Kconfig 56.8 KB
Newer Older
1
# x86 configuration
S
Sam Ravnborg 已提交
2 3 4 5
mainmenu "Linux Kernel Configuration for x86"

# Select 32 or 64 bit
config 64BIT
6 7
	bool "64-bit kernel" if ARCH = "x86"
	default ARCH = "x86_64"
S
Sam Ravnborg 已提交
8 9 10 11 12 13 14 15 16
	help
	  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

config X86_64
	def_bool 64BIT
17 18

### Arch settings
19
config X86
20
	def_bool y
21
	select HAVE_UNSTABLE_SCHED_CLOCK
S
Sam Ravnborg 已提交
22
	select HAVE_IDE
M
Mathieu Desnoyers 已提交
23
	select HAVE_OPROFILE
M
Mathieu Desnoyers 已提交
24
	select HAVE_KPROBES
25
	select HAVE_KRETPROBES
26
	select HAVE_KVM if ((X86_32 && !X86_VOYAGER && !X86_VISWS && !X86_NUMAQ) || X86_64)
I
Ingo Molnar 已提交
27
	select HAVE_ARCH_KGDB if !X86_VOYAGER
28

29
config ARCH_DEFCONFIG
30
	string
31 32
	default "arch/x86/configs/i386_defconfig" if X86_32
	default "arch/x86/configs/x86_64_defconfig" if X86_64
33

34

N
Nick Piggin 已提交
35
config GENERIC_LOCKBREAK
N
Nick Piggin 已提交
36
	def_bool n
N
Nick Piggin 已提交
37

38
config GENERIC_TIME
39
	def_bool y
40 41

config GENERIC_CMOS_UPDATE
42
	def_bool y
43 44

config CLOCKSOURCE_WATCHDOG
45
	def_bool y
46 47

config GENERIC_CLOCKEVENTS
48
	def_bool y
49 50

config GENERIC_CLOCKEVENTS_BROADCAST
51
	def_bool y
52 53 54
	depends on X86_64 || (X86_32 && X86_LOCAL_APIC)

config LOCKDEP_SUPPORT
55
	def_bool y
56 57

config STACKTRACE_SUPPORT
58
	def_bool y
59

60 61 62
config HAVE_LATENCYTOP_SUPPORT
	def_bool y

63 64 65 66
config FAST_CMPXCHG_LOCAL
	bool
	default y

67
config MMU
68
	def_bool y
69 70

config ZONE_DMA
71
	def_bool y
72 73 74 75 76

config SBUS
	bool

config GENERIC_ISA_DMA
77
	def_bool y
78 79

config GENERIC_IOMAP
80
	def_bool y
81 82

config GENERIC_BUG
83
	def_bool y
84 85 86
	depends on BUG

config GENERIC_HWEIGHT
87
	def_bool y
88

89 90 91
config GENERIC_GPIO
	def_bool n

92
config ARCH_MAY_HAVE_PC_FDC
93
	def_bool y
94

95 96 97 98 99 100 101 102 103 104 105 106
config RWSEM_GENERIC_SPINLOCK
	def_bool !X86_XADD

config RWSEM_XCHGADD_ALGORITHM
	def_bool X86_XADD

config ARCH_HAS_ILOG2_U32
	def_bool n

config ARCH_HAS_ILOG2_U64
	def_bool n

V
Venki Pallipadi 已提交
107 108 109
config ARCH_HAS_CPU_IDLE_WAIT
	def_bool y

110 111 112
config GENERIC_CALIBRATE_DELAY
	def_bool y

113 114 115 116
config GENERIC_TIME_VSYSCALL
	bool
	default X86_64

117 118 119
config ARCH_HAS_CPU_RELAX
	def_bool y

120 121 122
config ARCH_HAS_CACHE_LINE_SIZE
	def_bool y

123
config HAVE_SETUP_PER_CPU_AREA
124
	def_bool X86_64_SMP || (X86_SMP && !X86_VOYAGER)
125

126 127 128
config HAVE_CPUMASK_OF_CPU_MAP
	def_bool X86_64_SMP

129 130 131 132
config ARCH_HIBERNATION_POSSIBLE
	def_bool y
	depends on !SMP || !X86_VOYAGER

J
Johannes Berg 已提交
133 134 135 136
config ARCH_SUSPEND_POSSIBLE
	def_bool y
	depends on !X86_VOYAGER

137 138 139 140 141 142 143 144 145 146 147
config ZONE_DMA32
	bool
	default X86_64

config ARCH_POPULATES_NODE_MAP
	def_bool y

config AUDIT_ARCH
	bool
	default X86_64

148 149 150
config ARCH_SUPPORTS_AOUT
	def_bool y

151 152 153
config ARCH_SUPPORTS_OPTIMIZED_INLINING
	def_bool y

154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169
# Use the generic interrupt handling code in kernel/irq/:
config GENERIC_HARDIRQS
	bool
	default y

config GENERIC_IRQ_PROBE
	bool
	default y

config GENERIC_PENDING_IRQ
	bool
	depends on GENERIC_HARDIRQS && SMP
	default y

config X86_SMP
	bool
170
	depends on SMP && ((X86_32 && !X86_VOYAGER) || X86_64)
171 172
	default y

173 174 175 176 177 178 179 180
config X86_32_SMP
	def_bool y
	depends on X86_32 && SMP

config X86_64_SMP
	def_bool y
	depends on X86_64 && SMP

181 182
config X86_HT
	bool
183
	depends on SMP
184
	depends on (X86_32 && !(X86_VISWS || X86_VOYAGER)) || X86_64
185 186 187 188
	default y

config X86_BIOS_REBOOT
	bool
I
Ingo Molnar 已提交
189
	depends on !X86_VISWS && !X86_VOYAGER
190 191 192 193
	default y

config X86_TRAMPOLINE
	bool
194
	depends on X86_SMP || (X86_VOYAGER && SMP) || (64BIT && ACPI_SLEEP)
195 196 197 198
	default y

config KTIME_SCALAR
	def_bool X86_32
199
source "init/Kconfig"
200

201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226
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.

A
Adrian Bunk 已提交
227
	  See also <file:Documentation/i386/IO-APIC.txt>,
228 229 230 231 232
	  <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.

233 234 235 236 237 238 239 240
config X86_FIND_SMP_CONFIG
	def_bool y
	depends on X86_MPPARSE || X86_VOYAGER || X86_VISWS

if ACPI
config X86_MPPARSE
	def_bool y
	bool "Enable MPS table"
241
	depends on X86_LOCAL_APIC && !X86_VISWS
242 243 244 245 246 247 248 249
	help
	  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
endif

if !ACPI
config X86_MPPARSE
	def_bool y
250
	depends on X86_LOCAL_APIC && !X86_VISWS
251 252
endif

253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273
choice
	prompt "Subarchitecture Type"
	default X86_PC

config X86_PC
	bool "PC-compatible"
	help
	  Choose this option if your computer is a standard PC or compatible.

config X86_ELAN
	bool "AMD Elan"
	depends on X86_32
	help
	  Select this for an AMD Elan processor.

	  Do not use this option for K6/Athlon/Opteron processors!

	  If unsure, choose "PC-compatible" instead.

config X86_VOYAGER
	bool "Voyager (NCR)"
I
Ingo Molnar 已提交
274
	depends on X86_32 && (SMP || BROKEN) && !PCI
275 276 277 278 279 280 281 282 283 284 285
	help
	  Voyager is an MCA-based 32-way capable SMP architecture proprietary
	  to NCR Corp.  Machine classes 345x/35xx/4100/51xx are Voyager-based.

	  *** WARNING ***

	  If you do not specifically know you have a Voyager based machine,
	  say N here, otherwise the kernel you build will not be bootable.

config X86_VISWS
	bool "SGI 320/540 (Visual Workstation)"
I
Ingo Molnar 已提交
286
	depends on X86_32 && PCI
287 288 289 290 291 292 293 294 295 296
	help
	  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 not run on PCs
	  and vice versa. See <file:Documentation/sgi-visws.txt> for details.

config X86_GENERICARCH
297
       bool "Generic architecture"
298 299
	depends on X86_32
       help
300 301 302 303 304 305 306 307 308
          This option compiles in the NUMAQ, Summit, bigsmp, ES7000, default
	  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.

if X86_GENERICARCH

config X86_NUMAQ
	bool "NUMAQ (IBM/Sequent)"
309
	depends on SMP && X86_32 && PCI && X86_MPPARSE
310 311 312 313 314 315 316 317 318 319 320 321 322 323
	select NUMA
	help
	  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>.

config X86_SUMMIT
	bool "Summit/EXA (IBM x440)"
	depends on X86_32 && SMP
	help
	  This option is needed for IBM systems that use the Summit/EXA chipset.
	  In particular, it is needed for the x440.
324 325 326 327 328 329 330

config X86_ES7000
	bool "Support for Unisys ES7000 IA32 series"
	depends on X86_32 && SMP
	help
	  Support for Unisys ES7000 systems.  Say 'Y' here if this kernel is
	  supposed to run on an IA32-based Unisys ES7000 system.
331 332 333 334 335 336 337 338 339

config X86_BIGSMP
	bool "Support for big SMP systems with more than 8 CPUs"
	depends on X86_32 && SMP
	help
	  This option is needed for the systems that have more than 8 CPUs
	  and if the system is not of any sub-arch type above.

endif
340

341 342 343 344 345 346
config X86_RDC321X
	bool "RDC R-321x SoC"
	depends on X86_32
	select M486
	select X86_REBOOTFIXUPS
	select GENERIC_GPIO
F
Florian Fainelli 已提交
347
	select LEDS_CLASS
348
	select LEDS_GPIO
I
Ingo Molnar 已提交
349
	select NEW_LEDS
350 351 352 353 354
	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.

355 356
config X86_VSMP
	bool "Support for ScaleMP vSMP"
357
	select PARAVIRT
I
Ingo Molnar 已提交
358
	depends on X86_64 && PCI
359
	help
360 361 362 363 364 365 366
	  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.

endchoice

config SCHED_NO_NO_OMIT_FRAME_POINTER
367 368
	def_bool y
	prompt "Single-depth WCHAN output"
369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392
	depends on X86_32
	help
	  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"
	help
	  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

source "arch/x86/xen/Kconfig"

config VMI
	bool "VMI Guest support"
	select PARAVIRT
393
	depends on X86_32
394 395 396 397 398 399 400
	depends on !(X86_VISWS || X86_VOYAGER)
	help
	  VMI provides a paravirtualized interface to the VMware ESX server
	  (it could be used by other hypervisors in theory too, but is not
	  at the moment), by linking the kernel to a GPL-ed ROM module
	  provided by the hypervisor.

401 402 403
config KVM_CLOCK
	bool "KVM paravirtualized clock"
	select PARAVIRT
404
	select PARAVIRT_CLOCK
405 406 407 408 409 410 411 412
	depends on !(X86_VISWS || X86_VOYAGER)
	help
	  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

413 414 415 416 417 418 419 420
config KVM_GUEST
	bool "KVM Guest support"
	select PARAVIRT
	depends on !(X86_VISWS || X86_VOYAGER)
	help
	 This option enables various optimizations for running under the KVM
	 hypervisor.

421 422
source "arch/x86/lguest/Kconfig"

423 424
config PARAVIRT
	bool "Enable paravirtualization code"
425
	depends on !(X86_VISWS || X86_VOYAGER)
426 427 428 429 430 431
	help
	  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.

432 433 434 435
config PARAVIRT_CLOCK
	bool
	default n

436 437
endif

438 439 440 441 442 443 444
config PARAVIRT_DEBUG
       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.

445 446
config MEMTEST
	bool "Memtest"
Y
Yinghai Lu 已提交
447 448 449 450
	depends on X86_64
	default y
	help
	  This option adds a kernel parameter 'memtest', which allows memtest
451 452 453 454 455
	  to be set.
		memtest=0, mean disabled; -- default
		memtest=1, mean do 1 test pattern;
		...
		memtest=4, mean do 4 test patterns.
Y
Yinghai Lu 已提交
456 457
	  If you are unsure how to answer this question, answer Y.

458
config X86_SUMMIT_NUMA
459
	def_bool y
460
	depends on X86_32 && NUMA && X86_GENERICARCH
461 462

config X86_CYCLONE_TIMER
463
	def_bool y
464
	depends on X86_GENERICARCH
465 466

config ES7000_CLUSTERED_APIC
467
	def_bool y
468 469 470 471 472
	depends on SMP && X86_ES7000 && MPENTIUMIII

source "arch/x86/Kconfig.cpu"

config HPET_TIMER
473
	def_bool X86_64
474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491
	prompt "HPET Timer Support" if X86_32
	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.htm>.

         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.

         Choose N to continue using the legacy 8254 timer.

config HPET_EMULATE_RTC
492
	def_bool y
493
	depends on HPET_TIMER && (RTC=y || RTC=m || RTC_DRV_CMOS=m || RTC_DRV_CMOS=y)
494 495 496

# Mark as embedded because too many people got it wrong.
# The code disables itself when not needed.
497 498 499 500 501 502 503 504 505
config DMI
	default y
	bool "Enable DMI scanning" if EMBEDDED
	help
	  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.

506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541
config GART_IOMMU
	bool "GART IOMMU support" if EMBEDDED
	default y
	select SWIOTLB
	select AGP
	depends on X86_64 && PCI
	help
	  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
	help
	  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
542 543
	def_bool y
	prompt "Should Calgary be enabled by default?"
544 545 546 547 548 549 550 551
	depends on CALGARY_IOMMU
	help
	  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.

J
Joerg Roedel 已提交
552 553
config AMD_IOMMU
	bool "AMD IOMMU support"
I
Ingo Molnar 已提交
554
	select SWIOTLB
I
Ingo Molnar 已提交
555
	depends on X86_64 && PCI && ACPI
J
Joerg Roedel 已提交
556
	help
557 558 559 560 561 562 563 564 565
	  With this option you can enable support for AMD IOMMU hardware in
	  your system. An IOMMU is a hardware component which provides
	  remapping of DMA memory accesses from devices. With an AMD IOMMU you
	  can isolate the the DMA memory of different devices and protect the
	  system from misbehaving device drivers or hardware.

	  You can find out if your system has an AMD IOMMU if you look into
	  your BIOS for an option to enable it or if you have an IVRS ACPI
	  table.
J
Joerg Roedel 已提交
566

567 568 569 570 571 572 573 574 575 576
# need this always selected by IOMMU for the VIA workaround
config SWIOTLB
	bool
	help
	  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.

577
config IOMMU_HELPER
578
	def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU)
579 580 581 582 583 584 585
config MAXSMP
	bool "Configure Maximum number of SMP Processors and NUMA Nodes"
	depends on X86_64 && SMP
	default n
	help
	  Configure maximum number of CPUS and NUMA Nodes for this architecture.
	  If unsure, say N.
586

587
if MAXSMP
588
config NR_CPUS
589 590 591 592 593
	int
	default "4096"
endif

if !MAXSMP
594
config NR_CPUS
595 596
	int "Maximum number of CPUs (2-4096)"
	range 2 4096
597 598 599 600 601
	depends on SMP
	default "32" if X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000
	default "8"
	help
	  This allows you to specify the maximum number of CPUs which this
602
	  kernel will support.  The maximum supported value is 4096 and the
603 604 605 606
	  minimum value which makes sense is 2.

	  This is purely to save memory - each supported CPU adds
	  approximately eight kilobytes to the kernel image.
607
endif
608 609 610

config SCHED_SMT
	bool "SMT (Hyperthreading) scheduler support"
611
	depends on X86_HT
612 613 614 615 616 617 618
	help
	  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
619 620
	def_bool y
	prompt "Multi-core scheduler support"
621
	depends on X86_HT
622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654
	help
	  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.

source "kernel/Kconfig.preempt"

config X86_UP_APIC
	bool "Local APIC support on uniprocessors"
	depends on X86_32 && !SMP && !(X86_VISWS || X86_VOYAGER || X86_GENERICARCH)
	help
	  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
	help
	  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
655
	def_bool y
656 657 658
	depends on X86_64 || (X86_32 && (X86_UP_APIC || ((X86_VISWS || SMP) && !X86_VOYAGER) || X86_GENERICARCH))

config X86_IO_APIC
659
	def_bool y
660 661 662
	depends on X86_64 || (X86_32 && (X86_UP_IOAPIC || (SMP && !(X86_VISWS || X86_VOYAGER)) || X86_GENERICARCH))

config X86_VISWS_APIC
663
	def_bool y
664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683
	depends on X86_32 && X86_VISWS

config X86_MCE
	bool "Machine Check Exception"
	depends on !X86_VOYAGER
	---help---
	  Machine Check Exception support allows the processor to notify the
	  kernel if it detects a problem (e.g. overheating, component failure).
	  The action the kernel takes depends on the severity of the problem,
	  ranging from a warning message on the console, to halting the machine.
	  Your processor must be a Pentium or newer to support this - check the
	  flags in /proc/cpuinfo for mce.  Note that some older Pentium systems
	  have a design flaw which leads to false MCE events - hence MCE is
	  disabled on all P5 processors, unless explicitly enabled with "mce"
	  as a boot argument.  Similarly, if MCE is built in and creates a
	  problem on some new non-standard machine, you can boot with "nomce"
	  to disable it.  MCE support simply ignores non-MCE processors like
	  the 386 and 486, so nearly everyone can say Y here.

config X86_MCE_INTEL
684 685
	def_bool y
	prompt "Intel MCE features"
686 687 688 689 690 691
	depends on X86_64 && X86_MCE && X86_LOCAL_APIC
	help
	   Additional support for intel specific MCE features such as
	   the thermal monitor.

config X86_MCE_AMD
692 693
	def_bool y
	prompt "AMD MCE features"
694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765
	depends on X86_64 && X86_MCE && X86_LOCAL_APIC
	help
	   Additional support for AMD specific MCE features such as
	   the DRAM Error Threshold.

config X86_MCE_NONFATAL
	tristate "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4"
	depends on X86_32 && X86_MCE
	help
	  Enabling this feature starts a timer that triggers every 5 seconds which
	  will look at the machine check registers to see if anything happened.
	  Non-fatal problems automatically get corrected (but still logged).
	  Disable this if you don't want to see these messages.
	  Seeing the messages this option prints out may be indicative of dying
	  or out-of-spec (ie, overclocked) hardware.
	  This option only does something on certain CPUs.
	  (AMD Athlon/Duron and Intel Pentium 4)

config X86_MCE_P4THERMAL
	bool "check for P4 thermal throttling interrupt."
	depends on X86_32 && X86_MCE && (X86_UP_APIC || SMP) && !X86_VISWS
	help
	  Enabling this feature will cause a message to be printed when the P4
	  enters thermal throttling.

config VM86
	bool "Enable VM86 support" if EMBEDDED
	default y
	depends on X86_32
	help
          This option is required by programs like DOSEMU to run 16-bit legacy
	  code on X86 processors. It also may be needed by software like
          XFree86 to initialize some video cards via BIOS. Disabling this
          option saves about 6k.

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"
	---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
766 767
	def_bool n
	prompt "Enable X86 board specific fixups for reboot"
768 769 770 771 772 773 774 775 776
	depends on X86_32 && X86
	---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
777
	  CS5530A and CS5536 chipsets and the RDC R-321x SoC.
778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800

	  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
	tristate "/dev/cpu/microcode - Intel IA32 CPU microcode support"
	select FW_LOADER
	---help---
	  If you say Y here, you will be able to update the microcode on
	  Intel processors in the IA32 family, e.g. Pentium Pro, Pentium II,
	  Pentium III, Pentium 4, Xeon etc.  You will obviously need the
	  actual microcode binary data itself which is not shipped with the
	  Linux kernel.

	  For latest news and information on obtaining all the required
	  ingredients for this driver, check:
	  <http://www.urbanmyth.org/microcode/>.

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

config MICROCODE_OLD_INTERFACE
801
	def_bool y
802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925
	depends on MICROCODE

config X86_MSR
	tristate "/dev/cpu/*/msr - Model-specific register support"
	help
	  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"
	help
	  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 HIGHMEM4G if !X86_NUMAQ
	default HIGHMEM64G if X86_NUMAQ
	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
	help
	  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
	help
	  Select this if you have a 32-bit processor and more than 4
	  gigabytes of physical RAM.

endchoice

choice
	depends on EXPERIMENTAL
	prompt "Memory split" if EMBEDDED
	default VMSPLIT_3G
	depends on X86_32
	help
	  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
926
	def_bool y
927 928 929
	depends on X86_32 && (HIGHMEM64G || HIGHMEM4G)

config X86_PAE
930 931
	def_bool n
	prompt "PAE (Physical Address Extension) Support"
932 933 934 935 936 937 938 939 940 941 942 943
	depends on X86_32 && !HIGHMEM4G
	select RESOURCES_64BIT
	help
	  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.

# Common NUMA Features
config NUMA
	bool "Numa Memory Allocation and Scheduler Support (EXPERIMENTAL)"
	depends on SMP
944
	depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_BIGSMP || X86_SUMMIT && ACPI) && EXPERIMENTAL)
945
	default n if X86_PC
946
	default y if (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP)
947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962
	help
	  Enable NUMA (Non Uniform Memory Access) support.
	  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.

	  For i386 this is currently highly experimental and should be only
	  used for kernel development. It might also cause boot failures.
	  For x86_64 this is recommended on all multiprocessor Opteron systems.
	  If the system is EM64T, you should say N unless your system is
	  EM64T NUMA.

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

config K8_NUMA
963 964 965 966
	def_bool y
	prompt "Old style AMD Opteron NUMA detection"
	depends on X86_64 && NUMA && PCI
	help
967 968 969 970 971 972 973
	 Enable K8 NUMA node topology detection.  You should say Y here if
	 you have a multi processor AMD K8 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.

config X86_64_ACPI_NUMA
974 975
	def_bool y
	prompt "ACPI NUMA detection"
976 977 978 979 980
	depends on X86_64 && NUMA && ACPI && PCI
	select ACPI_NUMA
	help
	  Enable ACPI SRAT based node topology detection.

981 982 983 984 985 986 987 988 989
# 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

990 991 992 993 994 995 996 997
config NUMA_EMU
	bool "NUMA emulation"
	depends on X86_64 && NUMA
	help
	  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.

998 999 1000 1001 1002 1003 1004 1005
if MAXSMP

config NODES_SHIFT
	int
	default "9"
endif

if !MAXSMP
1006
config NODES_SHIFT
1007 1008
	int "Maximum NUMA Nodes (as a power of 2)"
	range 1 9   if X86_64
1009 1010 1011 1012
	default "6" if X86_64
	default "4" if X86_NUMAQ
	default "3"
	depends on NEED_MULTIPLE_NODES
1013 1014 1015 1016
	help
	  Specify the maximum number of NUMA Nodes available on the target
	  system.  Increases memory reserved to accomodate various tables.
endif
1017 1018

config HAVE_ARCH_BOOTMEM_NODE
1019
	def_bool y
1020 1021 1022
	depends on X86_32 && NUMA

config ARCH_HAVE_MEMORY_PRESENT
1023
	def_bool y
1024 1025 1026
	depends on X86_32 && DISCONTIGMEM

config NEED_NODE_MEMMAP_SIZE
1027
	def_bool y
1028 1029 1030
	depends on X86_32 && (DISCONTIGMEM || SPARSEMEM)

config HAVE_ARCH_ALLOC_REMAP
1031
	def_bool y
1032 1033 1034 1035
	depends on X86_32 && NUMA

config ARCH_FLATMEM_ENABLE
	def_bool y
1036
	depends on X86_32 && ARCH_SELECT_MEMORY_MODEL && X86_PC && !NUMA
1037 1038 1039

config ARCH_DISCONTIGMEM_ENABLE
	def_bool y
1040
	depends on NUMA && X86_32
1041 1042 1043

config ARCH_DISCONTIGMEM_DEFAULT
	def_bool y
1044 1045 1046 1047 1048
	depends on NUMA && X86_32

config ARCH_SPARSEMEM_DEFAULT
	def_bool y
	depends on X86_64
1049 1050 1051

config ARCH_SPARSEMEM_ENABLE
	def_bool y
1052
	depends on X86_64 || NUMA || (EXPERIMENTAL && X86_PC)
1053 1054 1055 1056 1057
	select SPARSEMEM_STATIC if X86_32
	select SPARSEMEM_VMEMMAP_ENABLE if X86_64

config ARCH_SELECT_MEMORY_MODEL
	def_bool y
1058
	depends on ARCH_SPARSEMEM_ENABLE
1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 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 1134

config ARCH_MEMORY_PROBE
	def_bool X86_64
	depends on MEMORY_HOTPLUG

source "mm/Kconfig"

config HIGHPTE
	bool "Allocate 3rd-level pagetables from highmem"
	depends on X86_32 && (HIGHMEM4G || HIGHMEM64G)
	help
	  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.

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
	bool "MTRR (Memory Type Range Register) support"
	---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.

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

1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152
config MTRR_SANITIZER
	def_bool y
	prompt "MTRR cleanup support"
	depends on MTRR
	help
	  Convert MTRR layout from continuous to discrete, so some X driver
	  could add WB entries.

	  Say N here if you see bootup problems (boot crash, boot hang,
	  spontaneous reboots).

	  Could be disabled with disable_mtrr_cleanup. Also mtrr_chunk_size
	  could be used to send largest mtrr entry size for continuous block
	  to hold holes (aka. UC entries)

	  If unsure, say Y.

config MTRR_SANITIZER_ENABLE_DEFAULT
1153 1154 1155
	int "MTRR cleanup enable value (0-1)"
	range 0 1
	default "0"
1156 1157
	depends on MTRR_SANITIZER
	help
1158
	  Enable mtrr cleanup default value
1159

1160 1161 1162 1163 1164 1165 1166 1167 1168
config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT
	int "MTRR cleanup spare reg num (0-7)"
	range 0 7
	default "1"
	depends on MTRR_SANITIZER
	help
	  mtrr cleanup spare entries default, it can be changed via
	  mtrr_spare_reg_nr=

1169
config X86_PAT
1170
	bool
1171
	prompt "x86 PAT support"
1172
	depends on MTRR
1173 1174
	help
	  Use PAT attributes to setup page level cache control.
1175

1176 1177 1178 1179
	  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,
1180
	  spontaneous reboots) or a non-working video driver.
1181 1182 1183

	  If unsure, say Y.

1184
config EFI
1185
	def_bool n
1186
	prompt "EFI runtime service support"
H
Huang, Ying 已提交
1187
	depends on ACPI
1188
	---help---
1189
	This enables the kernel to use EFI runtime services that are
1190 1191
	available (such as the EFI variable services).

1192 1193 1194 1195 1196 1197
	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.
1198 1199

config IRQBALANCE
1200 1201
	def_bool y
	prompt "Enable kernel irq balancing"
1202 1203 1204 1205 1206 1207
	depends on X86_32 && SMP && X86_IO_APIC
	help
	  The default yes will allow the kernel to do irq load balancing.
	  Saying no will keep the kernel from doing irq load balancing.

config SECCOMP
1208 1209
	def_bool y
	prompt "Enable seccomp to safely compute untrusted bytecode"
1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225
	depends on PROC_FS
	help
	  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
	  enabled via /proc/<pid>/seccomp, it cannot be disabled
	  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)"
1226
	depends on X86_64 && EXPERIMENTAL && BROKEN
1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251
	help
         This option turns on the -fstack-protector GCC feature. This
	  feature puts, at the beginning of critical functions, a canary
	  value on the stack just before the return address, and validates
	  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
	  detected and for those versions, this configuration option is ignored.

config CC_STACKPROTECTOR_ALL
	bool "Use stack-protector for all functions"
	depends on CC_STACKPROTECTOR
	help
	  Normally, GCC only inserts the canary value protection for
	  functions that use large-ish on-stack buffers. By enabling
	  this option, GCC will be asked to do this for ALL functions.

source kernel/Kconfig.hz

config KEXEC
	bool "kexec system call"
I
Ingo Molnar 已提交
1252
	depends on X86_BIOS_REBOOT
1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376
	help
	  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
	bool "kernel crash dumps (EXPERIMENTAL)"
	depends on X86_64 || (X86_32 && HIGHMEM)
	help
	  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

config PHYSICAL_START
	hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
	default "0x1000000" if X86_NUMAQ
	default "0x200000" if X86_64
	default "0x100000"
	help
	  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.

	  So if you are using bzImage for capturing the crash dump, leave
	  the value here unchanged to 0x100000 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 (Typically 16MB
	  0x1000000). 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. Typically this parameter is set as
	  crashkernel=64M@16M. Please take a look at
	  Documentation/kdump/kdump.txt for more details about crash dumps.

	  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
	bool "Build a relocatable kernel (EXPERIMENTAL)"
	depends on EXPERIMENTAL
	help
	  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.

config PHYSICAL_ALIGN
	hex
	prompt "Alignment value to which kernel should be aligned" if X86_32
	default "0x100000" if X86_32
	default "0x200000" if X86_64
	range 0x2000 0x400000
	help
	  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
	bool "Support for suspend on SMP and hot-pluggable CPUs (EXPERIMENTAL)"
	depends on SMP && HOTPLUG && EXPERIMENTAL && !X86_VOYAGER
	---help---
	  Say Y here to experiment with turning CPUs off and on, and to
	  enable suspend on SMP systems. CPUs can be controlled through
	  /sys/devices/system/cpu.
	  Say N if you want to disable CPU hotplug and don't need to
	  suspend.

config COMPAT_VDSO
1377 1378
	def_bool y
	prompt "Compat VDSO support"
R
Roland McGrath 已提交
1379
	depends on X86_32 || IA32_EMULATION
1380
	help
R
Roland McGrath 已提交
1381
	  Map the 32-bit VDSO to the predictable old-style address too.
1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398
	---help---
	  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.

endmenu

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

config HAVE_ARCH_EARLY_PFN_TO_NID
	def_bool X86_64
	depends on NUMA

1399 1400 1401 1402
menu "Power management options"
	depends on !X86_VOYAGER

config ARCH_HIBERNATION_HEADER
1403
	def_bool y
1404 1405 1406 1407 1408 1409
	depends on X86_64 && HIBERNATION

source "kernel/power/Kconfig"

source "drivers/acpi/Kconfig"

1410 1411 1412 1413 1414
config X86_APM_BOOT
	bool
	default y
	depends on APM || APM_MODULE

1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432
menuconfig APM
	tristate "APM (Advanced Power Management) BIOS support"
	depends on X86_32 && PM_SLEEP && !X86_VISWS
	---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
1433
	  and more information, read <file:Documentation/power/pm.txt> and the
1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552
	  Battery Powered Linux mini-HOWTO, available from
	  <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"
	help
	  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"
	help
	  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"
	help
	  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"
	help
	  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.

config APM_REAL_MODE_POWER_OFF
	bool "Use real mode APM BIOS call to power off"
	help
	  Use real mode APM BIOS calls to switch off the computer. This is
	  a work-around for a number of buggy BIOSes. Switch this option on if
	  your computer crashes instead of powering off properly.

endif # APM

source "arch/x86/kernel/cpu/cpufreq/Kconfig"

source "drivers/cpuidle/Kconfig"

endmenu


menu "Bus options (PCI etc.)"

config PCI
I
Ingo Molnar 已提交
1553
	bool "PCI support"
A
Adrian Bunk 已提交
1554
	default y
1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589
	select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
	help
	  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"
	depends on X86_32 && PCI && !X86_VISWS
	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"

1590 1591 1592 1593
config PCI_GOOLPC
	bool "OLPC"
	depends on OLPC

1594 1595 1596
config PCI_GOANY
	bool "Any"

1597 1598 1599
endchoice

config PCI_BIOS
1600
	def_bool y
1601 1602 1603 1604
	depends on X86_32 && !X86_VISWS && PCI && (PCI_GOBIOS || PCI_GOANY)

# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
config PCI_DIRECT
1605
	def_bool y
1606
	depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC) || X86_VISWS)
1607 1608

config PCI_MMCONFIG
1609
	def_bool y
1610 1611
	depends on X86_32 && PCI && ACPI && (PCI_GOMMCONFIG || PCI_GOANY)

1612
config PCI_OLPC
1613 1614
	def_bool y
	depends on PCI && OLPC && (PCI_GOOLPC || PCI_GOANY)
1615

1616
config PCI_DOMAINS
1617
	def_bool y
1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634
	depends on PCI

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

config DMAR
	bool "Support for DMA Remapping Devices (EXPERIMENTAL)"
	depends on X86_64 && PCI_MSI && ACPI && EXPERIMENTAL
	help
	  DMA remapping (DMAR) devices support enables independent address
	  translations for Direct Memory Access (DMA) from devices.
	  These DMA remapping devices are reported via ACPI tables
	  and include PCI device scope covered by these DMA
	  remapping devices.

config DMAR_GFX_WA
1635 1636
	def_bool y
	prompt "Support for Graphics workaround"
1637 1638 1639 1640 1641 1642 1643 1644 1645
	depends on DMAR
	help
	 Current Graphics drivers tend to use physical address
	 for DMA and avoid using DMA APIs. Setting this config
	 option permits the IOMMU driver to set a unity map for
	 all the OS-visible memory. Hence the driver can continue
	 to use physical addresses for DMA.

config DMAR_FLOPPY_WA
1646
	def_bool y
1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659
	depends on DMAR
	help
	 Floppy disk drivers are know to bypass DMA API calls
	 thereby failing to work when IOMMU is enabled. This
	 workaround will setup a 1:1 mapping for the first
	 16M to make floppy (an ISA device) work.

source "drivers/pci/pcie/Kconfig"

source "drivers/pci/Kconfig"

# x86_64 have no ISA slots, but do have ISA-style DMA.
config ISA_DMA_API
1660
	def_bool y
1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725

if X86_32

config ISA
	bool "ISA support"
	depends on !(X86_VOYAGER || X86_VISWS)
	help
	  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
	bool "MCA support" if !(X86_VISWS || X86_VOYAGER)
	default y if X86_VOYAGER
	help
	  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"
	depends on !X86_VOYAGER
	help
	  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"
	depends on SCx200 && GENERIC_TIME
	default y
	help
	  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.

config GEODE_MFGPT_TIMER
1726 1727
	def_bool y
	prompt "Geode Multi-Function General Purpose Timer (MFGPT) events"
1728 1729 1730 1731 1732 1733 1734
	depends on MGEODE_LX && GENERIC_TIME && GENERIC_CLOCKEVENTS
	help
	  This driver provides a clock event source based on the MFGPT
	  timer(s) in the CS5535 and CS5536 companion chip for the geode.
	  MFGPTs have a better resolution and max interval than the
	  generic PIT, and are suitable for use as high-res timers.

1735 1736 1737 1738 1739 1740 1741
config OLPC
	bool "One Laptop Per Child support"
	default n
	help
	  Add support for detecting the unique features of the OLPC
	  XO hardware.

1742 1743
endif # X86_32

1744 1745
config K8_NB
	def_bool y
1746
	depends on AGP_AMD64 || (X86_64 && (GART_IOMMU || (PCI && NUMA)))
1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761

source "drivers/pcmcia/Kconfig"

source "drivers/pci/hotplug/Kconfig"

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
1762
	select COMPAT_BINFMT_ELF
1763 1764 1765 1766 1767 1768 1769
	help
	  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
       tristate "IA32 a.out support"
1770
       depends on IA32_EMULATION && ARCH_SUPPORTS_AOUT
1771 1772 1773 1774
       help
         Support old a.out binaries in the 32bit emulation.

config COMPAT
1775
	def_bool y
1776 1777 1778 1779 1780 1781 1782
	depends on IA32_EMULATION

config COMPAT_FOR_U64_ALIGNMENT
	def_bool COMPAT
	depends on X86_64

config SYSVIPC_COMPAT
1783
	def_bool y
1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802
	depends on X86_64 && COMPAT && SYSVIPC

endmenu


source "net/Kconfig"

source "drivers/Kconfig"

source "drivers/firmware/Kconfig"

source "fs/Kconfig"

source "arch/x86/Kconfig.debug"

source "security/Kconfig"

source "crypto/Kconfig"

1803 1804
source "arch/x86/kvm/Kconfig"

1805
source "lib/Kconfig"