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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
Linus Torvalds1da177e2005-04-16 15:20:36 -070072source "init/Kconfig"
73
74
75menu "Processor type and features"
76
77choice
78 prompt "Processor family"
79 default MK8
80
81config MK8
82 bool "AMD-Opteron/Athlon64"
83 help
84 Optimize for AMD Opteron/Athlon64/Hammer/K8 CPUs.
85
86config MPSC
87 bool "Intel EM64T"
88 help
89 Optimize for Intel Pentium 4 and Xeon CPUs with Intel
90 Extended Memory 64 Technology(EM64T). For details see
91 <http://www.intel.com/technology/64bitextensions/>.
92
93config GENERIC_CPU
94 bool "Generic-x86-64"
95 help
96 Generic x86-64 CPU.
97
98endchoice
99
100#
101# Define implied options from the CPU selection here
102#
103config X86_L1_CACHE_BYTES
104 int
105 default "128" if GENERIC_CPU || MPSC
106 default "64" if MK8
107
108config X86_L1_CACHE_SHIFT
109 int
110 default "7" if GENERIC_CPU || MPSC
111 default "6" if MK8
112
113config X86_TSC
114 bool
115 default y
116
117config X86_GOOD_APIC
118 bool
119 default y
120
121config MICROCODE
122 tristate "/dev/cpu/microcode - Intel CPU microcode support"
123 ---help---
124 If you say Y here the 'File systems' section, you will be
125 able to update the microcode on Intel processors. You will
126 obviously need the actual microcode binary data itself which is
127 not shipped with the Linux kernel.
128
129 For latest news and information on obtaining all the required
130 ingredients for this driver, check:
131 <http://www.urbanmyth.org/microcode/>.
132
133 To compile this driver as a module, choose M here: the
134 module will be called microcode.
135 If you use modprobe or kmod you may also want to add the line
136 'alias char-major-10-184 microcode' to your /etc/modules.conf file.
137
138config X86_MSR
139 tristate "/dev/cpu/*/msr - Model-specific register support"
140 help
141 This device gives privileged processes access to the x86
142 Model-Specific Registers (MSRs). It is a character device with
143 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
144 MSR accesses are directed to a specific CPU on multi-processor
145 systems.
146
147config X86_CPUID
148 tristate "/dev/cpu/*/cpuid - CPU information support"
149 help
150 This device gives processes access to the x86 CPUID instruction to
151 be executed on a specific processor. It is a character device
152 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
153 /dev/cpu/31/cpuid.
154
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155config X86_HT
156 bool
157 depends on SMP && !MK8
158 default y
159
160config MATH_EMULATION
161 bool
162
163config MCA
164 bool
165
166config EISA
167 bool
168
169config X86_IO_APIC
170 bool
171 default y
172
173config X86_LOCAL_APIC
174 bool
175 default y
176
177config MTRR
178 bool "MTRR (Memory Type Range Register) support"
179 ---help---
180 On Intel P6 family processors (Pentium Pro, Pentium II and later)
181 the Memory Type Range Registers (MTRRs) may be used to control
182 processor access to memory ranges. This is most useful if you have
183 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
184 allows bus write transfers to be combined into a larger transfer
185 before bursting over the PCI/AGP bus. This can increase performance
186 of image write operations 2.5 times or more. Saying Y here creates a
187 /proc/mtrr file which may be used to manipulate your processor's
188 MTRRs. Typically the X server should use this.
189
190 This code has a reasonably generic interface so that similar
191 control registers on other processors can be easily supported
192 as well.
193
194 Saying Y here also fixes a problem with buggy SMP BIOSes which only
195 set the MTRRs for the boot CPU and not for the secondary CPUs. This
196 can lead to all sorts of problems, so it's good to say Y here.
197
198 Just say Y here, all x86-64 machines support MTRRs.
199
200 See <file:Documentation/mtrr.txt> for more information.
201
202config SMP
203 bool "Symmetric multi-processing support"
204 ---help---
205 This enables support for systems with more than one CPU. If you have
206 a system with only one CPU, like most personal computers, say N. If
207 you have a system with more than one CPU, say Y.
208
209 If you say N here, the kernel will run on single and multiprocessor
210 machines, but will use only one CPU of a multiprocessor machine. If
211 you say Y here, the kernel will run on many, but not all,
212 singleprocessor machines. On a singleprocessor machine, the kernel
213 will run faster if you say N here.
214
215 If you don't know what to do here, say N.
216
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217config SCHED_SMT
218 bool "SMT (Hyperthreading) scheduler support"
219 depends on SMP
220 default n
221 help
222 SMT scheduler support improves the CPU scheduler's decision making
223 when dealing with Intel Pentium 4 chips with HyperThreading at a
224 cost of slightly increased overhead in some places. If unsure say
225 N here.
226
Ingo Molnarcc19ca82005-06-25 14:57:36 -0700227source "kernel/Kconfig.preempt"
228
Ravikiran G Thirumalaib0bd35e2005-11-05 17:25:54 +0100229config NUMA
230 bool "Non Uniform Memory Access (NUMA) Support"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 depends on SMP
232 help
Ravikiran G Thirumalaib0bd35e2005-11-05 17:25:54 +0100233 Enable NUMA (Non Uniform Memory Access) support. The kernel
234 will try to allocate memory used by a CPU on the local memory
235 controller of the CPU and add some more NUMA awareness to the kernel.
236 This code is recommended on all multiprocessor Opteron systems.
237 If the system is EM64T, you should say N unless your system is EM64T
238 NUMA.
239
240config K8_NUMA
241 bool "Old style AMD Opteron NUMA detection"
242 depends on NUMA
243 default y
244 help
245 Enable K8 NUMA node topology detection. You should say Y here if
246 you have a multi processor AMD K8 system. This uses an old
247 method to read the NUMA configurtion directly from the builtin
248 Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
249 instead, which also takes priority if both are compiled in.
250
251# Dummy CONFIG option to select ACPI_NUMA from drivers/acpi/Kconfig.
252
253config X86_64_ACPI_NUMA
254 bool "ACPI NUMA detection"
255 depends on NUMA
256 select ACPI
257 select ACPI_NUMA
258 default y
259 help
260 Enable ACPI SRAT based node topology detection.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261
262config NUMA_EMU
Ravikiran G Thirumalaib0bd35e2005-11-05 17:25:54 +0100263 bool "NUMA emulation"
264 depends on NUMA
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 help
266 Enable NUMA emulation. A flat machine will be split
267 into virtual nodes when booted with "numa=fake=N", where N is the
268 number of nodes. This is only useful for debugging.
269
Dave Hansen3f22ab22005-06-23 00:07:43 -0700270config ARCH_DISCONTIGMEM_ENABLE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 bool
272 depends on NUMA
273 default y
274
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275
Matt Tolentino1035faf2005-06-23 00:08:05 -0700276config ARCH_DISCONTIGMEM_ENABLE
277 def_bool y
278 depends on NUMA
279
280config ARCH_DISCONTIGMEM_DEFAULT
281 def_bool y
282 depends on NUMA
283
284config ARCH_SPARSEMEM_ENABLE
285 def_bool y
286 depends on NUMA
287
288config ARCH_FLATMEM_ENABLE
289 def_bool y
290 depends on !NUMA
291
Dave Hansen3f22ab22005-06-23 00:07:43 -0700292source "mm/Kconfig"
293
Matt Tolentino1035faf2005-06-23 00:08:05 -0700294config HAVE_ARCH_EARLY_PFN_TO_NID
295 def_bool y
296
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297config NR_CPUS
298 int "Maximum number of CPUs (2-256)"
299 range 2 256
300 depends on SMP
301 default "8"
302 help
303 This allows you to specify the maximum number of CPUs which this
304 kernel will support. Current maximum is 256 CPUs due to
305 APIC addressing limits. Less depending on the hardware.
306
307 This is purely to save memory - each supported CPU requires
308 memory in the static kernel configuration.
309
Ashok Raj76e4f662005-06-25 14:55:00 -0700310config HOTPLUG_CPU
311 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
312 depends on SMP && HOTPLUG && EXPERIMENTAL
313 help
314 Say Y here to experiment with turning CPUs off and on. CPUs
315 can be controlled through /sys/devices/system/cpu/cpu#.
316 Say N if you want to disable CPU hotplug.
317
318
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319config HPET_TIMER
320 bool
321 default y
322 help
323 Use the IA-PC HPET (High Precision Event Timer) to manage
324 time in preference to the PIT and RTC, if a HPET is
325 present. The HPET provides a stable time base on SMP
326 systems, unlike the TSC, but it is more expensive to access,
327 as it is off-chip. You can find the HPET spec at
Randy Dunlap89d7cbf2005-09-21 09:55:44 -0700328 <http://www.intel.com/hardwaredesign/hpetspec.htm>.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329
Andi Kleen312df5f2005-05-16 21:53:28 -0700330config X86_PM_TIMER
331 bool "PM timer"
Andi Kleen9c2be6a2005-05-31 14:39:26 -0700332 depends on ACPI
Andi Kleen312df5f2005-05-16 21:53:28 -0700333 default y
334 help
335 Support the ACPI PM timer for time keeping. This is slow,
336 but is useful on some chipsets without HPET on systems with more
337 than one CPU. On a single processor or single socket multi core
338 system it is normally not required.
339 When the PM timer is active 64bit vsyscalls are disabled
340 and should not be enabled (/proc/sys/kernel/vsyscall64 should
341 not be changed).
342 The kernel selects the PM timer only as a last resort, so it is
343 useful to enable just in case.
344
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345config HPET_EMULATE_RTC
346 bool "Provide RTC interrupt"
347 depends on HPET_TIMER && RTC=y
348
349config GART_IOMMU
350 bool "IOMMU support"
Andi Kleena54649b2005-07-28 21:15:32 -0700351 default y
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 depends on PCI
353 help
Andi Kleena54649b2005-07-28 21:15:32 -0700354 Support the IOMMU. Needed to run systems with more than 3GB of memory
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 properly with 32-bit PCI devices that do not support DAC (Double Address
356 Cycle). The IOMMU can be turned off at runtime with the iommu=off parameter.
357 Normally the kernel will take the right choice by itself.
Andi Kleena54649b2005-07-28 21:15:32 -0700358 This option includes a driver for the AMD Opteron/Athlon64 IOMMU
359 and a software emulation used on some other systems.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 If unsure, say Y.
361
362# need this always enabled with GART_IOMMU for the VIA workaround
363config SWIOTLB
364 bool
365 depends on GART_IOMMU
366 default y
367
368config DUMMY_IOMMU
369 bool
370 depends on !GART_IOMMU && !SWIOTLB
371 default y
372 help
373 Don't use IOMMU code. This will cause problems when you have more than 4GB
374 of memory and any 32-bit devices. Don't turn on unless you know what you
375 are doing.
376
377config X86_MCE
378 bool "Machine check support" if EMBEDDED
379 default y
380 help
381 Include a machine check error handler to report hardware errors.
382 This version will require the mcelog utility to decode some
383 machine check error logs. See
384 ftp://ftp.x86-64.org/pub/linux/tools/mcelog
385
386config X86_MCE_INTEL
387 bool "Intel MCE features"
388 depends on X86_MCE && X86_LOCAL_APIC
389 default y
390 help
391 Additional support for intel specific MCE features such as
392 the thermal monitor.
393
Jacob Shin89b831e2005-11-05 17:25:53 +0100394config X86_MCE_AMD
395 bool "AMD MCE features"
396 depends on X86_MCE && X86_LOCAL_APIC
397 default y
398 help
399 Additional support for AMD specific MCE features such as
400 the DRAM Error Threshold.
401
Eric W. Biedermand0537502005-06-25 14:57:52 -0700402config PHYSICAL_START
403 hex "Physical address where the kernel is loaded" if EMBEDDED
404 default "0x100000"
405 help
406 This gives the physical address where the kernel is loaded.
407 Primarily used in the case of kexec on panic where the
408 fail safe kernel needs to run at a different address than
409 the panic-ed kernel.
410
411 Don't change this unless you know what you are doing.
412
Eric W. Biederman5234f5e2005-06-25 14:58:02 -0700413config KEXEC
414 bool "kexec system call (EXPERIMENTAL)"
415 depends on EXPERIMENTAL
416 help
417 kexec is a system call that implements the ability to shutdown your
418 current kernel, and to start another kernel. It is like a reboot
419 but it is indepedent of the system firmware. And like a reboot
420 you can start any kernel with it, not just Linux.
421
422 The name comes from the similiarity to the exec system call.
423
424 It is an ongoing process to be certain the hardware in a machine
425 is properly shutdown, so do not be surprised if this code does not
426 initially work for you. It may help to enable device hotplugging
427 support. As of this writing the exact hardware interface is
428 strongly in flux, so no good recommendation can be made.
429
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430config SECCOMP
431 bool "Enable seccomp to safely compute untrusted bytecode"
432 depends on PROC_FS
433 default y
434 help
435 This kernel feature is useful for number crunching applications
436 that may need to compute untrusted bytecode during their
437 execution. By using pipes or other transports made available to
438 the process as file descriptors supporting the read/write
439 syscalls, it's possible to isolate those applications in
440 their own address space using seccomp. Once seccomp is
441 enabled via /proc/<pid>/seccomp, it cannot be disabled
442 and the task is only allowed to execute a few safe syscalls
443 defined by each seccomp mode.
444
445 If unsure, say Y. Only embedded should say N here.
446
Christoph Lameter59121002005-06-23 00:08:25 -0700447source kernel/Kconfig.hz
448
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449endmenu
450
451#
452# Use the generic interrupt handling code in kernel/irq/:
453#
454config GENERIC_HARDIRQS
455 bool
456 default y
457
458config GENERIC_IRQ_PROBE
459 bool
460 default y
461
Al Viro5cae8412005-05-04 05:39:22 +0100462# we have no ISA slots, but we do have ISA-style DMA.
463config ISA_DMA_API
464 bool
465 default y
466
Ashok Raj54d5d422005-09-06 15:16:15 -0700467config GENERIC_PENDING_IRQ
468 bool
469 depends on GENERIC_HARDIRQS && SMP
470 default y
471
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472menu "Power management options"
473
474source kernel/power/Kconfig
475
476source "drivers/acpi/Kconfig"
477
478source "arch/x86_64/kernel/cpufreq/Kconfig"
479
480endmenu
481
482menu "Bus options (PCI etc.)"
483
484config PCI
485 bool "PCI support"
486
487# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
488config PCI_DIRECT
489 bool
490 depends on PCI
491 default y
492
493config PCI_MMCONFIG
494 bool "Support mmconfig PCI config space access"
Alexander Nyberg8aadff72005-05-27 12:48:50 +0200495 depends on PCI && ACPI
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496
497config UNORDERED_IO
498 bool "Unordered IO mapping access"
499 depends on EXPERIMENTAL
500 help
501 Use unordered stores to access IO memory mappings in device drivers.
502 Still very experimental. When a driver works on IA64/ppc64/pa-risc it should
503 work with this option, but it makes the drivers behave differently
504 from i386. Requires that the driver writer used memory barriers
505 properly.
506
507source "drivers/pci/pcie/Kconfig"
508
509source "drivers/pci/Kconfig"
510
511source "drivers/pcmcia/Kconfig"
512
513source "drivers/pci/hotplug/Kconfig"
514
515endmenu
516
517
518menu "Executable file formats / Emulations"
519
520source "fs/Kconfig.binfmt"
521
522config IA32_EMULATION
523 bool "IA32 Emulation"
524 help
525 Include code to run 32-bit programs under a 64-bit kernel. You should likely
526 turn this on, unless you're 100% sure that you don't have any 32-bit programs
527 left.
528
529config IA32_AOUT
Andi Kleenea0be472005-11-05 17:25:54 +0100530 tristate "IA32 a.out support"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 depends on IA32_EMULATION
532 help
533 Support old a.out binaries in the 32bit emulation.
534
535config COMPAT
536 bool
537 depends on IA32_EMULATION
538 default y
539
540config SYSVIPC_COMPAT
541 bool
542 depends on COMPAT && SYSVIPC
543 default y
544
545config UID16
546 bool
547 depends on IA32_EMULATION
548 default y
549
550endmenu
551
Sam Ravnborgd5950b42005-07-11 21:03:49 -0700552source "net/Kconfig"
553
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554source drivers/Kconfig
555
556source "drivers/firmware/Kconfig"
557
558source fs/Kconfig
559
Prasanna S Panchamukhicd6b0762005-11-07 00:59:14 -0800560menu "Instrumentation Support"
561 depends on EXPERIMENTAL
562
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563source "arch/x86_64/oprofile/Kconfig"
564
Prasanna S Panchamukhicd6b0762005-11-07 00:59:14 -0800565config KPROBES
566 bool "Kprobes (EXPERIMENTAL)"
567 help
568 Kprobes allows you to trap at almost any kernel address and
569 execute a callback function. register_kprobe() establishes
570 a probepoint and specifies the callback. Kprobes is useful
571 for kernel debugging, non-intrusive instrumentation and testing.
572 If in doubt, say "N".
573endmenu
574
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575source "arch/x86_64/Kconfig.debug"
576
577source "security/Kconfig"
578
579source "crypto/Kconfig"
580
581source "lib/Kconfig"