blob: b5cda6c03d1d7572c3188c2d6a98d33f042c9303 [file] [log] [blame]
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
Rik van Riel28b2ee22008-07-23 21:27:05 -070027 select HAVE_IOREMAP_PROT
Mathieu Desnoyers3f550092008-02-02 15:10:35 -050028 select HAVE_KPROBES
Ingo Molnar1f972762008-07-26 13:52:50 +020029 select ARCH_WANT_OPTIONAL_GPIOLIB
Ingo Molnarda4276b2009-01-07 11:05:10 +010030 select ARCH_WANT_FRAME_POINTERS
Ananth N Mavinakayanahalli9edddaa2008-03-04 14:28:37 -080031 select HAVE_KRETPROBES
Steven Rostedte4b2b882008-08-14 15:45:11 -040032 select HAVE_FTRACE_MCOUNT_RECORD
Steven Rostedt677aa9f2008-05-17 00:01:36 -040033 select HAVE_DYNAMIC_FTRACE
Steven Rostedt606576c2008-10-06 19:06:12 -040034 select HAVE_FUNCTION_TRACER
Frederic Weisbecker48d68b22008-12-02 00:20:39 +010035 select HAVE_FUNCTION_GRAPH_TRACER
Steven Rostedt60a7ecf2008-11-05 16:05:44 -050036 select HAVE_FUNCTION_TRACE_MCOUNT_TEST
Steven Rostedt9a5fd902009-02-06 01:14:26 -050037 select HAVE_FTRACE_NMI_ENTER if DYNAMIC_FTRACE
Frederic Weisbecker1b3fa2ce2009-03-07 05:53:00 +010038 select HAVE_FTRACE_SYSCALLS
Ingo Molnare0ec9482009-01-27 17:01:14 +010039 select HAVE_KVM
Ingo Molnar49793b02009-01-27 17:02:29 +010040 select HAVE_ARCH_KGDB
Roland McGrath99bbc4b2008-04-20 14:35:12 -070041 select HAVE_ARCH_TRACEHOOK
Dmitry Baryshkov323ec002008-06-29 14:19:31 +040042 select HAVE_GENERIC_DMA_COHERENT if X86_32
Johannes Berg58340a02008-07-25 01:45:33 -070043 select HAVE_EFFICIENT_UNALIGNED_ACCESS
Török Edwin8d264872008-11-23 12:39:08 +020044 select USER_STACKTRACE_SUPPORT
Joerg Roedel2118d0c2009-01-09 15:13:15 +010045 select HAVE_DMA_API_DEBUG
H. Peter Anvin2e9f3bd2009-01-04 15:41:25 -080046 select HAVE_KERNEL_GZIP
47 select HAVE_KERNEL_BZIP2
48 select HAVE_KERNEL_LZMA
Balbir Singh7d8330a2008-02-10 12:46:28 +053049
Sam Ravnborg73531902008-05-25 23:03:18 +020050config ARCH_DEFCONFIG
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +020051 string
Sam Ravnborg73531902008-05-25 23:03:18 +020052 default "arch/x86/configs/i386_defconfig" if X86_32
53 default "arch/x86/configs/x86_64_defconfig" if X86_64
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +020054
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010055config GENERIC_TIME
Harvey Harrison3c2362e2008-01-30 13:31:03 +010056 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010057
58config GENERIC_CMOS_UPDATE
Harvey Harrison3c2362e2008-01-30 13:31:03 +010059 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010060
61config CLOCKSOURCE_WATCHDOG
Harvey Harrison3c2362e2008-01-30 13:31:03 +010062 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010063
64config GENERIC_CLOCKEVENTS
Harvey Harrison3c2362e2008-01-30 13:31:03 +010065 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010066
67config GENERIC_CLOCKEVENTS_BROADCAST
Harvey Harrison3c2362e2008-01-30 13:31:03 +010068 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010069 depends on X86_64 || (X86_32 && X86_LOCAL_APIC)
70
71config LOCKDEP_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +010072 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010073
74config STACKTRACE_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +010075 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010076
Heiko Carstensaa7d9352008-02-01 17:45:14 +010077config HAVE_LATENCYTOP_SUPPORT
78 def_bool y
79
Christoph Lameter1f842602008-01-07 23:20:30 -080080config FAST_CMPXCHG_LOCAL
81 bool
82 default y
83
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010084config MMU
Harvey Harrison3c2362e2008-01-30 13:31:03 +010085 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010086
87config ZONE_DMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +010088 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010089
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010090config SBUS
91 bool
92
93config GENERIC_ISA_DMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +010094 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010095
96config GENERIC_IOMAP
Harvey Harrison3c2362e2008-01-30 13:31:03 +010097 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010098
99config GENERIC_BUG
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100100 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100101 depends on BUG
Jan Beulichb93a5312008-12-16 11:40:27 +0000102 select GENERIC_BUG_RELATIVE_POINTERS if X86_64
103
104config GENERIC_BUG_RELATIVE_POINTERS
105 bool
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100106
107config GENERIC_HWEIGHT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100108 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100109
Florian Fainellia6082952008-01-30 13:33:35 +0100110config GENERIC_GPIO
Jan Beulich9ba16082008-10-15 22:01:38 -0700111 bool
Florian Fainellia6082952008-01-30 13:33:35 +0100112
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100113config ARCH_MAY_HAVE_PC_FDC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100114 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100115
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100116config RWSEM_GENERIC_SPINLOCK
117 def_bool !X86_XADD
118
119config RWSEM_XCHGADD_ALGORITHM
120 def_bool X86_XADD
121
Venki Pallipadia6869cc2008-02-08 17:05:44 -0800122config ARCH_HAS_CPU_IDLE_WAIT
123 def_bool y
124
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100125config GENERIC_CALIBRATE_DELAY
126 def_bool y
127
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100128config GENERIC_TIME_VSYSCALL
129 bool
130 default X86_64
131
venkatesh.pallipadi@intel.com9a0b8412008-01-31 17:35:06 -0800132config ARCH_HAS_CPU_RELAX
133 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100134
Venkatesh Pallipadi89cedfe2008-10-16 19:00:08 -0400135config ARCH_HAS_DEFAULT_IDLE
136 def_bool y
137
Pekka Enberg1b27d052008-04-28 02:12:22 -0700138config ARCH_HAS_CACHE_LINE_SIZE
139 def_bool y
140
Mike Travisdd5af902008-01-30 13:33:32 +0100141config HAVE_SETUP_PER_CPU_AREA
Brian Gerst89c9c4c2009-01-27 12:56:48 +0900142 def_bool y
travis@sgi.comb32ef632008-01-30 13:32:51 +0100143
Tejun Heo11124412009-02-20 16:29:09 +0900144config HAVE_DYNAMIC_PER_CPU_AREA
145 def_bool y
146
Mike Travis9f0e8d02008-04-04 18:11:01 -0700147config HAVE_CPUMASK_OF_CPU_MAP
148 def_bool X86_64_SMP
149
Johannes Berg801e4062007-12-08 02:12:39 +0100150config ARCH_HIBERNATION_POSSIBLE
151 def_bool y
Johannes Berg801e4062007-12-08 02:12:39 +0100152
Johannes Bergf4cb5702007-12-08 02:14:00 +0100153config ARCH_SUSPEND_POSSIBLE
154 def_bool y
Johannes Bergf4cb5702007-12-08 02:14:00 +0100155
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100156config ZONE_DMA32
157 bool
158 default X86_64
159
160config ARCH_POPULATES_NODE_MAP
161 def_bool y
162
163config AUDIT_ARCH
164 bool
165 default X86_64
166
Ingo Molnar765c68b2008-04-09 11:03:37 +0200167config ARCH_SUPPORTS_OPTIMIZED_INLINING
168 def_bool y
169
Akinobu Mita6a11f752009-03-31 15:23:17 -0700170config ARCH_SUPPORTS_DEBUG_PAGEALLOC
171 def_bool y
172
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100173# Use the generic interrupt handling code in kernel/irq/:
174config GENERIC_HARDIRQS
175 bool
176 default y
177
Thomas Gleixnerf9a36fa2009-03-13 16:37:48 +0100178config GENERIC_HARDIRQS_NO__DO_IRQ
179 def_bool y
180
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100181config GENERIC_IRQ_PROBE
182 bool
183 default y
184
185config GENERIC_PENDING_IRQ
186 bool
187 depends on GENERIC_HARDIRQS && SMP
188 default y
189
James Bottomley6cd10f82008-11-09 11:53:14 -0600190config USE_GENERIC_SMP_HELPERS
191 def_bool y
192 depends on SMP
193
Sam Ravnborg6b0c3d42008-01-30 13:32:27 +0100194config X86_32_SMP
195 def_bool y
196 depends on X86_32 && SMP
197
198config X86_64_SMP
199 def_bool y
200 depends on X86_64 && SMP
201
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100202config X86_HT
203 bool
Adrian Bunkee0011a2007-12-04 17:19:07 +0100204 depends on SMP
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100205 default y
206
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100207config X86_TRAMPOLINE
208 bool
Ingo Molnar3e5095d2009-01-27 17:07:08 +0100209 depends on SMP || (64BIT && ACPI_SLEEP)
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100210 default y
211
Tejun Heoccbeed32009-02-09 22:17:40 +0900212config X86_32_LAZY_GS
213 def_bool y
Tejun Heo60a53172009-02-09 22:17:40 +0900214 depends on X86_32 && !CC_STACKPROTECTOR
Tejun Heoccbeed32009-02-09 22:17:40 +0900215
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100216config KTIME_SCALAR
217 def_bool X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100218source "init/Kconfig"
Matt Helsleydc52ddc2008-10-18 20:27:21 -0700219source "kernel/Kconfig.freezer"
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100220
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100221menu "Processor type and features"
222
223source "kernel/time/Kconfig"
224
225config SMP
226 bool "Symmetric multi-processing support"
227 ---help---
228 This enables support for systems with more than one CPU. If you have
229 a system with only one CPU, like most personal computers, say N. If
230 you have a system with more than one CPU, say Y.
231
232 If you say N here, the kernel will run on single and multiprocessor
233 machines, but will use only one CPU of a multiprocessor machine. If
234 you say Y here, the kernel will run on many, but not all,
235 singleprocessor machines. On a singleprocessor machine, the kernel
236 will run faster if you say N here.
237
238 Note that if you say Y here and choose architecture "586" or
239 "Pentium" under "Processor family", the kernel will not work on 486
240 architectures. Similarly, multiprocessor kernels for the "PPro"
241 architecture may not work on all Pentium based boards.
242
243 People using multiprocessor machines who say Y here should also say
244 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
245 Management" code will be disabled if you say Y here.
246
Adrian Bunk03502fa2008-02-03 15:50:21 +0200247 See also <file:Documentation/i386/IO-APIC.txt>,
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100248 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
249 <http://www.tldp.org/docs.html#howto>.
250
251 If you don't know what to do here, say N.
252
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800253config X86_X2APIC
254 bool "Support x2apic"
David Woodhousef7d7f862009-04-06 23:04:40 -0700255 depends on X86_LOCAL_APIC && X86_64 && INTR_REMAP
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800256 ---help---
257 This enables x2apic support on CPUs that have this feature.
258
259 This allows 32-bit apic IDs (so it can support very large systems),
260 and accesses the local apic via MSRs not via mmio.
261
Yinghai Lu06cd9a72009-02-16 17:29:58 -0800262 If you don't know what to do here, say N.
263
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800264config SPARSE_IRQ
265 bool "Support sparse irq numbering"
Yinghai Lu17483a12008-12-12 13:14:18 -0800266 depends on PCI_MSI || HT_IRQ
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100267 ---help---
Ingo Molnar973656f2008-12-25 16:26:47 +0100268 This enables support for sparse irqs. This is useful for distro
269 kernels that want to define a high CONFIG_NR_CPUS value but still
270 want to have low kernel memory footprint on smaller machines.
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800271
Ingo Molnar973656f2008-12-25 16:26:47 +0100272 ( Sparse IRQs can also be beneficial on NUMA boxes, as they spread
273 out the irq_desc[] array in a more NUMA-friendly way. )
274
275 If you don't know what to do here, say N.
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800276
Yinghai Lu48a1b102008-12-11 00:15:01 -0800277config NUMA_MIGRATE_IRQ_DESC
278 bool "Move irq desc when changing irq smp_affinity"
Yinghai Lub9098952008-12-19 13:48:34 -0800279 depends on SPARSE_IRQ && NUMA
Yinghai Lu48a1b102008-12-11 00:15:01 -0800280 default n
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100281 ---help---
Yinghai Lu48a1b102008-12-11 00:15:01 -0800282 This enables moving irq_desc to cpu/node that irq will use handled.
283
284 If you don't know what to do here, say N.
285
Yinghai Lu6695c852008-06-19 12:13:09 -0700286config X86_MPPARSE
Jan Beulich7a527682008-10-30 10:38:24 +0000287 bool "Enable MPS table" if ACPI
288 default y
Ingo Molnar5ab74722008-07-10 14:42:03 +0200289 depends on X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100290 ---help---
Yinghai Lu6695c852008-06-19 12:13:09 -0700291 For old smp systems that do not have proper acpi support. Newer systems
292 (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
Yinghai Lu6695c852008-06-19 12:13:09 -0700293
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800294config X86_BIGSMP
295 bool "Support for big SMP systems with more than 8 CPUs"
296 depends on X86_32 && SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100297 ---help---
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800298 This option is needed for the systems that have more than 8 CPUs
299
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800300if X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800301config X86_EXTENDED_PLATFORM
302 bool "Support for extended (non-PC) x86 platforms"
303 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100304 ---help---
Ingo Molnar06ac8342009-01-27 18:11:43 +0100305 If you disable this option then the kernel will only support
306 standard PC platforms. (which covers the vast majority of
307 systems out there.)
308
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800309 If you enable this option then you'll be able to select support
310 for the following (non-PC) 32 bit x86 platforms:
311 AMD Elan
312 NUMAQ (IBM/Sequent)
313 RDC R-321x SoC
314 SGI 320/540 (Visual Workstation)
315 Summit/EXA (IBM x440)
316 Unisys ES7000 IA32 series
Ingo Molnar06ac8342009-01-27 18:11:43 +0100317
318 If you have one of these systems, or if you want to build a
319 generic distribution kernel, say Y here - otherwise say N.
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800320endif
Ingo Molnar06ac8342009-01-27 18:11:43 +0100321
Ravikiran G Thirumalai84250912009-02-20 16:59:11 -0800322if X86_64
323config X86_EXTENDED_PLATFORM
324 bool "Support for extended (non-PC) x86 platforms"
325 default y
326 ---help---
327 If you disable this option then the kernel will only support
328 standard PC platforms. (which covers the vast majority of
329 systems out there.)
330
331 If you enable this option then you'll be able to select support
332 for the following (non-PC) 64 bit x86 platforms:
333 ScaleMP vSMP
334 SGI Ultraviolet
335
336 If you have one of these systems, or if you want to build a
337 generic distribution kernel, say Y here - otherwise say N.
338endif
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800339# This is an alphabetically sorted list of 64 bit extended platforms
340# Please maintain the alphabetic order if and when there are additions
Nick Piggin03b48632009-01-20 04:36:04 +0100341
Ingo Molnar6a485652009-01-27 18:29:13 +0100342config X86_VSMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800343 bool "ScaleMP vSMP"
Ingo Molnar6a485652009-01-27 18:29:13 +0100344 select PARAVIRT
345 depends on X86_64 && PCI
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800346 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100347 ---help---
Ingo Molnar6a485652009-01-27 18:29:13 +0100348 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
349 supposed to run on these EM64T-based machines. Only choose this option
350 if you have one of these machines.
351
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800352config X86_UV
353 bool "SGI Ultraviolet"
354 depends on X86_64
355 depends on X86_EXTENDED_PLATFORM
Jack Steiner54c28d22009-04-03 15:39:42 -0500356 depends on NUMA
Ingo Molnar7d01d322009-02-17 12:33:20 +0100357 select X86_X2APIC
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800358 ---help---
359 This option is needed in order to support SGI Ultraviolet systems.
360 If you don't have one of these, you should say N here.
361
362# Following is an alphabetically sorted list of 32 bit extended platforms
363# Please maintain the alphabetic order if and when there are additions
364
Ingo Molnar9e111f32009-01-27 18:18:25 +0100365config X86_ELAN
366 bool "AMD Elan"
367 depends on X86_32
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800368 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100369 ---help---
Ingo Molnar9e111f32009-01-27 18:18:25 +0100370 Select this for an AMD Elan processor.
371
372 Do not use this option for K6/Athlon/Opteron processors!
373
374 If unsure, choose "PC-compatible" instead.
375
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800376config X86_RDC321X
377 bool "RDC R-321x SoC"
378 depends on X86_32
379 depends on X86_EXTENDED_PLATFORM
380 select M486
381 select X86_REBOOTFIXUPS
382 ---help---
383 This option is needed for RDC R-321x system-on-chip, also known
384 as R-8610-(G).
385 If you don't have one of these chips, you should say N here.
386
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100387config X86_32_NON_STANDARD
Ingo Molnar9c398012009-01-27 18:24:57 +0100388 bool "Support non-standard 32-bit SMP architectures"
389 depends on X86_32 && SMP
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800390 depends on X86_EXTENDED_PLATFORM
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100391 ---help---
392 This option compiles in the NUMAQ, Summit, bigsmp, ES7000, default
Ingo Molnar9c398012009-01-27 18:24:57 +0100393 subarchitectures. It is intended for a generic binary kernel.
394 if you select them all, kernel will probe it one by one. and will
395 fallback to default.
396
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800397# Alphabetically sorted list of Non standard 32 bit platforms
398
Ingo Molnar9c398012009-01-27 18:24:57 +0100399config X86_NUMAQ
400 bool "NUMAQ (IBM/Sequent)"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100401 depends on X86_32_NON_STANDARD
Ingo Molnar9c398012009-01-27 18:24:57 +0100402 select NUMA
403 select X86_MPPARSE
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100404 ---help---
Ingo Molnar9c398012009-01-27 18:24:57 +0100405 This option is used for getting Linux to run on a NUMAQ (IBM/Sequent)
406 NUMA multiquad box. This changes the way that processors are
407 bootstrapped, and uses Clustered Logical APIC addressing mode instead
408 of Flat Logical. You will need a new lynxer.elf file to flash your
409 firmware with - send email to <Martin.Bligh@us.ibm.com>.
410
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800411config X86_VISWS
412 bool "SGI 320/540 (Visual Workstation)"
413 depends on X86_32 && PCI && X86_MPPARSE && PCI_GODIRECT
414 depends on X86_32_NON_STANDARD
415 ---help---
416 The SGI Visual Workstation series is an IA32-based workstation
417 based on SGI systems chips with some legacy PC hardware attached.
418
419 Say Y here to create a kernel to run on the SGI 320 or 540.
420
421 A kernel compiled for the Visual Workstation will run on general
422 PCs as well. See <file:Documentation/sgi-visws.txt> for details.
423
Ingo Molnar9c398012009-01-27 18:24:57 +0100424config X86_SUMMIT
425 bool "Summit/EXA (IBM x440)"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100426 depends on X86_32_NON_STANDARD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100427 ---help---
Ingo Molnar9c398012009-01-27 18:24:57 +0100428 This option is needed for IBM systems that use the Summit/EXA chipset.
429 In particular, it is needed for the x440.
430
431config X86_ES7000
Ravikiran G Thirumalaic5c606d2009-02-09 18:18:14 -0800432 bool "Unisys ES7000 IA32 series"
Yinghai Lu26f7ef12009-01-29 14:19:22 -0800433 depends on X86_32_NON_STANDARD && X86_BIGSMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100434 ---help---
Ingo Molnar9c398012009-01-27 18:24:57 +0100435 Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
436 supposed to run on an IA32-based Unisys ES7000 system.
437
Ingo Molnarae1e9132008-11-11 09:05:16 +0100438config SCHED_OMIT_FRAME_POINTER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100439 def_bool y
440 prompt "Single-depth WCHAN output"
Ken Chena87d0912008-11-06 11:10:49 -0800441 depends on X86
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100442 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100443 Calculate simpler /proc/<PID>/wchan values. If this option
444 is disabled then wchan values will recurse back to the
445 caller function. This provides more accurate wchan values,
446 at the expense of slightly more scheduling overhead.
447
448 If in doubt, say "Y".
449
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100450menuconfig PARAVIRT_GUEST
451 bool "Paravirtualized guest support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100452 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100453 Say Y here to get to see options related to running Linux under
454 various hypervisors. This option alone does not add any kernel code.
455
456 If you say N, all options in this submenu will be skipped and disabled.
457
458if PARAVIRT_GUEST
459
460source "arch/x86/xen/Kconfig"
461
462config VMI
463 bool "VMI Guest support"
464 select PARAVIRT
Eduardo Pereira Habkost42d545c2008-01-30 13:33:32 +0100465 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100466 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100467 VMI provides a paravirtualized interface to the VMware ESX server
468 (it could be used by other hypervisors in theory too, but is not
469 at the moment), by linking the kernel to a GPL-ed ROM module
470 provided by the hypervisor.
471
Glauber de Oliveira Costa790c73f2008-02-15 17:52:48 -0200472config KVM_CLOCK
473 bool "KVM paravirtualized clock"
474 select PARAVIRT
Gerd Hoffmannf6e16d52008-06-03 16:17:32 +0200475 select PARAVIRT_CLOCK
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100476 ---help---
Glauber de Oliveira Costa790c73f2008-02-15 17:52:48 -0200477 Turning on this option will allow you to run a paravirtualized clock
478 when running over the KVM hypervisor. Instead of relying on a PIT
479 (or probably other) emulation by the underlying device model, the host
480 provides the guest with timing infrastructure such as time of day, and
481 system time
482
Marcelo Tosatti0cf1bfd2008-02-22 12:21:36 -0500483config KVM_GUEST
484 bool "KVM Guest support"
485 select PARAVIRT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100486 ---help---
487 This option enables various optimizations for running under the KVM
488 hypervisor.
Marcelo Tosatti0cf1bfd2008-02-22 12:21:36 -0500489
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100490source "arch/x86/lguest/Kconfig"
491
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100492config PARAVIRT
493 bool "Enable paravirtualization code"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100494 ---help---
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100495 This changes the kernel so it can modify itself when it is run
496 under a hypervisor, potentially improving performance significantly
497 over full virtualization. However, when run without a hypervisor
498 the kernel is theoretically slower and slightly larger.
499
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200500config PARAVIRT_CLOCK
501 bool
502 default n
503
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100504endif
505
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400506config PARAVIRT_DEBUG
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100507 bool "paravirt-ops debugging"
508 depends on PARAVIRT && DEBUG_KERNEL
509 ---help---
510 Enable to debug paravirt_ops internals. Specifically, BUG if
511 a paravirt_op is missing when it is called.
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400512
Yinghai Lu03273182008-04-18 17:49:15 -0700513config MEMTEST
514 bool "Memtest"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100515 ---help---
Yinghai Luc64df702008-03-21 18:56:19 -0700516 This option adds a kernel parameter 'memtest', which allows memtest
Yinghai Lu03273182008-04-18 17:49:15 -0700517 to be set.
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100518 memtest=0, mean disabled; -- default
519 memtest=1, mean do 1 test pattern;
520 ...
521 memtest=4, mean do 4 test patterns.
Thomas Gleixneraba37282008-07-15 14:48:48 +0200522 If you are unsure how to answer this question, answer N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100523
524config X86_SUMMIT_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100525 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100526 depends on X86_32 && NUMA && X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100527
528config X86_CYCLONE_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100529 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100530 depends on X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100531
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100532source "arch/x86/Kconfig.cpu"
533
534config HPET_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100535 def_bool X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100536 prompt "HPET Timer Support" if X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100537 ---help---
538 Use the IA-PC HPET (High Precision Event Timer) to manage
539 time in preference to the PIT and RTC, if a HPET is
540 present.
541 HPET is the next generation timer replacing legacy 8254s.
542 The HPET provides a stable time base on SMP
543 systems, unlike the TSC, but it is more expensive to access,
544 as it is off-chip. You can find the HPET spec at
545 <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100546
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100547 You can safely choose Y here. However, HPET will only be
548 activated if the platform and the BIOS support this feature.
549 Otherwise the 8254 will be used for timing services.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100550
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100551 Choose N to continue using the legacy 8254 timer.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100552
553config HPET_EMULATE_RTC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100554 def_bool y
Bernhard Walle9d8af782008-02-06 01:38:52 -0800555 depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100556
557# Mark as embedded because too many people got it wrong.
558# The code disables itself when not needed.
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700559config DMI
560 default y
561 bool "Enable DMI scanning" if EMBEDDED
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100562 ---help---
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700563 Enabled scanning of DMI to identify machine quirks. Say Y
564 here unless you have verified that your setup is not
565 affected by entries in the DMI blacklist. Required by PNP
566 BIOS code.
567
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100568config GART_IOMMU
569 bool "GART IOMMU support" if EMBEDDED
570 default y
571 select SWIOTLB
572 select AGP
573 depends on X86_64 && PCI
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100574 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100575 Support for full DMA access of devices with 32bit memory access only
576 on systems with more than 3GB. This is usually needed for USB,
577 sound, many IDE/SATA chipsets and some other devices.
578 Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
579 based hardware IOMMU and a software bounce buffer based IOMMU used
580 on Intel systems and as fallback.
581 The code is only active when needed (enough memory and limited
582 device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
583 too.
584
585config CALGARY_IOMMU
586 bool "IBM Calgary IOMMU support"
587 select SWIOTLB
588 depends on X86_64 && PCI && EXPERIMENTAL
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100589 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100590 Support for hardware IOMMUs in IBM's xSeries x366 and x460
591 systems. Needed to run systems with more than 3GB of memory
592 properly with 32-bit PCI devices that do not support DAC
593 (Double Address Cycle). Calgary also supports bus level
594 isolation, where all DMAs pass through the IOMMU. This
595 prevents them from going anywhere except their intended
596 destination. This catches hard-to-find kernel bugs and
597 mis-behaving drivers and devices that do not use the DMA-API
598 properly to set up their DMA buffers. The IOMMU can be
599 turned off at boot time with the iommu=off parameter.
600 Normally the kernel will make the right choice by itself.
601 If unsure, say Y.
602
603config CALGARY_IOMMU_ENABLED_BY_DEFAULT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100604 def_bool y
605 prompt "Should Calgary be enabled by default?"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100606 depends on CALGARY_IOMMU
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100607 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100608 Should Calgary be enabled by default? if you choose 'y', Calgary
609 will be used (if it exists). If you choose 'n', Calgary will not be
610 used even if it exists. If you choose 'n' and would like to use
611 Calgary anyway, pass 'iommu=calgary' on the kernel command line.
612 If unsure, say Y.
613
Joerg Roedel2b188722008-06-26 21:27:37 +0200614config AMD_IOMMU
615 bool "AMD IOMMU support"
Ingo Molnar07c40e82008-06-27 11:31:28 +0200616 select SWIOTLB
Joerg Roedela80dc3e2008-09-11 16:51:41 +0200617 select PCI_MSI
Ingo Molnar24d2ba02008-06-27 10:37:03 +0200618 depends on X86_64 && PCI && ACPI
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100619 ---help---
Joerg Roedel18d22202008-07-03 19:35:06 +0200620 With this option you can enable support for AMD IOMMU hardware in
621 your system. An IOMMU is a hardware component which provides
622 remapping of DMA memory accesses from devices. With an AMD IOMMU you
623 can isolate the the DMA memory of different devices and protect the
624 system from misbehaving device drivers or hardware.
625
626 You can find out if your system has an AMD IOMMU if you look into
627 your BIOS for an option to enable it or if you have an IVRS ACPI
628 table.
Joerg Roedel2b188722008-06-26 21:27:37 +0200629
Joerg Roedel2e117602008-12-11 19:00:12 +0100630config AMD_IOMMU_STATS
631 bool "Export AMD IOMMU statistics to debugfs"
632 depends on AMD_IOMMU
633 select DEBUG_FS
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100634 ---help---
Joerg Roedel2e117602008-12-11 19:00:12 +0100635 This option enables code in the AMD IOMMU driver to collect various
636 statistics about whats happening in the driver and exports that
637 information to userspace via debugfs.
638 If unsure, say N.
639
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100640# need this always selected by IOMMU for the VIA workaround
641config SWIOTLB
Joerg Roedela1afd012008-11-18 12:44:21 +0100642 def_bool y if X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100643 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100644 Support for software bounce buffers used on x86-64 systems
645 which don't have a hardware IOMMU (e.g. the current generation
646 of Intel's x86-64 CPUs). Using this PCI devices which can only
647 access 32-bits of memory can be used on systems with more than
648 3 GB of memory. If unsure, say Y.
649
FUJITA Tomonoria8522502008-04-29 00:59:36 -0700650config IOMMU_HELPER
FUJITA Tomonori18b743d2008-07-10 09:50:50 +0900651 def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU)
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700652
Joerg Roedel1aaf1182008-11-26 17:25:13 +0100653config IOMMU_API
654 def_bool (AMD_IOMMU || DMAR)
655
Mike Travis1184dc22008-05-12 21:21:12 +0200656config MAXSMP
657 bool "Configure Maximum number of SMP Processors and NUMA Nodes"
Mike Travis36f51012008-12-16 17:33:51 -0800658 depends on X86_64 && SMP && DEBUG_KERNEL && EXPERIMENTAL
659 select CPUMASK_OFFSTACK
Mike Travis1184dc22008-05-12 21:21:12 +0200660 default n
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100661 ---help---
Mike Travis1184dc22008-05-12 21:21:12 +0200662 Configure maximum number of CPUS and NUMA Nodes for this architecture.
663 If unsure, say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100664
665config NR_CPUS
Mike Travis36f51012008-12-16 17:33:51 -0800666 int "Maximum number of CPUs" if SMP && !MAXSMP
Michael K. Johnson2a3313f2009-04-21 21:44:48 -0400667 range 2 8 if SMP && X86_32 && !X86_BIGSMP
Mike Travis36f51012008-12-16 17:33:51 -0800668 range 2 512 if SMP && !MAXSMP
Mike Travis78637a972008-12-16 17:34:00 -0800669 default "1" if !SMP
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700670 default "4096" if MAXSMP
Mike Travis78637a972008-12-16 17:34:00 -0800671 default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000)
672 default "8" if SMP
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100673 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100674 This allows you to specify the maximum number of CPUs which this
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700675 kernel will support. The maximum supported value is 512 and the
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100676 minimum value which makes sense is 2.
677
678 This is purely to save memory - each supported CPU adds
679 approximately eight kilobytes to the kernel image.
680
681config SCHED_SMT
682 bool "SMT (Hyperthreading) scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800683 depends on X86_HT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100684 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100685 SMT scheduler support improves the CPU scheduler's decision making
686 when dealing with Intel Pentium 4 chips with HyperThreading at a
687 cost of slightly increased overhead in some places. If unsure say
688 N here.
689
690config SCHED_MC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100691 def_bool y
692 prompt "Multi-core scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800693 depends on X86_HT
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100694 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100695 Multi-core scheduler support improves the CPU scheduler's decision
696 making when dealing with multi-core CPU chips at a cost of slightly
697 increased overhead in some places. If unsure say N here.
698
699source "kernel/Kconfig.preempt"
700
701config X86_UP_APIC
702 bool "Local APIC support on uniprocessors"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100703 depends on X86_32 && !SMP && !X86_32_NON_STANDARD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100704 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100705 A local APIC (Advanced Programmable Interrupt Controller) is an
706 integrated interrupt controller in the CPU. If you have a single-CPU
707 system which has a processor with a local APIC, you can say Y here to
708 enable and use it. If you say Y here even though your machine doesn't
709 have a local APIC, then the kernel will still run with no slowdown at
710 all. The local APIC supports CPU-generated self-interrupts (timer,
711 performance counters), and the NMI watchdog which detects hard
712 lockups.
713
714config X86_UP_IOAPIC
715 bool "IO-APIC support on uniprocessors"
716 depends on X86_UP_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100717 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100718 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
719 SMP-capable replacement for PC-style interrupt controllers. Most
720 SMP systems and many recent uniprocessor systems have one.
721
722 If you have a single-CPU system with an IO-APIC, you can say Y here
723 to use it. If you say Y here even though your machine doesn't have
724 an IO-APIC, then the kernel will still run with no slowdown at all.
725
726config X86_LOCAL_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100727 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100728 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100729
730config X86_IO_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100731 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100732 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100733
734config X86_VISWS_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100735 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100736 depends on X86_32 && X86_VISWS
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100737
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200738config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
739 bool "Reroute for broken boot IRQs"
740 default n
741 depends on X86_IO_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100742 ---help---
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200743 This option enables a workaround that fixes a source of
744 spurious interrupts. This is recommended when threaded
745 interrupt handling is used on systems where the generation of
746 superfluous "boot interrupts" cannot be disabled.
747
748 Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
749 entry in the chipset's IO-APIC is masked (as, e.g. the RT
750 kernel does during interrupt handling). On chipsets where this
751 boot IRQ generation cannot be disabled, this workaround keeps
752 the original IRQ line masked so that only the equivalent "boot
753 IRQ" is delivered to the CPUs. The workaround also tells the
754 kernel to set up the IRQ handler on the boot IRQ line. In this
755 way only one interrupt is delivered to the kernel. Otherwise
756 the spurious second interrupt may cause the kernel to bring
757 down (vital) interrupt lines.
758
759 Only affects "broken" chipsets. Interrupt sharing may be
760 increased on these systems.
761
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100762config X86_MCE
763 bool "Machine Check Exception"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100764 ---help---
765 Machine Check Exception support allows the processor to notify the
766 kernel if it detects a problem (e.g. overheating, component failure).
767 The action the kernel takes depends on the severity of the problem,
768 ranging from a warning message on the console, to halting the machine.
769 Your processor must be a Pentium or newer to support this - check the
770 flags in /proc/cpuinfo for mce. Note that some older Pentium systems
771 have a design flaw which leads to false MCE events - hence MCE is
772 disabled on all P5 processors, unless explicitly enabled with "mce"
773 as a boot argument. Similarly, if MCE is built in and creates a
774 problem on some new non-standard machine, you can boot with "nomce"
775 to disable it. MCE support simply ignores non-MCE processors like
776 the 386 and 486, so nearly everyone can say Y here.
777
778config X86_MCE_INTEL
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100779 def_bool y
780 prompt "Intel MCE features"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100781 depends on X86_64 && X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100782 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100783 Additional support for intel specific MCE features such as
784 the thermal monitor.
785
786config X86_MCE_AMD
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100787 def_bool y
788 prompt "AMD MCE features"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100789 depends on X86_64 && X86_MCE && X86_LOCAL_APIC
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100790 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100791 Additional support for AMD specific MCE features such as
792 the DRAM Error Threshold.
793
Andi Kleenb2762682009-02-12 13:49:31 +0100794config X86_MCE_THRESHOLD
795 depends on X86_MCE_AMD || X86_MCE_INTEL
796 bool
797 default y
798
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100799config X86_MCE_NONFATAL
800 tristate "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4"
801 depends on X86_32 && X86_MCE
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100802 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100803 Enabling this feature starts a timer that triggers every 5 seconds which
804 will look at the machine check registers to see if anything happened.
805 Non-fatal problems automatically get corrected (but still logged).
806 Disable this if you don't want to see these messages.
807 Seeing the messages this option prints out may be indicative of dying
808 or out-of-spec (ie, overclocked) hardware.
809 This option only does something on certain CPUs.
810 (AMD Athlon/Duron and Intel Pentium 4)
811
812config X86_MCE_P4THERMAL
813 bool "check for P4 thermal throttling interrupt."
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200814 depends on X86_32 && X86_MCE && (X86_UP_APIC || SMP)
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100815 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100816 Enabling this feature will cause a message to be printed when the P4
817 enters thermal throttling.
818
819config VM86
820 bool "Enable VM86 support" if EMBEDDED
821 default y
822 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100823 ---help---
824 This option is required by programs like DOSEMU to run 16-bit legacy
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100825 code on X86 processors. It also may be needed by software like
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100826 XFree86 to initialize some video cards via BIOS. Disabling this
827 option saves about 6k.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100828
829config TOSHIBA
830 tristate "Toshiba Laptop support"
831 depends on X86_32
832 ---help---
833 This adds a driver to safely access the System Management Mode of
834 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
835 not work on models with a Phoenix BIOS. The System Management Mode
836 is used to set the BIOS and power saving options on Toshiba portables.
837
838 For information on utilities to make use of this driver see the
839 Toshiba Linux utilities web site at:
840 <http://www.buzzard.org.uk/toshiba/>.
841
842 Say Y if you intend to run this kernel on a Toshiba portable.
843 Say N otherwise.
844
845config I8K
846 tristate "Dell laptop support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100847 ---help---
848 This adds a driver to safely access the System Management Mode
849 of the CPU on the Dell Inspiron 8000. The System Management Mode
850 is used to read cpu temperature and cooling fan status and to
851 control the fans on the I8K portables.
852
853 This driver has been tested only on the Inspiron 8000 but it may
854 also work with other Dell laptops. You can force loading on other
855 models by passing the parameter `force=1' to the module. Use at
856 your own risk.
857
858 For information on utilities to make use of this driver see the
859 I8K Linux utilities web site at:
860 <http://people.debian.org/~dz/i8k/>
861
862 Say Y if you intend to run this kernel on a Dell Inspiron 8000.
863 Say N otherwise.
864
865config X86_REBOOTFIXUPS
Jan Beulich9ba16082008-10-15 22:01:38 -0700866 bool "Enable X86 board specific fixups for reboot"
867 depends on X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100868 ---help---
869 This enables chipset and/or board specific fixups to be done
870 in order to get reboot to work correctly. This is only needed on
871 some combinations of hardware and BIOS. The symptom, for which
872 this config is intended, is when reboot ends with a stalled/hung
873 system.
874
875 Currently, the only fixup is for the Geode machines using
Florian Fainelli5e3a77e2008-01-30 13:33:36 +0100876 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100877
878 Say Y if you want to enable the fixup. Currently, it's safe to
879 enable this option even if you don't need it.
880 Say N otherwise.
881
882config MICROCODE
Peter Oruba8d86f392008-07-28 18:44:21 +0200883 tristate "/dev/cpu/microcode - microcode support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100884 select FW_LOADER
885 ---help---
886 If you say Y here, you will be able to update the microcode on
Peter Oruba80cc9f12008-07-28 18:44:22 +0200887 certain Intel and AMD processors. The Intel support is for the
888 IA32 family, e.g. Pentium Pro, Pentium II, Pentium III,
889 Pentium 4, Xeon etc. The AMD support is for family 0x10 and
890 0x11 processors, e.g. Opteron, Phenom and Turion 64 Ultra.
891 You will obviously need the actual microcode binary data itself
892 which is not shipped with the Linux kernel.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100893
Peter Oruba8d86f392008-07-28 18:44:21 +0200894 This option selects the general module only, you need to select
895 at least one vendor specific module as well.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100896
897 To compile this driver as a module, choose M here: the
898 module will be called microcode.
899
Peter Oruba8d86f392008-07-28 18:44:21 +0200900config MICROCODE_INTEL
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100901 bool "Intel microcode patch loading support"
902 depends on MICROCODE
903 default MICROCODE
904 select FW_LOADER
905 ---help---
906 This options enables microcode patch loading support for Intel
907 processors.
Peter Oruba8d86f392008-07-28 18:44:21 +0200908
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100909 For latest news and information on obtaining all the required
910 Intel ingredients for this driver, check:
911 <http://www.urbanmyth.org/microcode/>.
Peter Oruba8d86f392008-07-28 18:44:21 +0200912
Peter Oruba80cc9f12008-07-28 18:44:22 +0200913config MICROCODE_AMD
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100914 bool "AMD microcode patch loading support"
915 depends on MICROCODE
916 select FW_LOADER
917 ---help---
918 If you select this option, microcode patch loading support for AMD
919 processors will be enabled.
Peter Oruba80cc9f12008-07-28 18:44:22 +0200920
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100921config MICROCODE_OLD_INTERFACE
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100922 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100923 depends on MICROCODE
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100924
925config X86_MSR
926 tristate "/dev/cpu/*/msr - Model-specific register support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100927 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100928 This device gives privileged processes access to the x86
929 Model-Specific Registers (MSRs). It is a character device with
930 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
931 MSR accesses are directed to a specific CPU on multi-processor
932 systems.
933
934config X86_CPUID
935 tristate "/dev/cpu/*/cpuid - CPU information support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100936 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100937 This device gives processes access to the x86 CPUID instruction to
938 be executed on a specific processor. It is a character device
939 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
940 /dev/cpu/31/cpuid.
941
Jaswinder Singh Rajput9b779ed2009-03-10 15:37:51 +0530942config X86_CPU_DEBUG
943 tristate "/sys/kernel/debug/x86/cpu/* - CPU Debug support"
944 ---help---
945 If you select this option, this will provide various x86 CPUs
946 information through debugfs.
947
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100948choice
949 prompt "High Memory Support"
950 default HIGHMEM4G if !X86_NUMAQ
951 default HIGHMEM64G if X86_NUMAQ
952 depends on X86_32
953
954config NOHIGHMEM
955 bool "off"
956 depends on !X86_NUMAQ
957 ---help---
958 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
959 However, the address space of 32-bit x86 processors is only 4
960 Gigabytes large. That means that, if you have a large amount of
961 physical memory, not all of it can be "permanently mapped" by the
962 kernel. The physical memory that's not permanently mapped is called
963 "high memory".
964
965 If you are compiling a kernel which will never run on a machine with
966 more than 1 Gigabyte total physical RAM, answer "off" here (default
967 choice and suitable for most users). This will result in a "3GB/1GB"
968 split: 3GB are mapped so that each process sees a 3GB virtual memory
969 space and the remaining part of the 4GB virtual memory space is used
970 by the kernel to permanently map as much physical memory as
971 possible.
972
973 If the machine has between 1 and 4 Gigabytes physical RAM, then
974 answer "4GB" here.
975
976 If more than 4 Gigabytes is used then answer "64GB" here. This
977 selection turns Intel PAE (Physical Address Extension) mode on.
978 PAE implements 3-level paging on IA32 processors. PAE is fully
979 supported by Linux, PAE mode is implemented on all recent Intel
980 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
981 then the kernel will not boot on CPUs that don't support PAE!
982
983 The actual amount of total physical memory will either be
984 auto detected or can be forced by using a kernel command line option
985 such as "mem=256M". (Try "man bootparam" or see the documentation of
986 your boot loader (lilo or loadlin) about how to pass options to the
987 kernel at boot time.)
988
989 If unsure, say "off".
990
991config HIGHMEM4G
992 bool "4GB"
993 depends on !X86_NUMAQ
Ingo Molnar8f9ca472009-02-05 16:21:53 +0100994 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100995 Select this if you have a 32-bit processor and between 1 and 4
996 gigabytes of physical RAM.
997
998config HIGHMEM64G
999 bool "64GB"
1000 depends on !M386 && !M486
1001 select X86_PAE
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001002 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001003 Select this if you have a 32-bit processor and more than 4
1004 gigabytes of physical RAM.
1005
1006endchoice
1007
1008choice
1009 depends on EXPERIMENTAL
1010 prompt "Memory split" if EMBEDDED
1011 default VMSPLIT_3G
1012 depends on X86_32
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001013 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001014 Select the desired split between kernel and user memory.
1015
1016 If the address range available to the kernel is less than the
1017 physical memory installed, the remaining memory will be available
1018 as "high memory". Accessing high memory is a little more costly
1019 than low memory, as it needs to be mapped into the kernel first.
1020 Note that increasing the kernel address space limits the range
1021 available to user programs, making the address space there
1022 tighter. Selecting anything other than the default 3G/1G split
1023 will also likely make your kernel incompatible with binary-only
1024 kernel modules.
1025
1026 If you are not absolutely sure what you are doing, leave this
1027 option alone!
1028
1029 config VMSPLIT_3G
1030 bool "3G/1G user/kernel split"
1031 config VMSPLIT_3G_OPT
1032 depends on !X86_PAE
1033 bool "3G/1G user/kernel split (for full 1G low memory)"
1034 config VMSPLIT_2G
1035 bool "2G/2G user/kernel split"
1036 config VMSPLIT_2G_OPT
1037 depends on !X86_PAE
1038 bool "2G/2G user/kernel split (for full 2G low memory)"
1039 config VMSPLIT_1G
1040 bool "1G/3G user/kernel split"
1041endchoice
1042
1043config PAGE_OFFSET
1044 hex
1045 default 0xB0000000 if VMSPLIT_3G_OPT
1046 default 0x80000000 if VMSPLIT_2G
1047 default 0x78000000 if VMSPLIT_2G_OPT
1048 default 0x40000000 if VMSPLIT_1G
1049 default 0xC0000000
1050 depends on X86_32
1051
1052config HIGHMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001053 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001054 depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001055
1056config X86_PAE
Jan Beulich9ba16082008-10-15 22:01:38 -07001057 bool "PAE (Physical Address Extension) Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001058 depends on X86_32 && !HIGHMEM4G
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001059 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001060 PAE is required for NX support, and furthermore enables
1061 larger swapspace support for non-overcommit purposes. It
1062 has the cost of more pagetable lookup overhead, and also
1063 consumes more pagetable space per process.
1064
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001065config ARCH_PHYS_ADDR_T_64BIT
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001066 def_bool X86_64 || X86_PAE
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001067
Nick Piggin9e899812008-10-22 12:33:16 +02001068config DIRECT_GBPAGES
1069 bool "Enable 1GB pages for kernel pagetables" if EMBEDDED
1070 default y
1071 depends on X86_64
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001072 ---help---
Nick Piggin9e899812008-10-22 12:33:16 +02001073 Allow the kernel linear mapping to use 1GB pages on CPUs that
1074 support it. This can improve the kernel's performance a tiny bit by
1075 reducing TLB pressure. If in doubt, say "Y".
1076
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001077# Common NUMA Features
1078config NUMA
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001079 bool "Numa Memory Allocation and Scheduler Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001080 depends on SMP
Yinghai Lu0699eae2008-06-17 15:39:01 -07001081 depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL)
Yinghai Lu0699eae2008-06-17 15:39:01 -07001082 default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001083 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001084 Enable NUMA (Non Uniform Memory Access) support.
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001085
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001086 The kernel will try to allocate memory used by a CPU on the
1087 local memory controller of the CPU and add some more
1088 NUMA awareness to the kernel.
1089
Ingo Molnarc280ea52008-11-08 13:29:45 +01001090 For 64-bit this is recommended if the system is Intel Core i7
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001091 (or later), AMD Opteron, or EM64T NUMA.
1092
1093 For 32-bit this is only needed on (rare) 32-bit-only platforms
1094 that support NUMA topologies, such as NUMAQ / Summit, or if you
1095 boot a 32-bit kernel on a 64-bit NUMA platform.
1096
1097 Otherwise, you should say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001098
1099comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
1100 depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
1101
1102config K8_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001103 def_bool y
1104 prompt "Old style AMD Opteron NUMA detection"
1105 depends on X86_64 && NUMA && PCI
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001106 ---help---
1107 Enable K8 NUMA node topology detection. You should say Y here if
1108 you have a multi processor AMD K8 system. This uses an old
1109 method to read the NUMA configuration directly from the builtin
1110 Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
1111 instead, which also takes priority if both are compiled in.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001112
1113config X86_64_ACPI_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001114 def_bool y
1115 prompt "ACPI NUMA detection"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001116 depends on X86_64 && NUMA && ACPI && PCI
1117 select ACPI_NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001118 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001119 Enable ACPI SRAT based node topology detection.
1120
Suresh Siddha6ec6e0d2008-03-25 10:14:35 -07001121# Some NUMA nodes have memory ranges that span
1122# other nodes. Even though a pfn is valid and
1123# between a node's start and end pfns, it may not
1124# reside on that node. See memmap_init_zone()
1125# for details.
1126config NODES_SPAN_OTHER_NODES
1127 def_bool y
1128 depends on X86_64_ACPI_NUMA
1129
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001130config NUMA_EMU
1131 bool "NUMA emulation"
1132 depends on X86_64 && NUMA
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001133 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001134 Enable NUMA emulation. A flat machine will be split
1135 into virtual nodes when booted with "numa=fake=N", where N is the
1136 number of nodes. This is only useful for debugging.
1137
1138config NODES_SHIFT
Linus Torvaldsd25e26b2008-08-25 14:15:38 -07001139 int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
Jan Beulich46d50c92009-03-12 12:33:06 +00001140 range 1 9
Linus Torvaldsd25e26b2008-08-25 14:15:38 -07001141 default "9" if MAXSMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001142 default "6" if X86_64
1143 default "4" if X86_NUMAQ
1144 default "3"
1145 depends on NEED_MULTIPLE_NODES
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001146 ---help---
Mike Travis1184dc22008-05-12 21:21:12 +02001147 Specify the maximum number of NUMA Nodes available on the target
Matt LaPlante692105b2009-01-26 11:12:25 +01001148 system. Increases memory reserved to accommodate various tables.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001149
Tejun Heoc1329372009-02-24 11:57:20 +09001150config HAVE_ARCH_BOOTMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001151 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001152 depends on X86_32 && NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001153
1154config ARCH_HAVE_MEMORY_PRESENT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001155 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001156 depends on X86_32 && DISCONTIGMEM
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001157
1158config NEED_NODE_MEMMAP_SIZE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001159 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001160 depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001161
1162config HAVE_ARCH_ALLOC_REMAP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001163 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001164 depends on X86_32 && NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001165
1166config ARCH_FLATMEM_ENABLE
1167 def_bool y
Jeff Chua99809962008-08-06 19:09:53 +08001168 depends on X86_32 && ARCH_SELECT_MEMORY_MODEL && !NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001169
1170config ARCH_DISCONTIGMEM_ENABLE
1171 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001172 depends on NUMA && X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001173
1174config ARCH_DISCONTIGMEM_DEFAULT
1175 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001176 depends on NUMA && X86_32
1177
1178config ARCH_SPARSEMEM_DEFAULT
1179 def_bool y
1180 depends on X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001181
1182config ARCH_SPARSEMEM_ENABLE
1183 def_bool y
Yinghai Lu4272ebf2009-01-29 15:14:46 -08001184 depends on X86_64 || NUMA || (EXPERIMENTAL && X86_32) || X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001185 select SPARSEMEM_STATIC if X86_32
1186 select SPARSEMEM_VMEMMAP_ENABLE if X86_64
1187
1188config ARCH_SELECT_MEMORY_MODEL
1189 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001190 depends on ARCH_SPARSEMEM_ENABLE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001191
1192config ARCH_MEMORY_PROBE
1193 def_bool X86_64
1194 depends on MEMORY_HOTPLUG
1195
1196source "mm/Kconfig"
1197
1198config HIGHPTE
1199 bool "Allocate 3rd-level pagetables from highmem"
1200 depends on X86_32 && (HIGHMEM4G || HIGHMEM64G)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001201 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001202 The VM uses one page table entry for each page of physical memory.
1203 For systems with a lot of RAM, this can be wasteful of precious
1204 low memory. Setting this option will put user-space page table
1205 entries in high memory.
1206
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001207config X86_CHECK_BIOS_CORRUPTION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001208 bool "Check for low memory corruption"
1209 ---help---
1210 Periodically check for memory corruption in low memory, which
1211 is suspected to be caused by BIOS. Even when enabled in the
1212 configuration, it is disabled at runtime. Enable it by
1213 setting "memory_corruption_check=1" on the kernel command
1214 line. By default it scans the low 64k of memory every 60
1215 seconds; see the memory_corruption_check_size and
1216 memory_corruption_check_period parameters in
1217 Documentation/kernel-parameters.txt to adjust this.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001218
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001219 When enabled with the default parameters, this option has
1220 almost no overhead, as it reserves a relatively small amount
1221 of memory and scans it infrequently. It both detects corruption
1222 and prevents it from affecting the running system.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001223
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001224 It is, however, intended as a diagnostic tool; if repeatable
1225 BIOS-originated corruption always affects the same memory,
1226 you can use memmap= to prevent the kernel from using that
1227 memory.
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001228
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001229config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001230 bool "Set the default setting of memory_corruption_check"
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001231 depends on X86_CHECK_BIOS_CORRUPTION
1232 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001233 ---help---
1234 Set whether the default state of memory_corruption_check is
1235 on or off.
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001236
Ingo Molnarfc381512008-09-16 10:07:34 +02001237config X86_RESERVE_LOW_64K
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001238 bool "Reserve low 64K of RAM on AMI/Phoenix BIOSen"
Ingo Molnarfc381512008-09-16 10:07:34 +02001239 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001240 ---help---
1241 Reserve the first 64K of physical RAM on BIOSes that are known
1242 to potentially corrupt that memory range. A numbers of BIOSes are
1243 known to utilize this area during suspend/resume, so it must not
1244 be used by the kernel.
Ingo Molnarfc381512008-09-16 10:07:34 +02001245
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001246 Set this to N if you are absolutely sure that you trust the BIOS
1247 to get all its memory reservations and usages right.
Ingo Molnarfc381512008-09-16 10:07:34 +02001248
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001249 If you have doubts about the BIOS (e.g. suspend/resume does not
1250 work or there's kernel crashes after certain hardware hotplug
1251 events) and it's not AMI or Phoenix, then you might want to enable
1252 X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check typical
1253 corruption patterns.
Ingo Molnarfc381512008-09-16 10:07:34 +02001254
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001255 Say Y if unsure.
Ingo Molnarfc381512008-09-16 10:07:34 +02001256
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001257config MATH_EMULATION
1258 bool
1259 prompt "Math emulation" if X86_32
1260 ---help---
1261 Linux can emulate a math coprocessor (used for floating point
1262 operations) if you don't have one. 486DX and Pentium processors have
1263 a math coprocessor built in, 486SX and 386 do not, unless you added
1264 a 487DX or 387, respectively. (The messages during boot time can
1265 give you some hints here ["man dmesg"].) Everyone needs either a
1266 coprocessor or this emulation.
1267
1268 If you don't have a math coprocessor, you need to say Y here; if you
1269 say Y here even though you have a coprocessor, the coprocessor will
1270 be used nevertheless. (This behavior can be changed with the kernel
1271 command line option "no387", which comes handy if your coprocessor
1272 is broken. Try "man bootparam" or see the documentation of your boot
1273 loader (lilo or loadlin) about how to pass options to the kernel at
1274 boot time.) This means that it is a good idea to say Y here if you
1275 intend to use this kernel on different machines.
1276
1277 More information about the internals of the Linux math coprocessor
1278 emulation can be found in <file:arch/x86/math-emu/README>.
1279
1280 If you are not sure, say Y; apart from resulting in a 66 KB bigger
1281 kernel, it won't hurt.
1282
1283config MTRR
1284 bool "MTRR (Memory Type Range Register) support"
1285 ---help---
1286 On Intel P6 family processors (Pentium Pro, Pentium II and later)
1287 the Memory Type Range Registers (MTRRs) may be used to control
1288 processor access to memory ranges. This is most useful if you have
1289 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
1290 allows bus write transfers to be combined into a larger transfer
1291 before bursting over the PCI/AGP bus. This can increase performance
1292 of image write operations 2.5 times or more. Saying Y here creates a
1293 /proc/mtrr file which may be used to manipulate your processor's
1294 MTRRs. Typically the X server should use this.
1295
1296 This code has a reasonably generic interface so that similar
1297 control registers on other processors can be easily supported
1298 as well:
1299
1300 The Cyrix 6x86, 6x86MX and M II processors have Address Range
1301 Registers (ARRs) which provide a similar functionality to MTRRs. For
1302 these, the ARRs are used to emulate the MTRRs.
1303 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
1304 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
1305 write-combining. All of these processors are supported by this code
1306 and it makes sense to say Y here if you have one of them.
1307
1308 Saying Y here also fixes a problem with buggy SMP BIOSes which only
1309 set the MTRRs for the boot CPU and not for the secondary CPUs. This
1310 can lead to all sorts of problems, so it's good to say Y here.
1311
1312 You can safely say Y even if your machine doesn't have MTRRs, you'll
1313 just add about 9 KB to your kernel.
1314
Randy Dunlap7225e752008-07-26 17:54:22 -07001315 See <file:Documentation/x86/mtrr.txt> for more information.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001316
Yinghai Lu95ffa242008-04-29 03:52:33 -07001317config MTRR_SANITIZER
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001318 def_bool y
Yinghai Lu95ffa242008-04-29 03:52:33 -07001319 prompt "MTRR cleanup support"
1320 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001321 ---help---
Thomas Gleixneraba37282008-07-15 14:48:48 +02001322 Convert MTRR layout from continuous to discrete, so X drivers can
1323 add writeback entries.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001324
Thomas Gleixneraba37282008-07-15 14:48:48 +02001325 Can be disabled with disable_mtrr_cleanup on the kernel command line.
Matt LaPlante692105b2009-01-26 11:12:25 +01001326 The largest mtrr entry size for a continuous block can be set with
Thomas Gleixneraba37282008-07-15 14:48:48 +02001327 mtrr_chunk_size.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001328
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001329 If unsure, say Y.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001330
1331config MTRR_SANITIZER_ENABLE_DEFAULT
Yinghai Luf5098d62008-04-29 20:25:58 -07001332 int "MTRR cleanup enable value (0-1)"
1333 range 0 1
1334 default "0"
Yinghai Lu95ffa242008-04-29 03:52:33 -07001335 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001336 ---help---
Yinghai Luf5098d62008-04-29 20:25:58 -07001337 Enable mtrr cleanup default value
Yinghai Lu95ffa242008-04-29 03:52:33 -07001338
Yinghai Lu12031a62008-05-02 02:40:22 -07001339config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
1340 int "MTRR cleanup spare reg num (0-7)"
1341 range 0 7
1342 default "1"
1343 depends on MTRR_SANITIZER
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001344 ---help---
Yinghai Lu12031a62008-05-02 02:40:22 -07001345 mtrr cleanup spare entries default, it can be changed via
Thomas Gleixneraba37282008-07-15 14:48:48 +02001346 mtrr_spare_reg_nr=N on the kernel command line.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001347
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001348config X86_PAT
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001349 bool
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001350 prompt "x86 PAT support"
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001351 depends on MTRR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001352 ---help---
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001353 Use PAT attributes to setup page level cache control.
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001354
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001355 PATs are the modern equivalents of MTRRs and are much more
1356 flexible than MTRRs.
1357
1358 Say N here if you see bootup problems (boot crash, boot hang,
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001359 spontaneous reboots) or a non-working video driver.
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001360
1361 If unsure, say Y.
1362
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001363config EFI
Jan Beulich9ba16082008-10-15 22:01:38 -07001364 bool "EFI runtime service support"
Huang, Ying5b836832008-01-30 13:31:19 +01001365 depends on ACPI
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001366 ---help---
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001367 This enables the kernel to use EFI runtime services that are
1368 available (such as the EFI variable services).
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001369
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001370 This option is only useful on systems that have EFI firmware.
1371 In addition, you should use the latest ELILO loader available
1372 at <http://elilo.sourceforge.net> in order to take advantage
1373 of EFI runtime services. However, even with this option, the
1374 resultant kernel should continue to boot on existing non-EFI
1375 platforms.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001376
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001377config SECCOMP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001378 def_bool y
1379 prompt "Enable seccomp to safely compute untrusted bytecode"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001380 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001381 This kernel feature is useful for number crunching applications
1382 that may need to compute untrusted bytecode during their
1383 execution. By using pipes or other transports made available to
1384 the process as file descriptors supporting the read/write
1385 syscalls, it's possible to isolate those applications in
1386 their own address space using seccomp. Once seccomp is
Alexey Dobriyan9c0bbee2008-09-09 11:01:31 +04001387 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001388 and the task is only allowed to execute a few safe syscalls
1389 defined by each seccomp mode.
1390
1391 If unsure, say Y. Only embedded should say N here.
1392
Ingo Molnar113c5412008-02-14 10:36:03 +01001393config CC_STACKPROTECTOR_ALL
1394 bool
1395
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001396config CC_STACKPROTECTOR
1397 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
Ingo Molnar113c5412008-02-14 10:36:03 +01001398 select CC_STACKPROTECTOR_ALL
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001399 ---help---
1400 This option turns on the -fstack-protector GCC feature. This
Ingo Molnar113c5412008-02-14 10:36:03 +01001401 feature puts, at the beginning of functions, a canary value on
1402 the stack just before the return address, and validates
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001403 the value just before actually returning. Stack based buffer
1404 overflows (that need to overwrite this return address) now also
1405 overwrite the canary, which gets detected and the attack is then
1406 neutralized via a kernel panic.
1407
1408 This feature requires gcc version 4.2 or above, or a distribution
1409 gcc with the feature backported. Older versions are automatically
Ingo Molnar113c5412008-02-14 10:36:03 +01001410 detected and for those versions, this configuration option is
1411 ignored. (and a warning is printed during bootup)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001412
1413source kernel/Kconfig.hz
1414
1415config KEXEC
1416 bool "kexec system call"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001417 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001418 kexec is a system call that implements the ability to shutdown your
1419 current kernel, and to start another kernel. It is like a reboot
1420 but it is independent of the system firmware. And like a reboot
1421 you can start any kernel with it, not just Linux.
1422
1423 The name comes from the similarity to the exec system call.
1424
1425 It is an ongoing process to be certain the hardware in a machine
1426 is properly shutdown, so do not be surprised if this code does not
1427 initially work for you. It may help to enable device hotplugging
1428 support. As of this writing the exact hardware interface is
1429 strongly in flux, so no good recommendation can be made.
1430
1431config CRASH_DUMP
Pavel Machek04b69442008-08-14 17:16:50 +02001432 bool "kernel crash dumps"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001433 depends on X86_64 || (X86_32 && HIGHMEM)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001434 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001435 Generate crash dump after being started by kexec.
1436 This should be normally only set in special crash dump kernels
1437 which are loaded in the main kernel with kexec-tools into
1438 a specially reserved region and then later executed after
1439 a crash by kdump/kexec. The crash dump kernel must be compiled
1440 to a memory address not used by the main kernel or BIOS using
1441 PHYSICAL_START, or it must be built as a relocatable image
1442 (CONFIG_RELOCATABLE=y).
1443 For more details see Documentation/kdump/kdump.txt
1444
Huang Ying3ab83522008-07-25 19:45:07 -07001445config KEXEC_JUMP
1446 bool "kexec jump (EXPERIMENTAL)"
1447 depends on EXPERIMENTAL
Huang Yingfee7b0d2009-03-10 10:57:16 +08001448 depends on KEXEC && HIBERNATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001449 ---help---
Huang Ying89081d12008-07-25 19:45:10 -07001450 Jump between original kernel and kexeced kernel and invoke
1451 code in physical address mode via KEXEC
Huang Ying3ab83522008-07-25 19:45:07 -07001452
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001453config PHYSICAL_START
1454 hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
1455 default "0x1000000" if X86_NUMAQ
1456 default "0x200000" if X86_64
1457 default "0x100000"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001458 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001459 This gives the physical address where the kernel is loaded.
1460
1461 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
1462 bzImage will decompress itself to above physical address and
1463 run from there. Otherwise, bzImage will run from the address where
1464 it has been loaded by the boot loader and will ignore above physical
1465 address.
1466
1467 In normal kdump cases one does not have to set/change this option
1468 as now bzImage can be compiled as a completely relocatable image
1469 (CONFIG_RELOCATABLE=y) and be used to load and run from a different
1470 address. This option is mainly useful for the folks who don't want
1471 to use a bzImage for capturing the crash dump and want to use a
1472 vmlinux instead. vmlinux is not relocatable hence a kernel needs
1473 to be specifically compiled to run from a specific memory area
1474 (normally a reserved region) and this option comes handy.
1475
1476 So if you are using bzImage for capturing the crash dump, leave
1477 the value here unchanged to 0x100000 and set CONFIG_RELOCATABLE=y.
1478 Otherwise if you plan to use vmlinux for capturing the crash dump
1479 change this value to start of the reserved region (Typically 16MB
1480 0x1000000). In other words, it can be set based on the "X" value as
1481 specified in the "crashkernel=YM@XM" command line boot parameter
1482 passed to the panic-ed kernel. Typically this parameter is set as
1483 crashkernel=64M@16M. Please take a look at
1484 Documentation/kdump/kdump.txt for more details about crash dumps.
1485
1486 Usage of bzImage for capturing the crash dump is recommended as
1487 one does not have to build two kernels. Same kernel can be used
1488 as production kernel and capture kernel. Above option should have
1489 gone away after relocatable bzImage support is introduced. But it
1490 is present because there are users out there who continue to use
1491 vmlinux for dump capture. This option should go away down the
1492 line.
1493
1494 Don't change this unless you know what you are doing.
1495
1496config RELOCATABLE
1497 bool "Build a relocatable kernel (EXPERIMENTAL)"
1498 depends on EXPERIMENTAL
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001499 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001500 This builds a kernel image that retains relocation information
1501 so it can be loaded someplace besides the default 1MB.
1502 The relocations tend to make the kernel binary about 10% larger,
1503 but are discarded at runtime.
1504
1505 One use is for the kexec on panic case where the recovery kernel
1506 must live at a different physical address than the primary
1507 kernel.
1508
1509 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
1510 it has been loaded at and the compile time physical address
1511 (CONFIG_PHYSICAL_START) is ignored.
1512
1513config PHYSICAL_ALIGN
1514 hex
1515 prompt "Alignment value to which kernel should be aligned" if X86_32
1516 default "0x100000" if X86_32
1517 default "0x200000" if X86_64
1518 range 0x2000 0x400000
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001519 ---help---
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001520 This value puts the alignment restrictions on physical address
1521 where kernel is loaded and run from. Kernel is compiled for an
1522 address which meets above alignment restriction.
1523
1524 If bootloader loads the kernel at a non-aligned address and
1525 CONFIG_RELOCATABLE is set, kernel will move itself to nearest
1526 address aligned to above value and run from there.
1527
1528 If bootloader loads the kernel at a non-aligned address and
1529 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
1530 load address and decompress itself to the address it has been
1531 compiled for and run from there. The address for which kernel is
1532 compiled already meets above alignment restrictions. Hence the
1533 end result is that kernel runs from a physical address meeting
1534 above alignment restrictions.
1535
1536 Don't change this unless you know what you are doing.
1537
1538config HOTPLUG_CPU
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001539 bool "Support for hot-pluggable CPUs"
Ingo Molnar4b19ed912009-01-27 17:47:24 +01001540 depends on SMP && HOTPLUG
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001541 ---help---
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001542 Say Y here to allow turning CPUs off and on. CPUs can be
1543 controlled through /sys/devices/system/cpu.
1544 ( Note: power management support will enable this option
1545 automatically on SMP systems. )
1546 Say N if you want to disable CPU hotplug.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001547
1548config COMPAT_VDSO
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001549 def_bool y
1550 prompt "Compat VDSO support"
Roland McGrathaf65d642008-01-30 13:30:43 +01001551 depends on X86_32 || IA32_EMULATION
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001552 ---help---
Roland McGrathaf65d642008-01-30 13:30:43 +01001553 Map the 32-bit VDSO to the predictable old-style address too.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001554 ---help---
1555 Say N here if you are running a sufficiently recent glibc
1556 version (2.3.3 or later), to remove the high-mapped
1557 VDSO mapping and to exclusively use the randomized VDSO.
1558
1559 If unsure, say Y.
1560
Tim Bird516cbf32008-08-12 12:52:36 -07001561config CMDLINE_BOOL
1562 bool "Built-in kernel command line"
1563 default n
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001564 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001565 Allow for specifying boot arguments to the kernel at
1566 build time. On some systems (e.g. embedded ones), it is
1567 necessary or convenient to provide some or all of the
1568 kernel boot arguments with the kernel itself (that is,
1569 to not rely on the boot loader to provide them.)
1570
1571 To compile command line arguments into the kernel,
1572 set this option to 'Y', then fill in the
1573 the boot arguments in CONFIG_CMDLINE.
1574
1575 Systems with fully functional boot loaders (i.e. non-embedded)
1576 should leave this option set to 'N'.
1577
1578config CMDLINE
1579 string "Built-in kernel command string"
1580 depends on CMDLINE_BOOL
1581 default ""
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001582 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001583 Enter arguments here that should be compiled into the kernel
1584 image and used at boot time. If the boot loader provides a
1585 command line at boot time, it is appended to this string to
1586 form the full kernel command line, when the system boots.
1587
1588 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
1589 change this behavior.
1590
1591 In most cases, the command line (whether built-in or provided
1592 by the boot loader) should specify the device for the root
1593 file system.
1594
1595config CMDLINE_OVERRIDE
1596 bool "Built-in command line overrides boot loader arguments"
1597 default n
1598 depends on CMDLINE_BOOL
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001599 ---help---
Tim Bird516cbf32008-08-12 12:52:36 -07001600 Set this option to 'Y' to have the kernel ignore the boot loader
1601 command line, and use ONLY the built-in command line.
1602
1603 This is used to work around broken boot loaders. This should
1604 be set to 'N' under normal conditions.
1605
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001606endmenu
1607
1608config ARCH_ENABLE_MEMORY_HOTPLUG
1609 def_bool y
1610 depends on X86_64 || (X86_32 && HIGHMEM)
1611
Gary Hade35551052008-10-31 10:52:03 -07001612config ARCH_ENABLE_MEMORY_HOTREMOVE
1613 def_bool y
1614 depends on MEMORY_HOTPLUG
1615
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001616config HAVE_ARCH_EARLY_PFN_TO_NID
1617 def_bool X86_64
1618 depends on NUMA
1619
Bjorn Helgaasda85f862008-11-05 13:37:27 -06001620menu "Power management and ACPI options"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001621
1622config ARCH_HIBERNATION_HEADER
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001623 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001624 depends on X86_64 && HIBERNATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001625
1626source "kernel/power/Kconfig"
1627
1628source "drivers/acpi/Kconfig"
1629
Andi Kleena6b68072008-01-30 13:32:49 +01001630config X86_APM_BOOT
1631 bool
1632 default y
1633 depends on APM || APM_MODULE
1634
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001635menuconfig APM
1636 tristate "APM (Advanced Power Management) BIOS support"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001637 depends on X86_32 && PM_SLEEP
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001638 ---help---
1639 APM is a BIOS specification for saving power using several different
1640 techniques. This is mostly useful for battery powered laptops with
1641 APM compliant BIOSes. If you say Y here, the system time will be
1642 reset after a RESUME operation, the /proc/apm device will provide
1643 battery status information, and user-space programs will receive
1644 notification of APM "events" (e.g. battery status change).
1645
1646 If you select "Y" here, you can disable actual use of the APM
1647 BIOS by passing the "apm=off" option to the kernel at boot time.
1648
1649 Note that the APM support is almost completely disabled for
1650 machines with more than one CPU.
1651
1652 In order to use APM, you will need supporting software. For location
Randy Dunlap53471122008-03-12 18:10:51 -04001653 and more information, read <file:Documentation/power/pm.txt> and the
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001654 Battery Powered Linux mini-HOWTO, available from
1655 <http://www.tldp.org/docs.html#howto>.
1656
1657 This driver does not spin down disk drives (see the hdparm(8)
1658 manpage ("man 8 hdparm") for that), and it doesn't turn off
1659 VESA-compliant "green" monitors.
1660
1661 This driver does not support the TI 4000M TravelMate and the ACER
1662 486/DX4/75 because they don't have compliant BIOSes. Many "green"
1663 desktop machines also don't have compliant BIOSes, and this driver
1664 may cause those machines to panic during the boot phase.
1665
1666 Generally, if you don't have a battery in your machine, there isn't
1667 much point in using this driver and you should say N. If you get
1668 random kernel OOPSes or reboots that don't seem to be related to
1669 anything, try disabling/enabling this option (or disabling/enabling
1670 APM in your BIOS).
1671
1672 Some other things you should try when experiencing seemingly random,
1673 "weird" problems:
1674
1675 1) make sure that you have enough swap space and that it is
1676 enabled.
1677 2) pass the "no-hlt" option to the kernel
1678 3) switch on floating point emulation in the kernel and pass
1679 the "no387" option to the kernel
1680 4) pass the "floppy=nodma" option to the kernel
1681 5) pass the "mem=4M" option to the kernel (thereby disabling
1682 all but the first 4 MB of RAM)
1683 6) make sure that the CPU is not over clocked.
1684 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
1685 8) disable the cache from your BIOS settings
1686 9) install a fan for the video card or exchange video RAM
1687 10) install a better fan for the CPU
1688 11) exchange RAM chips
1689 12) exchange the motherboard.
1690
1691 To compile this driver as a module, choose M here: the
1692 module will be called apm.
1693
1694if APM
1695
1696config APM_IGNORE_USER_SUSPEND
1697 bool "Ignore USER SUSPEND"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001698 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001699 This option will ignore USER SUSPEND requests. On machines with a
1700 compliant APM BIOS, you want to say N. However, on the NEC Versa M
1701 series notebooks, it is necessary to say Y because of a BIOS bug.
1702
1703config APM_DO_ENABLE
1704 bool "Enable PM at boot time"
1705 ---help---
1706 Enable APM features at boot time. From page 36 of the APM BIOS
1707 specification: "When disabled, the APM BIOS does not automatically
1708 power manage devices, enter the Standby State, enter the Suspend
1709 State, or take power saving steps in response to CPU Idle calls."
1710 This driver will make CPU Idle calls when Linux is idle (unless this
1711 feature is turned off -- see "Do CPU IDLE calls", below). This
1712 should always save battery power, but more complicated APM features
1713 will be dependent on your BIOS implementation. You may need to turn
1714 this option off if your computer hangs at boot time when using APM
1715 support, or if it beeps continuously instead of suspending. Turn
1716 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
1717 T400CDT. This is off by default since most machines do fine without
1718 this feature.
1719
1720config APM_CPU_IDLE
1721 bool "Make CPU Idle calls when idle"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001722 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001723 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
1724 On some machines, this can activate improved power savings, such as
1725 a slowed CPU clock rate, when the machine is idle. These idle calls
1726 are made after the idle loop has run for some length of time (e.g.,
1727 333 mS). On some machines, this will cause a hang at boot time or
1728 whenever the CPU becomes idle. (On machines with more than one CPU,
1729 this option does nothing.)
1730
1731config APM_DISPLAY_BLANK
1732 bool "Enable console blanking using APM"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001733 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001734 Enable console blanking using the APM. Some laptops can use this to
1735 turn off the LCD backlight when the screen blanker of the Linux
1736 virtual console blanks the screen. Note that this is only used by
1737 the virtual console screen blanker, and won't turn off the backlight
1738 when using the X Window system. This also doesn't have anything to
1739 do with your VESA-compliant power-saving monitor. Further, this
1740 option doesn't work for all laptops -- it might not turn off your
1741 backlight at all, or it might print a lot of errors to the console,
1742 especially if you are using gpm.
1743
1744config APM_ALLOW_INTS
1745 bool "Allow interrupts during APM BIOS calls"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001746 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001747 Normally we disable external interrupts while we are making calls to
1748 the APM BIOS as a measure to lessen the effects of a badly behaving
1749 BIOS implementation. The BIOS should reenable interrupts if it
1750 needs to. Unfortunately, some BIOSes do not -- especially those in
1751 many of the newer IBM Thinkpads. If you experience hangs when you
1752 suspend, try setting this to Y. Otherwise, say N.
1753
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001754endif # APM
1755
1756source "arch/x86/kernel/cpu/cpufreq/Kconfig"
1757
1758source "drivers/cpuidle/Kconfig"
1759
Andy Henroid27471fd2008-10-09 11:45:22 -07001760source "drivers/idle/Kconfig"
1761
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001762endmenu
1763
1764
1765menu "Bus options (PCI etc.)"
1766
1767config PCI
Ingo Molnar1ac97012008-05-19 14:10:14 +02001768 bool "PCI support"
Adrian Bunk1c858082008-01-30 13:32:32 +01001769 default y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001770 select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001771 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001772 Find out whether you have a PCI motherboard. PCI is the name of a
1773 bus system, i.e. the way the CPU talks to the other stuff inside
1774 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1775 VESA. If you have PCI, say Y, otherwise N.
1776
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001777choice
1778 prompt "PCI access mode"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001779 depends on X86_32 && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001780 default PCI_GOANY
1781 ---help---
1782 On PCI systems, the BIOS can be used to detect the PCI devices and
1783 determine their configuration. However, some old PCI motherboards
1784 have BIOS bugs and may crash if this is done. Also, some embedded
1785 PCI-based systems don't have any BIOS at all. Linux can also try to
1786 detect the PCI hardware directly without using the BIOS.
1787
1788 With this option, you can specify how Linux should detect the
1789 PCI devices. If you choose "BIOS", the BIOS will be used,
1790 if you choose "Direct", the BIOS won't be used, and if you
1791 choose "MMConfig", then PCI Express MMCONFIG will be used.
1792 If you choose "Any", the kernel will try MMCONFIG, then the
1793 direct access method and falls back to the BIOS if that doesn't
1794 work. If unsure, go with the default, which is "Any".
1795
1796config PCI_GOBIOS
1797 bool "BIOS"
1798
1799config PCI_GOMMCONFIG
1800 bool "MMConfig"
1801
1802config PCI_GODIRECT
1803 bool "Direct"
1804
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001805config PCI_GOOLPC
1806 bool "OLPC"
1807 depends on OLPC
1808
Andres Salomon2bdd1b02008-06-05 14:14:41 -07001809config PCI_GOANY
1810 bool "Any"
1811
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001812endchoice
1813
1814config PCI_BIOS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001815 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001816 depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001817
1818# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
1819config PCI_DIRECT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001820 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001821 depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001822
1823config PCI_MMCONFIG
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001824 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001825 depends on X86_32 && PCI && ACPI && (PCI_GOMMCONFIG || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001826
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001827config PCI_OLPC
Andres Salomon2bdd1b02008-06-05 14:14:41 -07001828 def_bool y
1829 depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001830
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001831config PCI_DOMAINS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001832 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001833 depends on PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001834
1835config PCI_MMCONFIG
1836 bool "Support mmconfig PCI config space access"
1837 depends on X86_64 && PCI && ACPI
1838
1839config DMAR
1840 bool "Support for DMA Remapping Devices (EXPERIMENTAL)"
David Woodhouse4cf2e752009-02-11 17:23:43 +00001841 depends on PCI_MSI && ACPI && EXPERIMENTAL
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001842 help
1843 DMA remapping (DMAR) devices support enables independent address
1844 translations for Direct Memory Access (DMA) from devices.
1845 These DMA remapping devices are reported via ACPI tables
1846 and include PCI device scope covered by these DMA
1847 remapping devices.
1848
Kyle McMartin0cd5c3c2009-02-04 14:29:19 -08001849config DMAR_DEFAULT_ON
Kyle McMartinf6be37f2009-02-26 12:57:56 -05001850 def_bool y
Kyle McMartin0cd5c3c2009-02-04 14:29:19 -08001851 prompt "Enable DMA Remapping Devices by default"
1852 depends on DMAR
1853 help
1854 Selecting this option will enable a DMAR device at boot time if
1855 one is found. If this option is not selected, DMAR support can
1856 be enabled by passing intel_iommu=on to the kernel. It is
1857 recommended you say N here while the DMAR code remains
1858 experimental.
1859
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001860config DMAR_GFX_WA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001861 def_bool y
1862 prompt "Support for Graphics workaround"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001863 depends on DMAR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001864 ---help---
1865 Current Graphics drivers tend to use physical address
1866 for DMA and avoid using DMA APIs. Setting this config
1867 option permits the IOMMU driver to set a unity map for
1868 all the OS-visible memory. Hence the driver can continue
1869 to use physical addresses for DMA.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001870
1871config DMAR_FLOPPY_WA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001872 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001873 depends on DMAR
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001874 ---help---
1875 Floppy disk drivers are know to bypass DMA API calls
1876 thereby failing to work when IOMMU is enabled. This
1877 workaround will setup a 1:1 mapping for the first
1878 16M to make floppy (an ISA device) work.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001879
Suresh Siddha9fa8c482008-07-10 11:17:00 -07001880config INTR_REMAP
1881 bool "Support for Interrupt Remapping (EXPERIMENTAL)"
1882 depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI && EXPERIMENTAL
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001883 ---help---
1884 Supports Interrupt remapping for IO-APIC and MSI devices.
1885 To use x2apic mode in the CPU's which support x2APIC enhancements or
1886 to support platforms with CPU's having > 8 bit APIC ID, say Y.
Suresh Siddha9fa8c482008-07-10 11:17:00 -07001887
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001888source "drivers/pci/pcie/Kconfig"
1889
1890source "drivers/pci/Kconfig"
1891
1892# x86_64 have no ISA slots, but do have ISA-style DMA.
1893config ISA_DMA_API
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001894 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001895
1896if X86_32
1897
1898config ISA
1899 bool "ISA support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001900 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001901 Find out whether you have ISA slots on your motherboard. ISA is the
1902 name of a bus system, i.e. the way the CPU talks to the other stuff
1903 inside your box. Other bus systems are PCI, EISA, MicroChannel
1904 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1905 newer boards don't support it. If you have ISA, say Y, otherwise N.
1906
1907config EISA
1908 bool "EISA support"
1909 depends on ISA
1910 ---help---
1911 The Extended Industry Standard Architecture (EISA) bus was
1912 developed as an open alternative to the IBM MicroChannel bus.
1913
1914 The EISA bus provided some of the features of the IBM MicroChannel
1915 bus while maintaining backward compatibility with cards made for
1916 the older ISA bus. The EISA bus saw limited use between 1988 and
1917 1995 when it was made obsolete by the PCI bus.
1918
1919 Say Y here if you are building a kernel for an EISA-based machine.
1920
1921 Otherwise, say N.
1922
1923source "drivers/eisa/Kconfig"
1924
1925config MCA
Ingo Molnar72ee6eb2009-01-27 16:57:49 +01001926 bool "MCA support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001927 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001928 MicroChannel Architecture is found in some IBM PS/2 machines and
1929 laptops. It is a bus system similar to PCI or ISA. See
1930 <file:Documentation/mca.txt> (and especially the web page given
1931 there) before attempting to build an MCA bus kernel.
1932
1933source "drivers/mca/Kconfig"
1934
1935config SCx200
1936 tristate "NatSemi SCx200 support"
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001937 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001938 This provides basic support for National Semiconductor's
1939 (now AMD's) Geode processors. The driver probes for the
1940 PCI-IDs of several on-chip devices, so its a good dependency
1941 for other scx200_* drivers.
1942
1943 If compiled as a module, the driver is named scx200.
1944
1945config SCx200HR_TIMER
1946 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
1947 depends on SCx200 && GENERIC_TIME
1948 default y
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001949 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001950 This driver provides a clocksource built upon the on-chip
1951 27MHz high-resolution timer. Its also a workaround for
1952 NSC Geode SC-1100's buggy TSC, which loses time when the
1953 processor goes idle (as is done by the scheduler). The
1954 other workaround is idle=poll boot option.
1955
1956config GEODE_MFGPT_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001957 def_bool y
1958 prompt "Geode Multi-Function General Purpose Timer (MFGPT) events"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001959 depends on MGEODE_LX && GENERIC_TIME && GENERIC_CLOCKEVENTS
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001960 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001961 This driver provides a clock event source based on the MFGPT
1962 timer(s) in the CS5535 and CS5536 companion chip for the geode.
1963 MFGPTs have a better resolution and max interval than the
1964 generic PIT, and are suitable for use as high-res timers.
1965
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001966config OLPC
1967 bool "One Laptop Per Child support"
1968 default n
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001969 ---help---
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001970 Add support for detecting the unique features of the OLPC
1971 XO hardware.
1972
Sam Ravnborgbc0120f2007-11-06 23:10:39 +01001973endif # X86_32
1974
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001975config K8_NB
1976 def_bool y
Sam Ravnborgbc0120f2007-11-06 23:10:39 +01001977 depends on AGP_AMD64 || (X86_64 && (GART_IOMMU || (PCI && NUMA)))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001978
1979source "drivers/pcmcia/Kconfig"
1980
1981source "drivers/pci/hotplug/Kconfig"
1982
1983endmenu
1984
1985
1986menu "Executable file formats / Emulations"
1987
1988source "fs/Kconfig.binfmt"
1989
1990config IA32_EMULATION
1991 bool "IA32 Emulation"
1992 depends on X86_64
Roland McGratha97f52e2008-01-30 13:31:55 +01001993 select COMPAT_BINFMT_ELF
Ingo Molnar8f9ca472009-02-05 16:21:53 +01001994 ---help---
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001995 Include code to run 32-bit programs under a 64-bit kernel. You should
1996 likely turn this on, unless you're 100% sure that you don't have any
1997 32-bit programs left.
1998
1999config IA32_AOUT
Ingo Molnar8f9ca472009-02-05 16:21:53 +01002000 tristate "IA32 a.out support"
2001 depends on IA32_EMULATION
2002 ---help---
2003 Support old a.out binaries in the 32bit emulation.
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002004
2005config COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002006 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002007 depends on IA32_EMULATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002008
2009config COMPAT_FOR_U64_ALIGNMENT
2010 def_bool COMPAT
2011 depends on X86_64
2012
2013config SYSVIPC_COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01002014 def_bool y
Alexey Dobriyanb8992192008-09-14 13:44:41 +04002015 depends on COMPAT && SYSVIPC
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002016
2017endmenu
2018
2019
Keith Packarde5beae12008-11-03 18:21:45 +01002020config HAVE_ATOMIC_IOMAP
2021 def_bool y
2022 depends on X86_32
2023
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002024source "net/Kconfig"
2025
2026source "drivers/Kconfig"
2027
2028source "drivers/firmware/Kconfig"
2029
2030source "fs/Kconfig"
2031
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002032source "arch/x86/Kconfig.debug"
2033
2034source "security/Kconfig"
2035
2036source "crypto/Kconfig"
2037
Avi Kivityedf88412007-12-16 11:02:48 +02002038source "arch/x86/kvm/Kconfig"
2039
Sam Ravnborge279b6c2007-11-06 20:41:05 +01002040source "lib/Kconfig"