arch/i386/Kconfig

   1 #
   2 # For a description of the syntax of this configuration file,
   3 # see Documentation/kbuild/kconfig-language.txt.
   4 #
   5
   6 mainmenu "Linux Kernel Configuration"
   7
   8 config X86
   9         bool
  10         default y
  11         help
  12           This is Linux's home port.  Linux was originally native to the Intel
  13           386, and runs on all the later x86 processors including the Intel
  14           486, 586, Pentiums, and various instruction-set-compatible chips by
  15           AMD, Cyrix, and others.
  16
  17 config MMU
  18         bool
  19         default y
  20
  21 config SBUS
  22         bool
  23
  24 config UID16
  25         bool
  26         default y
  27
  28 config GENERIC_ISA_DMA
  29         bool
  30         default y
  31
  32 config GENERIC_IOMAP
  33         bool
  34         default y
  35
  36 source "init/Kconfig"
  37
  38 menu "Processor type and features"
  39
  40 choice
  41         prompt "Subarchitecture Type"
  42         default X86_PC
  43
  44 config X86_PC
  45         bool "PC-compatible"
  46         help
  47           Choose this option if your computer is a standard PC or compatible.
  48
  49 config X86_ELAN
  50         bool "AMD Elan"
  51         help
  52           Select this for an AMD Elan processor.
  53
  54           Do not use this option for K6/Athlon/Opteron processors!
  55
  56           If unsure, choose "PC-compatible" instead.
  57
  58 config X86_VOYAGER
  59         bool "Voyager (NCR)"
  60         help
  61           Voyager is an MCA-based 32-way capable SMP architecture proprietary
  62           to NCR Corp.  Machine classes 345x/35xx/4100/51xx are Voyager-based.
  63
  64           *** WARNING ***
  65
  66           If you do not specifically know you have a Voyager based machine,
  67           say N here, otherwise the kernel you build will not be bootable.
  68
  69 config X86_NUMAQ
  70         bool "NUMAQ (IBM/Sequent)"
  71         select NUMA
  72         help
  73           This option is used for getting Linux to run on a (IBM/Sequent) NUMA
  74           multiquad box. This changes the way that processors are bootstrapped,
  75           and uses Clustered Logical APIC addressing mode instead of Flat Logical.
  76           You will need a new lynxer.elf file to flash your firmware with - send
  77           email to <Martin.Bligh@us.ibm.com>.
  78
  79 config X86_SUMMIT
  80         bool "Summit/EXA (IBM x440)"
  81         depends on SMP
  82         help
  83           This option is needed for IBM systems that use the Summit/EXA chipset.
  84           In particular, it is needed for the x440.
  85
  86           If you don't have one of these computers, you should say N here.
  87
  88 config X86_BIGSMP
  89         bool "Support for other sub-arch SMP systems with more than 8 CPUs"
  90         depends on SMP
  91         help
  92           This option is needed for the systems that have more than 8 CPUs
  93           and if the system is not of any sub-arch type above.
  94
  95           If you don't have such a system, you should say N here.
  96
  97 config X86_VISWS
  98         bool "SGI 320/540 (Visual Workstation)"
  99         help
 100           The SGI Visual Workstation series is an IA32-based workstation
 101           based on SGI systems chips with some legacy PC hardware attached.
 102
 103           Say Y here to create a kernel to run on the SGI 320 or 540.
 104
 105           A kernel compiled for the Visual Workstation will not run on PCs
 106           and vice versa. See <file:Documentation/sgi-visws.txt> for details.
 107
 108 config X86_GENERICARCH
 109        bool "Generic architecture (Summit, bigsmp, ES7000, default)"
 110        depends on SMP
 111        help
 112           This option compiles in the Summit, bigsmp, ES7000, default subarchitectures.
 113           It is intended for a generic binary kernel.
 114
 115 config X86_ES7000
 116         bool "Support for Unisys ES7000 IA32 series"
 117         depends on SMP
 118         help
 119           Support for Unisys ES7000 systems.  Say 'Y' here if this kernel is
 120           supposed to run on an IA32-based Unisys ES7000 system.
 121           Only choose this option if you have such a system, otherwise you
 122           should say N here.
 123
 124 endchoice
 125
 126 config ACPI_SRAT
 127         bool
 128         default y
 129         depends on NUMA && (X86_SUMMIT || X86_GENERICARCH)
 130
 131 config X86_SUMMIT_NUMA
 132         bool
 133         default y
 134         depends on NUMA && (X86_SUMMIT || X86_GENERICARCH)
 135
 136 config X86_CYCLONE_TIMER
 137         bool
 138         default y
 139         depends on X86_SUMMIT || X86_GENERICARCH
 140
 141 config ES7000_CLUSTERED_APIC
 142         bool
 143         default y
 144         depends on SMP && X86_ES7000 && MPENTIUMIII
 145
 146 if !X86_ELAN
 147
 148 choice
 149         prompt "Processor family"
 150         default M686
 151
 152 config M386
 153         bool "386"
 154         ---help---
 155           This is the processor type of your CPU. This information is used for
 156           optimizing purposes. In order to compile a kernel that can run on
 157           all x86 CPU types (albeit not optimally fast), you can specify
 158           "386" here.
 159
 160           The kernel will not necessarily run on earlier architectures than
 161           the one you have chosen, e.g. a Pentium optimized kernel will run on
 162           a PPro, but not necessarily on a i486.
 163
 164           Here are the settings recommended for greatest speed:
 165           - "386" for the AMD/Cyrix/Intel 386DX/DXL/SL/SLC/SX, Cyrix/TI
 166           486DLC/DLC2, UMC 486SX-S and NexGen Nx586.  Only "386" kernels
 167           will run on a 386 class machine.
 168           - "486" for the AMD/Cyrix/IBM/Intel 486DX/DX2/DX4 or
 169           SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or U5S.
 170           - "586" for generic Pentium CPUs lacking the TSC
 171           (time stamp counter) register.
 172           - "Pentium-Classic" for the Intel Pentium.
 173           - "Pentium-MMX" for the Intel Pentium MMX.
 174           - "Pentium-Pro" for the Intel Pentium Pro.
 175           - "Pentium-II" for the Intel Pentium II or pre-Coppermine Celeron.
 176           - "Pentium-III" for the Intel Pentium III or Coppermine Celeron.
 177           - "Pentium-4" for the Intel Pentium 4 or P4-based Celeron.
 178           - "K6" for the AMD K6, K6-II and K6-III (aka K6-3D).
 179           - "Athlon" for the AMD K7 family (Athlon/Duron/Thunderbird).
 180           - "Crusoe" for the Transmeta Crusoe series.
 181           - "Efficeon" for the Transmeta Efficeon series.
 182           - "Winchip-C6" for original IDT Winchip.
 183           - "Winchip-2" for IDT Winchip 2.
 184           - "Winchip-2A" for IDT Winchips with 3dNow! capabilities.
 185           - "GeodeGX1" for Geode GX1 (Cyrix MediaGX).
 186           - "CyrixIII/VIA C3" for VIA Cyrix III or VIA C3.
 187           - "VIA C3-2 for VIA C3-2 "Nehemiah" (model 9 and above).
 188
 189           If you don't know what to do, choose "386".
 190
 191 config M486
 192         bool "486"
 193         help
 194           Select this for a 486 series processor, either Intel or one of the
 195           compatible processors from AMD, Cyrix, IBM, or Intel.  Includes DX,
 196           DX2, and DX4 variants; also SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or
 197           U5S.
 198
 199 config M586
 200         bool "586/K5/5x86/6x86/6x86MX"
 201         help
 202           Select this for an 586 or 686 series processor such as the AMD K5,
 203           the Cyrix 5x86, 6x86 and 6x86MX.  This choice does not
 204           assume the RDTSC (Read Time Stamp Counter) instruction.
 205
 206 config M586TSC
 207         bool "Pentium-Classic"
 208         help
 209           Select this for a Pentium Classic processor with the RDTSC (Read
 210           Time Stamp Counter) instruction for benchmarking.
 211
 212 config M586MMX
 213         bool "Pentium-MMX"
 214         help
 215           Select this for a Pentium with the MMX graphics/multimedia
 216           extended instructions.
 217
 218 config M686
 219         bool "Pentium-Pro"
 220         help
 221           Select this for Intel Pentium Pro chips.  This enables the use of
 222           Pentium Pro extended instructions, and disables the init-time guard
 223           against the f00f bug found in earlier Pentiums.
 224
 225 config MPENTIUMII
 226         bool "Pentium-II/Celeron(pre-Coppermine)"
 227         help
 228           Select this for Intel chips based on the Pentium-II and
 229           pre-Coppermine Celeron core.  This option enables an unaligned
 230           copy optimization, compiles the kernel with optimization flags
 231           tailored for the chip, and applies any applicable Pentium Pro
 232           optimizations.
 233
 234 config MPENTIUMIII
 235         bool "Pentium-III/Celeron(Coppermine)/Pentium-III Xeon"
 236         help
 237           Select this for Intel chips based on the Pentium-III and
 238           Celeron-Coppermine core.  This option enables use of some
 239           extended prefetch instructions in addition to the Pentium II
 240           extensions.
 241
 242 config MPENTIUMM
 243         bool "Pentium M"
 244         help
 245           Select this for Intel Pentium M (not Pentium-4 M)
 246           notebook chips.
 247
 248 config MPENTIUM4
 249         bool "Pentium-4/Celeron(P4-based)/Pentium-4 M/Xeon"
 250         help
 251           Select this for Intel Pentium 4 chips.  This includes the
 252           Pentium 4, P4-based Celeron and Xeon, and Pentium-4 M
 253           (not Pentium M) chips.  This option enables compile flags
 254           optimized for the chip, uses the correct cache shift, and
 255           applies any applicable Pentium III optimizations.
 256
 257 config MK6
 258         bool "K6/K6-II/K6-III"
 259         help
 260           Select this for an AMD K6-family processor.  Enables use of
 261           some extended instructions, and passes appropriate optimization
 262           flags to GCC.
 263
 264 config MK7
 265         bool "Athlon/Duron/K7"
 266         help
 267           Select this for an AMD Athlon K7-family processor.  Enables use of
 268           some extended instructions, and passes appropriate optimization
 269           flags to GCC.
 270
 271 config MK8
 272         bool "Opteron/Athlon64/Hammer/K8"
 273         help
 274           Select this for an AMD Opteron or Athlon64 Hammer-family processor.  Enables
 275           use of some extended instructions, and passes appropriate optimization
 276           flags to GCC.
 277
 278 config MCRUSOE
 279         bool "Crusoe"
 280         help
 281           Select this for a Transmeta Crusoe processor.  Treats the processor
 282           like a 586 with TSC, and sets some GCC optimization flags (like a
 283           Pentium Pro with no alignment requirements).
 284
 285 config MEFFICEON
 286         bool "Efficeon"
 287         help
 288           Select this for a Transmeta Efficeon processor.
 289
 290 config MWINCHIPC6
 291         bool "Winchip-C6"
 292         help
 293           Select this for an IDT Winchip C6 chip.  Linux and GCC
 294           treat this chip as a 586TSC with some extended instructions
 295           and alignment requirements.
 296
 297 config MWINCHIP2
 298         bool "Winchip-2"
 299         help
 300           Select this for an IDT Winchip-2.  Linux and GCC
 301           treat this chip as a 586TSC with some extended instructions
 302           and alignment requirements.
 303
 304 config MWINCHIP3D
 305         bool "Winchip-2A/Winchip-3"
 306         help
 307           Select this for an IDT Winchip-2A or 3.  Linux and GCC
 308           treat this chip as a 586TSC with some extended instructions
 309           and alignment reqirements.  Also enable out of order memory
 310           stores for this CPU, which can increase performance of some
 311           operations.
 312
 313 config MGEODEGX1
 314         bool "GeodeGX1"
 315         help
 316           Select this for a Geode GX1 (Cyrix MediaGX) chip.
 317
 318 config MCYRIXIII
 319         bool "CyrixIII/VIA-C3"
 320         help
 321           Select this for a Cyrix III or C3 chip.  Presently Linux and GCC
 322           treat this chip as a generic 586. Whilst the CPU is 686 class,
 323           it lacks the cmov extension which gcc assumes is present when
 324           generating 686 code.
 325           Note that Nehemiah (Model 9) and above will not boot with this
 326           kernel due to them lacking the 3DNow! instructions used in earlier
 327           incarnations of the CPU.
 328
 329 config MVIAC3_2
 330         bool "VIA C3-2 (Nehemiah)"
 331         help
 332           Select this for a VIA C3 "Nehemiah". Selecting this enables usage
 333           of SSE and tells gcc to treat the CPU as a 686.
 334           Note, this kernel will not boot on older (pre model 9) C3s.
 335
 336 endchoice
 337
 338 config X86_GENERIC
 339        bool "Generic x86 support"
 340        help
 341           Instead of just including optimizations for the selected
 342           x86 variant (e.g. PII, Crusoe or Athlon), include some more
 343           generic optimizations as well. This will make the kernel
 344           perform better on x86 CPUs other than that selected.
 345
 346           This is really intended for distributors who need more
 347           generic optimizations.
 348
 349 endif
 350
 351 #
 352 # Define implied options from the CPU selection here
 353 #
 354 config X86_CMPXCHG
 355         bool
 356         depends on !M386
 357         default y
 358
 359 config X86_XADD
 360         bool
 361         depends on !M386
 362         default y
 363
 364 config X86_L1_CACHE_SHIFT
 365         int
 366         default "7" if MPENTIUM4 || X86_GENERIC
 367         default "4" if X86_ELAN || M486 || M386
 368         default "5" if MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODEGX1
 369         default "6" if MK7 || MK8 || MPENTIUMM
 370
 371 config RWSEM_GENERIC_SPINLOCK
 372         bool
 373         depends on M386
 374         default y
 375
 376 config RWSEM_XCHGADD_ALGORITHM
 377         bool
 378         depends on !M386
 379         default y
 380
 381 config GENERIC_CALIBRATE_DELAY
 382         bool
 383         default y
 384
 385 config X86_PPRO_FENCE
 386         bool
 387         depends on M686 || M586MMX || M586TSC || M586 || M486 || M386 || MGEODEGX1
 388         default y
 389
 390 config X86_F00F_BUG
 391         bool
 392         depends on M586MMX || M586TSC || M586 || M486 || M386
 393         default y
 394
 395 config X86_WP_WORKS_OK
 396         bool
 397         depends on !M386
 398         default y
 399
 400 config X86_INVLPG
 401         bool
 402         depends on !M386
 403         default y
 404
 405 config X86_BSWAP
 406         bool
 407         depends on !M386
 408         default y
 409
 410 config X86_POPAD_OK
 411         bool
 412         depends on !M386
 413         default y
 414
 415 config X86_ALIGNMENT_16
 416         bool
 417         depends on MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCYRIXIII || X86_ELAN || MK6 || M586MMX || M586TSC || M586 || M486 || MVIAC3_2 || MGEODEGX1
 418         default y
 419
 420 config X86_GOOD_APIC
 421         bool
 422         depends on MK7 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || MK8 || MEFFICEON
 423         default y
 424
 425 config X86_INTEL_USERCOPY
 426         bool
 427         depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK7 || MEFFICEON
 428         default y
 429
 430 config X86_USE_PPRO_CHECKSUM
 431         bool
 432         depends on MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MEFFICEON
 433         default y
 434
 435 config X86_USE_3DNOW
 436         bool
 437         depends on MCYRIXIII || MK7
 438         default y
 439
 440 config X86_OOSTORE
 441         bool
 442         depends on (MWINCHIP3D || MWINCHIP2 || MWINCHIPC6) && MTRR
 443         default y
 444
 445 config HPET_TIMER
 446         bool "HPET Timer Support"
 447         help
 448           This enables the use of the HPET for the kernel's internal timer.
 449           HPET is the next generation timer replacing legacy 8254s.
 450           You can safely choose Y here.  However, HPET will only be
 451           activated if the platform and the BIOS support this feature.
 452           Otherwise the 8254 will be used for timing services.
 453
 454           Choose N to continue using the legacy 8254 timer.
 455
 456 config HPET_EMULATE_RTC
 457         bool "Provide RTC interrupt"
 458         depends on HPET_TIMER && RTC=y
 459
 460 config SMP
 461         bool "Symmetric multi-processing support"
 462         ---help---
 463           This enables support for systems with more than one CPU. If you have
 464           a system with only one CPU, like most personal computers, say N. If
 465           you have a system with more than one CPU, say Y.
 466
 467           If you say N here, the kernel will run on single and multiprocessor
 468           machines, but will use only one CPU of a multiprocessor machine. If
 469           you say Y here, the kernel will run on many, but not all,
 470           singleprocessor machines. On a singleprocessor machine, the kernel
 471           will run faster if you say N here.
 472
 473           Note that if you say Y here and choose architecture "586" or
 474           "Pentium" under "Processor family", the kernel will not work on 486
 475           architectures. Similarly, multiprocessor kernels for the "PPro"
 476           architecture may not work on all Pentium based boards.
 477
 478           People using multiprocessor machines who say Y here should also say
 479           Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
 480           Management" code will be disabled if you say Y here.
 481
 482           See also the <file:Documentation/smp.txt>,
 483           <file:Documentation/i386/IO-APIC.txt>,
 484           <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
 485           <http://www.tldp.org/docs.html#howto>.
 486
 487           If you don't know what to do here, say N.
 488
 489 config NR_CPUS
 490         int "Maximum number of CPUs (2-255)"
 491         range 2 255
 492         depends on SMP
 493         default "32" if X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000
 494         default "8"
 495         help
 496           This allows you to specify the maximum number of CPUs which this
 497           kernel will support.  The maximum supported value is 255 and the
 498           minimum value which makes sense is 2.
 499
 500           This is purely to save memory - each supported CPU adds
 501           approximately eight kilobytes to the kernel image.
 502
 503 config SCHED_SMT
 504         bool "SMT (Hyperthreading) scheduler support"
 505         depends on SMP
 506         default off
 507         help
 508           SMT scheduler support improves the CPU scheduler's decision making
 509           when dealing with Intel Pentium 4 chips with HyperThreading at a
 510           cost of slightly increased overhead in some places. If unsure say
 511           N here.
 512
 513 source "kernel/Kconfig.preempt"
 514
 515 config X86_UP_APIC
 516         bool "Local APIC support on uniprocessors"
 517         depends on !SMP && !(X86_VISWS || X86_VOYAGER)
 518         help
 519           A local APIC (Advanced Programmable Interrupt Controller) is an
 520           integrated interrupt controller in the CPU. If you have a single-CPU
 521           system which has a processor with a local APIC, you can say Y here to
 522           enable and use it. If you say Y here even though your machine doesn't
 523           have a local APIC, then the kernel will still run with no slowdown at
 524           all. The local APIC supports CPU-generated self-interrupts (timer,
 525           performance counters), and the NMI watchdog which detects hard
 526           lockups.
 527
 528 config X86_UP_IOAPIC
 529         bool "IO-APIC support on uniprocessors"
 530         depends on X86_UP_APIC
 531         help
 532           An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an
 533           SMP-capable replacement for PC-style interrupt controllers. Most
 534           SMP systems and many recent uniprocessor systems have one.
 535
 536           If you have a single-CPU system with an IO-APIC, you can say Y here
 537           to use it. If you say Y here even though your machine doesn't have
 538           an IO-APIC, then the kernel will still run with no slowdown at all.
 539
 540 config X86_LOCAL_APIC
 541         bool
 542         depends on X86_UP_APIC || ((X86_VISWS || SMP) && !X86_VOYAGER)
 543         default y
 544
 545 config X86_IO_APIC
 546         bool
 547         depends on X86_UP_IOAPIC || (SMP && !(X86_VISWS || X86_VOYAGER))
 548         default y
 549
 550 config X86_VISWS_APIC
 551         bool
 552         depends on X86_VISWS
 553         default y
 554
 555 config X86_TSC
 556         bool
 557         depends on (MWINCHIP3D || MWINCHIP2 || MCRUSOE || MEFFICEON || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || MK8 || MVIAC3_2 || MGEODEGX1) && !X86_NUMAQ
 558         default y
 559
 560 config X86_MCE
 561         bool "Machine Check Exception"
 562         depends on !X86_VOYAGER
 563         ---help---
 564           Machine Check Exception support allows the processor to notify the
 565           kernel if it detects a problem (e.g. overheating, component failure).
 566           The action the kernel takes depends on the severity of the problem,
 567           ranging from a warning message on the console, to halting the machine.
 568           Your processor must be a Pentium or newer to support this - check the
 569           flags in /proc/cpuinfo for mce.  Note that some older Pentium systems
 570           have a design flaw which leads to false MCE events - hence MCE is
 571           disabled on all P5 processors, unless explicitly enabled with "mce"
 572           as a boot argument.  Similarly, if MCE is built in and creates a
 573           problem on some new non-standard machine, you can boot with "nomce"
 574           to disable it.  MCE support simply ignores non-MCE processors like
 575           the 386 and 486, so nearly everyone can say Y here.
 576
 577 config X86_MCE_NONFATAL
 578         tristate "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4"
 579         depends on X86_MCE
 580         help
 581           Enabling this feature starts a timer that triggers every 5 seconds which
 582           will look at the machine check registers to see if anything happened.
 583           Non-fatal problems automatically get corrected (but still logged).
 584           Disable this if you don't want to see these messages.
 585           Seeing the messages this option prints out may be indicative of dying hardware,
 586           or out-of-spec (ie, overclocked) hardware.
 587           This option only does something on certain CPUs.
 588           (AMD Athlon/Duron and Intel Pentium 4)
 589
 590 config X86_MCE_P4THERMAL
 591         bool "check for P4 thermal throttling interrupt."
 592         depends on X86_MCE && (X86_UP_APIC || SMP) && !X86_VISWS
 593         help
 594           Enabling this feature will cause a message to be printed when the P4
 595           enters thermal throttling.
 596
 597 config TOSHIBA
 598         tristate "Toshiba Laptop support"
 599         ---help---
 600           This adds a driver to safely access the System Management Mode of
 601           the CPU on Toshiba portables with a genuine Toshiba BIOS. It does
 602           not work on models with a Phoenix BIOS. The System Management Mode
 603           is used to set the BIOS and power saving options on Toshiba portables.
 604
 605           For information on utilities to make use of this driver see the
 606           Toshiba Linux utilities web site at:
 607           <http://www.buzzard.org.uk/toshiba/>.
 608
 609           Say Y if you intend to run this kernel on a Toshiba portable.
 610           Say N otherwise.
 611
 612 config I8K
 613         tristate "Dell laptop support"
 614         ---help---
 615           This adds a driver to safely access the System Management Mode
 616           of the CPU on the Dell Inspiron 8000. The System Management Mode
 617           is used to read cpu temperature and cooling fan status and to
 618           control the fans on the I8K portables.
 619
 620           This driver has been tested only on the Inspiron 8000 but it may
 621           also work with other Dell laptops. You can force loading on other
 622           models by passing the parameter `force=1' to the module. Use at
 623           your own risk.
 624
 625           For information on utilities to make use of this driver see the
 626           I8K Linux utilities web site at:
 627           <http://people.debian.org/~dz/i8k/>
 628
 629           Say Y if you intend to run this kernel on a Dell Inspiron 8000.
 630           Say N otherwise.
 631
 632 config X86_REBOOTFIXUPS
 633         bool "Enable X86 board specific fixups for reboot"
 634         depends on X86
 635         default n
 636         ---help---
 637           This enables chipset and/or board specific fixups to be done
 638           in order to get reboot to work correctly. This is only needed on
 639           some combinations of hardware and BIOS. The symptom, for which
 640           this config is intended, is when reboot ends with a stalled/hung
 641           system.
 642
 643           Currently, the only fixup is for the Geode GX1/CS5530A/TROM2.1.
 644           combination.
 645
 646           Say Y if you want to enable the fixup. Currently, it's safe to
 647           enable this option even if you don't need it.
 648           Say N otherwise.
 649
 650 config MICROCODE
 651         tristate "/dev/cpu/microcode - Intel IA32 CPU microcode support"
 652         ---help---
 653           If you say Y here and also to "/dev file system support" in the
 654           'File systems' section, you will be able to update the microcode on
 655           Intel processors in the IA32 family, e.g. Pentium Pro, Pentium II,
 656           Pentium III, Pentium 4, Xeon etc.  You will obviously need the
 657           actual microcode binary data itself which is not shipped with the
 658           Linux kernel.
 659
 660           For latest news and information on obtaining all the required
 661           ingredients for this driver, check:
 662           <http://www.urbanmyth.org/microcode/>.
 663
 664           To compile this driver as a module, choose M here: the
 665           module will be called microcode.
 666
 667 config X86_MSR
 668         tristate "/dev/cpu/*/msr - Model-specific register support"
 669         help
 670           This device gives privileged processes access to the x86
 671           Model-Specific Registers (MSRs).  It is a character device with
 672           major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
 673           MSR accesses are directed to a specific CPU on multi-processor
 674           systems.
 675
 676 config X86_CPUID
 677         tristate "/dev/cpu/*/cpuid - CPU information support"
 678         help
 679           This device gives processes access to the x86 CPUID instruction to
 680           be executed on a specific processor.  It is a character device
 681           with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
 682           /dev/cpu/31/cpuid.
 683
 684 source "drivers/firmware/Kconfig"
 685
 686 choice
 687         prompt "High Memory Support"
 688         default NOHIGHMEM
 689
 690 config NOHIGHMEM
 691         bool "off"
 692         ---help---
 693           Linux can use up to 64 Gigabytes of physical memory on x86 systems.
 694           However, the address space of 32-bit x86 processors is only 4
 695           Gigabytes large. That means that, if you have a large amount of
 696           physical memory, not all of it can be "permanently mapped" by the
 697           kernel. The physical memory that's not permanently mapped is called
 698           "high memory".
 699
 700           If you are compiling a kernel which will never run on a machine with
 701           more than 1 Gigabyte total physical RAM, answer "off" here (default
 702           choice and suitable for most users). This will result in a "3GB/1GB"
 703           split: 3GB are mapped so that each process sees a 3GB virtual memory
 704           space and the remaining part of the 4GB virtual memory space is used
 705           by the kernel to permanently map as much physical memory as
 706           possible.
 707
 708           If the machine has between 1 and 4 Gigabytes physical RAM, then
 709           answer "4GB" here.
 710
 711           If more than 4 Gigabytes is used then answer "64GB" here. This
 712           selection turns Intel PAE (Physical Address Extension) mode on.
 713           PAE implements 3-level paging on IA32 processors. PAE is fully
 714           supported by Linux, PAE mode is implemented on all recent Intel
 715           processors (Pentium Pro and better). NOTE: If you say "64GB" here,
 716           then the kernel will not boot on CPUs that don't support PAE!
 717
 718           The actual amount of total physical memory will either be
 719           auto detected or can be forced by using a kernel command line option
 720           such as "mem=256M". (Try "man bootparam" or see the documentation of
 721           your boot loader (lilo or loadlin) about how to pass options to the
 722           kernel at boot time.)
 723
 724           If unsure, say "off".
 725
 726 config HIGHMEM4G
 727         bool "4GB"
 728         help
 729           Select this if you have a 32-bit processor and between 1 and 4
 730           gigabytes of physical RAM.
 731
 732 config HIGHMEM64G
 733         bool "64GB"
 734         help
 735           Select this if you have a 32-bit processor and more than 4
 736           gigabytes of physical RAM.
 737
 738 endchoice
 739
 740 config HIGHMEM
 741         bool
 742         depends on HIGHMEM64G || HIGHMEM4G
 743         default y
 744
 745 config X86_PAE
 746         bool
 747         depends on HIGHMEM64G
 748         default y
 749
 750 # Common NUMA Features
 751 config NUMA
 752         bool "Numa Memory Allocation and Scheduler Support"
 753         depends on SMP && HIGHMEM64G && (X86_NUMAQ || X86_GENERICARCH || (X86_SUMMIT && ACPI))
 754         default n if X86_PC
 755         default y if (X86_NUMAQ || X86_SUMMIT)
 756
 757 # Need comments to help the hapless user trying to turn on NUMA support
 758 comment "NUMA (NUMA-Q) requires SMP, 64GB highmem support"
 759         depends on X86_NUMAQ && (!HIGHMEM64G || !SMP)
 760
 761 comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI"
 762         depends on X86_SUMMIT && (!HIGHMEM64G || !ACPI)
 763
 764 config HAVE_ARCH_BOOTMEM_NODE
 765         bool
 766         depends on NUMA
 767         default y
 768
 769 config ARCH_HAVE_MEMORY_PRESENT
 770         bool
 771         depends on DISCONTIGMEM
 772         default y
 773
 774 config NEED_NODE_MEMMAP_SIZE
 775         bool
 776         depends on DISCONTIGMEM || SPARSEMEM
 777         default y
 778
 779 config HAVE_ARCH_ALLOC_REMAP
 780         bool
 781         depends on NUMA
 782         default y
 783
 784 config ARCH_DISCONTIGMEM_ENABLE
 785         def_bool y
 786         depends on NUMA
 787
 788 config ARCH_DISCONTIGMEM_DEFAULT
 789         def_bool y
 790         depends on NUMA
 791
 792 config ARCH_SPARSEMEM_ENABLE
 793         def_bool y
 794         depends on NUMA
 795
 796 config ARCH_SELECT_MEMORY_MODEL
 797         def_bool y
 798         depends on ARCH_SPARSEMEM_ENABLE
 799
 800 source "mm/Kconfig"
 801
 802 config HAVE_ARCH_EARLY_PFN_TO_NID
 803         bool
 804         default y
 805         depends on NUMA
 806
 807 config HIGHPTE
 808         bool "Allocate 3rd-level pagetables from highmem"
 809         depends on HIGHMEM4G || HIGHMEM64G
 810         help
 811           The VM uses one page table entry for each page of physical memory.
 812           For systems with a lot of RAM, this can be wasteful of precious
 813           low memory.  Setting this option will put user-space page table
 814           entries in high memory.
 815
 816 config MATH_EMULATION
 817         bool "Math emulation"
 818         ---help---
 819           Linux can emulate a math coprocessor (used for floating point
 820           operations) if you don't have one. 486DX and Pentium processors have
 821           a math coprocessor built in, 486SX and 386 do not, unless you added
 822           a 487DX or 387, respectively. (The messages during boot time can
 823           give you some hints here ["man dmesg"].) Everyone needs either a
 824           coprocessor or this emulation.
 825
 826           If you don't have a math coprocessor, you need to say Y here; if you
 827           say Y here even though you have a coprocessor, the coprocessor will
 828           be used nevertheless. (This behavior can be changed with the kernel
 829           command line option "no387", which comes handy if your coprocessor
 830           is broken. Try "man bootparam" or see the documentation of your boot
 831           loader (lilo or loadlin) about how to pass options to the kernel at
 832           boot time.) This means that it is a good idea to say Y here if you
 833           intend to use this kernel on different machines.
 834
 835           More information about the internals of the Linux math coprocessor
 836           emulation can be found in <file:arch/i386/math-emu/README>.
 837
 838           If you are not sure, say Y; apart from resulting in a 66 KB bigger
 839           kernel, it won't hurt.
 840
 841 config MTRR
 842         bool "MTRR (Memory Type Range Register) support"
 843         ---help---
 844           On Intel P6 family processors (Pentium Pro, Pentium II and later)
 845           the Memory Type Range Registers (MTRRs) may be used to control
 846           processor access to memory ranges. This is most useful if you have
 847           a video (VGA) card on a PCI or AGP bus. Enabling write-combining
 848           allows bus write transfers to be combined into a larger transfer
 849           before bursting over the PCI/AGP bus. This can increase performance
 850           of image write operations 2.5 times or more. Saying Y here creates a
 851           /proc/mtrr file which may be used to manipulate your processor's
 852           MTRRs. Typically the X server should use this.
 853
 854           This code has a reasonably generic interface so that similar
 855           control registers on other processors can be easily supported
 856           as well:
 857
 858           The Cyrix 6x86, 6x86MX and M II processors have Address Range
 859           Registers (ARRs) which provide a similar functionality to MTRRs. For
 860           these, the ARRs are used to emulate the MTRRs.
 861           The AMD K6-2 (stepping 8 and above) and K6-3 processors have two
 862           MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing
 863           write-combining. All of these processors are supported by this code
 864           and it makes sense to say Y here if you have one of them.
 865
 866           Saying Y here also fixes a problem with buggy SMP BIOSes which only
 867           set the MTRRs for the boot CPU and not for the secondary CPUs. This
 868           can lead to all sorts of problems, so it's good to say Y here.
 869
 870           You can safely say Y even if your machine doesn't have MTRRs, you'll
 871           just add about 9 KB to your kernel.
 872
 873           See <file:Documentation/mtrr.txt> for more information.
 874
 875 config EFI
 876         bool "Boot from EFI support (EXPERIMENTAL)"
 877         depends on ACPI
 878         default n
 879         ---help---
 880         This enables the the kernel to boot on EFI platforms using
 881         system configuration information passed to it from the firmware.
 882         This also enables the kernel to use any EFI runtime services that are
 883         available (such as the EFI variable services).
 884
 885         This option is only useful on systems that have EFI firmware
 886         and will result in a kernel image that is ~8k larger.  In addition,
 887         you must use the latest ELILO loader available at
 888         <http://elilo.sourceforge.net> in order to take advantage of
 889         kernel initialization using EFI information (neither GRUB nor LILO know
 890         anything about EFI).  However, even with this option, the resultant
 891         kernel should continue to boot on existing non-EFI platforms.
 892
 893 config IRQBALANCE
 894         bool "Enable kernel irq balancing"
 895         depends on SMP && X86_IO_APIC
 896         default y
 897         help
 898           The default yes will allow the kernel to do irq load balancing.
 899           Saying no will keep the kernel from doing irq load balancing.
 900
 901 config HAVE_DEC_LOCK
 902         bool
 903         depends on (SMP || PREEMPT) && X86_CMPXCHG
 904         default y
 905
 906 # turning this on wastes a bunch of space.
 907 # Summit needs it only when NUMA is on
 908 config BOOT_IOREMAP
 909         bool
 910         depends on (((X86_SUMMIT || X86_GENERICARCH) && NUMA) || (X86 && EFI))
 911         default y
 912
 913 config REGPARM
 914         bool "Use register arguments (EXPERIMENTAL)"
 915         depends on EXPERIMENTAL
 916         default n
 917         help
 918         Compile the kernel with -mregparm=3. This uses a different ABI
 919         and passes the first three arguments of a function call in registers.
 920         This will probably break binary only modules.
 921
 922         This feature is only enabled for gcc-3.0 and later - earlier compilers
 923         generate incorrect output with certain kernel constructs when
 924         -mregparm=3 is used.
 925
 926 config SECCOMP
 927         bool "Enable seccomp to safely compute untrusted bytecode"
 928         depends on PROC_FS
 929         default y
 930         help
 931           This kernel feature is useful for number crunching applications
 932           that may need to compute untrusted bytecode during their
 933           execution. By using pipes or other transports made available to
 934           the process as file descriptors supporting the read/write
 935           syscalls, it's possible to isolate those applications in
 936           their own address space using seccomp. Once seccomp is
 937           enabled via /proc/<pid>/seccomp, it cannot be disabled
 938           and the task is only allowed to execute a few safe syscalls
 939           defined by each seccomp mode.
 940
 941           If unsure, say Y. Only embedded should say N here.
 942
 943 source kernel/Kconfig.hz
 944
 945 config PHYSICAL_START
 946         hex "Physical address where the kernel is loaded" if EMBEDDED
 947         default "0x100000"
 948         help
 949           This gives the physical address where the kernel is loaded.
 950           Primarily used in the case of kexec on panic where the
 951           fail safe kernel needs to run at a different address than
 952           the panic-ed kernel.
 953
 954           Don't change this unless you know what you are doing.
 955
 956 config KEXEC
 957         bool "kexec system call (EXPERIMENTAL)"
 958         depends on EXPERIMENTAL
 959         help
 960           kexec is a system call that implements the ability to shutdown your
 961           current kernel, and to start another kernel.  It is like a reboot
 962           but it is indepedent of the system firmware.   And like a reboot
 963           you can start any kernel with it, not just Linux.
 964
 965           The name comes from the similiarity to the exec system call.
 966
 967           It is an ongoing process to be certain the hardware in a machine
 968           is properly shutdown, so do not be surprised if this code does not
 969           initially work for you.  It may help to enable device hotplugging
 970           support.  As of this writing the exact hardware interface is
 971           strongly in flux, so no good recommendation can be made.
 972
 973 config CRASH_DUMP
 974         bool "kernel crash dumps (EXPERIMENTAL)"
 975         depends on EMBEDDED
 976         depends on EXPERIMENTAL
 977         depends on HIGHMEM
 978         help
 979           Generate crash dump after being started by kexec.
 980 endmenu
 981
 982
 983 menu "Power management options (ACPI, APM)"
 984         depends on !X86_VOYAGER
 985
 986 source kernel/power/Kconfig
 987
 988 source "drivers/acpi/Kconfig"
 989
 990 menu "APM (Advanced Power Management) BIOS Support"
 991 depends on PM && !X86_VISWS
 992
 993 config APM
 994         tristate "APM (Advanced Power Management) BIOS support"
 995         depends on PM
 996         ---help---
 997           APM is a BIOS specification for saving power using several different
 998           techniques. This is mostly useful for battery powered laptops with
 999           APM compliant BIOSes. If you say Y here, the system time will be
1000           reset after a RESUME operation, the /proc/apm device will provide
1001           battery status information, and user-space programs will receive
1002           notification of APM "events" (e.g. battery status change).
1003
1004           If you select "Y" here, you can disable actual use of the APM
1005           BIOS by passing the "apm=off" option to the kernel at boot time.
1006
1007           Note that the APM support is almost completely disabled for
1008           machines with more than one CPU.
1009
1010           In order to use APM, you will need supporting software. For location
1011           and more information, read <file:Documentation/pm.txt> and the
1012           Battery Powered Linux mini-HOWTO, available from
1013           <http://www.tldp.org/docs.html#howto>.
1014
1015           This driver does not spin down disk drives (see the hdparm(8)
1016           manpage ("man 8 hdparm") for that), and it doesn't turn off
1017           VESA-compliant "green" monitors.
1018
1019           This driver does not support the TI 4000M TravelMate and the ACER
1020           486/DX4/75 because they don't have compliant BIOSes. Many "green"
1021           desktop machines also don't have compliant BIOSes, and this driver
1022           may cause those machines to panic during the boot phase.
1023
1024           Generally, if you don't have a battery in your machine, there isn't
1025           much point in using this driver and you should say N. If you get
1026           random kernel OOPSes or reboots that don't seem to be related to
1027           anything, try disabling/enabling this option (or disabling/enabling
1028           APM in your BIOS).
1029
1030           Some other things you should try when experiencing seemingly random,
1031           "weird" problems:
1032
1033           1) make sure that you have enough swap space and that it is
1034           enabled.
1035           2) pass the "no-hlt" option to the kernel
1036           3) switch on floating point emulation in the kernel and pass
1037           the "no387" option to the kernel
1038           4) pass the "floppy=nodma" option to the kernel
1039           5) pass the "mem=4M" option to the kernel (thereby disabling
1040           all but the first 4 MB of RAM)
1041           6) make sure that the CPU is not over clocked.
1042           7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/>
1043           8) disable the cache from your BIOS settings
1044           9) install a fan for the video card or exchange video RAM
1045           10) install a better fan for the CPU
1046           11) exchange RAM chips
1047           12) exchange the motherboard.
1048
1049           To compile this driver as a module, choose M here: the
1050           module will be called apm.
1051
1052 config APM_IGNORE_USER_SUSPEND
1053         bool "Ignore USER SUSPEND"
1054         depends on APM
1055         help
1056           This option will ignore USER SUSPEND requests. On machines with a
1057           compliant APM BIOS, you want to say N. However, on the NEC Versa M
1058           series notebooks, it is necessary to say Y because of a BIOS bug.
1059
1060 config APM_DO_ENABLE
1061         bool "Enable PM at boot time"
1062         depends on APM
1063         ---help---
1064           Enable APM features at boot time. From page 36 of the APM BIOS
1065           specification: "When disabled, the APM BIOS does not automatically
1066           power manage devices, enter the Standby State, enter the Suspend
1067           State, or take power saving steps in response to CPU Idle calls."
1068           This driver will make CPU Idle calls when Linux is idle (unless this
1069           feature is turned off -- see "Do CPU IDLE calls", below). This
1070           should always save battery power, but more complicated APM features
1071           will be dependent on your BIOS implementation. You may need to turn
1072           this option off if your computer hangs at boot time when using APM
1073           support, or if it beeps continuously instead of suspending. Turn
1074           this off if you have a NEC UltraLite Versa 33/C or a Toshiba
1075           T400CDT. This is off by default since most machines do fine without
1076           this feature.
1077
1078 config APM_CPU_IDLE
1079         bool "Make CPU Idle calls when idle"
1080         depends on APM
1081         help
1082           Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop.
1083           On some machines, this can activate improved power savings, such as
1084           a slowed CPU clock rate, when the machine is idle. These idle calls
1085           are made after the idle loop has run for some length of time (e.g.,
1086           333 mS). On some machines, this will cause a hang at boot time or
1087           whenever the CPU becomes idle. (On machines with more than one CPU,
1088           this option does nothing.)
1089
1090 config APM_DISPLAY_BLANK
1091         bool "Enable console blanking using APM"
1092         depends on APM
1093         help
1094           Enable console blanking using the APM. Some laptops can use this to
1095           turn off the LCD backlight when the screen blanker of the Linux
1096           virtual console blanks the screen. Note that this is only used by
1097           the virtual console screen blanker, and won't turn off the backlight
1098           when using the X Window system. This also doesn't have anything to
1099           do with your VESA-compliant power-saving monitor. Further, this
1100           option doesn't work for all laptops -- it might not turn off your
1101           backlight at all, or it might print a lot of errors to the console,
1102           especially if you are using gpm.
1103
1104 config APM_RTC_IS_GMT
1105         bool "RTC stores time in GMT"
1106         depends on APM
1107         help
1108           Say Y here if your RTC (Real Time Clock a.k.a. hardware clock)
1109           stores the time in GMT (Greenwich Mean Time). Say N if your RTC
1110           stores localtime.
1111
1112           It is in fact recommended to store GMT in your RTC, because then you
1113           don't have to worry about daylight savings time changes. The only
1114           reason not to use GMT in your RTC is if you also run a broken OS
1115           that doesn't understand GMT.
1116
1117 config APM_ALLOW_INTS
1118         bool "Allow interrupts during APM BIOS calls"
1119         depends on APM
1120         help
1121           Normally we disable external interrupts while we are making calls to
1122           the APM BIOS as a measure to lessen the effects of a badly behaving
1123           BIOS implementation.  The BIOS should reenable interrupts if it
1124           needs to.  Unfortunately, some BIOSes do not -- especially those in
1125           many of the newer IBM Thinkpads.  If you experience hangs when you
1126           suspend, try setting this to Y.  Otherwise, say N.
1127
1128 config APM_REAL_MODE_POWER_OFF
1129         bool "Use real mode APM BIOS call to power off"
1130         depends on APM
1131         help
1132           Use real mode APM BIOS calls to switch off the computer. This is
1133           a work-around for a number of buggy BIOSes. Switch this option on if
1134           your computer crashes instead of powering off properly.
1135
1136 endmenu
1137
1138 source "arch/i386/kernel/cpu/cpufreq/Kconfig"
1139
1140 endmenu
1141
1142 menu "Bus options (PCI, PCMCIA, EISA, MCA, ISA)"
1143
1144 config PCI
1145         bool "PCI support" if !X86_VISWS
1146         depends on !X86_VOYAGER
1147         default y if X86_VISWS
1148         help
1149           Find out whether you have a PCI motherboard. PCI is the name of a
1150           bus system, i.e. the way the CPU talks to the other stuff inside
1151           your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1152           VESA. If you have PCI, say Y, otherwise N.
1153
1154           The PCI-HOWTO, available from
1155           <http://www.tldp.org/docs.html#howto>, contains valuable
1156           information about which PCI hardware does work under Linux and which
1157           doesn't.
1158
1159 choice
1160         prompt "PCI access mode"
1161         depends on PCI && !X86_VISWS
1162         default PCI_GOANY
1163         ---help---
1164           On PCI systems, the BIOS can be used to detect the PCI devices and
1165           determine their configuration. However, some old PCI motherboards
1166           have BIOS bugs and may crash if this is done. Also, some embedded
1167           PCI-based systems don't have any BIOS at all. Linux can also try to
1168           detect the PCI hardware directly without using the BIOS.
1169
1170           With this option, you can specify how Linux should detect the
1171           PCI devices. If you choose "BIOS", the BIOS will be used,
1172           if you choose "Direct", the BIOS won't be used, and if you
1173           choose "MMConfig", then PCI Express MMCONFIG will be used.
1174           If you choose "Any", the kernel will try MMCONFIG, then the
1175           direct access method and falls back to the BIOS if that doesn't
1176           work. If unsure, go with the default, which is "Any".
1177
1178 config PCI_GOBIOS
1179         bool "BIOS"
1180
1181 config PCI_GOMMCONFIG
1182         bool "MMConfig"
1183
1184 config PCI_GODIRECT
1185         bool "Direct"
1186
1187 config PCI_GOANY
1188         bool "Any"
1189
1190 endchoice
1191
1192 config PCI_BIOS
1193         bool
1194         depends on !X86_VISWS && PCI && (PCI_GOBIOS || PCI_GOANY)
1195         default y
1196
1197 config PCI_DIRECT
1198         bool
1199         depends on PCI && ((PCI_GODIRECT || PCI_GOANY) || X86_VISWS)
1200         default y
1201
1202 config PCI_MMCONFIG
1203         bool
1204         depends on PCI && ACPI && (PCI_GOMMCONFIG || PCI_GOANY)
1205         select ACPI_BOOT
1206         default y
1207
1208 source "drivers/pci/pcie/Kconfig"
1209
1210 source "drivers/pci/Kconfig"
1211
1212 config ISA_DMA_API
1213         bool
1214         default y
1215
1216 config ISA
1217         bool "ISA support"
1218         depends on !(X86_VOYAGER || X86_VISWS)
1219         help
1220           Find out whether you have ISA slots on your motherboard.  ISA is the
1221           name of a bus system, i.e. the way the CPU talks to the other stuff
1222           inside your box.  Other bus systems are PCI, EISA, MicroChannel
1223           (MCA) or VESA.  ISA is an older system, now being displaced by PCI;
1224           newer boards don't support it.  If you have ISA, say Y, otherwise N.
1225
1226 config EISA
1227         bool "EISA support"
1228         depends on ISA
1229         ---help---
1230           The Extended Industry Standard Architecture (EISA) bus was
1231           developed as an open alternative to the IBM MicroChannel bus.
1232
1233           The EISA bus provided some of the features of the IBM MicroChannel
1234           bus while maintaining backward compatibility with cards made for
1235           the older ISA bus.  The EISA bus saw limited use between 1988 and
1236           1995 when it was made obsolete by the PCI bus.
1237
1238           Say Y here if you are building a kernel for an EISA-based machine.
1239
1240           Otherwise, say N.
1241
1242 source "drivers/eisa/Kconfig"
1243
1244 config MCA
1245         bool "MCA support" if !(X86_VISWS || X86_VOYAGER)
1246         default y if X86_VOYAGER
1247         help
1248           MicroChannel Architecture is found in some IBM PS/2 machines and
1249           laptops.  It is a bus system similar to PCI or ISA. See
1250           <file:Documentation/mca.txt> (and especially the web page given
1251           there) before attempting to build an MCA bus kernel.
1252
1253 source "drivers/mca/Kconfig"
1254
1255 config SCx200
1256         tristate "NatSemi SCx200 support"
1257         depends on !X86_VOYAGER
1258         help
1259           This provides basic support for the National Semiconductor SCx200
1260           processor.  Right now this is just a driver for the GPIO pins.
1261
1262           If you don't know what to do here, say N.
1263
1264           This support is also available as a module.  If compiled as a
1265           module, it will be called scx200.
1266
1267 config HOTPLUG_CPU
1268         bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1269         depends on SMP && HOTPLUG && EXPERIMENTAL
1270         ---help---
1271           Say Y here to experiment with turning CPUs off and on.  CPUs
1272           can be controlled through /sys/devices/system/cpu.
1273
1274           Say N.
1275
1276 source "drivers/pcmcia/Kconfig"
1277
1278 source "drivers/pci/hotplug/Kconfig"
1279
1280 endmenu
1281
1282 menu "Executable file formats"
1283
1284 source "fs/Kconfig.binfmt"
1285
1286 endmenu
1287
1288 source "drivers/Kconfig"
1289
1290 source "fs/Kconfig"
1291
1292 source "arch/i386/oprofile/Kconfig"
1293
1294 source "arch/i386/Kconfig.debug"
1295
1296 source "security/Kconfig"
1297
1298 source "crypto/Kconfig"
1299
1300 source "lib/Kconfig"
1301
1302 #
1303 # Use the generic interrupt handling code in kernel/irq/:
1304 #
1305 config GENERIC_HARDIRQS
1306         bool
1307         default y
1308
1309 config GENERIC_IRQ_PROBE
1310         bool
1311         default y
1312
1313 config X86_SMP
1314         bool
1315         depends on SMP && !X86_VOYAGER
1316         default y
1317
1318 config X86_HT
1319         bool
1320         depends on SMP && !(X86_VISWS || X86_VOYAGER)
1321         default y
1322
1323 config X86_BIOS_REBOOT
1324         bool
1325         depends on !(X86_VISWS || X86_VOYAGER)
1326         default y
1327
1328 config X86_TRAMPOLINE
1329         bool
1330         depends on X86_SMP || (X86_VOYAGER && SMP)
1331         default y
1332
1333 config PC
1334         bool
1335         depends on X86 && !EMBEDDED
1336         default y