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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
Ingo Molnara5574cf2008-05-05 23:19:50 +020021 select HAVE_UNSTABLE_SCHED_CLOCK
Sam Ravnborgec7748b2008-02-09 10:46:40 +010022 select HAVE_IDE
Mathieu Desnoyers42d4b832008-02-02 15:10:34 -050023 select HAVE_OPROFILE
Rik van Riel28b2ee22008-07-23 21:27:05 -070024 select HAVE_IOREMAP_PROT
Mathieu Desnoyers3f550092008-02-02 15:10:35 -050025 select HAVE_KPROBES
Ingo Molnar1f972762008-07-26 13:52:50 +020026 select ARCH_WANT_OPTIONAL_GPIOLIB
Ananth N Mavinakayanahalli9edddaa2008-03-04 14:28:37 -080027 select HAVE_KRETPROBES
Steven Rostedt677aa9f2008-05-17 00:01:36 -040028 select HAVE_DYNAMIC_FTRACE
Arnaldo Carvalho de Melo16444a82008-05-12 21:20:42 +020029 select HAVE_FTRACE
Randy Dunlap1a4e3f82008-02-20 09:20:08 -080030 select HAVE_KVM if ((X86_32 && !X86_VOYAGER && !X86_VISWS && !X86_NUMAQ) || X86_64)
Ingo Molnarfcbc04c2008-04-21 13:39:53 +020031 select HAVE_ARCH_KGDB if !X86_VOYAGER
Dmitry Baryshkov323ec002008-06-29 14:19:31 +040032 select HAVE_GENERIC_DMA_COHERENT if X86_32
Johannes Berg58340a02008-07-25 01:45:33 -070033 select HAVE_EFFICIENT_UNALIGNED_ACCESS
Balbir Singh7d8330a2008-02-10 12:46:28 +053034
Sam Ravnborg73531902008-05-25 23:03:18 +020035config ARCH_DEFCONFIG
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +020036 string
Sam Ravnborg73531902008-05-25 23:03:18 +020037 default "arch/x86/configs/i386_defconfig" if X86_32
38 default "arch/x86/configs/x86_64_defconfig" if X86_64
Sam Ravnborgb9b39bf2008-04-29 12:48:15 +020039
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010040
Nick Piggin95c354f2008-01-30 13:31:20 +010041config GENERIC_LOCKBREAK
Nick Piggin314cdbe2008-01-30 13:31:21 +010042 def_bool n
Nick Piggin95c354f2008-01-30 13:31:20 +010043
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010044config GENERIC_TIME
Harvey Harrison3c2362e2008-01-30 13:31:03 +010045 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010046
47config GENERIC_CMOS_UPDATE
Harvey Harrison3c2362e2008-01-30 13:31:03 +010048 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010049
50config CLOCKSOURCE_WATCHDOG
Harvey Harrison3c2362e2008-01-30 13:31:03 +010051 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010052
53config GENERIC_CLOCKEVENTS
Harvey Harrison3c2362e2008-01-30 13:31:03 +010054 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010055
56config GENERIC_CLOCKEVENTS_BROADCAST
Harvey Harrison3c2362e2008-01-30 13:31:03 +010057 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010058 depends on X86_64 || (X86_32 && X86_LOCAL_APIC)
59
60config LOCKDEP_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +010061 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010062
63config STACKTRACE_SUPPORT
Harvey Harrison3c2362e2008-01-30 13:31:03 +010064 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010065
Heiko Carstensaa7d9352008-02-01 17:45:14 +010066config HAVE_LATENCYTOP_SUPPORT
67 def_bool y
68
Christoph Lameter1f842602008-01-07 23:20:30 -080069config FAST_CMPXCHG_LOCAL
70 bool
71 default y
72
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010073config MMU
Harvey Harrison3c2362e2008-01-30 13:31:03 +010074 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010075
76config ZONE_DMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +010077 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010078
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010079config SBUS
80 bool
81
82config GENERIC_ISA_DMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +010083 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010084
85config GENERIC_IOMAP
Harvey Harrison3c2362e2008-01-30 13:31:03 +010086 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010087
88config GENERIC_BUG
Harvey Harrison3c2362e2008-01-30 13:31:03 +010089 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010090 depends on BUG
91
92config GENERIC_HWEIGHT
Harvey Harrison3c2362e2008-01-30 13:31:03 +010093 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010094
Florian Fainellia6082952008-01-30 13:33:35 +010095config GENERIC_GPIO
96 def_bool n
97
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +010098config ARCH_MAY_HAVE_PC_FDC
Harvey Harrison3c2362e2008-01-30 13:31:03 +010099 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100100
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100101config RWSEM_GENERIC_SPINLOCK
102 def_bool !X86_XADD
103
104config RWSEM_XCHGADD_ALGORITHM
105 def_bool X86_XADD
106
107config ARCH_HAS_ILOG2_U32
108 def_bool n
109
110config ARCH_HAS_ILOG2_U64
111 def_bool n
112
Venki Pallipadia6869cc2008-02-08 17:05:44 -0800113config ARCH_HAS_CPU_IDLE_WAIT
114 def_bool y
115
Sam Ravnborg1032c0b2007-11-06 21:35:08 +0100116config GENERIC_CALIBRATE_DELAY
117 def_bool y
118
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100119config GENERIC_TIME_VSYSCALL
120 bool
121 default X86_64
122
venkatesh.pallipadi@intel.com9a0b8412008-01-31 17:35:06 -0800123config ARCH_HAS_CPU_RELAX
124 def_bool y
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100125
Pekka Enberg1b27d052008-04-28 02:12:22 -0700126config ARCH_HAS_CACHE_LINE_SIZE
127 def_bool y
128
Mike Travisdd5af902008-01-30 13:33:32 +0100129config HAVE_SETUP_PER_CPU_AREA
Mike Travis23ca4bb2008-05-12 21:21:12 +0200130 def_bool X86_64_SMP || (X86_SMP && !X86_VOYAGER)
travis@sgi.comb32ef632008-01-30 13:32:51 +0100131
Mike Travis9f0e8d02008-04-04 18:11:01 -0700132config HAVE_CPUMASK_OF_CPU_MAP
133 def_bool X86_64_SMP
134
Johannes Berg801e4062007-12-08 02:12:39 +0100135config ARCH_HIBERNATION_POSSIBLE
136 def_bool y
137 depends on !SMP || !X86_VOYAGER
138
Johannes Bergf4cb5702007-12-08 02:14:00 +0100139config ARCH_SUSPEND_POSSIBLE
140 def_bool y
141 depends on !X86_VOYAGER
142
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100143config ZONE_DMA32
144 bool
145 default X86_64
146
147config ARCH_POPULATES_NODE_MAP
148 def_bool y
149
150config AUDIT_ARCH
151 bool
152 default X86_64
153
David Howellsb0b933c2008-02-08 04:19:27 -0800154config ARCH_SUPPORTS_AOUT
155 def_bool y
156
Ingo Molnar765c68b2008-04-09 11:03:37 +0200157config ARCH_SUPPORTS_OPTIMIZED_INLINING
158 def_bool y
159
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100160# Use the generic interrupt handling code in kernel/irq/:
161config GENERIC_HARDIRQS
162 bool
163 default y
164
165config GENERIC_IRQ_PROBE
166 bool
167 default y
168
169config GENERIC_PENDING_IRQ
170 bool
171 depends on GENERIC_HARDIRQS && SMP
172 default y
173
174config X86_SMP
175 bool
Sam Ravnborg6b0c3d42008-01-30 13:32:27 +0100176 depends on SMP && ((X86_32 && !X86_VOYAGER) || X86_64)
Jens Axboe3b16cf82008-06-26 11:21:54 +0200177 select USE_GENERIC_SMP_HELPERS
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100178 default y
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
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200191 depends on (X86_32 && !X86_VOYAGER) || X86_64
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100192 default y
193
194config X86_BIOS_REBOOT
195 bool
Ingo Molnar31ac4092008-07-10 13:31:04 +0200196 depends on !X86_VOYAGER
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100197 default y
198
199config X86_TRAMPOLINE
200 bool
Pavel Macheke44b7b72008-04-10 23:28:10 +0200201 depends on X86_SMP || (X86_VOYAGER && SMP) || (64BIT && ACPI_SLEEP)
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100202 default y
203
204config KTIME_SCALAR
205 def_bool X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100206source "init/Kconfig"
Sam Ravnborg8d5fffb2007-11-06 23:30:30 +0100207
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100208menu "Processor type and features"
209
210source "kernel/time/Kconfig"
211
212config SMP
213 bool "Symmetric multi-processing support"
214 ---help---
215 This enables support for systems with more than one CPU. If you have
216 a system with only one CPU, like most personal computers, say N. If
217 you have a system with more than one CPU, say Y.
218
219 If you say N here, the kernel will run on single and multiprocessor
220 machines, but will use only one CPU of a multiprocessor machine. If
221 you say Y here, the kernel will run on many, but not all,
222 singleprocessor machines. On a singleprocessor machine, the kernel
223 will run faster if you say N here.
224
225 Note that if you say Y here and choose architecture "586" or
226 "Pentium" under "Processor family", the kernel will not work on 486
227 architectures. Similarly, multiprocessor kernels for the "PPro"
228 architecture may not work on all Pentium based boards.
229
230 People using multiprocessor machines who say Y here should also say
231 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
232 Management" code will be disabled if you say Y here.
233
Adrian Bunk03502fa2008-02-03 15:50:21 +0200234 See also <file:Documentation/i386/IO-APIC.txt>,
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100235 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
236 <http://www.tldp.org/docs.html#howto>.
237
238 If you don't know what to do here, say N.
239
Yinghai Lu6695c852008-06-19 12:13:09 -0700240config X86_FIND_SMP_CONFIG
241 def_bool y
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200242 depends on X86_MPPARSE || X86_VOYAGER
Yinghai Lu6695c852008-06-19 12:13:09 -0700243
244if ACPI
245config X86_MPPARSE
246 def_bool y
247 bool "Enable MPS table"
Ingo Molnar5ab74722008-07-10 14:42:03 +0200248 depends on X86_LOCAL_APIC
Yinghai Lu6695c852008-06-19 12:13:09 -0700249 help
250 For old smp systems that do not have proper acpi support. Newer systems
251 (esp with 64bit cpus) with acpi support, MADT and DSDT will override it
252endif
253
254if !ACPI
255config X86_MPPARSE
256 def_bool y
Ingo Molnar5ab74722008-07-10 14:42:03 +0200257 depends on X86_LOCAL_APIC
Yinghai Lu6695c852008-06-19 12:13:09 -0700258endif
259
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100260choice
261 prompt "Subarchitecture Type"
262 default X86_PC
263
264config X86_PC
265 bool "PC-compatible"
266 help
267 Choose this option if your computer is a standard PC or compatible.
268
269config X86_ELAN
270 bool "AMD Elan"
271 depends on X86_32
272 help
273 Select this for an AMD Elan processor.
274
275 Do not use this option for K6/Athlon/Opteron processors!
276
277 If unsure, choose "PC-compatible" instead.
278
279config X86_VOYAGER
280 bool "Voyager (NCR)"
Ingo Molnar1ac97012008-05-19 14:10:14 +0200281 depends on X86_32 && (SMP || BROKEN) && !PCI
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100282 help
283 Voyager is an MCA-based 32-way capable SMP architecture proprietary
284 to NCR Corp. Machine classes 345x/35xx/4100/51xx are Voyager-based.
285
286 *** WARNING ***
287
288 If you do not specifically know you have a Voyager based machine,
289 say N here, otherwise the kernel you build will not be bootable.
290
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100291config X86_GENERICARCH
Yinghai Lud49c4282008-06-08 18:31:54 -0700292 bool "Generic architecture"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100293 depends on X86_32
294 help
Yinghai Lud49c4282008-06-08 18:31:54 -0700295 This option compiles in the NUMAQ, Summit, bigsmp, ES7000, default
296 subarchitectures. It is intended for a generic binary kernel.
297 if you select them all, kernel will probe it one by one. and will
298 fallback to default.
299
300if X86_GENERICARCH
301
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100302config X86_NUMAQ
303 bool "NUMAQ (IBM/Sequent)"
Ingo Molnar3de352b2008-07-08 11:14:58 +0200304 depends on SMP && X86_32 && PCI && X86_MPPARSE
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100305 select NUMA
306 help
Yinghai Lud49c4282008-06-08 18:31:54 -0700307 This option is used for getting Linux to run on a NUMAQ (IBM/Sequent)
308 NUMA multiquad box. This changes the way that processors are
309 bootstrapped, and uses Clustered Logical APIC addressing mode instead
310 of Flat Logical. You will need a new lynxer.elf file to flash your
311 firmware with - send email to <Martin.Bligh@us.ibm.com>.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100312
313config X86_SUMMIT
314 bool "Summit/EXA (IBM x440)"
315 depends on X86_32 && SMP
316 help
317 This option is needed for IBM systems that use the Summit/EXA chipset.
318 In particular, it is needed for the x440.
319
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100320config X86_ES7000
321 bool "Support for Unisys ES7000 IA32 series"
322 depends on X86_32 && SMP
323 help
324 Support for Unisys ES7000 systems. Say 'Y' here if this kernel is
325 supposed to run on an IA32-based Unisys ES7000 system.
Yinghai Lud49c4282008-06-08 18:31:54 -0700326
327config X86_BIGSMP
328 bool "Support for big SMP systems with more than 8 CPUs"
329 depends on X86_32 && SMP
330 help
331 This option is needed for the systems that have more than 8 CPUs
332 and if the system is not of any sub-arch type above.
333
334endif
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100335
336config X86_VSMP
337 bool "Support for ScaleMP vSMP"
Glauber Costa96597fd2008-02-11 17:16:04 -0200338 select PARAVIRT
Ingo Molnara6784ad2008-07-10 12:21:58 +0200339 depends on X86_64 && PCI
Glauber Costa96597fd2008-02-11 17:16:04 -0200340 help
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100341 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
342 supposed to run on these EM64T-based machines. Only choose this option
343 if you have one of these machines.
344
345endchoice
346
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200347config X86_VISWS
348 bool "SGI 320/540 (Visual Workstation)"
Ingo Molnar39415a42008-07-10 20:06:30 +0200349 depends on X86_32 && PCI && !X86_VOYAGER && X86_MPPARSE && PCI_GODIRECT
Ingo Molnar1b84e1c2008-07-10 15:55:27 +0200350 help
351 The SGI Visual Workstation series is an IA32-based workstation
352 based on SGI systems chips with some legacy PC hardware attached.
353
354 Say Y here to create a kernel to run on the SGI 320 or 540.
355
356 A kernel compiled for the Visual Workstation will run on general
357 PCs as well. See <file:Documentation/sgi-visws.txt> for details.
358
Ingo Molnar1f972762008-07-26 13:52:50 +0200359config X86_RDC321X
360 bool "RDC R-321x SoC"
361 depends on X86_32
362 select M486
363 select X86_REBOOTFIXUPS
364 help
365 This option is needed for RDC R-321x system-on-chip, also known
366 as R-8610-(G).
367 If you don't have one of these chips, you should say N here.
368
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100369config SCHED_NO_NO_OMIT_FRAME_POINTER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100370 def_bool y
371 prompt "Single-depth WCHAN output"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100372 depends on X86_32
373 help
374 Calculate simpler /proc/<PID>/wchan values. If this option
375 is disabled then wchan values will recurse back to the
376 caller function. This provides more accurate wchan values,
377 at the expense of slightly more scheduling overhead.
378
379 If in doubt, say "Y".
380
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100381menuconfig PARAVIRT_GUEST
382 bool "Paravirtualized guest support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100383 help
384 Say Y here to get to see options related to running Linux under
385 various hypervisors. This option alone does not add any kernel code.
386
387 If you say N, all options in this submenu will be skipped and disabled.
388
389if PARAVIRT_GUEST
390
391source "arch/x86/xen/Kconfig"
392
393config VMI
394 bool "VMI Guest support"
395 select PARAVIRT
Eduardo Pereira Habkost42d545c2008-01-30 13:33:32 +0100396 depends on X86_32
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200397 depends on !X86_VOYAGER
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100398 help
399 VMI provides a paravirtualized interface to the VMware ESX server
400 (it could be used by other hypervisors in theory too, but is not
401 at the moment), by linking the kernel to a GPL-ed ROM module
402 provided by the hypervisor.
403
Glauber de Oliveira Costa790c73f2008-02-15 17:52:48 -0200404config KVM_CLOCK
405 bool "KVM paravirtualized clock"
406 select PARAVIRT
Gerd Hoffmannf6e16d52008-06-03 16:17:32 +0200407 select PARAVIRT_CLOCK
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200408 depends on !X86_VOYAGER
Glauber de Oliveira Costa790c73f2008-02-15 17:52:48 -0200409 help
410 Turning on this option will allow you to run a paravirtualized clock
411 when running over the KVM hypervisor. Instead of relying on a PIT
412 (or probably other) emulation by the underlying device model, the host
413 provides the guest with timing infrastructure such as time of day, and
414 system time
415
Marcelo Tosatti0cf1bfd2008-02-22 12:21:36 -0500416config KVM_GUEST
417 bool "KVM Guest support"
418 select PARAVIRT
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200419 depends on !X86_VOYAGER
Marcelo Tosatti0cf1bfd2008-02-22 12:21:36 -0500420 help
421 This option enables various optimizations for running under the KVM
422 hypervisor.
423
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100424source "arch/x86/lguest/Kconfig"
425
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100426config PARAVIRT
427 bool "Enable paravirtualization code"
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200428 depends on !X86_VOYAGER
Eduardo Pereira Habkoste61bd942008-01-30 13:33:32 +0100429 help
430 This changes the kernel so it can modify itself when it is run
431 under a hypervisor, potentially improving performance significantly
432 over full virtualization. However, when run without a hypervisor
433 the kernel is theoretically slower and slightly larger.
434
Gerd Hoffmann7af192c2008-06-03 16:17:29 +0200435config PARAVIRT_CLOCK
436 bool
437 default n
438
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100439endif
440
Jeremy Fitzhardinge97349132008-06-25 00:19:14 -0400441config PARAVIRT_DEBUG
442 bool "paravirt-ops debugging"
443 depends on PARAVIRT && DEBUG_KERNEL
444 help
445 Enable to debug paravirt_ops internals. Specifically, BUG if
446 a paravirt_op is missing when it is called.
447
Yinghai Lu03273182008-04-18 17:49:15 -0700448config MEMTEST
449 bool "Memtest"
Yinghai Luc64df702008-03-21 18:56:19 -0700450 help
451 This option adds a kernel parameter 'memtest', which allows memtest
Yinghai Lu03273182008-04-18 17:49:15 -0700452 to be set.
453 memtest=0, mean disabled; -- default
454 memtest=1, mean do 1 test pattern;
455 ...
456 memtest=4, mean do 4 test patterns.
Thomas Gleixneraba37282008-07-15 14:48:48 +0200457 If you are unsure how to answer this question, answer N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100458
459config X86_SUMMIT_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100460 def_bool y
Yinghai Lu0699eae2008-06-17 15:39:01 -0700461 depends on X86_32 && NUMA && X86_GENERICARCH
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100462
463config X86_CYCLONE_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100464 def_bool y
Yinghai Lu0699eae2008-06-17 15:39:01 -0700465 depends on X86_GENERICARCH
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100466
467config ES7000_CLUSTERED_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100468 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100469 depends on SMP && X86_ES7000 && MPENTIUMIII
470
471source "arch/x86/Kconfig.cpu"
472
473config HPET_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100474 def_bool X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100475 prompt "HPET Timer Support" if X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100476 help
477 Use the IA-PC HPET (High Precision Event Timer) to manage
478 time in preference to the PIT and RTC, if a HPET is
479 present.
480 HPET is the next generation timer replacing legacy 8254s.
481 The HPET provides a stable time base on SMP
482 systems, unlike the TSC, but it is more expensive to access,
483 as it is off-chip. You can find the HPET spec at
484 <http://www.intel.com/hardwaredesign/hpetspec.htm>.
485
486 You can safely choose Y here. However, HPET will only be
487 activated if the platform and the BIOS support this feature.
488 Otherwise the 8254 will be used for timing services.
489
490 Choose N to continue using the legacy 8254 timer.
491
492config HPET_EMULATE_RTC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100493 def_bool y
Bernhard Walle9d8af782008-02-06 01:38:52 -0800494 depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100495
496# Mark as embedded because too many people got it wrong.
497# The code disables itself when not needed.
Thomas Petazzoni7ae93922008-04-28 02:14:14 -0700498config DMI
499 default y
500 bool "Enable DMI scanning" if EMBEDDED
501 help
502 Enabled scanning of DMI to identify machine quirks. Say Y
503 here unless you have verified that your setup is not
504 affected by entries in the DMI blacklist. Required by PNP
505 BIOS code.
506
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100507config GART_IOMMU
508 bool "GART IOMMU support" if EMBEDDED
509 default y
510 select SWIOTLB
511 select AGP
512 depends on X86_64 && PCI
513 help
514 Support for full DMA access of devices with 32bit memory access only
515 on systems with more than 3GB. This is usually needed for USB,
516 sound, many IDE/SATA chipsets and some other devices.
517 Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
518 based hardware IOMMU and a software bounce buffer based IOMMU used
519 on Intel systems and as fallback.
520 The code is only active when needed (enough memory and limited
521 device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
522 too.
523
524config CALGARY_IOMMU
525 bool "IBM Calgary IOMMU support"
526 select SWIOTLB
527 depends on X86_64 && PCI && EXPERIMENTAL
528 help
529 Support for hardware IOMMUs in IBM's xSeries x366 and x460
530 systems. Needed to run systems with more than 3GB of memory
531 properly with 32-bit PCI devices that do not support DAC
532 (Double Address Cycle). Calgary also supports bus level
533 isolation, where all DMAs pass through the IOMMU. This
534 prevents them from going anywhere except their intended
535 destination. This catches hard-to-find kernel bugs and
536 mis-behaving drivers and devices that do not use the DMA-API
537 properly to set up their DMA buffers. The IOMMU can be
538 turned off at boot time with the iommu=off parameter.
539 Normally the kernel will make the right choice by itself.
540 If unsure, say Y.
541
542config CALGARY_IOMMU_ENABLED_BY_DEFAULT
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100543 def_bool y
544 prompt "Should Calgary be enabled by default?"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100545 depends on CALGARY_IOMMU
546 help
547 Should Calgary be enabled by default? if you choose 'y', Calgary
548 will be used (if it exists). If you choose 'n', Calgary will not be
549 used even if it exists. If you choose 'n' and would like to use
550 Calgary anyway, pass 'iommu=calgary' on the kernel command line.
551 If unsure, say Y.
552
Joerg Roedel2b188722008-06-26 21:27:37 +0200553config AMD_IOMMU
554 bool "AMD IOMMU support"
Ingo Molnar07c40e82008-06-27 11:31:28 +0200555 select SWIOTLB
Ingo Molnar24d2ba02008-06-27 10:37:03 +0200556 depends on X86_64 && PCI && ACPI
Joerg Roedel2b188722008-06-26 21:27:37 +0200557 help
Joerg Roedel18d22202008-07-03 19:35:06 +0200558 With this option you can enable support for AMD IOMMU hardware in
559 your system. An IOMMU is a hardware component which provides
560 remapping of DMA memory accesses from devices. With an AMD IOMMU you
561 can isolate the the DMA memory of different devices and protect the
562 system from misbehaving device drivers or hardware.
563
564 You can find out if your system has an AMD IOMMU if you look into
565 your BIOS for an option to enable it or if you have an IVRS ACPI
566 table.
Joerg Roedel2b188722008-06-26 21:27:37 +0200567
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100568# need this always selected by IOMMU for the VIA workaround
569config SWIOTLB
570 bool
571 help
572 Support for software bounce buffers used on x86-64 systems
573 which don't have a hardware IOMMU (e.g. the current generation
574 of Intel's x86-64 CPUs). Using this PCI devices which can only
575 access 32-bits of memory can be used on systems with more than
576 3 GB of memory. If unsure, say Y.
577
FUJITA Tomonoria8522502008-04-29 00:59:36 -0700578config IOMMU_HELPER
FUJITA Tomonori18b743d2008-07-10 09:50:50 +0900579 def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU)
Mike Travis1184dc22008-05-12 21:21:12 +0200580config MAXSMP
581 bool "Configure Maximum number of SMP Processors and NUMA Nodes"
582 depends on X86_64 && SMP
583 default n
584 help
585 Configure maximum number of CPUS and NUMA Nodes for this architecture.
586 If unsure, say N.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100587
Mike Travis1184dc22008-05-12 21:21:12 +0200588if MAXSMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100589config NR_CPUS
Mike Travis1184dc22008-05-12 21:21:12 +0200590 int
591 default "4096"
592endif
593
594if !MAXSMP
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100595config NR_CPUS
Mike Travisc3ed6422008-05-16 10:44:39 -0700596 int "Maximum number of CPUs (2-4096)"
597 range 2 4096
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100598 depends on SMP
599 default "32" if X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000
600 default "8"
601 help
602 This allows you to specify the maximum number of CPUs which this
Mike Travisc3ed6422008-05-16 10:44:39 -0700603 kernel will support. The maximum supported value is 4096 and the
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100604 minimum value which makes sense is 2.
605
606 This is purely to save memory - each supported CPU adds
607 approximately eight kilobytes to the kernel image.
Mike Travis1184dc22008-05-12 21:21:12 +0200608endif
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100609
610config SCHED_SMT
611 bool "SMT (Hyperthreading) scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800612 depends on X86_HT
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100613 help
614 SMT scheduler support improves the CPU scheduler's decision making
615 when dealing with Intel Pentium 4 chips with HyperThreading at a
616 cost of slightly increased overhead in some places. If unsure say
617 N here.
618
619config SCHED_MC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100620 def_bool y
621 prompt "Multi-core scheduler support"
Hiroshi Shimamotob089c122008-02-27 13:16:30 -0800622 depends on X86_HT
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100623 help
624 Multi-core scheduler support improves the CPU scheduler's decision
625 making when dealing with multi-core CPU chips at a cost of slightly
626 increased overhead in some places. If unsure say N here.
627
628source "kernel/Kconfig.preempt"
629
630config X86_UP_APIC
631 bool "Local APIC support on uniprocessors"
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200632 depends on X86_32 && !SMP && !(X86_VOYAGER || X86_GENERICARCH)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100633 help
634 A local APIC (Advanced Programmable Interrupt Controller) is an
635 integrated interrupt controller in the CPU. If you have a single-CPU
636 system which has a processor with a local APIC, you can say Y here to
637 enable and use it. If you say Y here even though your machine doesn't
638 have a local APIC, then the kernel will still run with no slowdown at
639 all. The local APIC supports CPU-generated self-interrupts (timer,
640 performance counters), and the NMI watchdog which detects hard
641 lockups.
642
643config X86_UP_IOAPIC
644 bool "IO-APIC support on uniprocessors"
645 depends on X86_UP_APIC
646 help
647 An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
648 SMP-capable replacement for PC-style interrupt controllers. Most
649 SMP systems and many recent uniprocessor systems have one.
650
651 If you have a single-CPU system with an IO-APIC, you can say Y here
652 to use it. If you say Y here even though your machine doesn't have
653 an IO-APIC, then the kernel will still run with no slowdown at all.
654
655config X86_LOCAL_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100656 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200657 depends on X86_64 || (X86_32 && (X86_UP_APIC || (SMP && !X86_VOYAGER) || X86_GENERICARCH))
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100658
659config X86_IO_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100660 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200661 depends on X86_64 || (X86_32 && (X86_UP_IOAPIC || (SMP && !X86_VOYAGER) || X86_GENERICARCH))
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100662
663config X86_VISWS_APIC
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100664 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100665 depends on X86_32 && X86_VISWS
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100666
667config X86_MCE
668 bool "Machine Check Exception"
669 depends on !X86_VOYAGER
670 ---help---
671 Machine Check Exception support allows the processor to notify the
672 kernel if it detects a problem (e.g. overheating, component failure).
673 The action the kernel takes depends on the severity of the problem,
674 ranging from a warning message on the console, to halting the machine.
675 Your processor must be a Pentium or newer to support this - check the
676 flags in /proc/cpuinfo for mce. Note that some older Pentium systems
677 have a design flaw which leads to false MCE events - hence MCE is
678 disabled on all P5 processors, unless explicitly enabled with "mce"
679 as a boot argument. Similarly, if MCE is built in and creates a
680 problem on some new non-standard machine, you can boot with "nomce"
681 to disable it. MCE support simply ignores non-MCE processors like
682 the 386 and 486, so nearly everyone can say Y here.
683
684config X86_MCE_INTEL
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100685 def_bool y
686 prompt "Intel MCE features"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100687 depends on X86_64 && X86_MCE && X86_LOCAL_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100688 help
689 Additional support for intel specific MCE features such as
690 the thermal monitor.
691
692config X86_MCE_AMD
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100693 def_bool y
694 prompt "AMD MCE features"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100695 depends on X86_64 && X86_MCE && X86_LOCAL_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100696 help
697 Additional support for AMD specific MCE features such as
698 the DRAM Error Threshold.
699
700config X86_MCE_NONFATAL
701 tristate "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4"
702 depends on X86_32 && X86_MCE
703 help
704 Enabling this feature starts a timer that triggers every 5 seconds which
705 will look at the machine check registers to see if anything happened.
706 Non-fatal problems automatically get corrected (but still logged).
707 Disable this if you don't want to see these messages.
708 Seeing the messages this option prints out may be indicative of dying
709 or out-of-spec (ie, overclocked) hardware.
710 This option only does something on certain CPUs.
711 (AMD Athlon/Duron and Intel Pentium 4)
712
713config X86_MCE_P4THERMAL
714 bool "check for P4 thermal throttling interrupt."
Ingo Molnarefefa6f2008-07-10 16:09:50 +0200715 depends on X86_32 && X86_MCE && (X86_UP_APIC || SMP)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100716 help
717 Enabling this feature will cause a message to be printed when the P4
718 enters thermal throttling.
719
720config VM86
721 bool "Enable VM86 support" if EMBEDDED
722 default y
723 depends on X86_32
724 help
725 This option is required by programs like DOSEMU to run 16-bit legacy
726 code on X86 processors. It also may be needed by software like
727 XFree86 to initialize some video cards via BIOS. Disabling this
728 option saves about 6k.
729
730config TOSHIBA
731 tristate "Toshiba Laptop support"
732 depends on X86_32
733 ---help---
734 This adds a driver to safely access the System Management Mode of
735 the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
736 not work on models with a Phoenix BIOS. The System Management Mode
737 is used to set the BIOS and power saving options on Toshiba portables.
738
739 For information on utilities to make use of this driver see the
740 Toshiba Linux utilities web site at:
741 <http://www.buzzard.org.uk/toshiba/>.
742
743 Say Y if you intend to run this kernel on a Toshiba portable.
744 Say N otherwise.
745
746config I8K
747 tristate "Dell laptop support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100748 ---help---
749 This adds a driver to safely access the System Management Mode
750 of the CPU on the Dell Inspiron 8000. The System Management Mode
751 is used to read cpu temperature and cooling fan status and to
752 control the fans on the I8K portables.
753
754 This driver has been tested only on the Inspiron 8000 but it may
755 also work with other Dell laptops. You can force loading on other
756 models by passing the parameter `force=1' to the module. Use at
757 your own risk.
758
759 For information on utilities to make use of this driver see the
760 I8K Linux utilities web site at:
761 <http://people.debian.org/~dz/i8k/>
762
763 Say Y if you intend to run this kernel on a Dell Inspiron 8000.
764 Say N otherwise.
765
766config X86_REBOOTFIXUPS
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100767 def_bool n
768 prompt "Enable X86 board specific fixups for reboot"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100769 depends on X86_32 && X86
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100770 ---help---
771 This enables chipset and/or board specific fixups to be done
772 in order to get reboot to work correctly. This is only needed on
773 some combinations of hardware and BIOS. The symptom, for which
774 this config is intended, is when reboot ends with a stalled/hung
775 system.
776
777 Currently, the only fixup is for the Geode machines using
Florian Fainelli5e3a77e2008-01-30 13:33:36 +0100778 CS5530A and CS5536 chipsets and the RDC R-321x SoC.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100779
780 Say Y if you want to enable the fixup. Currently, it's safe to
781 enable this option even if you don't need it.
782 Say N otherwise.
783
784config MICROCODE
785 tristate "/dev/cpu/microcode - Intel IA32 CPU microcode support"
786 select FW_LOADER
787 ---help---
788 If you say Y here, you will be able to update the microcode on
789 Intel processors in the IA32 family, e.g. Pentium Pro, Pentium II,
790 Pentium III, Pentium 4, Xeon etc. You will obviously need the
791 actual microcode binary data itself which is not shipped with the
792 Linux kernel.
793
794 For latest news and information on obtaining all the required
795 ingredients for this driver, check:
796 <http://www.urbanmyth.org/microcode/>.
797
798 To compile this driver as a module, choose M here: the
799 module will be called microcode.
800
801config MICROCODE_OLD_INTERFACE
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100802 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100803 depends on MICROCODE
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100804
805config X86_MSR
806 tristate "/dev/cpu/*/msr - Model-specific register support"
807 help
808 This device gives privileged processes access to the x86
809 Model-Specific Registers (MSRs). It is a character device with
810 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
811 MSR accesses are directed to a specific CPU on multi-processor
812 systems.
813
814config X86_CPUID
815 tristate "/dev/cpu/*/cpuid - CPU information support"
816 help
817 This device gives processes access to the x86 CPUID instruction to
818 be executed on a specific processor. It is a character device
819 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
820 /dev/cpu/31/cpuid.
821
822choice
823 prompt "High Memory Support"
824 default HIGHMEM4G if !X86_NUMAQ
825 default HIGHMEM64G if X86_NUMAQ
826 depends on X86_32
827
828config NOHIGHMEM
829 bool "off"
830 depends on !X86_NUMAQ
831 ---help---
832 Linux can use up to 64 Gigabytes of physical memory on x86 systems.
833 However, the address space of 32-bit x86 processors is only 4
834 Gigabytes large. That means that, if you have a large amount of
835 physical memory, not all of it can be "permanently mapped" by the
836 kernel. The physical memory that's not permanently mapped is called
837 "high memory".
838
839 If you are compiling a kernel which will never run on a machine with
840 more than 1 Gigabyte total physical RAM, answer "off" here (default
841 choice and suitable for most users). This will result in a "3GB/1GB"
842 split: 3GB are mapped so that each process sees a 3GB virtual memory
843 space and the remaining part of the 4GB virtual memory space is used
844 by the kernel to permanently map as much physical memory as
845 possible.
846
847 If the machine has between 1 and 4 Gigabytes physical RAM, then
848 answer "4GB" here.
849
850 If more than 4 Gigabytes is used then answer "64GB" here. This
851 selection turns Intel PAE (Physical Address Extension) mode on.
852 PAE implements 3-level paging on IA32 processors. PAE is fully
853 supported by Linux, PAE mode is implemented on all recent Intel
854 processors (Pentium Pro and better). NOTE: If you say "64GB" here,
855 then the kernel will not boot on CPUs that don't support PAE!
856
857 The actual amount of total physical memory will either be
858 auto detected or can be forced by using a kernel command line option
859 such as "mem=256M". (Try "man bootparam" or see the documentation of
860 your boot loader (lilo or loadlin) about how to pass options to the
861 kernel at boot time.)
862
863 If unsure, say "off".
864
865config HIGHMEM4G
866 bool "4GB"
867 depends on !X86_NUMAQ
868 help
869 Select this if you have a 32-bit processor and between 1 and 4
870 gigabytes of physical RAM.
871
872config HIGHMEM64G
873 bool "64GB"
874 depends on !M386 && !M486
875 select X86_PAE
876 help
877 Select this if you have a 32-bit processor and more than 4
878 gigabytes of physical RAM.
879
880endchoice
881
882choice
883 depends on EXPERIMENTAL
884 prompt "Memory split" if EMBEDDED
885 default VMSPLIT_3G
886 depends on X86_32
887 help
888 Select the desired split between kernel and user memory.
889
890 If the address range available to the kernel is less than the
891 physical memory installed, the remaining memory will be available
892 as "high memory". Accessing high memory is a little more costly
893 than low memory, as it needs to be mapped into the kernel first.
894 Note that increasing the kernel address space limits the range
895 available to user programs, making the address space there
896 tighter. Selecting anything other than the default 3G/1G split
897 will also likely make your kernel incompatible with binary-only
898 kernel modules.
899
900 If you are not absolutely sure what you are doing, leave this
901 option alone!
902
903 config VMSPLIT_3G
904 bool "3G/1G user/kernel split"
905 config VMSPLIT_3G_OPT
906 depends on !X86_PAE
907 bool "3G/1G user/kernel split (for full 1G low memory)"
908 config VMSPLIT_2G
909 bool "2G/2G user/kernel split"
910 config VMSPLIT_2G_OPT
911 depends on !X86_PAE
912 bool "2G/2G user/kernel split (for full 2G low memory)"
913 config VMSPLIT_1G
914 bool "1G/3G user/kernel split"
915endchoice
916
917config PAGE_OFFSET
918 hex
919 default 0xB0000000 if VMSPLIT_3G_OPT
920 default 0x80000000 if VMSPLIT_2G
921 default 0x78000000 if VMSPLIT_2G_OPT
922 default 0x40000000 if VMSPLIT_1G
923 default 0xC0000000
924 depends on X86_32
925
926config HIGHMEM
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100927 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100928 depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100929
930config X86_PAE
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100931 def_bool n
932 prompt "PAE (Physical Address Extension) Support"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100933 depends on X86_32 && !HIGHMEM4G
934 select RESOURCES_64BIT
935 help
936 PAE is required for NX support, and furthermore enables
937 larger swapspace support for non-overcommit purposes. It
938 has the cost of more pagetable lookup overhead, and also
939 consumes more pagetable space per process.
940
941# Common NUMA Features
942config NUMA
943 bool "Numa Memory Allocation and Scheduler Support (EXPERIMENTAL)"
944 depends on SMP
Yinghai Lu0699eae2008-06-17 15:39:01 -0700945 depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100946 default n if X86_PC
Yinghai Lu0699eae2008-06-17 15:39:01 -0700947 default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100948 help
949 Enable NUMA (Non Uniform Memory Access) support.
950 The kernel will try to allocate memory used by a CPU on the
951 local memory controller of the CPU and add some more
952 NUMA awareness to the kernel.
953
Pavel Machek04b69442008-08-14 17:16:50 +0200954 For 32-bit this is currently highly experimental and should be only
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100955 used for kernel development. It might also cause boot failures.
Pavel Machek04b69442008-08-14 17:16:50 +0200956 For 64-bit this is recommended on all multiprocessor Opteron systems.
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100957 If the system is EM64T, you should say N unless your system is
958 EM64T NUMA.
959
960comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
961 depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)
962
963config K8_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100964 def_bool y
965 prompt "Old style AMD Opteron NUMA detection"
966 depends on X86_64 && NUMA && PCI
967 help
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100968 Enable K8 NUMA node topology detection. You should say Y here if
969 you have a multi processor AMD K8 system. This uses an old
970 method to read the NUMA configuration directly from the builtin
971 Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
972 instead, which also takes priority if both are compiled in.
973
974config X86_64_ACPI_NUMA
Harvey Harrison3c2362e2008-01-30 13:31:03 +0100975 def_bool y
976 prompt "ACPI NUMA detection"
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100977 depends on X86_64 && NUMA && ACPI && PCI
978 select ACPI_NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100979 help
980 Enable ACPI SRAT based node topology detection.
981
Suresh Siddha6ec6e0d2008-03-25 10:14:35 -0700982# Some NUMA nodes have memory ranges that span
983# other nodes. Even though a pfn is valid and
984# between a node's start and end pfns, it may not
985# reside on that node. See memmap_init_zone()
986# for details.
987config NODES_SPAN_OTHER_NODES
988 def_bool y
989 depends on X86_64_ACPI_NUMA
990
Sam Ravnborg506f1d02007-11-09 21:56:54 +0100991config NUMA_EMU
992 bool "NUMA emulation"
993 depends on X86_64 && NUMA
994 help
995 Enable NUMA emulation. A flat machine will be split
996 into virtual nodes when booted with "numa=fake=N", where N is the
997 number of nodes. This is only useful for debugging.
998
Mike Travis1184dc22008-05-12 21:21:12 +0200999if MAXSMP
1000
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001001config NODES_SHIFT
Mike Travis1184dc22008-05-12 21:21:12 +02001002 int
1003 default "9"
1004endif
1005
1006if !MAXSMP
1007config NODES_SHIFT
1008 int "Maximum NUMA Nodes (as a power of 2)"
1009 range 1 9 if X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001010 default "6" if X86_64
1011 default "4" if X86_NUMAQ
1012 default "3"
1013 depends on NEED_MULTIPLE_NODES
Mike Travis1184dc22008-05-12 21:21:12 +02001014 help
1015 Specify the maximum number of NUMA Nodes available on the target
1016 system. Increases memory reserved to accomodate various tables.
1017endif
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001018
1019config HAVE_ARCH_BOOTMEM_NODE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001020 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001021 depends on X86_32 && NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001022
1023config ARCH_HAVE_MEMORY_PRESENT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001024 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001025 depends on X86_32 && DISCONTIGMEM
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001026
1027config NEED_NODE_MEMMAP_SIZE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001028 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001029 depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001030
1031config HAVE_ARCH_ALLOC_REMAP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001032 def_bool y
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001033 depends on X86_32 && NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001034
1035config ARCH_FLATMEM_ENABLE
1036 def_bool y
Mel Gorman409a7b82008-01-30 13:33:25 +01001037 depends on X86_32 && ARCH_SELECT_MEMORY_MODEL && X86_PC && !NUMA
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001038
1039config ARCH_DISCONTIGMEM_ENABLE
1040 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001041 depends on NUMA && X86_32
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001042
1043config ARCH_DISCONTIGMEM_DEFAULT
1044 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001045 depends on NUMA && X86_32
1046
1047config ARCH_SPARSEMEM_DEFAULT
1048 def_bool y
1049 depends on X86_64
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001050
1051config ARCH_SPARSEMEM_ENABLE
1052 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001053 depends on X86_64 || NUMA || (EXPERIMENTAL && X86_PC)
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001054 select SPARSEMEM_STATIC if X86_32
1055 select SPARSEMEM_VMEMMAP_ENABLE if X86_64
1056
1057config ARCH_SELECT_MEMORY_MODEL
1058 def_bool y
Christoph Lameterb2632952008-01-30 13:30:47 +01001059 depends on ARCH_SPARSEMEM_ENABLE
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001060
1061config ARCH_MEMORY_PROBE
1062 def_bool X86_64
1063 depends on MEMORY_HOTPLUG
1064
1065source "mm/Kconfig"
1066
1067config HIGHPTE
1068 bool "Allocate 3rd-level pagetables from highmem"
1069 depends on X86_32 && (HIGHMEM4G || HIGHMEM64G)
1070 help
1071 The VM uses one page table entry for each page of physical memory.
1072 For systems with a lot of RAM, this can be wasteful of precious
1073 low memory. Setting this option will put user-space page table
1074 entries in high memory.
1075
1076config MATH_EMULATION
1077 bool
1078 prompt "Math emulation" if X86_32
1079 ---help---
1080 Linux can emulate a math coprocessor (used for floating point
1081 operations) if you don't have one. 486DX and Pentium processors have
1082 a math coprocessor built in, 486SX and 386 do not, unless you added
1083 a 487DX or 387, respectively. (The messages during boot time can
1084 give you some hints here ["man dmesg"].) Everyone needs either a
1085 coprocessor or this emulation.
1086
1087 If you don't have a math coprocessor, you need to say Y here; if you
1088 say Y here even though you have a coprocessor, the coprocessor will
1089 be used nevertheless. (This behavior can be changed with the kernel
1090 command line option "no387", which comes handy if your coprocessor
1091 is broken. Try "man bootparam" or see the documentation of your boot
1092 loader (lilo or loadlin) about how to pass options to the kernel at
1093 boot time.) This means that it is a good idea to say Y here if you
1094 intend to use this kernel on different machines.
1095
1096 More information about the internals of the Linux math coprocessor
1097 emulation can be found in <file:arch/x86/math-emu/README>.
1098
1099 If you are not sure, say Y; apart from resulting in a 66 KB bigger
1100 kernel, it won't hurt.
1101
1102config MTRR
1103 bool "MTRR (Memory Type Range Register) support"
1104 ---help---
1105 On Intel P6 family processors (Pentium Pro, Pentium II and later)
1106 the Memory Type Range Registers (MTRRs) may be used to control
1107 processor access to memory ranges. This is most useful if you have
1108 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
1109 allows bus write transfers to be combined into a larger transfer
1110 before bursting over the PCI/AGP bus. This can increase performance
1111 of image write operations 2.5 times or more. Saying Y here creates a
1112 /proc/mtrr file which may be used to manipulate your processor's
1113 MTRRs. Typically the X server should use this.
1114
1115 This code has a reasonably generic interface so that similar
1116 control registers on other processors can be easily supported
1117 as well:
1118
1119 The Cyrix 6x86, 6x86MX and M II processors have Address Range
1120 Registers (ARRs) which provide a similar functionality to MTRRs. For
1121 these, the ARRs are used to emulate the MTRRs.
1122 The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
1123 MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
1124 write-combining. All of these processors are supported by this code
1125 and it makes sense to say Y here if you have one of them.
1126
1127 Saying Y here also fixes a problem with buggy SMP BIOSes which only
1128 set the MTRRs for the boot CPU and not for the secondary CPUs. This
1129 can lead to all sorts of problems, so it's good to say Y here.
1130
1131 You can safely say Y even if your machine doesn't have MTRRs, you'll
1132 just add about 9 KB to your kernel.
1133
1134 See <file:Documentation/mtrr.txt> for more information.
1135
Yinghai Lu95ffa242008-04-29 03:52:33 -07001136config MTRR_SANITIZER
Thomas Gleixneraba37282008-07-15 14:48:48 +02001137 bool
Yinghai Lu95ffa242008-04-29 03:52:33 -07001138 prompt "MTRR cleanup support"
1139 depends on MTRR
1140 help
Thomas Gleixneraba37282008-07-15 14:48:48 +02001141 Convert MTRR layout from continuous to discrete, so X drivers can
1142 add writeback entries.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001143
Thomas Gleixneraba37282008-07-15 14:48:48 +02001144 Can be disabled with disable_mtrr_cleanup on the kernel command line.
1145 The largest mtrr entry size for a continous block can be set with
1146 mtrr_chunk_size.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001147
Thomas Gleixneraba37282008-07-15 14:48:48 +02001148 If unsure, say N.
Yinghai Lu95ffa242008-04-29 03:52:33 -07001149
1150config MTRR_SANITIZER_ENABLE_DEFAULT
Yinghai Luf5098d62008-04-29 20:25:58 -07001151 int "MTRR cleanup enable value (0-1)"
1152 range 0 1
1153 default "0"
Yinghai Lu95ffa242008-04-29 03:52:33 -07001154 depends on MTRR_SANITIZER
1155 help
Yinghai Luf5098d62008-04-29 20:25:58 -07001156 Enable mtrr cleanup default value
Yinghai Lu95ffa242008-04-29 03:52:33 -07001157
Yinghai Lu12031a62008-05-02 02:40:22 -07001158config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
1159 int "MTRR cleanup spare reg num (0-7)"
1160 range 0 7
1161 default "1"
1162 depends on MTRR_SANITIZER
1163 help
1164 mtrr cleanup spare entries default, it can be changed via
Thomas Gleixneraba37282008-07-15 14:48:48 +02001165 mtrr_spare_reg_nr=N on the kernel command line.
Yinghai Lu12031a62008-05-02 02:40:22 -07001166
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001167config X86_PAT
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001168 bool
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001169 prompt "x86 PAT support"
Ingo Molnar2a8a2712008-04-26 10:26:52 +02001170 depends on MTRR
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001171 help
1172 Use PAT attributes to setup page level cache control.
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001173
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001174 PATs are the modern equivalents of MTRRs and are much more
1175 flexible than MTRRs.
1176
1177 Say N here if you see bootup problems (boot crash, boot hang,
Venki Pallipadi042b78e2008-03-24 14:22:35 -07001178 spontaneous reboots) or a non-working video driver.
venkatesh.pallipadi@intel.com2e5d9c82008-03-18 17:00:14 -07001179
1180 If unsure, say Y.
1181
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001182config EFI
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001183 def_bool n
Huang, Ying8b2cb7a2008-01-30 13:32:11 +01001184 prompt "EFI runtime service support"
Huang, Ying5b836832008-01-30 13:31:19 +01001185 depends on ACPI
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001186 ---help---
Huang, Ying8b2cb7a2008-01-30 13:32:11 +01001187 This enables the kernel to use EFI runtime services that are
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001188 available (such as the EFI variable services).
1189
Huang, Ying8b2cb7a2008-01-30 13:32:11 +01001190 This option is only useful on systems that have EFI firmware.
1191 In addition, you should use the latest ELILO loader available
1192 at <http://elilo.sourceforge.net> in order to take advantage
1193 of EFI runtime services. However, even with this option, the
1194 resultant kernel should continue to boot on existing non-EFI
1195 platforms.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001196
1197config IRQBALANCE
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001198 def_bool y
1199 prompt "Enable kernel irq balancing"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001200 depends on X86_32 && SMP && X86_IO_APIC
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001201 help
1202 The default yes will allow the kernel to do irq load balancing.
1203 Saying no will keep the kernel from doing irq load balancing.
1204
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001205config SECCOMP
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001206 def_bool y
1207 prompt "Enable seccomp to safely compute untrusted bytecode"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001208 depends on PROC_FS
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001209 help
1210 This kernel feature is useful for number crunching applications
1211 that may need to compute untrusted bytecode during their
1212 execution. By using pipes or other transports made available to
1213 the process as file descriptors supporting the read/write
1214 syscalls, it's possible to isolate those applications in
1215 their own address space using seccomp. Once seccomp is
1216 enabled via /proc/<pid>/seccomp, it cannot be disabled
1217 and the task is only allowed to execute a few safe syscalls
1218 defined by each seccomp mode.
1219
1220 If unsure, say Y. Only embedded should say N here.
1221
1222config CC_STACKPROTECTOR
1223 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
Linus Torvalds2c020a92008-02-22 08:21:38 -08001224 depends on X86_64 && EXPERIMENTAL && BROKEN
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001225 help
1226 This option turns on the -fstack-protector GCC feature. This
1227 feature puts, at the beginning of critical functions, a canary
1228 value on the stack just before the return address, and validates
1229 the value just before actually returning. Stack based buffer
1230 overflows (that need to overwrite this return address) now also
1231 overwrite the canary, which gets detected and the attack is then
1232 neutralized via a kernel panic.
1233
1234 This feature requires gcc version 4.2 or above, or a distribution
1235 gcc with the feature backported. Older versions are automatically
1236 detected and for those versions, this configuration option is ignored.
1237
1238config CC_STACKPROTECTOR_ALL
1239 bool "Use stack-protector for all functions"
1240 depends on CC_STACKPROTECTOR
1241 help
1242 Normally, GCC only inserts the canary value protection for
1243 functions that use large-ish on-stack buffers. By enabling
1244 this option, GCC will be asked to do this for ALL functions.
1245
1246source kernel/Kconfig.hz
1247
1248config KEXEC
1249 bool "kexec system call"
Ingo Molnar3e8f7e32008-04-28 10:46:58 +02001250 depends on X86_BIOS_REBOOT
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001251 help
1252 kexec is a system call that implements the ability to shutdown your
1253 current kernel, and to start another kernel. It is like a reboot
1254 but it is independent of the system firmware. And like a reboot
1255 you can start any kernel with it, not just Linux.
1256
1257 The name comes from the similarity to the exec system call.
1258
1259 It is an ongoing process to be certain the hardware in a machine
1260 is properly shutdown, so do not be surprised if this code does not
1261 initially work for you. It may help to enable device hotplugging
1262 support. As of this writing the exact hardware interface is
1263 strongly in flux, so no good recommendation can be made.
1264
1265config CRASH_DUMP
Pavel Machek04b69442008-08-14 17:16:50 +02001266 bool "kernel crash dumps"
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001267 depends on X86_64 || (X86_32 && HIGHMEM)
1268 help
1269 Generate crash dump after being started by kexec.
1270 This should be normally only set in special crash dump kernels
1271 which are loaded in the main kernel with kexec-tools into
1272 a specially reserved region and then later executed after
1273 a crash by kdump/kexec. The crash dump kernel must be compiled
1274 to a memory address not used by the main kernel or BIOS using
1275 PHYSICAL_START, or it must be built as a relocatable image
1276 (CONFIG_RELOCATABLE=y).
1277 For more details see Documentation/kdump/kdump.txt
1278
Huang Ying3ab83522008-07-25 19:45:07 -07001279config KEXEC_JUMP
1280 bool "kexec jump (EXPERIMENTAL)"
1281 depends on EXPERIMENTAL
Huang Ying89081d12008-07-25 19:45:10 -07001282 depends on KEXEC && HIBERNATION && X86_32
Huang Ying3ab83522008-07-25 19:45:07 -07001283 help
Huang Ying89081d12008-07-25 19:45:10 -07001284 Jump between original kernel and kexeced kernel and invoke
1285 code in physical address mode via KEXEC
Huang Ying3ab83522008-07-25 19:45:07 -07001286
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001287config PHYSICAL_START
1288 hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
1289 default "0x1000000" if X86_NUMAQ
1290 default "0x200000" if X86_64
1291 default "0x100000"
1292 help
1293 This gives the physical address where the kernel is loaded.
1294
1295 If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
1296 bzImage will decompress itself to above physical address and
1297 run from there. Otherwise, bzImage will run from the address where
1298 it has been loaded by the boot loader and will ignore above physical
1299 address.
1300
1301 In normal kdump cases one does not have to set/change this option
1302 as now bzImage can be compiled as a completely relocatable image
1303 (CONFIG_RELOCATABLE=y) and be used to load and run from a different
1304 address. This option is mainly useful for the folks who don't want
1305 to use a bzImage for capturing the crash dump and want to use a
1306 vmlinux instead. vmlinux is not relocatable hence a kernel needs
1307 to be specifically compiled to run from a specific memory area
1308 (normally a reserved region) and this option comes handy.
1309
1310 So if you are using bzImage for capturing the crash dump, leave
1311 the value here unchanged to 0x100000 and set CONFIG_RELOCATABLE=y.
1312 Otherwise if you plan to use vmlinux for capturing the crash dump
1313 change this value to start of the reserved region (Typically 16MB
1314 0x1000000). In other words, it can be set based on the "X" value as
1315 specified in the "crashkernel=YM@XM" command line boot parameter
1316 passed to the panic-ed kernel. Typically this parameter is set as
1317 crashkernel=64M@16M. Please take a look at
1318 Documentation/kdump/kdump.txt for more details about crash dumps.
1319
1320 Usage of bzImage for capturing the crash dump is recommended as
1321 one does not have to build two kernels. Same kernel can be used
1322 as production kernel and capture kernel. Above option should have
1323 gone away after relocatable bzImage support is introduced. But it
1324 is present because there are users out there who continue to use
1325 vmlinux for dump capture. This option should go away down the
1326 line.
1327
1328 Don't change this unless you know what you are doing.
1329
1330config RELOCATABLE
1331 bool "Build a relocatable kernel (EXPERIMENTAL)"
1332 depends on EXPERIMENTAL
1333 help
1334 This builds a kernel image that retains relocation information
1335 so it can be loaded someplace besides the default 1MB.
1336 The relocations tend to make the kernel binary about 10% larger,
1337 but are discarded at runtime.
1338
1339 One use is for the kexec on panic case where the recovery kernel
1340 must live at a different physical address than the primary
1341 kernel.
1342
1343 Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
1344 it has been loaded at and the compile time physical address
1345 (CONFIG_PHYSICAL_START) is ignored.
1346
1347config PHYSICAL_ALIGN
1348 hex
1349 prompt "Alignment value to which kernel should be aligned" if X86_32
1350 default "0x100000" if X86_32
1351 default "0x200000" if X86_64
1352 range 0x2000 0x400000
1353 help
1354 This value puts the alignment restrictions on physical address
1355 where kernel is loaded and run from. Kernel is compiled for an
1356 address which meets above alignment restriction.
1357
1358 If bootloader loads the kernel at a non-aligned address and
1359 CONFIG_RELOCATABLE is set, kernel will move itself to nearest
1360 address aligned to above value and run from there.
1361
1362 If bootloader loads the kernel at a non-aligned address and
1363 CONFIG_RELOCATABLE is not set, kernel will ignore the run time
1364 load address and decompress itself to the address it has been
1365 compiled for and run from there. The address for which kernel is
1366 compiled already meets above alignment restrictions. Hence the
1367 end result is that kernel runs from a physical address meeting
1368 above alignment restrictions.
1369
1370 Don't change this unless you know what you are doing.
1371
1372config HOTPLUG_CPU
1373 bool "Support for suspend on SMP and hot-pluggable CPUs (EXPERIMENTAL)"
1374 depends on SMP && HOTPLUG && EXPERIMENTAL && !X86_VOYAGER
1375 ---help---
1376 Say Y here to experiment with turning CPUs off and on, and to
1377 enable suspend on SMP systems. CPUs can be controlled through
1378 /sys/devices/system/cpu.
1379 Say N if you want to disable CPU hotplug and don't need to
1380 suspend.
1381
1382config COMPAT_VDSO
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001383 def_bool y
1384 prompt "Compat VDSO support"
Roland McGrathaf65d642008-01-30 13:30:43 +01001385 depends on X86_32 || IA32_EMULATION
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001386 help
Roland McGrathaf65d642008-01-30 13:30:43 +01001387 Map the 32-bit VDSO to the predictable old-style address too.
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001388 ---help---
1389 Say N here if you are running a sufficiently recent glibc
1390 version (2.3.3 or later), to remove the high-mapped
1391 VDSO mapping and to exclusively use the randomized VDSO.
1392
1393 If unsure, say Y.
1394
1395endmenu
1396
1397config ARCH_ENABLE_MEMORY_HOTPLUG
1398 def_bool y
1399 depends on X86_64 || (X86_32 && HIGHMEM)
1400
Sam Ravnborg506f1d02007-11-09 21:56:54 +01001401config HAVE_ARCH_EARLY_PFN_TO_NID
1402 def_bool X86_64
1403 depends on NUMA
1404
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001405menu "Power management options"
1406 depends on !X86_VOYAGER
1407
1408config ARCH_HIBERNATION_HEADER
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001409 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001410 depends on X86_64 && HIBERNATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001411
1412source "kernel/power/Kconfig"
1413
1414source "drivers/acpi/Kconfig"
1415
Andi Kleena6b68072008-01-30 13:32:49 +01001416config X86_APM_BOOT
1417 bool
1418 default y
1419 depends on APM || APM_MODULE
1420
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001421menuconfig APM
1422 tristate "APM (Advanced Power Management) BIOS support"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001423 depends on X86_32 && PM_SLEEP
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001424 ---help---
1425 APM is a BIOS specification for saving power using several different
1426 techniques. This is mostly useful for battery powered laptops with
1427 APM compliant BIOSes. If you say Y here, the system time will be
1428 reset after a RESUME operation, the /proc/apm device will provide
1429 battery status information, and user-space programs will receive
1430 notification of APM "events" (e.g. battery status change).
1431
1432 If you select "Y" here, you can disable actual use of the APM
1433 BIOS by passing the "apm=off" option to the kernel at boot time.
1434
1435 Note that the APM support is almost completely disabled for
1436 machines with more than one CPU.
1437
1438 In order to use APM, you will need supporting software. For location
Randy Dunlap53471122008-03-12 18:10:51 -04001439 and more information, read <file:Documentation/power/pm.txt> and the
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001440 Battery Powered Linux mini-HOWTO, available from
1441 <http://www.tldp.org/docs.html#howto>.
1442
1443 This driver does not spin down disk drives (see the hdparm(8)
1444 manpage ("man 8 hdparm") for that), and it doesn't turn off
1445 VESA-compliant "green" monitors.
1446
1447 This driver does not support the TI 4000M TravelMate and the ACER
1448 486/DX4/75 because they don't have compliant BIOSes. Many "green"
1449 desktop machines also don't have compliant BIOSes, and this driver
1450 may cause those machines to panic during the boot phase.
1451
1452 Generally, if you don't have a battery in your machine, there isn't
1453 much point in using this driver and you should say N. If you get
1454 random kernel OOPSes or reboots that don't seem to be related to
1455 anything, try disabling/enabling this option (or disabling/enabling
1456 APM in your BIOS).
1457
1458 Some other things you should try when experiencing seemingly random,
1459 "weird" problems:
1460
1461 1) make sure that you have enough swap space and that it is
1462 enabled.
1463 2) pass the "no-hlt" option to the kernel
1464 3) switch on floating point emulation in the kernel and pass
1465 the "no387" option to the kernel
1466 4) pass the "floppy=nodma" option to the kernel
1467 5) pass the "mem=4M" option to the kernel (thereby disabling
1468 all but the first 4 MB of RAM)
1469 6) make sure that the CPU is not over clocked.
1470 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
1471 8) disable the cache from your BIOS settings
1472 9) install a fan for the video card or exchange video RAM
1473 10) install a better fan for the CPU
1474 11) exchange RAM chips
1475 12) exchange the motherboard.
1476
1477 To compile this driver as a module, choose M here: the
1478 module will be called apm.
1479
1480if APM
1481
1482config APM_IGNORE_USER_SUSPEND
1483 bool "Ignore USER SUSPEND"
1484 help
1485 This option will ignore USER SUSPEND requests. On machines with a
1486 compliant APM BIOS, you want to say N. However, on the NEC Versa M
1487 series notebooks, it is necessary to say Y because of a BIOS bug.
1488
1489config APM_DO_ENABLE
1490 bool "Enable PM at boot time"
1491 ---help---
1492 Enable APM features at boot time. From page 36 of the APM BIOS
1493 specification: "When disabled, the APM BIOS does not automatically
1494 power manage devices, enter the Standby State, enter the Suspend
1495 State, or take power saving steps in response to CPU Idle calls."
1496 This driver will make CPU Idle calls when Linux is idle (unless this
1497 feature is turned off -- see "Do CPU IDLE calls", below). This
1498 should always save battery power, but more complicated APM features
1499 will be dependent on your BIOS implementation. You may need to turn
1500 this option off if your computer hangs at boot time when using APM
1501 support, or if it beeps continuously instead of suspending. Turn
1502 this off if you have a NEC UltraLite Versa 33/C or a Toshiba
1503 T400CDT. This is off by default since most machines do fine without
1504 this feature.
1505
1506config APM_CPU_IDLE
1507 bool "Make CPU Idle calls when idle"
1508 help
1509 Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
1510 On some machines, this can activate improved power savings, such as
1511 a slowed CPU clock rate, when the machine is idle. These idle calls
1512 are made after the idle loop has run for some length of time (e.g.,
1513 333 mS). On some machines, this will cause a hang at boot time or
1514 whenever the CPU becomes idle. (On machines with more than one CPU,
1515 this option does nothing.)
1516
1517config APM_DISPLAY_BLANK
1518 bool "Enable console blanking using APM"
1519 help
1520 Enable console blanking using the APM. Some laptops can use this to
1521 turn off the LCD backlight when the screen blanker of the Linux
1522 virtual console blanks the screen. Note that this is only used by
1523 the virtual console screen blanker, and won't turn off the backlight
1524 when using the X Window system. This also doesn't have anything to
1525 do with your VESA-compliant power-saving monitor. Further, this
1526 option doesn't work for all laptops -- it might not turn off your
1527 backlight at all, or it might print a lot of errors to the console,
1528 especially if you are using gpm.
1529
1530config APM_ALLOW_INTS
1531 bool "Allow interrupts during APM BIOS calls"
1532 help
1533 Normally we disable external interrupts while we are making calls to
1534 the APM BIOS as a measure to lessen the effects of a badly behaving
1535 BIOS implementation. The BIOS should reenable interrupts if it
1536 needs to. Unfortunately, some BIOSes do not -- especially those in
1537 many of the newer IBM Thinkpads. If you experience hangs when you
1538 suspend, try setting this to Y. Otherwise, say N.
1539
1540config APM_REAL_MODE_POWER_OFF
1541 bool "Use real mode APM BIOS call to power off"
1542 help
1543 Use real mode APM BIOS calls to switch off the computer. This is
1544 a work-around for a number of buggy BIOSes. Switch this option on if
1545 your computer crashes instead of powering off properly.
1546
1547endif # APM
1548
1549source "arch/x86/kernel/cpu/cpufreq/Kconfig"
1550
1551source "drivers/cpuidle/Kconfig"
1552
1553endmenu
1554
1555
1556menu "Bus options (PCI etc.)"
1557
1558config PCI
Ingo Molnar1ac97012008-05-19 14:10:14 +02001559 bool "PCI support"
Adrian Bunk1c858082008-01-30 13:32:32 +01001560 default y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001561 select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
1562 help
1563 Find out whether you have a PCI motherboard. PCI is the name of a
1564 bus system, i.e. the way the CPU talks to the other stuff inside
1565 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1566 VESA. If you have PCI, say Y, otherwise N.
1567
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001568choice
1569 prompt "PCI access mode"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001570 depends on X86_32 && PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001571 default PCI_GOANY
1572 ---help---
1573 On PCI systems, the BIOS can be used to detect the PCI devices and
1574 determine their configuration. However, some old PCI motherboards
1575 have BIOS bugs and may crash if this is done. Also, some embedded
1576 PCI-based systems don't have any BIOS at all. Linux can also try to
1577 detect the PCI hardware directly without using the BIOS.
1578
1579 With this option, you can specify how Linux should detect the
1580 PCI devices. If you choose "BIOS", the BIOS will be used,
1581 if you choose "Direct", the BIOS won't be used, and if you
1582 choose "MMConfig", then PCI Express MMCONFIG will be used.
1583 If you choose "Any", the kernel will try MMCONFIG, then the
1584 direct access method and falls back to the BIOS if that doesn't
1585 work. If unsure, go with the default, which is "Any".
1586
1587config PCI_GOBIOS
1588 bool "BIOS"
1589
1590config PCI_GOMMCONFIG
1591 bool "MMConfig"
1592
1593config PCI_GODIRECT
1594 bool "Direct"
1595
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001596config PCI_GOOLPC
1597 bool "OLPC"
1598 depends on OLPC
1599
Andres Salomon2bdd1b02008-06-05 14:14:41 -07001600config PCI_GOANY
1601 bool "Any"
1602
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001603endchoice
1604
1605config PCI_BIOS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001606 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001607 depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001608
1609# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
1610config PCI_DIRECT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001611 def_bool y
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001612 depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001613
1614config PCI_MMCONFIG
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001615 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001616 depends on X86_32 && PCI && ACPI && (PCI_GOMMCONFIG || PCI_GOANY)
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001617
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001618config PCI_OLPC
Andres Salomon2bdd1b02008-06-05 14:14:41 -07001619 def_bool y
1620 depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001621
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001622config PCI_DOMAINS
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001623 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001624 depends on PCI
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001625
1626config PCI_MMCONFIG
1627 bool "Support mmconfig PCI config space access"
1628 depends on X86_64 && PCI && ACPI
1629
1630config DMAR
1631 bool "Support for DMA Remapping Devices (EXPERIMENTAL)"
1632 depends on X86_64 && PCI_MSI && ACPI && EXPERIMENTAL
1633 help
1634 DMA remapping (DMAR) devices support enables independent address
1635 translations for Direct Memory Access (DMA) from devices.
1636 These DMA remapping devices are reported via ACPI tables
1637 and include PCI device scope covered by these DMA
1638 remapping devices.
1639
1640config DMAR_GFX_WA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001641 def_bool y
1642 prompt "Support for Graphics workaround"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001643 depends on DMAR
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001644 help
1645 Current Graphics drivers tend to use physical address
1646 for DMA and avoid using DMA APIs. Setting this config
1647 option permits the IOMMU driver to set a unity map for
1648 all the OS-visible memory. Hence the driver can continue
1649 to use physical addresses for DMA.
1650
1651config DMAR_FLOPPY_WA
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001652 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001653 depends on DMAR
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001654 help
1655 Floppy disk drivers are know to bypass DMA API calls
1656 thereby failing to work when IOMMU is enabled. This
1657 workaround will setup a 1:1 mapping for the first
1658 16M to make floppy (an ISA device) work.
1659
1660source "drivers/pci/pcie/Kconfig"
1661
1662source "drivers/pci/Kconfig"
1663
1664# x86_64 have no ISA slots, but do have ISA-style DMA.
1665config ISA_DMA_API
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001666 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001667
1668if X86_32
1669
1670config ISA
1671 bool "ISA support"
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001672 depends on !X86_VOYAGER
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001673 help
1674 Find out whether you have ISA slots on your motherboard. ISA is the
1675 name of a bus system, i.e. the way the CPU talks to the other stuff
1676 inside your box. Other bus systems are PCI, EISA, MicroChannel
1677 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1678 newer boards don't support it. If you have ISA, say Y, otherwise N.
1679
1680config EISA
1681 bool "EISA support"
1682 depends on ISA
1683 ---help---
1684 The Extended Industry Standard Architecture (EISA) bus was
1685 developed as an open alternative to the IBM MicroChannel bus.
1686
1687 The EISA bus provided some of the features of the IBM MicroChannel
1688 bus while maintaining backward compatibility with cards made for
1689 the older ISA bus. The EISA bus saw limited use between 1988 and
1690 1995 when it was made obsolete by the PCI bus.
1691
1692 Say Y here if you are building a kernel for an EISA-based machine.
1693
1694 Otherwise, say N.
1695
1696source "drivers/eisa/Kconfig"
1697
1698config MCA
Ingo Molnarefefa6f2008-07-10 16:09:50 +02001699 bool "MCA support" if !X86_VOYAGER
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001700 default y if X86_VOYAGER
1701 help
1702 MicroChannel Architecture is found in some IBM PS/2 machines and
1703 laptops. It is a bus system similar to PCI or ISA. See
1704 <file:Documentation/mca.txt> (and especially the web page given
1705 there) before attempting to build an MCA bus kernel.
1706
1707source "drivers/mca/Kconfig"
1708
1709config SCx200
1710 tristate "NatSemi SCx200 support"
1711 depends on !X86_VOYAGER
1712 help
1713 This provides basic support for National Semiconductor's
1714 (now AMD's) Geode processors. The driver probes for the
1715 PCI-IDs of several on-chip devices, so its a good dependency
1716 for other scx200_* drivers.
1717
1718 If compiled as a module, the driver is named scx200.
1719
1720config SCx200HR_TIMER
1721 tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
1722 depends on SCx200 && GENERIC_TIME
1723 default y
1724 help
1725 This driver provides a clocksource built upon the on-chip
1726 27MHz high-resolution timer. Its also a workaround for
1727 NSC Geode SC-1100's buggy TSC, which loses time when the
1728 processor goes idle (as is done by the scheduler). The
1729 other workaround is idle=poll boot option.
1730
1731config GEODE_MFGPT_TIMER
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001732 def_bool y
1733 prompt "Geode Multi-Function General Purpose Timer (MFGPT) events"
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001734 depends on MGEODE_LX && GENERIC_TIME && GENERIC_CLOCKEVENTS
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001735 help
1736 This driver provides a clock event source based on the MFGPT
1737 timer(s) in the CS5535 and CS5536 companion chip for the geode.
1738 MFGPTs have a better resolution and max interval than the
1739 generic PIT, and are suitable for use as high-res timers.
1740
Andres Salomon3ef0e1f2008-04-29 00:59:53 -07001741config OLPC
1742 bool "One Laptop Per Child support"
1743 default n
1744 help
1745 Add support for detecting the unique features of the OLPC
1746 XO hardware.
1747
Sam Ravnborgbc0120f2007-11-06 23:10:39 +01001748endif # X86_32
1749
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001750config K8_NB
1751 def_bool y
Sam Ravnborgbc0120f2007-11-06 23:10:39 +01001752 depends on AGP_AMD64 || (X86_64 && (GART_IOMMU || (PCI && NUMA)))
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001753
1754source "drivers/pcmcia/Kconfig"
1755
1756source "drivers/pci/hotplug/Kconfig"
1757
1758endmenu
1759
1760
1761menu "Executable file formats / Emulations"
1762
1763source "fs/Kconfig.binfmt"
1764
1765config IA32_EMULATION
1766 bool "IA32 Emulation"
1767 depends on X86_64
Roland McGratha97f52e2008-01-30 13:31:55 +01001768 select COMPAT_BINFMT_ELF
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001769 help
1770 Include code to run 32-bit programs under a 64-bit kernel. You should
1771 likely turn this on, unless you're 100% sure that you don't have any
1772 32-bit programs left.
1773
1774config IA32_AOUT
1775 tristate "IA32 a.out support"
David Howellsb0b933c2008-02-08 04:19:27 -08001776 depends on IA32_EMULATION && ARCH_SUPPORTS_AOUT
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001777 help
1778 Support old a.out binaries in the 32bit emulation.
1779
1780config COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001781 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001782 depends on IA32_EMULATION
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001783
1784config COMPAT_FOR_U64_ALIGNMENT
1785 def_bool COMPAT
1786 depends on X86_64
1787
1788config SYSVIPC_COMPAT
Harvey Harrison3c2362e2008-01-30 13:31:03 +01001789 def_bool y
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001790 depends on X86_64 && COMPAT && SYSVIPC
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001791
1792endmenu
1793
1794
1795source "net/Kconfig"
1796
1797source "drivers/Kconfig"
1798
1799source "drivers/firmware/Kconfig"
1800
1801source "fs/Kconfig"
1802
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001803source "arch/x86/Kconfig.debug"
1804
1805source "security/Kconfig"
1806
1807source "crypto/Kconfig"
1808
Avi Kivityedf88412007-12-16 11:02:48 +02001809source "arch/x86/kvm/Kconfig"
1810
Sam Ravnborge279b6c2007-11-06 20:41:05 +01001811source "lib/Kconfig"