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Sam Ravnborg1032c0b2007-11-06 21:35:08 +01001# x86 configuration
Sam Ravnborgdaa93fa2007-11-12 20:54:30 +01002mainmenu "Linux Kernel Configuration for x86"
3
4# Select 32 or 64 bit
5config 64BIT
Sam Ravnborg68409992007-11-17 15:37:31 +01006 bool "64-bit kernel" if ARCH = "x86"
7 default ARCH = "x86_64"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01008 ---help---
Sam Ravnborgdaa93fa2007-11-12 20:54:30 +01009 Say yes to build a 64-bit kernel - formerly known as x86_64
10 Say no to build a 32-bit kernel - formerly known as i386
11
12config X86_32
13 def_bool !64BIT
14
15config X86_64
16 def_bool 64BIT
Sam Ravnborg1032c0b2007-11-06 21:35:08 +010017
18### Arch settings
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010019config X86
Harvey Harrison3c2362e2008-01-30 13:31:03 +010020 def_bool y
David Woodhousee17c6d52008-06-17 12:19:34 +010021 select HAVE_AOUT if X86_32
Hitoshi Mitake2c5643b2008-11-30 17:16:04 +090022 select HAVE_READQ
23 select HAVE_WRITEQ
Ingo Molnara5574cf2008-05-05 23:19:50 +020024 select HAVE_UNSTABLE_SCHED_CLOCK
Sam Ravnborgec7748b2008-02-09 10:46:40 +010025 select HAVE_IDE
Mathieu Desnoyers42d4b832008-02-02 15:10:34 -050026 select HAVE_OPROFILE
Ingo Molnarcdd6c482009-09-21 12:02:48 +020027 select HAVE_PERF_EVENTS if (!M386 && !M486)
Rik van Riel28b2ee22008-07-23 21:27:05 -070028 select HAVE_IOREMAP_PROT
Mathieu Desnoyers3f550092008-02-02 15:10:35 -050029 select HAVE_KPROBES
Ingo Molnar1f972762008-07-26 13:52:50 +020030 select ARCH_WANT_OPTIONAL_GPIOLIB
Ingo Molnarda4276b2009-01-07 11:05:10 +010031 select ARCH_WANT_FRAME_POINTERS
FUJITA Tomonori7c095e42009-06-17 16:28:12 -070032 select HAVE_DMA_ATTRS
Ananth N Mavinakayanahalli9edddaa2008-03-04 14:28:37 -080033 select HAVE_KRETPROBES
Masami Hiramatsuc0f7ac32010-02-25 08:34:46 -050034 select HAVE_OPTPROBES
Steven Rostedte4b2b882008-08-14 15:45:11 -040035 select HAVE_FTRACE_MCOUNT_RECORD
Steven Rostedt677aa9f2008-05-17 00:01:36 -040036 select HAVE_DYNAMIC_FTRACE
Steven Rostedt606576c2008-10-06 19:06:12 -040037 select HAVE_FUNCTION_TRACER
Frederic Weisbecker48d68b22008-12-02 00:20:39 +010038 select HAVE_FUNCTION_GRAPH_TRACER
Steven Rostedt71e308a2009-06-18 12:45:08 -040039 select HAVE_FUNCTION_GRAPH_FP_TEST
Steven Rostedt60a7ecf2008-11-05 16:05:44 -050040 select HAVE_FUNCTION_TRACE_MCOUNT_TEST
Steven Rostedt9a5fd902009-02-06 01:14:26 -050041 select HAVE_FTRACE_NMI_ENTER if DYNAMIC_FTRACE
Josh Stone66700002009-08-24 14:43:11 -070042 select HAVE_SYSCALL_TRACEPOINTS
Ingo Molnare0ec9482009-01-27 17:01:14 +010043 select HAVE_KVM
Ingo Molnar49793b02009-01-27 17:02:29 +010044 select HAVE_ARCH_KGDB
Roland McGrath99bbc4b2008-04-20 14:35:12 -070045 select HAVE_ARCH_TRACEHOOK
Dmitry Baryshkov323ec002008-06-29 14:19:31 +040046 select HAVE_GENERIC_DMA_COHERENT if X86_32
Johannes Berg58340a02008-07-25 01:45:33 -070047 select HAVE_EFFICIENT_UNALIGNED_ACCESS
Török Edwin8d264872008-11-23 12:39:08 +020048 select USER_STACKTRACE_SUPPORT
Heiko Carstensf850c302010-02-10 17:25:17 +010049 select HAVE_REGS_AND_STACK_ACCESS_API
Joerg Roedel2118d0c2009-01-09 15:13:15 +010050 select HAVE_DMA_API_DEBUG
H. Peter Anvin2e9f3bd2009-01-04 15:41:25 -080051 select HAVE_KERNEL_GZIP
52 select HAVE_KERNEL_BZIP2
53 select HAVE_KERNEL_LZMA
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 Weisbecker99e8c5a2009-12-17 01:33:54 +010056 select PERF_EVENTS
57 select ANON_INODES
Pekka Enberg0a4af3b2009-02-26 21:38:56 +020058 select HAVE_ARCH_KMEMCHECK
Avi Kivity7c68af62009-09-19 09:40:22 +030059 select HAVE_USER_RETURN_NOTIFIER
Balbir Singh7d8330a2008-02-10 12:46:28 +053060
Linus Torvalds51b26ad2009-04-26 10:12:47 -070061config OUTPUT_FORMAT
62 string
63 default "elf32-i386" if X86_32
64 default "elf64-x86-64" if X86_64
65
Sam Ravnborg73531902008-05-25 23:03:18 +020066config ARCH_DEFCONFIG
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +020067 string
Sam Ravnborg73531902008-05-25 23:03:18 +020068 default "arch/x86/configs/i386_defconfig" if X86_32
69 default "arch/x86/configs/x86_64_defconfig" if X86_64
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +020070
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010071config GENERIC_TIME
Harvey Harrison3c2362e2008-01-30 13:31:03 +010072 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010073
74config GENERIC_CMOS_UPDATE
Harvey Harrison3c2362e2008-01-30 13:31:03 +010075 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010076
77config CLOCKSOURCE_WATCHDOG
Harvey Harrison3c2362e2008-01-30 13:31:03 +010078 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010079
80config GENERIC_CLOCKEVENTS
Harvey Harrison3c2362e2008-01-30 13:31:03 +010081 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010082
83config GENERIC_CLOCKEVENTS_BROADCAST
Harvey Harrison3c2362e2008-01-30 13:31:03 +010084 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010085 depends on X86_64 || (X86_32 && X86_LOCAL_APIC)
86
87config LOCKDEP_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +010088 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010089
90config STACKTRACE_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +010091 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010092
Heiko Carstensaa7d9352008-02-01 17:45:14 +010093config HAVE_LATENCYTOP_SUPPORT
94 def_bool y
95
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010096config MMU
Harvey Harrison3c2362e2008-01-30 13:31:03 +010097 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010098
99config ZONE_DMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100100 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100101
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100102config SBUS
103 bool
104
FUJITA Tomonori3bc4e452010-03-10 15:23:22 -0800105config NEED_DMA_MAP_STATE
106 def_bool (X86_64 || DMAR || DMA_API_DEBUG)
107
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100108config GENERIC_ISA_DMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100109 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100110
111config GENERIC_IOMAP
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100112 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100113
114config GENERIC_BUG
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100115 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100116 depends on BUG
Jan Beulichb93a5312008-12-16 11:40:27 +0000117 select GENERIC_BUG_RELATIVE_POINTERS if X86_64
118
119config GENERIC_BUG_RELATIVE_POINTERS
120 bool
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100121
122config GENERIC_HWEIGHT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100123 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100124
Florian Fainellia6082952008-01-30 13:33:35 +0100125config GENERIC_GPIO
Jan Beulich9ba16082008-10-15 22:01:38 -0700126 bool
Florian Fainellia6082952008-01-30 13:33:35 +0100127
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100128config ARCH_MAY_HAVE_PC_FDC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100129 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100130
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100131config RWSEM_GENERIC_SPINLOCK
132 def_bool !X86_XADD
133
134config RWSEM_XCHGADD_ALGORITHM
135 def_bool X86_XADD
136
Venki Pallipadia6869cc2008-02-08 17:05:44 -0800137config ARCH_HAS_CPU_IDLE_WAIT
138 def_bool y
139
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100140config GENERIC_CALIBRATE_DELAY
141 def_bool y
142
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100143config GENERIC_TIME_VSYSCALL
144 bool
145 default X86_64
146
venkatesh.pallipadi@intel.com9a0b8412008-01-31 17:35:06 -0800147config ARCH_HAS_CPU_RELAX
148 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100149
Venkatesh Pallipadi89cedfe2008-10-16 19:00:08 -0400150config ARCH_HAS_DEFAULT_IDLE
151 def_bool y
152
Pekka Enberg1b27d052008-04-28 02:12:22 -0700153config ARCH_HAS_CACHE_LINE_SIZE
154 def_bool y
155
Mike Travisdd5af902008-01-30 13:33:32 +0100156config HAVE_SETUP_PER_CPU_AREA
Brian Gerst89c9c4c2009-01-27 12:56:48 +0900157 def_bool y
travis@sgi.comb32ef632008-01-30 13:32:51 +0100158
Tejun Heo08fc4582009-08-14 15:00:49 +0900159config NEED_PER_CPU_EMBED_FIRST_CHUNK
160 def_bool y
161
162config NEED_PER_CPU_PAGE_FIRST_CHUNK
Tejun Heo11124412009-02-20 16:29:09 +0900163 def_bool y
164
Mike Travis9f0e8d02008-04-04 18:11:01 -0700165config HAVE_CPUMASK_OF_CPU_MAP
166 def_bool X86_64_SMP
167
Johannes Berg801e4062007-12-08 02:12:39 +0100168config ARCH_HIBERNATION_POSSIBLE
169 def_bool y
Johannes Berg801e4062007-12-08 02:12:39 +0100170
Johannes Bergf4cb5702007-12-08 02:14:00 +0100171config ARCH_SUSPEND_POSSIBLE
172 def_bool y
Johannes Bergf4cb5702007-12-08 02:14:00 +0100173
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100174config ZONE_DMA32
175 bool
176 default X86_64
177
178config ARCH_POPULATES_NODE_MAP
179 def_bool y
180
181config AUDIT_ARCH
182 bool
183 default X86_64
184
Ingo Molnar765c68b2008-04-09 11:03:37 +0200185config ARCH_SUPPORTS_OPTIMIZED_INLINING
186 def_bool y
187
Akinobu Mita6a11f752009-03-31 15:23:17 -0700188config ARCH_SUPPORTS_DEBUG_PAGEALLOC
189 def_bool y
190
Yinghai Lu580e0ad2010-02-16 18:40:35 -0800191config HAVE_EARLY_RES
192 def_bool y
193
Shane Wang69575d32009-09-01 18:25:07 -0700194config HAVE_INTEL_TXT
195 def_bool y
196 depends on EXPERIMENTAL && DMAR && ACPI
197
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100198# Use the generic interrupt handling code in kernel/irq/:
199config GENERIC_HARDIRQS
200 bool
201 default y
202
Thomas Gleixnerf9a36fa2009-03-13 16:37:48 +0100203config GENERIC_HARDIRQS_NO__DO_IRQ
204 def_bool y
205
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100206config GENERIC_IRQ_PROBE
207 bool
208 default y
209
210config GENERIC_PENDING_IRQ
211 bool
212 depends on GENERIC_HARDIRQS && SMP
213 default y
214
James Bottomley6cd10f82008-11-09 11:53:14 -0600215config USE_GENERIC_SMP_HELPERS
216 def_bool y
217 depends on SMP
218
Sam Ravnborg6b0c3d42008-01-30 13:32:27 +0100219config X86_32_SMP
220 def_bool y
221 depends on X86_32 && SMP
222
223config X86_64_SMP
224 def_bool y
225 depends on X86_64 && SMP
226
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100227config X86_HT
228 bool
Adrian Bunkee0011a2007-12-04 17:19:07 +0100229 depends on SMP
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100230 default y
231
232config X86_TRAMPOLINE
233 bool
Ingo Molnar3e5095d2009-01-27 17:07:08 +0100234 depends on SMP || (64BIT && ACPI_SLEEP)
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100235 default y
236
Tejun Heoccbeed32009-02-09 22:17:40 +0900237config X86_32_LAZY_GS
238 def_bool y
Tejun Heo60a53172009-02-09 22:17:40 +0900239 depends on X86_32 && !CC_STACKPROTECTOR
Tejun Heoccbeed32009-02-09 22:17:40 +0900240
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100241config KTIME_SCALAR
242 def_bool X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100243source "init/Kconfig"
Matt Helsleydc52ddc2008-10-18 20:27:21 -0700244source "kernel/Kconfig.freezer"
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100245
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100246menu "Processor type and features"
247
248source "kernel/time/Kconfig"
249
250config SMP
251 bool "Symmetric multi-processing support"
252 ---help---
253 This enables support for systems with more than one CPU. If you have
254 a system with only one CPU, like most personal computers, say N. If
255 you have a system with more than one CPU, say Y.
256
257 If you say N here, the kernel will run on single and multiprocessor
258 machines, but will use only one CPU of a multiprocessor machine. If
259 you say Y here, the kernel will run on many, but not all,
260 singleprocessor machines. On a singleprocessor machine, the kernel
261 will run faster if you say N here.
262
263 Note that if you say Y here and choose architecture "586" or
264 "Pentium" under "Processor family", the kernel will not work on 486
265 architectures. Similarly, multiprocessor kernels for the "PPro"
266 architecture may not work on all Pentium based boards.
267
268 People using multiprocessor machines who say Y here should also say
269 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
270 Management" code will be disabled if you say Y here.
271
Adrian Bunk03502fa2008-02-03 15:50:21 +0200272 See also <file:Documentation/i386/IO-APIC.txt>,
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100273 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
274 <http://www.tldp.org/docs.html#howto>.
275
276 If you don't know what to do here, say N.
277
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800278config X86_X2APIC
279 bool "Support x2apic"
David Woodhousef7d7f862009-04-06 23:04:40 -0700280 depends on X86_LOCAL_APIC && X86_64 && INTR_REMAP
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800281 ---help---
282 This enables x2apic support on CPUs that have this feature.
283
284 This allows 32-bit apic IDs (so it can support very large systems),
285 and accesses the local apic via MSRs not via mmio.
286
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800287 If you don't know what to do here, say N.
288
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800289config SPARSE_IRQ
290 bool "Support sparse irq numbering"
Yinghai Lu17483a12008-12-12 13:14:18 -0800291 depends on PCI_MSI || HT_IRQ
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100292 ---help---
Ingo Molnar973656f2008-12-25 16:26:47 +0100293 This enables support for sparse irqs. This is useful for distro
294 kernels that want to define a high CONFIG_NR_CPUS value but still
295 want to have low kernel memory footprint on smaller machines.
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800296
Ingo Molnar973656f2008-12-25 16:26:47 +0100297 ( Sparse IRQs can also be beneficial on NUMA boxes, as they spread
298 out the irq_desc[] array in a more NUMA-friendly way. )
299
300 If you don't know what to do here, say N.
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800301
Yinghai Lu15e957d2009-04-30 01:17:50 -0700302config NUMA_IRQ_DESC
303 def_bool y
Yinghai Lub9098952008-12-19 13:48:34 -0800304 depends on SPARSE_IRQ && NUMA
Yinghai Lu48a1b102008-12-11 00:15:01 -0800305
Yinghai Lu6695c852008-06-19 12:13:09 -0700306config X86_MPPARSE
Jan Beulich7a527682008-10-30 10:38:24 +0000307 bool "Enable MPS table" if ACPI
308 default y
Ingo Molnar5ab74722008-07-10 14:42:03 +0200309 depends on X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100310 ---help---
Yinghai Lu6695c852008-06-19 12:13:09 -0700311 For old smp systems that do not have proper acpi support. Newer systems
312 (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
Yinghai Lu6695c852008-06-19 12:13:09 -0700313
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800314config X86_BIGSMP
315 bool "Support for big SMP systems with more than 8 CPUs"
316 depends on X86_32 && SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100317 ---help---
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800318 This option is needed for the systems that have more than 8 CPUs
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100319
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800320if X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800321config X86_EXTENDED_PLATFORM
322 bool "Support for extended (non-PC) x86 platforms"
323 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100324 ---help---
Ingo Molnar06ac8342009-01-27 18:11:43 +0100325 If you disable this option then the kernel will only support
326 standard PC platforms. (which covers the vast majority of
327 systems out there.)
328
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800329 If you enable this option then you'll be able to select support
330 for the following (non-PC) 32 bit x86 platforms:
331 AMD Elan
332 NUMAQ (IBM/Sequent)
333 RDC R-321x SoC
334 SGI 320/540 (Visual Workstation)
335 Summit/EXA (IBM x440)
336 Unisys ES7000 IA32 series
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200337 Moorestown MID devices
Ingo Molnar06ac8342009-01-27 18:11:43 +0100338
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.
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800341endif
Ingo Molnar06ac8342009-01-27 18:11:43 +0100342
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800343if X86_64
344config X86_EXTENDED_PLATFORM
345 bool "Support for extended (non-PC) x86 platforms"
346 default y
347 ---help---
348 If you disable this option then the kernel will only support
349 standard PC platforms. (which covers the vast majority of
350 systems out there.)
351
352 If you enable this option then you'll be able to select support
353 for the following (non-PC) 64 bit x86 platforms:
354 ScaleMP vSMP
355 SGI Ultraviolet
356
357 If you have one of these systems, or if you want to build a
358 generic distribution kernel, say Y here - otherwise say N.
359endif
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800360# This is an alphabetically sorted list of 64 bit extended platforms
361# Please maintain the alphabetic order if and when there are additions
Nick Piggin03b48632009-01-20 04:36:04 +0100362
Ingo Molnar6a485652009-01-27 18:29:13 +0100363config X86_VSMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800364 bool "ScaleMP vSMP"
Ingo Molnar6a485652009-01-27 18:29:13 +0100365 select PARAVIRT
366 depends on X86_64 && PCI
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800367 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100368 ---help---
Ingo Molnar6a485652009-01-27 18:29:13 +0100369 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
370 supposed to run on these EM64T-based machines. Only choose this option
371 if you have one of these machines.
372
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800373config X86_UV
374 bool "SGI Ultraviolet"
375 depends on X86_64
376 depends on X86_EXTENDED_PLATFORM
Jack Steiner54c28d22009-04-03 15:39:42 -0500377 depends on NUMA
Suresh Siddha9d6c26e2009-04-20 13:02:31 -0700378 depends on X86_X2APIC
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800379 ---help---
380 This option is needed in order to support SGI Ultraviolet systems.
381 If you don't have one of these, you should say N here.
382
383# Following is an alphabetically sorted list of 32 bit extended platforms
384# Please maintain the alphabetic order if and when there are additions
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100385
386config X86_ELAN
387 bool "AMD Elan"
388 depends on X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800389 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100390 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100391 Select this for an AMD Elan processor.
392
393 Do not use this option for K6/Athlon/Opteron processors!
394
395 If unsure, choose "PC-compatible" instead.
396
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200397config X86_MRST
398 bool "Moorestown MID platform"
Jacob Pan4b2f3f72010-02-25 10:02:14 -0800399 depends on PCI
400 depends on PCI_GOANY
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200401 depends on X86_32
402 depends on X86_EXTENDED_PLATFORM
Jacob Pan4b2f3f72010-02-25 10:02:14 -0800403 depends on X86_IO_APIC
Jacob Panbb24c472009-09-02 07:37:17 -0700404 select APB_TIMER
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200405 ---help---
406 Moorestown is Intel's Low Power Intel Architecture (LPIA) based Moblin
407 Internet Device(MID) platform. Moorestown consists of two chips:
408 Lincroft (CPU core, graphics, and memory controller) and Langwell IOH.
409 Unlike standard x86 PCs, Moorestown does not have many legacy devices
410 nor standard legacy replacement devices/features. e.g. Moorestown does
411 not contain i8259, i8254, HPET, legacy BIOS, most of the io ports.
412
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800413config X86_RDC321X
414 bool "RDC R-321x SoC"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100415 depends on X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800416 depends on X86_EXTENDED_PLATFORM
417 select M486
418 select X86_REBOOTFIXUPS
419 ---help---
420 This option is needed for RDC R-321x system-on-chip, also known
421 as R-8610-(G).
422 If you don't have one of these chips, you should say N here.
423
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100424config X86_32_NON_STANDARD
Ingo Molnar9c398012009-01-27 18:24:57 +0100425 bool "Support non-standard 32-bit SMP architectures"
426 depends on X86_32 && SMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800427 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100428 ---help---
429 This option compiles in the NUMAQ, Summit, bigsmp, ES7000, default
Yinghai Lud49c4282008-06-08 18:31:54 -0700430 subarchitectures. It is intended for a generic binary kernel.
431 if you select them all, kernel will probe it one by one. and will
432 fallback to default.
433
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800434# Alphabetically sorted list of Non standard 32 bit platforms
Yinghai Lud49c4282008-06-08 18:31:54 -0700435
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100436config X86_NUMAQ
437 bool "NUMAQ (IBM/Sequent)"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100438 depends on X86_32_NON_STANDARD
Pan, Jacob juna92d1522010-02-24 16:59:55 -0800439 depends on PCI
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100440 select NUMA
Ingo Molnar9c398012009-01-27 18:24:57 +0100441 select X86_MPPARSE
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100442 ---help---
Yinghai Lud49c4282008-06-08 18:31:54 -0700443 This option is used for getting Linux to run on a NUMAQ (IBM/Sequent)
444 NUMA multiquad box. This changes the way that processors are
445 bootstrapped, and uses Clustered Logical APIC addressing mode instead
446 of Flat Logical. You will need a new lynxer.elf file to flash your
447 firmware with - send email to <Martin.Bligh@us.ibm.com>.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100448
Linus Torvaldsd949f362009-09-26 09:35:07 -0700449config X86_SUPPORTS_MEMORY_FAILURE
450 bool
451 # MCE code calls memory_failure():
452 depends on X86_MCE
453 # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
454 depends on !X86_NUMAQ
455 # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
456 depends on X86_64 || !SPARSEMEM
457 select ARCH_SUPPORTS_MEMORY_FAILURE
458 default y
459
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200460config X86_VISWS
461 bool "SGI 320/540 (Visual Workstation)"
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800462 depends on X86_32 && PCI && X86_MPPARSE && PCI_GODIRECT
463 depends on X86_32_NON_STANDARD
464 ---help---
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200465 The SGI Visual Workstation series is an IA32-based workstation
466 based on SGI systems chips with some legacy PC hardware attached.
467
468 Say Y here to create a kernel to run on the SGI 320 or 540.
469
470 A kernel compiled for the Visual Workstation will run on general
471 PCs as well. See <file:Documentation/sgi-visws.txt> for details.
472
Ingo Molnar9c398012009-01-27 18:24:57 +0100473config X86_SUMMIT
474 bool "Summit/EXA (IBM x440)"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100475 depends on X86_32_NON_STANDARD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100476 ---help---
Ingo Molnar9c398012009-01-27 18:24:57 +0100477 This option is needed for IBM systems that use the Summit/EXA chipset.
478 In particular, it is needed for the x440.
Ingo Molnar1f972762008-07-26 13:52:50 +0200479
Ingo Molnar9c398012009-01-27 18:24:57 +0100480config X86_ES7000
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800481 bool "Unisys ES7000 IA32 series"
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800482 depends on X86_32_NON_STANDARD && X86_BIGSMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100483 ---help---
Ingo Molnar9c398012009-01-27 18:24:57 +0100484 Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
485 supposed to run on an IA32-based Unisys ES7000 system.
486
Ingo Molnarae1e9132008-11-11 09:05:16 +0100487config SCHED_OMIT_FRAME_POINTER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100488 def_bool y
489 prompt "Single-depth WCHAN output"
Ken Chena87d0912008-11-06 11:10:49 -0800490 depends on X86
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100491 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100492 Calculate simpler /proc/<PID>/wchan values. If this option
493 is disabled then wchan values will recurse back to the
494 caller function. This provides more accurate wchan values,
495 at the expense of slightly more scheduling overhead.
496
497 If in doubt, say "Y".
498
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100499menuconfig PARAVIRT_GUEST
500 bool "Paravirtualized guest support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100501 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100502 Say Y here to get to see options related to running Linux under
503 various hypervisors. This option alone does not add any kernel code.
504
505 If you say N, all options in this submenu will be skipped and disabled.
506
507if PARAVIRT_GUEST
508
509source "arch/x86/xen/Kconfig"
510
511config VMI
Alok Katariad0153ca2009-09-29 10:25:24 -0700512 bool "VMI Guest support (DEPRECATED)"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100513 select PARAVIRT
Eduardo Pereira Habkost42d545c2008-01-30 13:33:32 +0100514 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100515 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100516 VMI provides a paravirtualized interface to the VMware ESX server
517 (it could be used by other hypervisors in theory too, but is not
518 at the moment), by linking the kernel to a GPL-ed ROM module
519 provided by the hypervisor.
520
Alok Katariad0153ca2009-09-29 10:25:24 -0700521 As of September 2009, VMware has started a phased retirement
522 of this feature from VMware's products. Please see
523 feature-removal-schedule.txt for details. If you are
524 planning to enable this option, please note that you cannot
525 live migrate a VMI enabled VM to a future VMware product,
526 which doesn't support VMI. So if you expect your kernel to
527 seamlessly migrate to newer VMware products, keep this
528 disabled.
529
Glauber de Oliveira Costa790c73f2008-02-15 17:52:48 -0200530config KVM_CLOCK
531 bool "KVM paravirtualized clock"
532 select PARAVIRT
Gerd Hoffmannf6e16d52008-06-03 16:17:32 +0200533 select PARAVIRT_CLOCK
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100534 ---help---
Glauber de Oliveira Costa790c73f2008-02-15 17:52:48 -0200535 Turning on this option will allow you to run a paravirtualized clock
536 when running over the KVM hypervisor. Instead of relying on a PIT
537 (or probably other) emulation by the underlying device model, the host
538 provides the guest with timing infrastructure such as time of day, and
539 system time
540
Marcelo Tosatti0cf1bfd2008-02-22 12:21:36 -0500541config KVM_GUEST
542 bool "KVM Guest support"
543 select PARAVIRT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100544 ---help---
545 This option enables various optimizations for running under the KVM
546 hypervisor.
Marcelo Tosatti0cf1bfd2008-02-22 12:21:36 -0500547
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100548source "arch/x86/lguest/Kconfig"
549
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100550config PARAVIRT
551 bool "Enable paravirtualization code"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100552 ---help---
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100553 This changes the kernel so it can modify itself when it is run
554 under a hypervisor, potentially improving performance significantly
555 over full virtualization. However, when run without a hypervisor
556 the kernel is theoretically slower and slightly larger.
557
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700558config PARAVIRT_SPINLOCKS
559 bool "Paravirtualization layer for spinlocks"
560 depends on PARAVIRT && SMP && EXPERIMENTAL
561 ---help---
562 Paravirtualized spinlocks allow a pvops backend to replace the
563 spinlock implementation with something virtualization-friendly
564 (for example, block the virtual CPU rather than spinning).
565
566 Unfortunately the downside is an up to 5% performance hit on
567 native kernels, with various workloads.
568
569 If you are unsure how to answer this question, answer N.
570
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200571config PARAVIRT_CLOCK
572 bool
573 default n
574
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100575endif
576
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400577config PARAVIRT_DEBUG
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100578 bool "paravirt-ops debugging"
579 depends on PARAVIRT && DEBUG_KERNEL
580 ---help---
581 Enable to debug paravirt_ops internals. Specifically, BUG if
582 a paravirt_op is missing when it is called.
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400583
Yinghai Lu08677212010-02-10 01:20:20 -0800584config NO_BOOTMEM
585 default y
586 bool "Disable Bootmem code"
Yinghai Lu08677212010-02-10 01:20:20 -0800587 ---help---
588 Use early_res directly instead of bootmem before slab is ready.
589 - allocator (buddy) [generic]
590 - early allocator (bootmem) [generic]
591 - very early allocator (reserve_early*()) [x86]
592 - very very early allocator (early brk model) [x86]
593 So reduce one layer between early allocator to final allocator
594
595
Yinghai Lu03273182008-04-18 17:49:15 -0700596config MEMTEST
597 bool "Memtest"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100598 ---help---
Yinghai Luc64df702008-03-21 18:56:19 -0700599 This option adds a kernel parameter 'memtest', which allows memtest
Yinghai Lu03273182008-04-18 17:49:15 -0700600 to be set.
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100601 memtest=0, mean disabled; -- default
602 memtest=1, mean do 1 test pattern;
603 ...
604 memtest=4, mean do 4 test patterns.
Thomas Gleixneraba37282008-07-15 14:48:48 +0200605 If you are unsure how to answer this question, answer N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100606
607config X86_SUMMIT_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100608 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100609 depends on X86_32 && NUMA && X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100610
611config X86_CYCLONE_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100612 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100613 depends on X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100614
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100615source "arch/x86/Kconfig.cpu"
616
617config HPET_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100618 def_bool X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100619 prompt "HPET Timer Support" if X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100620 ---help---
621 Use the IA-PC HPET (High Precision Event Timer) to manage
622 time in preference to the PIT and RTC, if a HPET is
623 present.
624 HPET is the next generation timer replacing legacy 8254s.
625 The HPET provides a stable time base on SMP
626 systems, unlike the TSC, but it is more expensive to access,
627 as it is off-chip. You can find the HPET spec at
628 <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100629
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100630 You can safely choose Y here. However, HPET will only be
631 activated if the platform and the BIOS support this feature.
632 Otherwise the 8254 will be used for timing services.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100633
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100634 Choose N to continue using the legacy 8254 timer.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100635
636config HPET_EMULATE_RTC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100637 def_bool y
Bernhard Walle9d8af782008-02-06 01:38:52 -0800638 depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100639
Jacob Panbb24c472009-09-02 07:37:17 -0700640config APB_TIMER
641 def_bool y if MRST
642 prompt "Langwell APB Timer Support" if X86_MRST
643 help
644 APB timer is the replacement for 8254, HPET on X86 MID platforms.
645 The APBT provides a stable time base on SMP
646 systems, unlike the TSC, but it is more expensive to access,
647 as it is off-chip. APB timers are always running regardless of CPU
648 C states, they are used as per CPU clockevent device when possible.
649
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100650# Mark as embedded because too many people got it wrong.
651# The code disables itself when not needed.
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700652config DMI
653 default y
654 bool "Enable DMI scanning" if EMBEDDED
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100655 ---help---
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700656 Enabled scanning of DMI to identify machine quirks. Say Y
657 here unless you have verified that your setup is not
658 affected by entries in the DMI blacklist. Required by PNP
659 BIOS code.
660
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100661config GART_IOMMU
662 bool "GART IOMMU support" if EMBEDDED
663 default y
664 select SWIOTLB
Borislav Petkov0e152cd2010-03-12 15:43:03 +0100665 depends on X86_64 && PCI && K8_NB
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100666 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100667 Support for full DMA access of devices with 32bit memory access only
668 on systems with more than 3GB. This is usually needed for USB,
669 sound, many IDE/SATA chipsets and some other devices.
670 Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
671 based hardware IOMMU and a software bounce buffer based IOMMU used
672 on Intel systems and as fallback.
673 The code is only active when needed (enough memory and limited
674 device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
675 too.
676
677config CALGARY_IOMMU
678 bool "IBM Calgary IOMMU support"
679 select SWIOTLB
680 depends on X86_64 && PCI && EXPERIMENTAL
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100681 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100682 Support for hardware IOMMUs in IBM's xSeries x366 and x460
683 systems. Needed to run systems with more than 3GB of memory
684 properly with 32-bit PCI devices that do not support DAC
685 (Double Address Cycle). Calgary also supports bus level
686 isolation, where all DMAs pass through the IOMMU. This
687 prevents them from going anywhere except their intended
688 destination. This catches hard-to-find kernel bugs and
689 mis-behaving drivers and devices that do not use the DMA-API
690 properly to set up their DMA buffers. The IOMMU can be
691 turned off at boot time with the iommu=off parameter.
692 Normally the kernel will make the right choice by itself.
693 If unsure, say Y.
694
695config CALGARY_IOMMU_ENABLED_BY_DEFAULT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100696 def_bool y
697 prompt "Should Calgary be enabled by default?"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100698 depends on CALGARY_IOMMU
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100699 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100700 Should Calgary be enabled by default? if you choose 'y', Calgary
701 will be used (if it exists). If you choose 'n', Calgary will not be
702 used even if it exists. If you choose 'n' and would like to use
703 Calgary anyway, pass 'iommu=calgary' on the kernel command line.
704 If unsure, say Y.
705
Joerg Roedel2b188722008-06-26 21:27:37 +0200706config AMD_IOMMU
707 bool "AMD IOMMU support"
Ingo Molnar07c40e82008-06-27 11:31:28 +0200708 select SWIOTLB
Joerg Roedela80dc3e2008-09-11 16:51:41 +0200709 select PCI_MSI
Ingo Molnar24d2ba02008-06-27 10:37:03 +0200710 depends on X86_64 && PCI && ACPI
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100711 ---help---
Joerg Roedel18d22202008-07-03 19:35:06 +0200712 With this option you can enable support for AMD IOMMU hardware in
713 your system. An IOMMU is a hardware component which provides
714 remapping of DMA memory accesses from devices. With an AMD IOMMU you
715 can isolate the the DMA memory of different devices and protect the
716 system from misbehaving device drivers or hardware.
717
718 You can find out if your system has an AMD IOMMU if you look into
719 your BIOS for an option to enable it or if you have an IVRS ACPI
720 table.
Joerg Roedel2b188722008-06-26 21:27:37 +0200721
Joerg Roedel2e117602008-12-11 19:00:12 +0100722config AMD_IOMMU_STATS
723 bool "Export AMD IOMMU statistics to debugfs"
724 depends on AMD_IOMMU
725 select DEBUG_FS
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100726 ---help---
Joerg Roedel2e117602008-12-11 19:00:12 +0100727 This option enables code in the AMD IOMMU driver to collect various
728 statistics about whats happening in the driver and exports that
729 information to userspace via debugfs.
730 If unsure, say N.
731
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100732# need this always selected by IOMMU for the VIA workaround
733config SWIOTLB
Joerg Roedela1afd012008-11-18 12:44:21 +0100734 def_bool y if X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100735 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100736 Support for software bounce buffers used on x86-64 systems
737 which don't have a hardware IOMMU (e.g. the current generation
738 of Intel's x86-64 CPUs). Using this PCI devices which can only
739 access 32-bits of memory can be used on systems with more than
740 3 GB of memory. If unsure, say Y.
741
FUJITA Tomonoria8522502008-04-29 00:59:36 -0700742config IOMMU_HELPER
FUJITA Tomonori18b743d2008-07-10 09:50:50 +0900743 def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU)
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700744
Joerg Roedel1aaf1182008-11-26 17:25:13 +0100745config IOMMU_API
746 def_bool (AMD_IOMMU || DMAR)
747
Mike Travis1184dc22008-05-12 21:21:12 +0200748config MAXSMP
749 bool "Configure Maximum number of SMP Processors and NUMA Nodes"
Mike Travis36f51012008-12-16 17:33:51 -0800750 depends on X86_64 && SMP && DEBUG_KERNEL && EXPERIMENTAL
751 select CPUMASK_OFFSTACK
Mike Travis1184dc22008-05-12 21:21:12 +0200752 default n
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100753 ---help---
Mike Travis1184dc22008-05-12 21:21:12 +0200754 Configure maximum number of CPUS and NUMA Nodes for this architecture.
755 If unsure, say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100756
757config NR_CPUS
Mike Travis36f51012008-12-16 17:33:51 -0800758 int "Maximum number of CPUs" if SMP && !MAXSMP
Michael K. Johnson2a3313f2009-04-21 21:44:48 -0400759 range 2 8 if SMP && X86_32 && !X86_BIGSMP
Mike Travis36f51012008-12-16 17:33:51 -0800760 range 2 512 if SMP && !MAXSMP
Mike Travis78637a92008-12-16 17:34:00 -0800761 default "1" if !SMP
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700762 default "4096" if MAXSMP
Mike Travis78637a92008-12-16 17:34:00 -0800763 default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000)
764 default "8" if SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100765 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100766 This allows you to specify the maximum number of CPUs which this
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700767 kernel will support. The maximum supported value is 512 and the
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100768 minimum value which makes sense is 2.
769
770 This is purely to save memory - each supported CPU adds
771 approximately eight kilobytes to the kernel image.
772
773config SCHED_SMT
774 bool "SMT (Hyperthreading) scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800775 depends on X86_HT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100776 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100777 SMT scheduler support improves the CPU scheduler's decision making
778 when dealing with Intel Pentium 4 chips with HyperThreading at a
779 cost of slightly increased overhead in some places. If unsure say
780 N here.
781
782config SCHED_MC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100783 def_bool y
784 prompt "Multi-core scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800785 depends on X86_HT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100786 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100787 Multi-core scheduler support improves the CPU scheduler's decision
788 making when dealing with multi-core CPU chips at a cost of slightly
789 increased overhead in some places. If unsure say N here.
790
791source "kernel/Kconfig.preempt"
792
793config X86_UP_APIC
794 bool "Local APIC support on uniprocessors"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100795 depends on X86_32 && !SMP && !X86_32_NON_STANDARD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100796 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100797 A local APIC (Advanced Programmable Interrupt Controller) is an
798 integrated interrupt controller in the CPU. If you have a single-CPU
799 system which has a processor with a local APIC, you can say Y here to
800 enable and use it. If you say Y here even though your machine doesn't
801 have a local APIC, then the kernel will still run with no slowdown at
802 all. The local APIC supports CPU-generated self-interrupts (timer,
803 performance counters), and the NMI watchdog which detects hard
804 lockups.
805
806config X86_UP_IOAPIC
807 bool "IO-APIC support on uniprocessors"
808 depends on X86_UP_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100809 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100810 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
811 SMP-capable replacement for PC-style interrupt controllers. Most
812 SMP systems and many recent uniprocessor systems have one.
813
814 If you have a single-CPU system with an IO-APIC, you can say Y here
815 to use it. If you say Y here even though your machine doesn't have
816 an IO-APIC, then the kernel will still run with no slowdown at all.
817
818config X86_LOCAL_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100819 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100820 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100821
822config X86_IO_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100823 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100824 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100825
826config X86_VISWS_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100827 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100828 depends on X86_32 && X86_VISWS
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100829
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200830config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
831 bool "Reroute for broken boot IRQs"
832 default n
833 depends on X86_IO_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100834 ---help---
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200835 This option enables a workaround that fixes a source of
836 spurious interrupts. This is recommended when threaded
837 interrupt handling is used on systems where the generation of
838 superfluous "boot interrupts" cannot be disabled.
839
840 Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
841 entry in the chipset's IO-APIC is masked (as, e.g. the RT
842 kernel does during interrupt handling). On chipsets where this
843 boot IRQ generation cannot be disabled, this workaround keeps
844 the original IRQ line masked so that only the equivalent "boot
845 IRQ" is delivered to the CPUs. The workaround also tells the
846 kernel to set up the IRQ handler on the boot IRQ line. In this
847 way only one interrupt is delivered to the kernel. Otherwise
848 the spurious second interrupt may cause the kernel to bring
849 down (vital) interrupt lines.
850
851 Only affects "broken" chipsets. Interrupt sharing may be
852 increased on these systems.
853
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100854config X86_MCE
Andi Kleenbab9bc62009-07-09 00:31:38 +0200855 bool "Machine Check / overheating reporting"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100856 ---help---
Andi Kleenbab9bc62009-07-09 00:31:38 +0200857 Machine Check support allows the processor to notify the
858 kernel if it detects a problem (e.g. overheating, data corruption).
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100859 The action the kernel takes depends on the severity of the problem,
Andi Kleenbab9bc62009-07-09 00:31:38 +0200860 ranging from warning messages to halting the machine.
Andi Kleen4efc0672009-04-28 19:07:31 +0200861
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100862config X86_MCE_INTEL
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100863 def_bool y
864 prompt "Intel MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +0200865 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100866 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100867 Additional support for intel specific MCE features such as
868 the thermal monitor.
869
870config X86_MCE_AMD
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100871 def_bool y
872 prompt "AMD MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +0200873 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100874 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100875 Additional support for AMD specific MCE features such as
876 the DRAM Error Threshold.
877
Andi Kleen4efc0672009-04-28 19:07:31 +0200878config X86_ANCIENT_MCE
Hidetoshi Setocd13adcc2009-05-27 16:57:31 +0900879 def_bool n
Andi Kleenc31d9632009-07-09 00:31:37 +0200880 depends on X86_32 && X86_MCE
Hidetoshi Setocd13adcc2009-05-27 16:57:31 +0900881 prompt "Support for old Pentium 5 / WinChip machine checks"
882 ---help---
883 Include support for machine check handling on old Pentium 5 or WinChip
884 systems. These typically need to be enabled explicitely on the command
885 line.
Andi Kleen4efc0672009-04-28 19:07:31 +0200886
Andi Kleenb2762682009-02-12 13:49:31 +0100887config X86_MCE_THRESHOLD
888 depends on X86_MCE_AMD || X86_MCE_INTEL
889 bool
890 default y
891
Andi Kleenea149b32009-04-29 19:31:00 +0200892config X86_MCE_INJECT
Andi Kleenc1ebf832009-07-09 00:31:41 +0200893 depends on X86_MCE
Andi Kleenea149b32009-04-29 19:31:00 +0200894 tristate "Machine check injector support"
895 ---help---
896 Provide support for injecting machine checks for testing purposes.
897 If you don't know what a machine check is and you don't do kernel
898 QA it is safe to say n.
899
Andi Kleen4efc0672009-04-28 19:07:31 +0200900config X86_THERMAL_VECTOR
901 def_bool y
Andi Kleen5bb38ad2009-07-09 00:31:39 +0200902 depends on X86_MCE_INTEL
Andi Kleen4efc0672009-04-28 19:07:31 +0200903
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100904config VM86
905 bool "Enable VM86 support" if EMBEDDED
906 default y
907 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100908 ---help---
909 This option is required by programs like DOSEMU to run 16-bit legacy
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100910 code on X86 processors. It also may be needed by software like
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100911 XFree86 to initialize some video cards via BIOS. Disabling this
912 option saves about 6k.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100913
914config TOSHIBA
915 tristate "Toshiba Laptop support"
916 depends on X86_32
917 ---help---
918 This adds a driver to safely access the System Management Mode of
919 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
920 not work on models with a Phoenix BIOS. The System Management Mode
921 is used to set the BIOS and power saving options on Toshiba portables.
922
923 For information on utilities to make use of this driver see the
924 Toshiba Linux utilities web site at:
925 <http://www.buzzard.org.uk/toshiba/>.
926
927 Say Y if you intend to run this kernel on a Toshiba portable.
928 Say N otherwise.
929
930config I8K
931 tristate "Dell laptop support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100932 ---help---
933 This adds a driver to safely access the System Management Mode
934 of the CPU on the Dell Inspiron 8000. The System Management Mode
935 is used to read cpu temperature and cooling fan status and to
936 control the fans on the I8K portables.
937
938 This driver has been tested only on the Inspiron 8000 but it may
939 also work with other Dell laptops. You can force loading on other
940 models by passing the parameter `force=1' to the module. Use at
941 your own risk.
942
943 For information on utilities to make use of this driver see the
944 I8K Linux utilities web site at:
945 <http://people.debian.org/~dz/i8k/>
946
947 Say Y if you intend to run this kernel on a Dell Inspiron 8000.
948 Say N otherwise.
949
950config X86_REBOOTFIXUPS
Jan Beulich9ba16082008-10-15 22:01:38 -0700951 bool "Enable X86 board specific fixups for reboot"
952 depends on X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100953 ---help---
954 This enables chipset and/or board specific fixups to be done
955 in order to get reboot to work correctly. This is only needed on
956 some combinations of hardware and BIOS. The symptom, for which
957 this config is intended, is when reboot ends with a stalled/hung
958 system.
959
960 Currently, the only fixup is for the Geode machines using
Florian Fainelli5e3a77e2008-01-30 13:33:36 +0100961 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100962
963 Say Y if you want to enable the fixup. Currently, it's safe to
964 enable this option even if you don't need it.
965 Say N otherwise.
966
967config MICROCODE
Peter Oruba8d86f392008-07-28 18:44:21 +0200968 tristate "/dev/cpu/microcode - microcode support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100969 select FW_LOADER
970 ---help---
971 If you say Y here, you will be able to update the microcode on
Peter Oruba80cc9f12008-07-28 18:44:22 +0200972 certain Intel and AMD processors. The Intel support is for the
973 IA32 family, e.g. Pentium Pro, Pentium II, Pentium III,
974 Pentium 4, Xeon etc. The AMD support is for family 0x10 and
975 0x11 processors, e.g. Opteron, Phenom and Turion 64 Ultra.
976 You will obviously need the actual microcode binary data itself
977 which is not shipped with the Linux kernel.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100978
Peter Oruba8d86f392008-07-28 18:44:21 +0200979 This option selects the general module only, you need to select
980 at least one vendor specific module as well.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100981
982 To compile this driver as a module, choose M here: the
983 module will be called microcode.
984
Peter Oruba8d86f392008-07-28 18:44:21 +0200985config MICROCODE_INTEL
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100986 bool "Intel microcode patch loading support"
987 depends on MICROCODE
988 default MICROCODE
989 select FW_LOADER
990 ---help---
991 This options enables microcode patch loading support for Intel
992 processors.
Peter Oruba8d86f392008-07-28 18:44:21 +0200993
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100994 For latest news and information on obtaining all the required
995 Intel ingredients for this driver, check:
996 <http://www.urbanmyth.org/microcode/>.
Peter Oruba8d86f392008-07-28 18:44:21 +0200997
Peter Oruba80cc9f12008-07-28 18:44:22 +0200998config MICROCODE_AMD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100999 bool "AMD microcode patch loading support"
1000 depends on MICROCODE
1001 select FW_LOADER
1002 ---help---
1003 If you select this option, microcode patch loading support for AMD
1004 processors will be enabled.
Peter Oruba80cc9f12008-07-28 18:44:22 +02001005
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001006config MICROCODE_OLD_INTERFACE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001007 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001008 depends on MICROCODE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001009
1010config X86_MSR
1011 tristate "/dev/cpu/*/msr - Model-specific register support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001012 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001013 This device gives privileged processes access to the x86
1014 Model-Specific Registers (MSRs). It is a character device with
1015 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
1016 MSR accesses are directed to a specific CPU on multi-processor
1017 systems.
1018
1019config X86_CPUID
1020 tristate "/dev/cpu/*/cpuid - CPU information support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001021 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001022 This device gives processes access to the x86 CPUID instruction to
1023 be executed on a specific processor. It is a character device
1024 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
1025 /dev/cpu/31/cpuid.
1026
1027choice
1028 prompt "High Memory Support"
1029 default HIGHMEM4G if !X86_NUMAQ
1030 default HIGHMEM64G if X86_NUMAQ
1031 depends on X86_32
1032
1033config NOHIGHMEM
1034 bool "off"
1035 depends on !X86_NUMAQ
1036 ---help---
1037 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
1038 However, the address space of 32-bit x86 processors is only 4
1039 Gigabytes large. That means that, if you have a large amount of
1040 physical memory, not all of it can be "permanently mapped" by the
1041 kernel. The physical memory that's not permanently mapped is called
1042 "high memory".
1043
1044 If you are compiling a kernel which will never run on a machine with
1045 more than 1 Gigabyte total physical RAM, answer "off" here (default
1046 choice and suitable for most users). This will result in a "3GB/1GB"
1047 split: 3GB are mapped so that each process sees a 3GB virtual memory
1048 space and the remaining part of the 4GB virtual memory space is used
1049 by the kernel to permanently map as much physical memory as
1050 possible.
1051
1052 If the machine has between 1 and 4 Gigabytes physical RAM, then
1053 answer "4GB" here.
1054
1055 If more than 4 Gigabytes is used then answer "64GB" here. This
1056 selection turns Intel PAE (Physical Address Extension) mode on.
1057 PAE implements 3-level paging on IA32 processors. PAE is fully
1058 supported by Linux, PAE mode is implemented on all recent Intel
1059 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
1060 then the kernel will not boot on CPUs that don't support PAE!
1061
1062 The actual amount of total physical memory will either be
1063 auto detected or can be forced by using a kernel command line option
1064 such as "mem=256M". (Try "man bootparam" or see the documentation of
1065 your boot loader (lilo or loadlin) about how to pass options to the
1066 kernel at boot time.)
1067
1068 If unsure, say "off".
1069
1070config HIGHMEM4G
1071 bool "4GB"
1072 depends on !X86_NUMAQ
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001073 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001074 Select this if you have a 32-bit processor and between 1 and 4
1075 gigabytes of physical RAM.
1076
1077config HIGHMEM64G
1078 bool "64GB"
1079 depends on !M386 && !M486
1080 select X86_PAE
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001081 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001082 Select this if you have a 32-bit processor and more than 4
1083 gigabytes of physical RAM.
1084
1085endchoice
1086
1087choice
1088 depends on EXPERIMENTAL
1089 prompt "Memory split" if EMBEDDED
1090 default VMSPLIT_3G
1091 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001092 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001093 Select the desired split between kernel and user memory.
1094
1095 If the address range available to the kernel is less than the
1096 physical memory installed, the remaining memory will be available
1097 as "high memory". Accessing high memory is a little more costly
1098 than low memory, as it needs to be mapped into the kernel first.
1099 Note that increasing the kernel address space limits the range
1100 available to user programs, making the address space there
1101 tighter. Selecting anything other than the default 3G/1G split
1102 will also likely make your kernel incompatible with binary-only
1103 kernel modules.
1104
1105 If you are not absolutely sure what you are doing, leave this
1106 option alone!
1107
1108 config VMSPLIT_3G
1109 bool "3G/1G user/kernel split"
1110 config VMSPLIT_3G_OPT
1111 depends on !X86_PAE
1112 bool "3G/1G user/kernel split (for full 1G low memory)"
1113 config VMSPLIT_2G
1114 bool "2G/2G user/kernel split"
1115 config VMSPLIT_2G_OPT
1116 depends on !X86_PAE
1117 bool "2G/2G user/kernel split (for full 2G low memory)"
1118 config VMSPLIT_1G
1119 bool "1G/3G user/kernel split"
1120endchoice
1121
1122config PAGE_OFFSET
1123 hex
1124 default 0xB0000000 if VMSPLIT_3G_OPT
1125 default 0x80000000 if VMSPLIT_2G
1126 default 0x78000000 if VMSPLIT_2G_OPT
1127 default 0x40000000 if VMSPLIT_1G
1128 default 0xC0000000
1129 depends on X86_32
1130
1131config HIGHMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001132 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001133 depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001134
1135config X86_PAE
Jan Beulich9ba16082008-10-15 22:01:38 -07001136 bool "PAE (Physical Address Extension) Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001137 depends on X86_32 && !HIGHMEM4G
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001138 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001139 PAE is required for NX support, and furthermore enables
1140 larger swapspace support for non-overcommit purposes. It
1141 has the cost of more pagetable lookup overhead, and also
1142 consumes more pagetable space per process.
1143
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001144config ARCH_PHYS_ADDR_T_64BIT
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001145 def_bool X86_64 || X86_PAE
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001146
Nick Piggin9e899812008-10-22 12:33:16 +02001147config DIRECT_GBPAGES
1148 bool "Enable 1GB pages for kernel pagetables" if EMBEDDED
1149 default y
1150 depends on X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001151 ---help---
Nick Piggin9e899812008-10-22 12:33:16 +02001152 Allow the kernel linear mapping to use 1GB pages on CPUs that
1153 support it. This can improve the kernel's performance a tiny bit by
1154 reducing TLB pressure. If in doubt, say "Y".
1155
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001156# Common NUMA Features
1157config NUMA
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001158 bool "Numa Memory Allocation and Scheduler Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001159 depends on SMP
Rafael J. Wysocki604d2052008-11-12 23:26:14 +01001160 depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL)
Yinghai Lu0699eae2008-06-17 15:39:01 -07001161 default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001162 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001163 Enable NUMA (Non Uniform Memory Access) support.
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001164
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001165 The kernel will try to allocate memory used by a CPU on the
1166 local memory controller of the CPU and add some more
1167 NUMA awareness to the kernel.
1168
Ingo Molnarc280ea52008-11-08 13:29:45 +01001169 For 64-bit this is recommended if the system is Intel Core i7
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001170 (or later), AMD Opteron, or EM64T NUMA.
1171
1172 For 32-bit this is only needed on (rare) 32-bit-only platforms
1173 that support NUMA topologies, such as NUMAQ / Summit, or if you
1174 boot a 32-bit kernel on a 64-bit NUMA platform.
1175
1176 Otherwise, you should say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001177
1178comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
1179 depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
1180
1181config K8_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001182 def_bool y
1183 prompt "Old style AMD Opteron NUMA detection"
1184 depends on X86_64 && NUMA && PCI
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001185 ---help---
1186 Enable K8 NUMA node topology detection. You should say Y here if
1187 you have a multi processor AMD K8 system. This uses an old
1188 method to read the NUMA configuration directly from the builtin
1189 Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
1190 instead, which also takes priority if both are compiled in.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001191
1192config X86_64_ACPI_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001193 def_bool y
1194 prompt "ACPI NUMA detection"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001195 depends on X86_64 && NUMA && ACPI && PCI
1196 select ACPI_NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001197 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001198 Enable ACPI SRAT based node topology detection.
1199
Suresh Siddha6ec6e0d2008-03-25 10:14:35 -07001200# Some NUMA nodes have memory ranges that span
1201# other nodes. Even though a pfn is valid and
1202# between a node's start and end pfns, it may not
1203# reside on that node. See memmap_init_zone()
1204# for details.
1205config NODES_SPAN_OTHER_NODES
1206 def_bool y
1207 depends on X86_64_ACPI_NUMA
1208
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001209config NUMA_EMU
1210 bool "NUMA emulation"
1211 depends on X86_64 && NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001212 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001213 Enable NUMA emulation. A flat machine will be split
1214 into virtual nodes when booted with "numa=fake=N", where N is the
1215 number of nodes. This is only useful for debugging.
1216
1217config NODES_SHIFT
Linus Torvaldsd25e26b2008-08-25 14:15:38 -07001218 int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
David Rientjes51591e32010-03-25 15:39:27 -07001219 range 1 10
1220 default "10" if MAXSMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001221 default "6" if X86_64
1222 default "4" if X86_NUMAQ
1223 default "3"
1224 depends on NEED_MULTIPLE_NODES
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001225 ---help---
Mike Travis1184dc22008-05-12 21:21:12 +02001226 Specify the maximum number of NUMA Nodes available on the target
Matt LaPlante692105b2009-01-26 11:12:25 +01001227 system. Increases memory reserved to accommodate various tables.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001228
Tejun Heoc1329372009-02-24 11:57:20 +09001229config HAVE_ARCH_BOOTMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001230 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001231 depends on X86_32 && NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001232
1233config ARCH_HAVE_MEMORY_PRESENT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001234 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001235 depends on X86_32 && DISCONTIGMEM
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001236
1237config NEED_NODE_MEMMAP_SIZE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001238 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001239 depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001240
1241config HAVE_ARCH_ALLOC_REMAP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001242 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001243 depends on X86_32 && NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001244
1245config ARCH_FLATMEM_ENABLE
1246 def_bool y
Jeff Chua99809962008-08-06 19:09:53 +08001247 depends on X86_32 && ARCH_SELECT_MEMORY_MODEL && !NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001248
1249config ARCH_DISCONTIGMEM_ENABLE
1250 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001251 depends on NUMA && X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001252
1253config ARCH_DISCONTIGMEM_DEFAULT
1254 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001255 depends on NUMA && X86_32
1256
KAMEZAWA Hiroyuki94925872009-09-22 16:45:45 -07001257config ARCH_PROC_KCORE_TEXT
1258 def_bool y
1259 depends on X86_64 && PROC_KCORE
1260
Christoph Lameterb2632952008-01-30 13:30:47 +01001261config ARCH_SPARSEMEM_DEFAULT
1262 def_bool y
1263 depends on X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001264
1265config ARCH_SPARSEMEM_ENABLE
1266 def_bool y
Yinghai Lu4272ebf2009-01-29 15:14:46 -08001267 depends on X86_64 || NUMA || (EXPERIMENTAL && X86_32) || X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001268 select SPARSEMEM_STATIC if X86_32
1269 select SPARSEMEM_VMEMMAP_ENABLE if X86_64
1270
1271config ARCH_SELECT_MEMORY_MODEL
1272 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001273 depends on ARCH_SPARSEMEM_ENABLE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001274
1275config ARCH_MEMORY_PROBE
1276 def_bool X86_64
1277 depends on MEMORY_HOTPLUG
1278
Avi Kivitya29815a2010-01-10 16:28:09 +02001279config ILLEGAL_POINTER_VALUE
1280 hex
1281 default 0 if X86_32
1282 default 0xdead000000000000 if X86_64
1283
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001284source "mm/Kconfig"
1285
1286config HIGHPTE
1287 bool "Allocate 3rd-level pagetables from highmem"
1288 depends on X86_32 && (HIGHMEM4G || HIGHMEM64G)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001289 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001290 The VM uses one page table entry for each page of physical memory.
1291 For systems with a lot of RAM, this can be wasteful of precious
1292 low memory. Setting this option will put user-space page table
1293 entries in high memory.
1294
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001295config X86_CHECK_BIOS_CORRUPTION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001296 bool "Check for low memory corruption"
1297 ---help---
1298 Periodically check for memory corruption in low memory, which
1299 is suspected to be caused by BIOS. Even when enabled in the
1300 configuration, it is disabled at runtime. Enable it by
1301 setting "memory_corruption_check=1" on the kernel command
1302 line. By default it scans the low 64k of memory every 60
1303 seconds; see the memory_corruption_check_size and
1304 memory_corruption_check_period parameters in
1305 Documentation/kernel-parameters.txt to adjust this.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001306
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001307 When enabled with the default parameters, this option has
1308 almost no overhead, as it reserves a relatively small amount
1309 of memory and scans it infrequently. It both detects corruption
1310 and prevents it from affecting the running system.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001311
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001312 It is, however, intended as a diagnostic tool; if repeatable
1313 BIOS-originated corruption always affects the same memory,
1314 you can use memmap= to prevent the kernel from using that
1315 memory.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001316
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001317config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001318 bool "Set the default setting of memory_corruption_check"
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001319 depends on X86_CHECK_BIOS_CORRUPTION
1320 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001321 ---help---
1322 Set whether the default state of memory_corruption_check is
1323 on or off.
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001324
Ingo Molnarfc381512008-09-16 10:07:34 +02001325config X86_RESERVE_LOW_64K
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001326 bool "Reserve low 64K of RAM on AMI/Phoenix BIOSen"
Ingo Molnarfc381512008-09-16 10:07:34 +02001327 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001328 ---help---
1329 Reserve the first 64K of physical RAM on BIOSes that are known
1330 to potentially corrupt that memory range. A numbers of BIOSes are
1331 known to utilize this area during suspend/resume, so it must not
1332 be used by the kernel.
Ingo Molnarfc381512008-09-16 10:07:34 +02001333
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001334 Set this to N if you are absolutely sure that you trust the BIOS
1335 to get all its memory reservations and usages right.
Ingo Molnarfc381512008-09-16 10:07:34 +02001336
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001337 If you have doubts about the BIOS (e.g. suspend/resume does not
1338 work or there's kernel crashes after certain hardware hotplug
1339 events) and it's not AMI or Phoenix, then you might want to enable
1340 X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check typical
1341 corruption patterns.
Ingo Molnarfc381512008-09-16 10:07:34 +02001342
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001343 Say Y if unsure.
Ingo Molnarfc381512008-09-16 10:07:34 +02001344
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001345config MATH_EMULATION
1346 bool
1347 prompt "Math emulation" if X86_32
1348 ---help---
1349 Linux can emulate a math coprocessor (used for floating point
1350 operations) if you don't have one. 486DX and Pentium processors have
1351 a math coprocessor built in, 486SX and 386 do not, unless you added
1352 a 487DX or 387, respectively. (The messages during boot time can
1353 give you some hints here ["man dmesg"].) Everyone needs either a
1354 coprocessor or this emulation.
1355
1356 If you don't have a math coprocessor, you need to say Y here; if you
1357 say Y here even though you have a coprocessor, the coprocessor will
1358 be used nevertheless. (This behavior can be changed with the kernel
1359 command line option "no387", which comes handy if your coprocessor
1360 is broken. Try "man bootparam" or see the documentation of your boot
1361 loader (lilo or loadlin) about how to pass options to the kernel at
1362 boot time.) This means that it is a good idea to say Y here if you
1363 intend to use this kernel on different machines.
1364
1365 More information about the internals of the Linux math coprocessor
1366 emulation can be found in <file:arch/x86/math-emu/README>.
1367
1368 If you are not sure, say Y; apart from resulting in a 66 KB bigger
1369 kernel, it won't hurt.
1370
1371config MTRR
Arjan van de Venc03cb312009-10-11 10:33:02 -07001372 bool
1373 default y
1374 prompt "MTRR (Memory Type Range Register) support" if EMBEDDED
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001375 ---help---
1376 On Intel P6 family processors (Pentium Pro, Pentium II and later)
1377 the Memory Type Range Registers (MTRRs) may be used to control
1378 processor access to memory ranges. This is most useful if you have
1379 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
1380 allows bus write transfers to be combined into a larger transfer
1381 before bursting over the PCI/AGP bus. This can increase performance
1382 of image write operations 2.5 times or more. Saying Y here creates a
1383 /proc/mtrr file which may be used to manipulate your processor's
1384 MTRRs. Typically the X server should use this.
1385
1386 This code has a reasonably generic interface so that similar
1387 control registers on other processors can be easily supported
1388 as well:
1389
1390 The Cyrix 6x86, 6x86MX and M II processors have Address Range
1391 Registers (ARRs) which provide a similar functionality to MTRRs. For
1392 these, the ARRs are used to emulate the MTRRs.
1393 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
1394 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
1395 write-combining. All of these processors are supported by this code
1396 and it makes sense to say Y here if you have one of them.
1397
1398 Saying Y here also fixes a problem with buggy SMP BIOSes which only
1399 set the MTRRs for the boot CPU and not for the secondary CPUs. This
1400 can lead to all sorts of problems, so it's good to say Y here.
1401
1402 You can safely say Y even if your machine doesn't have MTRRs, you'll
1403 just add about 9 KB to your kernel.
1404
Randy Dunlap7225e752008-07-26 17:54:22 -07001405 See <file:Documentation/x86/mtrr.txt> for more information.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001406
Yinghai Lu95ffa242008-04-29 03:52:33 -07001407config MTRR_SANITIZER
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001408 def_bool y
Yinghai Lu95ffa242008-04-29 03:52:33 -07001409 prompt "MTRR cleanup support"
1410 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001411 ---help---
Thomas Gleixneraba37282008-07-15 14:48:48 +02001412 Convert MTRR layout from continuous to discrete, so X drivers can
1413 add writeback entries.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001414
Thomas Gleixneraba37282008-07-15 14:48:48 +02001415 Can be disabled with disable_mtrr_cleanup on the kernel command line.
Matt LaPlante692105b2009-01-26 11:12:25 +01001416 The largest mtrr entry size for a continuous block can be set with
Thomas Gleixneraba37282008-07-15 14:48:48 +02001417 mtrr_chunk_size.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001418
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001419 If unsure, say Y.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001420
1421config MTRR_SANITIZER_ENABLE_DEFAULT
Yinghai Luf5098d62008-04-29 20:25:58 -07001422 int "MTRR cleanup enable value (0-1)"
1423 range 0 1
1424 default "0"
Yinghai Lu95ffa242008-04-29 03:52:33 -07001425 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001426 ---help---
Yinghai Luf5098d62008-04-29 20:25:58 -07001427 Enable mtrr cleanup default value
Yinghai Lu95ffa242008-04-29 03:52:33 -07001428
Yinghai Lu12031a62008-05-02 02:40:22 -07001429config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
1430 int "MTRR cleanup spare reg num (0-7)"
1431 range 0 7
1432 default "1"
1433 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001434 ---help---
Yinghai Lu12031a62008-05-02 02:40:22 -07001435 mtrr cleanup spare entries default, it can be changed via
Thomas Gleixneraba37282008-07-15 14:48:48 +02001436 mtrr_spare_reg_nr=N on the kernel command line.
Yinghai Lu12031a62008-05-02 02:40:22 -07001437
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001438config X86_PAT
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001439 bool
Arjan van de Venc03cb312009-10-11 10:33:02 -07001440 default y
1441 prompt "x86 PAT support" if EMBEDDED
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001442 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001443 ---help---
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001444 Use PAT attributes to setup page level cache control.
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001445
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001446 PATs are the modern equivalents of MTRRs and are much more
1447 flexible than MTRRs.
1448
1449 Say N here if you see bootup problems (boot crash, boot hang,
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001450 spontaneous reboots) or a non-working video driver.
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001451
1452 If unsure, say Y.
1453
Venkatesh Pallipadi46cf98c2009-07-10 09:57:37 -07001454config ARCH_USES_PG_UNCACHED
1455 def_bool y
1456 depends on X86_PAT
1457
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001458config EFI
Jan Beulich9ba16082008-10-15 22:01:38 -07001459 bool "EFI runtime service support"
Huang, Ying5b836832008-01-30 13:31:19 +01001460 depends on ACPI
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001461 ---help---
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001462 This enables the kernel to use EFI runtime services that are
1463 available (such as the EFI variable services).
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001464
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001465 This option is only useful on systems that have EFI firmware.
1466 In addition, you should use the latest ELILO loader available
1467 at <http://elilo.sourceforge.net> in order to take advantage
1468 of EFI runtime services. However, even with this option, the
1469 resultant kernel should continue to boot on existing non-EFI
1470 platforms.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001471
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001472config SECCOMP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001473 def_bool y
1474 prompt "Enable seccomp to safely compute untrusted bytecode"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001475 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001476 This kernel feature is useful for number crunching applications
1477 that may need to compute untrusted bytecode during their
1478 execution. By using pipes or other transports made available to
1479 the process as file descriptors supporting the read/write
1480 syscalls, it's possible to isolate those applications in
1481 their own address space using seccomp. Once seccomp is
Alexey Dobriyan9c0bbee2008-09-09 11:01:31 +04001482 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001483 and the task is only allowed to execute a few safe syscalls
1484 defined by each seccomp mode.
1485
1486 If unsure, say Y. Only embedded should say N here.
1487
1488config CC_STACKPROTECTOR
1489 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001490 ---help---
1491 This option turns on the -fstack-protector GCC feature. This
Ingo Molnar113c5412008-02-14 10:36:03 +01001492 feature puts, at the beginning of functions, a canary value on
1493 the stack just before the return address, and validates
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001494 the value just before actually returning. Stack based buffer
1495 overflows (that need to overwrite this return address) now also
1496 overwrite the canary, which gets detected and the attack is then
1497 neutralized via a kernel panic.
1498
1499 This feature requires gcc version 4.2 or above, or a distribution
1500 gcc with the feature backported. Older versions are automatically
Ingo Molnar113c5412008-02-14 10:36:03 +01001501 detected and for those versions, this configuration option is
1502 ignored. (and a warning is printed during bootup)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001503
1504source kernel/Kconfig.hz
1505
1506config KEXEC
1507 bool "kexec system call"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001508 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001509 kexec is a system call that implements the ability to shutdown your
1510 current kernel, and to start another kernel. It is like a reboot
1511 but it is independent of the system firmware. And like a reboot
1512 you can start any kernel with it, not just Linux.
1513
1514 The name comes from the similarity to the exec system call.
1515
1516 It is an ongoing process to be certain the hardware in a machine
1517 is properly shutdown, so do not be surprised if this code does not
1518 initially work for you. It may help to enable device hotplugging
1519 support. As of this writing the exact hardware interface is
1520 strongly in flux, so no good recommendation can be made.
1521
1522config CRASH_DUMP
Pavel Machek04b69442008-08-14 17:16:50 +02001523 bool "kernel crash dumps"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001524 depends on X86_64 || (X86_32 && HIGHMEM)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001525 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001526 Generate crash dump after being started by kexec.
1527 This should be normally only set in special crash dump kernels
1528 which are loaded in the main kernel with kexec-tools into
1529 a specially reserved region and then later executed after
1530 a crash by kdump/kexec. The crash dump kernel must be compiled
1531 to a memory address not used by the main kernel or BIOS using
1532 PHYSICAL_START, or it must be built as a relocatable image
1533 (CONFIG_RELOCATABLE=y).
1534 For more details see Documentation/kdump/kdump.txt
1535
Huang Ying3ab83522008-07-25 19:45:07 -07001536config KEXEC_JUMP
1537 bool "kexec jump (EXPERIMENTAL)"
1538 depends on EXPERIMENTAL
Huang Yingfee7b0d2009-03-10 10:57:16 +08001539 depends on KEXEC && HIBERNATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001540 ---help---
Huang Ying89081d12008-07-25 19:45:10 -07001541 Jump between original kernel and kexeced kernel and invoke
1542 code in physical address mode via KEXEC
Huang Ying3ab83522008-07-25 19:45:07 -07001543
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001544config PHYSICAL_START
1545 hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001546 default "0x1000000"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001547 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001548 This gives the physical address where the kernel is loaded.
1549
1550 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
1551 bzImage will decompress itself to above physical address and
1552 run from there. Otherwise, bzImage will run from the address where
1553 it has been loaded by the boot loader and will ignore above physical
1554 address.
1555
1556 In normal kdump cases one does not have to set/change this option
1557 as now bzImage can be compiled as a completely relocatable image
1558 (CONFIG_RELOCATABLE=y) and be used to load and run from a different
1559 address. This option is mainly useful for the folks who don't want
1560 to use a bzImage for capturing the crash dump and want to use a
1561 vmlinux instead. vmlinux is not relocatable hence a kernel needs
1562 to be specifically compiled to run from a specific memory area
1563 (normally a reserved region) and this option comes handy.
1564
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001565 So if you are using bzImage for capturing the crash dump,
1566 leave the value here unchanged to 0x1000000 and set
1567 CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux
1568 for capturing the crash dump change this value to start of
1569 the reserved region. In other words, it can be set based on
1570 the "X" value as specified in the "crashkernel=YM@XM"
1571 command line boot parameter passed to the panic-ed
1572 kernel. Please take a look at Documentation/kdump/kdump.txt
1573 for more details about crash dumps.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001574
1575 Usage of bzImage for capturing the crash dump is recommended as
1576 one does not have to build two kernels. Same kernel can be used
1577 as production kernel and capture kernel. Above option should have
1578 gone away after relocatable bzImage support is introduced. But it
1579 is present because there are users out there who continue to use
1580 vmlinux for dump capture. This option should go away down the
1581 line.
1582
1583 Don't change this unless you know what you are doing.
1584
1585config RELOCATABLE
H. Peter Anvin26717802009-05-07 14:19:34 -07001586 bool "Build a relocatable kernel"
1587 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001588 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001589 This builds a kernel image that retains relocation information
1590 so it can be loaded someplace besides the default 1MB.
1591 The relocations tend to make the kernel binary about 10% larger,
1592 but are discarded at runtime.
1593
1594 One use is for the kexec on panic case where the recovery kernel
1595 must live at a different physical address than the primary
1596 kernel.
1597
1598 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
1599 it has been loaded at and the compile time physical address
1600 (CONFIG_PHYSICAL_START) is ignored.
1601
H. Peter Anvin845adf72009-05-05 21:20:51 -07001602# Relocation on x86-32 needs some additional build support
1603config X86_NEED_RELOCS
1604 def_bool y
1605 depends on X86_32 && RELOCATABLE
1606
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001607config PHYSICAL_ALIGN
1608 hex
1609 prompt "Alignment value to which kernel should be aligned" if X86_32
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001610 default "0x1000000"
1611 range 0x2000 0x1000000
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001612 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001613 This value puts the alignment restrictions on physical address
1614 where kernel is loaded and run from. Kernel is compiled for an
1615 address which meets above alignment restriction.
1616
1617 If bootloader loads the kernel at a non-aligned address and
1618 CONFIG_RELOCATABLE is set, kernel will move itself to nearest
1619 address aligned to above value and run from there.
1620
1621 If bootloader loads the kernel at a non-aligned address and
1622 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
1623 load address and decompress itself to the address it has been
1624 compiled for and run from there. The address for which kernel is
1625 compiled already meets above alignment restrictions. Hence the
1626 end result is that kernel runs from a physical address meeting
1627 above alignment restrictions.
1628
1629 Don't change this unless you know what you are doing.
1630
1631config HOTPLUG_CPU
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001632 bool "Support for hot-pluggable CPUs"
Ingo Molnar4b19ed92009-01-27 17:47:24 +01001633 depends on SMP && HOTPLUG
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001634 ---help---
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001635 Say Y here to allow turning CPUs off and on. CPUs can be
1636 controlled through /sys/devices/system/cpu.
1637 ( Note: power management support will enable this option
1638 automatically on SMP systems. )
1639 Say N if you want to disable CPU hotplug.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001640
1641config COMPAT_VDSO
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001642 def_bool y
1643 prompt "Compat VDSO support"
Roland McGrathaf65d642008-01-30 13:30:43 +01001644 depends on X86_32 || IA32_EMULATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001645 ---help---
Roland McGrathaf65d642008-01-30 13:30:43 +01001646 Map the 32-bit VDSO to the predictable old-style address too.
Randy Dunlape84446d2009-11-10 15:46:52 -08001647
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001648 Say N here if you are running a sufficiently recent glibc
1649 version (2.3.3 or later), to remove the high-mapped
1650 VDSO mapping and to exclusively use the randomized VDSO.
1651
1652 If unsure, say Y.
1653
Tim Bird516cbf32008-08-12 12:52:36 -07001654config CMDLINE_BOOL
1655 bool "Built-in kernel command line"
1656 default n
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001657 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001658 Allow for specifying boot arguments to the kernel at
1659 build time. On some systems (e.g. embedded ones), it is
1660 necessary or convenient to provide some or all of the
1661 kernel boot arguments with the kernel itself (that is,
1662 to not rely on the boot loader to provide them.)
1663
1664 To compile command line arguments into the kernel,
1665 set this option to 'Y', then fill in the
1666 the boot arguments in CONFIG_CMDLINE.
1667
1668 Systems with fully functional boot loaders (i.e. non-embedded)
1669 should leave this option set to 'N'.
1670
1671config CMDLINE
1672 string "Built-in kernel command string"
1673 depends on CMDLINE_BOOL
1674 default ""
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001675 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001676 Enter arguments here that should be compiled into the kernel
1677 image and used at boot time. If the boot loader provides a
1678 command line at boot time, it is appended to this string to
1679 form the full kernel command line, when the system boots.
1680
1681 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
1682 change this behavior.
1683
1684 In most cases, the command line (whether built-in or provided
1685 by the boot loader) should specify the device for the root
1686 file system.
1687
1688config CMDLINE_OVERRIDE
1689 bool "Built-in command line overrides boot loader arguments"
1690 default n
1691 depends on CMDLINE_BOOL
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001692 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001693 Set this option to 'Y' to have the kernel ignore the boot loader
1694 command line, and use ONLY the built-in command line.
1695
1696 This is used to work around broken boot loaders. This should
1697 be set to 'N' under normal conditions.
1698
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001699endmenu
1700
1701config ARCH_ENABLE_MEMORY_HOTPLUG
1702 def_bool y
1703 depends on X86_64 || (X86_32 && HIGHMEM)
1704
Gary Hade35551052008-10-31 10:52:03 -07001705config ARCH_ENABLE_MEMORY_HOTREMOVE
1706 def_bool y
1707 depends on MEMORY_HOTPLUG
1708
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001709config HAVE_ARCH_EARLY_PFN_TO_NID
1710 def_bool X86_64
1711 depends on NUMA
1712
Bjorn Helgaasda85f862008-11-05 13:37:27 -06001713menu "Power management and ACPI options"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001714
1715config ARCH_HIBERNATION_HEADER
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001716 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001717 depends on X86_64 && HIBERNATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001718
1719source "kernel/power/Kconfig"
1720
1721source "drivers/acpi/Kconfig"
1722
Feng Tangefafc8b2009-08-14 15:23:29 -04001723source "drivers/sfi/Kconfig"
1724
Andi Kleena6b68072008-01-30 13:32:49 +01001725config X86_APM_BOOT
1726 bool
1727 default y
1728 depends on APM || APM_MODULE
1729
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001730menuconfig APM
1731 tristate "APM (Advanced Power Management) BIOS support"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001732 depends on X86_32 && PM_SLEEP
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001733 ---help---
1734 APM is a BIOS specification for saving power using several different
1735 techniques. This is mostly useful for battery powered laptops with
1736 APM compliant BIOSes. If you say Y here, the system time will be
1737 reset after a RESUME operation, the /proc/apm device will provide
1738 battery status information, and user-space programs will receive
1739 notification of APM "events" (e.g. battery status change).
1740
1741 If you select "Y" here, you can disable actual use of the APM
1742 BIOS by passing the "apm=off" option to the kernel at boot time.
1743
1744 Note that the APM support is almost completely disabled for
1745 machines with more than one CPU.
1746
1747 In order to use APM, you will need supporting software. For location
Randy Dunlap53471122008-03-12 18:10:51 -04001748 and more information, read <file:Documentation/power/pm.txt> and the
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001749 Battery Powered Linux mini-HOWTO, available from
1750 <http://www.tldp.org/docs.html#howto>.
1751
1752 This driver does not spin down disk drives (see the hdparm(8)
1753 manpage ("man 8 hdparm") for that), and it doesn't turn off
1754 VESA-compliant "green" monitors.
1755
1756 This driver does not support the TI 4000M TravelMate and the ACER
1757 486/DX4/75 because they don't have compliant BIOSes. Many "green"
1758 desktop machines also don't have compliant BIOSes, and this driver
1759 may cause those machines to panic during the boot phase.
1760
1761 Generally, if you don't have a battery in your machine, there isn't
1762 much point in using this driver and you should say N. If you get
1763 random kernel OOPSes or reboots that don't seem to be related to
1764 anything, try disabling/enabling this option (or disabling/enabling
1765 APM in your BIOS).
1766
1767 Some other things you should try when experiencing seemingly random,
1768 "weird" problems:
1769
1770 1) make sure that you have enough swap space and that it is
1771 enabled.
1772 2) pass the "no-hlt" option to the kernel
1773 3) switch on floating point emulation in the kernel and pass
1774 the "no387" option to the kernel
1775 4) pass the "floppy=nodma" option to the kernel
1776 5) pass the "mem=4M" option to the kernel (thereby disabling
1777 all but the first 4 MB of RAM)
1778 6) make sure that the CPU is not over clocked.
1779 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
1780 8) disable the cache from your BIOS settings
1781 9) install a fan for the video card or exchange video RAM
1782 10) install a better fan for the CPU
1783 11) exchange RAM chips
1784 12) exchange the motherboard.
1785
1786 To compile this driver as a module, choose M here: the
1787 module will be called apm.
1788
1789if APM
1790
1791config APM_IGNORE_USER_SUSPEND
1792 bool "Ignore USER SUSPEND"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001793 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001794 This option will ignore USER SUSPEND requests. On machines with a
1795 compliant APM BIOS, you want to say N. However, on the NEC Versa M
1796 series notebooks, it is necessary to say Y because of a BIOS bug.
1797
1798config APM_DO_ENABLE
1799 bool "Enable PM at boot time"
1800 ---help---
1801 Enable APM features at boot time. From page 36 of the APM BIOS
1802 specification: "When disabled, the APM BIOS does not automatically
1803 power manage devices, enter the Standby State, enter the Suspend
1804 State, or take power saving steps in response to CPU Idle calls."
1805 This driver will make CPU Idle calls when Linux is idle (unless this
1806 feature is turned off -- see "Do CPU IDLE calls", below). This
1807 should always save battery power, but more complicated APM features
1808 will be dependent on your BIOS implementation. You may need to turn
1809 this option off if your computer hangs at boot time when using APM
1810 support, or if it beeps continuously instead of suspending. Turn
1811 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
1812 T400CDT. This is off by default since most machines do fine without
1813 this feature.
1814
1815config APM_CPU_IDLE
1816 bool "Make CPU Idle calls when idle"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001817 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001818 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
1819 On some machines, this can activate improved power savings, such as
1820 a slowed CPU clock rate, when the machine is idle. These idle calls
1821 are made after the idle loop has run for some length of time (e.g.,
1822 333 mS). On some machines, this will cause a hang at boot time or
1823 whenever the CPU becomes idle. (On machines with more than one CPU,
1824 this option does nothing.)
1825
1826config APM_DISPLAY_BLANK
1827 bool "Enable console blanking using APM"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001828 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001829 Enable console blanking using the APM. Some laptops can use this to
1830 turn off the LCD backlight when the screen blanker of the Linux
1831 virtual console blanks the screen. Note that this is only used by
1832 the virtual console screen blanker, and won't turn off the backlight
1833 when using the X Window system. This also doesn't have anything to
1834 do with your VESA-compliant power-saving monitor. Further, this
1835 option doesn't work for all laptops -- it might not turn off your
1836 backlight at all, or it might print a lot of errors to the console,
1837 especially if you are using gpm.
1838
1839config APM_ALLOW_INTS
1840 bool "Allow interrupts during APM BIOS calls"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001841 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001842 Normally we disable external interrupts while we are making calls to
1843 the APM BIOS as a measure to lessen the effects of a badly behaving
1844 BIOS implementation. The BIOS should reenable interrupts if it
1845 needs to. Unfortunately, some BIOSes do not -- especially those in
1846 many of the newer IBM Thinkpads. If you experience hangs when you
1847 suspend, try setting this to Y. Otherwise, say N.
1848
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001849endif # APM
1850
1851source "arch/x86/kernel/cpu/cpufreq/Kconfig"
1852
1853source "drivers/cpuidle/Kconfig"
1854
Andy Henroid27471fd2008-10-09 11:45:22 -07001855source "drivers/idle/Kconfig"
1856
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001857endmenu
1858
1859
1860menu "Bus options (PCI etc.)"
1861
1862config PCI
Ingo Molnar1ac97012008-05-19 14:10:14 +02001863 bool "PCI support"
Adrian Bunk1c858082008-01-30 13:32:32 +01001864 default y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001865 select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001866 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001867 Find out whether you have a PCI motherboard. PCI is the name of a
1868 bus system, i.e. the way the CPU talks to the other stuff inside
1869 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1870 VESA. If you have PCI, say Y, otherwise N.
1871
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001872choice
1873 prompt "PCI access mode"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001874 depends on X86_32 && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001875 default PCI_GOANY
1876 ---help---
1877 On PCI systems, the BIOS can be used to detect the PCI devices and
1878 determine their configuration. However, some old PCI motherboards
1879 have BIOS bugs and may crash if this is done. Also, some embedded
1880 PCI-based systems don't have any BIOS at all. Linux can also try to
1881 detect the PCI hardware directly without using the BIOS.
1882
1883 With this option, you can specify how Linux should detect the
1884 PCI devices. If you choose "BIOS", the BIOS will be used,
1885 if you choose "Direct", the BIOS won't be used, and if you
1886 choose "MMConfig", then PCI Express MMCONFIG will be used.
1887 If you choose "Any", the kernel will try MMCONFIG, then the
1888 direct access method and falls back to the BIOS if that doesn't
1889 work. If unsure, go with the default, which is "Any".
1890
1891config PCI_GOBIOS
1892 bool "BIOS"
1893
1894config PCI_GOMMCONFIG
1895 bool "MMConfig"
1896
1897config PCI_GODIRECT
1898 bool "Direct"
1899
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001900config PCI_GOOLPC
1901 bool "OLPC"
1902 depends on OLPC
1903
Andres Salomon2bdd1b02008-06-05 14:14:41 -07001904config PCI_GOANY
1905 bool "Any"
1906
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001907endchoice
1908
1909config PCI_BIOS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001910 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001911 depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001912
1913# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
1914config PCI_DIRECT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001915 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001916 depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001917
1918config PCI_MMCONFIG
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001919 def_bool y
Feng Tang5f0db7a2009-08-14 15:37:50 -04001920 depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001921
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001922config PCI_OLPC
Andres Salomon2bdd1b02008-06-05 14:14:41 -07001923 def_bool y
1924 depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001925
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001926config PCI_DOMAINS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001927 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001928 depends on PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001929
1930config PCI_MMCONFIG
1931 bool "Support mmconfig PCI config space access"
1932 depends on X86_64 && PCI && ACPI
1933
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07001934config PCI_CNB20LE_QUIRK
1935 bool "Read CNB20LE Host Bridge Windows"
1936 depends on PCI
1937 help
1938 Read the PCI windows out of the CNB20LE host bridge. This allows
1939 PCI hotplug to work on systems with the CNB20LE chipset which do
1940 not have ACPI.
1941
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001942config DMAR
1943 bool "Support for DMA Remapping Devices (EXPERIMENTAL)"
David Woodhouse4cf2e752009-02-11 17:23:43 +00001944 depends on PCI_MSI && ACPI && EXPERIMENTAL
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001945 help
1946 DMA remapping (DMAR) devices support enables independent address
1947 translations for Direct Memory Access (DMA) from devices.
1948 These DMA remapping devices are reported via ACPI tables
1949 and include PCI device scope covered by these DMA
1950 remapping devices.
1951
Kyle McMartin0cd5c3c2009-02-04 14:29:19 -08001952config DMAR_DEFAULT_ON
Kyle McMartinf6be37f2009-02-26 12:57:56 -05001953 def_bool y
Kyle McMartin0cd5c3c2009-02-04 14:29:19 -08001954 prompt "Enable DMA Remapping Devices by default"
1955 depends on DMAR
1956 help
1957 Selecting this option will enable a DMAR device at boot time if
1958 one is found. If this option is not selected, DMAR support can
1959 be enabled by passing intel_iommu=on to the kernel. It is
1960 recommended you say N here while the DMAR code remains
1961 experimental.
1962
David Woodhouse62edf5d2009-07-04 10:59:46 +01001963config DMAR_BROKEN_GFX_WA
1964 def_bool n
1965 prompt "Workaround broken graphics drivers (going away soon)"
David Woodhouse0c02a202009-09-19 09:37:23 -07001966 depends on DMAR && BROKEN
David Woodhouse62edf5d2009-07-04 10:59:46 +01001967 ---help---
1968 Current Graphics drivers tend to use physical address
1969 for DMA and avoid using DMA APIs. Setting this config
1970 option permits the IOMMU driver to set a unity map for
1971 all the OS-visible memory. Hence the driver can continue
1972 to use physical addresses for DMA, at least until this
1973 option is removed in the 2.6.32 kernel.
1974
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001975config DMAR_FLOPPY_WA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001976 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001977 depends on DMAR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001978 ---help---
David Woodhousec7ab48d2009-06-26 19:10:36 +01001979 Floppy disk drivers are known to bypass DMA API calls
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001980 thereby failing to work when IOMMU is enabled. This
1981 workaround will setup a 1:1 mapping for the first
David Woodhousec7ab48d2009-06-26 19:10:36 +01001982 16MiB to make floppy (an ISA device) work.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001983
Suresh Siddha9fa8c482008-07-10 11:17:00 -07001984config INTR_REMAP
1985 bool "Support for Interrupt Remapping (EXPERIMENTAL)"
1986 depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI && EXPERIMENTAL
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001987 ---help---
1988 Supports Interrupt remapping for IO-APIC and MSI devices.
1989 To use x2apic mode in the CPU's which support x2APIC enhancements or
1990 to support platforms with CPU's having > 8 bit APIC ID, say Y.
Suresh Siddha9fa8c482008-07-10 11:17:00 -07001991
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001992source "drivers/pci/pcie/Kconfig"
1993
1994source "drivers/pci/Kconfig"
1995
1996# x86_64 have no ISA slots, but do have ISA-style DMA.
1997config ISA_DMA_API
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001998 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001999
2000if X86_32
2001
2002config ISA
2003 bool "ISA support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002004 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002005 Find out whether you have ISA slots on your motherboard. ISA is the
2006 name of a bus system, i.e. the way the CPU talks to the other stuff
2007 inside your box. Other bus systems are PCI, EISA, MicroChannel
2008 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
2009 newer boards don't support it. If you have ISA, say Y, otherwise N.
2010
2011config EISA
2012 bool "EISA support"
2013 depends on ISA
2014 ---help---
2015 The Extended Industry Standard Architecture (EISA) bus was
2016 developed as an open alternative to the IBM MicroChannel bus.
2017
2018 The EISA bus provided some of the features of the IBM MicroChannel
2019 bus while maintaining backward compatibility with cards made for
2020 the older ISA bus. The EISA bus saw limited use between 1988 and
2021 1995 when it was made obsolete by the PCI bus.
2022
2023 Say Y here if you are building a kernel for an EISA-based machine.
2024
2025 Otherwise, say N.
2026
2027source "drivers/eisa/Kconfig"
2028
2029config MCA
Ingo Molnar72ee6eb2009-01-27 16:57:49 +01002030 bool "MCA support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002031 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002032 MicroChannel Architecture is found in some IBM PS/2 machines and
2033 laptops. It is a bus system similar to PCI or ISA. See
2034 <file:Documentation/mca.txt> (and especially the web page given
2035 there) before attempting to build an MCA bus kernel.
2036
2037source "drivers/mca/Kconfig"
2038
2039config SCx200
2040 tristate "NatSemi SCx200 support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002041 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002042 This provides basic support for National Semiconductor's
2043 (now AMD's) Geode processors. The driver probes for the
2044 PCI-IDs of several on-chip devices, so its a good dependency
2045 for other scx200_* drivers.
2046
2047 If compiled as a module, the driver is named scx200.
2048
2049config SCx200HR_TIMER
2050 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
2051 depends on SCx200 && GENERIC_TIME
2052 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002053 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002054 This driver provides a clocksource built upon the on-chip
2055 27MHz high-resolution timer. Its also a workaround for
2056 NSC Geode SC-1100's buggy TSC, which loses time when the
2057 processor goes idle (as is done by the scheduler). The
2058 other workaround is idle=poll boot option.
2059
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002060config OLPC
2061 bool "One Laptop Per Child support"
Andres Salomon3c554942009-12-14 18:00:36 -08002062 select GPIOLIB
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002063 default n
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002064 ---help---
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002065 Add support for detecting the unique features of the OLPC
2066 XO hardware.
2067
Sam Ravnborgbc0120f2007-11-06 23:10:39 +01002068endif # X86_32
2069
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002070config K8_NB
2071 def_bool y
Borislav Petkov0e152cd2010-03-12 15:43:03 +01002072 depends on CPU_SUP_AMD && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002073
2074source "drivers/pcmcia/Kconfig"
2075
2076source "drivers/pci/hotplug/Kconfig"
2077
2078endmenu
2079
2080
2081menu "Executable file formats / Emulations"
2082
2083source "fs/Kconfig.binfmt"
2084
2085config IA32_EMULATION
2086 bool "IA32 Emulation"
2087 depends on X86_64
Roland McGratha97f52e2008-01-30 13:31:55 +01002088 select COMPAT_BINFMT_ELF
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002089 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002090 Include code to run 32-bit programs under a 64-bit kernel. You should
2091 likely turn this on, unless you're 100% sure that you don't have any
2092 32-bit programs left.
2093
2094config IA32_AOUT
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002095 tristate "IA32 a.out support"
2096 depends on IA32_EMULATION
2097 ---help---
2098 Support old a.out binaries in the 32bit emulation.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002099
2100config COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002101 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002102 depends on IA32_EMULATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002103
2104config COMPAT_FOR_U64_ALIGNMENT
2105 def_bool COMPAT
2106 depends on X86_64
2107
2108config SYSVIPC_COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002109 def_bool y
Alexey Dobriyanb8992192008-09-14 13:44:41 +04002110 depends on COMPAT && SYSVIPC
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002111
2112endmenu
2113
2114
Keith Packarde5beae12008-11-03 18:21:45 +01002115config HAVE_ATOMIC_IOMAP
2116 def_bool y
2117 depends on X86_32
2118
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002119source "net/Kconfig"
2120
2121source "drivers/Kconfig"
2122
2123source "drivers/firmware/Kconfig"
2124
2125source "fs/Kconfig"
2126
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002127source "arch/x86/Kconfig.debug"
2128
2129source "security/Kconfig"
2130
2131source "crypto/Kconfig"
2132
Avi Kivityedf88412007-12-16 11:02:48 +02002133source "arch/x86/kvm/Kconfig"
2134
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002135source "lib/Kconfig"