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Sam Ravnborg1032c0b2007-11-06 21:35:08 +01001# x86 configuration
Sam Ravnborgdaa93fa2007-11-12 20:54:30 +01002mainmenu "Linux Kernel Configuration for x86"
3
4# Select 32 or 64 bit
5config 64BIT
Sam Ravnborg68409992007-11-17 15:37:31 +01006 bool "64-bit kernel" if ARCH = "x86"
7 default ARCH = "x86_64"
Sam Ravnborgdaa93fa2007-11-12 20:54:30 +01008 help
9 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
Ingo Molnare0ec9482009-01-27 17:01:14 +010037 select HAVE_KVM
Ingo Molnar49793b02009-01-27 17:02:29 +010038 select HAVE_ARCH_KGDB
Roland McGrath99bbc4b2008-04-20 14:35:12 -070039 select HAVE_ARCH_TRACEHOOK
Dmitry Baryshkov323ec002008-06-29 14:19:31 +040040 select HAVE_GENERIC_DMA_COHERENT if X86_32
Johannes Berg58340a02008-07-25 01:45:33 -070041 select HAVE_EFFICIENT_UNALIGNED_ACCESS
Török Edwin8d264872008-11-23 12:39:08 +020042 select USER_STACKTRACE_SUPPORT
Balbir Singh7d8330a2008-02-10 12:46:28 +053043
Sam Ravnborg73531902008-05-25 23:03:18 +020044config ARCH_DEFCONFIG
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +020045 string
Sam Ravnborg73531902008-05-25 23:03:18 +020046 default "arch/x86/configs/i386_defconfig" if X86_32
47 default "arch/x86/configs/x86_64_defconfig" if X86_64
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +020048
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010049config GENERIC_TIME
Harvey Harrison3c2362e2008-01-30 13:31:03 +010050 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010051
52config GENERIC_CMOS_UPDATE
Harvey Harrison3c2362e2008-01-30 13:31:03 +010053 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010054
55config CLOCKSOURCE_WATCHDOG
Harvey Harrison3c2362e2008-01-30 13:31:03 +010056 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010057
58config GENERIC_CLOCKEVENTS
Harvey Harrison3c2362e2008-01-30 13:31:03 +010059 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010060
61config GENERIC_CLOCKEVENTS_BROADCAST
Harvey Harrison3c2362e2008-01-30 13:31:03 +010062 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010063 depends on X86_64 || (X86_32 && X86_LOCAL_APIC)
64
65config LOCKDEP_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +010066 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010067
68config STACKTRACE_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +010069 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010070
Heiko Carstensaa7d9352008-02-01 17:45:14 +010071config HAVE_LATENCYTOP_SUPPORT
72 def_bool y
73
Christoph Lameter1f842602008-01-07 23:20:30 -080074config FAST_CMPXCHG_LOCAL
75 bool
76 default y
77
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010078config MMU
Harvey Harrison3c2362e2008-01-30 13:31:03 +010079 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010080
81config ZONE_DMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +010082 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010083
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010084config SBUS
85 bool
86
87config GENERIC_ISA_DMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +010088 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010089
90config GENERIC_IOMAP
Harvey Harrison3c2362e2008-01-30 13:31:03 +010091 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010092
93config GENERIC_BUG
Harvey Harrison3c2362e2008-01-30 13:31:03 +010094 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010095 depends on BUG
Jan Beulichb93a5312008-12-16 11:40:27 +000096 select GENERIC_BUG_RELATIVE_POINTERS if X86_64
97
98config GENERIC_BUG_RELATIVE_POINTERS
99 bool
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100100
101config GENERIC_HWEIGHT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100102 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100103
Florian Fainellia6082952008-01-30 13:33:35 +0100104config GENERIC_GPIO
Jan Beulich9ba16082008-10-15 22:01:38 -0700105 bool
Florian Fainellia6082952008-01-30 13:33:35 +0100106
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100107config ARCH_MAY_HAVE_PC_FDC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100108 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100109
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100110config RWSEM_GENERIC_SPINLOCK
111 def_bool !X86_XADD
112
113config RWSEM_XCHGADD_ALGORITHM
114 def_bool X86_XADD
115
Venki Pallipadia6869cc2008-02-08 17:05:44 -0800116config ARCH_HAS_CPU_IDLE_WAIT
117 def_bool y
118
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100119config GENERIC_CALIBRATE_DELAY
120 def_bool y
121
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100122config GENERIC_TIME_VSYSCALL
123 bool
124 default X86_64
125
venkatesh.pallipadi@intel.com9a0b8412008-01-31 17:35:06 -0800126config ARCH_HAS_CPU_RELAX
127 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100128
Venkatesh Pallipadi89cedfe2008-10-16 19:00:08 -0400129config ARCH_HAS_DEFAULT_IDLE
130 def_bool y
131
Pekka Enberg1b27d052008-04-28 02:12:22 -0700132config ARCH_HAS_CACHE_LINE_SIZE
133 def_bool y
134
Mike Travisdd5af902008-01-30 13:33:32 +0100135config HAVE_SETUP_PER_CPU_AREA
Brian Gerst89c9c4c2009-01-27 12:56:48 +0900136 def_bool y
travis@sgi.comb32ef632008-01-30 13:32:51 +0100137
Mike Travis9f0e8d02008-04-04 18:11:01 -0700138config HAVE_CPUMASK_OF_CPU_MAP
139 def_bool X86_64_SMP
140
Johannes Berg801e4062007-12-08 02:12:39 +0100141config ARCH_HIBERNATION_POSSIBLE
142 def_bool y
Ingo Molnaraced3ce2009-01-27 17:03:24 +0100143 depends on !SMP
Johannes Berg801e4062007-12-08 02:12:39 +0100144
Johannes Bergf4cb5702007-12-08 02:14:00 +0100145config ARCH_SUSPEND_POSSIBLE
146 def_bool y
Johannes Bergf4cb5702007-12-08 02:14:00 +0100147
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100148config ZONE_DMA32
149 bool
150 default X86_64
151
152config ARCH_POPULATES_NODE_MAP
153 def_bool y
154
155config AUDIT_ARCH
156 bool
157 default X86_64
158
Ingo Molnar765c68b2008-04-09 11:03:37 +0200159config ARCH_SUPPORTS_OPTIMIZED_INLINING
160 def_bool y
161
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100162# Use the generic interrupt handling code in kernel/irq/:
163config GENERIC_HARDIRQS
164 bool
165 default y
166
167config GENERIC_IRQ_PROBE
168 bool
169 default y
170
171config GENERIC_PENDING_IRQ
172 bool
173 depends on GENERIC_HARDIRQS && SMP
174 default y
175
James Bottomley6cd10f82008-11-09 11:53:14 -0600176config USE_GENERIC_SMP_HELPERS
177 def_bool y
178 depends on SMP
179
Sam Ravnborg6b0c3d42008-01-30 13:32:27 +0100180config X86_32_SMP
181 def_bool y
182 depends on X86_32 && SMP
183
184config X86_64_SMP
185 def_bool y
186 depends on X86_64 && SMP
187
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100188config X86_HT
189 bool
Adrian Bunkee0011a2007-12-04 17:19:07 +0100190 depends on SMP
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100191 default y
192
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100193config X86_TRAMPOLINE
194 bool
Ingo Molnar3e5095d2009-01-27 17:07:08 +0100195 depends on SMP || (64BIT && ACPI_SLEEP)
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100196 default y
197
198config KTIME_SCALAR
199 def_bool X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100200source "init/Kconfig"
Matt Helsleydc52ddc2008-10-18 20:27:21 -0700201source "kernel/Kconfig.freezer"
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100202
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100203menu "Processor type and features"
204
205source "kernel/time/Kconfig"
206
207config SMP
208 bool "Symmetric multi-processing support"
209 ---help---
210 This enables support for systems with more than one CPU. If you have
211 a system with only one CPU, like most personal computers, say N. If
212 you have a system with more than one CPU, say Y.
213
214 If you say N here, the kernel will run on single and multiprocessor
215 machines, but will use only one CPU of a multiprocessor machine. If
216 you say Y here, the kernel will run on many, but not all,
217 singleprocessor machines. On a singleprocessor machine, the kernel
218 will run faster if you say N here.
219
220 Note that if you say Y here and choose architecture "586" or
221 "Pentium" under "Processor family", the kernel will not work on 486
222 architectures. Similarly, multiprocessor kernels for the "PPro"
223 architecture may not work on all Pentium based boards.
224
225 People using multiprocessor machines who say Y here should also say
226 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
227 Management" code will be disabled if you say Y here.
228
Adrian Bunk03502fa2008-02-03 15:50:21 +0200229 See also <file:Documentation/i386/IO-APIC.txt>,
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100230 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
231 <http://www.tldp.org/docs.html#howto>.
232
233 If you don't know what to do here, say N.
234
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800235config SPARSE_IRQ
236 bool "Support sparse irq numbering"
Yinghai Lu17483a12008-12-12 13:14:18 -0800237 depends on PCI_MSI || HT_IRQ
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800238 help
Ingo Molnar973656f2008-12-25 16:26:47 +0100239 This enables support for sparse irqs. This is useful for distro
240 kernels that want to define a high CONFIG_NR_CPUS value but still
241 want to have low kernel memory footprint on smaller machines.
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800242
Ingo Molnar973656f2008-12-25 16:26:47 +0100243 ( Sparse IRQs can also be beneficial on NUMA boxes, as they spread
244 out the irq_desc[] array in a more NUMA-friendly way. )
245
246 If you don't know what to do here, say N.
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800247
Yinghai Lu48a1b102008-12-11 00:15:01 -0800248config NUMA_MIGRATE_IRQ_DESC
249 bool "Move irq desc when changing irq smp_affinity"
Yinghai Lub9098952008-12-19 13:48:34 -0800250 depends on SPARSE_IRQ && NUMA
Yinghai Lu48a1b102008-12-11 00:15:01 -0800251 default n
252 help
253 This enables moving irq_desc to cpu/node that irq will use handled.
254
255 If you don't know what to do here, say N.
256
Yinghai Lu6695c852008-06-19 12:13:09 -0700257config X86_MPPARSE
Jan Beulich7a527682008-10-30 10:38:24 +0000258 bool "Enable MPS table" if ACPI
259 default y
Ingo Molnar5ab74722008-07-10 14:42:03 +0200260 depends on X86_LOCAL_APIC
Yinghai Lu6695c852008-06-19 12:13:09 -0700261 help
262 For old smp systems that do not have proper acpi support. Newer systems
263 (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
Yinghai Lu6695c852008-06-19 12:13:09 -0700264
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100265config X86_PC
Ingo Molnare2c75d92009-01-27 18:31:41 +0100266 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100267
Ingo Molnar06ac8342009-01-27 18:11:43 +0100268config X86_NON_STANDARD
269 bool "Support for non-standard x86 platforms"
270 help
271 If you disable this option then the kernel will only support
272 standard PC platforms. (which covers the vast majority of
273 systems out there.)
274
275 If you enable this option then you'll be able to select a number
276 of less common non-PC x86 platforms: VisWS, RDC321, SGI/UV.
277
278 If you have one of these systems, or if you want to build a
279 generic distribution kernel, say Y here - otherwise say N.
280
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200281config X86_VISWS
282 bool "SGI 320/540 (Visual Workstation)"
Ingo Molnar36619a82009-01-27 17:33:34 +0100283 depends on X86_32 && PCI && X86_MPPARSE && PCI_GODIRECT
Ingo Molnar06ac8342009-01-27 18:11:43 +0100284 depends on X86_NON_STANDARD
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200285 help
286 The SGI Visual Workstation series is an IA32-based workstation
287 based on SGI systems chips with some legacy PC hardware attached.
288
289 Say Y here to create a kernel to run on the SGI 320 or 540.
290
291 A kernel compiled for the Visual Workstation will run on general
292 PCs as well. See <file:Documentation/sgi-visws.txt> for details.
293
Ingo Molnar1f972762008-07-26 13:52:50 +0200294config X86_RDC321X
295 bool "RDC R-321x SoC"
296 depends on X86_32
Ingo Molnar06ac8342009-01-27 18:11:43 +0100297 depends on X86_NON_STANDARD
Ingo Molnar1f972762008-07-26 13:52:50 +0200298 select M486
299 select X86_REBOOTFIXUPS
300 help
301 This option is needed for RDC R-321x system-on-chip, also known
302 as R-8610-(G).
303 If you don't have one of these chips, you should say N here.
304
Nick Piggin03b48632009-01-20 04:36:04 +0100305config X86_UV
306 bool "SGI Ultraviolet"
307 depends on X86_64
Ingo Molnar06ac8342009-01-27 18:11:43 +0100308 depends on X86_NON_STANDARD
Nick Piggin03b48632009-01-20 04:36:04 +0100309 help
310 This option is needed in order to support SGI Ultraviolet systems.
311 If you don't have one of these, you should say N here.
312
Ingo Molnar6a485652009-01-27 18:29:13 +0100313config X86_VSMP
314 bool "Support for ScaleMP vSMP"
315 select PARAVIRT
316 depends on X86_64 && PCI
317 depends on X86_NON_STANDARD
318 help
319 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
320 supposed to run on these EM64T-based machines. Only choose this option
321 if you have one of these machines.
322
Ingo Molnar9e111f32009-01-27 18:18:25 +0100323config X86_ELAN
324 bool "AMD Elan"
325 depends on X86_32
326 depends on X86_NON_STANDARD
327 help
328 Select this for an AMD Elan processor.
329
330 Do not use this option for K6/Athlon/Opteron processors!
331
332 If unsure, choose "PC-compatible" instead.
333
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100334config X86_32_NON_STANDARD
Ingo Molnar9c398012009-01-27 18:24:57 +0100335 bool "Support non-standard 32-bit SMP architectures"
336 depends on X86_32 && SMP
337 depends on X86_NON_STANDARD
338 help
339 This option compiles in the NUMAQ, Summit, bigsmp, ES7000, default
340 subarchitectures. It is intended for a generic binary kernel.
341 if you select them all, kernel will probe it one by one. and will
342 fallback to default.
343
Ingo Molnar3769e7b2009-01-27 18:46:23 +0100344config X86_BIGSMP
345 bool "Support for big SMP systems with more than 8 CPUs"
346 depends on X86_32_NON_STANDARD
347 help
348 This option is needed for the systems that have more than 8 CPUs
349 and if the system is not of any sub-arch type above.
350
Ingo Molnar9c398012009-01-27 18:24:57 +0100351config X86_NUMAQ
352 bool "NUMAQ (IBM/Sequent)"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100353 depends on X86_32_NON_STANDARD
Ingo Molnar9c398012009-01-27 18:24:57 +0100354 select NUMA
355 select X86_MPPARSE
356 help
357 This option is used for getting Linux to run on a NUMAQ (IBM/Sequent)
358 NUMA multiquad box. This changes the way that processors are
359 bootstrapped, and uses Clustered Logical APIC addressing mode instead
360 of Flat Logical. You will need a new lynxer.elf file to flash your
361 firmware with - send email to <Martin.Bligh@us.ibm.com>.
362
363config X86_SUMMIT
364 bool "Summit/EXA (IBM x440)"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100365 depends on X86_32_NON_STANDARD
Ingo Molnar9c398012009-01-27 18:24:57 +0100366 help
367 This option is needed for IBM systems that use the Summit/EXA chipset.
368 In particular, it is needed for the x440.
369
370config X86_ES7000
371 bool "Support for Unisys ES7000 IA32 series"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100372 depends on X86_32_NON_STANDARD
Ingo Molnar9c398012009-01-27 18:24:57 +0100373 help
374 Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
375 supposed to run on an IA32-based Unisys ES7000 system.
376
Ingo Molnar3769e7b2009-01-27 18:46:23 +0100377config X86_VOYAGER
378 bool "Voyager (NCR)"
379 depends on SMP && !PCI && BROKEN
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100380 depends on X86_32_NON_STANDARD
Ingo Molnar9c398012009-01-27 18:24:57 +0100381 help
Ingo Molnar3769e7b2009-01-27 18:46:23 +0100382 Voyager is an MCA-based 32-way capable SMP architecture proprietary
383 to NCR Corp. Machine classes 345x/35xx/4100/51xx are Voyager-based.
384
385 *** WARNING ***
386
387 If you do not specifically know you have a Voyager based machine,
388 say N here, otherwise the kernel you build will not be bootable.
Ingo Molnar9c398012009-01-27 18:24:57 +0100389
Ingo Molnarae1e9132008-11-11 09:05:16 +0100390config SCHED_OMIT_FRAME_POINTER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100391 def_bool y
392 prompt "Single-depth WCHAN output"
Ken Chena87d0912008-11-06 11:10:49 -0800393 depends on X86
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100394 help
395 Calculate simpler /proc/<PID>/wchan values. If this option
396 is disabled then wchan values will recurse back to the
397 caller function. This provides more accurate wchan values,
398 at the expense of slightly more scheduling overhead.
399
400 If in doubt, say "Y".
401
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100402menuconfig PARAVIRT_GUEST
403 bool "Paravirtualized guest support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100404 help
405 Say Y here to get to see options related to running Linux under
406 various hypervisors. This option alone does not add any kernel code.
407
408 If you say N, all options in this submenu will be skipped and disabled.
409
410if PARAVIRT_GUEST
411
412source "arch/x86/xen/Kconfig"
413
414config VMI
415 bool "VMI Guest support"
416 select PARAVIRT
Eduardo Pereira Habkost42d545c2008-01-30 13:33:32 +0100417 depends on X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100418 help
419 VMI provides a paravirtualized interface to the VMware ESX server
420 (it could be used by other hypervisors in theory too, but is not
421 at the moment), by linking the kernel to a GPL-ed ROM module
422 provided by the hypervisor.
423
Glauber de Oliveira Costa790c73f2008-02-15 17:52:48 -0200424config KVM_CLOCK
425 bool "KVM paravirtualized clock"
426 select PARAVIRT
Gerd Hoffmannf6e16d52008-06-03 16:17:32 +0200427 select PARAVIRT_CLOCK
Glauber de Oliveira Costa790c73f2008-02-15 17:52:48 -0200428 help
429 Turning on this option will allow you to run a paravirtualized clock
430 when running over the KVM hypervisor. Instead of relying on a PIT
431 (or probably other) emulation by the underlying device model, the host
432 provides the guest with timing infrastructure such as time of day, and
433 system time
434
Marcelo Tosatti0cf1bfd2008-02-22 12:21:36 -0500435config KVM_GUEST
436 bool "KVM Guest support"
437 select PARAVIRT
Marcelo Tosatti0cf1bfd2008-02-22 12:21:36 -0500438 help
439 This option enables various optimizations for running under the KVM
440 hypervisor.
441
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100442source "arch/x86/lguest/Kconfig"
443
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100444config PARAVIRT
445 bool "Enable paravirtualization code"
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100446 help
447 This changes the kernel so it can modify itself when it is run
448 under a hypervisor, potentially improving performance significantly
449 over full virtualization. However, when run without a hypervisor
450 the kernel is theoretically slower and slightly larger.
451
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200452config PARAVIRT_CLOCK
453 bool
454 default n
455
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100456endif
457
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400458config PARAVIRT_DEBUG
459 bool "paravirt-ops debugging"
460 depends on PARAVIRT && DEBUG_KERNEL
461 help
462 Enable to debug paravirt_ops internals. Specifically, BUG if
463 a paravirt_op is missing when it is called.
464
Yinghai Lu03273182008-04-18 17:49:15 -0700465config MEMTEST
466 bool "Memtest"
Yinghai Luc64df702008-03-21 18:56:19 -0700467 help
468 This option adds a kernel parameter 'memtest', which allows memtest
Yinghai Lu03273182008-04-18 17:49:15 -0700469 to be set.
470 memtest=0, mean disabled; -- default
471 memtest=1, mean do 1 test pattern;
472 ...
473 memtest=4, mean do 4 test patterns.
Thomas Gleixneraba37282008-07-15 14:48:48 +0200474 If you are unsure how to answer this question, answer N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100475
476config X86_SUMMIT_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100477 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100478 depends on X86_32 && NUMA && X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100479
480config X86_CYCLONE_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100481 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100482 depends on X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100483
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100484source "arch/x86/Kconfig.cpu"
485
486config HPET_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100487 def_bool X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100488 prompt "HPET Timer Support" if X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100489 help
490 Use the IA-PC HPET (High Precision Event Timer) to manage
491 time in preference to the PIT and RTC, if a HPET is
492 present.
493 HPET is the next generation timer replacing legacy 8254s.
494 The HPET provides a stable time base on SMP
495 systems, unlike the TSC, but it is more expensive to access,
496 as it is off-chip. You can find the HPET spec at
Denis V. Luneve45f2c02008-11-24 11:28:36 +0300497 <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100498
499 You can safely choose Y here. However, HPET will only be
500 activated if the platform and the BIOS support this feature.
501 Otherwise the 8254 will be used for timing services.
502
503 Choose N to continue using the legacy 8254 timer.
504
505config HPET_EMULATE_RTC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100506 def_bool y
Bernhard Walle9d8af782008-02-06 01:38:52 -0800507 depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100508
509# Mark as embedded because too many people got it wrong.
510# The code disables itself when not needed.
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700511config DMI
512 default y
513 bool "Enable DMI scanning" if EMBEDDED
514 help
515 Enabled scanning of DMI to identify machine quirks. Say Y
516 here unless you have verified that your setup is not
517 affected by entries in the DMI blacklist. Required by PNP
518 BIOS code.
519
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100520config GART_IOMMU
521 bool "GART IOMMU support" if EMBEDDED
522 default y
523 select SWIOTLB
524 select AGP
525 depends on X86_64 && PCI
526 help
527 Support for full DMA access of devices with 32bit memory access only
528 on systems with more than 3GB. This is usually needed for USB,
529 sound, many IDE/SATA chipsets and some other devices.
530 Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
531 based hardware IOMMU and a software bounce buffer based IOMMU used
532 on Intel systems and as fallback.
533 The code is only active when needed (enough memory and limited
534 device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
535 too.
536
537config CALGARY_IOMMU
538 bool "IBM Calgary IOMMU support"
539 select SWIOTLB
540 depends on X86_64 && PCI && EXPERIMENTAL
541 help
542 Support for hardware IOMMUs in IBM's xSeries x366 and x460
543 systems. Needed to run systems with more than 3GB of memory
544 properly with 32-bit PCI devices that do not support DAC
545 (Double Address Cycle). Calgary also supports bus level
546 isolation, where all DMAs pass through the IOMMU. This
547 prevents them from going anywhere except their intended
548 destination. This catches hard-to-find kernel bugs and
549 mis-behaving drivers and devices that do not use the DMA-API
550 properly to set up their DMA buffers. The IOMMU can be
551 turned off at boot time with the iommu=off parameter.
552 Normally the kernel will make the right choice by itself.
553 If unsure, say Y.
554
555config CALGARY_IOMMU_ENABLED_BY_DEFAULT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100556 def_bool y
557 prompt "Should Calgary be enabled by default?"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100558 depends on CALGARY_IOMMU
559 help
560 Should Calgary be enabled by default? if you choose 'y', Calgary
561 will be used (if it exists). If you choose 'n', Calgary will not be
562 used even if it exists. If you choose 'n' and would like to use
563 Calgary anyway, pass 'iommu=calgary' on the kernel command line.
564 If unsure, say Y.
565
Joerg Roedel2b188722008-06-26 21:27:37 +0200566config AMD_IOMMU
567 bool "AMD IOMMU support"
Ingo Molnar07c40e82008-06-27 11:31:28 +0200568 select SWIOTLB
Joerg Roedela80dc3e2008-09-11 16:51:41 +0200569 select PCI_MSI
Ingo Molnar24d2ba02008-06-27 10:37:03 +0200570 depends on X86_64 && PCI && ACPI
Joerg Roedel2b188722008-06-26 21:27:37 +0200571 help
Joerg Roedel18d22202008-07-03 19:35:06 +0200572 With this option you can enable support for AMD IOMMU hardware in
573 your system. An IOMMU is a hardware component which provides
574 remapping of DMA memory accesses from devices. With an AMD IOMMU you
575 can isolate the the DMA memory of different devices and protect the
576 system from misbehaving device drivers or hardware.
577
578 You can find out if your system has an AMD IOMMU if you look into
579 your BIOS for an option to enable it or if you have an IVRS ACPI
580 table.
Joerg Roedel2b188722008-06-26 21:27:37 +0200581
Joerg Roedel2e117602008-12-11 19:00:12 +0100582config AMD_IOMMU_STATS
583 bool "Export AMD IOMMU statistics to debugfs"
584 depends on AMD_IOMMU
585 select DEBUG_FS
586 help
587 This option enables code in the AMD IOMMU driver to collect various
588 statistics about whats happening in the driver and exports that
589 information to userspace via debugfs.
590 If unsure, say N.
591
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100592# need this always selected by IOMMU for the VIA workaround
593config SWIOTLB
Joerg Roedela1afd012008-11-18 12:44:21 +0100594 def_bool y if X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100595 help
596 Support for software bounce buffers used on x86-64 systems
597 which don't have a hardware IOMMU (e.g. the current generation
598 of Intel's x86-64 CPUs). Using this PCI devices which can only
599 access 32-bits of memory can be used on systems with more than
600 3 GB of memory. If unsure, say Y.
601
FUJITA Tomonoria8522502008-04-29 00:59:36 -0700602config IOMMU_HELPER
FUJITA Tomonori18b743d2008-07-10 09:50:50 +0900603 def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU)
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700604
Joerg Roedel1aaf1182008-11-26 17:25:13 +0100605config IOMMU_API
606 def_bool (AMD_IOMMU || DMAR)
607
Mike Travis1184dc22008-05-12 21:21:12 +0200608config MAXSMP
609 bool "Configure Maximum number of SMP Processors and NUMA Nodes"
Mike Travis36f51012008-12-16 17:33:51 -0800610 depends on X86_64 && SMP && DEBUG_KERNEL && EXPERIMENTAL
611 select CPUMASK_OFFSTACK
Mike Travis1184dc22008-05-12 21:21:12 +0200612 default n
613 help
614 Configure maximum number of CPUS and NUMA Nodes for this architecture.
615 If unsure, say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100616
617config NR_CPUS
Mike Travis36f51012008-12-16 17:33:51 -0800618 int "Maximum number of CPUs" if SMP && !MAXSMP
619 range 2 512 if SMP && !MAXSMP
Mike Travis78637a972008-12-16 17:34:00 -0800620 default "1" if !SMP
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700621 default "4096" if MAXSMP
Mike Travis78637a972008-12-16 17:34:00 -0800622 default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000)
623 default "8" if SMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100624 help
625 This allows you to specify the maximum number of CPUs which this
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700626 kernel will support. The maximum supported value is 512 and the
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100627 minimum value which makes sense is 2.
628
629 This is purely to save memory - each supported CPU adds
630 approximately eight kilobytes to the kernel image.
631
632config SCHED_SMT
633 bool "SMT (Hyperthreading) scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800634 depends on X86_HT
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100635 help
636 SMT scheduler support improves the CPU scheduler's decision making
637 when dealing with Intel Pentium 4 chips with HyperThreading at a
638 cost of slightly increased overhead in some places. If unsure say
639 N here.
640
641config SCHED_MC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100642 def_bool y
643 prompt "Multi-core scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800644 depends on X86_HT
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100645 help
646 Multi-core scheduler support improves the CPU scheduler's decision
647 making when dealing with multi-core CPU chips at a cost of slightly
648 increased overhead in some places. If unsure say N here.
649
650source "kernel/Kconfig.preempt"
651
652config X86_UP_APIC
653 bool "Local APIC support on uniprocessors"
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100654 depends on X86_32 && !SMP && !X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100655 help
656 A local APIC (Advanced Programmable Interrupt Controller) is an
657 integrated interrupt controller in the CPU. If you have a single-CPU
658 system which has a processor with a local APIC, you can say Y here to
659 enable and use it. If you say Y here even though your machine doesn't
660 have a local APIC, then the kernel will still run with no slowdown at
661 all. The local APIC supports CPU-generated self-interrupts (timer,
662 performance counters), and the NMI watchdog which detects hard
663 lockups.
664
665config X86_UP_IOAPIC
666 bool "IO-APIC support on uniprocessors"
667 depends on X86_UP_APIC
668 help
669 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
670 SMP-capable replacement for PC-style interrupt controllers. Most
671 SMP systems and many recent uniprocessor systems have one.
672
673 If you have a single-CPU system with an IO-APIC, you can say Y here
674 to use it. If you say Y here even though your machine doesn't have
675 an IO-APIC, then the kernel will still run with no slowdown at all.
676
677config X86_LOCAL_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100678 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100679 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100680
681config X86_IO_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100682 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +0100683 depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100684
685config X86_VISWS_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100686 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100687 depends on X86_32 && X86_VISWS
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100688
Stefan Assmann41b9eb22008-07-15 13:48:55 +0200689config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
690 bool "Reroute for broken boot IRQs"
691 default n
692 depends on X86_IO_APIC
693 help
694 This option enables a workaround that fixes a source of
695 spurious interrupts. This is recommended when threaded
696 interrupt handling is used on systems where the generation of
697 superfluous "boot interrupts" cannot be disabled.
698
699 Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
700 entry in the chipset's IO-APIC is masked (as, e.g. the RT
701 kernel does during interrupt handling). On chipsets where this
702 boot IRQ generation cannot be disabled, this workaround keeps
703 the original IRQ line masked so that only the equivalent "boot
704 IRQ" is delivered to the CPUs. The workaround also tells the
705 kernel to set up the IRQ handler on the boot IRQ line. In this
706 way only one interrupt is delivered to the kernel. Otherwise
707 the spurious second interrupt may cause the kernel to bring
708 down (vital) interrupt lines.
709
710 Only affects "broken" chipsets. Interrupt sharing may be
711 increased on these systems.
712
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100713config X86_MCE
714 bool "Machine Check Exception"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100715 ---help---
716 Machine Check Exception support allows the processor to notify the
717 kernel if it detects a problem (e.g. overheating, component failure).
718 The action the kernel takes depends on the severity of the problem,
719 ranging from a warning message on the console, to halting the machine.
720 Your processor must be a Pentium or newer to support this - check the
721 flags in /proc/cpuinfo for mce. Note that some older Pentium systems
722 have a design flaw which leads to false MCE events - hence MCE is
723 disabled on all P5 processors, unless explicitly enabled with "mce"
724 as a boot argument. Similarly, if MCE is built in and creates a
725 problem on some new non-standard machine, you can boot with "nomce"
726 to disable it. MCE support simply ignores non-MCE processors like
727 the 386 and 486, so nearly everyone can say Y here.
728
729config X86_MCE_INTEL
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100730 def_bool y
731 prompt "Intel MCE features"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100732 depends on X86_64 && X86_MCE && X86_LOCAL_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100733 help
734 Additional support for intel specific MCE features such as
735 the thermal monitor.
736
737config X86_MCE_AMD
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100738 def_bool y
739 prompt "AMD MCE features"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100740 depends on X86_64 && X86_MCE && X86_LOCAL_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100741 help
742 Additional support for AMD specific MCE features such as
743 the DRAM Error Threshold.
744
745config X86_MCE_NONFATAL
746 tristate "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4"
747 depends on X86_32 && X86_MCE
748 help
749 Enabling this feature starts a timer that triggers every 5 seconds which
750 will look at the machine check registers to see if anything happened.
751 Non-fatal problems automatically get corrected (but still logged).
752 Disable this if you don't want to see these messages.
753 Seeing the messages this option prints out may be indicative of dying
754 or out-of-spec (ie, overclocked) hardware.
755 This option only does something on certain CPUs.
756 (AMD Athlon/Duron and Intel Pentium 4)
757
758config X86_MCE_P4THERMAL
759 bool "check for P4 thermal throttling interrupt."
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200760 depends on X86_32 && X86_MCE && (X86_UP_APIC || SMP)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100761 help
762 Enabling this feature will cause a message to be printed when the P4
763 enters thermal throttling.
764
765config VM86
766 bool "Enable VM86 support" if EMBEDDED
767 default y
768 depends on X86_32
769 help
770 This option is required by programs like DOSEMU to run 16-bit legacy
771 code on X86 processors. It also may be needed by software like
772 XFree86 to initialize some video cards via BIOS. Disabling this
773 option saves about 6k.
774
775config TOSHIBA
776 tristate "Toshiba Laptop support"
777 depends on X86_32
778 ---help---
779 This adds a driver to safely access the System Management Mode of
780 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
781 not work on models with a Phoenix BIOS. The System Management Mode
782 is used to set the BIOS and power saving options on Toshiba portables.
783
784 For information on utilities to make use of this driver see the
785 Toshiba Linux utilities web site at:
786 <http://www.buzzard.org.uk/toshiba/>.
787
788 Say Y if you intend to run this kernel on a Toshiba portable.
789 Say N otherwise.
790
791config I8K
792 tristate "Dell laptop support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100793 ---help---
794 This adds a driver to safely access the System Management Mode
795 of the CPU on the Dell Inspiron 8000. The System Management Mode
796 is used to read cpu temperature and cooling fan status and to
797 control the fans on the I8K portables.
798
799 This driver has been tested only on the Inspiron 8000 but it may
800 also work with other Dell laptops. You can force loading on other
801 models by passing the parameter `force=1' to the module. Use at
802 your own risk.
803
804 For information on utilities to make use of this driver see the
805 I8K Linux utilities web site at:
806 <http://people.debian.org/~dz/i8k/>
807
808 Say Y if you intend to run this kernel on a Dell Inspiron 8000.
809 Say N otherwise.
810
811config X86_REBOOTFIXUPS
Jan Beulich9ba16082008-10-15 22:01:38 -0700812 bool "Enable X86 board specific fixups for reboot"
813 depends on X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100814 ---help---
815 This enables chipset and/or board specific fixups to be done
816 in order to get reboot to work correctly. This is only needed on
817 some combinations of hardware and BIOS. The symptom, for which
818 this config is intended, is when reboot ends with a stalled/hung
819 system.
820
821 Currently, the only fixup is for the Geode machines using
Florian Fainelli5e3a77e2008-01-30 13:33:36 +0100822 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100823
824 Say Y if you want to enable the fixup. Currently, it's safe to
825 enable this option even if you don't need it.
826 Say N otherwise.
827
828config MICROCODE
Peter Oruba8d86f392008-07-28 18:44:21 +0200829 tristate "/dev/cpu/microcode - microcode support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100830 select FW_LOADER
831 ---help---
832 If you say Y here, you will be able to update the microcode on
Peter Oruba80cc9f12008-07-28 18:44:22 +0200833 certain Intel and AMD processors. The Intel support is for the
834 IA32 family, e.g. Pentium Pro, Pentium II, Pentium III,
835 Pentium 4, Xeon etc. The AMD support is for family 0x10 and
836 0x11 processors, e.g. Opteron, Phenom and Turion 64 Ultra.
837 You will obviously need the actual microcode binary data itself
838 which is not shipped with the Linux kernel.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100839
Peter Oruba8d86f392008-07-28 18:44:21 +0200840 This option selects the general module only, you need to select
841 at least one vendor specific module as well.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100842
843 To compile this driver as a module, choose M here: the
844 module will be called microcode.
845
Peter Oruba8d86f392008-07-28 18:44:21 +0200846config MICROCODE_INTEL
Dmitry Adamushko18dbc912008-09-23 12:08:44 +0200847 bool "Intel microcode patch loading support"
Peter Oruba8d86f392008-07-28 18:44:21 +0200848 depends on MICROCODE
849 default MICROCODE
850 select FW_LOADER
851 --help---
852 This options enables microcode patch loading support for Intel
853 processors.
854
855 For latest news and information on obtaining all the required
856 Intel ingredients for this driver, check:
857 <http://www.urbanmyth.org/microcode/>.
858
Peter Oruba80cc9f12008-07-28 18:44:22 +0200859config MICROCODE_AMD
Dmitry Adamushko18dbc912008-09-23 12:08:44 +0200860 bool "AMD microcode patch loading support"
Peter Oruba80cc9f12008-07-28 18:44:22 +0200861 depends on MICROCODE
862 select FW_LOADER
863 --help---
864 If you select this option, microcode patch loading support for AMD
865 processors will be enabled.
866
Peter Oruba8d86f392008-07-28 18:44:21 +0200867 config MICROCODE_OLD_INTERFACE
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100868 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100869 depends on MICROCODE
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100870
871config X86_MSR
872 tristate "/dev/cpu/*/msr - Model-specific register support"
873 help
874 This device gives privileged processes access to the x86
875 Model-Specific Registers (MSRs). It is a character device with
876 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
877 MSR accesses are directed to a specific CPU on multi-processor
878 systems.
879
880config X86_CPUID
881 tristate "/dev/cpu/*/cpuid - CPU information support"
882 help
883 This device gives processes access to the x86 CPUID instruction to
884 be executed on a specific processor. It is a character device
885 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
886 /dev/cpu/31/cpuid.
887
888choice
889 prompt "High Memory Support"
890 default HIGHMEM4G if !X86_NUMAQ
891 default HIGHMEM64G if X86_NUMAQ
892 depends on X86_32
893
894config NOHIGHMEM
895 bool "off"
896 depends on !X86_NUMAQ
897 ---help---
898 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
899 However, the address space of 32-bit x86 processors is only 4
900 Gigabytes large. That means that, if you have a large amount of
901 physical memory, not all of it can be "permanently mapped" by the
902 kernel. The physical memory that's not permanently mapped is called
903 "high memory".
904
905 If you are compiling a kernel which will never run on a machine with
906 more than 1 Gigabyte total physical RAM, answer "off" here (default
907 choice and suitable for most users). This will result in a "3GB/1GB"
908 split: 3GB are mapped so that each process sees a 3GB virtual memory
909 space and the remaining part of the 4GB virtual memory space is used
910 by the kernel to permanently map as much physical memory as
911 possible.
912
913 If the machine has between 1 and 4 Gigabytes physical RAM, then
914 answer "4GB" here.
915
916 If more than 4 Gigabytes is used then answer "64GB" here. This
917 selection turns Intel PAE (Physical Address Extension) mode on.
918 PAE implements 3-level paging on IA32 processors. PAE is fully
919 supported by Linux, PAE mode is implemented on all recent Intel
920 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
921 then the kernel will not boot on CPUs that don't support PAE!
922
923 The actual amount of total physical memory will either be
924 auto detected or can be forced by using a kernel command line option
925 such as "mem=256M". (Try "man bootparam" or see the documentation of
926 your boot loader (lilo or loadlin) about how to pass options to the
927 kernel at boot time.)
928
929 If unsure, say "off".
930
931config HIGHMEM4G
932 bool "4GB"
933 depends on !X86_NUMAQ
934 help
935 Select this if you have a 32-bit processor and between 1 and 4
936 gigabytes of physical RAM.
937
938config HIGHMEM64G
939 bool "64GB"
940 depends on !M386 && !M486
941 select X86_PAE
942 help
943 Select this if you have a 32-bit processor and more than 4
944 gigabytes of physical RAM.
945
946endchoice
947
948choice
949 depends on EXPERIMENTAL
950 prompt "Memory split" if EMBEDDED
951 default VMSPLIT_3G
952 depends on X86_32
953 help
954 Select the desired split between kernel and user memory.
955
956 If the address range available to the kernel is less than the
957 physical memory installed, the remaining memory will be available
958 as "high memory". Accessing high memory is a little more costly
959 than low memory, as it needs to be mapped into the kernel first.
960 Note that increasing the kernel address space limits the range
961 available to user programs, making the address space there
962 tighter. Selecting anything other than the default 3G/1G split
963 will also likely make your kernel incompatible with binary-only
964 kernel modules.
965
966 If you are not absolutely sure what you are doing, leave this
967 option alone!
968
969 config VMSPLIT_3G
970 bool "3G/1G user/kernel split"
971 config VMSPLIT_3G_OPT
972 depends on !X86_PAE
973 bool "3G/1G user/kernel split (for full 1G low memory)"
974 config VMSPLIT_2G
975 bool "2G/2G user/kernel split"
976 config VMSPLIT_2G_OPT
977 depends on !X86_PAE
978 bool "2G/2G user/kernel split (for full 2G low memory)"
979 config VMSPLIT_1G
980 bool "1G/3G user/kernel split"
981endchoice
982
983config PAGE_OFFSET
984 hex
985 default 0xB0000000 if VMSPLIT_3G_OPT
986 default 0x80000000 if VMSPLIT_2G
987 default 0x78000000 if VMSPLIT_2G_OPT
988 default 0x40000000 if VMSPLIT_1G
989 default 0xC0000000
990 depends on X86_32
991
992config HIGHMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100993 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100994 depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100995
996config X86_PAE
Jan Beulich9ba16082008-10-15 22:01:38 -0700997 bool "PAE (Physical Address Extension) Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100998 depends on X86_32 && !HIGHMEM4G
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100999 help
1000 PAE is required for NX support, and furthermore enables
1001 larger swapspace support for non-overcommit purposes. It
1002 has the cost of more pagetable lookup overhead, and also
1003 consumes more pagetable space per process.
1004
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -07001005config ARCH_PHYS_ADDR_T_64BIT
1006 def_bool X86_64 || X86_PAE
1007
Nick Piggin9e899812008-10-22 12:33:16 +02001008config DIRECT_GBPAGES
1009 bool "Enable 1GB pages for kernel pagetables" if EMBEDDED
1010 default y
1011 depends on X86_64
1012 help
1013 Allow the kernel linear mapping to use 1GB pages on CPUs that
1014 support it. This can improve the kernel's performance a tiny bit by
1015 reducing TLB pressure. If in doubt, say "Y".
1016
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001017# Common NUMA Features
1018config NUMA
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001019 bool "Numa Memory Allocation and Scheduler Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001020 depends on SMP
Yinghai Lu0699eae2008-06-17 15:39:01 -07001021 depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001022 default n if X86_PC
Yinghai Lu0699eae2008-06-17 15:39:01 -07001023 default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001024 help
1025 Enable NUMA (Non Uniform Memory Access) support.
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001026
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001027 The kernel will try to allocate memory used by a CPU on the
1028 local memory controller of the CPU and add some more
1029 NUMA awareness to the kernel.
1030
Ingo Molnarc280ea52008-11-08 13:29:45 +01001031 For 64-bit this is recommended if the system is Intel Core i7
KOSAKI Motohirofd51b2d2008-11-05 02:27:19 +09001032 (or later), AMD Opteron, or EM64T NUMA.
1033
1034 For 32-bit this is only needed on (rare) 32-bit-only platforms
1035 that support NUMA topologies, such as NUMAQ / Summit, or if you
1036 boot a 32-bit kernel on a 64-bit NUMA platform.
1037
1038 Otherwise, you should say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001039
1040comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
1041 depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
1042
1043config K8_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001044 def_bool y
1045 prompt "Old style AMD Opteron NUMA detection"
1046 depends on X86_64 && NUMA && PCI
1047 help
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001048 Enable K8 NUMA node topology detection. You should say Y here if
1049 you have a multi processor AMD K8 system. This uses an old
1050 method to read the NUMA configuration directly from the builtin
1051 Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
1052 instead, which also takes priority if both are compiled in.
1053
1054config X86_64_ACPI_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001055 def_bool y
1056 prompt "ACPI NUMA detection"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001057 depends on X86_64 && NUMA && ACPI && PCI
1058 select ACPI_NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001059 help
1060 Enable ACPI SRAT based node topology detection.
1061
Suresh Siddha6ec6e0d2008-03-25 10:14:35 -07001062# Some NUMA nodes have memory ranges that span
1063# other nodes. Even though a pfn is valid and
1064# between a node's start and end pfns, it may not
1065# reside on that node. See memmap_init_zone()
1066# for details.
1067config NODES_SPAN_OTHER_NODES
1068 def_bool y
1069 depends on X86_64_ACPI_NUMA
1070
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001071config NUMA_EMU
1072 bool "NUMA emulation"
1073 depends on X86_64 && NUMA
1074 help
1075 Enable NUMA emulation. A flat machine will be split
1076 into virtual nodes when booted with "numa=fake=N", where N is the
1077 number of nodes. This is only useful for debugging.
1078
1079config NODES_SHIFT
Linus Torvaldsd25e26b2008-08-25 14:15:38 -07001080 int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
Mike Travis1184dc22008-05-12 21:21:12 +02001081 range 1 9 if X86_64
Linus Torvaldsd25e26b2008-08-25 14:15:38 -07001082 default "9" if MAXSMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001083 default "6" if X86_64
1084 default "4" if X86_NUMAQ
1085 default "3"
1086 depends on NEED_MULTIPLE_NODES
Mike Travis1184dc22008-05-12 21:21:12 +02001087 help
1088 Specify the maximum number of NUMA Nodes available on the target
1089 system. Increases memory reserved to accomodate various tables.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001090
1091config HAVE_ARCH_BOOTMEM_NODE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001092 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001093 depends on X86_32 && NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001094
1095config ARCH_HAVE_MEMORY_PRESENT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001096 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001097 depends on X86_32 && DISCONTIGMEM
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001098
1099config NEED_NODE_MEMMAP_SIZE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001100 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001101 depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001102
1103config HAVE_ARCH_ALLOC_REMAP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001104 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001105 depends on X86_32 && NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001106
1107config ARCH_FLATMEM_ENABLE
1108 def_bool y
Jeff Chua99809962008-08-06 19:09:53 +08001109 depends on X86_32 && ARCH_SELECT_MEMORY_MODEL && !NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001110
1111config ARCH_DISCONTIGMEM_ENABLE
1112 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001113 depends on NUMA && X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001114
1115config ARCH_DISCONTIGMEM_DEFAULT
1116 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001117 depends on NUMA && X86_32
1118
1119config ARCH_SPARSEMEM_DEFAULT
1120 def_bool y
1121 depends on X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001122
1123config ARCH_SPARSEMEM_ENABLE
1124 def_bool y
Ingo Molnare0c7ae32009-01-27 18:43:09 +01001125 depends on X86_64 || NUMA || (EXPERIMENTAL && X86_PC) || X86_32_NON_STANDARD
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001126 select SPARSEMEM_STATIC if X86_32
1127 select SPARSEMEM_VMEMMAP_ENABLE if X86_64
1128
1129config ARCH_SELECT_MEMORY_MODEL
1130 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001131 depends on ARCH_SPARSEMEM_ENABLE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001132
1133config ARCH_MEMORY_PROBE
1134 def_bool X86_64
1135 depends on MEMORY_HOTPLUG
1136
1137source "mm/Kconfig"
1138
1139config HIGHPTE
1140 bool "Allocate 3rd-level pagetables from highmem"
1141 depends on X86_32 && (HIGHMEM4G || HIGHMEM64G)
1142 help
1143 The VM uses one page table entry for each page of physical memory.
1144 For systems with a lot of RAM, this can be wasteful of precious
1145 low memory. Setting this option will put user-space page table
1146 entries in high memory.
1147
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001148config X86_CHECK_BIOS_CORRUPTION
1149 bool "Check for low memory corruption"
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001150 help
1151 Periodically check for memory corruption in low memory, which
1152 is suspected to be caused by BIOS. Even when enabled in the
1153 configuration, it is disabled at runtime. Enable it by
1154 setting "memory_corruption_check=1" on the kernel command
1155 line. By default it scans the low 64k of memory every 60
1156 seconds; see the memory_corruption_check_size and
1157 memory_corruption_check_period parameters in
1158 Documentation/kernel-parameters.txt to adjust this.
1159
1160 When enabled with the default parameters, this option has
1161 almost no overhead, as it reserves a relatively small amount
1162 of memory and scans it infrequently. It both detects corruption
1163 and prevents it from affecting the running system.
1164
1165 It is, however, intended as a diagnostic tool; if repeatable
1166 BIOS-originated corruption always affects the same memory,
1167 you can use memmap= to prevent the kernel from using that
1168 memory.
1169
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001170config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
1171 bool "Set the default setting of memory_corruption_check"
1172 depends on X86_CHECK_BIOS_CORRUPTION
1173 default y
1174 help
1175 Set whether the default state of memory_corruption_check is
1176 on or off.
1177
Ingo Molnarfc381512008-09-16 10:07:34 +02001178config X86_RESERVE_LOW_64K
1179 bool "Reserve low 64K of RAM on AMI/Phoenix BIOSen"
1180 default y
1181 help
1182 Reserve the first 64K of physical RAM on BIOSes that are known
1183 to potentially corrupt that memory range. A numbers of BIOSes are
1184 known to utilize this area during suspend/resume, so it must not
1185 be used by the kernel.
1186
1187 Set this to N if you are absolutely sure that you trust the BIOS
1188 to get all its memory reservations and usages right.
1189
1190 If you have doubts about the BIOS (e.g. suspend/resume does not
1191 work or there's kernel crashes after certain hardware hotplug
1192 events) and it's not AMI or Phoenix, then you might want to enable
1193 X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check typical
1194 corruption patterns.
1195
1196 Say Y if unsure.
1197
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001198config MATH_EMULATION
1199 bool
1200 prompt "Math emulation" if X86_32
1201 ---help---
1202 Linux can emulate a math coprocessor (used for floating point
1203 operations) if you don't have one. 486DX and Pentium processors have
1204 a math coprocessor built in, 486SX and 386 do not, unless you added
1205 a 487DX or 387, respectively. (The messages during boot time can
1206 give you some hints here ["man dmesg"].) Everyone needs either a
1207 coprocessor or this emulation.
1208
1209 If you don't have a math coprocessor, you need to say Y here; if you
1210 say Y here even though you have a coprocessor, the coprocessor will
1211 be used nevertheless. (This behavior can be changed with the kernel
1212 command line option "no387", which comes handy if your coprocessor
1213 is broken. Try "man bootparam" or see the documentation of your boot
1214 loader (lilo or loadlin) about how to pass options to the kernel at
1215 boot time.) This means that it is a good idea to say Y here if you
1216 intend to use this kernel on different machines.
1217
1218 More information about the internals of the Linux math coprocessor
1219 emulation can be found in <file:arch/x86/math-emu/README>.
1220
1221 If you are not sure, say Y; apart from resulting in a 66 KB bigger
1222 kernel, it won't hurt.
1223
1224config MTRR
1225 bool "MTRR (Memory Type Range Register) support"
1226 ---help---
1227 On Intel P6 family processors (Pentium Pro, Pentium II and later)
1228 the Memory Type Range Registers (MTRRs) may be used to control
1229 processor access to memory ranges. This is most useful if you have
1230 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
1231 allows bus write transfers to be combined into a larger transfer
1232 before bursting over the PCI/AGP bus. This can increase performance
1233 of image write operations 2.5 times or more. Saying Y here creates a
1234 /proc/mtrr file which may be used to manipulate your processor's
1235 MTRRs. Typically the X server should use this.
1236
1237 This code has a reasonably generic interface so that similar
1238 control registers on other processors can be easily supported
1239 as well:
1240
1241 The Cyrix 6x86, 6x86MX and M II processors have Address Range
1242 Registers (ARRs) which provide a similar functionality to MTRRs. For
1243 these, the ARRs are used to emulate the MTRRs.
1244 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
1245 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
1246 write-combining. All of these processors are supported by this code
1247 and it makes sense to say Y here if you have one of them.
1248
1249 Saying Y here also fixes a problem with buggy SMP BIOSes which only
1250 set the MTRRs for the boot CPU and not for the secondary CPUs. This
1251 can lead to all sorts of problems, so it's good to say Y here.
1252
1253 You can safely say Y even if your machine doesn't have MTRRs, you'll
1254 just add about 9 KB to your kernel.
1255
Randy Dunlap7225e752008-07-26 17:54:22 -07001256 See <file:Documentation/x86/mtrr.txt> for more information.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001257
Yinghai Lu95ffa242008-04-29 03:52:33 -07001258config MTRR_SANITIZER
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001259 def_bool y
Yinghai Lu95ffa242008-04-29 03:52:33 -07001260 prompt "MTRR cleanup support"
1261 depends on MTRR
1262 help
Thomas Gleixneraba37282008-07-15 14:48:48 +02001263 Convert MTRR layout from continuous to discrete, so X drivers can
1264 add writeback entries.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001265
Thomas Gleixneraba37282008-07-15 14:48:48 +02001266 Can be disabled with disable_mtrr_cleanup on the kernel command line.
1267 The largest mtrr entry size for a continous block can be set with
1268 mtrr_chunk_size.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001269
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001270 If unsure, say Y.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001271
1272config MTRR_SANITIZER_ENABLE_DEFAULT
Yinghai Luf5098d62008-04-29 20:25:58 -07001273 int "MTRR cleanup enable value (0-1)"
1274 range 0 1
1275 default "0"
Yinghai Lu95ffa242008-04-29 03:52:33 -07001276 depends on MTRR_SANITIZER
1277 help
Yinghai Luf5098d62008-04-29 20:25:58 -07001278 Enable mtrr cleanup default value
Yinghai Lu95ffa242008-04-29 03:52:33 -07001279
Yinghai Lu12031a62008-05-02 02:40:22 -07001280config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
1281 int "MTRR cleanup spare reg num (0-7)"
1282 range 0 7
1283 default "1"
1284 depends on MTRR_SANITIZER
1285 help
1286 mtrr cleanup spare entries default, it can be changed via
Thomas Gleixneraba37282008-07-15 14:48:48 +02001287 mtrr_spare_reg_nr=N on the kernel command line.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001288
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001289config X86_PAT
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001290 bool
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001291 prompt "x86 PAT support"
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001292 depends on MTRR
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001293 help
1294 Use PAT attributes to setup page level cache control.
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001295
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001296 PATs are the modern equivalents of MTRRs and are much more
1297 flexible than MTRRs.
1298
1299 Say N here if you see bootup problems (boot crash, boot hang,
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001300 spontaneous reboots) or a non-working video driver.
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001301
1302 If unsure, say Y.
1303
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001304config EFI
Jan Beulich9ba16082008-10-15 22:01:38 -07001305 bool "EFI runtime service support"
Huang, Ying5b836832008-01-30 13:31:19 +01001306 depends on ACPI
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001307 ---help---
Huang, Ying8b2cb7a2008-01-30 13:32:11 +01001308 This enables the kernel to use EFI runtime services that are
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001309 available (such as the EFI variable services).
1310
Huang, Ying8b2cb7a2008-01-30 13:32:11 +01001311 This option is only useful on systems that have EFI firmware.
1312 In addition, you should use the latest ELILO loader available
1313 at <http://elilo.sourceforge.net> in order to take advantage
1314 of EFI runtime services. However, even with this option, the
1315 resultant kernel should continue to boot on existing non-EFI
1316 platforms.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001317
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001318config SECCOMP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001319 def_bool y
1320 prompt "Enable seccomp to safely compute untrusted bytecode"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001321 help
1322 This kernel feature is useful for number crunching applications
1323 that may need to compute untrusted bytecode during their
1324 execution. By using pipes or other transports made available to
1325 the process as file descriptors supporting the read/write
1326 syscalls, it's possible to isolate those applications in
1327 their own address space using seccomp. Once seccomp is
Alexey Dobriyan9c0bbee2008-09-09 11:01:31 +04001328 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001329 and the task is only allowed to execute a few safe syscalls
1330 defined by each seccomp mode.
1331
1332 If unsure, say Y. Only embedded should say N here.
1333
Ingo Molnar113c5412008-02-14 10:36:03 +01001334config CC_STACKPROTECTOR_ALL
1335 bool
1336
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001337config CC_STACKPROTECTOR
1338 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
Ingo Molnar72370f22008-02-13 16:15:34 +01001339 depends on X86_64
Ingo Molnar113c5412008-02-14 10:36:03 +01001340 select CC_STACKPROTECTOR_ALL
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001341 help
Ingo Molnar113c5412008-02-14 10:36:03 +01001342 This option turns on the -fstack-protector GCC feature. This
1343 feature puts, at the beginning of functions, a canary value on
1344 the stack just before the return address, and validates
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001345 the value just before actually returning. Stack based buffer
1346 overflows (that need to overwrite this return address) now also
1347 overwrite the canary, which gets detected and the attack is then
1348 neutralized via a kernel panic.
1349
1350 This feature requires gcc version 4.2 or above, or a distribution
1351 gcc with the feature backported. Older versions are automatically
Ingo Molnar113c5412008-02-14 10:36:03 +01001352 detected and for those versions, this configuration option is
1353 ignored. (and a warning is printed during bootup)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001354
1355source kernel/Kconfig.hz
1356
1357config KEXEC
1358 bool "kexec system call"
1359 help
1360 kexec is a system call that implements the ability to shutdown your
1361 current kernel, and to start another kernel. It is like a reboot
1362 but it is independent of the system firmware. And like a reboot
1363 you can start any kernel with it, not just Linux.
1364
1365 The name comes from the similarity to the exec system call.
1366
1367 It is an ongoing process to be certain the hardware in a machine
1368 is properly shutdown, so do not be surprised if this code does not
1369 initially work for you. It may help to enable device hotplugging
1370 support. As of this writing the exact hardware interface is
1371 strongly in flux, so no good recommendation can be made.
1372
1373config CRASH_DUMP
Pavel Machek04b69442008-08-14 17:16:50 +02001374 bool "kernel crash dumps"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001375 depends on X86_64 || (X86_32 && HIGHMEM)
1376 help
1377 Generate crash dump after being started by kexec.
1378 This should be normally only set in special crash dump kernels
1379 which are loaded in the main kernel with kexec-tools into
1380 a specially reserved region and then later executed after
1381 a crash by kdump/kexec. The crash dump kernel must be compiled
1382 to a memory address not used by the main kernel or BIOS using
1383 PHYSICAL_START, or it must be built as a relocatable image
1384 (CONFIG_RELOCATABLE=y).
1385 For more details see Documentation/kdump/kdump.txt
1386
Huang Ying3ab83522008-07-25 19:45:07 -07001387config KEXEC_JUMP
1388 bool "kexec jump (EXPERIMENTAL)"
1389 depends on EXPERIMENTAL
Huang Ying89081d12008-07-25 19:45:10 -07001390 depends on KEXEC && HIBERNATION && X86_32
Huang Ying3ab83522008-07-25 19:45:07 -07001391 help
Huang Ying89081d12008-07-25 19:45:10 -07001392 Jump between original kernel and kexeced kernel and invoke
1393 code in physical address mode via KEXEC
Huang Ying3ab83522008-07-25 19:45:07 -07001394
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001395config PHYSICAL_START
1396 hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
1397 default "0x1000000" if X86_NUMAQ
1398 default "0x200000" if X86_64
1399 default "0x100000"
1400 help
1401 This gives the physical address where the kernel is loaded.
1402
1403 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
1404 bzImage will decompress itself to above physical address and
1405 run from there. Otherwise, bzImage will run from the address where
1406 it has been loaded by the boot loader and will ignore above physical
1407 address.
1408
1409 In normal kdump cases one does not have to set/change this option
1410 as now bzImage can be compiled as a completely relocatable image
1411 (CONFIG_RELOCATABLE=y) and be used to load and run from a different
1412 address. This option is mainly useful for the folks who don't want
1413 to use a bzImage for capturing the crash dump and want to use a
1414 vmlinux instead. vmlinux is not relocatable hence a kernel needs
1415 to be specifically compiled to run from a specific memory area
1416 (normally a reserved region) and this option comes handy.
1417
1418 So if you are using bzImage for capturing the crash dump, leave
1419 the value here unchanged to 0x100000 and set CONFIG_RELOCATABLE=y.
1420 Otherwise if you plan to use vmlinux for capturing the crash dump
1421 change this value to start of the reserved region (Typically 16MB
1422 0x1000000). In other words, it can be set based on the "X" value as
1423 specified in the "crashkernel=YM@XM" command line boot parameter
1424 passed to the panic-ed kernel. Typically this parameter is set as
1425 crashkernel=64M@16M. Please take a look at
1426 Documentation/kdump/kdump.txt for more details about crash dumps.
1427
1428 Usage of bzImage for capturing the crash dump is recommended as
1429 one does not have to build two kernels. Same kernel can be used
1430 as production kernel and capture kernel. Above option should have
1431 gone away after relocatable bzImage support is introduced. But it
1432 is present because there are users out there who continue to use
1433 vmlinux for dump capture. This option should go away down the
1434 line.
1435
1436 Don't change this unless you know what you are doing.
1437
1438config RELOCATABLE
1439 bool "Build a relocatable kernel (EXPERIMENTAL)"
1440 depends on EXPERIMENTAL
1441 help
1442 This builds a kernel image that retains relocation information
1443 so it can be loaded someplace besides the default 1MB.
1444 The relocations tend to make the kernel binary about 10% larger,
1445 but are discarded at runtime.
1446
1447 One use is for the kexec on panic case where the recovery kernel
1448 must live at a different physical address than the primary
1449 kernel.
1450
1451 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
1452 it has been loaded at and the compile time physical address
1453 (CONFIG_PHYSICAL_START) is ignored.
1454
1455config PHYSICAL_ALIGN
1456 hex
1457 prompt "Alignment value to which kernel should be aligned" if X86_32
1458 default "0x100000" if X86_32
1459 default "0x200000" if X86_64
1460 range 0x2000 0x400000
1461 help
1462 This value puts the alignment restrictions on physical address
1463 where kernel is loaded and run from. Kernel is compiled for an
1464 address which meets above alignment restriction.
1465
1466 If bootloader loads the kernel at a non-aligned address and
1467 CONFIG_RELOCATABLE is set, kernel will move itself to nearest
1468 address aligned to above value and run from there.
1469
1470 If bootloader loads the kernel at a non-aligned address and
1471 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
1472 load address and decompress itself to the address it has been
1473 compiled for and run from there. The address for which kernel is
1474 compiled already meets above alignment restrictions. Hence the
1475 end result is that kernel runs from a physical address meeting
1476 above alignment restrictions.
1477
1478 Don't change this unless you know what you are doing.
1479
1480config HOTPLUG_CPU
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001481 bool "Support for hot-pluggable CPUs"
Ingo Molnar4b19ed912009-01-27 17:47:24 +01001482 depends on SMP && HOTPLUG
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001483 ---help---
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001484 Say Y here to allow turning CPUs off and on. CPUs can be
1485 controlled through /sys/devices/system/cpu.
1486 ( Note: power management support will enable this option
1487 automatically on SMP systems. )
1488 Say N if you want to disable CPU hotplug.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001489
1490config COMPAT_VDSO
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001491 def_bool y
1492 prompt "Compat VDSO support"
Roland McGrathaf65d642008-01-30 13:30:43 +01001493 depends on X86_32 || IA32_EMULATION
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001494 help
Roland McGrathaf65d642008-01-30 13:30:43 +01001495 Map the 32-bit VDSO to the predictable old-style address too.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001496 ---help---
1497 Say N here if you are running a sufficiently recent glibc
1498 version (2.3.3 or later), to remove the high-mapped
1499 VDSO mapping and to exclusively use the randomized VDSO.
1500
1501 If unsure, say Y.
1502
Tim Bird516cbf32008-08-12 12:52:36 -07001503config CMDLINE_BOOL
1504 bool "Built-in kernel command line"
1505 default n
1506 help
1507 Allow for specifying boot arguments to the kernel at
1508 build time. On some systems (e.g. embedded ones), it is
1509 necessary or convenient to provide some or all of the
1510 kernel boot arguments with the kernel itself (that is,
1511 to not rely on the boot loader to provide them.)
1512
1513 To compile command line arguments into the kernel,
1514 set this option to 'Y', then fill in the
1515 the boot arguments in CONFIG_CMDLINE.
1516
1517 Systems with fully functional boot loaders (i.e. non-embedded)
1518 should leave this option set to 'N'.
1519
1520config CMDLINE
1521 string "Built-in kernel command string"
1522 depends on CMDLINE_BOOL
1523 default ""
1524 help
1525 Enter arguments here that should be compiled into the kernel
1526 image and used at boot time. If the boot loader provides a
1527 command line at boot time, it is appended to this string to
1528 form the full kernel command line, when the system boots.
1529
1530 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
1531 change this behavior.
1532
1533 In most cases, the command line (whether built-in or provided
1534 by the boot loader) should specify the device for the root
1535 file system.
1536
1537config CMDLINE_OVERRIDE
1538 bool "Built-in command line overrides boot loader arguments"
1539 default n
1540 depends on CMDLINE_BOOL
1541 help
1542 Set this option to 'Y' to have the kernel ignore the boot loader
1543 command line, and use ONLY the built-in command line.
1544
1545 This is used to work around broken boot loaders. This should
1546 be set to 'N' under normal conditions.
1547
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001548endmenu
1549
1550config ARCH_ENABLE_MEMORY_HOTPLUG
1551 def_bool y
1552 depends on X86_64 || (X86_32 && HIGHMEM)
1553
Gary Hade35551052008-10-31 10:52:03 -07001554config ARCH_ENABLE_MEMORY_HOTREMOVE
1555 def_bool y
1556 depends on MEMORY_HOTPLUG
1557
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001558config HAVE_ARCH_EARLY_PFN_TO_NID
1559 def_bool X86_64
1560 depends on NUMA
1561
Bjorn Helgaasda85f862008-11-05 13:37:27 -06001562menu "Power management and ACPI options"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001563
1564config ARCH_HIBERNATION_HEADER
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001565 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001566 depends on X86_64 && HIBERNATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001567
1568source "kernel/power/Kconfig"
1569
1570source "drivers/acpi/Kconfig"
1571
Andi Kleena6b68072008-01-30 13:32:49 +01001572config X86_APM_BOOT
1573 bool
1574 default y
1575 depends on APM || APM_MODULE
1576
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001577menuconfig APM
1578 tristate "APM (Advanced Power Management) BIOS support"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001579 depends on X86_32 && PM_SLEEP
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001580 ---help---
1581 APM is a BIOS specification for saving power using several different
1582 techniques. This is mostly useful for battery powered laptops with
1583 APM compliant BIOSes. If you say Y here, the system time will be
1584 reset after a RESUME operation, the /proc/apm device will provide
1585 battery status information, and user-space programs will receive
1586 notification of APM "events" (e.g. battery status change).
1587
1588 If you select "Y" here, you can disable actual use of the APM
1589 BIOS by passing the "apm=off" option to the kernel at boot time.
1590
1591 Note that the APM support is almost completely disabled for
1592 machines with more than one CPU.
1593
1594 In order to use APM, you will need supporting software. For location
Randy Dunlap53471122008-03-12 18:10:51 -04001595 and more information, read <file:Documentation/power/pm.txt> and the
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001596 Battery Powered Linux mini-HOWTO, available from
1597 <http://www.tldp.org/docs.html#howto>.
1598
1599 This driver does not spin down disk drives (see the hdparm(8)
1600 manpage ("man 8 hdparm") for that), and it doesn't turn off
1601 VESA-compliant "green" monitors.
1602
1603 This driver does not support the TI 4000M TravelMate and the ACER
1604 486/DX4/75 because they don't have compliant BIOSes. Many "green"
1605 desktop machines also don't have compliant BIOSes, and this driver
1606 may cause those machines to panic during the boot phase.
1607
1608 Generally, if you don't have a battery in your machine, there isn't
1609 much point in using this driver and you should say N. If you get
1610 random kernel OOPSes or reboots that don't seem to be related to
1611 anything, try disabling/enabling this option (or disabling/enabling
1612 APM in your BIOS).
1613
1614 Some other things you should try when experiencing seemingly random,
1615 "weird" problems:
1616
1617 1) make sure that you have enough swap space and that it is
1618 enabled.
1619 2) pass the "no-hlt" option to the kernel
1620 3) switch on floating point emulation in the kernel and pass
1621 the "no387" option to the kernel
1622 4) pass the "floppy=nodma" option to the kernel
1623 5) pass the "mem=4M" option to the kernel (thereby disabling
1624 all but the first 4 MB of RAM)
1625 6) make sure that the CPU is not over clocked.
1626 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
1627 8) disable the cache from your BIOS settings
1628 9) install a fan for the video card or exchange video RAM
1629 10) install a better fan for the CPU
1630 11) exchange RAM chips
1631 12) exchange the motherboard.
1632
1633 To compile this driver as a module, choose M here: the
1634 module will be called apm.
1635
1636if APM
1637
1638config APM_IGNORE_USER_SUSPEND
1639 bool "Ignore USER SUSPEND"
1640 help
1641 This option will ignore USER SUSPEND requests. On machines with a
1642 compliant APM BIOS, you want to say N. However, on the NEC Versa M
1643 series notebooks, it is necessary to say Y because of a BIOS bug.
1644
1645config APM_DO_ENABLE
1646 bool "Enable PM at boot time"
1647 ---help---
1648 Enable APM features at boot time. From page 36 of the APM BIOS
1649 specification: "When disabled, the APM BIOS does not automatically
1650 power manage devices, enter the Standby State, enter the Suspend
1651 State, or take power saving steps in response to CPU Idle calls."
1652 This driver will make CPU Idle calls when Linux is idle (unless this
1653 feature is turned off -- see "Do CPU IDLE calls", below). This
1654 should always save battery power, but more complicated APM features
1655 will be dependent on your BIOS implementation. You may need to turn
1656 this option off if your computer hangs at boot time when using APM
1657 support, or if it beeps continuously instead of suspending. Turn
1658 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
1659 T400CDT. This is off by default since most machines do fine without
1660 this feature.
1661
1662config APM_CPU_IDLE
1663 bool "Make CPU Idle calls when idle"
1664 help
1665 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
1666 On some machines, this can activate improved power savings, such as
1667 a slowed CPU clock rate, when the machine is idle. These idle calls
1668 are made after the idle loop has run for some length of time (e.g.,
1669 333 mS). On some machines, this will cause a hang at boot time or
1670 whenever the CPU becomes idle. (On machines with more than one CPU,
1671 this option does nothing.)
1672
1673config APM_DISPLAY_BLANK
1674 bool "Enable console blanking using APM"
1675 help
1676 Enable console blanking using the APM. Some laptops can use this to
1677 turn off the LCD backlight when the screen blanker of the Linux
1678 virtual console blanks the screen. Note that this is only used by
1679 the virtual console screen blanker, and won't turn off the backlight
1680 when using the X Window system. This also doesn't have anything to
1681 do with your VESA-compliant power-saving monitor. Further, this
1682 option doesn't work for all laptops -- it might not turn off your
1683 backlight at all, or it might print a lot of errors to the console,
1684 especially if you are using gpm.
1685
1686config APM_ALLOW_INTS
1687 bool "Allow interrupts during APM BIOS calls"
1688 help
1689 Normally we disable external interrupts while we are making calls to
1690 the APM BIOS as a measure to lessen the effects of a badly behaving
1691 BIOS implementation. The BIOS should reenable interrupts if it
1692 needs to. Unfortunately, some BIOSes do not -- especially those in
1693 many of the newer IBM Thinkpads. If you experience hangs when you
1694 suspend, try setting this to Y. Otherwise, say N.
1695
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001696endif # APM
1697
1698source "arch/x86/kernel/cpu/cpufreq/Kconfig"
1699
1700source "drivers/cpuidle/Kconfig"
1701
Andy Henroid27471fd2008-10-09 11:45:22 -07001702source "drivers/idle/Kconfig"
1703
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001704endmenu
1705
1706
1707menu "Bus options (PCI etc.)"
1708
1709config PCI
Ingo Molnar1ac97012008-05-19 14:10:14 +02001710 bool "PCI support"
Adrian Bunk1c858082008-01-30 13:32:32 +01001711 default y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001712 select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
1713 help
1714 Find out whether you have a PCI motherboard. PCI is the name of a
1715 bus system, i.e. the way the CPU talks to the other stuff inside
1716 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1717 VESA. If you have PCI, say Y, otherwise N.
1718
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001719choice
1720 prompt "PCI access mode"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001721 depends on X86_32 && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001722 default PCI_GOANY
1723 ---help---
1724 On PCI systems, the BIOS can be used to detect the PCI devices and
1725 determine their configuration. However, some old PCI motherboards
1726 have BIOS bugs and may crash if this is done. Also, some embedded
1727 PCI-based systems don't have any BIOS at all. Linux can also try to
1728 detect the PCI hardware directly without using the BIOS.
1729
1730 With this option, you can specify how Linux should detect the
1731 PCI devices. If you choose "BIOS", the BIOS will be used,
1732 if you choose "Direct", the BIOS won't be used, and if you
1733 choose "MMConfig", then PCI Express MMCONFIG will be used.
1734 If you choose "Any", the kernel will try MMCONFIG, then the
1735 direct access method and falls back to the BIOS if that doesn't
1736 work. If unsure, go with the default, which is "Any".
1737
1738config PCI_GOBIOS
1739 bool "BIOS"
1740
1741config PCI_GOMMCONFIG
1742 bool "MMConfig"
1743
1744config PCI_GODIRECT
1745 bool "Direct"
1746
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001747config PCI_GOOLPC
1748 bool "OLPC"
1749 depends on OLPC
1750
Andres Salomon2bdd1b02008-06-05 14:14:41 -07001751config PCI_GOANY
1752 bool "Any"
1753
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001754endchoice
1755
1756config PCI_BIOS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001757 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001758 depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001759
1760# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
1761config PCI_DIRECT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001762 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001763 depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001764
1765config PCI_MMCONFIG
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001766 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001767 depends on X86_32 && PCI && ACPI && (PCI_GOMMCONFIG || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001768
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001769config PCI_OLPC
Andres Salomon2bdd1b02008-06-05 14:14:41 -07001770 def_bool y
1771 depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001772
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001773config PCI_DOMAINS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001774 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001775 depends on PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001776
1777config PCI_MMCONFIG
1778 bool "Support mmconfig PCI config space access"
1779 depends on X86_64 && PCI && ACPI
1780
1781config DMAR
1782 bool "Support for DMA Remapping Devices (EXPERIMENTAL)"
1783 depends on X86_64 && PCI_MSI && ACPI && EXPERIMENTAL
1784 help
1785 DMA remapping (DMAR) devices support enables independent address
1786 translations for Direct Memory Access (DMA) from devices.
1787 These DMA remapping devices are reported via ACPI tables
1788 and include PCI device scope covered by these DMA
1789 remapping devices.
1790
1791config DMAR_GFX_WA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001792 def_bool y
1793 prompt "Support for Graphics workaround"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001794 depends on DMAR
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001795 help
1796 Current Graphics drivers tend to use physical address
1797 for DMA and avoid using DMA APIs. Setting this config
1798 option permits the IOMMU driver to set a unity map for
1799 all the OS-visible memory. Hence the driver can continue
1800 to use physical addresses for DMA.
1801
1802config DMAR_FLOPPY_WA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001803 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001804 depends on DMAR
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001805 help
1806 Floppy disk drivers are know to bypass DMA API calls
1807 thereby failing to work when IOMMU is enabled. This
1808 workaround will setup a 1:1 mapping for the first
1809 16M to make floppy (an ISA device) work.
1810
Suresh Siddha9fa8c482008-07-10 11:17:00 -07001811config INTR_REMAP
1812 bool "Support for Interrupt Remapping (EXPERIMENTAL)"
1813 depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI && EXPERIMENTAL
1814 help
1815 Supports Interrupt remapping for IO-APIC and MSI devices.
1816 To use x2apic mode in the CPU's which support x2APIC enhancements or
1817 to support platforms with CPU's having > 8 bit APIC ID, say Y.
1818
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001819source "drivers/pci/pcie/Kconfig"
1820
1821source "drivers/pci/Kconfig"
1822
1823# x86_64 have no ISA slots, but do have ISA-style DMA.
1824config ISA_DMA_API
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001825 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001826
1827if X86_32
1828
1829config ISA
1830 bool "ISA support"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001831 help
1832 Find out whether you have ISA slots on your motherboard. ISA is the
1833 name of a bus system, i.e. the way the CPU talks to the other stuff
1834 inside your box. Other bus systems are PCI, EISA, MicroChannel
1835 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1836 newer boards don't support it. If you have ISA, say Y, otherwise N.
1837
1838config EISA
1839 bool "EISA support"
1840 depends on ISA
1841 ---help---
1842 The Extended Industry Standard Architecture (EISA) bus was
1843 developed as an open alternative to the IBM MicroChannel bus.
1844
1845 The EISA bus provided some of the features of the IBM MicroChannel
1846 bus while maintaining backward compatibility with cards made for
1847 the older ISA bus. The EISA bus saw limited use between 1988 and
1848 1995 when it was made obsolete by the PCI bus.
1849
1850 Say Y here if you are building a kernel for an EISA-based machine.
1851
1852 Otherwise, say N.
1853
1854source "drivers/eisa/Kconfig"
1855
1856config MCA
Ingo Molnar72ee6eb2009-01-27 16:57:49 +01001857 bool "MCA support"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001858 help
1859 MicroChannel Architecture is found in some IBM PS/2 machines and
1860 laptops. It is a bus system similar to PCI or ISA. See
1861 <file:Documentation/mca.txt> (and especially the web page given
1862 there) before attempting to build an MCA bus kernel.
1863
1864source "drivers/mca/Kconfig"
1865
1866config SCx200
1867 tristate "NatSemi SCx200 support"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001868 help
1869 This provides basic support for National Semiconductor's
1870 (now AMD's) Geode processors. The driver probes for the
1871 PCI-IDs of several on-chip devices, so its a good dependency
1872 for other scx200_* drivers.
1873
1874 If compiled as a module, the driver is named scx200.
1875
1876config SCx200HR_TIMER
1877 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
1878 depends on SCx200 && GENERIC_TIME
1879 default y
1880 help
1881 This driver provides a clocksource built upon the on-chip
1882 27MHz high-resolution timer. Its also a workaround for
1883 NSC Geode SC-1100's buggy TSC, which loses time when the
1884 processor goes idle (as is done by the scheduler). The
1885 other workaround is idle=poll boot option.
1886
1887config GEODE_MFGPT_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001888 def_bool y
1889 prompt "Geode Multi-Function General Purpose Timer (MFGPT) events"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001890 depends on MGEODE_LX && GENERIC_TIME && GENERIC_CLOCKEVENTS
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001891 help
1892 This driver provides a clock event source based on the MFGPT
1893 timer(s) in the CS5535 and CS5536 companion chip for the geode.
1894 MFGPTs have a better resolution and max interval than the
1895 generic PIT, and are suitable for use as high-res timers.
1896
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001897config OLPC
1898 bool "One Laptop Per Child support"
1899 default n
1900 help
1901 Add support for detecting the unique features of the OLPC
1902 XO hardware.
1903
Sam Ravnborgbc0120f2007-11-06 23:10:39 +01001904endif # X86_32
1905
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001906config K8_NB
1907 def_bool y
Sam Ravnborgbc0120f2007-11-06 23:10:39 +01001908 depends on AGP_AMD64 || (X86_64 && (GART_IOMMU || (PCI && NUMA)))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001909
1910source "drivers/pcmcia/Kconfig"
1911
1912source "drivers/pci/hotplug/Kconfig"
1913
1914endmenu
1915
1916
1917menu "Executable file formats / Emulations"
1918
1919source "fs/Kconfig.binfmt"
1920
1921config IA32_EMULATION
1922 bool "IA32 Emulation"
1923 depends on X86_64
Roland McGratha97f52e2008-01-30 13:31:55 +01001924 select COMPAT_BINFMT_ELF
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001925 help
1926 Include code to run 32-bit programs under a 64-bit kernel. You should
1927 likely turn this on, unless you're 100% sure that you don't have any
1928 32-bit programs left.
1929
1930config IA32_AOUT
1931 tristate "IA32 a.out support"
David Woodhouse6b213e12008-06-16 12:39:13 +01001932 depends on IA32_EMULATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001933 help
1934 Support old a.out binaries in the 32bit emulation.
1935
1936config COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001937 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001938 depends on IA32_EMULATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001939
1940config COMPAT_FOR_U64_ALIGNMENT
1941 def_bool COMPAT
1942 depends on X86_64
1943
1944config SYSVIPC_COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001945 def_bool y
Alexey Dobriyanb8992192008-09-14 13:44:41 +04001946 depends on COMPAT && SYSVIPC
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001947
1948endmenu
1949
1950
Keith Packarde5beae12008-11-03 18:21:45 +01001951config HAVE_ATOMIC_IOMAP
1952 def_bool y
1953 depends on X86_32
1954
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001955source "net/Kconfig"
1956
1957source "drivers/Kconfig"
1958
1959source "drivers/firmware/Kconfig"
1960
1961source "fs/Kconfig"
1962
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001963source "arch/x86/Kconfig.debug"
1964
1965source "security/Kconfig"
1966
1967source "crypto/Kconfig"
1968
Avi Kivityedf88412007-12-16 11:02:48 +02001969source "arch/x86/kvm/Kconfig"
1970
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001971source "lib/Kconfig"