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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
Benjamin LaHaise52fdd082005-09-03 15:56:52 -070027config SEMAPHORE_SLEEPERS
28 bool
29 default y
30
Linus Torvalds1da177e2005-04-16 15:20:36 -070031config MMU
32 bool
33 default y
34
35config ISA
36 bool
37
38config SBUS
39 bool
40
41config RWSEM_GENERIC_SPINLOCK
42 bool
43 default y
44
45config RWSEM_XCHGADD_ALGORITHM
46 bool
47
Akinobu Mitaf33e2fb2006-03-26 01:39:42 -080048config GENERIC_HWEIGHT
49 bool
50 default y
51
Linus Torvalds1da177e2005-04-16 15:20:36 -070052config GENERIC_CALIBRATE_DELAY
53 bool
54 default y
55
56config X86_CMPXCHG
57 bool
58 default y
59
60config EARLY_PRINTK
61 bool
62 default y
63
64config GENERIC_ISA_DMA
65 bool
66 default y
67
68config GENERIC_IOMAP
69 bool
70 default y
71
viro@ZenIV.linux.org.uka08b6b72005-09-06 01:48:42 +010072config ARCH_MAY_HAVE_PC_FDC
73 bool
74 default y
75
Andi Kleene9928672006-01-11 22:43:33 +010076config DMI
77 bool
78 default y
79
Linus Torvalds1da177e2005-04-16 15:20:36 -070080source "init/Kconfig"
81
82
83menu "Processor type and features"
84
85choice
Ravikiran G Thirumalai79f12612006-01-11 22:46:18 +010086 prompt "Subarchitecture Type"
87 default X86_PC
88
89config X86_PC
90 bool "PC-compatible"
91 help
92 Choose this option if your computer is a standard PC or compatible.
93
94config X86_VSMP
95 bool "Support for ScaleMP vSMP"
96 help
97 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
98 supposed to run on these EM64T-based machines. Only choose this option
99 if you have one of these machines.
100
101endchoice
102
103choice
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 prompt "Processor family"
105 default MK8
106
107config MK8
108 bool "AMD-Opteron/Athlon64"
109 help
110 Optimize for AMD Opteron/Athlon64/Hammer/K8 CPUs.
111
112config MPSC
113 bool "Intel EM64T"
114 help
115 Optimize for Intel Pentium 4 and Xeon CPUs with Intel
116 Extended Memory 64 Technology(EM64T). For details see
117 <http://www.intel.com/technology/64bitextensions/>.
118
119config GENERIC_CPU
120 bool "Generic-x86-64"
121 help
122 Generic x86-64 CPU.
123
124endchoice
125
126#
127# Define implied options from the CPU selection here
128#
129config X86_L1_CACHE_BYTES
130 int
131 default "128" if GENERIC_CPU || MPSC
132 default "64" if MK8
133
134config X86_L1_CACHE_SHIFT
135 int
136 default "7" if GENERIC_CPU || MPSC
137 default "6" if MK8
138
Ravikiran G Thirumalaie405d062006-04-07 19:50:09 +0200139config X86_INTERNODE_CACHE_BYTES
140 int
141 default "4096" if X86_VSMP
142 default X86_L1_CACHE_BYTES if !X86_VSMP
143
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144config X86_TSC
145 bool
146 default y
147
148config X86_GOOD_APIC
149 bool
150 default y
151
152config MICROCODE
153 tristate "/dev/cpu/microcode - Intel CPU microcode support"
154 ---help---
155 If you say Y here the 'File systems' section, you will be
156 able to update the microcode on Intel processors. You will
157 obviously need the actual microcode binary data itself which is
158 not shipped with the Linux kernel.
159
160 For latest news and information on obtaining all the required
161 ingredients for this driver, check:
162 <http://www.urbanmyth.org/microcode/>.
163
164 To compile this driver as a module, choose M here: the
165 module will be called microcode.
166 If you use modprobe or kmod you may also want to add the line
167 'alias char-major-10-184 microcode' to your /etc/modules.conf file.
168
169config X86_MSR
170 tristate "/dev/cpu/*/msr - Model-specific register support"
171 help
172 This device gives privileged processes access to the x86
173 Model-Specific Registers (MSRs). It is a character device with
174 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
175 MSR accesses are directed to a specific CPU on multi-processor
176 systems.
177
178config X86_CPUID
179 tristate "/dev/cpu/*/cpuid - CPU information support"
180 help
181 This device gives processes access to the x86 CPUID instruction to
182 be executed on a specific processor. It is a character device
183 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
184 /dev/cpu/31/cpuid.
185
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186config X86_HT
187 bool
188 depends on SMP && !MK8
189 default y
190
191config MATH_EMULATION
192 bool
193
194config MCA
195 bool
196
197config EISA
198 bool
199
200config X86_IO_APIC
201 bool
202 default y
203
204config X86_LOCAL_APIC
205 bool
206 default y
207
208config MTRR
209 bool "MTRR (Memory Type Range Register) support"
210 ---help---
211 On Intel P6 family processors (Pentium Pro, Pentium II and later)
212 the Memory Type Range Registers (MTRRs) may be used to control
213 processor access to memory ranges. This is most useful if you have
214 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
215 allows bus write transfers to be combined into a larger transfer
216 before bursting over the PCI/AGP bus. This can increase performance
217 of image write operations 2.5 times or more. Saying Y here creates a
218 /proc/mtrr file which may be used to manipulate your processor's
219 MTRRs. Typically the X server should use this.
220
221 This code has a reasonably generic interface so that similar
222 control registers on other processors can be easily supported
223 as well.
224
225 Saying Y here also fixes a problem with buggy SMP BIOSes which only
226 set the MTRRs for the boot CPU and not for the secondary CPUs. This
227 can lead to all sorts of problems, so it's good to say Y here.
228
229 Just say Y here, all x86-64 machines support MTRRs.
230
231 See <file:Documentation/mtrr.txt> for more information.
232
233config SMP
234 bool "Symmetric multi-processing support"
235 ---help---
236 This enables support for systems with more than one CPU. If you have
237 a system with only one CPU, like most personal computers, say N. If
238 you have a system with more than one CPU, say Y.
239
240 If you say N here, the kernel will run on single and multiprocessor
241 machines, but will use only one CPU of a multiprocessor machine. If
242 you say Y here, the kernel will run on many, but not all,
243 singleprocessor machines. On a singleprocessor machine, the kernel
244 will run faster if you say N here.
245
246 If you don't know what to do here, say N.
247
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248config SCHED_SMT
249 bool "SMT (Hyperthreading) scheduler support"
250 depends on SMP
251 default n
252 help
253 SMT scheduler support improves the CPU scheduler's decision making
254 when dealing with Intel Pentium 4 chips with HyperThreading at a
255 cost of slightly increased overhead in some places. If unsure say
256 N here.
257
Siddha, Suresh B1e9f28f2006-03-27 01:15:22 -0800258config SCHED_MC
259 bool "Multi-core scheduler support"
260 depends on SMP
261 default y
262 help
263 Multi-core scheduler support improves the CPU scheduler's decision
264 making when dealing with multi-core CPU chips at a cost of slightly
265 increased overhead in some places. If unsure say N here.
266
Ingo Molnarcc19ca82005-06-25 14:57:36 -0700267source "kernel/Kconfig.preempt"
268
Ravikiran G Thirumalaib0bd35e2005-11-05 17:25:54 +0100269config NUMA
270 bool "Non Uniform Memory Access (NUMA) Support"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 depends on SMP
272 help
Ravikiran G Thirumalaib0bd35e2005-11-05 17:25:54 +0100273 Enable NUMA (Non Uniform Memory Access) support. The kernel
274 will try to allocate memory used by a CPU on the local memory
275 controller of the CPU and add some more NUMA awareness to the kernel.
276 This code is recommended on all multiprocessor Opteron systems.
277 If the system is EM64T, you should say N unless your system is EM64T
278 NUMA.
279
280config K8_NUMA
281 bool "Old style AMD Opteron NUMA detection"
282 depends on NUMA
283 default y
284 help
285 Enable K8 NUMA node topology detection. You should say Y here if
286 you have a multi processor AMD K8 system. This uses an old
287 method to read the NUMA configurtion directly from the builtin
288 Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
289 instead, which also takes priority if both are compiled in.
290
Yasunori Gotoc80d79d2006-04-10 22:53:53 -0700291config NODES_SHIFT
292 int
293 default "6"
294 depends on NEED_MULTIPLE_NODES
295
Ravikiran G Thirumalaib0bd35e2005-11-05 17:25:54 +0100296# Dummy CONFIG option to select ACPI_NUMA from drivers/acpi/Kconfig.
297
298config X86_64_ACPI_NUMA
299 bool "ACPI NUMA detection"
300 depends on NUMA
301 select ACPI
302 select ACPI_NUMA
303 default y
304 help
305 Enable ACPI SRAT based node topology detection.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306
307config NUMA_EMU
Ravikiran G Thirumalaib0bd35e2005-11-05 17:25:54 +0100308 bool "NUMA emulation"
309 depends on NUMA
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 help
311 Enable NUMA emulation. A flat machine will be split
312 into virtual nodes when booted with "numa=fake=N", where N is the
313 number of nodes. This is only useful for debugging.
314
Dave Hansen3f22ab22005-06-23 00:07:43 -0700315config ARCH_DISCONTIGMEM_ENABLE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 bool
317 depends on NUMA
318 default y
319
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320
Matt Tolentino1035faf2005-06-23 00:08:05 -0700321config ARCH_DISCONTIGMEM_ENABLE
322 def_bool y
323 depends on NUMA
324
325config ARCH_DISCONTIGMEM_DEFAULT
326 def_bool y
327 depends on NUMA
328
329config ARCH_SPARSEMEM_ENABLE
330 def_bool y
Matt Tolentino44df75e2006-01-17 07:03:41 +0100331 depends on (NUMA || EXPERIMENTAL)
332
333config ARCH_MEMORY_PROBE
334 def_bool y
335 depends on MEMORY_HOTPLUG
Matt Tolentino1035faf2005-06-23 00:08:05 -0700336
337config ARCH_FLATMEM_ENABLE
338 def_bool y
339 depends on !NUMA
340
Dave Hansen3f22ab22005-06-23 00:07:43 -0700341source "mm/Kconfig"
342
Matt Tolentino1035faf2005-06-23 00:08:05 -0700343config HAVE_ARCH_EARLY_PFN_TO_NID
344 def_bool y
Matt Tolentino44df75e2006-01-17 07:03:41 +0100345 depends on NUMA
Matt Tolentino1035faf2005-06-23 00:08:05 -0700346
KAMEZAWA Hiroyukidc8ecb42006-03-27 01:15:34 -0800347config OUT_OF_LINE_PFN_TO_PAGE
348 def_bool y
349 depends on DISCONTIGMEM
350
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351config NR_CPUS
352 int "Maximum number of CPUs (2-256)"
Andi Kleen01d4bed2006-03-25 16:30:58 +0100353 range 2 255
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 depends on SMP
355 default "8"
356 help
357 This allows you to specify the maximum number of CPUs which this
358 kernel will support. Current maximum is 256 CPUs due to
359 APIC addressing limits. Less depending on the hardware.
360
361 This is purely to save memory - each supported CPU requires
362 memory in the static kernel configuration.
363
Ashok Raj76e4f662005-06-25 14:55:00 -0700364config HOTPLUG_CPU
365 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
366 depends on SMP && HOTPLUG && EXPERIMENTAL
367 help
368 Say Y here to experiment with turning CPUs off and on. CPUs
369 can be controlled through /sys/devices/system/cpu/cpu#.
370 Say N if you want to disable CPU hotplug.
371
372
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373config HPET_TIMER
374 bool
375 default y
376 help
377 Use the IA-PC HPET (High Precision Event Timer) to manage
378 time in preference to the PIT and RTC, if a HPET is
379 present. The HPET provides a stable time base on SMP
380 systems, unlike the TSC, but it is more expensive to access,
381 as it is off-chip. You can find the HPET spec at
Randy Dunlap89d7cbf2005-09-21 09:55:44 -0700382 <http://www.intel.com/hardwaredesign/hpetspec.htm>.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383
384config HPET_EMULATE_RTC
385 bool "Provide RTC interrupt"
386 depends on HPET_TIMER && RTC=y
387
388config GART_IOMMU
Muli Ben-Yehuda17a941d2006-01-11 22:44:42 +0100389 bool "K8 GART IOMMU support"
Andi Kleena54649b2005-07-28 21:15:32 -0700390 default y
Muli Ben-Yehuda17a941d2006-01-11 22:44:42 +0100391 select SWIOTLB
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 depends on PCI
393 help
Jon Mason5d05f4d2006-03-25 16:31:34 +0100394 Support for hardware IOMMU in AMD's Opteron/Athlon64 Processors
395 and for the bounce buffering software IOMMU.
396 Needed to run systems with more than 3GB of memory properly with
397 32-bit PCI devices that do not support DAC (Double Address Cycle).
398 The IOMMU can be turned off at runtime with the iommu=off parameter.
399 Normally the kernel will take the right choice by itself.
400 This option includes a driver for the AMD Opteron/Athlon64 IOMMU
401 northbridge and a software emulation used on other systems without
402 hardware IOMMU. If unsure, say Y.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403
404# need this always enabled with GART_IOMMU for the VIA workaround
405config SWIOTLB
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 bool
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 default y
Muli Ben-Yehuda17a941d2006-01-11 22:44:42 +0100408 depends on GART_IOMMU
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409
410config X86_MCE
411 bool "Machine check support" if EMBEDDED
412 default y
413 help
414 Include a machine check error handler to report hardware errors.
415 This version will require the mcelog utility to decode some
416 machine check error logs. See
417 ftp://ftp.x86-64.org/pub/linux/tools/mcelog
418
419config X86_MCE_INTEL
420 bool "Intel MCE features"
421 depends on X86_MCE && X86_LOCAL_APIC
422 default y
423 help
424 Additional support for intel specific MCE features such as
425 the thermal monitor.
426
Jacob Shin89b831e2005-11-05 17:25:53 +0100427config X86_MCE_AMD
428 bool "AMD MCE features"
429 depends on X86_MCE && X86_LOCAL_APIC
430 default y
431 help
432 Additional support for AMD specific MCE features such as
433 the DRAM Error Threshold.
434
Eric W. Biederman5234f5e2005-06-25 14:58:02 -0700435config KEXEC
436 bool "kexec system call (EXPERIMENTAL)"
437 depends on EXPERIMENTAL
438 help
439 kexec is a system call that implements the ability to shutdown your
440 current kernel, and to start another kernel. It is like a reboot
441 but it is indepedent of the system firmware. And like a reboot
442 you can start any kernel with it, not just Linux.
443
444 The name comes from the similiarity to the exec system call.
445
446 It is an ongoing process to be certain the hardware in a machine
447 is properly shutdown, so do not be surprised if this code does not
448 initially work for you. It may help to enable device hotplugging
449 support. As of this writing the exact hardware interface is
450 strongly in flux, so no good recommendation can be made.
451
Vivek Goyalec9ce0d2006-01-09 20:51:49 -0800452config CRASH_DUMP
453 bool "kernel crash dumps (EXPERIMENTAL)"
Vivek Goyalec9ce0d2006-01-09 20:51:49 -0800454 depends on EXPERIMENTAL
455 help
456 Generate crash dump after being started by kexec.
457
Maneesh Soni05970d42006-01-09 20:51:52 -0800458config PHYSICAL_START
459 hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
460 default "0x1000000" if CRASH_DUMP
Andi Kleen04103602006-03-25 16:30:13 +0100461 default "0x200000"
Maneesh Soni05970d42006-01-09 20:51:52 -0800462 help
463 This gives the physical address where the kernel is loaded. Normally
Andi Kleen04103602006-03-25 16:30:13 +0100464 for regular kernels this value is 0x200000 (2MB). But in the case
Maneesh Soni05970d42006-01-09 20:51:52 -0800465 of kexec on panic the fail safe kernel needs to run at a different
466 address than the panic-ed kernel. This option is used to set the load
467 address for kernels used to capture crash dump on being kexec'ed
468 after panic. The default value for crash dump kernels is
469 0x1000000 (16MB). This can also be set based on the "X" value as
470 specified in the "crashkernel=YM@XM" command line boot parameter
471 passed to the panic-ed kernel. Typically this parameter is set as
472 crashkernel=64M@16M. Please take a look at
473 Documentation/kdump/kdump.txt for more details about crash dumps.
474
475 Don't change this unless you know what you are doing.
476
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477config SECCOMP
478 bool "Enable seccomp to safely compute untrusted bytecode"
479 depends on PROC_FS
480 default y
481 help
482 This kernel feature is useful for number crunching applications
483 that may need to compute untrusted bytecode during their
484 execution. By using pipes or other transports made available to
485 the process as file descriptors supporting the read/write
486 syscalls, it's possible to isolate those applications in
487 their own address space using seccomp. Once seccomp is
488 enabled via /proc/<pid>/seccomp, it cannot be disabled
489 and the task is only allowed to execute a few safe syscalls
490 defined by each seccomp mode.
491
492 If unsure, say Y. Only embedded should say N here.
493
Christoph Lameter59121002005-06-23 00:08:25 -0700494source kernel/Kconfig.hz
495
Arjan van de Ven4bdc3b72006-03-25 16:30:49 +0100496config REORDER
497 bool "Function reordering"
498 default n
499 help
500 This option enables the toolchain to reorder functions for a more
501 optimal TLB usage. If you have pretty much any version of binutils,
502 this can increase your kernel build time by roughly one minute.
503
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504endmenu
505
506#
507# Use the generic interrupt handling code in kernel/irq/:
508#
509config GENERIC_HARDIRQS
510 bool
511 default y
512
513config GENERIC_IRQ_PROBE
514 bool
515 default y
516
Al Viro5cae8412005-05-04 05:39:22 +0100517# we have no ISA slots, but we do have ISA-style DMA.
518config ISA_DMA_API
519 bool
520 default y
521
Ashok Raj54d5d422005-09-06 15:16:15 -0700522config GENERIC_PENDING_IRQ
523 bool
524 depends on GENERIC_HARDIRQS && SMP
525 default y
526
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527menu "Power management options"
528
529source kernel/power/Kconfig
530
531source "drivers/acpi/Kconfig"
532
533source "arch/x86_64/kernel/cpufreq/Kconfig"
534
535endmenu
536
537menu "Bus options (PCI etc.)"
538
539config PCI
540 bool "PCI support"
541
542# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
543config PCI_DIRECT
544 bool
545 depends on PCI
546 default y
547
548config PCI_MMCONFIG
549 bool "Support mmconfig PCI config space access"
Alexander Nyberg8aadff72005-05-27 12:48:50 +0200550 depends on PCI && ACPI
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552source "drivers/pci/pcie/Kconfig"
553
554source "drivers/pci/Kconfig"
555
556source "drivers/pcmcia/Kconfig"
557
558source "drivers/pci/hotplug/Kconfig"
559
560endmenu
561
562
563menu "Executable file formats / Emulations"
564
565source "fs/Kconfig.binfmt"
566
567config IA32_EMULATION
568 bool "IA32 Emulation"
569 help
570 Include code to run 32-bit programs under a 64-bit kernel. You should likely
571 turn this on, unless you're 100% sure that you don't have any 32-bit programs
572 left.
573
574config IA32_AOUT
Andi Kleenea0be472005-11-05 17:25:54 +0100575 tristate "IA32 a.out support"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 depends on IA32_EMULATION
577 help
578 Support old a.out binaries in the 32bit emulation.
579
580config COMPAT
581 bool
582 depends on IA32_EMULATION
583 default y
584
585config SYSVIPC_COMPAT
586 bool
587 depends on COMPAT && SYSVIPC
588 default y
589
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590endmenu
591
Sam Ravnborgd5950b42005-07-11 21:03:49 -0700592source "net/Kconfig"
593
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594source drivers/Kconfig
595
596source "drivers/firmware/Kconfig"
597
598source fs/Kconfig
599
Prasanna S Panchamukhicd6b0762005-11-07 00:59:14 -0800600menu "Instrumentation Support"
601 depends on EXPERIMENTAL
602
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603source "arch/x86_64/oprofile/Kconfig"
604
Prasanna S Panchamukhicd6b0762005-11-07 00:59:14 -0800605config KPROBES
606 bool "Kprobes (EXPERIMENTAL)"
Linus Torvaldsadd2b6f2006-02-26 20:24:40 -0800607 depends on EXPERIMENTAL && MODULES
Prasanna S Panchamukhicd6b0762005-11-07 00:59:14 -0800608 help
609 Kprobes allows you to trap at almost any kernel address and
610 execute a callback function. register_kprobe() establishes
611 a probepoint and specifies the callback. Kprobes is useful
612 for kernel debugging, non-intrusive instrumentation and testing.
613 If in doubt, say "N".
614endmenu
615
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616source "arch/x86_64/Kconfig.debug"
617
618source "security/Kconfig"
619
620source "crypto/Kconfig"
621
622source "lib/Kconfig"