Kconfig 69.0 KB
Newer Older
S
Sam Ravnborg 已提交
1 2
# Select 32 or 64 bit
config 64BIT
3 4
	bool "64-bit kernel" if ARCH = "x86"
	default ARCH = "x86_64"
I
Ingo Molnar 已提交
5
	---help---
S
Sam Ravnborg 已提交
6 7 8 9 10
	  Say yes to build a 64-bit kernel - formerly known as x86_64
	  Say no to build a 32-bit kernel - formerly known as i386

config X86_32
	def_bool !64BIT
11
	select CLKSRC_I8253
S
Sam Ravnborg 已提交
12 13 14

config X86_64
	def_bool 64BIT
15 16

### Arch settings
17
config X86
18
	def_bool y
19
	select HAVE_AOUT if X86_32
20
	select HAVE_UNSTABLE_SCHED_CLOCK
S
Sam Ravnborg 已提交
21
	select HAVE_IDE
M
Mathieu Desnoyers 已提交
22
	select HAVE_OPROFILE
23
	select HAVE_PCSPKR_PLATFORM
P
Peter Zijlstra 已提交
24
	select HAVE_PERF_EVENTS
25
	select HAVE_IRQ_WORK
26
	select HAVE_IOREMAP_PROT
M
Mathieu Desnoyers 已提交
27
	select HAVE_KPROBES
28
	select HAVE_MEMBLOCK
T
Tejun Heo 已提交
29
	select HAVE_MEMBLOCK_NODE_MAP
30
	select ARCH_DISCARD_MEMBLOCK
I
Ingo Molnar 已提交
31
	select ARCH_WANT_OPTIONAL_GPIOLIB
32
	select ARCH_WANT_FRAME_POINTERS
33
	select HAVE_DMA_ATTRS
34
	select HAVE_KRETPROBES
35
	select HAVE_OPTPROBES
36
	select HAVE_FTRACE_MCOUNT_RECORD
37
	select HAVE_C_RECORDMCOUNT
38
	select HAVE_DYNAMIC_FTRACE
39
	select HAVE_FUNCTION_TRACER
40
	select HAVE_FUNCTION_GRAPH_TRACER
41
	select HAVE_FUNCTION_GRAPH_FP_TEST
42
	select HAVE_FUNCTION_TRACE_MCOUNT_TEST
43
	select HAVE_FTRACE_NMI_ENTER if DYNAMIC_FTRACE
44
	select HAVE_SYSCALL_TRACEPOINTS
45
	select HAVE_KVM
46
	select HAVE_ARCH_KGDB
47
	select HAVE_ARCH_TRACEHOOK
48
	select HAVE_GENERIC_DMA_COHERENT if X86_32
49
	select HAVE_EFFICIENT_UNALIGNED_ACCESS
50
	select USER_STACKTRACE_SUPPORT
51
	select HAVE_REGS_AND_STACK_ACCESS_API
52
	select HAVE_DMA_API_DEBUG
53 54 55
	select HAVE_KERNEL_GZIP
	select HAVE_KERNEL_BZIP2
	select HAVE_KERNEL_LZMA
L
Lasse Collin 已提交
56
	select HAVE_KERNEL_XZ
57
	select HAVE_KERNEL_LZO
58
	select HAVE_HW_BREAKPOINT
59
	select HAVE_MIXED_BREAKPOINTS_REGS
60
	select PERF_EVENTS
61
	select HAVE_PERF_EVENTS_NMI
62
	select ANON_INODES
63
	select HAVE_ARCH_KMEMCHECK
A
Avi Kivity 已提交
64
	select HAVE_USER_RETURN_NOTIFIER
65
	select HAVE_ARCH_JUMP_LABEL
66
	select HAVE_TEXT_POKE_SMP
T
Thomas Gleixner 已提交
67 68
	select HAVE_GENERIC_HARDIRQS
	select HAVE_SPARSE_IRQ
69
	select SPARSE_IRQ
70
	select GENERIC_FIND_FIRST_BIT
T
Thomas Gleixner 已提交
71 72
	select GENERIC_IRQ_PROBE
	select GENERIC_PENDING_IRQ if SMP
73
	select GENERIC_IRQ_SHOW
74
	select GENERIC_CLOCKEVENTS_MIN_ADJUST
75
	select IRQ_FORCED_THREADING
76
	select USE_GENERIC_SMP_HELPERS if SMP
77
	select HAVE_BPF_JIT if (X86_64 && NET)
78
	select CLKEVT_I8253
79
	select ARCH_HAVE_NMI_SAFE_CMPXCHG
80

81 82 83
config INSTRUCTION_DECODER
	def_bool (KPROBES || PERF_EVENTS)

84 85 86 87 88
config OUTPUT_FORMAT
	string
	default "elf32-i386" if X86_32
	default "elf64-x86-64" if X86_64

89
config ARCH_DEFCONFIG
90
	string
91 92
	default "arch/x86/configs/i386_defconfig" if X86_32
	default "arch/x86/configs/x86_64_defconfig" if X86_64
93

94
config GENERIC_CMOS_UPDATE
95
	def_bool y
96 97

config CLOCKSOURCE_WATCHDOG
98
	def_bool y
99 100

config GENERIC_CLOCKEVENTS
101
	def_bool y
102

103 104 105 106
config ARCH_CLOCKSOURCE_DATA
	def_bool y
	depends on X86_64

107
config GENERIC_CLOCKEVENTS_BROADCAST
108
	def_bool y
109 110 111
	depends on X86_64 || (X86_32 && X86_LOCAL_APIC)

config LOCKDEP_SUPPORT
112
	def_bool y
113 114

config STACKTRACE_SUPPORT
115
	def_bool y
116

117 118 119
config HAVE_LATENCYTOP_SUPPORT
	def_bool y

120
config MMU
121
	def_bool y
122 123

config ZONE_DMA
124 125 126 127 128 129 130 131
	bool "DMA memory allocation support" if EXPERT
	default y
	help
	  DMA memory allocation support allows devices with less than 32-bit
	  addressing to allocate within the first 16MB of address space.
	  Disable if no such devices will be used.

	  If unsure, say Y.
132 133 134 135

config SBUS
	bool

136
config NEED_DMA_MAP_STATE
137
       def_bool (X86_64 || INTEL_IOMMU || DMA_API_DEBUG)
138

139
config NEED_SG_DMA_LENGTH
140
	def_bool y
141

142
config GENERIC_ISA_DMA
143
	def_bool ISA_DMA_API
144 145

config GENERIC_IOMAP
146
	def_bool y
147 148

config GENERIC_BUG
149
	def_bool y
150
	depends on BUG
151 152 153 154
	select GENERIC_BUG_RELATIVE_POINTERS if X86_64

config GENERIC_BUG_RELATIVE_POINTERS
	bool
155 156

config GENERIC_HWEIGHT
157
	def_bool y
158

159
config GENERIC_GPIO
160
	bool
161

162
config ARCH_MAY_HAVE_PC_FDC
163
	def_bool ISA_DMA_API
164

165 166 167 168 169 170
config RWSEM_GENERIC_SPINLOCK
	def_bool !X86_XADD

config RWSEM_XCHGADD_ALGORITHM
	def_bool X86_XADD

V
Venki Pallipadi 已提交
171 172 173
config ARCH_HAS_CPU_IDLE_WAIT
	def_bool y

174 175 176
config GENERIC_CALIBRATE_DELAY
	def_bool y

177 178 179 180
config GENERIC_TIME_VSYSCALL
	bool
	default X86_64

181 182 183
config ARCH_HAS_CPU_RELAX
	def_bool y

184 185 186
config ARCH_HAS_DEFAULT_IDLE
	def_bool y

187 188 189
config ARCH_HAS_CACHE_LINE_SIZE
	def_bool y

190
config HAVE_SETUP_PER_CPU_AREA
191
	def_bool y
192

193 194 195 196
config NEED_PER_CPU_EMBED_FIRST_CHUNK
	def_bool y

config NEED_PER_CPU_PAGE_FIRST_CHUNK
197 198
	def_bool y

199 200 201
config ARCH_HIBERNATION_POSSIBLE
	def_bool y

J
Johannes Berg 已提交
202 203 204
config ARCH_SUSPEND_POSSIBLE
	def_bool y

205 206 207 208 209 210 211 212
config ZONE_DMA32
	bool
	default X86_64

config AUDIT_ARCH
	bool
	default X86_64

213 214 215
config ARCH_SUPPORTS_OPTIMIZED_INLINING
	def_bool y

A
Akinobu Mita 已提交
216 217 218
config ARCH_SUPPORTS_DEBUG_PAGEALLOC
	def_bool y

219 220
config HAVE_INTEL_TXT
	def_bool y
221
	depends on EXPERIMENTAL && INTEL_IOMMU && ACPI
222

223 224 225 226 227 228 229 230
config X86_32_SMP
	def_bool y
	depends on X86_32 && SMP

config X86_64_SMP
	def_bool y
	depends on X86_64 && SMP

231
config X86_HT
J
Jan Beulich 已提交
232
	def_bool y
233
	depends on SMP
234

235 236
config X86_32_LAZY_GS
	def_bool y
237
	depends on X86_32 && !CC_STACKPROTECTOR
238

239 240 241 242 243
config ARCH_HWEIGHT_CFLAGS
	string
	default "-fcall-saved-ecx -fcall-saved-edx" if X86_32
	default "-fcall-saved-rdi -fcall-saved-rsi -fcall-saved-rdx -fcall-saved-rcx -fcall-saved-r8 -fcall-saved-r9 -fcall-saved-r10 -fcall-saved-r11" if X86_64

244 245
config KTIME_SCALAR
	def_bool X86_32
246 247 248 249 250

config ARCH_CPU_PROBE_RELEASE
	def_bool y
	depends on HOTPLUG_CPU

251
source "init/Kconfig"
252
source "kernel/Kconfig.freezer"
253

254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279
menu "Processor type and features"

source "kernel/time/Kconfig"

config SMP
	bool "Symmetric multi-processing support"
	---help---
	  This enables support for systems with more than one CPU. If you have
	  a system with only one CPU, like most personal computers, say N. If
	  you have a system with more than one CPU, say Y.

	  If you say N here, the kernel will run on single and multiprocessor
	  machines, but will use only one CPU of a multiprocessor machine. If
	  you say Y here, the kernel will run on many, but not all,
	  singleprocessor machines. On a singleprocessor machine, the kernel
	  will run faster if you say N here.

	  Note that if you say Y here and choose architecture "586" or
	  "Pentium" under "Processor family", the kernel will not work on 486
	  architectures. Similarly, multiprocessor kernels for the "PPro"
	  architecture may not work on all Pentium based boards.

	  People using multiprocessor machines who say Y here should also say
	  Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
	  Management" code will be disabled if you say Y here.

P
Paul Bolle 已提交
280
	  See also <file:Documentation/x86/i386/IO-APIC.txt>,
281 282 283 284 285
	  <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
	  <http://www.tldp.org/docs.html#howto>.

	  If you don't know what to do here, say N.

Y
Yinghai Lu 已提交
286 287
config X86_X2APIC
	bool "Support x2apic"
288
	depends on X86_LOCAL_APIC && X86_64 && IRQ_REMAP
Y
Yinghai Lu 已提交
289 290 291 292 293 294 295 296
	---help---
	  This enables x2apic support on CPUs that have this feature.

	  This allows 32-bit apic IDs (so it can support very large systems),
	  and accesses the local apic via MSRs not via mmio.

	  If you don't know what to do here, say N.

297
config X86_MPPARSE
298 299
	bool "Enable MPS table" if ACPI
	default y
300
	depends on X86_LOCAL_APIC
I
Ingo Molnar 已提交
301
	---help---
302 303 304
	  For old smp systems that do not have proper acpi support. Newer systems
	  (esp with 64bit cpus) with acpi support, MADT and DSDT will override it

305 306 307
config X86_BIGSMP
	bool "Support for big SMP systems with more than 8 CPUs"
	depends on X86_32 && SMP
I
Ingo Molnar 已提交
308
	---help---
309
	  This option is needed for the systems that have more than 8 CPUs
310

311
if X86_32
312 313 314
config X86_EXTENDED_PLATFORM
	bool "Support for extended (non-PC) x86 platforms"
	default y
I
Ingo Molnar 已提交
315
	---help---
316 317 318 319
	  If you disable this option then the kernel will only support
	  standard PC platforms. (which covers the vast majority of
	  systems out there.)

320 321 322 323 324 325 326 327
	  If you enable this option then you'll be able to select support
	  for the following (non-PC) 32 bit x86 platforms:
		AMD Elan
		NUMAQ (IBM/Sequent)
		RDC R-321x SoC
		SGI 320/540 (Visual Workstation)
		Summit/EXA (IBM x440)
		Unisys ES7000 IA32 series
328
		Moorestown MID devices
329 330 331

	  If you have one of these systems, or if you want to build a
	  generic distribution kernel, say Y here - otherwise say N.
332
endif
333

334 335 336 337 338 339 340 341 342 343 344
if X86_64
config X86_EXTENDED_PLATFORM
	bool "Support for extended (non-PC) x86 platforms"
	default y
	---help---
	  If you disable this option then the kernel will only support
	  standard PC platforms. (which covers the vast majority of
	  systems out there.)

	  If you enable this option then you'll be able to select support
	  for the following (non-PC) 64 bit x86 platforms:
S
Steffen Persvold 已提交
345
		Numascale NumaChip
346 347 348 349 350 351
		ScaleMP vSMP
		SGI Ultraviolet

	  If you have one of these systems, or if you want to build a
	  generic distribution kernel, say Y here - otherwise say N.
endif
352 353
# This is an alphabetically sorted list of 64 bit extended platforms
# Please maintain the alphabetic order if and when there are additions
S
Steffen Persvold 已提交
354 355 356 357 358 359 360 361 362 363 364 365
config X86_NUMACHIP
	bool "Numascale NumaChip"
	depends on X86_64
	depends on X86_EXTENDED_PLATFORM
	depends on NUMA
	depends on SMP
	depends on X86_X2APIC
	depends on !EDAC_AMD64
	---help---
	  Adds support for Numascale NumaChip large-SMP systems. Needed to
	  enable more than ~168 cores.
	  If you don't have one of these, you should say N here.
366

367 368
config X86_VSMP
	bool "ScaleMP vSMP"
369
	select PARAVIRT_GUEST
370 371 372
	select PARAVIRT
	depends on X86_64 && PCI
	depends on X86_EXTENDED_PLATFORM
I
Ingo Molnar 已提交
373
	---help---
374 375 376
	  Support for ScaleMP vSMP systems.  Say 'Y' here if this kernel is
	  supposed to run on these EM64T-based machines.  Only choose this option
	  if you have one of these machines.
377

N
Nick Piggin 已提交
378 379 380
config X86_UV
	bool "SGI Ultraviolet"
	depends on X86_64
381
	depends on X86_EXTENDED_PLATFORM
382
	depends on NUMA
383
	depends on X86_X2APIC
I
Ingo Molnar 已提交
384
	---help---
N
Nick Piggin 已提交
385 386 387
	  This option is needed in order to support SGI Ultraviolet systems.
	  If you don't have one of these, you should say N here.

388 389
# Following is an alphabetically sorted list of 32 bit extended platforms
# Please maintain the alphabetic order if and when there are additions
390

T
Thomas Gleixner 已提交
391 392 393 394 395 396
config X86_INTEL_CE
	bool "CE4100 TV platform"
	depends on PCI
	depends on PCI_GODIRECT
	depends on X86_32
	depends on X86_EXTENDED_PLATFORM
397
	select X86_REBOOTFIXUPS
398 399
	select OF
	select OF_EARLY_FLATTREE
T
Thomas Gleixner 已提交
400 401 402 403 404
	---help---
	  Select for the Intel CE media processor (CE4100) SOC.
	  This option compiles in support for the CE4100 SOC for settop
	  boxes and media devices.

405
config X86_WANT_INTEL_MID
406 407 408 409 410 411 412 413
	bool "Intel MID platform support"
	depends on X86_32
	depends on X86_EXTENDED_PLATFORM
	---help---
	  Select to build a kernel capable of supporting Intel MID platform
	  systems which do not have the PCI legacy interfaces (Moorestown,
	  Medfield). If you are building for a PC class system say N here.

414
if X86_WANT_INTEL_MID
415

A
Alan Cox 已提交
416 417 418
config X86_INTEL_MID
	bool

419 420
config X86_MRST
       bool "Moorestown MID platform"
421 422 423
	depends on PCI
	depends on PCI_GOANY
	depends on X86_IO_APIC
424
	select APB_TIMER
425 426
	select I2C
	select SPI
427
	select INTEL_SCU_IPC
428
	select X86_PLATFORM_DEVICES
429
	select X86_INTEL_MID
430 431 432 433 434 435 436 437
	---help---
	  Moorestown is Intel's Low Power Intel Architecture (LPIA) based Moblin
	  Internet Device(MID) platform. Moorestown consists of two chips:
	  Lincroft (CPU core, graphics, and memory controller) and Langwell IOH.
	  Unlike standard x86 PCs, Moorestown does not have many legacy devices
	  nor standard legacy replacement devices/features. e.g. Moorestown does
	  not contain i8259, i8254, HPET, legacy BIOS, most of the io ports.

438 439
endif

440 441
config X86_RDC321X
	bool "RDC R-321x SoC"
442
	depends on X86_32
443 444 445 446 447 448 449 450
	depends on X86_EXTENDED_PLATFORM
	select M486
	select X86_REBOOTFIXUPS
	---help---
	  This option is needed for RDC R-321x system-on-chip, also known
	  as R-8610-(G).
	  If you don't have one of these chips, you should say N here.

451
config X86_32_NON_STANDARD
452 453
	bool "Support non-standard 32-bit SMP architectures"
	depends on X86_32 && SMP
454
	depends on X86_EXTENDED_PLATFORM
I
Ingo Molnar 已提交
455 456
	---help---
	  This option compiles in the NUMAQ, Summit, bigsmp, ES7000, default
457 458 459 460
	  subarchitectures.  It is intended for a generic binary kernel.
	  if you select them all, kernel will probe it one by one. and will
	  fallback to default.

461
# Alphabetically sorted list of Non standard 32 bit platforms
462

463 464
config X86_NUMAQ
	bool "NUMAQ (IBM/Sequent)"
465
	depends on X86_32_NON_STANDARD
466
	depends on PCI
467
	select NUMA
468
	select X86_MPPARSE
I
Ingo Molnar 已提交
469
	---help---
470 471 472 473 474
	  This option is used for getting Linux to run on a NUMAQ (IBM/Sequent)
	  NUMA multiquad box. This changes the way that processors are
	  bootstrapped, and uses Clustered Logical APIC addressing mode instead
	  of Flat Logical.  You will need a new lynxer.elf file to flash your
	  firmware with - send email to <Martin.Bligh@us.ibm.com>.
475

476
config X86_SUPPORTS_MEMORY_FAILURE
J
Jan Beulich 已提交
477
	def_bool y
478 479 480 481 482 483 484 485
	# MCE code calls memory_failure():
	depends on X86_MCE
	# On 32-bit this adds too big of NODES_SHIFT and we run out of page flags:
	depends on !X86_NUMAQ
	# On 32-bit SPARSEMEM adds too big of SECTIONS_WIDTH:
	depends on X86_64 || !SPARSEMEM
	select ARCH_SUPPORTS_MEMORY_FAILURE

486 487
config X86_VISWS
	bool "SGI 320/540 (Visual Workstation)"
488 489 490
	depends on X86_32 && PCI && X86_MPPARSE && PCI_GODIRECT
	depends on X86_32_NON_STANDARD
	---help---
491 492 493 494 495 496 497 498
	  The SGI Visual Workstation series is an IA32-based workstation
	  based on SGI systems chips with some legacy PC hardware attached.

	  Say Y here to create a kernel to run on the SGI 320 or 540.

	  A kernel compiled for the Visual Workstation will run on general
	  PCs as well. See <file:Documentation/sgi-visws.txt> for details.

499 500
config X86_SUMMIT
	bool "Summit/EXA (IBM x440)"
501
	depends on X86_32_NON_STANDARD
I
Ingo Molnar 已提交
502
	---help---
503 504
	  This option is needed for IBM systems that use the Summit/EXA chipset.
	  In particular, it is needed for the x440.
I
Ingo Molnar 已提交
505

506
config X86_ES7000
507
	bool "Unisys ES7000 IA32 series"
508
	depends on X86_32_NON_STANDARD && X86_BIGSMP
I
Ingo Molnar 已提交
509
	---help---
510 511 512
	  Support for Unisys ES7000 systems.  Say 'Y' here if this kernel is
	  supposed to run on an IA32-based Unisys ES7000 system.

513 514 515 516 517 518 519 520 521 522 523 524 525
config X86_32_IRIS
	tristate "Eurobraille/Iris poweroff module"
	depends on X86_32
	---help---
	  The Iris machines from EuroBraille do not have APM or ACPI support
	  to shut themselves down properly.  A special I/O sequence is
	  needed to do so, which is what this module does at
	  kernel shutdown.

	  This is only for Iris machines from EuroBraille.

	  If unused, say N.

526
config SCHED_OMIT_FRAME_POINTER
527 528
	def_bool y
	prompt "Single-depth WCHAN output"
529
	depends on X86
I
Ingo Molnar 已提交
530
	---help---
531 532 533 534 535 536 537 538 539
	  Calculate simpler /proc/<PID>/wchan values. If this option
	  is disabled then wchan values will recurse back to the
	  caller function. This provides more accurate wchan values,
	  at the expense of slightly more scheduling overhead.

	  If in doubt, say "Y".

menuconfig PARAVIRT_GUEST
	bool "Paravirtualized guest support"
I
Ingo Molnar 已提交
540
	---help---
541 542 543 544 545 546 547
	  Say Y here to get to see options related to running Linux under
	  various hypervisors.  This option alone does not add any kernel code.

	  If you say N, all options in this submenu will be skipped and disabled.

if PARAVIRT_GUEST

548 549 550 551 552 553 554 555 556 557 558 559
config PARAVIRT_TIME_ACCOUNTING
	bool "Paravirtual steal time accounting"
	select PARAVIRT
	default n
	---help---
	  Select this option to enable fine granularity task steal time
	  accounting. Time spent executing other tasks in parallel with
	  the current vCPU is discounted from the vCPU power. To account for
	  that, there can be a small performance impact.

	  If in doubt, say N here.

560 561
source "arch/x86/xen/Kconfig"

562 563 564
config KVM_CLOCK
	bool "KVM paravirtualized clock"
	select PARAVIRT
565
	select PARAVIRT_CLOCK
I
Ingo Molnar 已提交
566
	---help---
567 568 569 570 571 572
	  Turning on this option will allow you to run a paravirtualized clock
	  when running over the KVM hypervisor. Instead of relying on a PIT
	  (or probably other) emulation by the underlying device model, the host
	  provides the guest with timing infrastructure such as time of day, and
	  system time

573 574 575
config KVM_GUEST
	bool "KVM Guest support"
	select PARAVIRT
I
Ingo Molnar 已提交
576 577 578
	---help---
	  This option enables various optimizations for running under the KVM
	  hypervisor.
579

580 581
source "arch/x86/lguest/Kconfig"

582 583
config PARAVIRT
	bool "Enable paravirtualization code"
I
Ingo Molnar 已提交
584
	---help---
585 586 587 588 589
	  This changes the kernel so it can modify itself when it is run
	  under a hypervisor, potentially improving performance significantly
	  over full virtualization.  However, when run without a hypervisor
	  the kernel is theoretically slower and slightly larger.

590 591 592 593 594 595 596 597 598 599 600 601 602
config PARAVIRT_SPINLOCKS
	bool "Paravirtualization layer for spinlocks"
	depends on PARAVIRT && SMP && EXPERIMENTAL
	---help---
	  Paravirtualized spinlocks allow a pvops backend to replace the
	  spinlock implementation with something virtualization-friendly
	  (for example, block the virtual CPU rather than spinning).

	  Unfortunately the downside is an up to 5% performance hit on
	  native kernels, with various workloads.

	  If you are unsure how to answer this question, answer N.

603 604 605
config PARAVIRT_CLOCK
	bool

606 607
endif

608
config PARAVIRT_DEBUG
I
Ingo Molnar 已提交
609 610 611 612 613
	bool "paravirt-ops debugging"
	depends on PARAVIRT && DEBUG_KERNEL
	---help---
	  Enable to debug paravirt_ops internals.  Specifically, BUG if
	  a paravirt_op is missing when it is called.
614

615
config NO_BOOTMEM
Y
Yinghai Lu 已提交
616
	def_bool y
617

618 619
config MEMTEST
	bool "Memtest"
I
Ingo Molnar 已提交
620
	---help---
Y
Yinghai Lu 已提交
621
	  This option adds a kernel parameter 'memtest', which allows memtest
622
	  to be set.
I
Ingo Molnar 已提交
623 624 625 626
	        memtest=0, mean disabled; -- default
	        memtest=1, mean do 1 test pattern;
	        ...
	        memtest=4, mean do 4 test patterns.
T
Thomas Gleixner 已提交
627
	  If you are unsure how to answer this question, answer N.
628 629

config X86_SUMMIT_NUMA
630
	def_bool y
631
	depends on X86_32 && NUMA && X86_32_NON_STANDARD
632 633

config X86_CYCLONE_TIMER
634
	def_bool y
635
	depends on X86_32_NON_STANDARD
636 637 638 639

source "arch/x86/Kconfig.cpu"

config HPET_TIMER
640
	def_bool X86_64
641
	prompt "HPET Timer Support" if X86_32
I
Ingo Molnar 已提交
642 643 644 645 646 647 648 649 650
	---help---
	  Use the IA-PC HPET (High Precision Event Timer) to manage
	  time in preference to the PIT and RTC, if a HPET is
	  present.
	  HPET is the next generation timer replacing legacy 8254s.
	  The HPET provides a stable time base on SMP
	  systems, unlike the TSC, but it is more expensive to access,
	  as it is off-chip.  You can find the HPET spec at
	  <http://www.intel.com/hardwaredesign/hpetspec_1.pdf>.
651

I
Ingo Molnar 已提交
652 653 654
	  You can safely choose Y here.  However, HPET will only be
	  activated if the platform and the BIOS support this feature.
	  Otherwise the 8254 will be used for timing services.
655

I
Ingo Molnar 已提交
656
	  Choose N to continue using the legacy 8254 timer.
657 658

config HPET_EMULATE_RTC
659
	def_bool y
660
	depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
661

662 663 664
config APB_TIMER
       def_bool y if MRST
       prompt "Langwell APB Timer Support" if X86_MRST
665
       select DW_APB_TIMER
666 667 668 669 670 671 672
       help
         APB timer is the replacement for 8254, HPET on X86 MID platforms.
         The APBT provides a stable time base on SMP
         systems, unlike the TSC, but it is more expensive to access,
         as it is off-chip. APB timers are always running regardless of CPU
         C states, they are used as per CPU clockevent device when possible.

673
# Mark as expert because too many people got it wrong.
674
# The code disables itself when not needed.
675 676
config DMI
	default y
677
	bool "Enable DMI scanning" if EXPERT
I
Ingo Molnar 已提交
678
	---help---
679 680 681 682 683
	  Enabled scanning of DMI to identify machine quirks. Say Y
	  here unless you have verified that your setup is not
	  affected by entries in the DMI blacklist. Required by PNP
	  BIOS code.

684
config GART_IOMMU
685
	bool "GART IOMMU support" if EXPERT
686 687
	default y
	select SWIOTLB
688
	depends on X86_64 && PCI && AMD_NB
I
Ingo Molnar 已提交
689
	---help---
690 691 692 693 694 695 696 697 698 699 700 701 702 703
	  Support for full DMA access of devices with 32bit memory access only
	  on systems with more than 3GB. This is usually needed for USB,
	  sound, many IDE/SATA chipsets and some other devices.
	  Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART
	  based hardware IOMMU and a software bounce buffer based IOMMU used
	  on Intel systems and as fallback.
	  The code is only active when needed (enough memory and limited
	  device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified
	  too.

config CALGARY_IOMMU
	bool "IBM Calgary IOMMU support"
	select SWIOTLB
	depends on X86_64 && PCI && EXPERIMENTAL
I
Ingo Molnar 已提交
704
	---help---
705 706 707 708 709 710 711 712 713 714 715 716 717 718
	  Support for hardware IOMMUs in IBM's xSeries x366 and x460
	  systems. Needed to run systems with more than 3GB of memory
	  properly with 32-bit PCI devices that do not support DAC
	  (Double Address Cycle). Calgary also supports bus level
	  isolation, where all DMAs pass through the IOMMU.  This
	  prevents them from going anywhere except their intended
	  destination. This catches hard-to-find kernel bugs and
	  mis-behaving drivers and devices that do not use the DMA-API
	  properly to set up their DMA buffers.  The IOMMU can be
	  turned off at boot time with the iommu=off parameter.
	  Normally the kernel will make the right choice by itself.
	  If unsure, say Y.

config CALGARY_IOMMU_ENABLED_BY_DEFAULT
719 720
	def_bool y
	prompt "Should Calgary be enabled by default?"
721
	depends on CALGARY_IOMMU
I
Ingo Molnar 已提交
722
	---help---
723 724 725 726 727 728 729 730
	  Should Calgary be enabled by default? if you choose 'y', Calgary
	  will be used (if it exists). If you choose 'n', Calgary will not be
	  used even if it exists. If you choose 'n' and would like to use
	  Calgary anyway, pass 'iommu=calgary' on the kernel command line.
	  If unsure, say Y.

# need this always selected by IOMMU for the VIA workaround
config SWIOTLB
J
Joerg Roedel 已提交
731
	def_bool y if X86_64
I
Ingo Molnar 已提交
732
	---help---
733 734 735 736 737 738
	  Support for software bounce buffers used on x86-64 systems
	  which don't have a hardware IOMMU (e.g. the current generation
	  of Intel's x86-64 CPUs). Using this PCI devices which can only
	  access 32-bits of memory can be used on systems with more than
	  3 GB of memory. If unsure, say Y.

739
config IOMMU_HELPER
740
	def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU)
741

742
config MAXSMP
743
	bool "Enable Maximum number of SMP Processors and NUMA Nodes"
M
Mike Travis 已提交
744 745
	depends on X86_64 && SMP && DEBUG_KERNEL && EXPERIMENTAL
	select CPUMASK_OFFSTACK
I
Ingo Molnar 已提交
746
	---help---
747
	  Enable maximum number of CPUS and NUMA Nodes for this architecture.
748
	  If unsure, say N.
749 750

config NR_CPUS
M
Mike Travis 已提交
751
	int "Maximum number of CPUs" if SMP && !MAXSMP
752
	range 2 8 if SMP && X86_32 && !X86_BIGSMP
M
Mike Travis 已提交
753
	range 2 512 if SMP && !MAXSMP
M
Mike Travis 已提交
754
	default "1" if !SMP
755
	default "4096" if MAXSMP
M
Mike Travis 已提交
756 757
	default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000)
	default "8" if SMP
I
Ingo Molnar 已提交
758
	---help---
759
	  This allows you to specify the maximum number of CPUs which this
760
	  kernel will support.  The maximum supported value is 512 and the
761 762 763 764 765 766 767
	  minimum value which makes sense is 2.

	  This is purely to save memory - each supported CPU adds
	  approximately eight kilobytes to the kernel image.

config SCHED_SMT
	bool "SMT (Hyperthreading) scheduler support"
768
	depends on X86_HT
I
Ingo Molnar 已提交
769
	---help---
770 771 772 773 774 775
	  SMT scheduler support improves the CPU scheduler's decision making
	  when dealing with Intel Pentium 4 chips with HyperThreading at a
	  cost of slightly increased overhead in some places. If unsure say
	  N here.

config SCHED_MC
776 777
	def_bool y
	prompt "Multi-core scheduler support"
778
	depends on X86_HT
I
Ingo Molnar 已提交
779
	---help---
780 781 782 783
	  Multi-core scheduler support improves the CPU scheduler's decision
	  making when dealing with multi-core CPU chips at a cost of slightly
	  increased overhead in some places. If unsure say N here.

V
Venkatesh Pallipadi 已提交
784 785 786 787 788 789 790 791 792 793 794
config IRQ_TIME_ACCOUNTING
	bool "Fine granularity task level IRQ time accounting"
	default n
	---help---
	  Select this option to enable fine granularity task irq time
	  accounting. This is done by reading a timestamp on each
	  transitions between softirq and hardirq state, so there can be a
	  small performance impact.

	  If in doubt, say N here.

795 796 797 798
source "kernel/Kconfig.preempt"

config X86_UP_APIC
	bool "Local APIC support on uniprocessors"
799
	depends on X86_32 && !SMP && !X86_32_NON_STANDARD
I
Ingo Molnar 已提交
800
	---help---
801 802 803 804 805 806 807 808 809 810 811 812
	  A local APIC (Advanced Programmable Interrupt Controller) is an
	  integrated interrupt controller in the CPU. If you have a single-CPU
	  system which has a processor with a local APIC, you can say Y here to
	  enable and use it. If you say Y here even though your machine doesn't
	  have a local APIC, then the kernel will still run with no slowdown at
	  all. The local APIC supports CPU-generated self-interrupts (timer,
	  performance counters), and the NMI watchdog which detects hard
	  lockups.

config X86_UP_IOAPIC
	bool "IO-APIC support on uniprocessors"
	depends on X86_UP_APIC
I
Ingo Molnar 已提交
813
	---help---
814 815 816 817 818 819 820 821 822
	  An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
	  SMP-capable replacement for PC-style interrupt controllers. Most
	  SMP systems and many recent uniprocessor systems have one.

	  If you have a single-CPU system with an IO-APIC, you can say Y here
	  to use it. If you say Y here even though your machine doesn't have
	  an IO-APIC, then the kernel will still run with no slowdown at all.

config X86_LOCAL_APIC
823
	def_bool y
824
	depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_APIC
825 826

config X86_IO_APIC
827
	def_bool y
828
	depends on X86_64 || SMP || X86_32_NON_STANDARD || X86_UP_IOAPIC
829 830

config X86_VISWS_APIC
831
	def_bool y
832 833
	depends on X86_32 && X86_VISWS

834 835 836
config X86_REROUTE_FOR_BROKEN_BOOT_IRQS
	bool "Reroute for broken boot IRQs"
	depends on X86_IO_APIC
I
Ingo Molnar 已提交
837
	---help---
838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856
	  This option enables a workaround that fixes a source of
	  spurious interrupts. This is recommended when threaded
	  interrupt handling is used on systems where the generation of
	  superfluous "boot interrupts" cannot be disabled.

	  Some chipsets generate a legacy INTx "boot IRQ" when the IRQ
	  entry in the chipset's IO-APIC is masked (as, e.g. the RT
	  kernel does during interrupt handling). On chipsets where this
	  boot IRQ generation cannot be disabled, this workaround keeps
	  the original IRQ line masked so that only the equivalent "boot
	  IRQ" is delivered to the CPUs. The workaround also tells the
	  kernel to set up the IRQ handler on the boot IRQ line. In this
	  way only one interrupt is delivered to the kernel. Otherwise
	  the spurious second interrupt may cause the kernel to bring
	  down (vital) interrupt lines.

	  Only affects "broken" chipsets. Interrupt sharing may be
	  increased on these systems.

857
config X86_MCE
858
	bool "Machine Check / overheating reporting"
859
	---help---
860 861
	  Machine Check support allows the processor to notify the
	  kernel if it detects a problem (e.g. overheating, data corruption).
862
	  The action the kernel takes depends on the severity of the problem,
863
	  ranging from warning messages to halting the machine.
864

865
config X86_MCE_INTEL
866 867
	def_bool y
	prompt "Intel MCE features"
868
	depends on X86_MCE && X86_LOCAL_APIC
I
Ingo Molnar 已提交
869
	---help---
870 871 872 873
	   Additional support for intel specific MCE features such as
	   the thermal monitor.

config X86_MCE_AMD
874 875
	def_bool y
	prompt "AMD MCE features"
876
	depends on X86_MCE && X86_LOCAL_APIC
I
Ingo Molnar 已提交
877
	---help---
878 879 880
	   Additional support for AMD specific MCE features such as
	   the DRAM Error Threshold.

881
config X86_ANCIENT_MCE
J
Jan Beulich 已提交
882
	bool "Support for old Pentium 5 / WinChip machine checks"
883
	depends on X86_32 && X86_MCE
884 885 886 887
	---help---
	  Include support for machine check handling on old Pentium 5 or WinChip
	  systems. These typically need to be enabled explicitely on the command
	  line.
888

889 890
config X86_MCE_THRESHOLD
	depends on X86_MCE_AMD || X86_MCE_INTEL
J
Jan Beulich 已提交
891
	def_bool y
892

893
config X86_MCE_INJECT
894
	depends on X86_MCE
895 896 897 898 899 900
	tristate "Machine check injector support"
	---help---
	  Provide support for injecting machine checks for testing purposes.
	  If you don't know what a machine check is and you don't do kernel
	  QA it is safe to say n.

901 902
config X86_THERMAL_VECTOR
	def_bool y
903
	depends on X86_MCE_INTEL
904

905
config VM86
906
	bool "Enable VM86 support" if EXPERT
907 908
	default y
	depends on X86_32
I
Ingo Molnar 已提交
909 910
	---help---
	  This option is required by programs like DOSEMU to run 16-bit legacy
911
	  code on X86 processors. It also may be needed by software like
I
Ingo Molnar 已提交
912 913
	  XFree86 to initialize some video cards via BIOS. Disabling this
	  option saves about 6k.
914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932

config TOSHIBA
	tristate "Toshiba Laptop support"
	depends on X86_32
	---help---
	  This adds a driver to safely access the System Management Mode of
	  the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
	  not work on models with a Phoenix BIOS. The System Management Mode
	  is used to set the BIOS and power saving options on Toshiba portables.

	  For information on utilities to make use of this driver see the
	  Toshiba Linux utilities web site at:
	  <http://www.buzzard.org.uk/toshiba/>.

	  Say Y if you intend to run this kernel on a Toshiba portable.
	  Say N otherwise.

config I8K
	tristate "Dell laptop support"
933
	select HWMON
934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952
	---help---
	  This adds a driver to safely access the System Management Mode
	  of the CPU on the Dell Inspiron 8000. The System Management Mode
	  is used to read cpu temperature and cooling fan status and to
	  control the fans on the I8K portables.

	  This driver has been tested only on the Inspiron 8000 but it may
	  also work with other Dell laptops. You can force loading on other
	  models by passing the parameter `force=1' to the module. Use at
	  your own risk.

	  For information on utilities to make use of this driver see the
	  I8K Linux utilities web site at:
	  <http://people.debian.org/~dz/i8k/>

	  Say Y if you intend to run this kernel on a Dell Inspiron 8000.
	  Say N otherwise.

config X86_REBOOTFIXUPS
953 954
	bool "Enable X86 board specific fixups for reboot"
	depends on X86_32
955 956 957 958 959 960 961 962
	---help---
	  This enables chipset and/or board specific fixups to be done
	  in order to get reboot to work correctly. This is only needed on
	  some combinations of hardware and BIOS. The symptom, for which
	  this config is intended, is when reboot ends with a stalled/hung
	  system.

	  Currently, the only fixup is for the Geode machines using
963
	  CS5530A and CS5536 chipsets and the RDC R-321x SoC.
964 965 966 967 968 969

	  Say Y if you want to enable the fixup. Currently, it's safe to
	  enable this option even if you don't need it.
	  Say N otherwise.

config MICROCODE
P
Peter Oruba 已提交
970
	tristate "/dev/cpu/microcode - microcode support"
971 972 973
	select FW_LOADER
	---help---
	  If you say Y here, you will be able to update the microcode on
974 975 976 977 978 979
	  certain Intel and AMD processors. The Intel support is for the
	  IA32 family, e.g. Pentium Pro, Pentium II, Pentium III,
	  Pentium 4, Xeon etc. The AMD support is for family 0x10 and
	  0x11 processors, e.g. Opteron, Phenom and Turion 64 Ultra.
	  You will obviously need the actual microcode binary data itself
	  which is not shipped with the Linux kernel.
980

P
Peter Oruba 已提交
981 982
	  This option selects the general module only, you need to select
	  at least one vendor specific module as well.
983 984 985 986

	  To compile this driver as a module, choose M here: the
	  module will be called microcode.

P
Peter Oruba 已提交
987
config MICROCODE_INTEL
I
Ingo Molnar 已提交
988 989 990 991 992 993 994 995 996 997 998
	bool "Intel microcode patch loading support"
	depends on MICROCODE
	default MICROCODE
	select FW_LOADER
	---help---
	  This options enables microcode patch loading support for Intel
	  processors.

	  For latest news and information on obtaining all the required
	  Intel ingredients for this driver, check:
	  <http://www.urbanmyth.org/microcode/>.
P
Peter Oruba 已提交
999

1000
config MICROCODE_AMD
I
Ingo Molnar 已提交
1001 1002 1003 1004 1005 1006
	bool "AMD microcode patch loading support"
	depends on MICROCODE
	select FW_LOADER
	---help---
	  If you select this option, microcode patch loading support for AMD
	  processors will be enabled.
1007

I
Ingo Molnar 已提交
1008
config MICROCODE_OLD_INTERFACE
1009
	def_bool y
1010 1011 1012 1013
	depends on MICROCODE

config X86_MSR
	tristate "/dev/cpu/*/msr - Model-specific register support"
I
Ingo Molnar 已提交
1014
	---help---
1015 1016 1017 1018 1019 1020 1021 1022
	  This device gives privileged processes access to the x86
	  Model-Specific Registers (MSRs).  It is a character device with
	  major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
	  MSR accesses are directed to a specific CPU on multi-processor
	  systems.

config X86_CPUID
	tristate "/dev/cpu/*/cpuid - CPU information support"
I
Ingo Molnar 已提交
1023
	---help---
1024 1025 1026 1027 1028 1029 1030 1031
	  This device gives processes access to the x86 CPUID instruction to
	  be executed on a specific processor.  It is a character device
	  with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
	  /dev/cpu/31/cpuid.

choice
	prompt "High Memory Support"
	default HIGHMEM64G if X86_NUMAQ
J
Jan Beulich 已提交
1032
	default HIGHMEM4G
1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074
	depends on X86_32

config NOHIGHMEM
	bool "off"
	depends on !X86_NUMAQ
	---help---
	  Linux can use up to 64 Gigabytes of physical memory on x86 systems.
	  However, the address space of 32-bit x86 processors is only 4
	  Gigabytes large. That means that, if you have a large amount of
	  physical memory, not all of it can be "permanently mapped" by the
	  kernel. The physical memory that's not permanently mapped is called
	  "high memory".

	  If you are compiling a kernel which will never run on a machine with
	  more than 1 Gigabyte total physical RAM, answer "off" here (default
	  choice and suitable for most users). This will result in a "3GB/1GB"
	  split: 3GB are mapped so that each process sees a 3GB virtual memory
	  space and the remaining part of the 4GB virtual memory space is used
	  by the kernel to permanently map as much physical memory as
	  possible.

	  If the machine has between 1 and 4 Gigabytes physical RAM, then
	  answer "4GB" here.

	  If more than 4 Gigabytes is used then answer "64GB" here. This
	  selection turns Intel PAE (Physical Address Extension) mode on.
	  PAE implements 3-level paging on IA32 processors. PAE is fully
	  supported by Linux, PAE mode is implemented on all recent Intel
	  processors (Pentium Pro and better). NOTE: If you say "64GB" here,
	  then the kernel will not boot on CPUs that don't support PAE!

	  The actual amount of total physical memory will either be
	  auto detected or can be forced by using a kernel command line option
	  such as "mem=256M". (Try "man bootparam" or see the documentation of
	  your boot loader (lilo or loadlin) about how to pass options to the
	  kernel at boot time.)

	  If unsure, say "off".

config HIGHMEM4G
	bool "4GB"
	depends on !X86_NUMAQ
I
Ingo Molnar 已提交
1075
	---help---
1076 1077 1078 1079 1080 1081 1082
	  Select this if you have a 32-bit processor and between 1 and 4
	  gigabytes of physical RAM.

config HIGHMEM64G
	bool "64GB"
	depends on !M386 && !M486
	select X86_PAE
I
Ingo Molnar 已提交
1083
	---help---
1084 1085 1086 1087 1088 1089 1090
	  Select this if you have a 32-bit processor and more than 4
	  gigabytes of physical RAM.

endchoice

choice
	depends on EXPERIMENTAL
1091
	prompt "Memory split" if EXPERT
1092 1093
	default VMSPLIT_3G
	depends on X86_32
I
Ingo Molnar 已提交
1094
	---help---
1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133
	  Select the desired split between kernel and user memory.

	  If the address range available to the kernel is less than the
	  physical memory installed, the remaining memory will be available
	  as "high memory". Accessing high memory is a little more costly
	  than low memory, as it needs to be mapped into the kernel first.
	  Note that increasing the kernel address space limits the range
	  available to user programs, making the address space there
	  tighter.  Selecting anything other than the default 3G/1G split
	  will also likely make your kernel incompatible with binary-only
	  kernel modules.

	  If you are not absolutely sure what you are doing, leave this
	  option alone!

	config VMSPLIT_3G
		bool "3G/1G user/kernel split"
	config VMSPLIT_3G_OPT
		depends on !X86_PAE
		bool "3G/1G user/kernel split (for full 1G low memory)"
	config VMSPLIT_2G
		bool "2G/2G user/kernel split"
	config VMSPLIT_2G_OPT
		depends on !X86_PAE
		bool "2G/2G user/kernel split (for full 2G low memory)"
	config VMSPLIT_1G
		bool "1G/3G user/kernel split"
endchoice

config PAGE_OFFSET
	hex
	default 0xB0000000 if VMSPLIT_3G_OPT
	default 0x80000000 if VMSPLIT_2G
	default 0x78000000 if VMSPLIT_2G_OPT
	default 0x40000000 if VMSPLIT_1G
	default 0xC0000000
	depends on X86_32

config HIGHMEM
1134
	def_bool y
1135 1136 1137
	depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)

config X86_PAE
1138
	bool "PAE (Physical Address Extension) Support"
1139
	depends on X86_32 && !HIGHMEM4G
I
Ingo Molnar 已提交
1140
	---help---
1141 1142 1143 1144 1145
	  PAE is required for NX support, and furthermore enables
	  larger swapspace support for non-overcommit purposes. It
	  has the cost of more pagetable lookup overhead, and also
	  consumes more pagetable space per process.

1146
config ARCH_PHYS_ADDR_T_64BIT
I
Ingo Molnar 已提交
1147
	def_bool X86_64 || X86_PAE
1148

1149 1150 1151
config ARCH_DMA_ADDR_T_64BIT
	def_bool X86_64 || HIGHMEM64G

1152
config DIRECT_GBPAGES
1153
	bool "Enable 1GB pages for kernel pagetables" if EXPERT
1154 1155
	default y
	depends on X86_64
I
Ingo Molnar 已提交
1156
	---help---
1157 1158 1159 1160
	  Allow the kernel linear mapping to use 1GB pages on CPUs that
	  support it. This can improve the kernel's performance a tiny bit by
	  reducing TLB pressure. If in doubt, say "Y".

1161 1162
# Common NUMA Features
config NUMA
1163
	bool "Numa Memory Allocation and Scheduler Support"
1164
	depends on SMP
1165
	depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL)
1166
	default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
I
Ingo Molnar 已提交
1167
	---help---
1168
	  Enable NUMA (Non Uniform Memory Access) support.
1169

1170 1171 1172 1173
	  The kernel will try to allocate memory used by a CPU on the
	  local memory controller of the CPU and add some more
	  NUMA awareness to the kernel.

1174
	  For 64-bit this is recommended if the system is Intel Core i7
1175 1176 1177 1178 1179 1180 1181
	  (or later), AMD Opteron, or EM64T NUMA.

	  For 32-bit this is only needed on (rare) 32-bit-only platforms
	  that support NUMA topologies, such as NUMAQ / Summit, or if you
	  boot a 32-bit kernel on a 64-bit NUMA platform.

	  Otherwise, you should say N.
1182 1183 1184 1185

comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
	depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI)

1186
config AMD_NUMA
1187 1188
	def_bool y
	prompt "Old style AMD Opteron NUMA detection"
1189
	depends on X86_64 && NUMA && PCI
I
Ingo Molnar 已提交
1190
	---help---
1191 1192 1193 1194 1195
	  Enable AMD NUMA node topology detection.  You should say Y here if
	  you have a multi processor AMD system. This uses an old method to
	  read the NUMA configuration directly from the builtin Northbridge
	  of Opteron. It is recommended to use X86_64_ACPI_NUMA instead,
	  which also takes priority if both are compiled in.
1196 1197

config X86_64_ACPI_NUMA
1198 1199
	def_bool y
	prompt "ACPI NUMA detection"
1200 1201
	depends on X86_64 && NUMA && ACPI && PCI
	select ACPI_NUMA
I
Ingo Molnar 已提交
1202
	---help---
1203 1204
	  Enable ACPI SRAT based node topology detection.

1205 1206 1207 1208 1209 1210 1211 1212 1213
# Some NUMA nodes have memory ranges that span
# other nodes.  Even though a pfn is valid and
# between a node's start and end pfns, it may not
# reside on that node.  See memmap_init_zone()
# for details.
config NODES_SPAN_OTHER_NODES
	def_bool y
	depends on X86_64_ACPI_NUMA

1214 1215
config NUMA_EMU
	bool "NUMA emulation"
1216
	depends on NUMA
I
Ingo Molnar 已提交
1217
	---help---
1218 1219 1220 1221 1222
	  Enable NUMA emulation. A flat machine will be split
	  into virtual nodes when booted with "numa=fake=N", where N is the
	  number of nodes. This is only useful for debugging.

config NODES_SHIFT
1223
	int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP
1224 1225
	range 1 10
	default "10" if MAXSMP
1226 1227 1228 1229
	default "6" if X86_64
	default "4" if X86_NUMAQ
	default "3"
	depends on NEED_MULTIPLE_NODES
I
Ingo Molnar 已提交
1230
	---help---
1231
	  Specify the maximum number of NUMA Nodes available on the target
1232
	  system.  Increases memory reserved to accommodate various tables.
1233

1234
config HAVE_ARCH_BOOTMEM
1235
	def_bool y
1236 1237
	depends on X86_32 && NUMA

1238 1239 1240 1241
config HAVE_ARCH_ALLOC_REMAP
	def_bool y
	depends on X86_32 && NUMA

1242
config ARCH_HAVE_MEMORY_PRESENT
1243
	def_bool y
1244 1245 1246
	depends on X86_32 && DISCONTIGMEM

config NEED_NODE_MEMMAP_SIZE
1247
	def_bool y
1248 1249 1250 1251
	depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)

config ARCH_FLATMEM_ENABLE
	def_bool y
1252
	depends on X86_32 && !NUMA
1253 1254 1255

config ARCH_DISCONTIGMEM_ENABLE
	def_bool y
1256
	depends on NUMA && X86_32
1257 1258 1259

config ARCH_DISCONTIGMEM_DEFAULT
	def_bool y
1260 1261
	depends on NUMA && X86_32

1262 1263
config ARCH_SPARSEMEM_ENABLE
	def_bool y
1264
	depends on X86_64 || NUMA || (EXPERIMENTAL && X86_32) || X86_32_NON_STANDARD
1265 1266 1267
	select SPARSEMEM_STATIC if X86_32
	select SPARSEMEM_VMEMMAP_ENABLE if X86_64

1268 1269 1270 1271
config ARCH_SPARSEMEM_DEFAULT
	def_bool y
	depends on X86_64

1272 1273
config ARCH_SELECT_MEMORY_MODEL
	def_bool y
1274
	depends on ARCH_SPARSEMEM_ENABLE
1275 1276 1277 1278 1279

config ARCH_MEMORY_PROBE
	def_bool X86_64
	depends on MEMORY_HOTPLUG

1280 1281 1282 1283
config ARCH_PROC_KCORE_TEXT
	def_bool y
	depends on X86_64 && PROC_KCORE

1284 1285 1286 1287 1288
config ILLEGAL_POINTER_VALUE
       hex
       default 0 if X86_32
       default 0xdead000000000000 if X86_64

1289 1290 1291 1292
source "mm/Kconfig"

config HIGHPTE
	bool "Allocate 3rd-level pagetables from highmem"
J
Jan Beulich 已提交
1293
	depends on HIGHMEM
I
Ingo Molnar 已提交
1294
	---help---
1295 1296 1297 1298 1299
	  The VM uses one page table entry for each page of physical memory.
	  For systems with a lot of RAM, this can be wasteful of precious
	  low memory.  Setting this option will put user-space page table
	  entries in high memory.

1300
config X86_CHECK_BIOS_CORRUPTION
I
Ingo Molnar 已提交
1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320
	bool "Check for low memory corruption"
	---help---
	  Periodically check for memory corruption in low memory, which
	  is suspected to be caused by BIOS.  Even when enabled in the
	  configuration, it is disabled at runtime.  Enable it by
	  setting "memory_corruption_check=1" on the kernel command
	  line.  By default it scans the low 64k of memory every 60
	  seconds; see the memory_corruption_check_size and
	  memory_corruption_check_period parameters in
	  Documentation/kernel-parameters.txt to adjust this.

	  When enabled with the default parameters, this option has
	  almost no overhead, as it reserves a relatively small amount
	  of memory and scans it infrequently.  It both detects corruption
	  and prevents it from affecting the running system.

	  It is, however, intended as a diagnostic tool; if repeatable
	  BIOS-originated corruption always affects the same memory,
	  you can use memmap= to prevent the kernel from using that
	  memory.
1321

1322
config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK
I
Ingo Molnar 已提交
1323
	bool "Set the default setting of memory_corruption_check"
1324 1325
	depends on X86_CHECK_BIOS_CORRUPTION
	default y
I
Ingo Molnar 已提交
1326 1327 1328
	---help---
	  Set whether the default state of memory_corruption_check is
	  on or off.
1329

1330
config X86_RESERVE_LOW
1331 1332 1333
	int "Amount of low memory, in kilobytes, to reserve for the BIOS"
	default 64
	range 4 640
I
Ingo Molnar 已提交
1334
	---help---
1335 1336 1337 1338 1339 1340 1341 1342 1343
	  Specify the amount of low memory to reserve for the BIOS.

	  The first page contains BIOS data structures that the kernel
	  must not use, so that page must always be reserved.

	  By default we reserve the first 64K of physical RAM, as a
	  number of BIOSes are known to corrupt that memory range
	  during events such as suspend/resume or monitor cable
	  insertion, so it must not be used by the kernel.
I
Ingo Molnar 已提交
1344

1345 1346 1347 1348 1349
	  You can set this to 4 if you are absolutely sure that you
	  trust the BIOS to get all its memory reservations and usages
	  right.  If you know your BIOS have problems beyond the
	  default 64K area, you can set this to 640 to avoid using the
	  entire low memory range.
I
Ingo Molnar 已提交
1350

1351 1352 1353 1354 1355
	  If you have doubts about the BIOS (e.g. suspend/resume does
	  not work or there's kernel crashes after certain hardware
	  hotplug events) then you might want to enable
	  X86_CHECK_BIOS_CORRUPTION=y to allow the kernel to check
	  typical corruption patterns.
I
Ingo Molnar 已提交
1356

1357
	  Leave this to the default value of 64 if you are unsure.
I
Ingo Molnar 已提交
1358

1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385
config MATH_EMULATION
	bool
	prompt "Math emulation" if X86_32
	---help---
	  Linux can emulate a math coprocessor (used for floating point
	  operations) if you don't have one. 486DX and Pentium processors have
	  a math coprocessor built in, 486SX and 386 do not, unless you added
	  a 487DX or 387, respectively. (The messages during boot time can
	  give you some hints here ["man dmesg"].) Everyone needs either a
	  coprocessor or this emulation.

	  If you don't have a math coprocessor, you need to say Y here; if you
	  say Y here even though you have a coprocessor, the coprocessor will
	  be used nevertheless. (This behavior can be changed with the kernel
	  command line option "no387", which comes handy if your coprocessor
	  is broken. Try "man bootparam" or see the documentation of your boot
	  loader (lilo or loadlin) about how to pass options to the kernel at
	  boot time.) This means that it is a good idea to say Y here if you
	  intend to use this kernel on different machines.

	  More information about the internals of the Linux math coprocessor
	  emulation can be found in <file:arch/x86/math-emu/README>.

	  If you are not sure, say Y; apart from resulting in a 66 KB bigger
	  kernel, it won't hurt.

config MTRR
J
Jan Beulich 已提交
1386
	def_bool y
1387
	prompt "MTRR (Memory Type Range Register) support" if EXPERT
1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417
	---help---
	  On Intel P6 family processors (Pentium Pro, Pentium II and later)
	  the Memory Type Range Registers (MTRRs) may be used to control
	  processor access to memory ranges. This is most useful if you have
	  a video (VGA) card on a PCI or AGP bus. Enabling write-combining
	  allows bus write transfers to be combined into a larger transfer
	  before bursting over the PCI/AGP bus. This can increase performance
	  of image write operations 2.5 times or more. Saying Y here creates a
	  /proc/mtrr file which may be used to manipulate your processor's
	  MTRRs. Typically the X server should use this.

	  This code has a reasonably generic interface so that similar
	  control registers on other processors can be easily supported
	  as well:

	  The Cyrix 6x86, 6x86MX and M II processors have Address Range
	  Registers (ARRs) which provide a similar functionality to MTRRs. For
	  these, the ARRs are used to emulate the MTRRs.
	  The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
	  MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
	  write-combining. All of these processors are supported by this code
	  and it makes sense to say Y here if you have one of them.

	  Saying Y here also fixes a problem with buggy SMP BIOSes which only
	  set the MTRRs for the boot CPU and not for the secondary CPUs. This
	  can lead to all sorts of problems, so it's good to say Y here.

	  You can safely say Y even if your machine doesn't have MTRRs, you'll
	  just add about 9 KB to your kernel.

1418
	  See <file:Documentation/x86/mtrr.txt> for more information.
1419

1420
config MTRR_SANITIZER
1421
	def_bool y
1422 1423
	prompt "MTRR cleanup support"
	depends on MTRR
I
Ingo Molnar 已提交
1424
	---help---
T
Thomas Gleixner 已提交
1425 1426
	  Convert MTRR layout from continuous to discrete, so X drivers can
	  add writeback entries.
1427

T
Thomas Gleixner 已提交
1428
	  Can be disabled with disable_mtrr_cleanup on the kernel command line.
1429
	  The largest mtrr entry size for a continuous block can be set with
T
Thomas Gleixner 已提交
1430
	  mtrr_chunk_size.
1431

1432
	  If unsure, say Y.
1433 1434

config MTRR_SANITIZER_ENABLE_DEFAULT
1435 1436 1437
	int "MTRR cleanup enable value (0-1)"
	range 0 1
	default "0"
1438
	depends on MTRR_SANITIZER
I
Ingo Molnar 已提交
1439
	---help---
1440
	  Enable mtrr cleanup default value
1441

1442 1443 1444 1445 1446
config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
	int "MTRR cleanup spare reg num (0-7)"
	range 0 7
	default "1"
	depends on MTRR_SANITIZER
I
Ingo Molnar 已提交
1447
	---help---
1448
	  mtrr cleanup spare entries default, it can be changed via
T
Thomas Gleixner 已提交
1449
	  mtrr_spare_reg_nr=N on the kernel command line.
1450

1451
config X86_PAT
J
Jan Beulich 已提交
1452
	def_bool y
1453
	prompt "x86 PAT support" if EXPERT
1454
	depends on MTRR
I
Ingo Molnar 已提交
1455
	---help---
1456
	  Use PAT attributes to setup page level cache control.
1457

1458 1459 1460 1461
	  PATs are the modern equivalents of MTRRs and are much more
	  flexible than MTRRs.

	  Say N here if you see bootup problems (boot crash, boot hang,
1462
	  spontaneous reboots) or a non-working video driver.
1463 1464 1465

	  If unsure, say Y.

1466 1467 1468 1469
config ARCH_USES_PG_UNCACHED
	def_bool y
	depends on X86_PAT

1470 1471 1472 1473 1474 1475 1476 1477 1478
config ARCH_RANDOM
	def_bool y
	prompt "x86 architectural random number generator" if EXPERT
	---help---
	  Enable the x86 architectural RDRAND instruction
	  (Intel Bull Mountain technology) to generate random numbers.
	  If supported, this is a high bandwidth, cryptographically
	  secure hardware random number generator.

1479
config EFI
1480
	bool "EFI runtime service support"
H
Huang, Ying 已提交
1481
	depends on ACPI
1482
	---help---
I
Ingo Molnar 已提交
1483 1484
	  This enables the kernel to use EFI runtime services that are
	  available (such as the EFI variable services).
1485

I
Ingo Molnar 已提交
1486 1487 1488 1489 1490 1491
	  This option is only useful on systems that have EFI firmware.
	  In addition, you should use the latest ELILO loader available
	  at <http://elilo.sourceforge.net> in order to take advantage
	  of EFI runtime services. However, even with this option, the
	  resultant kernel should continue to boot on existing non-EFI
	  platforms.
1492 1493

config SECCOMP
1494 1495
	def_bool y
	prompt "Enable seccomp to safely compute untrusted bytecode"
I
Ingo Molnar 已提交
1496
	---help---
1497 1498 1499 1500 1501 1502
	  This kernel feature is useful for number crunching applications
	  that may need to compute untrusted bytecode during their
	  execution. By using pipes or other transports made available to
	  the process as file descriptors supporting the read/write
	  syscalls, it's possible to isolate those applications in
	  their own address space using seccomp. Once seccomp is
1503
	  enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
1504 1505 1506 1507 1508 1509 1510
	  and the task is only allowed to execute a few safe syscalls
	  defined by each seccomp mode.

	  If unsure, say Y. Only embedded should say N here.

config CC_STACKPROTECTOR
	bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
I
Ingo Molnar 已提交
1511 1512
	---help---
	  This option turns on the -fstack-protector GCC feature. This
I
Ingo Molnar 已提交
1513 1514
	  feature puts, at the beginning of functions, a canary value on
	  the stack just before the return address, and validates
1515 1516 1517 1518 1519 1520 1521
	  the value just before actually returning.  Stack based buffer
	  overflows (that need to overwrite this return address) now also
	  overwrite the canary, which gets detected and the attack is then
	  neutralized via a kernel panic.

	  This feature requires gcc version 4.2 or above, or a distribution
	  gcc with the feature backported. Older versions are automatically
I
Ingo Molnar 已提交
1522 1523
	  detected and for those versions, this configuration option is
	  ignored. (and a warning is printed during bootup)
1524 1525 1526 1527 1528

source kernel/Kconfig.hz

config KEXEC
	bool "kexec system call"
I
Ingo Molnar 已提交
1529
	---help---
1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543
	  kexec is a system call that implements the ability to shutdown your
	  current kernel, and to start another kernel.  It is like a reboot
	  but it is independent of the system firmware.   And like a reboot
	  you can start any kernel with it, not just Linux.

	  The name comes from the similarity to the exec system call.

	  It is an ongoing process to be certain the hardware in a machine
	  is properly shutdown, so do not be surprised if this code does not
	  initially work for you.  It may help to enable device hotplugging
	  support.  As of this writing the exact hardware interface is
	  strongly in flux, so no good recommendation can be made.

config CRASH_DUMP
1544
	bool "kernel crash dumps"
1545
	depends on X86_64 || (X86_32 && HIGHMEM)
I
Ingo Molnar 已提交
1546
	---help---
1547 1548 1549 1550 1551 1552 1553 1554 1555 1556
	  Generate crash dump after being started by kexec.
	  This should be normally only set in special crash dump kernels
	  which are loaded in the main kernel with kexec-tools into
	  a specially reserved region and then later executed after
	  a crash by kdump/kexec. The crash dump kernel must be compiled
	  to a memory address not used by the main kernel or BIOS using
	  PHYSICAL_START, or it must be built as a relocatable image
	  (CONFIG_RELOCATABLE=y).
	  For more details see Documentation/kdump/kdump.txt

H
Huang Ying 已提交
1557 1558 1559
config KEXEC_JUMP
	bool "kexec jump (EXPERIMENTAL)"
	depends on EXPERIMENTAL
1560
	depends on KEXEC && HIBERNATION
I
Ingo Molnar 已提交
1561
	---help---
1562 1563
	  Jump between original kernel and kexeced kernel and invoke
	  code in physical address mode via KEXEC
H
Huang Ying 已提交
1564

1565
config PHYSICAL_START
1566
	hex "Physical address where the kernel is loaded" if (EXPERT || CRASH_DUMP)
1567
	default "0x1000000"
I
Ingo Molnar 已提交
1568
	---help---
1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585
	  This gives the physical address where the kernel is loaded.

	  If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
	  bzImage will decompress itself to above physical address and
	  run from there. Otherwise, bzImage will run from the address where
	  it has been loaded by the boot loader and will ignore above physical
	  address.

	  In normal kdump cases one does not have to set/change this option
	  as now bzImage can be compiled as a completely relocatable image
	  (CONFIG_RELOCATABLE=y) and be used to load and run from a different
	  address. This option is mainly useful for the folks who don't want
	  to use a bzImage for capturing the crash dump and want to use a
	  vmlinux instead. vmlinux is not relocatable hence a kernel needs
	  to be specifically compiled to run from a specific memory area
	  (normally a reserved region) and this option comes handy.

1586 1587 1588 1589 1590 1591 1592 1593 1594
	  So if you are using bzImage for capturing the crash dump,
	  leave the value here unchanged to 0x1000000 and set
	  CONFIG_RELOCATABLE=y.  Otherwise if you plan to use vmlinux
	  for capturing the crash dump change this value to start of
	  the reserved region.  In other words, it can be set based on
	  the "X" value as specified in the "crashkernel=YM@XM"
	  command line boot parameter passed to the panic-ed
	  kernel. Please take a look at Documentation/kdump/kdump.txt
	  for more details about crash dumps.
1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606

	  Usage of bzImage for capturing the crash dump is recommended as
	  one does not have to build two kernels. Same kernel can be used
	  as production kernel and capture kernel. Above option should have
	  gone away after relocatable bzImage support is introduced. But it
	  is present because there are users out there who continue to use
	  vmlinux for dump capture. This option should go away down the
	  line.

	  Don't change this unless you know what you are doing.

config RELOCATABLE
1607 1608
	bool "Build a relocatable kernel"
	default y
I
Ingo Molnar 已提交
1609
	---help---
1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622
	  This builds a kernel image that retains relocation information
	  so it can be loaded someplace besides the default 1MB.
	  The relocations tend to make the kernel binary about 10% larger,
	  but are discarded at runtime.

	  One use is for the kexec on panic case where the recovery kernel
	  must live at a different physical address than the primary
	  kernel.

	  Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
	  it has been loaded at and the compile time physical address
	  (CONFIG_PHYSICAL_START) is ignored.

1623 1624 1625 1626 1627
# Relocation on x86-32 needs some additional build support
config X86_NEED_RELOCS
	def_bool y
	depends on X86_32 && RELOCATABLE

1628
config PHYSICAL_ALIGN
J
Jan Beulich 已提交
1629
	hex "Alignment value to which kernel should be aligned" if X86_32
1630 1631
	default "0x1000000"
	range 0x2000 0x1000000
I
Ingo Molnar 已提交
1632
	---help---
1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651
	  This value puts the alignment restrictions on physical address
	  where kernel is loaded and run from. Kernel is compiled for an
	  address which meets above alignment restriction.

	  If bootloader loads the kernel at a non-aligned address and
	  CONFIG_RELOCATABLE is set, kernel will move itself to nearest
	  address aligned to above value and run from there.

	  If bootloader loads the kernel at a non-aligned address and
	  CONFIG_RELOCATABLE is not set, kernel will ignore the run time
	  load address and decompress itself to the address it has been
	  compiled for and run from there. The address for which kernel is
	  compiled already meets above alignment restrictions. Hence the
	  end result is that kernel runs from a physical address meeting
	  above alignment restrictions.

	  Don't change this unless you know what you are doing.

config HOTPLUG_CPU
1652
	bool "Support for hot-pluggable CPUs"
1653
	depends on SMP && HOTPLUG
1654
	---help---
1655 1656 1657 1658 1659
	  Say Y here to allow turning CPUs off and on. CPUs can be
	  controlled through /sys/devices/system/cpu.
	  ( Note: power management support will enable this option
	    automatically on SMP systems. )
	  Say N if you want to disable CPU hotplug.
1660 1661

config COMPAT_VDSO
1662 1663
	def_bool y
	prompt "Compat VDSO support"
R
Roland McGrath 已提交
1664
	depends on X86_32 || IA32_EMULATION
I
Ingo Molnar 已提交
1665
	---help---
R
Roland McGrath 已提交
1666
	  Map the 32-bit VDSO to the predictable old-style address too.
R
Randy Dunlap 已提交
1667

1668 1669 1670 1671 1672 1673
	  Say N here if you are running a sufficiently recent glibc
	  version (2.3.3 or later), to remove the high-mapped
	  VDSO mapping and to exclusively use the randomized VDSO.

	  If unsure, say Y.

1674 1675
config CMDLINE_BOOL
	bool "Built-in kernel command line"
I
Ingo Molnar 已提交
1676
	---help---
1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693
	  Allow for specifying boot arguments to the kernel at
	  build time.  On some systems (e.g. embedded ones), it is
	  necessary or convenient to provide some or all of the
	  kernel boot arguments with the kernel itself (that is,
	  to not rely on the boot loader to provide them.)

	  To compile command line arguments into the kernel,
	  set this option to 'Y', then fill in the
	  the boot arguments in CONFIG_CMDLINE.

	  Systems with fully functional boot loaders (i.e. non-embedded)
	  should leave this option set to 'N'.

config CMDLINE
	string "Built-in kernel command string"
	depends on CMDLINE_BOOL
	default ""
I
Ingo Molnar 已提交
1694
	---help---
1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709
	  Enter arguments here that should be compiled into the kernel
	  image and used at boot time.  If the boot loader provides a
	  command line at boot time, it is appended to this string to
	  form the full kernel command line, when the system boots.

	  However, you can use the CONFIG_CMDLINE_OVERRIDE option to
	  change this behavior.

	  In most cases, the command line (whether built-in or provided
	  by the boot loader) should specify the device for the root
	  file system.

config CMDLINE_OVERRIDE
	bool "Built-in command line overrides boot loader arguments"
	depends on CMDLINE_BOOL
I
Ingo Molnar 已提交
1710
	---help---
1711 1712 1713 1714 1715 1716
	  Set this option to 'Y' to have the kernel ignore the boot loader
	  command line, and use ONLY the built-in command line.

	  This is used to work around broken boot loaders.  This should
	  be set to 'N' under normal conditions.

1717 1718 1719 1720 1721 1722
endmenu

config ARCH_ENABLE_MEMORY_HOTPLUG
	def_bool y
	depends on X86_64 || (X86_32 && HIGHMEM)

1723 1724 1725 1726
config ARCH_ENABLE_MEMORY_HOTREMOVE
	def_bool y
	depends on MEMORY_HOTPLUG

1727
config USE_PERCPU_NUMA_NODE_ID
1728
	def_bool y
1729 1730
	depends on NUMA

1731
menu "Power management and ACPI options"
1732 1733

config ARCH_HIBERNATION_HEADER
1734
	def_bool y
1735 1736 1737 1738 1739 1740
	depends on X86_64 && HIBERNATION

source "kernel/power/Kconfig"

source "drivers/acpi/Kconfig"

F
Feng Tang 已提交
1741 1742
source "drivers/sfi/Kconfig"

1743
config X86_APM_BOOT
J
Jan Beulich 已提交
1744
	def_bool y
1745
	depends on APM
1746

1747 1748
menuconfig APM
	tristate "APM (Advanced Power Management) BIOS support"
1749
	depends on X86_32 && PM_SLEEP
1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764
	---help---
	  APM is a BIOS specification for saving power using several different
	  techniques. This is mostly useful for battery powered laptops with
	  APM compliant BIOSes. If you say Y here, the system time will be
	  reset after a RESUME operation, the /proc/apm device will provide
	  battery status information, and user-space programs will receive
	  notification of APM "events" (e.g. battery status change).

	  If you select "Y" here, you can disable actual use of the APM
	  BIOS by passing the "apm=off" option to the kernel at boot time.

	  Note that the APM support is almost completely disabled for
	  machines with more than one CPU.

	  In order to use APM, you will need supporting software. For location
1765 1766
	  and more information, read <file:Documentation/power/apm-acpi.txt>
	  and the Battery Powered Linux mini-HOWTO, available from
1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809
	  <http://www.tldp.org/docs.html#howto>.

	  This driver does not spin down disk drives (see the hdparm(8)
	  manpage ("man 8 hdparm") for that), and it doesn't turn off
	  VESA-compliant "green" monitors.

	  This driver does not support the TI 4000M TravelMate and the ACER
	  486/DX4/75 because they don't have compliant BIOSes. Many "green"
	  desktop machines also don't have compliant BIOSes, and this driver
	  may cause those machines to panic during the boot phase.

	  Generally, if you don't have a battery in your machine, there isn't
	  much point in using this driver and you should say N. If you get
	  random kernel OOPSes or reboots that don't seem to be related to
	  anything, try disabling/enabling this option (or disabling/enabling
	  APM in your BIOS).

	  Some other things you should try when experiencing seemingly random,
	  "weird" problems:

	  1) make sure that you have enough swap space and that it is
	  enabled.
	  2) pass the "no-hlt" option to the kernel
	  3) switch on floating point emulation in the kernel and pass
	  the "no387" option to the kernel
	  4) pass the "floppy=nodma" option to the kernel
	  5) pass the "mem=4M" option to the kernel (thereby disabling
	  all but the first 4 MB of RAM)
	  6) make sure that the CPU is not over clocked.
	  7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
	  8) disable the cache from your BIOS settings
	  9) install a fan for the video card or exchange video RAM
	  10) install a better fan for the CPU
	  11) exchange RAM chips
	  12) exchange the motherboard.

	  To compile this driver as a module, choose M here: the
	  module will be called apm.

if APM

config APM_IGNORE_USER_SUSPEND
	bool "Ignore USER SUSPEND"
I
Ingo Molnar 已提交
1810
	---help---
1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833
	  This option will ignore USER SUSPEND requests. On machines with a
	  compliant APM BIOS, you want to say N. However, on the NEC Versa M
	  series notebooks, it is necessary to say Y because of a BIOS bug.

config APM_DO_ENABLE
	bool "Enable PM at boot time"
	---help---
	  Enable APM features at boot time. From page 36 of the APM BIOS
	  specification: "When disabled, the APM BIOS does not automatically
	  power manage devices, enter the Standby State, enter the Suspend
	  State, or take power saving steps in response to CPU Idle calls."
	  This driver will make CPU Idle calls when Linux is idle (unless this
	  feature is turned off -- see "Do CPU IDLE calls", below). This
	  should always save battery power, but more complicated APM features
	  will be dependent on your BIOS implementation. You may need to turn
	  this option off if your computer hangs at boot time when using APM
	  support, or if it beeps continuously instead of suspending. Turn
	  this off if you have a NEC UltraLite Versa 33/C or a Toshiba
	  T400CDT. This is off by default since most machines do fine without
	  this feature.

config APM_CPU_IDLE
	bool "Make CPU Idle calls when idle"
I
Ingo Molnar 已提交
1834
	---help---
1835 1836 1837 1838 1839 1840 1841 1842 1843 1844
	  Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
	  On some machines, this can activate improved power savings, such as
	  a slowed CPU clock rate, when the machine is idle. These idle calls
	  are made after the idle loop has run for some length of time (e.g.,
	  333 mS). On some machines, this will cause a hang at boot time or
	  whenever the CPU becomes idle. (On machines with more than one CPU,
	  this option does nothing.)

config APM_DISPLAY_BLANK
	bool "Enable console blanking using APM"
I
Ingo Molnar 已提交
1845
	---help---
1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857
	  Enable console blanking using the APM. Some laptops can use this to
	  turn off the LCD backlight when the screen blanker of the Linux
	  virtual console blanks the screen. Note that this is only used by
	  the virtual console screen blanker, and won't turn off the backlight
	  when using the X Window system. This also doesn't have anything to
	  do with your VESA-compliant power-saving monitor. Further, this
	  option doesn't work for all laptops -- it might not turn off your
	  backlight at all, or it might print a lot of errors to the console,
	  especially if you are using gpm.

config APM_ALLOW_INTS
	bool "Allow interrupts during APM BIOS calls"
I
Ingo Molnar 已提交
1858
	---help---
1859 1860 1861 1862 1863 1864 1865 1866 1867
	  Normally we disable external interrupts while we are making calls to
	  the APM BIOS as a measure to lessen the effects of a badly behaving
	  BIOS implementation.  The BIOS should reenable interrupts if it
	  needs to.  Unfortunately, some BIOSes do not -- especially those in
	  many of the newer IBM Thinkpads.  If you experience hangs when you
	  suspend, try setting this to Y.  Otherwise, say N.

endif # APM

1868
source "drivers/cpufreq/Kconfig"
1869 1870 1871

source "drivers/cpuidle/Kconfig"

A
Andy Henroid 已提交
1872 1873
source "drivers/idle/Kconfig"

1874 1875 1876 1877 1878 1879
endmenu


menu "Bus options (PCI etc.)"

config PCI
I
Ingo Molnar 已提交
1880
	bool "PCI support"
A
Adrian Bunk 已提交
1881
	default y
1882
	select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
I
Ingo Molnar 已提交
1883
	---help---
1884 1885 1886 1887 1888 1889 1890
	  Find out whether you have a PCI motherboard. PCI is the name of a
	  bus system, i.e. the way the CPU talks to the other stuff inside
	  your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
	  VESA. If you have PCI, say Y, otherwise N.

choice
	prompt "PCI access mode"
1891
	depends on X86_32 && PCI
1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916
	default PCI_GOANY
	---help---
	  On PCI systems, the BIOS can be used to detect the PCI devices and
	  determine their configuration. However, some old PCI motherboards
	  have BIOS bugs and may crash if this is done. Also, some embedded
	  PCI-based systems don't have any BIOS at all. Linux can also try to
	  detect the PCI hardware directly without using the BIOS.

	  With this option, you can specify how Linux should detect the
	  PCI devices. If you choose "BIOS", the BIOS will be used,
	  if you choose "Direct", the BIOS won't be used, and if you
	  choose "MMConfig", then PCI Express MMCONFIG will be used.
	  If you choose "Any", the kernel will try MMCONFIG, then the
	  direct access method and falls back to the BIOS if that doesn't
	  work. If unsure, go with the default, which is "Any".

config PCI_GOBIOS
	bool "BIOS"

config PCI_GOMMCONFIG
	bool "MMConfig"

config PCI_GODIRECT
	bool "Direct"

1917
config PCI_GOOLPC
1918
	bool "OLPC XO-1"
1919 1920
	depends on OLPC

1921 1922 1923
config PCI_GOANY
	bool "Any"

1924 1925 1926
endchoice

config PCI_BIOS
1927
	def_bool y
1928
	depends on X86_32 && PCI && (PCI_GOBIOS || PCI_GOANY)
1929 1930 1931

# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
config PCI_DIRECT
1932
	def_bool y
1933
	depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC || PCI_GOMMCONFIG))
1934 1935

config PCI_MMCONFIG
1936
	def_bool y
F
Feng Tang 已提交
1937
	depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY)
1938

1939
config PCI_OLPC
1940 1941
	def_bool y
	depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
1942

1943 1944 1945 1946 1947
config PCI_XEN
	def_bool y
	depends on PCI && XEN
	select SWIOTLB_XEN

1948
config PCI_DOMAINS
1949
	def_bool y
1950 1951 1952 1953 1954 1955
	depends on PCI

config PCI_MMCONFIG
	bool "Support mmconfig PCI config space access"
	depends on X86_64 && PCI && ACPI

1956
config PCI_CNB20LE_QUIRK
1957
	bool "Read CNB20LE Host Bridge Windows" if EXPERT
1958 1959
	default n
	depends on PCI && EXPERIMENTAL
1960 1961 1962 1963 1964
	help
	  Read the PCI windows out of the CNB20LE host bridge. This allows
	  PCI hotplug to work on systems with the CNB20LE chipset which do
	  not have ACPI.

1965 1966 1967 1968 1969
	  There's no public spec for this chipset, and this functionality
	  is known to be incomplete.

	  You should say N unless you know you need this.

1970 1971 1972 1973
source "drivers/pci/pcie/Kconfig"

source "drivers/pci/Kconfig"

1974
# x86_64 have no ISA slots, but can have ISA-style DMA.
1975
config ISA_DMA_API
1976 1977 1978 1979 1980
	bool "ISA-style DMA support" if (X86_64 && EXPERT)
	default y
	help
	  Enables ISA-style DMA support for devices requiring such controllers.
	  If unsure, say Y.
1981 1982 1983 1984 1985

if X86_32

config ISA
	bool "ISA support"
I
Ingo Molnar 已提交
1986
	---help---
1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011
	  Find out whether you have ISA slots on your motherboard.  ISA is the
	  name of a bus system, i.e. the way the CPU talks to the other stuff
	  inside your box.  Other bus systems are PCI, EISA, MicroChannel
	  (MCA) or VESA.  ISA is an older system, now being displaced by PCI;
	  newer boards don't support it.  If you have ISA, say Y, otherwise N.

config EISA
	bool "EISA support"
	depends on ISA
	---help---
	  The Extended Industry Standard Architecture (EISA) bus was
	  developed as an open alternative to the IBM MicroChannel bus.

	  The EISA bus provided some of the features of the IBM MicroChannel
	  bus while maintaining backward compatibility with cards made for
	  the older ISA bus.  The EISA bus saw limited use between 1988 and
	  1995 when it was made obsolete by the PCI bus.

	  Say Y here if you are building a kernel for an EISA-based machine.

	  Otherwise, say N.

source "drivers/eisa/Kconfig"

config MCA
2012
	bool "MCA support"
I
Ingo Molnar 已提交
2013
	---help---
2014 2015 2016 2017 2018 2019 2020 2021 2022
	  MicroChannel Architecture is found in some IBM PS/2 machines and
	  laptops.  It is a bus system similar to PCI or ISA. See
	  <file:Documentation/mca.txt> (and especially the web page given
	  there) before attempting to build an MCA bus kernel.

source "drivers/mca/Kconfig"

config SCx200
	tristate "NatSemi SCx200 support"
I
Ingo Molnar 已提交
2023
	---help---
2024 2025 2026 2027 2028 2029 2030 2031 2032
	  This provides basic support for National Semiconductor's
	  (now AMD's) Geode processors.  The driver probes for the
	  PCI-IDs of several on-chip devices, so its a good dependency
	  for other scx200_* drivers.

	  If compiled as a module, the driver is named scx200.

config SCx200HR_TIMER
	tristate "NatSemi SCx200 27MHz High-Resolution Timer Support"
J
John Stultz 已提交
2033
	depends on SCx200
2034
	default y
I
Ingo Molnar 已提交
2035
	---help---
2036 2037 2038 2039 2040 2041
	  This driver provides a clocksource built upon the on-chip
	  27MHz high-resolution timer.  Its also a workaround for
	  NSC Geode SC-1100's buggy TSC, which loses time when the
	  processor goes idle (as is done by the scheduler).  The
	  other workaround is idle=poll boot option.

2042 2043
config OLPC
	bool "One Laptop Per Child support"
2044
	depends on !X86_PAE
2045
	select GPIOLIB
2046
	select OF
2047
	select OF_PROMTREE
I
Ingo Molnar 已提交
2048
	---help---
2049 2050 2051
	  Add support for detecting the unique features of the OLPC
	  XO hardware.

2052 2053
config OLPC_XO1_PM
	bool "OLPC XO-1 Power Management"
2054
	depends on OLPC && MFD_CS5535 && PM_SLEEP
2055
	select MFD_CORE
2056
	---help---
2057
	  Add support for poweroff and suspend of the OLPC XO-1 laptop.
2058

D
Daniel Drake 已提交
2059 2060 2061 2062 2063 2064 2065
config OLPC_XO1_RTC
	bool "OLPC XO-1 Real Time Clock"
	depends on OLPC_XO1_PM && RTC_DRV_CMOS
	---help---
	  Add support for the XO-1 real time clock, which can be used as a
	  programmable wakeup source.

2066 2067
config OLPC_XO1_SCI
	bool "OLPC XO-1 SCI extras"
2068 2069
	depends on OLPC && OLPC_XO1_PM
	select POWER_SUPPLY
2070 2071 2072 2073
	select GPIO_CS5535
	select MFD_CORE
	---help---
	  Add support for SCI-based features of the OLPC XO-1 laptop:
2074
	   - EC-driven system wakeups
2075
	   - Power button
2076
	   - Ebook switch
2077
	   - Lid switch
2078 2079
	   - AC adapter status updates
	   - Battery status updates
2080

D
Daniel Drake 已提交
2081 2082
config OLPC_XO15_SCI
	bool "OLPC XO-1.5 SCI extras"
2083 2084
	depends on OLPC && ACPI
	select POWER_SUPPLY
D
Daniel Drake 已提交
2085 2086 2087 2088 2089
	---help---
	  Add support for SCI-based features of the OLPC XO-1.5 laptop:
	   - EC-driven system wakeups
	   - AC adapter status updates
	   - Battery status updates
2090

2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104
config ALIX
	bool "PCEngines ALIX System Support (LED setup)"
	select GPIOLIB
	---help---
	  This option enables system support for the PCEngines ALIX.
	  At present this just sets up LEDs for GPIO control on
	  ALIX2/3/6 boards.  However, other system specific setup should
	  get added here.

	  Note: You must still enable the drivers for GPIO and LED support
	  (GPIO_CS5535 & LEDS_GPIO) to actually use the LEDs

	  Note: You have to set alix.force=1 for boards with Award BIOS.

2105 2106
endif # X86_32

2107
config AMD_NB
2108
	def_bool y
2109
	depends on CPU_SUP_AMD && PCI
2110 2111 2112 2113 2114

source "drivers/pcmcia/Kconfig"

source "drivers/pci/hotplug/Kconfig"

2115 2116 2117 2118 2119 2120 2121 2122 2123 2124
config RAPIDIO
	bool "RapidIO support"
	depends on PCI
	default n
	help
	  If you say Y here, the kernel will include drivers and
	  infrastructure code to support RapidIO interconnect devices.

source "drivers/rapidio/Kconfig"

2125 2126 2127 2128 2129 2130 2131 2132 2133 2134
endmenu


menu "Executable file formats / Emulations"

source "fs/Kconfig.binfmt"

config IA32_EMULATION
	bool "IA32 Emulation"
	depends on X86_64
R
Roland McGrath 已提交
2135
	select COMPAT_BINFMT_ELF
I
Ingo Molnar 已提交
2136
	---help---
2137 2138 2139 2140 2141
	  Include code to run 32-bit programs under a 64-bit kernel. You should
	  likely turn this on, unless you're 100% sure that you don't have any
	  32-bit programs left.

config IA32_AOUT
I
Ingo Molnar 已提交
2142 2143 2144 2145
	tristate "IA32 a.out support"
	depends on IA32_EMULATION
	---help---
	  Support old a.out binaries in the 32bit emulation.
2146 2147

config COMPAT
2148
	def_bool y
2149 2150 2151 2152 2153 2154 2155
	depends on IA32_EMULATION

config COMPAT_FOR_U64_ALIGNMENT
	def_bool COMPAT
	depends on X86_64

config SYSVIPC_COMPAT
2156
	def_bool y
2157
	depends on COMPAT && SYSVIPC
2158

2159 2160 2161 2162 2163
config KEYS_COMPAT
	bool
	depends on COMPAT && KEYS
	default y

2164 2165 2166
endmenu


K
Keith Packard 已提交
2167 2168 2169 2170
config HAVE_ATOMIC_IOMAP
	def_bool y
	depends on X86_32

2171 2172 2173 2174
config HAVE_TEXT_POKE_SMP
	bool
	select STOP_MACHINE if SMP

2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188
source "net/Kconfig"

source "drivers/Kconfig"

source "drivers/firmware/Kconfig"

source "fs/Kconfig"

source "arch/x86/Kconfig.debug"

source "security/Kconfig"

source "crypto/Kconfig"

2189 2190
source "arch/x86/kvm/Kconfig"

2191
source "lib/Kconfig"