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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
Ravikiran G Thirumalai79f12612006-01-11 22:46:18 +010082 prompt "Subarchitecture Type"
83 default X86_PC
84
85config X86_PC
86 bool "PC-compatible"
87 help
88 Choose this option if your computer is a standard PC or compatible.
89
90config X86_VSMP
91 bool "Support for ScaleMP vSMP"
92 help
93 Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is
94 supposed to run on these EM64T-based machines. Only choose this option
95 if you have one of these machines.
96
97endchoice
98
99choice
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 prompt "Processor family"
101 default MK8
102
103config MK8
104 bool "AMD-Opteron/Athlon64"
105 help
106 Optimize for AMD Opteron/Athlon64/Hammer/K8 CPUs.
107
108config MPSC
109 bool "Intel EM64T"
110 help
111 Optimize for Intel Pentium 4 and Xeon CPUs with Intel
112 Extended Memory 64 Technology(EM64T). For details see
113 <http://www.intel.com/technology/64bitextensions/>.
114
115config GENERIC_CPU
116 bool "Generic-x86-64"
117 help
118 Generic x86-64 CPU.
119
120endchoice
121
122#
123# Define implied options from the CPU selection here
124#
125config X86_L1_CACHE_BYTES
126 int
127 default "128" if GENERIC_CPU || MPSC
128 default "64" if MK8
129
130config X86_L1_CACHE_SHIFT
131 int
132 default "7" if GENERIC_CPU || MPSC
133 default "6" if MK8
134
135config X86_TSC
136 bool
137 default y
138
139config X86_GOOD_APIC
140 bool
141 default y
142
143config MICROCODE
144 tristate "/dev/cpu/microcode - Intel CPU microcode support"
145 ---help---
146 If you say Y here the 'File systems' section, you will be
147 able to update the microcode on Intel processors. You will
148 obviously need the actual microcode binary data itself which is
149 not shipped with the Linux kernel.
150
151 For latest news and information on obtaining all the required
152 ingredients for this driver, check:
153 <http://www.urbanmyth.org/microcode/>.
154
155 To compile this driver as a module, choose M here: the
156 module will be called microcode.
157 If you use modprobe or kmod you may also want to add the line
158 'alias char-major-10-184 microcode' to your /etc/modules.conf file.
159
160config X86_MSR
161 tristate "/dev/cpu/*/msr - Model-specific register support"
162 help
163 This device gives privileged processes access to the x86
164 Model-Specific Registers (MSRs). It is a character device with
165 major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
166 MSR accesses are directed to a specific CPU on multi-processor
167 systems.
168
169config X86_CPUID
170 tristate "/dev/cpu/*/cpuid - CPU information support"
171 help
172 This device gives processes access to the x86 CPUID instruction to
173 be executed on a specific processor. It is a character device
174 with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
175 /dev/cpu/31/cpuid.
176
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177config X86_HT
178 bool
179 depends on SMP && !MK8
180 default y
181
182config MATH_EMULATION
183 bool
184
185config MCA
186 bool
187
188config EISA
189 bool
190
191config X86_IO_APIC
192 bool
193 default y
194
195config X86_LOCAL_APIC
196 bool
197 default y
198
199config MTRR
200 bool "MTRR (Memory Type Range Register) support"
201 ---help---
202 On Intel P6 family processors (Pentium Pro, Pentium II and later)
203 the Memory Type Range Registers (MTRRs) may be used to control
204 processor access to memory ranges. This is most useful if you have
205 a video (VGA) card on a PCI or AGP bus. Enabling write-combining
206 allows bus write transfers to be combined into a larger transfer
207 before bursting over the PCI/AGP bus. This can increase performance
208 of image write operations 2.5 times or more. Saying Y here creates a
209 /proc/mtrr file which may be used to manipulate your processor's
210 MTRRs. Typically the X server should use this.
211
212 This code has a reasonably generic interface so that similar
213 control registers on other processors can be easily supported
214 as well.
215
216 Saying Y here also fixes a problem with buggy SMP BIOSes which only
217 set the MTRRs for the boot CPU and not for the secondary CPUs. This
218 can lead to all sorts of problems, so it's good to say Y here.
219
220 Just say Y here, all x86-64 machines support MTRRs.
221
222 See <file:Documentation/mtrr.txt> for more information.
223
224config SMP
225 bool "Symmetric multi-processing support"
226 ---help---
227 This enables support for systems with more than one CPU. If you have
228 a system with only one CPU, like most personal computers, say N. If
229 you have a system with more than one CPU, say Y.
230
231 If you say N here, the kernel will run on single and multiprocessor
232 machines, but will use only one CPU of a multiprocessor machine. If
233 you say Y here, the kernel will run on many, but not all,
234 singleprocessor machines. On a singleprocessor machine, the kernel
235 will run faster if you say N here.
236
237 If you don't know what to do here, say N.
238
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239config SCHED_SMT
240 bool "SMT (Hyperthreading) scheduler support"
241 depends on SMP
242 default n
243 help
244 SMT scheduler support improves the CPU scheduler's decision making
245 when dealing with Intel Pentium 4 chips with HyperThreading at a
246 cost of slightly increased overhead in some places. If unsure say
247 N here.
248
Ingo Molnarcc19ca82005-06-25 14:57:36 -0700249source "kernel/Kconfig.preempt"
250
Ravikiran G Thirumalaib0bd35e2005-11-05 17:25:54 +0100251config NUMA
252 bool "Non Uniform Memory Access (NUMA) Support"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 depends on SMP
254 help
Ravikiran G Thirumalaib0bd35e2005-11-05 17:25:54 +0100255 Enable NUMA (Non Uniform Memory Access) support. The kernel
256 will try to allocate memory used by a CPU on the local memory
257 controller of the CPU and add some more NUMA awareness to the kernel.
258 This code is recommended on all multiprocessor Opteron systems.
259 If the system is EM64T, you should say N unless your system is EM64T
260 NUMA.
261
262config K8_NUMA
263 bool "Old style AMD Opteron NUMA detection"
264 depends on NUMA
265 default y
266 help
267 Enable K8 NUMA node topology detection. You should say Y here if
268 you have a multi processor AMD K8 system. This uses an old
269 method to read the NUMA configurtion directly from the builtin
270 Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA
271 instead, which also takes priority if both are compiled in.
272
273# Dummy CONFIG option to select ACPI_NUMA from drivers/acpi/Kconfig.
274
275config X86_64_ACPI_NUMA
276 bool "ACPI NUMA detection"
277 depends on NUMA
278 select ACPI
279 select ACPI_NUMA
280 default y
281 help
282 Enable ACPI SRAT based node topology detection.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283
284config NUMA_EMU
Ravikiran G Thirumalaib0bd35e2005-11-05 17:25:54 +0100285 bool "NUMA emulation"
286 depends on NUMA
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 help
288 Enable NUMA emulation. A flat machine will be split
289 into virtual nodes when booted with "numa=fake=N", where N is the
290 number of nodes. This is only useful for debugging.
291
Dave Hansen3f22ab22005-06-23 00:07:43 -0700292config ARCH_DISCONTIGMEM_ENABLE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 bool
294 depends on NUMA
295 default y
296
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297
Matt Tolentino1035faf2005-06-23 00:08:05 -0700298config ARCH_DISCONTIGMEM_ENABLE
299 def_bool y
300 depends on NUMA
301
302config ARCH_DISCONTIGMEM_DEFAULT
303 def_bool y
304 depends on NUMA
305
306config ARCH_SPARSEMEM_ENABLE
307 def_bool y
Matt Tolentino44df75e2006-01-17 07:03:41 +0100308 depends on (NUMA || EXPERIMENTAL)
309
310config ARCH_MEMORY_PROBE
311 def_bool y
312 depends on MEMORY_HOTPLUG
Matt Tolentino1035faf2005-06-23 00:08:05 -0700313
314config ARCH_FLATMEM_ENABLE
315 def_bool y
316 depends on !NUMA
317
Dave Hansen3f22ab22005-06-23 00:07:43 -0700318source "mm/Kconfig"
319
Matt Tolentino1035faf2005-06-23 00:08:05 -0700320config HAVE_ARCH_EARLY_PFN_TO_NID
321 def_bool y
Matt Tolentino44df75e2006-01-17 07:03:41 +0100322 depends on NUMA
Matt Tolentino1035faf2005-06-23 00:08:05 -0700323
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324config NR_CPUS
325 int "Maximum number of CPUs (2-256)"
Andi Kleen01d4bed2006-03-25 16:30:58 +0100326 range 2 255
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 depends on SMP
328 default "8"
329 help
330 This allows you to specify the maximum number of CPUs which this
331 kernel will support. Current maximum is 256 CPUs due to
332 APIC addressing limits. Less depending on the hardware.
333
334 This is purely to save memory - each supported CPU requires
335 memory in the static kernel configuration.
336
Ashok Raj76e4f662005-06-25 14:55:00 -0700337config HOTPLUG_CPU
338 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
339 depends on SMP && HOTPLUG && EXPERIMENTAL
340 help
341 Say Y here to experiment with turning CPUs off and on. CPUs
342 can be controlled through /sys/devices/system/cpu/cpu#.
343 Say N if you want to disable CPU hotplug.
344
345
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346config HPET_TIMER
347 bool
348 default y
349 help
350 Use the IA-PC HPET (High Precision Event Timer) to manage
351 time in preference to the PIT and RTC, if a HPET is
352 present. The HPET provides a stable time base on SMP
353 systems, unlike the TSC, but it is more expensive to access,
354 as it is off-chip. You can find the HPET spec at
Randy Dunlap89d7cbf2005-09-21 09:55:44 -0700355 <http://www.intel.com/hardwaredesign/hpetspec.htm>.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356
357config HPET_EMULATE_RTC
358 bool "Provide RTC interrupt"
359 depends on HPET_TIMER && RTC=y
360
361config GART_IOMMU
Muli Ben-Yehuda17a941d2006-01-11 22:44:42 +0100362 bool "K8 GART IOMMU support"
Andi Kleena54649b2005-07-28 21:15:32 -0700363 default y
Muli Ben-Yehuda17a941d2006-01-11 22:44:42 +0100364 select SWIOTLB
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 depends on PCI
366 help
Andi Kleena54649b2005-07-28 21:15:32 -0700367 Support the IOMMU. Needed to run systems with more than 3GB of memory
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 properly with 32-bit PCI devices that do not support DAC (Double Address
369 Cycle). The IOMMU can be turned off at runtime with the iommu=off parameter.
370 Normally the kernel will take the right choice by itself.
Muli Ben-Yehuda17a941d2006-01-11 22:44:42 +0100371 This option includes a driver for the AMD Opteron/Athlon64 northbridge IOMMU
372 and a software emulation used on other systems.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 If unsure, say Y.
374
375# need this always enabled with GART_IOMMU for the VIA workaround
376config SWIOTLB
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 bool
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 default y
Muli Ben-Yehuda17a941d2006-01-11 22:44:42 +0100379 depends on GART_IOMMU
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380
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
Andi Kleen04103602006-03-25 16:30:13 +0100432 default "0x200000"
Maneesh Soni05970d42006-01-09 20:51:52 -0800433 help
434 This gives the physical address where the kernel is loaded. Normally
Andi Kleen04103602006-03-25 16:30:13 +0100435 for regular kernels this value is 0x200000 (2MB). But in the case
Maneesh Soni05970d42006-01-09 20:51:52 -0800436 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
Arjan van de Ven4bdc3b72006-03-25 16:30:49 +0100467config REORDER
468 bool "Function reordering"
469 default n
470 help
471 This option enables the toolchain to reorder functions for a more
472 optimal TLB usage. If you have pretty much any version of binutils,
473 this can increase your kernel build time by roughly one minute.
474
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475endmenu
476
477#
478# Use the generic interrupt handling code in kernel/irq/:
479#
480config GENERIC_HARDIRQS
481 bool
482 default y
483
484config GENERIC_IRQ_PROBE
485 bool
486 default y
487
Al Viro5cae8412005-05-04 05:39:22 +0100488# we have no ISA slots, but we do have ISA-style DMA.
489config ISA_DMA_API
490 bool
491 default y
492
Ashok Raj54d5d422005-09-06 15:16:15 -0700493config GENERIC_PENDING_IRQ
494 bool
495 depends on GENERIC_HARDIRQS && SMP
496 default y
497
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498menu "Power management options"
499
500source kernel/power/Kconfig
501
502source "drivers/acpi/Kconfig"
503
504source "arch/x86_64/kernel/cpufreq/Kconfig"
505
506endmenu
507
508menu "Bus options (PCI etc.)"
509
510config PCI
511 bool "PCI support"
512
513# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
514config PCI_DIRECT
515 bool
516 depends on PCI
517 default y
518
519config PCI_MMCONFIG
520 bool "Support mmconfig PCI config space access"
Alexander Nyberg8aadff72005-05-27 12:48:50 +0200521 depends on PCI && ACPI
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522
523config UNORDERED_IO
524 bool "Unordered IO mapping access"
525 depends on EXPERIMENTAL
526 help
527 Use unordered stores to access IO memory mappings in device drivers.
528 Still very experimental. When a driver works on IA64/ppc64/pa-risc it should
529 work with this option, but it makes the drivers behave differently
530 from i386. Requires that the driver writer used memory barriers
531 properly.
532
533source "drivers/pci/pcie/Kconfig"
534
535source "drivers/pci/Kconfig"
536
537source "drivers/pcmcia/Kconfig"
538
539source "drivers/pci/hotplug/Kconfig"
540
541endmenu
542
543
544menu "Executable file formats / Emulations"
545
546source "fs/Kconfig.binfmt"
547
548config IA32_EMULATION
549 bool "IA32 Emulation"
550 help
551 Include code to run 32-bit programs under a 64-bit kernel. You should likely
552 turn this on, unless you're 100% sure that you don't have any 32-bit programs
553 left.
554
555config IA32_AOUT
Andi Kleenea0be472005-11-05 17:25:54 +0100556 tristate "IA32 a.out support"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 depends on IA32_EMULATION
558 help
559 Support old a.out binaries in the 32bit emulation.
560
561config COMPAT
562 bool
563 depends on IA32_EMULATION
564 default y
565
566config SYSVIPC_COMPAT
567 bool
568 depends on COMPAT && SYSVIPC
569 default y
570
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571endmenu
572
Sam Ravnborgd5950b42005-07-11 21:03:49 -0700573source "net/Kconfig"
574
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575source drivers/Kconfig
576
577source "drivers/firmware/Kconfig"
578
579source fs/Kconfig
580
Prasanna S Panchamukhicd6b0762005-11-07 00:59:14 -0800581menu "Instrumentation Support"
582 depends on EXPERIMENTAL
583
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584source "arch/x86_64/oprofile/Kconfig"
585
Prasanna S Panchamukhicd6b0762005-11-07 00:59:14 -0800586config KPROBES
587 bool "Kprobes (EXPERIMENTAL)"
Linus Torvaldsadd2b6f2006-02-26 20:24:40 -0800588 depends on EXPERIMENTAL && MODULES
Prasanna S Panchamukhicd6b0762005-11-07 00:59:14 -0800589 help
590 Kprobes allows you to trap at almost any kernel address and
591 execute a callback function. register_kprobe() establishes
592 a probepoint and specifies the callback. Kprobes is useful
593 for kernel debugging, non-intrusive instrumentation and testing.
594 If in doubt, say "N".
595endmenu
596
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597source "arch/x86_64/Kconfig.debug"
598
599source "security/Kconfig"
600
601source "crypto/Kconfig"
602
603source "lib/Kconfig"