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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#
2# For a description of the syntax of this configuration file,
3# see Documentation/kbuild/kconfig-language.txt.
4#
5# Note: ISA is disabled and will hopefully never be enabled.
6# If you managed to buy an ISA x86-64 box you'll have to fix all the
7# ISA drivers you need yourself.
8#
9
10mainmenu "Linux Kernel Configuration"
11
12config X86_64
13 bool
14 default y
15 help
16 Port to the x86-64 architecture. x86-64 is a 64-bit extension to the
17 classical 32-bit x86 architecture. For details see
18 <http://www.x86-64.org/>.
19
20config 64BIT
21 def_bool y
22
23config X86
24 bool
25 default y
26
27config MMU
28 bool
29 default y
30
31config ISA
32 bool
33
34config SBUS
35 bool
36
37config RWSEM_GENERIC_SPINLOCK
38 bool
39 default y
40
41config RWSEM_XCHGADD_ALGORITHM
42 bool
43
44config GENERIC_CALIBRATE_DELAY
45 bool
46 default y
47
48config X86_CMPXCHG
49 bool
50 default y
51
52config EARLY_PRINTK
53 bool
54 default y
55
56config GENERIC_ISA_DMA
57 bool
58 default y
59
60config GENERIC_IOMAP
61 bool
62 default y
63
64source "init/Kconfig"
65
66
67menu "Processor type and features"
68
69choice
70 prompt "Processor family"
71 default MK8
72
73config MK8
74 bool "AMD-Opteron/Athlon64"
75 help
76 Optimize for AMD Opteron/Athlon64/Hammer/K8 CPUs.
77
78config MPSC
79 bool "Intel EM64T"
80 help
81 Optimize for Intel Pentium 4 and Xeon CPUs with Intel
82 Extended Memory 64 Technology(EM64T). For details see
83 <http://www.intel.com/technology/64bitextensions/>.
84
85config GENERIC_CPU
86 bool "Generic-x86-64"
87 help
88 Generic x86-64 CPU.
89
90endchoice
91
92#
93# Define implied options from the CPU selection here
94#
95config X86_L1_CACHE_BYTES
96 int
97 default "128" if GENERIC_CPU || MPSC
98 default "64" if MK8
99
100config X86_L1_CACHE_SHIFT
101 int
102 default "7" if GENERIC_CPU || MPSC
103 default "6" if MK8
104
105config X86_TSC
106 bool
107 default y
108
109config X86_GOOD_APIC
110 bool
111 default y
112
113config MICROCODE
114 tristate "/dev/cpu/microcode - Intel CPU microcode support"
115 ---help---
116 If you say Y here the 'File systems' section, you will be
117 able to update the microcode on Intel processors. You will
118 obviously need the actual microcode binary data itself which is
119 not shipped with the Linux kernel.
120
121 For latest news and information on obtaining all the required
122 ingredients for this driver, check:
123 <http://www.urbanmyth.org/microcode/>.
124
125 To compile this driver as a module, choose M here: the
126 module will be called microcode.
127 If you use modprobe or kmod you may also want to add the line
128 'alias char-major-10-184 microcode' to your /etc/modules.conf file.
129
130config X86_MSR
131 tristate "/dev/cpu/*/msr - Model-specific register support"
132 help
133 This device gives privileged processes access to the x86
134 Model-Specific Registers (MSRs). It is a character device with
135 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
136 MSR accesses are directed to a specific CPU on multi-processor
137 systems.
138
139config X86_CPUID
140 tristate "/dev/cpu/*/cpuid - CPU information support"
141 help
142 This device gives processes access to the x86 CPUID instruction to
143 be executed on a specific processor. It is a character device
144 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
145 /dev/cpu/31/cpuid.
146
147# disable it for opteron optimized builds because it pulls in ACPI_BOOT
148config X86_HT
149 bool
150 depends on SMP && !MK8
151 default y
152
153config MATH_EMULATION
154 bool
155
156config MCA
157 bool
158
159config EISA
160 bool
161
162config X86_IO_APIC
163 bool
164 default y
165
166config X86_LOCAL_APIC
167 bool
168 default y
169
170config MTRR
171 bool "MTRR (Memory Type Range Register) support"
172 ---help---
173 On Intel P6 family processors (Pentium Pro, Pentium II and later)
174 the Memory Type Range Registers (MTRRs) may be used to control
175 processor access to memory ranges. This is most useful if you have
176 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
177 allows bus write transfers to be combined into a larger transfer
178 before bursting over the PCI/AGP bus. This can increase performance
179 of image write operations 2.5 times or more. Saying Y here creates a
180 /proc/mtrr file which may be used to manipulate your processor's
181 MTRRs. Typically the X server should use this.
182
183 This code has a reasonably generic interface so that similar
184 control registers on other processors can be easily supported
185 as well.
186
187 Saying Y here also fixes a problem with buggy SMP BIOSes which only
188 set the MTRRs for the boot CPU and not for the secondary CPUs. This
189 can lead to all sorts of problems, so it's good to say Y here.
190
191 Just say Y here, all x86-64 machines support MTRRs.
192
193 See <file:Documentation/mtrr.txt> for more information.
194
195config SMP
196 bool "Symmetric multi-processing support"
197 ---help---
198 This enables support for systems with more than one CPU. If you have
199 a system with only one CPU, like most personal computers, say N. If
200 you have a system with more than one CPU, say Y.
201
202 If you say N here, the kernel will run on single and multiprocessor
203 machines, but will use only one CPU of a multiprocessor machine. If
204 you say Y here, the kernel will run on many, but not all,
205 singleprocessor machines. On a singleprocessor machine, the kernel
206 will run faster if you say N here.
207
208 If you don't know what to do here, say N.
209
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210config SCHED_SMT
211 bool "SMT (Hyperthreading) scheduler support"
212 depends on SMP
213 default n
214 help
215 SMT scheduler support improves the CPU scheduler's decision making
216 when dealing with Intel Pentium 4 chips with HyperThreading at a
217 cost of slightly increased overhead in some places. If unsure say
218 N here.
219
Ingo Molnarcc19ca82005-06-25 14:57:36 -0700220source "kernel/Kconfig.preempt"
221
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222config K8_NUMA
223 bool "K8 NUMA support"
224 select NUMA
225 depends on SMP
226 help
227 Enable NUMA (Non Unified Memory Architecture) support for
228 AMD Opteron Multiprocessor systems. The kernel will try to allocate
229 memory used by a CPU on the local memory controller of the CPU
230 and add some more NUMA awareness to the kernel.
231 This code is recommended on all multiprocessor Opteron systems
232 and normally doesn't hurt on others.
233
234config NUMA_EMU
235 bool "NUMA emulation support"
236 select NUMA
237 depends on SMP
238 help
239 Enable NUMA emulation. A flat machine will be split
240 into virtual nodes when booted with "numa=fake=N", where N is the
241 number of nodes. This is only useful for debugging.
242
Dave Hansen3f22ab22005-06-23 00:07:43 -0700243config ARCH_DISCONTIGMEM_ENABLE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 bool
245 depends on NUMA
246 default y
247
248config NUMA
249 bool
250 default n
251
Matt Tolentino1035faf2005-06-23 00:08:05 -0700252config ARCH_DISCONTIGMEM_ENABLE
253 def_bool y
254 depends on NUMA
255
256config ARCH_DISCONTIGMEM_DEFAULT
257 def_bool y
258 depends on NUMA
259
260config ARCH_SPARSEMEM_ENABLE
261 def_bool y
262 depends on NUMA
263
264config ARCH_FLATMEM_ENABLE
265 def_bool y
266 depends on !NUMA
267
Dave Hansen3f22ab22005-06-23 00:07:43 -0700268source "mm/Kconfig"
269
Matt Tolentino1035faf2005-06-23 00:08:05 -0700270config HAVE_ARCH_EARLY_PFN_TO_NID
271 def_bool y
272
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273config HAVE_DEC_LOCK
274 bool
275 depends on SMP
276 default y
277
278config NR_CPUS
279 int "Maximum number of CPUs (2-256)"
280 range 2 256
281 depends on SMP
282 default "8"
283 help
284 This allows you to specify the maximum number of CPUs which this
285 kernel will support. Current maximum is 256 CPUs due to
286 APIC addressing limits. Less depending on the hardware.
287
288 This is purely to save memory - each supported CPU requires
289 memory in the static kernel configuration.
290
Ashok Raj76e4f662005-06-25 14:55:00 -0700291config HOTPLUG_CPU
292 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
293 depends on SMP && HOTPLUG && EXPERIMENTAL
294 help
295 Say Y here to experiment with turning CPUs off and on. CPUs
296 can be controlled through /sys/devices/system/cpu/cpu#.
297 Say N if you want to disable CPU hotplug.
298
299
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300config HPET_TIMER
301 bool
302 default y
303 help
304 Use the IA-PC HPET (High Precision Event Timer) to manage
305 time in preference to the PIT and RTC, if a HPET is
306 present. The HPET provides a stable time base on SMP
307 systems, unlike the TSC, but it is more expensive to access,
308 as it is off-chip. You can find the HPET spec at
309 <http://www.intel.com/labs/platcomp/hpet/hpetspec.htm>.
310
Andi Kleen312df5f2005-05-16 21:53:28 -0700311config X86_PM_TIMER
312 bool "PM timer"
Andi Kleen9c2be6a2005-05-31 14:39:26 -0700313 depends on ACPI
Andi Kleen312df5f2005-05-16 21:53:28 -0700314 default y
315 help
316 Support the ACPI PM timer for time keeping. This is slow,
317 but is useful on some chipsets without HPET on systems with more
318 than one CPU. On a single processor or single socket multi core
319 system it is normally not required.
320 When the PM timer is active 64bit vsyscalls are disabled
321 and should not be enabled (/proc/sys/kernel/vsyscall64 should
322 not be changed).
323 The kernel selects the PM timer only as a last resort, so it is
324 useful to enable just in case.
325
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326config HPET_EMULATE_RTC
327 bool "Provide RTC interrupt"
328 depends on HPET_TIMER && RTC=y
329
330config GART_IOMMU
331 bool "IOMMU support"
332 depends on PCI
333 help
334 Support the K8 IOMMU. Needed to run systems with more than 4GB of memory
335 properly with 32-bit PCI devices that do not support DAC (Double Address
336 Cycle). The IOMMU can be turned off at runtime with the iommu=off parameter.
337 Normally the kernel will take the right choice by itself.
338 If unsure, say Y.
339
340# need this always enabled with GART_IOMMU for the VIA workaround
341config SWIOTLB
342 bool
343 depends on GART_IOMMU
344 default y
345
346config DUMMY_IOMMU
347 bool
348 depends on !GART_IOMMU && !SWIOTLB
349 default y
350 help
351 Don't use IOMMU code. This will cause problems when you have more than 4GB
352 of memory and any 32-bit devices. Don't turn on unless you know what you
353 are doing.
354
355config X86_MCE
356 bool "Machine check support" if EMBEDDED
357 default y
358 help
359 Include a machine check error handler to report hardware errors.
360 This version will require the mcelog utility to decode some
361 machine check error logs. See
362 ftp://ftp.x86-64.org/pub/linux/tools/mcelog
363
364config X86_MCE_INTEL
365 bool "Intel MCE features"
366 depends on X86_MCE && X86_LOCAL_APIC
367 default y
368 help
369 Additional support for intel specific MCE features such as
370 the thermal monitor.
371
372config SECCOMP
373 bool "Enable seccomp to safely compute untrusted bytecode"
374 depends on PROC_FS
375 default y
376 help
377 This kernel feature is useful for number crunching applications
378 that may need to compute untrusted bytecode during their
379 execution. By using pipes or other transports made available to
380 the process as file descriptors supporting the read/write
381 syscalls, it's possible to isolate those applications in
382 their own address space using seccomp. Once seccomp is
383 enabled via /proc/<pid>/seccomp, it cannot be disabled
384 and the task is only allowed to execute a few safe syscalls
385 defined by each seccomp mode.
386
387 If unsure, say Y. Only embedded should say N here.
388
Christoph Lameter59121002005-06-23 00:08:25 -0700389source kernel/Kconfig.hz
390
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391endmenu
392
393#
394# Use the generic interrupt handling code in kernel/irq/:
395#
396config GENERIC_HARDIRQS
397 bool
398 default y
399
400config GENERIC_IRQ_PROBE
401 bool
402 default y
403
Al Viro5cae8412005-05-04 05:39:22 +0100404# we have no ISA slots, but we do have ISA-style DMA.
405config ISA_DMA_API
406 bool
407 default y
408
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409menu "Power management options"
410
411source kernel/power/Kconfig
412
413source "drivers/acpi/Kconfig"
414
415source "arch/x86_64/kernel/cpufreq/Kconfig"
416
417endmenu
418
419menu "Bus options (PCI etc.)"
420
421config PCI
422 bool "PCI support"
423
424# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
425config PCI_DIRECT
426 bool
427 depends on PCI
428 default y
429
430config PCI_MMCONFIG
431 bool "Support mmconfig PCI config space access"
Alexander Nyberg8aadff72005-05-27 12:48:50 +0200432 depends on PCI && ACPI
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 select ACPI_BOOT
434
435config UNORDERED_IO
436 bool "Unordered IO mapping access"
437 depends on EXPERIMENTAL
438 help
439 Use unordered stores to access IO memory mappings in device drivers.
440 Still very experimental. When a driver works on IA64/ppc64/pa-risc it should
441 work with this option, but it makes the drivers behave differently
442 from i386. Requires that the driver writer used memory barriers
443 properly.
444
445source "drivers/pci/pcie/Kconfig"
446
447source "drivers/pci/Kconfig"
448
449source "drivers/pcmcia/Kconfig"
450
451source "drivers/pci/hotplug/Kconfig"
452
453endmenu
454
455
456menu "Executable file formats / Emulations"
457
458source "fs/Kconfig.binfmt"
459
460config IA32_EMULATION
461 bool "IA32 Emulation"
462 help
463 Include code to run 32-bit programs under a 64-bit kernel. You should likely
464 turn this on, unless you're 100% sure that you don't have any 32-bit programs
465 left.
466
467config IA32_AOUT
468 bool "IA32 a.out support"
469 depends on IA32_EMULATION
470 help
471 Support old a.out binaries in the 32bit emulation.
472
473config COMPAT
474 bool
475 depends on IA32_EMULATION
476 default y
477
478config SYSVIPC_COMPAT
479 bool
480 depends on COMPAT && SYSVIPC
481 default y
482
483config UID16
484 bool
485 depends on IA32_EMULATION
486 default y
487
488endmenu
489
490source drivers/Kconfig
491
492source "drivers/firmware/Kconfig"
493
494source fs/Kconfig
495
496source "arch/x86_64/oprofile/Kconfig"
497
498source "arch/x86_64/Kconfig.debug"
499
500source "security/Kconfig"
501
502source "crypto/Kconfig"
503
504source "lib/Kconfig"