arch/x86/Kconfig.cpu

   1 # Put here option for CPU selection and depending optimization
   2 choice
   3         prompt "Processor family"
   4         default M686 if X86_32
   5         default GENERIC_CPU if X86_64
   6
   7 config M486
   8         bool "486"
   9         depends on X86_32
  10         ---help---
  11           This is the processor type of your CPU. This information is
  12           used for optimizing purposes. In order to compile a kernel
  13           that can run on all supported x86 CPU types (albeit not
  14           optimally fast), you can specify "486" here.
  15
  16           Note that the 386 is no longer supported, this includes
  17           AMD/Cyrix/Intel 386DX/DXL/SL/SLC/SX, Cyrix/TI 486DLC/DLC2,
  18           UMC 486SX-S and the NexGen Nx586.
  19
  20           The kernel will not necessarily run on earlier architectures than
  21           the one you have chosen, e.g. a Pentium optimized kernel will run on
  22           a PPro, but not necessarily on a i486.
  23
  24           Here are the settings recommended for greatest speed:
  25           - "486" for the AMD/Cyrix/IBM/Intel 486DX/DX2/DX4 or
  26           SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or U5S.
  27           - "586" for generic Pentium CPUs lacking the TSC
  28           (time stamp counter) register.
  29           - "Pentium-Classic" for the Intel Pentium.
  30           - "Pentium-MMX" for the Intel Pentium MMX.
  31           - "Pentium-Pro" for the Intel Pentium Pro.
  32           - "Pentium-II" for the Intel Pentium II or pre-Coppermine Celeron.
  33           - "Pentium-III" for the Intel Pentium III or Coppermine Celeron.
  34           - "Pentium-4" for the Intel Pentium 4 or P4-based Celeron.
  35           - "K6" for the AMD K6, K6-II and K6-III (aka K6-3D).
  36           - "Athlon" for the AMD K7 family (Athlon/Duron/Thunderbird).
  37           - "Crusoe" for the Transmeta Crusoe series.
  38           - "Efficeon" for the Transmeta Efficeon series.
  39           - "Winchip-C6" for original IDT Winchip.
  40           - "Winchip-2" for IDT Winchips with 3dNow! capabilities.
  41           - "GeodeGX1" for Geode GX1 (Cyrix MediaGX).
  42           - "Geode GX/LX" For AMD Geode GX and LX processors.
  43           - "CyrixIII/VIA C3" for VIA Cyrix III or VIA C3.
  44           - "VIA C3-2" for VIA C3-2 "Nehemiah" (model 9 and above).
  45           - "VIA C7" for VIA C7.
  46
  47           If you don't know what to do, choose "486".
  48
  49 config M586
  50         bool "586/K5/5x86/6x86/6x86MX"
  51         depends on X86_32
  52         ---help---
  53           Select this for an 586 or 686 series processor such as the AMD K5,
  54           the Cyrix 5x86, 6x86 and 6x86MX.  This choice does not
  55           assume the RDTSC (Read Time Stamp Counter) instruction.
  56
  57 config M586TSC
  58         bool "Pentium-Classic"
  59         depends on X86_32
  60         ---help---
  61           Select this for a Pentium Classic processor with the RDTSC (Read
  62           Time Stamp Counter) instruction for benchmarking.
  63
  64 config M586MMX
  65         bool "Pentium-MMX"
  66         depends on X86_32
  67         ---help---
  68           Select this for a Pentium with the MMX graphics/multimedia
  69           extended instructions.
  70
  71 config M686
  72         bool "Pentium-Pro"
  73         depends on X86_32
  74         ---help---
  75           Select this for Intel Pentium Pro chips.  This enables the use of
  76           Pentium Pro extended instructions, and disables the init-time guard
  77           against the f00f bug found in earlier Pentiums.
  78
  79 config MPENTIUMII
  80         bool "Pentium-II/Celeron(pre-Coppermine)"
  81         depends on X86_32
  82         ---help---
  83           Select this for Intel chips based on the Pentium-II and
  84           pre-Coppermine Celeron core.  This option enables an unaligned
  85           copy optimization, compiles the kernel with optimization flags
  86           tailored for the chip, and applies any applicable Pentium Pro
  87           optimizations.
  88
  89 config MPENTIUMIII
  90         bool "Pentium-III/Celeron(Coppermine)/Pentium-III Xeon"
  91         depends on X86_32
  92         ---help---
  93           Select this for Intel chips based on the Pentium-III and
  94           Celeron-Coppermine core.  This option enables use of some
  95           extended prefetch instructions in addition to the Pentium II
  96           extensions.
  97
  98 config MPENTIUMM
  99         bool "Pentium M"
 100         depends on X86_32
 101         ---help---
 102           Select this for Intel Pentium M (not Pentium-4 M)
 103           notebook chips.
 104
 105 config MPENTIUM4
 106         bool "Pentium-4/Celeron(P4-based)/Pentium-4 M/older Xeon"
 107         depends on X86_32
 108         ---help---
 109           Select this for Intel Pentium 4 chips.  This includes the
 110           Pentium 4, Pentium D, P4-based Celeron and Xeon, and
 111           Pentium-4 M (not Pentium M) chips.  This option enables compile
 112           flags optimized for the chip, uses the correct cache line size, and
 113           applies any applicable optimizations.
 114
 115           CPUIDs: F[0-6][1-A] (in /proc/cpuinfo show = cpu family : 15 )
 116
 117           Select this for:
 118             Pentiums (Pentium 4, Pentium D, Celeron, Celeron D) corename:
 119                 -Willamette
 120                 -Northwood
 121                 -Mobile Pentium 4
 122                 -Mobile Pentium 4 M
 123                 -Extreme Edition (Gallatin)
 124                 -Prescott
 125                 -Prescott 2M
 126                 -Cedar Mill
 127                 -Presler
 128                 -Smithfiled
 129             Xeons (Intel Xeon, Xeon MP, Xeon LV, Xeon MV) corename:
 130                 -Foster
 131                 -Prestonia
 132                 -Gallatin
 133                 -Nocona
 134                 -Irwindale
 135                 -Cranford
 136                 -Potomac
 137                 -Paxville
 138                 -Dempsey
 139
 140
 141 config MK6
 142         bool "K6/K6-II/K6-III"
 143         depends on X86_32
 144         ---help---
 145           Select this for an AMD K6-family processor.  Enables use of
 146           some extended instructions, and passes appropriate optimization
 147           flags to GCC.
 148
 149 config MK7
 150         bool "Athlon/Duron/K7"
 151         depends on X86_32
 152         ---help---
 153           Select this for an AMD Athlon K7-family processor.  Enables use of
 154           some extended instructions, and passes appropriate optimization
 155           flags to GCC.
 156
 157 config MK8
 158         bool "Opteron/Athlon64/Hammer/K8"
 159         ---help---
 160           Select this for an AMD Opteron or Athlon64 Hammer-family processor.
 161           Enables use of some extended instructions, and passes appropriate
 162           optimization flags to GCC.
 163
 164 config MCRUSOE
 165         bool "Crusoe"
 166         depends on X86_32
 167         ---help---
 168           Select this for a Transmeta Crusoe processor.  Treats the processor
 169           like a 586 with TSC, and sets some GCC optimization flags (like a
 170           Pentium Pro with no alignment requirements).
 171
 172 config MEFFICEON
 173         bool "Efficeon"
 174         depends on X86_32
 175         ---help---
 176           Select this for a Transmeta Efficeon processor.
 177
 178 config MWINCHIPC6
 179         bool "Winchip-C6"
 180         depends on X86_32
 181         ---help---
 182           Select this for an IDT Winchip C6 chip.  Linux and GCC
 183           treat this chip as a 586TSC with some extended instructions
 184           and alignment requirements.
 185
 186 config MWINCHIP3D
 187         bool "Winchip-2/Winchip-2A/Winchip-3"
 188         depends on X86_32
 189         ---help---
 190           Select this for an IDT Winchip-2, 2A or 3.  Linux and GCC
 191           treat this chip as a 586TSC with some extended instructions
 192           and alignment requirements.  Also enable out of order memory
 193           stores for this CPU, which can increase performance of some
 194           operations.
 195
 196 config MELAN
 197         bool "AMD Elan"
 198         depends on X86_32
 199         ---help---
 200           Select this for an AMD Elan processor.
 201
 202           Do not use this option for K6/Athlon/Opteron processors!
 203
 204 config MGEODEGX1
 205         bool "GeodeGX1"
 206         depends on X86_32
 207         ---help---
 208           Select this for a Geode GX1 (Cyrix MediaGX) chip.
 209
 210 config MGEODE_LX
 211         bool "Geode GX/LX"
 212         depends on X86_32
 213         ---help---
 214           Select this for AMD Geode GX and LX processors.
 215
 216 config MCYRIXIII
 217         bool "CyrixIII/VIA-C3"
 218         depends on X86_32
 219         ---help---
 220           Select this for a Cyrix III or C3 chip.  Presently Linux and GCC
 221           treat this chip as a generic 586. Whilst the CPU is 686 class,
 222           it lacks the cmov extension which gcc assumes is present when
 223           generating 686 code.
 224           Note that Nehemiah (Model 9) and above will not boot with this
 225           kernel due to them lacking the 3DNow! instructions used in earlier
 226           incarnations of the CPU.
 227
 228 config MVIAC3_2
 229         bool "VIA C3-2 (Nehemiah)"
 230         depends on X86_32
 231         ---help---
 232           Select this for a VIA C3 "Nehemiah". Selecting this enables usage
 233           of SSE and tells gcc to treat the CPU as a 686.
 234           Note, this kernel will not boot on older (pre model 9) C3s.
 235
 236 config MVIAC7
 237         bool "VIA C7"
 238         depends on X86_32
 239         ---help---
 240           Select this for a VIA C7.  Selecting this uses the correct cache
 241           shift and tells gcc to treat the CPU as a 686.
 242
 243 config MPSC
 244         bool "Intel P4 / older Netburst based Xeon"
 245         depends on X86_64
 246         ---help---
 247           Optimize for Intel Pentium 4, Pentium D and older Nocona/Dempsey
 248           Xeon CPUs with Intel 64bit which is compatible with x86-64.
 249           Note that the latest Xeons (Xeon 51xx and 53xx) are not based on the
 250           Netburst core and shouldn't use this option. You can distinguish them
 251           using the cpu family field
 252           in /proc/cpuinfo. Family 15 is an older Xeon, Family 6 a newer one.
 253
 254 config MCORE2
 255         bool "Core 2/newer Xeon"
 256         ---help---
 257
 258           Select this for Intel Core 2 and newer Core 2 Xeons (Xeon 51xx and
 259           53xx) CPUs. You can distinguish newer from older Xeons by the CPU
 260           family in /proc/cpuinfo. Newer ones have 6 and older ones 15
 261           (not a typo)
 262
 263 config MATOM
 264         bool "Intel Atom"
 265         ---help---
 266
 267           Select this for the Intel Atom platform. Intel Atom CPUs have an
 268           in-order pipelining architecture and thus can benefit from
 269           accordingly optimized code. Use a recent GCC with specific Atom
 270           support in order to fully benefit from selecting this option.
 271
 272 config GENERIC_CPU
 273         bool "Generic-x86-64"
 274         depends on X86_64
 275         ---help---
 276           Generic x86-64 CPU.
 277           Run equally well on all x86-64 CPUs.
 278
 279 endchoice
 280
 281 config X86_GENERIC
 282         bool "Generic x86 support"
 283         depends on X86_32
 284         ---help---
 285           Instead of just including optimizations for the selected
 286           x86 variant (e.g. PII, Crusoe or Athlon), include some more
 287           generic optimizations as well. This will make the kernel
 288           perform better on x86 CPUs other than that selected.
 289
 290           This is really intended for distributors who need more
 291           generic optimizations.
 292
 293 #
 294 # Define implied options from the CPU selection here
 295 config X86_INTERNODE_CACHE_SHIFT
 296         int
 297         default "12" if X86_VSMP
 298         default X86_L1_CACHE_SHIFT
 299
 300 config X86_L1_CACHE_SHIFT
 301         int
 302         default "7" if MPENTIUM4 || MPSC
 303         default "6" if MK7 || MK8 || MPENTIUMM || MCORE2 || MATOM || MVIAC7 || X86_GENERIC || GENERIC_CPU
 304         default "4" if MELAN || M486 || MGEODEGX1
 305         default "5" if MWINCHIP3D || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX
 306
 307 config X86_PPRO_FENCE
 308         bool "PentiumPro memory ordering errata workaround"
 309         depends on M686 || M586MMX || M586TSC || M586 || M486 || MGEODEGX1
 310         ---help---
 311           Old PentiumPro multiprocessor systems had errata that could cause
 312           memory operations to violate the x86 ordering standard in rare cases.
 313           Enabling this option will attempt to work around some (but not all)
 314           occurrences of this problem, at the cost of much heavier spinlock and
 315           memory barrier operations.
 316
 317           If unsure, say n here. Even distro kernels should think twice before
 318           enabling this: there are few systems, and an unlikely bug.
 319
 320 config X86_F00F_BUG
 321         def_bool y
 322         depends on M586MMX || M586TSC || M586 || M486
 323
 324 config X86_INVD_BUG
 325         def_bool y
 326         depends on M486
 327
 328 config X86_ALIGNMENT_16
 329         def_bool y
 330         depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MELAN || MK6 || M586MMX || M586TSC || M586 || M486 || MVIAC3_2 || MGEODEGX1
 331
 332 config X86_INTEL_USERCOPY
 333         def_bool y
 334         depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK7 || MEFFICEON || MCORE2
 335
 336 config X86_USE_PPRO_CHECKSUM
 337         def_bool y
 338         depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MVIAC7 || MEFFICEON || MGEODE_LX || MCORE2 || MATOM
 339
 340 config X86_USE_3DNOW
 341         def_bool y
 342         depends on (MCYRIXIII || MK7 || MGEODE_LX) && !UML
 343
 344 #
 345 # P6_NOPs are a relatively minor optimization that require a family >=
 346 # 6 processor, except that it is broken on certain VIA chips.
 347 # Furthermore, AMD chips prefer a totally different sequence of NOPs
 348 # (which work on all CPUs).  In addition, it looks like Virtual PC
 349 # does not understand them.
 350 #
 351 # As a result, disallow these if we're not compiling for X86_64 (these
 352 # NOPs do work on all x86-64 capable chips); the list of processors in
 353 # the right-hand clause are the cores that benefit from this optimization.
 354 #
 355 config X86_P6_NOP
 356         def_bool y
 357         depends on X86_64
 358         depends on (MCORE2 || MPENTIUM4 || MPSC)
 359
 360 config X86_TSC
 361         def_bool y
 362         depends on (MWINCHIP3D || MCRUSOE || MEFFICEON || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || MK8 || MVIAC3_2 || MVIAC7 || MGEODEGX1 || MGEODE_LX || MCORE2 || MATOM) || X86_64
 363
 364 config X86_CMPXCHG64
 365         def_bool y
 366         depends on X86_PAE || X86_64 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MATOM
 367
 368 # this should be set for all -march=.. options where the compiler
 369 # generates cmov.
 370 config X86_CMOV
 371         def_bool y
 372         depends on (MK8 || MK7 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MCRUSOE || MEFFICEON || X86_64 || MATOM || MGEODE_LX)
 373
 374 config X86_MINIMUM_CPU_FAMILY
 375         int
 376         default "64" if X86_64
 377         default "6" if X86_32 && X86_P6_NOP
 378         default "5" if X86_32 && X86_CMPXCHG64
 379         default "4"
 380
 381 config X86_DEBUGCTLMSR
 382         def_bool y
 383         depends on !(MK6 || MWINCHIPC6 || MWINCHIP3D || MCYRIXIII || M586MMX || M586TSC || M586 || M486) && !UML
 384
 385 menuconfig PROCESSOR_SELECT
 386         bool "Supported processor vendors" if EXPERT
 387         ---help---
 388           This lets you choose what x86 vendor support code your kernel
 389           will include.
 390
 391 config CPU_SUP_INTEL
 392         default y
 393         bool "Support Intel processors" if PROCESSOR_SELECT
 394         ---help---
 395           This enables detection, tunings and quirks for Intel processors
 396
 397           You need this enabled if you want your kernel to run on an
 398           Intel CPU. Disabling this option on other types of CPUs
 399           makes the kernel a tiny bit smaller. Disabling it on an Intel
 400           CPU might render the kernel unbootable.
 401
 402           If unsure, say N.
 403
 404 config CPU_SUP_CYRIX_32
 405         default y
 406         bool "Support Cyrix processors" if PROCESSOR_SELECT
 407         depends on M486 || M586 || M586TSC || M586MMX || (EXPERT && !64BIT)
 408         ---help---
 409           This enables detection, tunings and quirks for Cyrix processors
 410
 411           You need this enabled if you want your kernel to run on a
 412           Cyrix CPU. Disabling this option on other types of CPUs
 413           makes the kernel a tiny bit smaller. Disabling it on a Cyrix
 414           CPU might render the kernel unbootable.
 415
 416           If unsure, say N.
 417
 418 config CPU_SUP_AMD
 419         default y
 420         bool "Support AMD processors" if PROCESSOR_SELECT
 421         ---help---
 422           This enables detection, tunings and quirks for AMD processors
 423
 424           You need this enabled if you want your kernel to run on an
 425           AMD CPU. Disabling this option on other types of CPUs
 426           makes the kernel a tiny bit smaller. Disabling it on an AMD
 427           CPU might render the kernel unbootable.
 428
 429           If unsure, say N.
 430
 431 config CPU_SUP_CENTAUR
 432         default y
 433         bool "Support Centaur processors" if PROCESSOR_SELECT
 434         ---help---
 435           This enables detection, tunings and quirks for Centaur processors
 436
 437           You need this enabled if you want your kernel to run on a
 438           Centaur CPU. Disabling this option on other types of CPUs
 439           makes the kernel a tiny bit smaller. Disabling it on a Centaur
 440           CPU might render the kernel unbootable.
 441
 442           If unsure, say N.
 443
 444 config CPU_SUP_TRANSMETA_32
 445         default y
 446         bool "Support Transmeta processors" if PROCESSOR_SELECT
 447         depends on !64BIT
 448         ---help---
 449           This enables detection, tunings and quirks for Transmeta processors
 450
 451           You need this enabled if you want your kernel to run on a
 452           Transmeta CPU. Disabling this option on other types of CPUs
 453           makes the kernel a tiny bit smaller. Disabling it on a Transmeta
 454           CPU might render the kernel unbootable.
 455
 456           If unsure, say N.
 457
 458 config CPU_SUP_UMC_32
 459         default y
 460         bool "Support UMC processors" if PROCESSOR_SELECT
 461         depends on M486 || (EXPERT && !64BIT)
 462         ---help---
 463           This enables detection, tunings and quirks for UMC processors
 464
 465           You need this enabled if you want your kernel to run on a
 466           UMC CPU. Disabling this option on other types of CPUs
 467           makes the kernel a tiny bit smaller. Disabling it on a UMC
 468           CPU might render the kernel unbootable.
 469
 470           If unsure, say N.