, say Y. Only embedded should say N here.
1457
1458config CC_STACKPROTECTOR
1459 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001460 ---help---
1461 This option turns on the -fstack-protector GCC feature. This
Ingo Molnar113c5412008-02-14 10:36:03 +01001462 feature puts, at the beginning of functions, a canary value on
1463 the stack just before the return address, and validates
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001464 the value just before actually returning. Stack based buffer
1465 overflows (that need to overwrite this return address) now also
1466 overwrite the canary, which gets detected and the attack is then
1467 neutralized via a kernel panic.
1468
1469 This feature requires gcc version 4.2 or above, or a distribution
1470 gcc with the feature backported. Older versions are automatically
Ingo Molnar113c5412008-02-14 10:36:03 +01001471 detected and for those versions, this configuration option is
1472 ignored. (and a warning is printed during bootup)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001473
1474source kernel/Kconfig.hz
1475
1476config KEXEC
1477 bool "kexec system call"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001478 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001479 kexec is a system call that implements the ability to shutdown your
1480 current kernel, and to start another kernel. It is like a reboot
1481 but it is independent of the system firmware. And like a reboot
1482 you can start any kernel with it, not just Linux.
1483
1484 The name comes from the similarity to the exec system call.
1485
1486 It is an ongoing process to be certain the hardware in a machine
1487 is properly shutdown, so do not be surprised if this code does not
1488 initially work for you. It may help to enable device hotplugging
1489 support. As of this writing the exact hardware interface is
1490 strongly in flux, so no good recommendation can be made.
1491
1492config CRASH_DUMP
Pavel Machek04b69442008-08-14 17:16:50 +02001493 bool "kernel crash dumps"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001494 depends on X86_64 || (X86_32 && HIGHMEM)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001495 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001496 Generate crash dump after being started by kexec.
1497 This should be normally only set in special crash dump kernels
1498 which are loaded in the main kernel with kexec-tools into
1499 a specially reserved region and then later executed after
1500 a crash by kdump/kexec. The crash dump kernel must be compiled
1501 to a memory address not used by the main kernel or BIOS using
1502 PHYSICAL_START, or it must be built as a relocatable image
1503 (CONFIG_RELOCATABLE=y).
1504 For more details see Documentation/kdump/kdump.txt
1505
Huang Ying3ab83522008-07-25 19:45:07 -07001506config KEXEC_JUMP
1507 bool "kexec jump (EXPERIMENTAL)"
1508 depends on EXPERIMENTAL
Huang Yingfee7b0d2009-03-10 10:57:16 +08001509 depends on KEXEC && HIBERNATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001510 ---help---
Huang Ying89081d12008-07-25 19:45:10 -07001511 Jump between original kernel and kexeced kernel and invoke
1512 code in physical address mode via KEXEC
Huang Ying3ab83522008-07-25 19:45:07 -07001513
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001514config PHYSICAL_START
1515 hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001516 default "0x1000000"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001517 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001518 This gives the physical address where the kernel is loaded.
1519
1520 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
1521 bzImage will decompress itself to above physical address and
1522 run from there. Otherwise, bzImage will run from the address where
1523 it has been loaded by the boot loader and will ignore above physical
1524 address.
1525
1526 In normal kdump cases one does not have to set/change this option
1527 as now bzImage can be compiled as a completely relocatable image
1528 (CONFIG_RELOCATABLE=y) and be used to load and run from a different
1529 address. This option is mainly useful for the folks who don't want
1530 to use a bzImage for capturing the crash dump and want to use a
1531 vmlinux instead. vmlinux is not relocatable hence a kernel needs
1532 to be specifically compiled to run from a specific memory area
1533 (normally a reserved region) and this option comes handy.
1534
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001535 So if you are using bzImage for capturing the crash dump,
1536 leave the value here unchanged to 0x1000000 and set
1537 CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux
1538 for capturing the crash dump change this value to start of
1539 the reserved region. In other words, it can be set based on
1540 the "X" value as specified in the "crashkernel=YM@XM"
1541 command line boot parameter passed to the panic-ed
1542 kernel. Please take a look at Documentation/kdump/kdump.txt
1543 for more details about crash dumps.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001544
1545 Usage of bzImage for capturing the crash dump is recommended as
1546 one does not have to build two kernels. Same kernel can be used
1547 as production kernel and capture kernel. Above option should have
1548 gone away after relocatable bzImage support is introduced. But it
1549 is present because there are users out there who continue to use
1550 vmlinux for dump capture. This option should go away down the
1551 line.
1552
1553 Don't change this unless you know what you are doing.
1554
1555config RELOCATABLE
H. Peter Anvin26717802009-05-07 14:19:34 -07001556 bool "Build a relocatable kernel"
1557 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001558 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001559 This builds a kernel image that retains relocation information
1560 so it can be loaded someplace besides the default 1MB.
1561 The relocations tend to make the kernel binary about 10% larger,
1562 but are discarded at runtime.
1563
1564 One use is for the kexec on panic case where the recovery kernel
1565 must live at a different physical address than the primary
1566 kernel.
1567
1568 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
1569 it has been loaded at and the compile time physical address
1570 (CONFIG_PHYSICAL_START) is ignored.
1571
H. Peter Anvin845adf72009-05-05 21:20:51 -07001572# Relocation on x86-32 needs some additional build support
1573config X86_NEED_RELOCS
1574 def_bool y
1575 depends on X86_32 && RELOCATABLE
1576
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001577config PHYSICAL_ALIGN
Jan Beulich6fc108a2010-04-21 15:23:44 +01001578 hex "Alignment value to which kernel should be aligned" if X86_32
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001579 default "0x1000000"
1580 range 0x2000 0x1000000
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001581 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001582 This value puts the alignment restrictions on physical address
1583 where kernel is loaded and run from. Kernel is compiled for an
1584 address which meets above alignment restriction.
1585
1586 If bootloader loads the kernel at a non-aligned address and
1587 CONFIG_RELOCATABLE is set, kernel will move itself to nearest
1588 address aligned to above value and run from there.
1589
1590 If bootloader loads the kernel at a non-aligned address and
1591 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
1592 load address and decompress itself to the address it has been
1593 compiled for and run from there. The address for which kernel is
1594 compiled already meets above alignment restrictions. Hence the
1595 end result is that kernel runs from a physical address meeting
1596 above alignment restrictions.
1597
1598 Don't change this unless you know what you are doing.
1599
1600config HOTPLUG_CPU
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001601 bool "Support for hot-pluggable CPUs"
Ingo Molnar4b19ed912009-01-27 17:47:24 +01001602 depends on SMP && HOTPLUG
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001603 ---help---
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001604 Say Y here to allow turning CPUs off and on. CPUs can be
1605 controlled through /sys/devices/system/cpu.
1606 ( Note: power management support will enable this option
1607 automatically on SMP systems. )
1608 Say N if you want to disable CPU hotplug.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001609
1610config COMPAT_VDSO
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001611 def_bool y
1612 prompt "Compat VDSO support"
Roland McGrathaf65d642008-01-30 13:30:43 +01001613 depends on X86_32 || IA32_EMULATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001614 ---help---
Roland McGrathaf65d642008-01-30 13:30:43 +01001615 Map the 32-bit VDSO to the predictable old-style address too.
Randy Dunlape84446d2009-11-10 15:46:52 -08001616
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001617 Say N here if you are running a sufficiently recent glibc
1618 version (2.3.3 or later), to remove the high-mapped
1619 VDSO mapping and to exclusively use the randomized VDSO.
1620
1621 If unsure, say Y.
1622
Tim Bird516cbf32008-08-12 12:52:36 -07001623config CMDLINE_BOOL
1624 bool "Built-in kernel command line"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001625 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001626 Allow for specifying boot arguments to the kernel at
1627 build time. On some systems (e.g. embedded ones), it is
1628 necessary or convenient to provide some or all of the
1629 kernel boot arguments with the kernel itself (that is,
1630 to not rely on the boot loader to provide them.)
1631
1632 To compile command line arguments into the kernel,
1633 set this option to 'Y', then fill in the
1634 the boot arguments in CONFIG_CMDLINE.
1635
1636 Systems with fully functional boot loaders (i.e. non-embedded)
1637 should leave this option set to 'N'.
1638
1639config CMDLINE
1640 string "Built-in kernel command string"
1641 depends on CMDLINE_BOOL
1642 default ""
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001643 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001644 Enter arguments here that should be compiled into the kernel
1645 image and used at boot time. If the boot loader provides a
1646 command line at boot time, it is appended to this string to
1647 form the full kernel command line, when the system boots.
1648
1649 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
1650 change this behavior.
1651
1652 In most cases, the command line (whether built-in or provided
1653 by the boot loader) should specify the device for the root
1654 file system.
1655
1656config CMDLINE_OVERRIDE
1657 bool "Built-in command line overrides boot loader arguments"
Tim Bird516cbf32008-08-12 12:52:36 -07001658 depends on CMDLINE_BOOL
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001659 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001660 Set this option to 'Y' to have the kernel ignore the boot loader
1661 command line, and use ONLY the built-in command line.
1662
1663 This is used to work around broken boot loaders. This should
1664 be set to 'N' under normal conditions.
1665
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001666endmenu
1667
1668config ARCH_ENABLE_MEMORY_HOTPLUG
1669 def_bool y
1670 depends on X86_64 || (X86_32 && HIGHMEM)
1671
Gary Hade35551052008-10-31 10:52:03 -07001672config ARCH_ENABLE_MEMORY_HOTREMOVE
1673 def_bool y
1674 depends on MEMORY_HOTPLUG
1675
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001676config HAVE_ARCH_EARLY_PFN_TO_NID
1677 def_bool X86_64
1678 depends on NUMA
1679
Lee Schermerhorne534c7c2010-05-26 14:44:58 -07001680config USE_PERCPU_NUMA_NODE_ID
1681 def_bool X86_64
1682 depends on NUMA
1683
Bjorn Helgaasda85f862008-11-05 13:37:27 -06001684menu "Power management and ACPI options"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001685
1686config ARCH_HIBERNATION_HEADER
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001687 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001688 depends on X86_64 && HIBERNATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001689
1690source "kernel/power/Kconfig"
1691
1692source "drivers/acpi/Kconfig"
1693
Feng Tangefafc8b2009-08-14 15:23:29 -04001694source "drivers/sfi/Kconfig"
1695
Andi Kleena6b68072008-01-30 13:32:49 +01001696config X86_APM_BOOT
Jan Beulich6fc108a2010-04-21 15:23:44 +01001697 def_bool y
Andi Kleena6b68072008-01-30 13:32:49 +01001698 depends on APM || APM_MODULE
1699
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001700menuconfig APM
1701 tristate "APM (Advanced Power Management) BIOS support"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001702 depends on X86_32 && PM_SLEEP
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001703 ---help---
1704 APM is a BIOS specification for saving power using several different
1705 techniques. This is mostly useful for battery powered laptops with
1706 APM compliant BIOSes. If you say Y here, the system time will be
1707 reset after a RESUME operation, the /proc/apm device will provide
1708 battery status information, and user-space programs will receive
1709 notification of APM "events" (e.g. battery status change).
1710
1711 If you select "Y" here, you can disable actual use of the APM
1712 BIOS by passing the "apm=off" option to the kernel at boot time.
1713
1714 Note that the APM support is almost completely disabled for
1715 machines with more than one CPU.
1716
1717 In order to use APM, you will need supporting software. For location
Randy Dunlap53471122008-03-12 18:10:51 -04001718 and more information, read <file:Documentation/power/pm.txt> and the
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001719 Battery Powered Linux mini-HOWTO, available from
1720 <http://www.tldp.org/docs.html#howto>.
1721
1722 This driver does not spin down disk drives (see the hdparm(8)
1723 manpage ("man 8 hdparm") for that), and it doesn't turn off
1724 VESA-compliant "green" monitors.
1725
1726 This driver does not support the TI 4000M TravelMate and the ACER
1727 486/DX4/75 because they don't have compliant BIOSes. Many "green"
1728 desktop machines also don't have compliant BIOSes, and this driver
1729 may cause those machines to panic during the boot phase.
1730
1731 Generally, if you don't have a battery in your machine, there isn't
1732 much point in using this driver and you should say N. If you get
1733 random kernel OOPSes or reboots that don't seem to be related to
1734 anything, try disabling/enabling this option (or disabling/enabling
1735 APM in your BIOS).
1736
1737 Some other things you should try when experiencing seemingly random,
1738 "weird" problems:
1739
1740 1) make sure that you have enough swap space and that it is
1741 enabled.
1742 2) pass the "no-hlt" option to the kernel
1743 3) switch on floating point emulation in the kernel and pass
1744 the "no387" option to the kernel
1745 4) pass the "floppy=nodma" option to the kernel
1746 5) pass the "mem=4M" option to the kernel (thereby disabling
1747 all but the first 4 MB of RAM)
1748 6) make sure that the CPU is not over clocked.
1749 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
1750 8) disable the cache from your BIOS settings
1751 9) install a fan for the video card or exchange video RAM
1752 10) install a better fan for the CPU
1753 11) exchange RAM chips
1754 12) exchange the motherboard.
1755
1756 To compile this driver as a module, choose M here: the
1757 module will be called apm.
1758
1759if APM
1760
1761config APM_IGNORE_USER_SUSPEND
1762 bool "Ignore USER SUSPEND"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001763 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001764 This option will ignore USER SUSPEND requests. On machines with a
1765 compliant APM BIOS, you want to say N. However, on the NEC Versa M
1766 series notebooks, it is necessary to say Y because of a BIOS bug.
1767
1768config APM_DO_ENABLE
1769 bool "Enable PM at boot time"
1770 ---help---
1771 Enable APM features at boot time. From page 36 of the APM BIOS
1772 specification: "When disabled, the APM BIOS does not automatically
1773 power manage devices, enter the Standby State, enter the Suspend
1774 State, or take power saving steps in response to CPU Idle calls."
1775 This driver will make CPU Idle calls when Linux is idle (unless this
1776 feature is turned off -- see "Do CPU IDLE calls", below). This
1777 should always save battery power, but more complicated APM features
1778 will be dependent on your BIOS implementation. You may need to turn
1779 this option off if your computer hangs at boot time when using APM
1780 support, or if it beeps continuously instead of suspending. Turn
1781 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
1782 T400CDT. This is off by default since most machines do fine without
1783 this feature.
1784
1785config APM_CPU_IDLE
1786 bool "Make CPU Idle calls when idle"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001787 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001788 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
1789 On some machines, this can activate improved power savings, such as
1790 a slowed CPU clock rate, when the machine is idle. These idle calls
1791 are made after the idle loop has run for some length of time (e.g.,
1792 333 mS). On some machines, this will cause a hang at boot time or
1793 whenever the CPU becomes idle. (On machines with more than one CPU,
1794 this option does nothing.)
1795
1796config APM_DISPLAY_BLANK
1797 bool "Enable console blanking using APM"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001798 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001799 Enable console blanking using the APM. Some laptops can use this to
1800 turn off the LCD backlight when the screen blanker of the Linux
1801 virtual console blanks the screen. Note that this is only used by
1802 the virtual console screen blanker, and won't turn off the backlight
1803 when using the X Window system. This also doesn't have anything to
1804 do with your VESA-compliant power-saving monitor. Further, this
1805 option doesn't work for all laptops -- it might not turn off your
1806 backlight at all, or it might print a lot of errors to the console,
1807 especially if you are using gpm.
1808
1809config APM_ALLOW_INTS
1810 bool "Allow interrupts during APM BIOS calls"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001811 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001812 Normally we disable external interrupts while we are making calls to
1813 the APM BIOS as a measure to lessen the effects of a badly behaving
1814 BIOS implementation. The BIOS should reenable interrupts if it
1815 needs to. Unfortunately, some BIOSes do not -- especially those in
1816 many of the newer IBM Thinkpads. If you experience hangs when you
1817 suspend, try setting this to Y. Otherwise, say N.
1818
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001819endif # APM
1820
1821source "arch/x86/kernel/cpu/cpufreq/Kconfig"
1822
1823source "drivers/cpuidle/Kconfig"
1824
Andy Henroid27471fd2008-10-09 11:45:22 -07001825source "drivers/idle/Kconfig"
1826
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001827endmenu
1828
1829
1830menu "Bus options (PCI etc.)"
1831
1832config PCI
Ingo Molnar1ac97012008-05-19 14:10:14 +02001833 bool "PCI support"
Adrian Bunk1c858082008-01-30 13:32:32 +01001834 default y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001835 select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001836 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001837 Find out whether you have a PCI motherboard. PCI is the name of a
1838 bus system, i.e. the way the CPU talks to the other stuff inside
1839 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1840 VESA. If you have PCI, say Y, otherwise N.
1841
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001842choice
1843 prompt "PCI access mode"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001844 depends on X86_32 && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001845 default PCI_GOANY
1846 ---help---
1847 On PCI systems, the BIOS can be used to detect the PCI devices and
1848 determine their configuration. However, some old PCI motherboards
1849 have BIOS bugs and may crash if this is done. Also, some embedded
1850 PCI-based systems don't have any BIOS at all. Linux can also try to
1851 detect the PCI hardware directly without using the BIOS.
1852
1853 With this option, you can specify how Linux should detect the
1854 PCI devices. If you choose "BIOS", the BIOS will be used,
1855 if you choose "Direct", the BIOS won't be used, and if you
1856 choose "MMConfig", then PCI Express MMCONFIG will be used.
1857 If you choose "Any", the kernel will try MMCONFIG, then the
1858 direct access method and falls back to the BIOS if that doesn't
1859 work. If unsure, go with the default, which is "Any".
1860
1861config PCI_GOBIOS
1862 bool "BIOS"
1863
1864config PCI_GOMMCONFIG
1865 bool "MMConfig"
1866
1867config PCI_GODIRECT
1868 bool "Direct"
1869
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001870config PCI_GOOLPC
Daniel Drake76fb6572010-09-23 17:28:04 +01001871 bool "OLPC XO-1"
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001872 depends on OLPC
1873
Andres Salomon2bdd1b02008-06-05 14:14:41 -07001874config PCI_GOANY
1875 bool "Any"
1876
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001877endchoice
1878
1879config PCI_BIOS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001880 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001881 depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001882
1883# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
1884config PCI_DIRECT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001885 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001886 depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001887
1888config PCI_MMCONFIG
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001889 def_bool y
Feng Tang5f0db7a2009-08-14 15:37:50 -04001890 depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001891
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001892config PCI_OLPC
Andres Salomon2bdd1b02008-06-05 14:14:41 -07001893 def_bool y
1894 depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001895
Alex Nixonb5401a92010-03-18 16:31:34 -04001896config PCI_XEN
1897 def_bool y
1898 depends on PCI && XEN
1899 select SWIOTLB_XEN
1900
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001901config PCI_DOMAINS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001902 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001903 depends on PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001904
1905config PCI_MMCONFIG
1906 bool "Support mmconfig PCI config space access"
1907 depends on X86_64 && PCI && ACPI
1908
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07001909config PCI_CNB20LE_QUIRK
1910 bool "Read CNB20LE Host Bridge Windows"
1911 depends on PCI
1912 help
1913 Read the PCI windows out of the CNB20LE host bridge. This allows
1914 PCI hotplug to work on systems with the CNB20LE chipset which do
1915 not have ACPI.
1916
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001917config DMAR
1918 bool "Support for DMA Remapping Devices (EXPERIMENTAL)"
David Woodhouse4cf2e752009-02-11 17:23:43 +00001919 depends on PCI_MSI && ACPI && EXPERIMENTAL
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001920 help
1921 DMA remapping (DMAR) devices support enables independent address
1922 translations for Direct Memory Access (DMA) from devices.
1923 These DMA remapping devices are reported via ACPI tables
1924 and include PCI device scope covered by these DMA
1925 remapping devices.
1926
Kyle McMartin0cd5c3c2009-02-04 14:29:19 -08001927config DMAR_DEFAULT_ON
Kyle McMartinf6be37f2009-02-26 12:57:56 -05001928 def_bool y
Kyle McMartin0cd5c3c2009-02-04 14:29:19 -08001929 prompt "Enable DMA Remapping Devices by default"
1930 depends on DMAR
1931 help
1932 Selecting this option will enable a DMAR device at boot time if
1933 one is found. If this option is not selected, DMAR support can
1934 be enabled by passing intel_iommu=on to the kernel. It is
1935 recommended you say N here while the DMAR code remains
1936 experimental.
1937
David Woodhouse62edf5d2009-07-04 10:59:46 +01001938config DMAR_BROKEN_GFX_WA
Jan Beulich6fc108a2010-04-21 15:23:44 +01001939 bool "Workaround broken graphics drivers (going away soon)"
David Woodhouse0c02a202009-09-19 09:37:23 -07001940 depends on DMAR && BROKEN
David Woodhouse62edf5d2009-07-04 10:59:46 +01001941 ---help---
1942 Current Graphics drivers tend to use physical address
1943 for DMA and avoid using DMA APIs. Setting this config
1944 option permits the IOMMU driver to set a unity map for
1945 all the OS-visible memory. Hence the driver can continue
1946 to use physical addresses for DMA, at least until this
1947 option is removed in the 2.6.32 kernel.
1948
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001949config DMAR_FLOPPY_WA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001950 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001951 depends on DMAR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001952 ---help---
David Woodhousec7ab48d2009-06-26 19:10:36 +01001953 Floppy disk drivers are known to bypass DMA API calls
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001954 thereby failing to work when IOMMU is enabled. This
1955 workaround will setup a 1:1 mapping for the first
David Woodhousec7ab48d2009-06-26 19:10:36 +01001956 16MiB to make floppy (an ISA device) work.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001957
Suresh Siddha9fa8c482008-07-10 11:17:00 -07001958config INTR_REMAP
1959 bool "Support for Interrupt Remapping (EXPERIMENTAL)"
1960 depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI && EXPERIMENTAL
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001961 ---help---
1962 Supports Interrupt remapping for IO-APIC and MSI devices.
1963 To use x2apic mode in the CPU's which support x2APIC enhancements or
1964 to support platforms with CPU's having > 8 bit APIC ID, say Y.
Suresh Siddha9fa8c482008-07-10 11:17:00 -07001965
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001966source "drivers/pci/pcie/Kconfig"
1967
1968source "drivers/pci/Kconfig"
1969
1970# x86_64 have no ISA slots, but do have ISA-style DMA.
1971config ISA_DMA_API
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001972 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001973
1974if X86_32
1975
1976config ISA
1977 bool "ISA support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001978 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001979 Find out whether you have ISA slots on your motherboard. ISA is the
1980 name of a bus system, i.e. the way the CPU talks to the other stuff
1981 inside your box. Other bus systems are PCI, EISA, MicroChannel
1982 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1983 newer boards don't support it. If you have ISA, say Y, otherwise N.
1984
1985config EISA
1986 bool "EISA support"
1987 depends on ISA
1988 ---help---
1989 The Extended Industry Standard Architecture (EISA) bus was
1990 developed as an open alternative to the IBM MicroChannel bus.
1991
1992 The EISA bus provided some of the features of the IBM MicroChannel
1993 bus while maintaining backward compatibility with cards made for
1994 the older ISA bus. The EISA bus saw limited use between 1988 and
1995 1995 when it was made obsolete by the PCI bus.
1996
1997 Say Y here if you are building a kernel for an EISA-based machine.
1998
1999 Otherwise, say N.
2000
2001source "drivers/eisa/Kconfig"
2002
2003config MCA
Ingo Molnar72ee6eb2009-01-27 16:57:49 +01002004 bool "MCA support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002005 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002006 MicroChannel Architecture is found in some IBM PS/2 machines and
2007 laptops. It is a bus system similar to PCI or ISA. See
2008 <file:Documentation/mca.txt> (and especially the web page given
2009 there) before attempting to build an MCA bus kernel.
2010
2011source "drivers/mca/Kconfig"
2012
2013config SCx200
2014 tristate "NatSemi SCx200 support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002015 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002016 This provides basic support for National Semiconductor's
2017 (now AMD's) Geode processors. The driver probes for the
2018 PCI-IDs of several on-chip devices, so its a good dependency
2019 for other scx200_* drivers.
2020
2021 If compiled as a module, the driver is named scx200.
2022
2023config SCx200HR_TIMER
2024 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
John Stultz592913e2010-07-13 17:56:20 -07002025 depends on SCx200
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002026 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002027 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002028 This driver provides a clocksource built upon the on-chip
2029 27MHz high-resolution timer. Its also a workaround for
2030 NSC Geode SC-1100's buggy TSC, which loses time when the
2031 processor goes idle (as is done by the scheduler). The
2032 other workaround is idle=poll boot option.
2033
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002034config OLPC
2035 bool "One Laptop Per Child support"
Andres Salomon3c554942009-12-14 18:00:36 -08002036 select GPIOLIB
Daniel Drake3e3c4862010-09-23 17:28:46 +01002037 select OLPC_OPENFIRMWARE
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002038 ---help---
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002039 Add support for detecting the unique features of the OLPC
2040 XO hardware.
2041
Daniel Drakebf1ebf02010-10-10 10:40:32 +01002042config OLPC_XO1
2043 tristate "OLPC XO-1 support"
Randy Dunlap9e9006e2010-10-14 10:13:13 -07002044 depends on OLPC && PCI
Daniel Drakebf1ebf02010-10-10 10:40:32 +01002045 ---help---
2046 Add support for non-essential features of the OLPC XO-1 laptop.
2047
Andres Salomonfd699c72010-06-18 17:46:53 -04002048config OLPC_OPENFIRMWARE
2049 bool "Support for OLPC's Open Firmware"
2050 depends on !X86_64 && !X86_PAE
Daniel Drake3e3c4862010-09-23 17:28:46 +01002051 default n
Andres Salomonfd699c72010-06-18 17:46:53 -04002052 help
2053 This option adds support for the implementation of Open Firmware
2054 that is used on the OLPC XO-1 Children's Machine.
2055 If unsure, say N here.
2056
Sam Ravnborgbc0120f2007-11-06 23:10:39 +01002057endif # X86_32
2058
Andreas Herrmann23ac4ae2010-09-17 18:03:43 +02002059config AMD_NB
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002060 def_bool y
Borislav Petkov0e152cd2010-03-12 15:43:03 +01002061 depends on CPU_SUP_AMD && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002062
2063source "drivers/pcmcia/Kconfig"
2064
2065source "drivers/pci/hotplug/Kconfig"
2066
2067endmenu
2068
2069
2070menu "Executable file formats / Emulations"
2071
2072source "fs/Kconfig.binfmt"
2073
2074config IA32_EMULATION
2075 bool "IA32 Emulation"
2076 depends on X86_64
Roland McGratha97f52e2008-01-30 13:31:55 +01002077 select COMPAT_BINFMT_ELF
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002078 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002079 Include code to run 32-bit programs under a 64-bit kernel. You should
2080 likely turn this on, unless you're 100% sure that you don't have any
2081 32-bit programs left.
2082
2083config IA32_AOUT
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002084 tristate "IA32 a.out support"
2085 depends on IA32_EMULATION
2086 ---help---
2087 Support old a.out binaries in the 32bit emulation.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002088
2089config COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002090 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002091 depends on IA32_EMULATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002092
2093config COMPAT_FOR_U64_ALIGNMENT
2094 def_bool COMPAT
2095 depends on X86_64
2096
2097config SYSVIPC_COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002098 def_bool y
Alexey Dobriyanb8992192008-09-14 13:44:41 +04002099 depends on COMPAT && SYSVIPC
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002100
2101endmenu
2102
2103
Keith Packarde5beae12008-11-03 18:21:45 +01002104config HAVE_ATOMIC_IOMAP
2105 def_bool y
2106 depends on X86_32
2107
Masami Hiramatsu3cba11d2010-10-14 12:10:42 +09002108config HAVE_TEXT_POKE_SMP
2109 bool
2110 select STOP_MACHINE if SMP
2111
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002112source "net/Kconfig"
2113
2114source "drivers/Kconfig"
2115
2116source "drivers/firmware/Kconfig"
2117
2118source "fs/Kconfig"
2119
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002120source "arch/x86/Kconfig.debug"
2121
2122source "security/Kconfig"
2123
2124source "crypto/Kconfig"
2125
Avi Kivityedf88412007-12-16 11:02:48 +02002126source "arch/x86/kvm/Kconfig"
2127
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002128source "lib/Kconfig"