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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 Carstensf850c30c2010-02-10 17:25:17 +010049 select HAVE_REGS_AND_STACK_ACCESS_API
Joerg Roedel2118d0c2009-01-09 15:13:15 +010050 select HAVE_DMA_API_DEBUG
H. Peter Anvin2e9f3bd2009-01-04 15:41:25 -080051 select HAVE_KERNEL_GZIP
52 select HAVE_KERNEL_BZIP2
53 select HAVE_KERNEL_LZMA
Albin Tonnerre13510992010-01-08 14:42:45 -080054 select HAVE_KERNEL_LZO
K.Prasad0067f122009-06-01 23:43:57 +053055 select HAVE_HW_BREAKPOINT
Frederic Weisbecker01027522010-04-11 18:55:56 +020056 select HAVE_MIXED_BREAKPOINTS_REGS
Frederic Weisbecker99e8c5a2009-12-17 01:33:54 +010057 select PERF_EVENTS
Frederic Weisbeckerc01d4322010-05-15 22:57:48 +020058 select HAVE_PERF_EVENTS_NMI
Frederic Weisbecker99e8c5a2009-12-17 01:33:54 +010059 select ANON_INODES
Pekka Enberg0a4af3b2009-02-26 21:38:56 +020060 select HAVE_ARCH_KMEMCHECK
Avi Kivity7c68af62009-09-19 09:40:22 +030061 select HAVE_USER_RETURN_NOTIFIER
Steven Rostedt46eb3b62010-09-22 23:10:23 -040062 select HAVE_ARCH_JUMP_LABEL
Balbir Singh7d8330a2008-02-10 12:46:28 +053063
Ingo Molnarba7e4d12009-06-06 13:58:12 +020064config INSTRUCTION_DECODER
65 def_bool (KPROBES || PERF_EVENTS)
66
Linus Torvalds51b26ad2009-04-26 10:12:47 -070067config OUTPUT_FORMAT
68 string
69 default "elf32-i386" if X86_32
70 default "elf64-x86-64" if X86_64
71
Sam Ravnborg73531902008-05-25 23:03:18 +020072config ARCH_DEFCONFIG
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +020073 string
Sam Ravnborg73531902008-05-25 23:03:18 +020074 default "arch/x86/configs/i386_defconfig" if X86_32
75 default "arch/x86/configs/x86_64_defconfig" if X86_64
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +020076
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010077config GENERIC_CMOS_UPDATE
Harvey Harrison3c2362e2008-01-30 13:31:03 +010078 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010079
80config CLOCKSOURCE_WATCHDOG
Harvey Harrison3c2362e2008-01-30 13:31:03 +010081 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010082
83config GENERIC_CLOCKEVENTS
Harvey Harrison3c2362e2008-01-30 13:31:03 +010084 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010085
86config GENERIC_CLOCKEVENTS_BROADCAST
Harvey Harrison3c2362e2008-01-30 13:31:03 +010087 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010088 depends on X86_64 || (X86_32 && X86_LOCAL_APIC)
89
90config LOCKDEP_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +010091 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010092
93config STACKTRACE_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +010094 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010095
Heiko Carstensaa7d9352008-02-01 17:45:14 +010096config HAVE_LATENCYTOP_SUPPORT
97 def_bool y
98
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010099config MMU
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100100 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100101
102config ZONE_DMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100103 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100104
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100105config SBUS
106 bool
107
FUJITA Tomonori3bc4e452010-03-10 15:23:22 -0800108config NEED_DMA_MAP_STATE
109 def_bool (X86_64 || DMAR || DMA_API_DEBUG)
110
FUJITA Tomonori18e98302010-05-26 14:44:32 -0700111config NEED_SG_DMA_LENGTH
Andrew Morton4a14d842010-05-26 14:44:33 -0700112 def_bool y
FUJITA Tomonori18e98302010-05-26 14:44:32 -0700113
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100114config GENERIC_ISA_DMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100115 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100116
117config GENERIC_IOMAP
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100118 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100119
120config GENERIC_BUG
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100121 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100122 depends on BUG
Jan Beulichb93a5312008-12-16 11:40:27 +0000123 select GENERIC_BUG_RELATIVE_POINTERS if X86_64
124
125config GENERIC_BUG_RELATIVE_POINTERS
126 bool
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100127
128config GENERIC_HWEIGHT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100129 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100130
Florian Fainellia6082952008-01-30 13:33:35 +0100131config GENERIC_GPIO
Jan Beulich9ba16082008-10-15 22:01:38 -0700132 bool
Florian Fainellia6082952008-01-30 13:33:35 +0100133
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100134config ARCH_MAY_HAVE_PC_FDC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100135 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100136
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100137config RWSEM_GENERIC_SPINLOCK
138 def_bool !X86_XADD
139
140config RWSEM_XCHGADD_ALGORITHM
141 def_bool X86_XADD
142
Venki Pallipadia6869cc2008-02-08 17:05:44 -0800143config ARCH_HAS_CPU_IDLE_WAIT
144 def_bool y
145
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100146config GENERIC_CALIBRATE_DELAY
147 def_bool y
148
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100149config GENERIC_TIME_VSYSCALL
150 bool
151 default X86_64
152
venkatesh.pallipadi@intel.com9a0b8412008-01-31 17:35:06 -0800153config ARCH_HAS_CPU_RELAX
154 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100155
Venkatesh Pallipadi89cedfe2008-10-16 19:00:08 -0400156config ARCH_HAS_DEFAULT_IDLE
157 def_bool y
158
Pekka Enberg1b27d052008-04-28 02:12:22 -0700159config ARCH_HAS_CACHE_LINE_SIZE
160 def_bool y
161
Mike Travisdd5af902008-01-30 13:33:32 +0100162config HAVE_SETUP_PER_CPU_AREA
Brian Gerst89c9c4c2009-01-27 12:56:48 +0900163 def_bool y
travis@sgi.comb32ef632008-01-30 13:32:51 +0100164
Tejun Heo08fc4582009-08-14 15:00:49 +0900165config NEED_PER_CPU_EMBED_FIRST_CHUNK
166 def_bool y
167
168config NEED_PER_CPU_PAGE_FIRST_CHUNK
Tejun Heo11124412009-02-20 16:29:09 +0900169 def_bool y
170
Mike Travis9f0e8d02008-04-04 18:11:01 -0700171config HAVE_CPUMASK_OF_CPU_MAP
172 def_bool X86_64_SMP
173
Johannes Berg801e4062007-12-08 02:12:39 +0100174config ARCH_HIBERNATION_POSSIBLE
175 def_bool y
Johannes Berg801e4062007-12-08 02:12:39 +0100176
Johannes Bergf4cb5702007-12-08 02:14:00 +0100177config ARCH_SUSPEND_POSSIBLE
178 def_bool y
Johannes Bergf4cb5702007-12-08 02:14:00 +0100179
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100180config ZONE_DMA32
181 bool
182 default X86_64
183
184config ARCH_POPULATES_NODE_MAP
185 def_bool y
186
187config AUDIT_ARCH
188 bool
189 default X86_64
190
Ingo Molnar765c68b2008-04-09 11:03:37 +0200191config ARCH_SUPPORTS_OPTIMIZED_INLINING
192 def_bool y
193
Akinobu Mita6a11f752009-03-31 15:23:17 -0700194config ARCH_SUPPORTS_DEBUG_PAGEALLOC
195 def_bool y
196
Yinghai Lu580e0ad2010-02-16 18:40:35 -0800197config HAVE_EARLY_RES
198 def_bool y
199
Shane Wang69575d32009-09-01 18:25:07 -0700200config HAVE_INTEL_TXT
201 def_bool y
202 depends on EXPERIMENTAL && DMAR && ACPI
203
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100204# Use the generic interrupt handling code in kernel/irq/:
205config GENERIC_HARDIRQS
Jan Beulich6fc108a2010-04-21 15:23:44 +0100206 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100207
Thomas Gleixnerf9a36fa2009-03-13 16:37:48 +0100208config GENERIC_HARDIRQS_NO__DO_IRQ
209 def_bool y
210
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100211config GENERIC_IRQ_PROBE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100212 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100213
214config GENERIC_PENDING_IRQ
Jan Beulich6fc108a2010-04-21 15:23:44 +0100215 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100216 depends on GENERIC_HARDIRQS && SMP
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100217
James Bottomley6cd10f82008-11-09 11:53:14 -0600218config USE_GENERIC_SMP_HELPERS
219 def_bool y
220 depends on SMP
221
Sam Ravnborg6b0c3d42008-01-30 13:32:27 +0100222config X86_32_SMP
223 def_bool y
224 depends on X86_32 && SMP
225
226config X86_64_SMP
227 def_bool y
228 depends on X86_64 && SMP
229
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100230config X86_HT
Jan Beulich6fc108a2010-04-21 15:23:44 +0100231 def_bool y
Adrian Bunkee0011a2007-12-04 17:19:07 +0100232 depends on SMP
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100233
234config X86_TRAMPOLINE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100235 def_bool y
Ingo Molnar3e5095d2009-01-27 17:07:08 +0100236 depends on SMP || (64BIT && ACPI_SLEEP)
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100237
Tejun Heoccbeed32009-02-09 22:17:40 +0900238config X86_32_LAZY_GS
239 def_bool y
Tejun Heo60a53172009-02-09 22:17:40 +0900240 depends on X86_32 && !CC_STACKPROTECTOR
Tejun Heoccbeed32009-02-09 22:17:40 +0900241
Borislav Petkovd61931d2010-03-05 17:34:46 +0100242config ARCH_HWEIGHT_CFLAGS
243 string
244 default "-fcall-saved-ecx -fcall-saved-edx" if X86_32
245 default "-fcall-saved-rdi -fcall-saved-rsi -fcall-saved-rdx -fcall-saved-rcx -fcall-saved-r8 -fcall-saved-r9 -fcall-saved-r10 -fcall-saved-r11" if X86_64
246
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100247config KTIME_SCALAR
248 def_bool X86_32
Borislav Petkovd7c53c92010-08-19 20:10:29 +0200249
250config ARCH_CPU_PROBE_RELEASE
251 def_bool y
252 depends on HOTPLUG_CPU
253
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100254source "init/Kconfig"
Matt Helsleydc52ddc2008-10-18 20:27:21 -0700255source "kernel/Kconfig.freezer"
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100256
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100257menu "Processor type and features"
258
259source "kernel/time/Kconfig"
260
261config SMP
262 bool "Symmetric multi-processing support"
263 ---help---
264 This enables support for systems with more than one CPU. If you have
265 a system with only one CPU, like most personal computers, say N. If
266 you have a system with more than one CPU, say Y.
267
268 If you say N here, the kernel will run on single and multiprocessor
269 machines, but will use only one CPU of a multiprocessor machine. If
270 you say Y here, the kernel will run on many, but not all,
271 singleprocessor machines. On a singleprocessor machine, the kernel
272 will run faster if you say N here.
273
274 Note that if you say Y here and choose architecture "586" or
275 "Pentium" under "Processor family", the kernel will not work on 486
276 architectures. Similarly, multiprocessor kernels for the "PPro"
277 architecture may not work on all Pentium based boards.
278
279 People using multiprocessor machines who say Y here should also say
280 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
281 Management" code will be disabled if you say Y here.
282
Adrian Bunk03502fa2008-02-03 15:50:21 +0200283 See also <file:Documentation/i386/IO-APIC.txt>,
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100284 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
285 <http://www.tldp.org/docs.html#howto>.
286
287 If you don't know what to do here, say N.
288
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800289config X86_X2APIC
290 bool "Support x2apic"
David Woodhousef7d7f862009-04-06 23:04:40 -0700291 depends on X86_LOCAL_APIC && X86_64 && INTR_REMAP
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800292 ---help---
293 This enables x2apic support on CPUs that have this feature.
294
295 This allows 32-bit apic IDs (so it can support very large systems),
296 and accesses the local apic via MSRs not via mmio.
297
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800298 If you don't know what to do here, say N.
299
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800300config SPARSE_IRQ
301 bool "Support sparse irq numbering"
Yinghai Lu17483a12008-12-12 13:14:18 -0800302 depends on PCI_MSI || HT_IRQ
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100303 ---help---
Ingo Molnar973656f2008-12-25 16:26:47 +0100304 This enables support for sparse irqs. This is useful for distro
305 kernels that want to define a high CONFIG_NR_CPUS value but still
306 want to have low kernel memory footprint on smaller machines.
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800307
Ingo Molnar973656f2008-12-25 16:26:47 +0100308 ( Sparse IRQs can also be beneficial on NUMA boxes, as they spread
309 out the irq_desc[] array in a more NUMA-friendly way. )
310
311 If you don't know what to do here, say N.
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800312
Yinghai Lu15e957d2009-04-30 01:17:50 -0700313config NUMA_IRQ_DESC
314 def_bool y
Yinghai Lub9098952008-12-19 13:48:34 -0800315 depends on SPARSE_IRQ && NUMA
Yinghai Lu48a1b102008-12-11 00:15:01 -0800316
Yinghai Lu6695c852008-06-19 12:13:09 -0700317config X86_MPPARSE
Jan Beulich7a527682008-10-30 10:38:24 +0000318 bool "Enable MPS table" if ACPI
319 default y
Ingo Molnar5ab74722008-07-10 14:42:03 +0200320 depends on X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100321 ---help---
Yinghai Lu6695c852008-06-19 12:13:09 -0700322 For old smp systems that do not have proper acpi support. Newer systems
323 (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
Yinghai Lu6695c852008-06-19 12:13:09 -0700324
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800325config X86_BIGSMP
326 bool "Support for big SMP systems with more than 8 CPUs"
327 depends on X86_32 && SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100328 ---help---
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800329 This option is needed for the systems that have more than 8 CPUs
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100330
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800331if X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800332config X86_EXTENDED_PLATFORM
333 bool "Support for extended (non-PC) x86 platforms"
334 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100335 ---help---
Ingo Molnar06ac8342009-01-27 18:11:43 +0100336 If you disable this option then the kernel will only support
337 standard PC platforms. (which covers the vast majority of
338 systems out there.)
339
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800340 If you enable this option then you'll be able to select support
341 for the following (non-PC) 32 bit x86 platforms:
342 AMD Elan
343 NUMAQ (IBM/Sequent)
344 RDC R-321x SoC
345 SGI 320/540 (Visual Workstation)
346 Summit/EXA (IBM x440)
347 Unisys ES7000 IA32 series
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200348 Moorestown MID devices
Ingo Molnar06ac8342009-01-27 18:11:43 +0100349
350 If you have one of these systems, or if you want to build a
351 generic distribution kernel, say Y here - otherwise say N.
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800352endif
Ingo Molnar06ac8342009-01-27 18:11:43 +0100353
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800354if X86_64
355config X86_EXTENDED_PLATFORM
356 bool "Support for extended (non-PC) x86 platforms"
357 default y
358 ---help---
359 If you disable this option then the kernel will only support
360 standard PC platforms. (which covers the vast majority of
361 systems out there.)
362
363 If you enable this option then you'll be able to select support
364 for the following (non-PC) 64 bit x86 platforms:
365 ScaleMP vSMP
366 SGI Ultraviolet
367
368 If you have one of these systems, or if you want to build a
369 generic distribution kernel, say Y here - otherwise say N.
370endif
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800371# This is an alphabetically sorted list of 64 bit extended platforms
372# Please maintain the alphabetic order if and when there are additions
Nick Piggin03b48632009-01-20 04:36:04 +0100373
Ingo Molnar6a485652009-01-27 18:29:13 +0100374config X86_VSMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800375 bool "ScaleMP vSMP"
Ingo Molnar6a485652009-01-27 18:29:13 +0100376 select PARAVIRT
377 depends on X86_64 && PCI
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800378 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100379 ---help---
Ingo Molnar6a485652009-01-27 18:29:13 +0100380 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
381 supposed to run on these EM64T-based machines. Only choose this option
382 if you have one of these machines.
383
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800384config X86_UV
385 bool "SGI Ultraviolet"
386 depends on X86_64
387 depends on X86_EXTENDED_PLATFORM
Jack Steiner54c28d22009-04-03 15:39:42 -0500388 depends on NUMA
Suresh Siddha9d6c26e2009-04-20 13:02:31 -0700389 depends on X86_X2APIC
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800390 ---help---
391 This option is needed in order to support SGI Ultraviolet systems.
392 If you don't have one of these, you should say N here.
393
394# Following is an alphabetically sorted list of 32 bit extended platforms
395# Please maintain the alphabetic order if and when there are additions
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100396
397config X86_ELAN
398 bool "AMD Elan"
399 depends on X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800400 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100401 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100402 Select this for an AMD Elan processor.
403
404 Do not use this option for K6/Athlon/Opteron processors!
405
406 If unsure, choose "PC-compatible" instead.
407
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200408config X86_MRST
409 bool "Moorestown MID platform"
Jacob Pan4b2f3f72010-02-25 10:02:14 -0800410 depends on PCI
411 depends on PCI_GOANY
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200412 depends on X86_32
413 depends on X86_EXTENDED_PLATFORM
Jacob Pan4b2f3f72010-02-25 10:02:14 -0800414 depends on X86_IO_APIC
Jacob Panbb24c472009-09-02 07:37:17 -0700415 select APB_TIMER
Thomas Gleixner3f4110a2009-08-29 14:54:20 +0200416 ---help---
417 Moorestown is Intel's Low Power Intel Architecture (LPIA) based Moblin
418 Internet Device(MID) platform. Moorestown consists of two chips:
419 Lincroft (CPU core, graphics, and memory controller) and Langwell IOH.
420 Unlike standard x86 PCs, Moorestown does not have many legacy devices
421 nor standard legacy replacement devices/features. e.g. Moorestown does
422 not contain i8259, i8254, HPET, legacy BIOS, most of the io ports.
423
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800424config X86_RDC321X
425 bool "RDC R-321x SoC"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100426 depends on X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800427 depends on X86_EXTENDED_PLATFORM
428 select M486
429 select X86_REBOOTFIXUPS
430 ---help---
431 This option is needed for RDC R-321x system-on-chip, also known
432 as R-8610-(G).
433 If you don't have one of these chips, you should say N here.
434
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100435config X86_32_NON_STANDARD
Ingo Molnar9c398012009-01-27 18:24:57 +0100436 bool "Support non-standard 32-bit SMP architectures"
437 depends on X86_32 && SMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800438 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100439 ---help---
440 This option compiles in the NUMAQ, Summit, bigsmp, ES7000, default
Yinghai Lud49c4282008-06-08 18:31:54 -0700441 subarchitectures. It is intended for a generic binary kernel.
442 if you select them all, kernel will probe it one by one. and will
443 fallback to default.
444
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800445# Alphabetically sorted list of Non standard 32 bit platforms
Yinghai Lud49c4282008-06-08 18:31:54 -0700446
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100447config X86_NUMAQ
448 bool "NUMAQ (IBM/Sequent)"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100449 depends on X86_32_NON_STANDARD
Pan, Jacob juna92d1522010-02-24 16:59:55 -0800450 depends on PCI
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100451 select NUMA
Ingo Molnar9c398012009-01-27 18:24:57 +0100452 select X86_MPPARSE
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100453 ---help---
Yinghai Lud49c4282008-06-08 18:31:54 -0700454 This option is used for getting Linux to run on a NUMAQ (IBM/Sequent)
455 NUMA multiquad box. This changes the way that processors are
456 bootstrapped, and uses Clustered Logical APIC addressing mode instead
457 of Flat Logical. You will need a new lynxer.elf file to flash your
458 firmware with - send email to <Martin.Bligh@us.ibm.com>.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100459
Linus Torvaldsd949f362009-09-26 09:35:07 -0700460config X86_SUPPORTS_MEMORY_FAILURE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100461 def_bool y
Linus Torvaldsd949f362009-09-26 09:35:07 -0700462 # MCE code calls memory_failure():
463 depends on X86_MCE
464 # On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
465 depends on !X86_NUMAQ
466 # On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
467 depends on X86_64 || !SPARSEMEM
468 select ARCH_SUPPORTS_MEMORY_FAILURE
Linus Torvaldsd949f362009-09-26 09:35:07 -0700469
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200470config X86_VISWS
471 bool "SGI 320/540 (Visual Workstation)"
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800472 depends on X86_32 && PCI && X86_MPPARSE && PCI_GODIRECT
473 depends on X86_32_NON_STANDARD
474 ---help---
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200475 The SGI Visual Workstation series is an IA32-based workstation
476 based on SGI systems chips with some legacy PC hardware attached.
477
478 Say Y here to create a kernel to run on the SGI 320 or 540.
479
480 A kernel compiled for the Visual Workstation will run on general
481 PCs as well. See <file:Documentation/sgi-visws.txt> for details.
482
Ingo Molnar9c398012009-01-27 18:24:57 +0100483config X86_SUMMIT
484 bool "Summit/EXA (IBM x440)"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100485 depends on X86_32_NON_STANDARD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100486 ---help---
Ingo Molnar9c398012009-01-27 18:24:57 +0100487 This option is needed for IBM systems that use the Summit/EXA chipset.
488 In particular, it is needed for the x440.
Ingo Molnar1f972762008-07-26 13:52:50 +0200489
Ingo Molnar9c398012009-01-27 18:24:57 +0100490config X86_ES7000
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800491 bool "Unisys ES7000 IA32 series"
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800492 depends on X86_32_NON_STANDARD && X86_BIGSMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100493 ---help---
Ingo Molnar9c398012009-01-27 18:24:57 +0100494 Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
495 supposed to run on an IA32-based Unisys ES7000 system.
496
Ingo Molnarae1e9132008-11-11 09:05:16 +0100497config SCHED_OMIT_FRAME_POINTER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100498 def_bool y
499 prompt "Single-depth WCHAN output"
Ken Chena87d0912008-11-06 11:10:49 -0800500 depends on X86
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100501 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100502 Calculate simpler /proc/<PID>/wchan values. If this option
503 is disabled then wchan values will recurse back to the
504 caller function. This provides more accurate wchan values,
505 at the expense of slightly more scheduling overhead.
506
507 If in doubt, say "Y".
508
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100509menuconfig PARAVIRT_GUEST
510 bool "Paravirtualized guest support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100511 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100512 Say Y here to get to see options related to running Linux under
513 various hypervisors. This option alone does not add any kernel code.
514
515 If you say N, all options in this submenu will be skipped and disabled.
516
517if PARAVIRT_GUEST
518
519source "arch/x86/xen/Kconfig"
520
521config VMI
Alok Katariad0153ca2009-09-29 10:25:24 -0700522 bool "VMI Guest support (DEPRECATED)"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100523 select PARAVIRT
Eduardo Pereira Habkost42d545c2008-01-30 13:33:32 +0100524 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100525 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100526 VMI provides a paravirtualized interface to the VMware ESX server
527 (it could be used by other hypervisors in theory too, but is not
528 at the moment), by linking the kernel to a GPL-ed ROM module
529 provided by the hypervisor.
530
Alok Katariad0153ca2009-09-29 10:25:24 -0700531 As of September 2009, VMware has started a phased retirement
532 of this feature from VMware's products. Please see
533 feature-removal-schedule.txt for details. If you are
534 planning to enable this option, please note that you cannot
535 live migrate a VMI enabled VM to a future VMware product,
536 which doesn't support VMI. So if you expect your kernel to
537 seamlessly migrate to newer VMware products, keep this
538 disabled.
539
Glauber de Oliveira Costa790c73f2008-02-15 17:52:48 -0200540config KVM_CLOCK
541 bool "KVM paravirtualized clock"
542 select PARAVIRT
Gerd Hoffmannf6e16d52008-06-03 16:17:32 +0200543 select PARAVIRT_CLOCK
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100544 ---help---
Glauber de Oliveira Costa790c73f2008-02-15 17:52:48 -0200545 Turning on this option will allow you to run a paravirtualized clock
546 when running over the KVM hypervisor. Instead of relying on a PIT
547 (or probably other) emulation by the underlying device model, the host
548 provides the guest with timing infrastructure such as time of day, and
549 system time
550
Marcelo Tosatti0cf1bfd2008-02-22 12:21:36 -0500551config KVM_GUEST
552 bool "KVM Guest support"
553 select PARAVIRT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100554 ---help---
555 This option enables various optimizations for running under the KVM
556 hypervisor.
Marcelo Tosatti0cf1bfd2008-02-22 12:21:36 -0500557
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100558source "arch/x86/lguest/Kconfig"
559
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100560config PARAVIRT
561 bool "Enable paravirtualization code"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100562 ---help---
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100563 This changes the kernel so it can modify itself when it is run
564 under a hypervisor, potentially improving performance significantly
565 over full virtualization. However, when run without a hypervisor
566 the kernel is theoretically slower and slightly larger.
567
Jeremy Fitzhardingeb4ecc122009-05-13 17:16:55 -0700568config PARAVIRT_SPINLOCKS
569 bool "Paravirtualization layer for spinlocks"
570 depends on PARAVIRT && SMP && EXPERIMENTAL
571 ---help---
572 Paravirtualized spinlocks allow a pvops backend to replace the
573 spinlock implementation with something virtualization-friendly
574 (for example, block the virtual CPU rather than spinning).
575
576 Unfortunately the downside is an up to 5% performance hit on
577 native kernels, with various workloads.
578
579 If you are unsure how to answer this question, answer N.
580
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200581config PARAVIRT_CLOCK
582 bool
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200583
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100584endif
585
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400586config PARAVIRT_DEBUG
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100587 bool "paravirt-ops debugging"
588 depends on PARAVIRT && DEBUG_KERNEL
589 ---help---
590 Enable to debug paravirt_ops internals. Specifically, BUG if
591 a paravirt_op is missing when it is called.
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400592
Yinghai Lu08677212010-02-10 01:20:20 -0800593config NO_BOOTMEM
594 default y
595 bool "Disable Bootmem code"
Yinghai Lu08677212010-02-10 01:20:20 -0800596 ---help---
597 Use early_res directly instead of bootmem before slab is ready.
598 - allocator (buddy) [generic]
599 - early allocator (bootmem) [generic]
600 - very early allocator (reserve_early*()) [x86]
601 - very very early allocator (early brk model) [x86]
602 So reduce one layer between early allocator to final allocator
603
604
Yinghai Lu03273182008-04-18 17:49:15 -0700605config MEMTEST
606 bool "Memtest"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100607 ---help---
Yinghai Luc64df702008-03-21 18:56:19 -0700608 This option adds a kernel parameter 'memtest', which allows memtest
Yinghai Lu03273182008-04-18 17:49:15 -0700609 to be set.
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100610 memtest=0, mean disabled; -- default
611 memtest=1, mean do 1 test pattern;
612 ...
613 memtest=4, mean do 4 test patterns.
Thomas Gleixneraba37282008-07-15 14:48:48 +0200614 If you are unsure how to answer this question, answer N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100615
616config X86_SUMMIT_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100617 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100618 depends on X86_32 && NUMA && X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100619
620config X86_CYCLONE_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100621 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100622 depends on X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100623
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100624source "arch/x86/Kconfig.cpu"
625
626config HPET_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100627 def_bool X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100628 prompt "HPET Timer Support" if X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100629 ---help---
630 Use the IA-PC HPET (High Precision Event Timer) to manage
631 time in preference to the PIT and RTC, if a HPET is
632 present.
633 HPET is the next generation timer replacing legacy 8254s.
634 The HPET provides a stable time base on SMP
635 systems, unlike the TSC, but it is more expensive to access,
636 as it is off-chip. You can find the HPET spec at
637 <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100638
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100639 You can safely choose Y here. However, HPET will only be
640 activated if the platform and the BIOS support this feature.
641 Otherwise the 8254 will be used for timing services.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100642
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100643 Choose N to continue using the legacy 8254 timer.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100644
645config HPET_EMULATE_RTC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100646 def_bool y
Bernhard Walle9d8af782008-02-06 01:38:52 -0800647 depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100648
Jacob Panbb24c472009-09-02 07:37:17 -0700649config APB_TIMER
650 def_bool y if MRST
651 prompt "Langwell APB Timer Support" if X86_MRST
652 help
653 APB timer is the replacement for 8254, HPET on X86 MID platforms.
654 The APBT provides a stable time base on SMP
655 systems, unlike the TSC, but it is more expensive to access,
656 as it is off-chip. APB timers are always running regardless of CPU
657 C states, they are used as per CPU clockevent device when possible.
658
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100659# Mark as embedded because too many people got it wrong.
660# The code disables itself when not needed.
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700661config DMI
662 default y
663 bool "Enable DMI scanning" if EMBEDDED
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100664 ---help---
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700665 Enabled scanning of DMI to identify machine quirks. Say Y
666 here unless you have verified that your setup is not
667 affected by entries in the DMI blacklist. Required by PNP
668 BIOS code.
669
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100670config GART_IOMMU
671 bool "GART IOMMU support" if EMBEDDED
672 default y
673 select SWIOTLB
Borislav Petkov0e152cd2010-03-12 15:43:03 +0100674 depends on X86_64 && PCI && K8_NB
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100675 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100676 Support for full DMA access of devices with 32bit memory access only
677 on systems with more than 3GB. This is usually needed for USB,
678 sound, many IDE/SATA chipsets and some other devices.
679 Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
680 based hardware IOMMU and a software bounce buffer based IOMMU used
681 on Intel systems and as fallback.
682 The code is only active when needed (enough memory and limited
683 device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
684 too.
685
686config CALGARY_IOMMU
687 bool "IBM Calgary IOMMU support"
688 select SWIOTLB
689 depends on X86_64 && PCI && EXPERIMENTAL
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100690 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100691 Support for hardware IOMMUs in IBM's xSeries x366 and x460
692 systems. Needed to run systems with more than 3GB of memory
693 properly with 32-bit PCI devices that do not support DAC
694 (Double Address Cycle). Calgary also supports bus level
695 isolation, where all DMAs pass through the IOMMU. This
696 prevents them from going anywhere except their intended
697 destination. This catches hard-to-find kernel bugs and
698 mis-behaving drivers and devices that do not use the DMA-API
699 properly to set up their DMA buffers. The IOMMU can be
700 turned off at boot time with the iommu=off parameter.
701 Normally the kernel will make the right choice by itself.
702 If unsure, say Y.
703
704config CALGARY_IOMMU_ENABLED_BY_DEFAULT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100705 def_bool y
706 prompt "Should Calgary be enabled by default?"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100707 depends on CALGARY_IOMMU
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100708 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100709 Should Calgary be enabled by default? if you choose 'y', Calgary
710 will be used (if it exists). If you choose 'n', Calgary will not be
711 used even if it exists. If you choose 'n' and would like to use
712 Calgary anyway, pass 'iommu=calgary' on the kernel command line.
713 If unsure, say Y.
714
Joerg Roedel2b188722008-06-26 21:27:37 +0200715config AMD_IOMMU
716 bool "AMD IOMMU support"
Ingo Molnar07c40e82008-06-27 11:31:28 +0200717 select SWIOTLB
Joerg Roedela80dc3e2008-09-11 16:51:41 +0200718 select PCI_MSI
Ingo Molnar24d2ba02008-06-27 10:37:03 +0200719 depends on X86_64 && PCI && ACPI
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100720 ---help---
Joerg Roedel18d22202008-07-03 19:35:06 +0200721 With this option you can enable support for AMD IOMMU hardware in
722 your system. An IOMMU is a hardware component which provides
723 remapping of DMA memory accesses from devices. With an AMD IOMMU you
724 can isolate the the DMA memory of different devices and protect the
725 system from misbehaving device drivers or hardware.
726
727 You can find out if your system has an AMD IOMMU if you look into
728 your BIOS for an option to enable it or if you have an IVRS ACPI
729 table.
Joerg Roedel2b188722008-06-26 21:27:37 +0200730
Joerg Roedel2e117602008-12-11 19:00:12 +0100731config AMD_IOMMU_STATS
732 bool "Export AMD IOMMU statistics to debugfs"
733 depends on AMD_IOMMU
734 select DEBUG_FS
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100735 ---help---
Joerg Roedel2e117602008-12-11 19:00:12 +0100736 This option enables code in the AMD IOMMU driver to collect various
737 statistics about whats happening in the driver and exports that
738 information to userspace via debugfs.
739 If unsure, say N.
740
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100741# need this always selected by IOMMU for the VIA workaround
742config SWIOTLB
Joerg Roedela1afd012008-11-18 12:44:21 +0100743 def_bool y if X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100744 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100745 Support for software bounce buffers used on x86-64 systems
746 which don't have a hardware IOMMU (e.g. the current generation
747 of Intel's x86-64 CPUs). Using this PCI devices which can only
748 access 32-bits of memory can be used on systems with more than
749 3 GB of memory. If unsure, say Y.
750
FUJITA Tomonoria8522502008-04-29 00:59:36 -0700751config IOMMU_HELPER
FUJITA Tomonori18b743d2008-07-10 09:50:50 +0900752 def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU)
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700753
Joerg Roedel1aaf1182008-11-26 17:25:13 +0100754config IOMMU_API
755 def_bool (AMD_IOMMU || DMAR)
756
Mike Travis1184dc22008-05-12 21:21:12 +0200757config MAXSMP
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200758 bool "Enable Maximum number of SMP Processors and NUMA Nodes"
Mike Travis36f51012008-12-16 17:33:51 -0800759 depends on X86_64 && SMP && DEBUG_KERNEL && EXPERIMENTAL
760 select CPUMASK_OFFSTACK
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100761 ---help---
Samuel Thibaultddb0c5a2010-08-21 21:32:41 +0200762 Enable maximum number of CPUS and NUMA Nodes for this architecture.
Mike Travis1184dc22008-05-12 21:21:12 +0200763 If unsure, say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100764
765config NR_CPUS
Mike Travis36f51012008-12-16 17:33:51 -0800766 int "Maximum number of CPUs" if SMP && !MAXSMP
Michael K. Johnson2a3313f2009-04-21 21:44:48 -0400767 range 2 8 if SMP && X86_32 && !X86_BIGSMP
Mike Travis36f51012008-12-16 17:33:51 -0800768 range 2 512 if SMP && !MAXSMP
Mike Travis78637a972008-12-16 17:34:00 -0800769 default "1" if !SMP
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700770 default "4096" if MAXSMP
Mike Travis78637a972008-12-16 17:34:00 -0800771 default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000)
772 default "8" if SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100773 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100774 This allows you to specify the maximum number of CPUs which this
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700775 kernel will support. The maximum supported value is 512 and the
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100776 minimum value which makes sense is 2.
777
778 This is purely to save memory - each supported CPU adds
779 approximately eight kilobytes to the kernel image.
780
781config SCHED_SMT
782 bool "SMT (Hyperthreading) scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800783 depends on X86_HT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100784 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100785 SMT scheduler support improves the CPU scheduler's decision making
786 when dealing with Intel Pentium 4 chips with HyperThreading at a
787 cost of slightly increased overhead in some places. If unsure say
788 N here.
789
790config SCHED_MC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100791 def_bool y
792 prompt "Multi-core scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800793 depends on X86_HT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100794 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100795 Multi-core scheduler support improves the CPU scheduler's decision
796 making when dealing with multi-core CPU chips at a cost of slightly
797 increased overhead in some places. If unsure say N here.
798
799source "kernel/Kconfig.preempt"
800
801config X86_UP_APIC
802 bool "Local APIC support on uniprocessors"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100803 depends on X86_32 && !SMP && !X86_32_NON_STANDARD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100804 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100805 A local APIC (Advanced Programmable Interrupt Controller) is an
806 integrated interrupt controller in the CPU. If you have a single-CPU
807 system which has a processor with a local APIC, you can say Y here to
808 enable and use it. If you say Y here even though your machine doesn't
809 have a local APIC, then the kernel will still run with no slowdown at
810 all. The local APIC supports CPU-generated self-interrupts (timer,
811 performance counters), and the NMI watchdog which detects hard
812 lockups.
813
814config X86_UP_IOAPIC
815 bool "IO-APIC support on uniprocessors"
816 depends on X86_UP_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100817 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100818 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
819 SMP-capable replacement for PC-style interrupt controllers. Most
820 SMP systems and many recent uniprocessor systems have one.
821
822 If you have a single-CPU system with an IO-APIC, you can say Y here
823 to use it. If you say Y here even though your machine doesn't have
824 an IO-APIC, then the kernel will still run with no slowdown at all.
825
826config X86_LOCAL_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100827 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100828 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100829
830config X86_IO_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100831 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100832 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100833
834config X86_VISWS_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100835 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100836 depends on X86_32 && X86_VISWS
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100837
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200838config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
839 bool "Reroute for broken boot IRQs"
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200840 depends on X86_IO_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100841 ---help---
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200842 This option enables a workaround that fixes a source of
843 spurious interrupts. This is recommended when threaded
844 interrupt handling is used on systems where the generation of
845 superfluous "boot interrupts" cannot be disabled.
846
847 Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
848 entry in the chipset's IO-APIC is masked (as, e.g. the RT
849 kernel does during interrupt handling). On chipsets where this
850 boot IRQ generation cannot be disabled, this workaround keeps
851 the original IRQ line masked so that only the equivalent "boot
852 IRQ" is delivered to the CPUs. The workaround also tells the
853 kernel to set up the IRQ handler on the boot IRQ line. In this
854 way only one interrupt is delivered to the kernel. Otherwise
855 the spurious second interrupt may cause the kernel to bring
856 down (vital) interrupt lines.
857
858 Only affects "broken" chipsets. Interrupt sharing may be
859 increased on these systems.
860
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100861config X86_MCE
Andi Kleenbab9bc62009-07-09 00:31:38 +0200862 bool "Machine Check / overheating reporting"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100863 ---help---
Andi Kleenbab9bc62009-07-09 00:31:38 +0200864 Machine Check support allows the processor to notify the
865 kernel if it detects a problem (e.g. overheating, data corruption).
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100866 The action the kernel takes depends on the severity of the problem,
Andi Kleenbab9bc62009-07-09 00:31:38 +0200867 ranging from warning messages to halting the machine.
Andi Kleen4efc0672009-04-28 19:07:31 +0200868
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100869config X86_MCE_INTEL
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100870 def_bool y
871 prompt "Intel MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +0200872 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100873 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100874 Additional support for intel specific MCE features such as
875 the thermal monitor.
876
877config X86_MCE_AMD
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100878 def_bool y
879 prompt "AMD MCE features"
Andi Kleenc1ebf832009-07-09 00:31:41 +0200880 depends on X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100881 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100882 Additional support for AMD specific MCE features such as
883 the DRAM Error Threshold.
884
Andi Kleen4efc0672009-04-28 19:07:31 +0200885config X86_ANCIENT_MCE
Jan Beulich6fc108a2010-04-21 15:23:44 +0100886 bool "Support for old Pentium 5 / WinChip machine checks"
Andi Kleenc31d9632009-07-09 00:31:37 +0200887 depends on X86_32 && X86_MCE
Hidetoshi Setocd13adcc2009-05-27 16:57:31 +0900888 ---help---
889 Include support for machine check handling on old Pentium 5 or WinChip
890 systems. These typically need to be enabled explicitely on the command
891 line.
Andi Kleen4efc0672009-04-28 19:07:31 +0200892
Andi Kleenb2762682009-02-12 13:49:31 +0100893config X86_MCE_THRESHOLD
894 depends on X86_MCE_AMD || X86_MCE_INTEL
Jan Beulich6fc108a2010-04-21 15:23:44 +0100895 def_bool y
Andi Kleenb2762682009-02-12 13:49:31 +0100896
Andi Kleenea149b32009-04-29 19:31:00 +0200897config X86_MCE_INJECT
Andi Kleenc1ebf832009-07-09 00:31:41 +0200898 depends on X86_MCE
Andi Kleenea149b32009-04-29 19:31:00 +0200899 tristate "Machine check injector support"
900 ---help---
901 Provide support for injecting machine checks for testing purposes.
902 If you don't know what a machine check is and you don't do kernel
903 QA it is safe to say n.
904
Andi Kleen4efc0672009-04-28 19:07:31 +0200905config X86_THERMAL_VECTOR
906 def_bool y
Andi Kleen5bb38ad2009-07-09 00:31:39 +0200907 depends on X86_MCE_INTEL
Andi Kleen4efc0672009-04-28 19:07:31 +0200908
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100909config VM86
910 bool "Enable VM86 support" if EMBEDDED
911 default y
912 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100913 ---help---
914 This option is required by programs like DOSEMU to run 16-bit legacy
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100915 code on X86 processors. It also may be needed by software like
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100916 XFree86 to initialize some video cards via BIOS. Disabling this
917 option saves about 6k.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100918
919config TOSHIBA
920 tristate "Toshiba Laptop support"
921 depends on X86_32
922 ---help---
923 This adds a driver to safely access the System Management Mode of
924 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
925 not work on models with a Phoenix BIOS. The System Management Mode
926 is used to set the BIOS and power saving options on Toshiba portables.
927
928 For information on utilities to make use of this driver see the
929 Toshiba Linux utilities web site at:
930 <http://www.buzzard.org.uk/toshiba/>.
931
932 Say Y if you intend to run this kernel on a Toshiba portable.
933 Say N otherwise.
934
935config I8K
936 tristate "Dell laptop support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100937 ---help---
938 This adds a driver to safely access the System Management Mode
939 of the CPU on the Dell Inspiron 8000. The System Management Mode
940 is used to read cpu temperature and cooling fan status and to
941 control the fans on the I8K portables.
942
943 This driver has been tested only on the Inspiron 8000 but it may
944 also work with other Dell laptops. You can force loading on other
945 models by passing the parameter `force=1' to the module. Use at
946 your own risk.
947
948 For information on utilities to make use of this driver see the
949 I8K Linux utilities web site at:
950 <http://people.debian.org/~dz/i8k/>
951
952 Say Y if you intend to run this kernel on a Dell Inspiron 8000.
953 Say N otherwise.
954
955config X86_REBOOTFIXUPS
Jan Beulich9ba16082008-10-15 22:01:38 -0700956 bool "Enable X86 board specific fixups for reboot"
957 depends on X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100958 ---help---
959 This enables chipset and/or board specific fixups to be done
960 in order to get reboot to work correctly. This is only needed on
961 some combinations of hardware and BIOS. The symptom, for which
962 this config is intended, is when reboot ends with a stalled/hung
963 system.
964
965 Currently, the only fixup is for the Geode machines using
Florian Fainelli5e3a77e2008-01-30 13:33:36 +0100966 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100967
968 Say Y if you want to enable the fixup. Currently, it's safe to
969 enable this option even if you don't need it.
970 Say N otherwise.
971
972config MICROCODE
Peter Oruba8d86f392008-07-28 18:44:21 +0200973 tristate "/dev/cpu/microcode - microcode support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100974 select FW_LOADER
975 ---help---
976 If you say Y here, you will be able to update the microcode on
Peter Oruba80cc9f12008-07-28 18:44:22 +0200977 certain Intel and AMD processors. The Intel support is for the
978 IA32 family, e.g. Pentium Pro, Pentium II, Pentium III,
979 Pentium 4, Xeon etc. The AMD support is for family 0x10 and
980 0x11 processors, e.g. Opteron, Phenom and Turion 64 Ultra.
981 You will obviously need the actual microcode binary data itself
982 which is not shipped with the Linux kernel.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100983
Peter Oruba8d86f392008-07-28 18:44:21 +0200984 This option selects the general module only, you need to select
985 at least one vendor specific module as well.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100986
987 To compile this driver as a module, choose M here: the
988 module will be called microcode.
989
Peter Oruba8d86f392008-07-28 18:44:21 +0200990config MICROCODE_INTEL
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100991 bool "Intel microcode patch loading support"
992 depends on MICROCODE
993 default MICROCODE
994 select FW_LOADER
995 ---help---
996 This options enables microcode patch loading support for Intel
997 processors.
Peter Oruba8d86f392008-07-28 18:44:21 +0200998
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100999 For latest news and information on obtaining all the required
1000 Intel ingredients for this driver, check:
1001 <http://www.urbanmyth.org/microcode/>.
Peter Oruba8d86f392008-07-28 18:44:21 +02001002
Peter Oruba80cc9f12008-07-28 18:44:22 +02001003config MICROCODE_AMD
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001004 bool "AMD microcode patch loading support"
1005 depends on MICROCODE
1006 select FW_LOADER
1007 ---help---
1008 If you select this option, microcode patch loading support for AMD
1009 processors will be enabled.
Peter Oruba80cc9f12008-07-28 18:44:22 +02001010
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001011config MICROCODE_OLD_INTERFACE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001012 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001013 depends on MICROCODE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001014
1015config X86_MSR
1016 tristate "/dev/cpu/*/msr - Model-specific register support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001017 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001018 This device gives privileged processes access to the x86
1019 Model-Specific Registers (MSRs). It is a character device with
1020 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
1021 MSR accesses are directed to a specific CPU on multi-processor
1022 systems.
1023
1024config X86_CPUID
1025 tristate "/dev/cpu/*/cpuid - CPU information support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001026 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001027 This device gives processes access to the x86 CPUID instruction to
1028 be executed on a specific processor. It is a character device
1029 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
1030 /dev/cpu/31/cpuid.
1031
1032choice
1033 prompt "High Memory Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001034 default HIGHMEM64G if X86_NUMAQ
Jan Beulich6fc108a2010-04-21 15:23:44 +01001035 default HIGHMEM4G
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001036 depends on X86_32
1037
1038config NOHIGHMEM
1039 bool "off"
1040 depends on !X86_NUMAQ
1041 ---help---
1042 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
1043 However, the address space of 32-bit x86 processors is only 4
1044 Gigabytes large. That means that, if you have a large amount of
1045 physical memory, not all of it can be "permanently mapped" by the
1046 kernel. The physical memory that's not permanently mapped is called
1047 "high memory".
1048
1049 If you are compiling a kernel which will never run on a machine with
1050 more than 1 Gigabyte total physical RAM, answer "off" here (default
1051 choice and suitable for most users). This will result in a "3GB/1GB"
1052 split: 3GB are mapped so that each process sees a 3GB virtual memory
1053 space and the remaining part of the 4GB virtual memory space is used
1054 by the kernel to permanently map as much physical memory as
1055 possible.
1056
1057 If the machine has between 1 and 4 Gigabytes physical RAM, then
1058 answer "4GB" here.
1059
1060 If more than 4 Gigabytes is used then answer "64GB" here. This
1061 selection turns Intel PAE (Physical Address Extension) mode on.
1062 PAE implements 3-level paging on IA32 processors. PAE is fully
1063 supported by Linux, PAE mode is implemented on all recent Intel
1064 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
1065 then the kernel will not boot on CPUs that don't support PAE!
1066
1067 The actual amount of total physical memory will either be
1068 auto detected or can be forced by using a kernel command line option
1069 such as "mem=256M". (Try "man bootparam" or see the documentation of
1070 your boot loader (lilo or loadlin) about how to pass options to the
1071 kernel at boot time.)
1072
1073 If unsure, say "off".
1074
1075config HIGHMEM4G
1076 bool "4GB"
1077 depends on !X86_NUMAQ
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001078 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001079 Select this if you have a 32-bit processor and between 1 and 4
1080 gigabytes of physical RAM.
1081
1082config HIGHMEM64G
1083 bool "64GB"
1084 depends on !M386 && !M486
1085 select X86_PAE
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001086 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001087 Select this if you have a 32-bit processor and more than 4
1088 gigabytes of physical RAM.
1089
1090endchoice
1091
1092choice
1093 depends on EXPERIMENTAL
1094 prompt "Memory split" if EMBEDDED
1095 default VMSPLIT_3G
1096 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001097 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001098 Select the desired split between kernel and user memory.
1099
1100 If the address range available to the kernel is less than the
1101 physical memory installed, the remaining memory will be available
1102 as "high memory". Accessing high memory is a little more costly
1103 than low memory, as it needs to be mapped into the kernel first.
1104 Note that increasing the kernel address space limits the range
1105 available to user programs, making the address space there
1106 tighter. Selecting anything other than the default 3G/1G split
1107 will also likely make your kernel incompatible with binary-only
1108 kernel modules.
1109
1110 If you are not absolutely sure what you are doing, leave this
1111 option alone!
1112
1113 config VMSPLIT_3G
1114 bool "3G/1G user/kernel split"
1115 config VMSPLIT_3G_OPT
1116 depends on !X86_PAE
1117 bool "3G/1G user/kernel split (for full 1G low memory)"
1118 config VMSPLIT_2G
1119 bool "2G/2G user/kernel split"
1120 config VMSPLIT_2G_OPT
1121 depends on !X86_PAE
1122 bool "2G/2G user/kernel split (for full 2G low memory)"
1123 config VMSPLIT_1G
1124 bool "1G/3G user/kernel split"
1125endchoice
1126
1127config PAGE_OFFSET
1128 hex
1129 default 0xB0000000 if VMSPLIT_3G_OPT
1130 default 0x80000000 if VMSPLIT_2G
1131 default 0x78000000 if VMSPLIT_2G_OPT
1132 default 0x40000000 if VMSPLIT_1G
1133 default 0xC0000000
1134 depends on X86_32
1135
1136config HIGHMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001137 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001138 depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001139
1140config X86_PAE
Jan Beulich9ba16082008-10-15 22:01:38 -07001141 bool "PAE (Physical Address Extension) Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001142 depends on X86_32 && !HIGHMEM4G
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001143 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001144 PAE is required for NX support, and furthermore enables
1145 larger swapspace support for non-overcommit purposes. It
1146 has the cost of more pagetable lookup overhead, and also
1147 consumes more pagetable space per process.
1148
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001149config ARCH_PHYS_ADDR_T_64BIT
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001150 def_bool X86_64 || X86_PAE
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001151
Nick Piggin9e899812008-10-22 12:33:16 +02001152config DIRECT_GBPAGES
1153 bool "Enable 1GB pages for kernel pagetables" if EMBEDDED
1154 default y
1155 depends on X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001156 ---help---
Nick Piggin9e899812008-10-22 12:33:16 +02001157 Allow the kernel linear mapping to use 1GB pages on CPUs that
1158 support it. This can improve the kernel's performance a tiny bit by
1159 reducing TLB pressure. If in doubt, say "Y".
1160
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001161# Common NUMA Features
1162config NUMA
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001163 bool "Numa Memory Allocation and Scheduler Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001164 depends on SMP
Rafael J. Wysocki604d2052008-11-12 23:26:14 +01001165 depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL)
Yinghai Lu0699eae2008-06-17 15:39:01 -07001166 default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001167 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001168 Enable NUMA (Non Uniform Memory Access) support.
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001169
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001170 The kernel will try to allocate memory used by a CPU on the
1171 local memory controller of the CPU and add some more
1172 NUMA awareness to the kernel.
1173
Ingo Molnarc280ea52008-11-08 13:29:45 +01001174 For 64-bit this is recommended if the system is Intel Core i7
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001175 (or later), AMD Opteron, or EM64T NUMA.
1176
1177 For 32-bit this is only needed on (rare) 32-bit-only platforms
1178 that support NUMA topologies, such as NUMAQ / Summit, or if you
1179 boot a 32-bit kernel on a 64-bit NUMA platform.
1180
1181 Otherwise, you should say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001182
1183comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
1184 depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
1185
1186config K8_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001187 def_bool y
1188 prompt "Old style AMD Opteron NUMA detection"
1189 depends on X86_64 && NUMA && PCI
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001190 ---help---
1191 Enable K8 NUMA node topology detection. You should say Y here if
1192 you have a multi processor AMD K8 system. This uses an old
1193 method to read the NUMA configuration directly from the builtin
1194 Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
1195 instead, which also takes priority if both are compiled in.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001196
1197config X86_64_ACPI_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001198 def_bool y
1199 prompt "ACPI NUMA detection"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001200 depends on X86_64 && NUMA && ACPI && PCI
1201 select ACPI_NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001202 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001203 Enable ACPI SRAT based node topology detection.
1204
Suresh Siddha6ec6e0d2008-03-25 10:14:35 -07001205# Some NUMA nodes have memory ranges that span
1206# other nodes. Even though a pfn is valid and
1207# between a node's start and end pfns, it may not
1208# reside on that node. See memmap_init_zone()
1209# for details.
1210config NODES_SPAN_OTHER_NODES
1211 def_bool y
1212 depends on X86_64_ACPI_NUMA
1213
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001214config NUMA_EMU
1215 bool "NUMA emulation"
1216 depends on X86_64 && NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001217 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001218 Enable NUMA emulation. A flat machine will be split
1219 into virtual nodes when booted with "numa=fake=N", where N is the
1220 number of nodes. This is only useful for debugging.
1221
1222config NODES_SHIFT
Linus Torvaldsd25e26b2008-08-25 14:15:38 -07001223 int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
David Rientjes51591e32010-03-25 15:39:27 -07001224 range 1 10
1225 default "10" if MAXSMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001226 default "6" if X86_64
1227 default "4" if X86_NUMAQ
1228 default "3"
1229 depends on NEED_MULTIPLE_NODES
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001230 ---help---
Mike Travis1184dc22008-05-12 21:21:12 +02001231 Specify the maximum number of NUMA Nodes available on the target
Matt LaPlante692105b2009-01-26 11:12:25 +01001232 system. Increases memory reserved to accommodate various tables.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001233
Tejun Heoc1329372009-02-24 11:57:20 +09001234config HAVE_ARCH_BOOTMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001235 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001236 depends on X86_32 && NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001237
1238config ARCH_HAVE_MEMORY_PRESENT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001239 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001240 depends on X86_32 && DISCONTIGMEM
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001241
1242config NEED_NODE_MEMMAP_SIZE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001243 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001244 depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001245
1246config HAVE_ARCH_ALLOC_REMAP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001247 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001248 depends on X86_32 && NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001249
1250config ARCH_FLATMEM_ENABLE
1251 def_bool y
Jeff Chua99809962008-08-06 19:09:53 +08001252 depends on X86_32 && ARCH_SELECT_MEMORY_MODEL && !NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001253
1254config ARCH_DISCONTIGMEM_ENABLE
1255 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001256 depends on NUMA && X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001257
1258config ARCH_DISCONTIGMEM_DEFAULT
1259 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001260 depends on NUMA && X86_32
1261
KAMEZAWA Hiroyuki94925872009-09-22 16:45:45 -07001262config ARCH_PROC_KCORE_TEXT
1263 def_bool y
1264 depends on X86_64 && PROC_KCORE
1265
Christoph Lameterb2632952008-01-30 13:30:47 +01001266config ARCH_SPARSEMEM_DEFAULT
1267 def_bool y
1268 depends on X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001269
1270config ARCH_SPARSEMEM_ENABLE
1271 def_bool y
Yinghai Lu4272ebf2009-01-29 15:14:46 -08001272 depends on X86_64 || NUMA || (EXPERIMENTAL && X86_32) || X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001273 select SPARSEMEM_STATIC if X86_32
1274 select SPARSEMEM_VMEMMAP_ENABLE if X86_64
1275
1276config ARCH_SELECT_MEMORY_MODEL
1277 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001278 depends on ARCH_SPARSEMEM_ENABLE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001279
1280config ARCH_MEMORY_PROBE
1281 def_bool X86_64
1282 depends on MEMORY_HOTPLUG
1283
Avi Kivitya29815a2010-01-10 16:28:09 +02001284config ILLEGAL_POINTER_VALUE
1285 hex
1286 default 0 if X86_32
1287 default 0xdead000000000000 if X86_64
1288
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001289source "mm/Kconfig"
1290
1291config HIGHPTE
1292 bool "Allocate 3rd-level pagetables from highmem"
Jan Beulich6fc108a2010-04-21 15:23:44 +01001293 depends on HIGHMEM
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001294 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001295 The VM uses one page table entry for each page of physical memory.
1296 For systems with a lot of RAM, this can be wasteful of precious
1297 low memory. Setting this option will put user-space page table
1298 entries in high memory.
1299
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001300config X86_CHECK_BIOS_CORRUPTION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001301 bool "Check for low memory corruption"
1302 ---help---
1303 Periodically check for memory corruption in low memory, which
1304 is suspected to be caused by BIOS. Even when enabled in the
1305 configuration, it is disabled at runtime. Enable it by
1306 setting "memory_corruption_check=1" on the kernel command
1307 line. By default it scans the low 64k of memory every 60
1308 seconds; see the memory_corruption_check_size and
1309 memory_corruption_check_period parameters in
1310 Documentation/kernel-parameters.txt to adjust this.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001311
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001312 When enabled with the default parameters, this option has
1313 almost no overhead, as it reserves a relatively small amount
1314 of memory and scans it infrequently. It both detects corruption
1315 and prevents it from affecting the running system.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001316
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001317 It is, however, intended as a diagnostic tool; if repeatable
1318 BIOS-originated corruption always affects the same memory,
1319 you can use memmap= to prevent the kernel from using that
1320 memory.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001321
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001322config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001323 bool "Set the default setting of memory_corruption_check"
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001324 depends on X86_CHECK_BIOS_CORRUPTION
1325 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001326 ---help---
1327 Set whether the default state of memory_corruption_check is
1328 on or off.
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001329
Ingo Molnarfc381512008-09-16 10:07:34 +02001330config X86_RESERVE_LOW_64K
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001331 bool "Reserve low 64K of RAM on AMI/Phoenix BIOSen"
Ingo Molnarfc381512008-09-16 10:07:34 +02001332 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001333 ---help---
1334 Reserve the first 64K of physical RAM on BIOSes that are known
1335 to potentially corrupt that memory range. A numbers of BIOSes are
1336 known to utilize this area during suspend/resume, so it must not
1337 be used by the kernel.
Ingo Molnarfc381512008-09-16 10:07:34 +02001338
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001339 Set this to N if you are absolutely sure that you trust the BIOS
1340 to get all its memory reservations and usages right.
Ingo Molnarfc381512008-09-16 10:07:34 +02001341
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001342 If you have doubts about the BIOS (e.g. suspend/resume does not
1343 work or there's kernel crashes after certain hardware hotplug
1344 events) and it's not AMI or Phoenix, then you might want to enable
1345 X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check typical
1346 corruption patterns.
Ingo Molnarfc381512008-09-16 10:07:34 +02001347
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001348 Say Y if unsure.
Ingo Molnarfc381512008-09-16 10:07:34 +02001349
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001350config MATH_EMULATION
1351 bool
1352 prompt "Math emulation" if X86_32
1353 ---help---
1354 Linux can emulate a math coprocessor (used for floating point
1355 operations) if you don't have one. 486DX and Pentium processors have
1356 a math coprocessor built in, 486SX and 386 do not, unless you added
1357 a 487DX or 387, respectively. (The messages during boot time can
1358 give you some hints here ["man dmesg"].) Everyone needs either a
1359 coprocessor or this emulation.
1360
1361 If you don't have a math coprocessor, you need to say Y here; if you
1362 say Y here even though you have a coprocessor, the coprocessor will
1363 be used nevertheless. (This behavior can be changed with the kernel
1364 command line option "no387", which comes handy if your coprocessor
1365 is broken. Try "man bootparam" or see the documentation of your boot
1366 loader (lilo or loadlin) about how to pass options to the kernel at
1367 boot time.) This means that it is a good idea to say Y here if you
1368 intend to use this kernel on different machines.
1369
1370 More information about the internals of the Linux math coprocessor
1371 emulation can be found in <file:arch/x86/math-emu/README>.
1372
1373 If you are not sure, say Y; apart from resulting in a 66 KB bigger
1374 kernel, it won't hurt.
1375
1376config MTRR
Jan Beulich6fc108a2010-04-21 15:23:44 +01001377 def_bool y
Arjan van de Venc03cb312009-10-11 10:33:02 -07001378 prompt "MTRR (Memory Type Range Register) support" if EMBEDDED
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001379 ---help---
1380 On Intel P6 family processors (Pentium Pro, Pentium II and later)
1381 the Memory Type Range Registers (MTRRs) may be used to control
1382 processor access to memory ranges. This is most useful if you have
1383 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
1384 allows bus write transfers to be combined into a larger transfer
1385 before bursting over the PCI/AGP bus. This can increase performance
1386 of image write operations 2.5 times or more. Saying Y here creates a
1387 /proc/mtrr file which may be used to manipulate your processor's
1388 MTRRs. Typically the X server should use this.
1389
1390 This code has a reasonably generic interface so that similar
1391 control registers on other processors can be easily supported
1392 as well:
1393
1394 The Cyrix 6x86, 6x86MX and M II processors have Address Range
1395 Registers (ARRs) which provide a similar functionality to MTRRs. For
1396 these, the ARRs are used to emulate the MTRRs.
1397 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
1398 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
1399 write-combining. All of these processors are supported by this code
1400 and it makes sense to say Y here if you have one of them.
1401
1402 Saying Y here also fixes a problem with buggy SMP BIOSes which only
1403 set the MTRRs for the boot CPU and not for the secondary CPUs. This
1404 can lead to all sorts of problems, so it's good to say Y here.
1405
1406 You can safely say Y even if your machine doesn't have MTRRs, you'll
1407 just add about 9 KB to your kernel.
1408
Randy Dunlap7225e752008-07-26 17:54:22 -07001409 See <file:Documentation/x86/mtrr.txt> for more information.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001410
Yinghai Lu95ffa242008-04-29 03:52:33 -07001411config MTRR_SANITIZER
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001412 def_bool y
Yinghai Lu95ffa242008-04-29 03:52:33 -07001413 prompt "MTRR cleanup support"
1414 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001415 ---help---
Thomas Gleixneraba37282008-07-15 14:48:48 +02001416 Convert MTRR layout from continuous to discrete, so X drivers can
1417 add writeback entries.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001418
Thomas Gleixneraba37282008-07-15 14:48:48 +02001419 Can be disabled with disable_mtrr_cleanup on the kernel command line.
Matt LaPlante692105b2009-01-26 11:12:25 +01001420 The largest mtrr entry size for a continuous block can be set with
Thomas Gleixneraba37282008-07-15 14:48:48 +02001421 mtrr_chunk_size.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001422
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001423 If unsure, say Y.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001424
1425config MTRR_SANITIZER_ENABLE_DEFAULT
Yinghai Luf5098d62008-04-29 20:25:58 -07001426 int "MTRR cleanup enable value (0-1)"
1427 range 0 1
1428 default "0"
Yinghai Lu95ffa242008-04-29 03:52:33 -07001429 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001430 ---help---
Yinghai Luf5098d62008-04-29 20:25:58 -07001431 Enable mtrr cleanup default value
Yinghai Lu95ffa242008-04-29 03:52:33 -07001432
Yinghai Lu12031a62008-05-02 02:40:22 -07001433config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
1434 int "MTRR cleanup spare reg num (0-7)"
1435 range 0 7
1436 default "1"
1437 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001438 ---help---
Yinghai Lu12031a62008-05-02 02:40:22 -07001439 mtrr cleanup spare entries default, it can be changed via
Thomas Gleixneraba37282008-07-15 14:48:48 +02001440 mtrr_spare_reg_nr=N on the kernel command line.
Yinghai Lu12031a62008-05-02 02:40:22 -07001441
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001442config X86_PAT
Jan Beulich6fc108a2010-04-21 15:23:44 +01001443 def_bool y
Arjan van de Venc03cb312009-10-11 10:33:02 -07001444 prompt "x86 PAT support" if EMBEDDED
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001445 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001446 ---help---
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001447 Use PAT attributes to setup page level cache control.
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001448
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001449 PATs are the modern equivalents of MTRRs and are much more
1450 flexible than MTRRs.
1451
1452 Say N here if you see bootup problems (boot crash, boot hang,
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001453 spontaneous reboots) or a non-working video driver.
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001454
1455 If unsure, say Y.
1456
Venkatesh Pallipadi46cf98c2009-07-10 09:57:37 -07001457config ARCH_USES_PG_UNCACHED
1458 def_bool y
1459 depends on X86_PAT
1460
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001461config EFI
Jan Beulich9ba16082008-10-15 22:01:38 -07001462 bool "EFI runtime service support"
Huang, Ying5b836832008-01-30 13:31:19 +01001463 depends on ACPI
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001464 ---help---
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001465 This enables the kernel to use EFI runtime services that are
1466 available (such as the EFI variable services).
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001467
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001468 This option is only useful on systems that have EFI firmware.
1469 In addition, you should use the latest ELILO loader available
1470 at <http://elilo.sourceforge.net> in order to take advantage
1471 of EFI runtime services. However, even with this option, the
1472 resultant kernel should continue to boot on existing non-EFI
1473 platforms.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001474
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001475config SECCOMP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001476 def_bool y
1477 prompt "Enable seccomp to safely compute untrusted bytecode"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001478 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001479 This kernel feature is useful for number crunching applications
1480 that may need to compute untrusted bytecode during their
1481 execution. By using pipes or other transports made available to
1482 the process as file descriptors supporting the read/write
1483 syscalls, it's possible to isolate those applications in
1484 their own address space using seccomp. Once seccomp is
Alexey Dobriyan9c0bbee2008-09-09 11:01:31 +04001485 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001486 and the task is only allowed to execute a few safe syscalls
1487 defined by each seccomp mode.
1488
1489 If unsure, say Y. Only embedded should say N here.
1490
1491config CC_STACKPROTECTOR
1492 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001493 ---help---
1494 This option turns on the -fstack-protector GCC feature. This
Ingo Molnar113c5412008-02-14 10:36:03 +01001495 feature puts, at the beginning of functions, a canary value on
1496 the stack just before the return address, and validates
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001497 the value just before actually returning. Stack based buffer
1498 overflows (that need to overwrite this return address) now also
1499 overwrite the canary, which gets detected and the attack is then
1500 neutralized via a kernel panic.
1501
1502 This feature requires gcc version 4.2 or above, or a distribution
1503 gcc with the feature backported. Older versions are automatically
Ingo Molnar113c5412008-02-14 10:36:03 +01001504 detected and for those versions, this configuration option is
1505 ignored. (and a warning is printed during bootup)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001506
1507source kernel/Kconfig.hz
1508
1509config KEXEC
1510 bool "kexec system call"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001511 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001512 kexec is a system call that implements the ability to shutdown your
1513 current kernel, and to start another kernel. It is like a reboot
1514 but it is independent of the system firmware. And like a reboot
1515 you can start any kernel with it, not just Linux.
1516
1517 The name comes from the similarity to the exec system call.
1518
1519 It is an ongoing process to be certain the hardware in a machine
1520 is properly shutdown, so do not be surprised if this code does not
1521 initially work for you. It may help to enable device hotplugging
1522 support. As of this writing the exact hardware interface is
1523 strongly in flux, so no good recommendation can be made.
1524
1525config CRASH_DUMP
Pavel Machek04b69442008-08-14 17:16:50 +02001526 bool "kernel crash dumps"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001527 depends on X86_64 || (X86_32 && HIGHMEM)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001528 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001529 Generate crash dump after being started by kexec.
1530 This should be normally only set in special crash dump kernels
1531 which are loaded in the main kernel with kexec-tools into
1532 a specially reserved region and then later executed after
1533 a crash by kdump/kexec. The crash dump kernel must be compiled
1534 to a memory address not used by the main kernel or BIOS using
1535 PHYSICAL_START, or it must be built as a relocatable image
1536 (CONFIG_RELOCATABLE=y).
1537 For more details see Documentation/kdump/kdump.txt
1538
Huang Ying3ab83522008-07-25 19:45:07 -07001539config KEXEC_JUMP
1540 bool "kexec jump (EXPERIMENTAL)"
1541 depends on EXPERIMENTAL
Huang Yingfee7b0d2009-03-10 10:57:16 +08001542 depends on KEXEC && HIBERNATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001543 ---help---
Huang Ying89081d12008-07-25 19:45:10 -07001544 Jump between original kernel and kexeced kernel and invoke
1545 code in physical address mode via KEXEC
Huang Ying3ab83522008-07-25 19:45:07 -07001546
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001547config PHYSICAL_START
1548 hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001549 default "0x1000000"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001550 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001551 This gives the physical address where the kernel is loaded.
1552
1553 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
1554 bzImage will decompress itself to above physical address and
1555 run from there. Otherwise, bzImage will run from the address where
1556 it has been loaded by the boot loader and will ignore above physical
1557 address.
1558
1559 In normal kdump cases one does not have to set/change this option
1560 as now bzImage can be compiled as a completely relocatable image
1561 (CONFIG_RELOCATABLE=y) and be used to load and run from a different
1562 address. This option is mainly useful for the folks who don't want
1563 to use a bzImage for capturing the crash dump and want to use a
1564 vmlinux instead. vmlinux is not relocatable hence a kernel needs
1565 to be specifically compiled to run from a specific memory area
1566 (normally a reserved region) and this option comes handy.
1567
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001568 So if you are using bzImage for capturing the crash dump,
1569 leave the value here unchanged to 0x1000000 and set
1570 CONFIG_RELOCATABLE=y. Otherwise if you plan to use vmlinux
1571 for capturing the crash dump change this value to start of
1572 the reserved region. In other words, it can be set based on
1573 the "X" value as specified in the "crashkernel=YM@XM"
1574 command line boot parameter passed to the panic-ed
1575 kernel. Please take a look at Documentation/kdump/kdump.txt
1576 for more details about crash dumps.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001577
1578 Usage of bzImage for capturing the crash dump is recommended as
1579 one does not have to build two kernels. Same kernel can be used
1580 as production kernel and capture kernel. Above option should have
1581 gone away after relocatable bzImage support is introduced. But it
1582 is present because there are users out there who continue to use
1583 vmlinux for dump capture. This option should go away down the
1584 line.
1585
1586 Don't change this unless you know what you are doing.
1587
1588config RELOCATABLE
H. Peter Anvin26717802009-05-07 14:19:34 -07001589 bool "Build a relocatable kernel"
1590 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001591 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001592 This builds a kernel image that retains relocation information
1593 so it can be loaded someplace besides the default 1MB.
1594 The relocations tend to make the kernel binary about 10% larger,
1595 but are discarded at runtime.
1596
1597 One use is for the kexec on panic case where the recovery kernel
1598 must live at a different physical address than the primary
1599 kernel.
1600
1601 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
1602 it has been loaded at and the compile time physical address
1603 (CONFIG_PHYSICAL_START) is ignored.
1604
H. Peter Anvin845adf72009-05-05 21:20:51 -07001605# Relocation on x86-32 needs some additional build support
1606config X86_NEED_RELOCS
1607 def_bool y
1608 depends on X86_32 && RELOCATABLE
1609
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001610config PHYSICAL_ALIGN
Jan Beulich6fc108a2010-04-21 15:23:44 +01001611 hex "Alignment value to which kernel should be aligned" if X86_32
H. Peter Anvinceefccc2009-05-11 16:12:16 -07001612 default "0x1000000"
1613 range 0x2000 0x1000000
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001614 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001615 This value puts the alignment restrictions on physical address
1616 where kernel is loaded and run from. Kernel is compiled for an
1617 address which meets above alignment restriction.
1618
1619 If bootloader loads the kernel at a non-aligned address and
1620 CONFIG_RELOCATABLE is set, kernel will move itself to nearest
1621 address aligned to above value and run from there.
1622
1623 If bootloader loads the kernel at a non-aligned address and
1624 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
1625 load address and decompress itself to the address it has been
1626 compiled for and run from there. The address for which kernel is
1627 compiled already meets above alignment restrictions. Hence the
1628 end result is that kernel runs from a physical address meeting
1629 above alignment restrictions.
1630
1631 Don't change this unless you know what you are doing.
1632
1633config HOTPLUG_CPU
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001634 bool "Support for hot-pluggable CPUs"
Ingo Molnar4b19ed912009-01-27 17:47:24 +01001635 depends on SMP && HOTPLUG
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001636 ---help---
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001637 Say Y here to allow turning CPUs off and on. CPUs can be
1638 controlled through /sys/devices/system/cpu.
1639 ( Note: power management support will enable this option
1640 automatically on SMP systems. )
1641 Say N if you want to disable CPU hotplug.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001642
1643config COMPAT_VDSO
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001644 def_bool y
1645 prompt "Compat VDSO support"
Roland McGrathaf65d642008-01-30 13:30:43 +01001646 depends on X86_32 || IA32_EMULATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001647 ---help---
Roland McGrathaf65d642008-01-30 13:30:43 +01001648 Map the 32-bit VDSO to the predictable old-style address too.
Randy Dunlape84446d2009-11-10 15:46:52 -08001649
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001650 Say N here if you are running a sufficiently recent glibc
1651 version (2.3.3 or later), to remove the high-mapped
1652 VDSO mapping and to exclusively use the randomized VDSO.
1653
1654 If unsure, say Y.
1655
Tim Bird516cbf32008-08-12 12:52:36 -07001656config CMDLINE_BOOL
1657 bool "Built-in kernel command line"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001658 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001659 Allow for specifying boot arguments to the kernel at
1660 build time. On some systems (e.g. embedded ones), it is
1661 necessary or convenient to provide some or all of the
1662 kernel boot arguments with the kernel itself (that is,
1663 to not rely on the boot loader to provide them.)
1664
1665 To compile command line arguments into the kernel,
1666 set this option to 'Y', then fill in the
1667 the boot arguments in CONFIG_CMDLINE.
1668
1669 Systems with fully functional boot loaders (i.e. non-embedded)
1670 should leave this option set to 'N'.
1671
1672config CMDLINE
1673 string "Built-in kernel command string"
1674 depends on CMDLINE_BOOL
1675 default ""
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001676 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001677 Enter arguments here that should be compiled into the kernel
1678 image and used at boot time. If the boot loader provides a
1679 command line at boot time, it is appended to this string to
1680 form the full kernel command line, when the system boots.
1681
1682 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
1683 change this behavior.
1684
1685 In most cases, the command line (whether built-in or provided
1686 by the boot loader) should specify the device for the root
1687 file system.
1688
1689config CMDLINE_OVERRIDE
1690 bool "Built-in command line overrides boot loader arguments"
Tim Bird516cbf32008-08-12 12:52:36 -07001691 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
Lee Schermerhorne534c7c2010-05-26 14:44:58 -07001713config USE_PERCPU_NUMA_NODE_ID
1714 def_bool X86_64
1715 depends on NUMA
1716
Bjorn Helgaasda85f862008-11-05 13:37:27 -06001717menu "Power management and ACPI options"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001718
1719config ARCH_HIBERNATION_HEADER
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001720 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001721 depends on X86_64 && HIBERNATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001722
1723source "kernel/power/Kconfig"
1724
1725source "drivers/acpi/Kconfig"
1726
Feng Tangefafc8b2009-08-14 15:23:29 -04001727source "drivers/sfi/Kconfig"
1728
Andi Kleena6b68072008-01-30 13:32:49 +01001729config X86_APM_BOOT
Jan Beulich6fc108a2010-04-21 15:23:44 +01001730 def_bool y
Andi Kleena6b68072008-01-30 13:32:49 +01001731 depends on APM || APM_MODULE
1732
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001733menuconfig APM
1734 tristate "APM (Advanced Power Management) BIOS support"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001735 depends on X86_32 && PM_SLEEP
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001736 ---help---
1737 APM is a BIOS specification for saving power using several different
1738 techniques. This is mostly useful for battery powered laptops with
1739 APM compliant BIOSes. If you say Y here, the system time will be
1740 reset after a RESUME operation, the /proc/apm device will provide
1741 battery status information, and user-space programs will receive
1742 notification of APM "events" (e.g. battery status change).
1743
1744 If you select "Y" here, you can disable actual use of the APM
1745 BIOS by passing the "apm=off" option to the kernel at boot time.
1746
1747 Note that the APM support is almost completely disabled for
1748 machines with more than one CPU.
1749
1750 In order to use APM, you will need supporting software. For location
Randy Dunlap53471122008-03-12 18:10:51 -04001751 and more information, read <file:Documentation/power/pm.txt> and the
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001752 Battery Powered Linux mini-HOWTO, available from
1753 <http://www.tldp.org/docs.html#howto>.
1754
1755 This driver does not spin down disk drives (see the hdparm(8)
1756 manpage ("man 8 hdparm") for that), and it doesn't turn off
1757 VESA-compliant "green" monitors.
1758
1759 This driver does not support the TI 4000M TravelMate and the ACER
1760 486/DX4/75 because they don't have compliant BIOSes. Many "green"
1761 desktop machines also don't have compliant BIOSes, and this driver
1762 may cause those machines to panic during the boot phase.
1763
1764 Generally, if you don't have a battery in your machine, there isn't
1765 much point in using this driver and you should say N. If you get
1766 random kernel OOPSes or reboots that don't seem to be related to
1767 anything, try disabling/enabling this option (or disabling/enabling
1768 APM in your BIOS).
1769
1770 Some other things you should try when experiencing seemingly random,
1771 "weird" problems:
1772
1773 1) make sure that you have enough swap space and that it is
1774 enabled.
1775 2) pass the "no-hlt" option to the kernel
1776 3) switch on floating point emulation in the kernel and pass
1777 the "no387" option to the kernel
1778 4) pass the "floppy=nodma" option to the kernel
1779 5) pass the "mem=4M" option to the kernel (thereby disabling
1780 all but the first 4 MB of RAM)
1781 6) make sure that the CPU is not over clocked.
1782 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
1783 8) disable the cache from your BIOS settings
1784 9) install a fan for the video card or exchange video RAM
1785 10) install a better fan for the CPU
1786 11) exchange RAM chips
1787 12) exchange the motherboard.
1788
1789 To compile this driver as a module, choose M here: the
1790 module will be called apm.
1791
1792if APM
1793
1794config APM_IGNORE_USER_SUSPEND
1795 bool "Ignore USER SUSPEND"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001796 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001797 This option will ignore USER SUSPEND requests. On machines with a
1798 compliant APM BIOS, you want to say N. However, on the NEC Versa M
1799 series notebooks, it is necessary to say Y because of a BIOS bug.
1800
1801config APM_DO_ENABLE
1802 bool "Enable PM at boot time"
1803 ---help---
1804 Enable APM features at boot time. From page 36 of the APM BIOS
1805 specification: "When disabled, the APM BIOS does not automatically
1806 power manage devices, enter the Standby State, enter the Suspend
1807 State, or take power saving steps in response to CPU Idle calls."
1808 This driver will make CPU Idle calls when Linux is idle (unless this
1809 feature is turned off -- see "Do CPU IDLE calls", below). This
1810 should always save battery power, but more complicated APM features
1811 will be dependent on your BIOS implementation. You may need to turn
1812 this option off if your computer hangs at boot time when using APM
1813 support, or if it beeps continuously instead of suspending. Turn
1814 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
1815 T400CDT. This is off by default since most machines do fine without
1816 this feature.
1817
1818config APM_CPU_IDLE
1819 bool "Make CPU Idle calls when idle"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001820 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001821 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
1822 On some machines, this can activate improved power savings, such as
1823 a slowed CPU clock rate, when the machine is idle. These idle calls
1824 are made after the idle loop has run for some length of time (e.g.,
1825 333 mS). On some machines, this will cause a hang at boot time or
1826 whenever the CPU becomes idle. (On machines with more than one CPU,
1827 this option does nothing.)
1828
1829config APM_DISPLAY_BLANK
1830 bool "Enable console blanking using APM"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001831 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001832 Enable console blanking using the APM. Some laptops can use this to
1833 turn off the LCD backlight when the screen blanker of the Linux
1834 virtual console blanks the screen. Note that this is only used by
1835 the virtual console screen blanker, and won't turn off the backlight
1836 when using the X Window system. This also doesn't have anything to
1837 do with your VESA-compliant power-saving monitor. Further, this
1838 option doesn't work for all laptops -- it might not turn off your
1839 backlight at all, or it might print a lot of errors to the console,
1840 especially if you are using gpm.
1841
1842config APM_ALLOW_INTS
1843 bool "Allow interrupts during APM BIOS calls"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001844 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001845 Normally we disable external interrupts while we are making calls to
1846 the APM BIOS as a measure to lessen the effects of a badly behaving
1847 BIOS implementation. The BIOS should reenable interrupts if it
1848 needs to. Unfortunately, some BIOSes do not -- especially those in
1849 many of the newer IBM Thinkpads. If you experience hangs when you
1850 suspend, try setting this to Y. Otherwise, say N.
1851
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001852endif # APM
1853
1854source "arch/x86/kernel/cpu/cpufreq/Kconfig"
1855
1856source "drivers/cpuidle/Kconfig"
1857
Andy Henroid27471fd2008-10-09 11:45:22 -07001858source "drivers/idle/Kconfig"
1859
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001860endmenu
1861
1862
1863menu "Bus options (PCI etc.)"
1864
1865config PCI
Ingo Molnar1ac97012008-05-19 14:10:14 +02001866 bool "PCI support"
Adrian Bunk1c858082008-01-30 13:32:32 +01001867 default y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001868 select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001869 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001870 Find out whether you have a PCI motherboard. PCI is the name of a
1871 bus system, i.e. the way the CPU talks to the other stuff inside
1872 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1873 VESA. If you have PCI, say Y, otherwise N.
1874
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001875choice
1876 prompt "PCI access mode"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001877 depends on X86_32 && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001878 default PCI_GOANY
1879 ---help---
1880 On PCI systems, the BIOS can be used to detect the PCI devices and
1881 determine their configuration. However, some old PCI motherboards
1882 have BIOS bugs and may crash if this is done. Also, some embedded
1883 PCI-based systems don't have any BIOS at all. Linux can also try to
1884 detect the PCI hardware directly without using the BIOS.
1885
1886 With this option, you can specify how Linux should detect the
1887 PCI devices. If you choose "BIOS", the BIOS will be used,
1888 if you choose "Direct", the BIOS won't be used, and if you
1889 choose "MMConfig", then PCI Express MMCONFIG will be used.
1890 If you choose "Any", the kernel will try MMCONFIG, then the
1891 direct access method and falls back to the BIOS if that doesn't
1892 work. If unsure, go with the default, which is "Any".
1893
1894config PCI_GOBIOS
1895 bool "BIOS"
1896
1897config PCI_GOMMCONFIG
1898 bool "MMConfig"
1899
1900config PCI_GODIRECT
1901 bool "Direct"
1902
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001903config PCI_GOOLPC
1904 bool "OLPC"
1905 depends on OLPC
1906
Andres Salomon2bdd1b02008-06-05 14:14:41 -07001907config PCI_GOANY
1908 bool "Any"
1909
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001910endchoice
1911
1912config PCI_BIOS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001913 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001914 depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001915
1916# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
1917config PCI_DIRECT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001918 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001919 depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001920
1921config PCI_MMCONFIG
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001922 def_bool y
Feng Tang5f0db7a2009-08-14 15:37:50 -04001923 depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001924
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001925config PCI_OLPC
Andres Salomon2bdd1b02008-06-05 14:14:41 -07001926 def_bool y
1927 depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001928
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001929config PCI_DOMAINS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001930 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001931 depends on PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001932
1933config PCI_MMCONFIG
1934 bool "Support mmconfig PCI config space access"
1935 depends on X86_64 && PCI && ACPI
1936
Ira W. Snyder3f6ea842010-04-01 11:43:30 -07001937config PCI_CNB20LE_QUIRK
1938 bool "Read CNB20LE Host Bridge Windows"
1939 depends on PCI
1940 help
1941 Read the PCI windows out of the CNB20LE host bridge. This allows
1942 PCI hotplug to work on systems with the CNB20LE chipset which do
1943 not have ACPI.
1944
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001945config DMAR
1946 bool "Support for DMA Remapping Devices (EXPERIMENTAL)"
David Woodhouse4cf2e752009-02-11 17:23:43 +00001947 depends on PCI_MSI && ACPI && EXPERIMENTAL
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001948 help
1949 DMA remapping (DMAR) devices support enables independent address
1950 translations for Direct Memory Access (DMA) from devices.
1951 These DMA remapping devices are reported via ACPI tables
1952 and include PCI device scope covered by these DMA
1953 remapping devices.
1954
Kyle McMartin0cd5c3c2009-02-04 14:29:19 -08001955config DMAR_DEFAULT_ON
Kyle McMartinf6be37f2009-02-26 12:57:56 -05001956 def_bool y
Kyle McMartin0cd5c3c2009-02-04 14:29:19 -08001957 prompt "Enable DMA Remapping Devices by default"
1958 depends on DMAR
1959 help
1960 Selecting this option will enable a DMAR device at boot time if
1961 one is found. If this option is not selected, DMAR support can
1962 be enabled by passing intel_iommu=on to the kernel. It is
1963 recommended you say N here while the DMAR code remains
1964 experimental.
1965
David Woodhouse62edf5d2009-07-04 10:59:46 +01001966config DMAR_BROKEN_GFX_WA
Jan Beulich6fc108a2010-04-21 15:23:44 +01001967 bool "Workaround broken graphics drivers (going away soon)"
David Woodhouse0c02a202009-09-19 09:37:23 -07001968 depends on DMAR && BROKEN
David Woodhouse62edf5d2009-07-04 10:59:46 +01001969 ---help---
1970 Current Graphics drivers tend to use physical address
1971 for DMA and avoid using DMA APIs. Setting this config
1972 option permits the IOMMU driver to set a unity map for
1973 all the OS-visible memory. Hence the driver can continue
1974 to use physical addresses for DMA, at least until this
1975 option is removed in the 2.6.32 kernel.
1976
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001977config DMAR_FLOPPY_WA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001978 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001979 depends on DMAR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001980 ---help---
David Woodhousec7ab48d2009-06-26 19:10:36 +01001981 Floppy disk drivers are known to bypass DMA API calls
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001982 thereby failing to work when IOMMU is enabled. This
1983 workaround will setup a 1:1 mapping for the first
David Woodhousec7ab48d2009-06-26 19:10:36 +01001984 16MiB to make floppy (an ISA device) work.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001985
Suresh Siddha9fa8c482008-07-10 11:17:00 -07001986config INTR_REMAP
1987 bool "Support for Interrupt Remapping (EXPERIMENTAL)"
1988 depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI && EXPERIMENTAL
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001989 ---help---
1990 Supports Interrupt remapping for IO-APIC and MSI devices.
1991 To use x2apic mode in the CPU's which support x2APIC enhancements or
1992 to support platforms with CPU's having > 8 bit APIC ID, say Y.
Suresh Siddha9fa8c482008-07-10 11:17:00 -07001993
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001994source "drivers/pci/pcie/Kconfig"
1995
1996source "drivers/pci/Kconfig"
1997
1998# x86_64 have no ISA slots, but do have ISA-style DMA.
1999config ISA_DMA_API
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002000 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002001
2002if X86_32
2003
2004config ISA
2005 bool "ISA support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002006 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002007 Find out whether you have ISA slots on your motherboard. ISA is the
2008 name of a bus system, i.e. the way the CPU talks to the other stuff
2009 inside your box. Other bus systems are PCI, EISA, MicroChannel
2010 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
2011 newer boards don't support it. If you have ISA, say Y, otherwise N.
2012
2013config EISA
2014 bool "EISA support"
2015 depends on ISA
2016 ---help---
2017 The Extended Industry Standard Architecture (EISA) bus was
2018 developed as an open alternative to the IBM MicroChannel bus.
2019
2020 The EISA bus provided some of the features of the IBM MicroChannel
2021 bus while maintaining backward compatibility with cards made for
2022 the older ISA bus. The EISA bus saw limited use between 1988 and
2023 1995 when it was made obsolete by the PCI bus.
2024
2025 Say Y here if you are building a kernel for an EISA-based machine.
2026
2027 Otherwise, say N.
2028
2029source "drivers/eisa/Kconfig"
2030
2031config MCA
Ingo Molnar72ee6eb2009-01-27 16:57:49 +01002032 bool "MCA support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002033 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002034 MicroChannel Architecture is found in some IBM PS/2 machines and
2035 laptops. It is a bus system similar to PCI or ISA. See
2036 <file:Documentation/mca.txt> (and especially the web page given
2037 there) before attempting to build an MCA bus kernel.
2038
2039source "drivers/mca/Kconfig"
2040
2041config SCx200
2042 tristate "NatSemi SCx200 support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002043 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002044 This provides basic support for National Semiconductor's
2045 (now AMD's) Geode processors. The driver probes for the
2046 PCI-IDs of several on-chip devices, so its a good dependency
2047 for other scx200_* drivers.
2048
2049 If compiled as a module, the driver is named scx200.
2050
2051config SCx200HR_TIMER
2052 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
John Stultz592913e2010-07-13 17:56:20 -07002053 depends on SCx200
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002054 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002055 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002056 This driver provides a clocksource built upon the on-chip
2057 27MHz high-resolution timer. Its also a workaround for
2058 NSC Geode SC-1100's buggy TSC, which loses time when the
2059 processor goes idle (as is done by the scheduler). The
2060 other workaround is idle=poll boot option.
2061
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002062config OLPC
2063 bool "One Laptop Per Child support"
Andres Salomon3c554942009-12-14 18:00:36 -08002064 select GPIOLIB
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002065 ---help---
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07002066 Add support for detecting the unique features of the OLPC
2067 XO hardware.
2068
Andres Salomonfd699c72010-06-18 17:46:53 -04002069config OLPC_OPENFIRMWARE
2070 bool "Support for OLPC's Open Firmware"
2071 depends on !X86_64 && !X86_PAE
2072 default y if OLPC
2073 help
2074 This option adds support for the implementation of Open Firmware
2075 that is used on the OLPC XO-1 Children's Machine.
2076 If unsure, say N here.
2077
Sam Ravnborgbc0120f2007-11-06 23:10:39 +01002078endif # X86_32
2079
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002080config K8_NB
2081 def_bool y
Borislav Petkov0e152cd2010-03-12 15:43:03 +01002082 depends on CPU_SUP_AMD && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002083
2084source "drivers/pcmcia/Kconfig"
2085
2086source "drivers/pci/hotplug/Kconfig"
2087
2088endmenu
2089
2090
2091menu "Executable file formats / Emulations"
2092
2093source "fs/Kconfig.binfmt"
2094
2095config IA32_EMULATION
2096 bool "IA32 Emulation"
2097 depends on X86_64
Roland McGratha97f52e2008-01-30 13:31:55 +01002098 select COMPAT_BINFMT_ELF
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002099 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002100 Include code to run 32-bit programs under a 64-bit kernel. You should
2101 likely turn this on, unless you're 100% sure that you don't have any
2102 32-bit programs left.
2103
2104config IA32_AOUT
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002105 tristate "IA32 a.out support"
2106 depends on IA32_EMULATION
2107 ---help---
2108 Support old a.out binaries in the 32bit emulation.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002109
2110config COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002111 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002112 depends on IA32_EMULATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002113
2114config COMPAT_FOR_U64_ALIGNMENT
2115 def_bool COMPAT
2116 depends on X86_64
2117
2118config SYSVIPC_COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002119 def_bool y
Alexey Dobriyanb8992192008-09-14 13:44:41 +04002120 depends on COMPAT && SYSVIPC
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002121
2122endmenu
2123
2124
Keith Packarde5beae12008-11-03 18:21:45 +01002125config HAVE_ATOMIC_IOMAP
2126 def_bool y
2127 depends on X86_32
2128
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002129source "net/Kconfig"
2130
2131source "drivers/Kconfig"
2132
2133source "drivers/firmware/Kconfig"
2134
2135source "fs/Kconfig"
2136
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002137source "arch/x86/Kconfig.debug"
2138
2139source "security/Kconfig"
2140
2141source "crypto/Kconfig"
2142
Avi Kivityedf88412007-12-16 11:02:48 +02002143source "arch/x86/kvm/Kconfig"
2144
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002145source "lib/Kconfig"