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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
Ingo Molnara5574cf2008-05-05 23:19:50 +020022 select HAVE_UNSTABLE_SCHED_CLOCK
Sam Ravnborgec7748b2008-02-09 10:46:40 +010023 select HAVE_IDE
Mathieu Desnoyers42d4b832008-02-02 15:10:34 -050024 select HAVE_OPROFILE
Rik van Riel28b2ee22008-07-23 21:27:05 -070025 select HAVE_IOREMAP_PROT
Mathieu Desnoyers3f550092008-02-02 15:10:35 -050026 select HAVE_KPROBES
Ingo Molnar1f972762008-07-26 13:52:50 +020027 select ARCH_WANT_OPTIONAL_GPIOLIB
Ananth N Mavinakayanahalli9edddaa2008-03-04 14:28:37 -080028 select HAVE_KRETPROBES
Steven Rostedte4b2b882008-08-14 15:45:11 -040029 select HAVE_FTRACE_MCOUNT_RECORD
Steven Rostedt677aa9f2008-05-17 00:01:36 -040030 select HAVE_DYNAMIC_FTRACE
Steven Rostedt606576c2008-10-06 19:06:12 -040031 select HAVE_FUNCTION_TRACER
Randy Dunlap1a4e3f82008-02-20 09:20:08 -080032 select HAVE_KVM if ((X86_32 && !X86_VOYAGER && !X86_VISWS && !X86_NUMAQ) || X86_64)
Ingo Molnarfcbc04c2008-04-21 13:39:53 +020033 select HAVE_ARCH_KGDB if !X86_VOYAGER
Roland McGrath99bbc4b2008-04-20 14:35:12 -070034 select HAVE_ARCH_TRACEHOOK
Dmitry Baryshkov323ec002008-06-29 14:19:31 +040035 select HAVE_GENERIC_DMA_COHERENT if X86_32
Johannes Berg58340a02008-07-25 01:45:33 -070036 select HAVE_EFFICIENT_UNALIGNED_ACCESS
Balbir Singh7d8330a2008-02-10 12:46:28 +053037
Sam Ravnborg73531902008-05-25 23:03:18 +020038config ARCH_DEFCONFIG
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +020039 string
Sam Ravnborg73531902008-05-25 23:03:18 +020040 default "arch/x86/configs/i386_defconfig" if X86_32
41 default "arch/x86/configs/x86_64_defconfig" if X86_64
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +020042
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010043config GENERIC_TIME
Harvey Harrison3c2362e2008-01-30 13:31:03 +010044 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010045
46config GENERIC_CMOS_UPDATE
Harvey Harrison3c2362e2008-01-30 13:31:03 +010047 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010048
49config CLOCKSOURCE_WATCHDOG
Harvey Harrison3c2362e2008-01-30 13:31:03 +010050 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010051
52config GENERIC_CLOCKEVENTS
Harvey Harrison3c2362e2008-01-30 13:31:03 +010053 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010054
55config GENERIC_CLOCKEVENTS_BROADCAST
Harvey Harrison3c2362e2008-01-30 13:31:03 +010056 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010057 depends on X86_64 || (X86_32 && X86_LOCAL_APIC)
58
59config LOCKDEP_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +010060 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010061
62config STACKTRACE_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +010063 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010064
Heiko Carstensaa7d9352008-02-01 17:45:14 +010065config HAVE_LATENCYTOP_SUPPORT
66 def_bool y
67
Christoph Lameter1f842602008-01-07 23:20:30 -080068config FAST_CMPXCHG_LOCAL
69 bool
70 default y
71
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010072config MMU
Harvey Harrison3c2362e2008-01-30 13:31:03 +010073 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010074
75config ZONE_DMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +010076 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010077
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010078config SBUS
79 bool
80
81config GENERIC_ISA_DMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +010082 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010083
84config GENERIC_IOMAP
Harvey Harrison3c2362e2008-01-30 13:31:03 +010085 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010086
87config GENERIC_BUG
Harvey Harrison3c2362e2008-01-30 13:31:03 +010088 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010089 depends on BUG
90
91config GENERIC_HWEIGHT
Harvey Harrison3c2362e2008-01-30 13:31:03 +010092 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010093
Florian Fainellia6082952008-01-30 13:33:35 +010094config GENERIC_GPIO
Jan Beulich9ba16082008-10-15 22:01:38 -070095 bool
Florian Fainellia6082952008-01-30 13:33:35 +010096
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010097config ARCH_MAY_HAVE_PC_FDC
Harvey Harrison3c2362e2008-01-30 13:31:03 +010098 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010099
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100100config RWSEM_GENERIC_SPINLOCK
101 def_bool !X86_XADD
102
103config RWSEM_XCHGADD_ALGORITHM
104 def_bool X86_XADD
105
Venki Pallipadia6869cc2008-02-08 17:05:44 -0800106config ARCH_HAS_CPU_IDLE_WAIT
107 def_bool y
108
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100109config GENERIC_CALIBRATE_DELAY
110 def_bool y
111
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100112config GENERIC_TIME_VSYSCALL
113 bool
114 default X86_64
115
venkatesh.pallipadi@intel.com9a0b8412008-01-31 17:35:06 -0800116config ARCH_HAS_CPU_RELAX
117 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100118
Venkatesh Pallipadi89cedfe2008-10-16 19:00:08 -0400119config ARCH_HAS_DEFAULT_IDLE
120 def_bool y
121
Pekka Enberg1b27d052008-04-28 02:12:22 -0700122config ARCH_HAS_CACHE_LINE_SIZE
123 def_bool y
124
Mike Travisdd5af902008-01-30 13:33:32 +0100125config HAVE_SETUP_PER_CPU_AREA
Mike Travis23ca4bb2008-05-12 21:21:12 +0200126 def_bool X86_64_SMP || (X86_SMP && !X86_VOYAGER)
travis@sgi.comb32ef632008-01-30 13:32:51 +0100127
Mike Travis9f0e8d02008-04-04 18:11:01 -0700128config HAVE_CPUMASK_OF_CPU_MAP
129 def_bool X86_64_SMP
130
Johannes Berg801e4062007-12-08 02:12:39 +0100131config ARCH_HIBERNATION_POSSIBLE
132 def_bool y
133 depends on !SMP || !X86_VOYAGER
134
Johannes Bergf4cb5702007-12-08 02:14:00 +0100135config ARCH_SUSPEND_POSSIBLE
136 def_bool y
137 depends on !X86_VOYAGER
138
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100139config ZONE_DMA32
140 bool
141 default X86_64
142
143config ARCH_POPULATES_NODE_MAP
144 def_bool y
145
146config AUDIT_ARCH
147 bool
148 default X86_64
149
Ingo Molnar765c68b2008-04-09 11:03:37 +0200150config ARCH_SUPPORTS_OPTIMIZED_INLINING
151 def_bool y
152
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100153# Use the generic interrupt handling code in kernel/irq/:
154config GENERIC_HARDIRQS
155 bool
156 default y
157
158config GENERIC_IRQ_PROBE
159 bool
160 default y
161
162config GENERIC_PENDING_IRQ
163 bool
164 depends on GENERIC_HARDIRQS && SMP
165 default y
166
167config X86_SMP
168 bool
Sam Ravnborg6b0c3d42008-01-30 13:32:27 +0100169 depends on SMP && ((X86_32 && !X86_VOYAGER) || X86_64)
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100170 default y
171
James Bottomley6cd10f82008-11-09 11:53:14 -0600172config USE_GENERIC_SMP_HELPERS
173 def_bool y
174 depends on SMP
175
Sam Ravnborg6b0c3d42008-01-30 13:32:27 +0100176config X86_32_SMP
177 def_bool y
178 depends on X86_32 && SMP
179
180config X86_64_SMP
181 def_bool y
182 depends on X86_64 && SMP
183
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100184config X86_HT
185 bool
Adrian Bunkee0011a2007-12-04 17:19:07 +0100186 depends on SMP
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200187 depends on (X86_32 && !X86_VOYAGER) || X86_64
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100188 default y
189
190config X86_BIOS_REBOOT
191 bool
Ingo Molnar31ac4092008-07-10 13:31:04 +0200192 depends on !X86_VOYAGER
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100193 default y
194
195config X86_TRAMPOLINE
196 bool
Pavel Macheke44b7b72008-04-10 23:28:10 +0200197 depends on X86_SMP || (X86_VOYAGER && SMP) || (64BIT && ACPI_SLEEP)
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100198 default y
199
200config KTIME_SCALAR
201 def_bool X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100202source "init/Kconfig"
Matt Helsleydc52ddc2008-10-18 20:27:21 -0700203source "kernel/Kconfig.freezer"
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100204
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100205menu "Processor type and features"
206
207source "kernel/time/Kconfig"
208
209config SMP
210 bool "Symmetric multi-processing support"
211 ---help---
212 This enables support for systems with more than one CPU. If you have
213 a system with only one CPU, like most personal computers, say N. If
214 you have a system with more than one CPU, say Y.
215
216 If you say N here, the kernel will run on single and multiprocessor
217 machines, but will use only one CPU of a multiprocessor machine. If
218 you say Y here, the kernel will run on many, but not all,
219 singleprocessor machines. On a singleprocessor machine, the kernel
220 will run faster if you say N here.
221
222 Note that if you say Y here and choose architecture "586" or
223 "Pentium" under "Processor family", the kernel will not work on 486
224 architectures. Similarly, multiprocessor kernels for the "PPro"
225 architecture may not work on all Pentium based boards.
226
227 People using multiprocessor machines who say Y here should also say
228 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
229 Management" code will be disabled if you say Y here.
230
Adrian Bunk03502fa2008-02-03 15:50:21 +0200231 See also <file:Documentation/i386/IO-APIC.txt>,
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100232 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
233 <http://www.tldp.org/docs.html#howto>.
234
235 If you don't know what to do here, say N.
236
James Bottomleyb3572e32008-10-30 16:00:59 -0500237config X86_HAS_BOOT_CPU_ID
238 def_bool y
239 depends on X86_VOYAGER
240
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800241config SPARSE_IRQ
242 bool "Support sparse irq numbering"
Yinghai Lu8a4830f2008-12-09 11:56:20 -0800243 depends on (PCI_MSI || HT_IRQ) && SMP
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800244 default y
245 help
246 This enables support for sparse irq, esp for msi/msi-x. You may need
247 if you have lots of cards supports msi-x installed.
248
249 If you don't know what to do here, say Y.
250
Yinghai Lu48a1b102008-12-11 00:15:01 -0800251config NUMA_MIGRATE_IRQ_DESC
252 bool "Move irq desc when changing irq smp_affinity"
253 depends on SPARSE_IRQ && SMP
254 default n
255 help
256 This enables moving irq_desc to cpu/node that irq will use handled.
257
258 If you don't know what to do here, say N.
259
Yinghai Lu6695c852008-06-19 12:13:09 -0700260config X86_FIND_SMP_CONFIG
261 def_bool y
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200262 depends on X86_MPPARSE || X86_VOYAGER
Yinghai Lu6695c852008-06-19 12:13:09 -0700263
264if ACPI
265config X86_MPPARSE
266 def_bool y
267 bool "Enable MPS table"
Ingo Molnar5ab74722008-07-10 14:42:03 +0200268 depends on X86_LOCAL_APIC
Yinghai Lu6695c852008-06-19 12:13:09 -0700269 help
270 For old smp systems that do not have proper acpi support. Newer systems
271 (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
272endif
273
274if !ACPI
275config X86_MPPARSE
276 def_bool y
Ingo Molnar5ab74722008-07-10 14:42:03 +0200277 depends on X86_LOCAL_APIC
Yinghai Lu6695c852008-06-19 12:13:09 -0700278endif
279
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100280choice
281 prompt "Subarchitecture Type"
282 default X86_PC
283
284config X86_PC
285 bool "PC-compatible"
286 help
287 Choose this option if your computer is a standard PC or compatible.
288
289config X86_ELAN
290 bool "AMD Elan"
291 depends on X86_32
292 help
293 Select this for an AMD Elan processor.
294
295 Do not use this option for K6/Athlon/Opteron processors!
296
297 If unsure, choose "PC-compatible" instead.
298
299config X86_VOYAGER
300 bool "Voyager (NCR)"
Ingo Molnar1ac97012008-05-19 14:10:14 +0200301 depends on X86_32 && (SMP || BROKEN) && !PCI
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100302 help
303 Voyager is an MCA-based 32-way capable SMP architecture proprietary
304 to NCR Corp. Machine classes 345x/35xx/4100/51xx are Voyager-based.
305
306 *** WARNING ***
307
308 If you do not specifically know you have a Voyager based machine,
309 say N here, otherwise the kernel you build will not be bootable.
310
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100311config X86_GENERICARCH
Yinghai Lud49c4282008-06-08 18:31:54 -0700312 bool "Generic architecture"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100313 depends on X86_32
314 help
Yinghai Lud49c4282008-06-08 18:31:54 -0700315 This option compiles in the NUMAQ, Summit, bigsmp, ES7000, default
316 subarchitectures. It is intended for a generic binary kernel.
317 if you select them all, kernel will probe it one by one. and will
318 fallback to default.
319
320if X86_GENERICARCH
321
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100322config X86_NUMAQ
323 bool "NUMAQ (IBM/Sequent)"
Ingo Molnar3de352b2008-07-08 11:14:58 +0200324 depends on SMP && X86_32 && PCI && X86_MPPARSE
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100325 select NUMA
326 help
Yinghai Lud49c4282008-06-08 18:31:54 -0700327 This option is used for getting Linux to run on a NUMAQ (IBM/Sequent)
328 NUMA multiquad box. This changes the way that processors are
329 bootstrapped, and uses Clustered Logical APIC addressing mode instead
330 of Flat Logical. You will need a new lynxer.elf file to flash your
331 firmware with - send email to <Martin.Bligh@us.ibm.com>.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100332
333config X86_SUMMIT
334 bool "Summit/EXA (IBM x440)"
335 depends on X86_32 && SMP
336 help
337 This option is needed for IBM systems that use the Summit/EXA chipset.
338 In particular, it is needed for the x440.
339
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100340config X86_ES7000
341 bool "Support for Unisys ES7000 IA32 series"
342 depends on X86_32 && SMP
343 help
344 Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
345 supposed to run on an IA32-based Unisys ES7000 system.
Yinghai Lud49c4282008-06-08 18:31:54 -0700346
347config X86_BIGSMP
348 bool "Support for big SMP systems with more than 8 CPUs"
349 depends on X86_32 && SMP
350 help
351 This option is needed for the systems that have more than 8 CPUs
352 and if the system is not of any sub-arch type above.
353
354endif
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100355
356config X86_VSMP
357 bool "Support for ScaleMP vSMP"
Glauber Costa96597fd2008-02-11 17:16:04 -0200358 select PARAVIRT
Ingo Molnara6784ad2008-07-10 12:21:58 +0200359 depends on X86_64 && PCI
Glauber Costa96597fd2008-02-11 17:16:04 -0200360 help
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100361 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
362 supposed to run on these EM64T-based machines. Only choose this option
363 if you have one of these machines.
364
365endchoice
366
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200367config X86_VISWS
368 bool "SGI 320/540 (Visual Workstation)"
Ingo Molnar39415a42008-07-10 20:06:30 +0200369 depends on X86_32 && PCI && !X86_VOYAGER && X86_MPPARSE && PCI_GODIRECT
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200370 help
371 The SGI Visual Workstation series is an IA32-based workstation
372 based on SGI systems chips with some legacy PC hardware attached.
373
374 Say Y here to create a kernel to run on the SGI 320 or 540.
375
376 A kernel compiled for the Visual Workstation will run on general
377 PCs as well. See <file:Documentation/sgi-visws.txt> for details.
378
Ingo Molnar1f972762008-07-26 13:52:50 +0200379config X86_RDC321X
380 bool "RDC R-321x SoC"
381 depends on X86_32
382 select M486
383 select X86_REBOOTFIXUPS
384 help
385 This option is needed for RDC R-321x system-on-chip, also known
386 as R-8610-(G).
387 If you don't have one of these chips, you should say N here.
388
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100389config SCHED_NO_NO_OMIT_FRAME_POINTER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100390 def_bool y
391 prompt "Single-depth WCHAN output"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100392 depends on X86_32
393 help
394 Calculate simpler /proc/<PID>/wchan values. If this option
395 is disabled then wchan values will recurse back to the
396 caller function. This provides more accurate wchan values,
397 at the expense of slightly more scheduling overhead.
398
399 If in doubt, say "Y".
400
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100401menuconfig PARAVIRT_GUEST
402 bool "Paravirtualized guest support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100403 help
404 Say Y here to get to see options related to running Linux under
405 various hypervisors. This option alone does not add any kernel code.
406
407 If you say N, all options in this submenu will be skipped and disabled.
408
409if PARAVIRT_GUEST
410
411source "arch/x86/xen/Kconfig"
412
413config VMI
414 bool "VMI Guest support"
415 select PARAVIRT
Eduardo Pereira Habkost42d545c2008-01-30 13:33:32 +0100416 depends on X86_32
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200417 depends on !X86_VOYAGER
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
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200428 depends on !X86_VOYAGER
Glauber de Oliveira Costa790c73f2008-02-15 17:52:48 -0200429 help
430 Turning on this option will allow you to run a paravirtualized clock
431 when running over the KVM hypervisor. Instead of relying on a PIT
432 (or probably other) emulation by the underlying device model, the host
433 provides the guest with timing infrastructure such as time of day, and
434 system time
435
Marcelo Tosatti0cf1bfd2008-02-22 12:21:36 -0500436config KVM_GUEST
437 bool "KVM Guest support"
438 select PARAVIRT
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200439 depends on !X86_VOYAGER
Marcelo Tosatti0cf1bfd2008-02-22 12:21:36 -0500440 help
441 This option enables various optimizations for running under the KVM
442 hypervisor.
443
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100444source "arch/x86/lguest/Kconfig"
445
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100446config PARAVIRT
447 bool "Enable paravirtualization code"
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200448 depends on !X86_VOYAGER
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100449 help
450 This changes the kernel so it can modify itself when it is run
451 under a hypervisor, potentially improving performance significantly
452 over full virtualization. However, when run without a hypervisor
453 the kernel is theoretically slower and slightly larger.
454
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200455config PARAVIRT_CLOCK
456 bool
457 default n
458
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100459endif
460
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400461config PARAVIRT_DEBUG
462 bool "paravirt-ops debugging"
463 depends on PARAVIRT && DEBUG_KERNEL
464 help
465 Enable to debug paravirt_ops internals. Specifically, BUG if
466 a paravirt_op is missing when it is called.
467
Yinghai Lu03273182008-04-18 17:49:15 -0700468config MEMTEST
469 bool "Memtest"
Yinghai Luc64df702008-03-21 18:56:19 -0700470 help
471 This option adds a kernel parameter 'memtest', which allows memtest
Yinghai Lu03273182008-04-18 17:49:15 -0700472 to be set.
473 memtest=0, mean disabled; -- default
474 memtest=1, mean do 1 test pattern;
475 ...
476 memtest=4, mean do 4 test patterns.
Thomas Gleixneraba37282008-07-15 14:48:48 +0200477 If you are unsure how to answer this question, answer N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100478
479config X86_SUMMIT_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100480 def_bool y
Yinghai Lu0699eae2008-06-17 15:39:01 -0700481 depends on X86_32 && NUMA && X86_GENERICARCH
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100482
483config X86_CYCLONE_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100484 def_bool y
Yinghai Lu0699eae2008-06-17 15:39:01 -0700485 depends on X86_GENERICARCH
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100486
487config ES7000_CLUSTERED_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100488 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100489 depends on SMP && X86_ES7000 && MPENTIUMIII
490
491source "arch/x86/Kconfig.cpu"
492
493config HPET_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100494 def_bool X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100495 prompt "HPET Timer Support" if X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100496 help
497 Use the IA-PC HPET (High Precision Event Timer) to manage
498 time in preference to the PIT and RTC, if a HPET is
499 present.
500 HPET is the next generation timer replacing legacy 8254s.
501 The HPET provides a stable time base on SMP
502 systems, unlike the TSC, but it is more expensive to access,
503 as it is off-chip. You can find the HPET spec at
504 <http://www.intel.com/hardwaredesign/hpetspec.htm>.
505
506 You can safely choose Y here. However, HPET will only be
507 activated if the platform and the BIOS support this feature.
508 Otherwise the 8254 will be used for timing services.
509
510 Choose N to continue using the legacy 8254 timer.
511
512config HPET_EMULATE_RTC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100513 def_bool y
Bernhard Walle9d8af782008-02-06 01:38:52 -0800514 depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100515
516# Mark as embedded because too many people got it wrong.
517# The code disables itself when not needed.
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700518config DMI
519 default y
520 bool "Enable DMI scanning" if EMBEDDED
521 help
522 Enabled scanning of DMI to identify machine quirks. Say Y
523 here unless you have verified that your setup is not
524 affected by entries in the DMI blacklist. Required by PNP
525 BIOS code.
526
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100527config GART_IOMMU
528 bool "GART IOMMU support" if EMBEDDED
529 default y
530 select SWIOTLB
531 select AGP
532 depends on X86_64 && PCI
533 help
534 Support for full DMA access of devices with 32bit memory access only
535 on systems with more than 3GB. This is usually needed for USB,
536 sound, many IDE/SATA chipsets and some other devices.
537 Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
538 based hardware IOMMU and a software bounce buffer based IOMMU used
539 on Intel systems and as fallback.
540 The code is only active when needed (enough memory and limited
541 device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
542 too.
543
544config CALGARY_IOMMU
545 bool "IBM Calgary IOMMU support"
546 select SWIOTLB
547 depends on X86_64 && PCI && EXPERIMENTAL
548 help
549 Support for hardware IOMMUs in IBM's xSeries x366 and x460
550 systems. Needed to run systems with more than 3GB of memory
551 properly with 32-bit PCI devices that do not support DAC
552 (Double Address Cycle). Calgary also supports bus level
553 isolation, where all DMAs pass through the IOMMU. This
554 prevents them from going anywhere except their intended
555 destination. This catches hard-to-find kernel bugs and
556 mis-behaving drivers and devices that do not use the DMA-API
557 properly to set up their DMA buffers. The IOMMU can be
558 turned off at boot time with the iommu=off parameter.
559 Normally the kernel will make the right choice by itself.
560 If unsure, say Y.
561
562config CALGARY_IOMMU_ENABLED_BY_DEFAULT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100563 def_bool y
564 prompt "Should Calgary be enabled by default?"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100565 depends on CALGARY_IOMMU
566 help
567 Should Calgary be enabled by default? if you choose 'y', Calgary
568 will be used (if it exists). If you choose 'n', Calgary will not be
569 used even if it exists. If you choose 'n' and would like to use
570 Calgary anyway, pass 'iommu=calgary' on the kernel command line.
571 If unsure, say Y.
572
Joerg Roedel2b188722008-06-26 21:27:37 +0200573config AMD_IOMMU
574 bool "AMD IOMMU support"
Ingo Molnar07c40e82008-06-27 11:31:28 +0200575 select SWIOTLB
Joerg Roedela80dc3e2008-09-11 16:51:41 +0200576 select PCI_MSI
Ingo Molnar24d2ba02008-06-27 10:37:03 +0200577 depends on X86_64 && PCI && ACPI
Joerg Roedel2b188722008-06-26 21:27:37 +0200578 help
Joerg Roedel18d22202008-07-03 19:35:06 +0200579 With this option you can enable support for AMD IOMMU hardware in
580 your system. An IOMMU is a hardware component which provides
581 remapping of DMA memory accesses from devices. With an AMD IOMMU you
582 can isolate the the DMA memory of different devices and protect the
583 system from misbehaving device drivers or hardware.
584
585 You can find out if your system has an AMD IOMMU if you look into
586 your BIOS for an option to enable it or if you have an IVRS ACPI
587 table.
Joerg Roedel2b188722008-06-26 21:27:37 +0200588
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100589# need this always selected by IOMMU for the VIA workaround
590config SWIOTLB
591 bool
592 help
593 Support for software bounce buffers used on x86-64 systems
594 which don't have a hardware IOMMU (e.g. the current generation
595 of Intel's x86-64 CPUs). Using this PCI devices which can only
596 access 32-bits of memory can be used on systems with more than
597 3 GB of memory. If unsure, say Y.
598
FUJITA Tomonoria8522502008-04-29 00:59:36 -0700599config IOMMU_HELPER
FUJITA Tomonori18b743d2008-07-10 09:50:50 +0900600 def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU)
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700601
Mike Travis1184dc22008-05-12 21:21:12 +0200602config MAXSMP
603 bool "Configure Maximum number of SMP Processors and NUMA Nodes"
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700604 depends on X86_64 && SMP && BROKEN
Mike Travis1184dc22008-05-12 21:21:12 +0200605 default n
606 help
607 Configure maximum number of CPUS and NUMA Nodes for this architecture.
608 If unsure, say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100609
610config NR_CPUS
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700611 int "Maximum number of CPUs (2-512)" if !MAXSMP
612 range 2 512
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100613 depends on SMP
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700614 default "4096" if MAXSMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100615 default "32" if X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000
616 default "8"
617 help
618 This allows you to specify the maximum number of CPUs which this
Linus Torvaldsd25e26b2008-08-25 14:15:38 -0700619 kernel will support. The maximum supported value is 512 and the
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100620 minimum value which makes sense is 2.
621
622 This is purely to save memory - each supported CPU adds
623 approximately eight kilobytes to the kernel image.
624
625config SCHED_SMT
626 bool "SMT (Hyperthreading) scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800627 depends on X86_HT
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100628 help
629 SMT scheduler support improves the CPU scheduler's decision making
630 when dealing with Intel Pentium 4 chips with HyperThreading at a
631 cost of slightly increased overhead in some places. If unsure say
632 N here.
633
634config SCHED_MC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100635 def_bool y
636 prompt "Multi-core scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800637 depends on X86_HT
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100638 help
639 Multi-core scheduler support improves the CPU scheduler's decision
640 making when dealing with multi-core CPU chips at a cost of slightly
641 increased overhead in some places. If unsure say N here.
642
643source "kernel/Kconfig.preempt"
644
645config X86_UP_APIC
646 bool "Local APIC support on uniprocessors"
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200647 depends on X86_32 && !SMP && !(X86_VOYAGER || X86_GENERICARCH)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100648 help
649 A local APIC (Advanced Programmable Interrupt Controller) is an
650 integrated interrupt controller in the CPU. If you have a single-CPU
651 system which has a processor with a local APIC, you can say Y here to
652 enable and use it. If you say Y here even though your machine doesn't
653 have a local APIC, then the kernel will still run with no slowdown at
654 all. The local APIC supports CPU-generated self-interrupts (timer,
655 performance counters), and the NMI watchdog which detects hard
656 lockups.
657
658config X86_UP_IOAPIC
659 bool "IO-APIC support on uniprocessors"
660 depends on X86_UP_APIC
661 help
662 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
663 SMP-capable replacement for PC-style interrupt controllers. Most
664 SMP systems and many recent uniprocessor systems have one.
665
666 If you have a single-CPU system with an IO-APIC, you can say Y here
667 to use it. If you say Y here even though your machine doesn't have
668 an IO-APIC, then the kernel will still run with no slowdown at all.
669
670config X86_LOCAL_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100671 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200672 depends on X86_64 || (X86_32 && (X86_UP_APIC || (SMP && !X86_VOYAGER) || X86_GENERICARCH))
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100673
674config X86_IO_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100675 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200676 depends on X86_64 || (X86_32 && (X86_UP_IOAPIC || (SMP && !X86_VOYAGER) || X86_GENERICARCH))
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100677
678config X86_VISWS_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100679 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100680 depends on X86_32 && X86_VISWS
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100681
682config X86_MCE
683 bool "Machine Check Exception"
684 depends on !X86_VOYAGER
685 ---help---
686 Machine Check Exception support allows the processor to notify the
687 kernel if it detects a problem (e.g. overheating, component failure).
688 The action the kernel takes depends on the severity of the problem,
689 ranging from a warning message on the console, to halting the machine.
690 Your processor must be a Pentium or newer to support this - check the
691 flags in /proc/cpuinfo for mce. Note that some older Pentium systems
692 have a design flaw which leads to false MCE events - hence MCE is
693 disabled on all P5 processors, unless explicitly enabled with "mce"
694 as a boot argument. Similarly, if MCE is built in and creates a
695 problem on some new non-standard machine, you can boot with "nomce"
696 to disable it. MCE support simply ignores non-MCE processors like
697 the 386 and 486, so nearly everyone can say Y here.
698
699config X86_MCE_INTEL
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100700 def_bool y
701 prompt "Intel MCE features"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100702 depends on X86_64 && X86_MCE && X86_LOCAL_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100703 help
704 Additional support for intel specific MCE features such as
705 the thermal monitor.
706
707config X86_MCE_AMD
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100708 def_bool y
709 prompt "AMD MCE features"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100710 depends on X86_64 && X86_MCE && X86_LOCAL_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100711 help
712 Additional support for AMD specific MCE features such as
713 the DRAM Error Threshold.
714
715config X86_MCE_NONFATAL
716 tristate "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4"
717 depends on X86_32 && X86_MCE
718 help
719 Enabling this feature starts a timer that triggers every 5 seconds which
720 will look at the machine check registers to see if anything happened.
721 Non-fatal problems automatically get corrected (but still logged).
722 Disable this if you don't want to see these messages.
723 Seeing the messages this option prints out may be indicative of dying
724 or out-of-spec (ie, overclocked) hardware.
725 This option only does something on certain CPUs.
726 (AMD Athlon/Duron and Intel Pentium 4)
727
728config X86_MCE_P4THERMAL
729 bool "check for P4 thermal throttling interrupt."
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200730 depends on X86_32 && X86_MCE && (X86_UP_APIC || SMP)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100731 help
732 Enabling this feature will cause a message to be printed when the P4
733 enters thermal throttling.
734
735config VM86
736 bool "Enable VM86 support" if EMBEDDED
737 default y
738 depends on X86_32
739 help
740 This option is required by programs like DOSEMU to run 16-bit legacy
741 code on X86 processors. It also may be needed by software like
742 XFree86 to initialize some video cards via BIOS. Disabling this
743 option saves about 6k.
744
745config TOSHIBA
746 tristate "Toshiba Laptop support"
747 depends on X86_32
748 ---help---
749 This adds a driver to safely access the System Management Mode of
750 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
751 not work on models with a Phoenix BIOS. The System Management Mode
752 is used to set the BIOS and power saving options on Toshiba portables.
753
754 For information on utilities to make use of this driver see the
755 Toshiba Linux utilities web site at:
756 <http://www.buzzard.org.uk/toshiba/>.
757
758 Say Y if you intend to run this kernel on a Toshiba portable.
759 Say N otherwise.
760
761config I8K
762 tristate "Dell laptop support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100763 ---help---
764 This adds a driver to safely access the System Management Mode
765 of the CPU on the Dell Inspiron 8000. The System Management Mode
766 is used to read cpu temperature and cooling fan status and to
767 control the fans on the I8K portables.
768
769 This driver has been tested only on the Inspiron 8000 but it may
770 also work with other Dell laptops. You can force loading on other
771 models by passing the parameter `force=1' to the module. Use at
772 your own risk.
773
774 For information on utilities to make use of this driver see the
775 I8K Linux utilities web site at:
776 <http://people.debian.org/~dz/i8k/>
777
778 Say Y if you intend to run this kernel on a Dell Inspiron 8000.
779 Say N otherwise.
780
781config X86_REBOOTFIXUPS
Jan Beulich9ba16082008-10-15 22:01:38 -0700782 bool "Enable X86 board specific fixups for reboot"
783 depends on X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100784 ---help---
785 This enables chipset and/or board specific fixups to be done
786 in order to get reboot to work correctly. This is only needed on
787 some combinations of hardware and BIOS. The symptom, for which
788 this config is intended, is when reboot ends with a stalled/hung
789 system.
790
791 Currently, the only fixup is for the Geode machines using
Florian Fainelli5e3a77e2008-01-30 13:33:36 +0100792 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100793
794 Say Y if you want to enable the fixup. Currently, it's safe to
795 enable this option even if you don't need it.
796 Say N otherwise.
797
798config MICROCODE
Peter Oruba8d86f392008-07-28 18:44:21 +0200799 tristate "/dev/cpu/microcode - microcode support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100800 select FW_LOADER
801 ---help---
802 If you say Y here, you will be able to update the microcode on
Peter Oruba80cc9f12008-07-28 18:44:22 +0200803 certain Intel and AMD processors. The Intel support is for the
804 IA32 family, e.g. Pentium Pro, Pentium II, Pentium III,
805 Pentium 4, Xeon etc. The AMD support is for family 0x10 and
806 0x11 processors, e.g. Opteron, Phenom and Turion 64 Ultra.
807 You will obviously need the actual microcode binary data itself
808 which is not shipped with the Linux kernel.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100809
Peter Oruba8d86f392008-07-28 18:44:21 +0200810 This option selects the general module only, you need to select
811 at least one vendor specific module as well.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100812
813 To compile this driver as a module, choose M here: the
814 module will be called microcode.
815
Peter Oruba8d86f392008-07-28 18:44:21 +0200816config MICROCODE_INTEL
Dmitry Adamushko18dbc912008-09-23 12:08:44 +0200817 bool "Intel microcode patch loading support"
Peter Oruba8d86f392008-07-28 18:44:21 +0200818 depends on MICROCODE
819 default MICROCODE
820 select FW_LOADER
821 --help---
822 This options enables microcode patch loading support for Intel
823 processors.
824
825 For latest news and information on obtaining all the required
826 Intel ingredients for this driver, check:
827 <http://www.urbanmyth.org/microcode/>.
828
Peter Oruba80cc9f12008-07-28 18:44:22 +0200829config MICROCODE_AMD
Dmitry Adamushko18dbc912008-09-23 12:08:44 +0200830 bool "AMD microcode patch loading support"
Peter Oruba80cc9f12008-07-28 18:44:22 +0200831 depends on MICROCODE
832 select FW_LOADER
833 --help---
834 If you select this option, microcode patch loading support for AMD
835 processors will be enabled.
836
Peter Oruba8d86f392008-07-28 18:44:21 +0200837 config MICROCODE_OLD_INTERFACE
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100838 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100839 depends on MICROCODE
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100840
841config X86_MSR
842 tristate "/dev/cpu/*/msr - Model-specific register support"
843 help
844 This device gives privileged processes access to the x86
845 Model-Specific Registers (MSRs). It is a character device with
846 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
847 MSR accesses are directed to a specific CPU on multi-processor
848 systems.
849
850config X86_CPUID
851 tristate "/dev/cpu/*/cpuid - CPU information support"
852 help
853 This device gives processes access to the x86 CPUID instruction to
854 be executed on a specific processor. It is a character device
855 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
856 /dev/cpu/31/cpuid.
857
858choice
859 prompt "High Memory Support"
860 default HIGHMEM4G if !X86_NUMAQ
861 default HIGHMEM64G if X86_NUMAQ
862 depends on X86_32
863
864config NOHIGHMEM
865 bool "off"
866 depends on !X86_NUMAQ
867 ---help---
868 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
869 However, the address space of 32-bit x86 processors is only 4
870 Gigabytes large. That means that, if you have a large amount of
871 physical memory, not all of it can be "permanently mapped" by the
872 kernel. The physical memory that's not permanently mapped is called
873 "high memory".
874
875 If you are compiling a kernel which will never run on a machine with
876 more than 1 Gigabyte total physical RAM, answer "off" here (default
877 choice and suitable for most users). This will result in a "3GB/1GB"
878 split: 3GB are mapped so that each process sees a 3GB virtual memory
879 space and the remaining part of the 4GB virtual memory space is used
880 by the kernel to permanently map as much physical memory as
881 possible.
882
883 If the machine has between 1 and 4 Gigabytes physical RAM, then
884 answer "4GB" here.
885
886 If more than 4 Gigabytes is used then answer "64GB" here. This
887 selection turns Intel PAE (Physical Address Extension) mode on.
888 PAE implements 3-level paging on IA32 processors. PAE is fully
889 supported by Linux, PAE mode is implemented on all recent Intel
890 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
891 then the kernel will not boot on CPUs that don't support PAE!
892
893 The actual amount of total physical memory will either be
894 auto detected or can be forced by using a kernel command line option
895 such as "mem=256M". (Try "man bootparam" or see the documentation of
896 your boot loader (lilo or loadlin) about how to pass options to the
897 kernel at boot time.)
898
899 If unsure, say "off".
900
901config HIGHMEM4G
902 bool "4GB"
903 depends on !X86_NUMAQ
904 help
905 Select this if you have a 32-bit processor and between 1 and 4
906 gigabytes of physical RAM.
907
908config HIGHMEM64G
909 bool "64GB"
910 depends on !M386 && !M486
911 select X86_PAE
912 help
913 Select this if you have a 32-bit processor and more than 4
914 gigabytes of physical RAM.
915
916endchoice
917
918choice
919 depends on EXPERIMENTAL
920 prompt "Memory split" if EMBEDDED
921 default VMSPLIT_3G
922 depends on X86_32
923 help
924 Select the desired split between kernel and user memory.
925
926 If the address range available to the kernel is less than the
927 physical memory installed, the remaining memory will be available
928 as "high memory". Accessing high memory is a little more costly
929 than low memory, as it needs to be mapped into the kernel first.
930 Note that increasing the kernel address space limits the range
931 available to user programs, making the address space there
932 tighter. Selecting anything other than the default 3G/1G split
933 will also likely make your kernel incompatible with binary-only
934 kernel modules.
935
936 If you are not absolutely sure what you are doing, leave this
937 option alone!
938
939 config VMSPLIT_3G
940 bool "3G/1G user/kernel split"
941 config VMSPLIT_3G_OPT
942 depends on !X86_PAE
943 bool "3G/1G user/kernel split (for full 1G low memory)"
944 config VMSPLIT_2G
945 bool "2G/2G user/kernel split"
946 config VMSPLIT_2G_OPT
947 depends on !X86_PAE
948 bool "2G/2G user/kernel split (for full 2G low memory)"
949 config VMSPLIT_1G
950 bool "1G/3G user/kernel split"
951endchoice
952
953config PAGE_OFFSET
954 hex
955 default 0xB0000000 if VMSPLIT_3G_OPT
956 default 0x80000000 if VMSPLIT_2G
957 default 0x78000000 if VMSPLIT_2G_OPT
958 default 0x40000000 if VMSPLIT_1G
959 default 0xC0000000
960 depends on X86_32
961
962config HIGHMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100963 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100964 depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100965
966config X86_PAE
Jan Beulich9ba16082008-10-15 22:01:38 -0700967 bool "PAE (Physical Address Extension) Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100968 depends on X86_32 && !HIGHMEM4G
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100969 help
970 PAE is required for NX support, and furthermore enables
971 larger swapspace support for non-overcommit purposes. It
972 has the cost of more pagetable lookup overhead, and also
973 consumes more pagetable space per process.
974
Jeremy Fitzhardinge600715d2008-09-11 01:31:45 -0700975config ARCH_PHYS_ADDR_T_64BIT
976 def_bool X86_64 || X86_PAE
977
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100978# Common NUMA Features
979config NUMA
980 bool "Numa Memory Allocation and Scheduler Support (EXPERIMENTAL)"
981 depends on SMP
Rafael J. Wysocki604d2052008-11-12 23:26:14 +0100982 depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100983 default n if X86_PC
Yinghai Lu0699eae2008-06-17 15:39:01 -0700984 default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100985 help
986 Enable NUMA (Non Uniform Memory Access) support.
987 The kernel will try to allocate memory used by a CPU on the
988 local memory controller of the CPU and add some more
989 NUMA awareness to the kernel.
990
Pavel Machek04b69442008-08-14 17:16:50 +0200991 For 32-bit this is currently highly experimental and should be only
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100992 used for kernel development. It might also cause boot failures.
Pavel Machek04b69442008-08-14 17:16:50 +0200993 For 64-bit this is recommended on all multiprocessor Opteron systems.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100994 If the system is EM64T, you should say N unless your system is
995 EM64T NUMA.
996
997comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
998 depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
999
1000config K8_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001001 def_bool y
1002 prompt "Old style AMD Opteron NUMA detection"
1003 depends on X86_64 && NUMA && PCI
1004 help
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001005 Enable K8 NUMA node topology detection. You should say Y here if
1006 you have a multi processor AMD K8 system. This uses an old
1007 method to read the NUMA configuration directly from the builtin
1008 Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
1009 instead, which also takes priority if both are compiled in.
1010
1011config X86_64_ACPI_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001012 def_bool y
1013 prompt "ACPI NUMA detection"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001014 depends on X86_64 && NUMA && ACPI && PCI
1015 select ACPI_NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001016 help
1017 Enable ACPI SRAT based node topology detection.
1018
Suresh Siddha6ec6e0d2008-03-25 10:14:35 -07001019# Some NUMA nodes have memory ranges that span
1020# other nodes. Even though a pfn is valid and
1021# between a node's start and end pfns, it may not
1022# reside on that node. See memmap_init_zone()
1023# for details.
1024config NODES_SPAN_OTHER_NODES
1025 def_bool y
1026 depends on X86_64_ACPI_NUMA
1027
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001028config NUMA_EMU
1029 bool "NUMA emulation"
1030 depends on X86_64 && NUMA
1031 help
1032 Enable NUMA emulation. A flat machine will be split
1033 into virtual nodes when booted with "numa=fake=N", where N is the
1034 number of nodes. This is only useful for debugging.
1035
1036config NODES_SHIFT
Linus Torvaldsd25e26b2008-08-25 14:15:38 -07001037 int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
Mike Travis1184dc22008-05-12 21:21:12 +02001038 range 1 9 if X86_64
Linus Torvaldsd25e26b2008-08-25 14:15:38 -07001039 default "9" if MAXSMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001040 default "6" if X86_64
1041 default "4" if X86_NUMAQ
1042 default "3"
1043 depends on NEED_MULTIPLE_NODES
Mike Travis1184dc22008-05-12 21:21:12 +02001044 help
1045 Specify the maximum number of NUMA Nodes available on the target
1046 system. Increases memory reserved to accomodate various tables.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001047
1048config HAVE_ARCH_BOOTMEM_NODE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001049 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001050 depends on X86_32 && NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001051
1052config ARCH_HAVE_MEMORY_PRESENT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001053 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001054 depends on X86_32 && DISCONTIGMEM
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001055
1056config NEED_NODE_MEMMAP_SIZE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001057 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001058 depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001059
1060config HAVE_ARCH_ALLOC_REMAP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001061 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001062 depends on X86_32 && NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001063
1064config ARCH_FLATMEM_ENABLE
1065 def_bool y
Jeff Chua99809962008-08-06 19:09:53 +08001066 depends on X86_32 && ARCH_SELECT_MEMORY_MODEL && !NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001067
1068config ARCH_DISCONTIGMEM_ENABLE
1069 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001070 depends on NUMA && X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001071
1072config ARCH_DISCONTIGMEM_DEFAULT
1073 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001074 depends on NUMA && X86_32
1075
1076config ARCH_SPARSEMEM_DEFAULT
1077 def_bool y
1078 depends on X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001079
1080config ARCH_SPARSEMEM_ENABLE
1081 def_bool y
Jeff Chua99809962008-08-06 19:09:53 +08001082 depends on X86_64 || NUMA || (EXPERIMENTAL && X86_PC) || X86_GENERICARCH
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001083 select SPARSEMEM_STATIC if X86_32
1084 select SPARSEMEM_VMEMMAP_ENABLE if X86_64
1085
1086config ARCH_SELECT_MEMORY_MODEL
1087 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001088 depends on ARCH_SPARSEMEM_ENABLE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001089
1090config ARCH_MEMORY_PROBE
1091 def_bool X86_64
1092 depends on MEMORY_HOTPLUG
1093
1094source "mm/Kconfig"
1095
1096config HIGHPTE
1097 bool "Allocate 3rd-level pagetables from highmem"
1098 depends on X86_32 && (HIGHMEM4G || HIGHMEM64G)
1099 help
1100 The VM uses one page table entry for each page of physical memory.
1101 For systems with a lot of RAM, this can be wasteful of precious
1102 low memory. Setting this option will put user-space page table
1103 entries in high memory.
1104
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001105config X86_CHECK_BIOS_CORRUPTION
1106 bool "Check for low memory corruption"
Jeremy Fitzhardinge9f077872008-09-07 01:51:34 -07001107 help
1108 Periodically check for memory corruption in low memory, which
1109 is suspected to be caused by BIOS. Even when enabled in the
1110 configuration, it is disabled at runtime. Enable it by
1111 setting "memory_corruption_check=1" on the kernel command
1112 line. By default it scans the low 64k of memory every 60
1113 seconds; see the memory_corruption_check_size and
1114 memory_corruption_check_period parameters in
1115 Documentation/kernel-parameters.txt to adjust this.
1116
1117 When enabled with the default parameters, this option has
1118 almost no overhead, as it reserves a relatively small amount
1119 of memory and scans it infrequently. It both detects corruption
1120 and prevents it from affecting the running system.
1121
1122 It is, however, intended as a diagnostic tool; if repeatable
1123 BIOS-originated corruption always affects the same memory,
1124 you can use memmap= to prevent the kernel from using that
1125 memory.
1126
Jeremy Fitzhardingec885df52008-09-07 02:37:32 -07001127config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
1128 bool "Set the default setting of memory_corruption_check"
1129 depends on X86_CHECK_BIOS_CORRUPTION
1130 default y
1131 help
1132 Set whether the default state of memory_corruption_check is
1133 on or off.
1134
Ingo Molnarfc381512008-09-16 10:07:34 +02001135config X86_RESERVE_LOW_64K
1136 bool "Reserve low 64K of RAM on AMI/Phoenix BIOSen"
1137 default y
1138 help
1139 Reserve the first 64K of physical RAM on BIOSes that are known
1140 to potentially corrupt that memory range. A numbers of BIOSes are
1141 known to utilize this area during suspend/resume, so it must not
1142 be used by the kernel.
1143
1144 Set this to N if you are absolutely sure that you trust the BIOS
1145 to get all its memory reservations and usages right.
1146
1147 If you have doubts about the BIOS (e.g. suspend/resume does not
1148 work or there's kernel crashes after certain hardware hotplug
1149 events) and it's not AMI or Phoenix, then you might want to enable
1150 X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check typical
1151 corruption patterns.
1152
1153 Say Y if unsure.
1154
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001155config MATH_EMULATION
1156 bool
1157 prompt "Math emulation" if X86_32
1158 ---help---
1159 Linux can emulate a math coprocessor (used for floating point
1160 operations) if you don't have one. 486DX and Pentium processors have
1161 a math coprocessor built in, 486SX and 386 do not, unless you added
1162 a 487DX or 387, respectively. (The messages during boot time can
1163 give you some hints here ["man dmesg"].) Everyone needs either a
1164 coprocessor or this emulation.
1165
1166 If you don't have a math coprocessor, you need to say Y here; if you
1167 say Y here even though you have a coprocessor, the coprocessor will
1168 be used nevertheless. (This behavior can be changed with the kernel
1169 command line option "no387", which comes handy if your coprocessor
1170 is broken. Try "man bootparam" or see the documentation of your boot
1171 loader (lilo or loadlin) about how to pass options to the kernel at
1172 boot time.) This means that it is a good idea to say Y here if you
1173 intend to use this kernel on different machines.
1174
1175 More information about the internals of the Linux math coprocessor
1176 emulation can be found in <file:arch/x86/math-emu/README>.
1177
1178 If you are not sure, say Y; apart from resulting in a 66 KB bigger
1179 kernel, it won't hurt.
1180
1181config MTRR
1182 bool "MTRR (Memory Type Range Register) support"
1183 ---help---
1184 On Intel P6 family processors (Pentium Pro, Pentium II and later)
1185 the Memory Type Range Registers (MTRRs) may be used to control
1186 processor access to memory ranges. This is most useful if you have
1187 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
1188 allows bus write transfers to be combined into a larger transfer
1189 before bursting over the PCI/AGP bus. This can increase performance
1190 of image write operations 2.5 times or more. Saying Y here creates a
1191 /proc/mtrr file which may be used to manipulate your processor's
1192 MTRRs. Typically the X server should use this.
1193
1194 This code has a reasonably generic interface so that similar
1195 control registers on other processors can be easily supported
1196 as well:
1197
1198 The Cyrix 6x86, 6x86MX and M II processors have Address Range
1199 Registers (ARRs) which provide a similar functionality to MTRRs. For
1200 these, the ARRs are used to emulate the MTRRs.
1201 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
1202 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
1203 write-combining. All of these processors are supported by this code
1204 and it makes sense to say Y here if you have one of them.
1205
1206 Saying Y here also fixes a problem with buggy SMP BIOSes which only
1207 set the MTRRs for the boot CPU and not for the secondary CPUs. This
1208 can lead to all sorts of problems, so it's good to say Y here.
1209
1210 You can safely say Y even if your machine doesn't have MTRRs, you'll
1211 just add about 9 KB to your kernel.
1212
Randy Dunlap7225e752008-07-26 17:54:22 -07001213 See <file:Documentation/x86/mtrr.txt> for more information.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001214
Yinghai Lu95ffa242008-04-29 03:52:33 -07001215config MTRR_SANITIZER
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001216 def_bool y
Yinghai Lu95ffa242008-04-29 03:52:33 -07001217 prompt "MTRR cleanup support"
1218 depends on MTRR
1219 help
Thomas Gleixneraba37282008-07-15 14:48:48 +02001220 Convert MTRR layout from continuous to discrete, so X drivers can
1221 add writeback entries.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001222
Thomas Gleixneraba37282008-07-15 14:48:48 +02001223 Can be disabled with disable_mtrr_cleanup on the kernel command line.
1224 The largest mtrr entry size for a continous block can be set with
1225 mtrr_chunk_size.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001226
Yinghai Lu2ffb3502008-09-30 16:29:40 -07001227 If unsure, say Y.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001228
1229config MTRR_SANITIZER_ENABLE_DEFAULT
Yinghai Luf5098d62008-04-29 20:25:58 -07001230 int "MTRR cleanup enable value (0-1)"
1231 range 0 1
1232 default "0"
Yinghai Lu95ffa242008-04-29 03:52:33 -07001233 depends on MTRR_SANITIZER
1234 help
Yinghai Luf5098d62008-04-29 20:25:58 -07001235 Enable mtrr cleanup default value
Yinghai Lu95ffa242008-04-29 03:52:33 -07001236
Yinghai Lu12031a62008-05-02 02:40:22 -07001237config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
1238 int "MTRR cleanup spare reg num (0-7)"
1239 range 0 7
1240 default "1"
1241 depends on MTRR_SANITIZER
1242 help
1243 mtrr cleanup spare entries default, it can be changed via
Thomas Gleixneraba37282008-07-15 14:48:48 +02001244 mtrr_spare_reg_nr=N on the kernel command line.
Yinghai Lu12031a62008-05-02 02:40:22 -07001245
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001246config X86_PAT
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001247 bool
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001248 prompt "x86 PAT support"
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001249 depends on MTRR
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001250 help
1251 Use PAT attributes to setup page level cache control.
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001252
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001253 PATs are the modern equivalents of MTRRs and are much more
1254 flexible than MTRRs.
1255
1256 Say N here if you see bootup problems (boot crash, boot hang,
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001257 spontaneous reboots) or a non-working video driver.
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001258
1259 If unsure, say Y.
1260
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001261config EFI
Jan Beulich9ba16082008-10-15 22:01:38 -07001262 bool "EFI runtime service support"
Huang, Ying5b836832008-01-30 13:31:19 +01001263 depends on ACPI
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001264 ---help---
Huang, Ying8b2cb7a2008-01-30 13:32:11 +01001265 This enables the kernel to use EFI runtime services that are
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001266 available (such as the EFI variable services).
1267
Huang, Ying8b2cb7a2008-01-30 13:32:11 +01001268 This option is only useful on systems that have EFI firmware.
1269 In addition, you should use the latest ELILO loader available
1270 at <http://elilo.sourceforge.net> in order to take advantage
1271 of EFI runtime services. However, even with this option, the
1272 resultant kernel should continue to boot on existing non-EFI
1273 platforms.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001274
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001275config SECCOMP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001276 def_bool y
1277 prompt "Enable seccomp to safely compute untrusted bytecode"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001278 help
1279 This kernel feature is useful for number crunching applications
1280 that may need to compute untrusted bytecode during their
1281 execution. By using pipes or other transports made available to
1282 the process as file descriptors supporting the read/write
1283 syscalls, it's possible to isolate those applications in
1284 their own address space using seccomp. Once seccomp is
Alexey Dobriyan9c0bbee2008-09-09 11:01:31 +04001285 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001286 and the task is only allowed to execute a few safe syscalls
1287 defined by each seccomp mode.
1288
1289 If unsure, say Y. Only embedded should say N here.
1290
1291config CC_STACKPROTECTOR
1292 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
Linus Torvalds2c020a92008-02-22 08:21:38 -08001293 depends on X86_64 && EXPERIMENTAL && BROKEN
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001294 help
1295 This option turns on the -fstack-protector GCC feature. This
1296 feature puts, at the beginning of critical functions, a canary
1297 value on the stack just before the return address, and validates
1298 the value just before actually returning. Stack based buffer
1299 overflows (that need to overwrite this return address) now also
1300 overwrite the canary, which gets detected and the attack is then
1301 neutralized via a kernel panic.
1302
1303 This feature requires gcc version 4.2 or above, or a distribution
1304 gcc with the feature backported. Older versions are automatically
1305 detected and for those versions, this configuration option is ignored.
1306
1307config CC_STACKPROTECTOR_ALL
1308 bool "Use stack-protector for all functions"
1309 depends on CC_STACKPROTECTOR
1310 help
1311 Normally, GCC only inserts the canary value protection for
1312 functions that use large-ish on-stack buffers. By enabling
1313 this option, GCC will be asked to do this for ALL functions.
1314
1315source kernel/Kconfig.hz
1316
1317config KEXEC
1318 bool "kexec system call"
Ingo Molnar3e8f7e32008-04-28 10:46:58 +02001319 depends on X86_BIOS_REBOOT
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001320 help
1321 kexec is a system call that implements the ability to shutdown your
1322 current kernel, and to start another kernel. It is like a reboot
1323 but it is independent of the system firmware. And like a reboot
1324 you can start any kernel with it, not just Linux.
1325
1326 The name comes from the similarity to the exec system call.
1327
1328 It is an ongoing process to be certain the hardware in a machine
1329 is properly shutdown, so do not be surprised if this code does not
1330 initially work for you. It may help to enable device hotplugging
1331 support. As of this writing the exact hardware interface is
1332 strongly in flux, so no good recommendation can be made.
1333
1334config CRASH_DUMP
Pavel Machek04b69442008-08-14 17:16:50 +02001335 bool "kernel crash dumps"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001336 depends on X86_64 || (X86_32 && HIGHMEM)
1337 help
1338 Generate crash dump after being started by kexec.
1339 This should be normally only set in special crash dump kernels
1340 which are loaded in the main kernel with kexec-tools into
1341 a specially reserved region and then later executed after
1342 a crash by kdump/kexec. The crash dump kernel must be compiled
1343 to a memory address not used by the main kernel or BIOS using
1344 PHYSICAL_START, or it must be built as a relocatable image
1345 (CONFIG_RELOCATABLE=y).
1346 For more details see Documentation/kdump/kdump.txt
1347
Huang Ying3ab83522008-07-25 19:45:07 -07001348config KEXEC_JUMP
1349 bool "kexec jump (EXPERIMENTAL)"
1350 depends on EXPERIMENTAL
Huang Ying89081d12008-07-25 19:45:10 -07001351 depends on KEXEC && HIBERNATION && X86_32
Huang Ying3ab83522008-07-25 19:45:07 -07001352 help
Huang Ying89081d12008-07-25 19:45:10 -07001353 Jump between original kernel and kexeced kernel and invoke
1354 code in physical address mode via KEXEC
Huang Ying3ab83522008-07-25 19:45:07 -07001355
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001356config PHYSICAL_START
1357 hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
1358 default "0x1000000" if X86_NUMAQ
1359 default "0x200000" if X86_64
1360 default "0x100000"
1361 help
1362 This gives the physical address where the kernel is loaded.
1363
1364 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
1365 bzImage will decompress itself to above physical address and
1366 run from there. Otherwise, bzImage will run from the address where
1367 it has been loaded by the boot loader and will ignore above physical
1368 address.
1369
1370 In normal kdump cases one does not have to set/change this option
1371 as now bzImage can be compiled as a completely relocatable image
1372 (CONFIG_RELOCATABLE=y) and be used to load and run from a different
1373 address. This option is mainly useful for the folks who don't want
1374 to use a bzImage for capturing the crash dump and want to use a
1375 vmlinux instead. vmlinux is not relocatable hence a kernel needs
1376 to be specifically compiled to run from a specific memory area
1377 (normally a reserved region) and this option comes handy.
1378
1379 So if you are using bzImage for capturing the crash dump, leave
1380 the value here unchanged to 0x100000 and set CONFIG_RELOCATABLE=y.
1381 Otherwise if you plan to use vmlinux for capturing the crash dump
1382 change this value to start of the reserved region (Typically 16MB
1383 0x1000000). In other words, it can be set based on the "X" value as
1384 specified in the "crashkernel=YM@XM" command line boot parameter
1385 passed to the panic-ed kernel. Typically this parameter is set as
1386 crashkernel=64M@16M. Please take a look at
1387 Documentation/kdump/kdump.txt for more details about crash dumps.
1388
1389 Usage of bzImage for capturing the crash dump is recommended as
1390 one does not have to build two kernels. Same kernel can be used
1391 as production kernel and capture kernel. Above option should have
1392 gone away after relocatable bzImage support is introduced. But it
1393 is present because there are users out there who continue to use
1394 vmlinux for dump capture. This option should go away down the
1395 line.
1396
1397 Don't change this unless you know what you are doing.
1398
1399config RELOCATABLE
1400 bool "Build a relocatable kernel (EXPERIMENTAL)"
1401 depends on EXPERIMENTAL
1402 help
1403 This builds a kernel image that retains relocation information
1404 so it can be loaded someplace besides the default 1MB.
1405 The relocations tend to make the kernel binary about 10% larger,
1406 but are discarded at runtime.
1407
1408 One use is for the kexec on panic case where the recovery kernel
1409 must live at a different physical address than the primary
1410 kernel.
1411
1412 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
1413 it has been loaded at and the compile time physical address
1414 (CONFIG_PHYSICAL_START) is ignored.
1415
1416config PHYSICAL_ALIGN
1417 hex
1418 prompt "Alignment value to which kernel should be aligned" if X86_32
1419 default "0x100000" if X86_32
1420 default "0x200000" if X86_64
1421 range 0x2000 0x400000
1422 help
1423 This value puts the alignment restrictions on physical address
1424 where kernel is loaded and run from. Kernel is compiled for an
1425 address which meets above alignment restriction.
1426
1427 If bootloader loads the kernel at a non-aligned address and
1428 CONFIG_RELOCATABLE is set, kernel will move itself to nearest
1429 address aligned to above value and run from there.
1430
1431 If bootloader loads the kernel at a non-aligned address and
1432 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
1433 load address and decompress itself to the address it has been
1434 compiled for and run from there. The address for which kernel is
1435 compiled already meets above alignment restrictions. Hence the
1436 end result is that kernel runs from a physical address meeting
1437 above alignment restrictions.
1438
1439 Don't change this unless you know what you are doing.
1440
1441config HOTPLUG_CPU
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001442 bool "Support for hot-pluggable CPUs"
1443 depends on SMP && HOTPLUG && !X86_VOYAGER
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001444 ---help---
Dimitri Sivanich7c13e6a2008-08-11 10:46:46 -05001445 Say Y here to allow turning CPUs off and on. CPUs can be
1446 controlled through /sys/devices/system/cpu.
1447 ( Note: power management support will enable this option
1448 automatically on SMP systems. )
1449 Say N if you want to disable CPU hotplug.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001450
1451config COMPAT_VDSO
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001452 def_bool y
1453 prompt "Compat VDSO support"
Roland McGrathaf65d642008-01-30 13:30:43 +01001454 depends on X86_32 || IA32_EMULATION
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001455 help
Roland McGrathaf65d642008-01-30 13:30:43 +01001456 Map the 32-bit VDSO to the predictable old-style address too.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001457 ---help---
1458 Say N here if you are running a sufficiently recent glibc
1459 version (2.3.3 or later), to remove the high-mapped
1460 VDSO mapping and to exclusively use the randomized VDSO.
1461
1462 If unsure, say Y.
1463
Tim Bird516cbf32008-08-12 12:52:36 -07001464config CMDLINE_BOOL
1465 bool "Built-in kernel command line"
1466 default n
1467 help
1468 Allow for specifying boot arguments to the kernel at
1469 build time. On some systems (e.g. embedded ones), it is
1470 necessary or convenient to provide some or all of the
1471 kernel boot arguments with the kernel itself (that is,
1472 to not rely on the boot loader to provide them.)
1473
1474 To compile command line arguments into the kernel,
1475 set this option to 'Y', then fill in the
1476 the boot arguments in CONFIG_CMDLINE.
1477
1478 Systems with fully functional boot loaders (i.e. non-embedded)
1479 should leave this option set to 'N'.
1480
1481config CMDLINE
1482 string "Built-in kernel command string"
1483 depends on CMDLINE_BOOL
1484 default ""
1485 help
1486 Enter arguments here that should be compiled into the kernel
1487 image and used at boot time. If the boot loader provides a
1488 command line at boot time, it is appended to this string to
1489 form the full kernel command line, when the system boots.
1490
1491 However, you can use the CONFIG_CMDLINE_OVERRIDE option to
1492 change this behavior.
1493
1494 In most cases, the command line (whether built-in or provided
1495 by the boot loader) should specify the device for the root
1496 file system.
1497
1498config CMDLINE_OVERRIDE
1499 bool "Built-in command line overrides boot loader arguments"
1500 default n
1501 depends on CMDLINE_BOOL
1502 help
1503 Set this option to 'Y' to have the kernel ignore the boot loader
1504 command line, and use ONLY the built-in command line.
1505
1506 This is used to work around broken boot loaders. This should
1507 be set to 'N' under normal conditions.
1508
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001509endmenu
1510
1511config ARCH_ENABLE_MEMORY_HOTPLUG
1512 def_bool y
1513 depends on X86_64 || (X86_32 && HIGHMEM)
1514
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001515config HAVE_ARCH_EARLY_PFN_TO_NID
1516 def_bool X86_64
1517 depends on NUMA
1518
Bjorn Helgaasda85f862008-11-05 13:37:27 -06001519menu "Power management and ACPI options"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001520 depends on !X86_VOYAGER
1521
1522config ARCH_HIBERNATION_HEADER
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001523 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001524 depends on X86_64 && HIBERNATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001525
1526source "kernel/power/Kconfig"
1527
1528source "drivers/acpi/Kconfig"
1529
Andi Kleena6b68072008-01-30 13:32:49 +01001530config X86_APM_BOOT
1531 bool
1532 default y
1533 depends on APM || APM_MODULE
1534
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001535menuconfig APM
1536 tristate "APM (Advanced Power Management) BIOS support"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001537 depends on X86_32 && PM_SLEEP
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001538 ---help---
1539 APM is a BIOS specification for saving power using several different
1540 techniques. This is mostly useful for battery powered laptops with
1541 APM compliant BIOSes. If you say Y here, the system time will be
1542 reset after a RESUME operation, the /proc/apm device will provide
1543 battery status information, and user-space programs will receive
1544 notification of APM "events" (e.g. battery status change).
1545
1546 If you select "Y" here, you can disable actual use of the APM
1547 BIOS by passing the "apm=off" option to the kernel at boot time.
1548
1549 Note that the APM support is almost completely disabled for
1550 machines with more than one CPU.
1551
1552 In order to use APM, you will need supporting software. For location
Randy Dunlap53471122008-03-12 18:10:51 -04001553 and more information, read <file:Documentation/power/pm.txt> and the
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001554 Battery Powered Linux mini-HOWTO, available from
1555 <http://www.tldp.org/docs.html#howto>.
1556
1557 This driver does not spin down disk drives (see the hdparm(8)
1558 manpage ("man 8 hdparm") for that), and it doesn't turn off
1559 VESA-compliant "green" monitors.
1560
1561 This driver does not support the TI 4000M TravelMate and the ACER
1562 486/DX4/75 because they don't have compliant BIOSes. Many "green"
1563 desktop machines also don't have compliant BIOSes, and this driver
1564 may cause those machines to panic during the boot phase.
1565
1566 Generally, if you don't have a battery in your machine, there isn't
1567 much point in using this driver and you should say N. If you get
1568 random kernel OOPSes or reboots that don't seem to be related to
1569 anything, try disabling/enabling this option (or disabling/enabling
1570 APM in your BIOS).
1571
1572 Some other things you should try when experiencing seemingly random,
1573 "weird" problems:
1574
1575 1) make sure that you have enough swap space and that it is
1576 enabled.
1577 2) pass the "no-hlt" option to the kernel
1578 3) switch on floating point emulation in the kernel and pass
1579 the "no387" option to the kernel
1580 4) pass the "floppy=nodma" option to the kernel
1581 5) pass the "mem=4M" option to the kernel (thereby disabling
1582 all but the first 4 MB of RAM)
1583 6) make sure that the CPU is not over clocked.
1584 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
1585 8) disable the cache from your BIOS settings
1586 9) install a fan for the video card or exchange video RAM
1587 10) install a better fan for the CPU
1588 11) exchange RAM chips
1589 12) exchange the motherboard.
1590
1591 To compile this driver as a module, choose M here: the
1592 module will be called apm.
1593
1594if APM
1595
1596config APM_IGNORE_USER_SUSPEND
1597 bool "Ignore USER SUSPEND"
1598 help
1599 This option will ignore USER SUSPEND requests. On machines with a
1600 compliant APM BIOS, you want to say N. However, on the NEC Versa M
1601 series notebooks, it is necessary to say Y because of a BIOS bug.
1602
1603config APM_DO_ENABLE
1604 bool "Enable PM at boot time"
1605 ---help---
1606 Enable APM features at boot time. From page 36 of the APM BIOS
1607 specification: "When disabled, the APM BIOS does not automatically
1608 power manage devices, enter the Standby State, enter the Suspend
1609 State, or take power saving steps in response to CPU Idle calls."
1610 This driver will make CPU Idle calls when Linux is idle (unless this
1611 feature is turned off -- see "Do CPU IDLE calls", below). This
1612 should always save battery power, but more complicated APM features
1613 will be dependent on your BIOS implementation. You may need to turn
1614 this option off if your computer hangs at boot time when using APM
1615 support, or if it beeps continuously instead of suspending. Turn
1616 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
1617 T400CDT. This is off by default since most machines do fine without
1618 this feature.
1619
1620config APM_CPU_IDLE
1621 bool "Make CPU Idle calls when idle"
1622 help
1623 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
1624 On some machines, this can activate improved power savings, such as
1625 a slowed CPU clock rate, when the machine is idle. These idle calls
1626 are made after the idle loop has run for some length of time (e.g.,
1627 333 mS). On some machines, this will cause a hang at boot time or
1628 whenever the CPU becomes idle. (On machines with more than one CPU,
1629 this option does nothing.)
1630
1631config APM_DISPLAY_BLANK
1632 bool "Enable console blanking using APM"
1633 help
1634 Enable console blanking using the APM. Some laptops can use this to
1635 turn off the LCD backlight when the screen blanker of the Linux
1636 virtual console blanks the screen. Note that this is only used by
1637 the virtual console screen blanker, and won't turn off the backlight
1638 when using the X Window system. This also doesn't have anything to
1639 do with your VESA-compliant power-saving monitor. Further, this
1640 option doesn't work for all laptops -- it might not turn off your
1641 backlight at all, or it might print a lot of errors to the console,
1642 especially if you are using gpm.
1643
1644config APM_ALLOW_INTS
1645 bool "Allow interrupts during APM BIOS calls"
1646 help
1647 Normally we disable external interrupts while we are making calls to
1648 the APM BIOS as a measure to lessen the effects of a badly behaving
1649 BIOS implementation. The BIOS should reenable interrupts if it
1650 needs to. Unfortunately, some BIOSes do not -- especially those in
1651 many of the newer IBM Thinkpads. If you experience hangs when you
1652 suspend, try setting this to Y. Otherwise, say N.
1653
1654config APM_REAL_MODE_POWER_OFF
1655 bool "Use real mode APM BIOS call to power off"
1656 help
1657 Use real mode APM BIOS calls to switch off the computer. This is
1658 a work-around for a number of buggy BIOSes. Switch this option on if
1659 your computer crashes instead of powering off properly.
1660
1661endif # APM
1662
1663source "arch/x86/kernel/cpu/cpufreq/Kconfig"
1664
1665source "drivers/cpuidle/Kconfig"
1666
Andy Henroid27471fd2008-10-09 11:45:22 -07001667source "drivers/idle/Kconfig"
1668
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001669endmenu
1670
1671
1672menu "Bus options (PCI etc.)"
1673
1674config PCI
Ingo Molnar1ac97012008-05-19 14:10:14 +02001675 bool "PCI support"
Adrian Bunk1c858082008-01-30 13:32:32 +01001676 default y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001677 select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
1678 help
1679 Find out whether you have a PCI motherboard. PCI is the name of a
1680 bus system, i.e. the way the CPU talks to the other stuff inside
1681 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1682 VESA. If you have PCI, say Y, otherwise N.
1683
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001684choice
1685 prompt "PCI access mode"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001686 depends on X86_32 && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001687 default PCI_GOANY
1688 ---help---
1689 On PCI systems, the BIOS can be used to detect the PCI devices and
1690 determine their configuration. However, some old PCI motherboards
1691 have BIOS bugs and may crash if this is done. Also, some embedded
1692 PCI-based systems don't have any BIOS at all. Linux can also try to
1693 detect the PCI hardware directly without using the BIOS.
1694
1695 With this option, you can specify how Linux should detect the
1696 PCI devices. If you choose "BIOS", the BIOS will be used,
1697 if you choose "Direct", the BIOS won't be used, and if you
1698 choose "MMConfig", then PCI Express MMCONFIG will be used.
1699 If you choose "Any", the kernel will try MMCONFIG, then the
1700 direct access method and falls back to the BIOS if that doesn't
1701 work. If unsure, go with the default, which is "Any".
1702
1703config PCI_GOBIOS
1704 bool "BIOS"
1705
1706config PCI_GOMMCONFIG
1707 bool "MMConfig"
1708
1709config PCI_GODIRECT
1710 bool "Direct"
1711
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001712config PCI_GOOLPC
1713 bool "OLPC"
1714 depends on OLPC
1715
Andres Salomon2bdd1b02008-06-05 14:14:41 -07001716config PCI_GOANY
1717 bool "Any"
1718
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001719endchoice
1720
1721config PCI_BIOS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001722 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001723 depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001724
1725# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
1726config PCI_DIRECT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001727 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001728 depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001729
1730config PCI_MMCONFIG
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001731 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001732 depends on X86_32 && PCI && ACPI && (PCI_GOMMCONFIG || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001733
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001734config PCI_OLPC
Andres Salomon2bdd1b02008-06-05 14:14:41 -07001735 def_bool y
1736 depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001737
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001738config PCI_DOMAINS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001739 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001740 depends on PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001741
1742config PCI_MMCONFIG
1743 bool "Support mmconfig PCI config space access"
1744 depends on X86_64 && PCI && ACPI
1745
1746config DMAR
1747 bool "Support for DMA Remapping Devices (EXPERIMENTAL)"
1748 depends on X86_64 && PCI_MSI && ACPI && EXPERIMENTAL
1749 help
1750 DMA remapping (DMAR) devices support enables independent address
1751 translations for Direct Memory Access (DMA) from devices.
1752 These DMA remapping devices are reported via ACPI tables
1753 and include PCI device scope covered by these DMA
1754 remapping devices.
1755
1756config DMAR_GFX_WA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001757 def_bool y
1758 prompt "Support for Graphics workaround"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001759 depends on DMAR
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001760 help
1761 Current Graphics drivers tend to use physical address
1762 for DMA and avoid using DMA APIs. Setting this config
1763 option permits the IOMMU driver to set a unity map for
1764 all the OS-visible memory. Hence the driver can continue
1765 to use physical addresses for DMA.
1766
1767config DMAR_FLOPPY_WA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001768 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001769 depends on DMAR
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001770 help
1771 Floppy disk drivers are know to bypass DMA API calls
1772 thereby failing to work when IOMMU is enabled. This
1773 workaround will setup a 1:1 mapping for the first
1774 16M to make floppy (an ISA device) work.
1775
Suresh Siddha9fa8c482008-07-10 11:17:00 -07001776config INTR_REMAP
1777 bool "Support for Interrupt Remapping (EXPERIMENTAL)"
1778 depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI && EXPERIMENTAL
1779 help
1780 Supports Interrupt remapping for IO-APIC and MSI devices.
1781 To use x2apic mode in the CPU's which support x2APIC enhancements or
1782 to support platforms with CPU's having > 8 bit APIC ID, say Y.
1783
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001784source "drivers/pci/pcie/Kconfig"
1785
1786source "drivers/pci/Kconfig"
1787
1788# x86_64 have no ISA slots, but do have ISA-style DMA.
1789config ISA_DMA_API
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001790 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001791
1792if X86_32
1793
1794config ISA
1795 bool "ISA support"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001796 depends on !X86_VOYAGER
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001797 help
1798 Find out whether you have ISA slots on your motherboard. ISA is the
1799 name of a bus system, i.e. the way the CPU talks to the other stuff
1800 inside your box. Other bus systems are PCI, EISA, MicroChannel
1801 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1802 newer boards don't support it. If you have ISA, say Y, otherwise N.
1803
1804config EISA
1805 bool "EISA support"
1806 depends on ISA
1807 ---help---
1808 The Extended Industry Standard Architecture (EISA) bus was
1809 developed as an open alternative to the IBM MicroChannel bus.
1810
1811 The EISA bus provided some of the features of the IBM MicroChannel
1812 bus while maintaining backward compatibility with cards made for
1813 the older ISA bus. The EISA bus saw limited use between 1988 and
1814 1995 when it was made obsolete by the PCI bus.
1815
1816 Say Y here if you are building a kernel for an EISA-based machine.
1817
1818 Otherwise, say N.
1819
1820source "drivers/eisa/Kconfig"
1821
1822config MCA
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001823 bool "MCA support" if !X86_VOYAGER
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001824 default y if X86_VOYAGER
1825 help
1826 MicroChannel Architecture is found in some IBM PS/2 machines and
1827 laptops. It is a bus system similar to PCI or ISA. See
1828 <file:Documentation/mca.txt> (and especially the web page given
1829 there) before attempting to build an MCA bus kernel.
1830
1831source "drivers/mca/Kconfig"
1832
1833config SCx200
1834 tristate "NatSemi SCx200 support"
1835 depends on !X86_VOYAGER
1836 help
1837 This provides basic support for National Semiconductor's
1838 (now AMD's) Geode processors. The driver probes for the
1839 PCI-IDs of several on-chip devices, so its a good dependency
1840 for other scx200_* drivers.
1841
1842 If compiled as a module, the driver is named scx200.
1843
1844config SCx200HR_TIMER
1845 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
1846 depends on SCx200 && GENERIC_TIME
1847 default y
1848 help
1849 This driver provides a clocksource built upon the on-chip
1850 27MHz high-resolution timer. Its also a workaround for
1851 NSC Geode SC-1100's buggy TSC, which loses time when the
1852 processor goes idle (as is done by the scheduler). The
1853 other workaround is idle=poll boot option.
1854
1855config GEODE_MFGPT_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001856 def_bool y
1857 prompt "Geode Multi-Function General Purpose Timer (MFGPT) events"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001858 depends on MGEODE_LX && GENERIC_TIME && GENERIC_CLOCKEVENTS
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001859 help
1860 This driver provides a clock event source based on the MFGPT
1861 timer(s) in the CS5535 and CS5536 companion chip for the geode.
1862 MFGPTs have a better resolution and max interval than the
1863 generic PIT, and are suitable for use as high-res timers.
1864
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001865config OLPC
1866 bool "One Laptop Per Child support"
1867 default n
1868 help
1869 Add support for detecting the unique features of the OLPC
1870 XO hardware.
1871
Sam Ravnborgbc0120f2007-11-06 23:10:39 +01001872endif # X86_32
1873
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001874config K8_NB
1875 def_bool y
Sam Ravnborgbc0120f2007-11-06 23:10:39 +01001876 depends on AGP_AMD64 || (X86_64 && (GART_IOMMU || (PCI && NUMA)))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001877
1878source "drivers/pcmcia/Kconfig"
1879
1880source "drivers/pci/hotplug/Kconfig"
1881
1882endmenu
1883
1884
1885menu "Executable file formats / Emulations"
1886
1887source "fs/Kconfig.binfmt"
1888
1889config IA32_EMULATION
1890 bool "IA32 Emulation"
1891 depends on X86_64
Roland McGratha97f52e2008-01-30 13:31:55 +01001892 select COMPAT_BINFMT_ELF
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001893 help
1894 Include code to run 32-bit programs under a 64-bit kernel. You should
1895 likely turn this on, unless you're 100% sure that you don't have any
1896 32-bit programs left.
1897
1898config IA32_AOUT
1899 tristate "IA32 a.out support"
David Woodhouse6b213e12008-06-16 12:39:13 +01001900 depends on IA32_EMULATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001901 help
1902 Support old a.out binaries in the 32bit emulation.
1903
1904config COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001905 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001906 depends on IA32_EMULATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001907
1908config COMPAT_FOR_U64_ALIGNMENT
1909 def_bool COMPAT
1910 depends on X86_64
1911
1912config SYSVIPC_COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001913 def_bool y
Alexey Dobriyanb8992192008-09-14 13:44:41 +04001914 depends on COMPAT && SYSVIPC
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001915
1916endmenu
1917
1918
Keith Packarde5beae12008-11-03 18:21:45 +01001919config HAVE_ATOMIC_IOMAP
1920 def_bool y
1921 depends on X86_32
1922
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001923source "net/Kconfig"
1924
1925source "drivers/Kconfig"
1926
1927source "drivers/firmware/Kconfig"
1928
1929source "fs/Kconfig"
1930
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001931source "arch/x86/Kconfig.debug"
1932
1933source "security/Kconfig"
1934
1935source "crypto/Kconfig"
1936
Avi Kivityedf88412007-12-16 11:02:48 +02001937source "arch/x86/kvm/Kconfig"
1938
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001939source "lib/Kconfig"