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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
48config GENERIC_CALIBRATE_DELAY
49 bool
50 default y
51
52config X86_CMPXCHG
53 bool
54 default y
55
56config EARLY_PRINTK
57 bool
58 default y
59
60config GENERIC_ISA_DMA
61 bool
62 default y
63
64config GENERIC_IOMAP
65 bool
66 default y
67
viro@ZenIV.linux.org.uka08b6b72005-09-06 01:48:42 +010068config ARCH_MAY_HAVE_PC_FDC
69 bool
70 default y
71
Andi Kleene9928672006-01-11 22:43:33 +010072config DMI
73 bool
74 default y
75
Linus Torvalds1da177e2005-04-16 15:20:36 -070076source "init/Kconfig"
77
78
79menu "Processor type and features"
80
81choice
82 prompt "Processor family"
83 default MK8
84
85config MK8
86 bool "AMD-Opteron/Athlon64"
87 help
88 Optimize for AMD Opteron/Athlon64/Hammer/K8 CPUs.
89
90config MPSC
91 bool "Intel EM64T"
92 help
93 Optimize for Intel Pentium 4 and Xeon CPUs with Intel
94 Extended Memory 64 Technology(EM64T). For details see
95 <http://www.intel.com/technology/64bitextensions/>.
96
97config GENERIC_CPU
98 bool "Generic-x86-64"
99 help
100 Generic x86-64 CPU.
101
102endchoice
103
104#
105# Define implied options from the CPU selection here
106#
107config X86_L1_CACHE_BYTES
108 int
109 default "128" if GENERIC_CPU || MPSC
110 default "64" if MK8
111
112config X86_L1_CACHE_SHIFT
113 int
114 default "7" if GENERIC_CPU || MPSC
115 default "6" if MK8
116
117config X86_TSC
118 bool
119 default y
120
121config X86_GOOD_APIC
122 bool
123 default y
124
125config MICROCODE
126 tristate "/dev/cpu/microcode - Intel CPU microcode support"
127 ---help---
128 If you say Y here the 'File systems' section, you will be
129 able to update the microcode on Intel processors. You will
130 obviously need the actual microcode binary data itself which is
131 not shipped with the Linux kernel.
132
133 For latest news and information on obtaining all the required
134 ingredients for this driver, check:
135 <http://www.urbanmyth.org/microcode/>.
136
137 To compile this driver as a module, choose M here: the
138 module will be called microcode.
139 If you use modprobe or kmod you may also want to add the line
140 'alias char-major-10-184 microcode' to your /etc/modules.conf file.
141
142config X86_MSR
143 tristate "/dev/cpu/*/msr - Model-specific register support"
144 help
145 This device gives privileged processes access to the x86
146 Model-Specific Registers (MSRs). It is a character device with
147 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
148 MSR accesses are directed to a specific CPU on multi-processor
149 systems.
150
151config X86_CPUID
152 tristate "/dev/cpu/*/cpuid - CPU information support"
153 help
154 This device gives processes access to the x86 CPUID instruction to
155 be executed on a specific processor. It is a character device
156 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
157 /dev/cpu/31/cpuid.
158
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159config X86_HT
160 bool
161 depends on SMP && !MK8
162 default y
163
164config MATH_EMULATION
165 bool
166
167config MCA
168 bool
169
170config EISA
171 bool
172
173config X86_IO_APIC
174 bool
175 default y
176
177config X86_LOCAL_APIC
178 bool
179 default y
180
181config MTRR
182 bool "MTRR (Memory Type Range Register) support"
183 ---help---
184 On Intel P6 family processors (Pentium Pro, Pentium II and later)
185 the Memory Type Range Registers (MTRRs) may be used to control
186 processor access to memory ranges. This is most useful if you have
187 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
188 allows bus write transfers to be combined into a larger transfer
189 before bursting over the PCI/AGP bus. This can increase performance
190 of image write operations 2.5 times or more. Saying Y here creates a
191 /proc/mtrr file which may be used to manipulate your processor's
192 MTRRs. Typically the X server should use this.
193
194 This code has a reasonably generic interface so that similar
195 control registers on other processors can be easily supported
196 as well.
197
198 Saying Y here also fixes a problem with buggy SMP BIOSes which only
199 set the MTRRs for the boot CPU and not for the secondary CPUs. This
200 can lead to all sorts of problems, so it's good to say Y here.
201
202 Just say Y here, all x86-64 machines support MTRRs.
203
204 See <file:Documentation/mtrr.txt> for more information.
205
206config SMP
207 bool "Symmetric multi-processing support"
208 ---help---
209 This enables support for systems with more than one CPU. If you have
210 a system with only one CPU, like most personal computers, say N. If
211 you have a system with more than one CPU, say Y.
212
213 If you say N here, the kernel will run on single and multiprocessor
214 machines, but will use only one CPU of a multiprocessor machine. If
215 you say Y here, the kernel will run on many, but not all,
216 singleprocessor machines. On a singleprocessor machine, the kernel
217 will run faster if you say N here.
218
219 If you don't know what to do here, say N.
220
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221config SCHED_SMT
222 bool "SMT (Hyperthreading) scheduler support"
223 depends on SMP
224 default n
225 help
226 SMT scheduler support improves the CPU scheduler's decision making
227 when dealing with Intel Pentium 4 chips with HyperThreading at a
228 cost of slightly increased overhead in some places. If unsure say
229 N here.
230
Ingo Molnarcc19ca82005-06-25 14:57:36 -0700231source "kernel/Kconfig.preempt"
232
Ravikiran G Thirumalaib0bd35e2005-11-05 17:25:54 +0100233config NUMA
234 bool "Non Uniform Memory Access (NUMA) Support"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 depends on SMP
236 help
Ravikiran G Thirumalaib0bd35e2005-11-05 17:25:54 +0100237 Enable NUMA (Non Uniform Memory Access) support. The kernel
238 will try to allocate memory used by a CPU on the local memory
239 controller of the CPU and add some more NUMA awareness to the kernel.
240 This code is recommended on all multiprocessor Opteron systems.
241 If the system is EM64T, you should say N unless your system is EM64T
242 NUMA.
243
244config K8_NUMA
245 bool "Old style AMD Opteron NUMA detection"
246 depends on NUMA
247 default y
248 help
249 Enable K8 NUMA node topology detection. You should say Y here if
250 you have a multi processor AMD K8 system. This uses an old
251 method to read the NUMA configurtion directly from the builtin
252 Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
253 instead, which also takes priority if both are compiled in.
254
255# Dummy CONFIG option to select ACPI_NUMA from drivers/acpi/Kconfig.
256
257config X86_64_ACPI_NUMA
258 bool "ACPI NUMA detection"
259 depends on NUMA
260 select ACPI
261 select ACPI_NUMA
262 default y
263 help
264 Enable ACPI SRAT based node topology detection.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265
266config NUMA_EMU
Ravikiran G Thirumalaib0bd35e2005-11-05 17:25:54 +0100267 bool "NUMA emulation"
268 depends on NUMA
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 help
270 Enable NUMA emulation. A flat machine will be split
271 into virtual nodes when booted with "numa=fake=N", where N is the
272 number of nodes. This is only useful for debugging.
273
Dave Hansen3f22ab22005-06-23 00:07:43 -0700274config ARCH_DISCONTIGMEM_ENABLE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 bool
276 depends on NUMA
277 default y
278
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279
Matt Tolentino1035faf2005-06-23 00:08:05 -0700280config ARCH_DISCONTIGMEM_ENABLE
281 def_bool y
282 depends on NUMA
283
284config ARCH_DISCONTIGMEM_DEFAULT
285 def_bool y
286 depends on NUMA
287
288config ARCH_SPARSEMEM_ENABLE
289 def_bool y
290 depends on NUMA
291
292config ARCH_FLATMEM_ENABLE
293 def_bool y
294 depends on !NUMA
295
Dave Hansen3f22ab22005-06-23 00:07:43 -0700296source "mm/Kconfig"
297
Matt Tolentino1035faf2005-06-23 00:08:05 -0700298config HAVE_ARCH_EARLY_PFN_TO_NID
299 def_bool y
300
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301config NR_CPUS
302 int "Maximum number of CPUs (2-256)"
303 range 2 256
304 depends on SMP
305 default "8"
306 help
307 This allows you to specify the maximum number of CPUs which this
308 kernel will support. Current maximum is 256 CPUs due to
309 APIC addressing limits. Less depending on the hardware.
310
311 This is purely to save memory - each supported CPU requires
312 memory in the static kernel configuration.
313
Ashok Raj76e4f662005-06-25 14:55:00 -0700314config HOTPLUG_CPU
315 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
316 depends on SMP && HOTPLUG && EXPERIMENTAL
317 help
318 Say Y here to experiment with turning CPUs off and on. CPUs
319 can be controlled through /sys/devices/system/cpu/cpu#.
320 Say N if you want to disable CPU hotplug.
321
322
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323config HPET_TIMER
324 bool
325 default y
326 help
327 Use the IA-PC HPET (High Precision Event Timer) to manage
328 time in preference to the PIT and RTC, if a HPET is
329 present. The HPET provides a stable time base on SMP
330 systems, unlike the TSC, but it is more expensive to access,
331 as it is off-chip. You can find the HPET spec at
Randy Dunlap89d7cbf2005-09-21 09:55:44 -0700332 <http://www.intel.com/hardwaredesign/hpetspec.htm>.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333
Andi Kleen312df5f2005-05-16 21:53:28 -0700334config X86_PM_TIMER
335 bool "PM timer"
Andi Kleen9c2be6a2005-05-31 14:39:26 -0700336 depends on ACPI
Andi Kleen312df5f2005-05-16 21:53:28 -0700337 default y
338 help
339 Support the ACPI PM timer for time keeping. This is slow,
340 but is useful on some chipsets without HPET on systems with more
341 than one CPU. On a single processor or single socket multi core
342 system it is normally not required.
343 When the PM timer is active 64bit vsyscalls are disabled
344 and should not be enabled (/proc/sys/kernel/vsyscall64 should
345 not be changed).
346 The kernel selects the PM timer only as a last resort, so it is
347 useful to enable just in case.
348
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349config HPET_EMULATE_RTC
350 bool "Provide RTC interrupt"
351 depends on HPET_TIMER && RTC=y
352
353config GART_IOMMU
354 bool "IOMMU support"
Andi Kleena54649b2005-07-28 21:15:32 -0700355 default y
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 depends on PCI
357 help
Andi Kleena54649b2005-07-28 21:15:32 -0700358 Support the IOMMU. Needed to run systems with more than 3GB of memory
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 properly with 32-bit PCI devices that do not support DAC (Double Address
360 Cycle). The IOMMU can be turned off at runtime with the iommu=off parameter.
361 Normally the kernel will take the right choice by itself.
Andi Kleena54649b2005-07-28 21:15:32 -0700362 This option includes a driver for the AMD Opteron/Athlon64 IOMMU
363 and a software emulation used on some other systems.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 If unsure, say Y.
365
366# need this always enabled with GART_IOMMU for the VIA workaround
367config SWIOTLB
368 bool
369 depends on GART_IOMMU
370 default y
371
372config DUMMY_IOMMU
373 bool
374 depends on !GART_IOMMU && !SWIOTLB
375 default y
376 help
377 Don't use IOMMU code. This will cause problems when you have more than 4GB
378 of memory and any 32-bit devices. Don't turn on unless you know what you
379 are doing.
380
381config X86_MCE
382 bool "Machine check support" if EMBEDDED
383 default y
384 help
385 Include a machine check error handler to report hardware errors.
386 This version will require the mcelog utility to decode some
387 machine check error logs. See
388 ftp://ftp.x86-64.org/pub/linux/tools/mcelog
389
390config X86_MCE_INTEL
391 bool "Intel MCE features"
392 depends on X86_MCE && X86_LOCAL_APIC
393 default y
394 help
395 Additional support for intel specific MCE features such as
396 the thermal monitor.
397
Jacob Shin89b831e2005-11-05 17:25:53 +0100398config X86_MCE_AMD
399 bool "AMD MCE features"
400 depends on X86_MCE && X86_LOCAL_APIC
401 default y
402 help
403 Additional support for AMD specific MCE features such as
404 the DRAM Error Threshold.
405
Eric W. Biederman5234f5e2005-06-25 14:58:02 -0700406config KEXEC
407 bool "kexec system call (EXPERIMENTAL)"
408 depends on EXPERIMENTAL
409 help
410 kexec is a system call that implements the ability to shutdown your
411 current kernel, and to start another kernel. It is like a reboot
412 but it is indepedent of the system firmware. And like a reboot
413 you can start any kernel with it, not just Linux.
414
415 The name comes from the similiarity to the exec system call.
416
417 It is an ongoing process to be certain the hardware in a machine
418 is properly shutdown, so do not be surprised if this code does not
419 initially work for you. It may help to enable device hotplugging
420 support. As of this writing the exact hardware interface is
421 strongly in flux, so no good recommendation can be made.
422
Vivek Goyalec9ce0d2006-01-09 20:51:49 -0800423config CRASH_DUMP
424 bool "kernel crash dumps (EXPERIMENTAL)"
Vivek Goyalec9ce0d2006-01-09 20:51:49 -0800425 depends on EXPERIMENTAL
426 help
427 Generate crash dump after being started by kexec.
428
Maneesh Soni05970d42006-01-09 20:51:52 -0800429config PHYSICAL_START
430 hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
431 default "0x1000000" if CRASH_DUMP
432 default "0x100000"
433 help
434 This gives the physical address where the kernel is loaded. Normally
435 for regular kernels this value is 0x100000 (1MB). But in the case
436 of kexec on panic the fail safe kernel needs to run at a different
437 address than the panic-ed kernel. This option is used to set the load
438 address for kernels used to capture crash dump on being kexec'ed
439 after panic. The default value for crash dump kernels is
440 0x1000000 (16MB). This can also be set based on the "X" value as
441 specified in the "crashkernel=YM@XM" command line boot parameter
442 passed to the panic-ed kernel. Typically this parameter is set as
443 crashkernel=64M@16M. Please take a look at
444 Documentation/kdump/kdump.txt for more details about crash dumps.
445
446 Don't change this unless you know what you are doing.
447
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448config SECCOMP
449 bool "Enable seccomp to safely compute untrusted bytecode"
450 depends on PROC_FS
451 default y
452 help
453 This kernel feature is useful for number crunching applications
454 that may need to compute untrusted bytecode during their
455 execution. By using pipes or other transports made available to
456 the process as file descriptors supporting the read/write
457 syscalls, it's possible to isolate those applications in
458 their own address space using seccomp. Once seccomp is
459 enabled via /proc/<pid>/seccomp, it cannot be disabled
460 and the task is only allowed to execute a few safe syscalls
461 defined by each seccomp mode.
462
463 If unsure, say Y. Only embedded should say N here.
464
Christoph Lameter59121002005-06-23 00:08:25 -0700465source kernel/Kconfig.hz
466
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467endmenu
468
469#
470# Use the generic interrupt handling code in kernel/irq/:
471#
472config GENERIC_HARDIRQS
473 bool
474 default y
475
476config GENERIC_IRQ_PROBE
477 bool
478 default y
479
Al Viro5cae8412005-05-04 05:39:22 +0100480# we have no ISA slots, but we do have ISA-style DMA.
481config ISA_DMA_API
482 bool
483 default y
484
Ashok Raj54d5d422005-09-06 15:16:15 -0700485config GENERIC_PENDING_IRQ
486 bool
487 depends on GENERIC_HARDIRQS && SMP
488 default y
489
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490menu "Power management options"
491
492source kernel/power/Kconfig
493
494source "drivers/acpi/Kconfig"
495
496source "arch/x86_64/kernel/cpufreq/Kconfig"
497
498endmenu
499
500menu "Bus options (PCI etc.)"
501
502config PCI
503 bool "PCI support"
504
505# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
506config PCI_DIRECT
507 bool
508 depends on PCI
509 default y
510
511config PCI_MMCONFIG
512 bool "Support mmconfig PCI config space access"
Alexander Nyberg8aadff72005-05-27 12:48:50 +0200513 depends on PCI && ACPI
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514
515config UNORDERED_IO
516 bool "Unordered IO mapping access"
517 depends on EXPERIMENTAL
518 help
519 Use unordered stores to access IO memory mappings in device drivers.
520 Still very experimental. When a driver works on IA64/ppc64/pa-risc it should
521 work with this option, but it makes the drivers behave differently
522 from i386. Requires that the driver writer used memory barriers
523 properly.
524
525source "drivers/pci/pcie/Kconfig"
526
527source "drivers/pci/Kconfig"
528
529source "drivers/pcmcia/Kconfig"
530
531source "drivers/pci/hotplug/Kconfig"
532
533endmenu
534
535
536menu "Executable file formats / Emulations"
537
538source "fs/Kconfig.binfmt"
539
540config IA32_EMULATION
541 bool "IA32 Emulation"
542 help
543 Include code to run 32-bit programs under a 64-bit kernel. You should likely
544 turn this on, unless you're 100% sure that you don't have any 32-bit programs
545 left.
546
547config IA32_AOUT
Andi Kleenea0be472005-11-05 17:25:54 +0100548 tristate "IA32 a.out support"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 depends on IA32_EMULATION
550 help
551 Support old a.out binaries in the 32bit emulation.
552
553config COMPAT
554 bool
555 depends on IA32_EMULATION
556 default y
557
558config SYSVIPC_COMPAT
559 bool
560 depends on COMPAT && SYSVIPC
561 default y
562
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563endmenu
564
Sam Ravnborgd5950b42005-07-11 21:03:49 -0700565source "net/Kconfig"
566
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567source drivers/Kconfig
568
569source "drivers/firmware/Kconfig"
570
571source fs/Kconfig
572
Prasanna S Panchamukhicd6b0762005-11-07 00:59:14 -0800573menu "Instrumentation Support"
574 depends on EXPERIMENTAL
575
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576source "arch/x86_64/oprofile/Kconfig"
577
Prasanna S Panchamukhicd6b0762005-11-07 00:59:14 -0800578config KPROBES
579 bool "Kprobes (EXPERIMENTAL)"
580 help
581 Kprobes allows you to trap at almost any kernel address and
582 execute a callback function. register_kprobe() establishes
583 a probepoint and specifies the callback. Kprobes is useful
584 for kernel debugging, non-intrusive instrumentation and testing.
585 If in doubt, say "N".
586endmenu
587
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588source "arch/x86_64/Kconfig.debug"
589
590source "security/Kconfig"
591
592source "crypto/Kconfig"
593
594source "lib/Kconfig"