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 M386
   8         bool "386"
   9         depends on X86_32 && !UML
  10         ---help---
  11           This is the processor type of your CPU. This information is used for
  12           optimizing purposes. In order to compile a kernel that can run on
  13           all x86 CPU types (albeit not optimally fast), you can specify
  14           "386" here.
  15
  16           The kernel will not necessarily run on earlier architectures than
  17           the one you have chosen, e.g. a Pentium optimized kernel will run on
  18           a PPro, but not necessarily on a i486.
  19
  20           Here are the settings recommended for greatest speed:
  21           - "386" for the AMD/Cyrix/Intel 386DX/DXL/SL/SLC/SX, Cyrix/TI
  22           486DLC/DLC2, and UMC 486SX-S.  Only "386" kernels will run on a 386
  23           class machine.
  24           - "486" for the AMD/Cyrix/IBM/Intel 486DX/DX2/DX4 or
  25           SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or U5S.
  26           - "586" for generic Pentium CPUs lacking the TSC
  27           (time stamp counter) register.
  28           - "Pentium-Classic" for the Intel Pentium.
  29           - "Pentium-MMX" for the Intel Pentium MMX.
  30           - "Pentium-Pro" for the Intel Pentium Pro.
  31           - "Pentium-II" for the Intel Pentium II or pre-Coppermine Celeron.
  32           - "Pentium-III" for the Intel Pentium III or Coppermine Celeron.
  33           - "Pentium-4" for the Intel Pentium 4 or P4-based Celeron.
  34           - "K6" for the AMD K6, K6-II and K6-III (aka K6-3D).
  35           - "Athlon" for the AMD K7 family (Athlon/Duron/Thunderbird).
  36           - "Crusoe" for the Transmeta Crusoe series.
  37           - "Efficeon" for the Transmeta Efficeon series.
  38           - "Winchip-C6" for original IDT Winchip.
  39           - "Winchip-2" for IDT Winchips with 3dNow! capabilities.
  40           - "GeodeGX1" for Geode GX1 (Cyrix MediaGX).
  41           - "Geode GX/LX" For AMD Geode GX and LX processors.
  42           - "CyrixIII/VIA C3" for VIA Cyrix III or VIA C3.
  43           - "VIA C3-2" for VIA C3-2 "Nehemiah" (model 9 and above).
  44           - "VIA C7" for VIA C7.
  45
  46           If you don't know what to do, choose "386".
  47
  48 config M486
  49         bool "486"
  50         depends on X86_32
  51         ---help---
  52           Select this for a 486 series processor, either Intel or one of the
  53           compatible processors from AMD, Cyrix, IBM, or Intel.  Includes DX,
  54           DX2, and DX4 variants; also SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or
  55           U5S.
  56
  57 config M586
  58         bool "586/K5/5x86/6x86/6x86MX"
  59         depends on X86_32
  60         ---help---
  61           Select this for an 586 or 686 series processor such as the AMD K5,
  62           the Cyrix 5x86, 6x86 and 6x86MX.  This choice does not
  63           assume the RDTSC (Read Time Stamp Counter) instruction.
  64
  65 config M586TSC
  66         bool "Pentium-Classic"
  67         depends on X86_32
  68         ---help---
  69           Select this for a Pentium Classic processor with the RDTSC (Read
  70           Time Stamp Counter) instruction for benchmarking.
  71
  72 config M586MMX
  73         bool "Pentium-MMX"
  74         depends on X86_32
  75         ---help---
  76           Select this for a Pentium with the MMX graphics/multimedia
  77           extended instructions.
  78
  79 config M686
  80         bool "Pentium-Pro"
  81         depends on X86_32
  82         ---help---
  83           Select this for Intel Pentium Pro chips.  This enables the use of
  84           Pentium Pro extended instructions, and disables the init-time guard
  85           against the f00f bug found in earlier Pentiums.
  86
  87 config MPENTIUMII
  88         bool "Pentium-II/Celeron(pre-Coppermine)"
  89         depends on X86_32
  90         ---help---
  91           Select this for Intel chips based on the Pentium-II and
  92           pre-Coppermine Celeron core.  This option enables an unaligned
  93           copy optimization, compiles the kernel with optimization flags
  94           tailored for the chip, and applies any applicable Pentium Pro
  95           optimizations.
  96
  97 config MPENTIUMIII
  98         bool "Pentium-III/Celeron(Coppermine)/Pentium-III Xeon"
  99         depends on X86_32
 100         ---help---
 101           Select this for Intel chips based on the Pentium-III and
 102           Celeron-Coppermine core.  This option enables use of some
 103           extended prefetch instructions in addition to the Pentium II
 104           extensions.
 105
 106 config MPENTIUMM
 107         bool "Pentium M"
 108         depends on X86_32
 109         ---help---
 110           Select this for Intel Pentium M (not Pentium-4 M)
 111           notebook chips.
 112
 113 config MPENTIUM4
 114         bool "Pentium-4/Celeron(P4-based)/Pentium-4 M/older Xeon"
 115         depends on X86_32
 116         ---help---
 117           Select this for Intel Pentium 4 chips.  This includes the
 118           Pentium 4, Pentium D, P4-based Celeron and Xeon, and
 119           Pentium-4 M (not Pentium M) chips.  This option enables compile
 120           flags optimized for the chip, uses the correct cache line size, and
 121           applies any applicable optimizations.
 122
 123           CPUIDs: F[0-6][1-A] (in /proc/cpuinfo show = cpu family : 15 )
 124
 125           Select this for:
 126             Pentiums (Pentium 4, Pentium D, Celeron, Celeron D) corename:
 127                 -Willamette
 128                 -Northwood
 129                 -Mobile Pentium 4
 130                 -Mobile Pentium 4 M
 131                 -Extreme Edition (Gallatin)
 132                 -Prescott
 133                 -Prescott 2M
 134                 -Cedar Mill
 135                 -Presler
 136                 -Smithfiled
 137             Xeons (Intel Xeon, Xeon MP, Xeon LV, Xeon MV) corename:
 138                 -Foster
 139                 -Prestonia
 140                 -Gallatin
 141                 -Nocona
 142                 -Irwindale
 143                 -Cranford
 144                 -Potomac
 145                 -Paxville
 146                 -Dempsey
 147
 148
 149 config MK6
 150         bool "K6/K6-II/K6-III"
 151         depends on X86_32
 152         ---help---
 153           Select this for an AMD K6-family processor.  Enables use of
 154           some extended instructions, and passes appropriate optimization
 155           flags to GCC.
 156
 157 config MK7
 158         bool "Athlon/Duron/K7"
 159         depends on X86_32
 160         ---help---
 161           Select this for an AMD Athlon K7-family processor.  Enables use of
 162           some extended instructions, and passes appropriate optimization
 163           flags to GCC.
 164
 165 config MK8
 166         bool "Opteron/Athlon64/Hammer/K8"
 167         ---help---
 168           Select this for an AMD Opteron or Athlon64 Hammer-family processor.
 169           Enables use of some extended instructions, and passes appropriate
 170           optimization flags to GCC.
 171
 172 config MCRUSOE
 173         bool "Crusoe"
 174         depends on X86_32
 175         ---help---
 176           Select this for a Transmeta Crusoe processor.  Treats the processor
 177           like a 586 with TSC, and sets some GCC optimization flags (like a
 178           Pentium Pro with no alignment requirements).
 179
 180 config MEFFICEON
 181         bool "Efficeon"
 182         depends on X86_32
 183         ---help---
 184           Select this for a Transmeta Efficeon processor.
 185
 186 config MWINCHIPC6
 187         bool "Winchip-C6"
 188         depends on X86_32
 189         ---help---
 190           Select this for an IDT Winchip C6 chip.  Linux and GCC
 191           treat this chip as a 586TSC with some extended instructions
 192           and alignment requirements.
 193
 194 config MWINCHIP3D
 195         bool "Winchip-2/Winchip-2A/Winchip-3"
 196         depends on X86_32
 197         ---help---
 198           Select this for an IDT Winchip-2, 2A or 3.  Linux and GCC
 199           treat this chip as a 586TSC with some extended instructions
 200           and alignment requirements.  Also enable out of order memory
 201           stores for this CPU, which can increase performance of some
 202           operations.
 203
 204 config MELAN
 205         bool "AMD Elan"
 206         depends on X86_32
 207         ---help---
 208           Select this for an AMD Elan processor.
 209
 210           Do not use this option for K6/Athlon/Opteron processors!
 211
 212 config MGEODEGX1
 213         bool "GeodeGX1"
 214         depends on X86_32
 215         ---help---
 216           Select this for a Geode GX1 (Cyrix MediaGX) chip.
 217
 218 config MGEODE_LX
 219         bool "Geode GX/LX"
 220         depends on X86_32
 221         ---help---
 222           Select this for AMD Geode GX and LX processors.
 223
 224 config MCYRIXIII
 225         bool "CyrixIII/VIA-C3"
 226         depends on X86_32
 227         ---help---
 228           Select this for a Cyrix III or C3 chip.  Presently Linux and GCC
 229           treat this chip as a generic 586. Whilst the CPU is 686 class,
 230           it lacks the cmov extension which gcc assumes is present when
 231           generating 686 code.
 232           Note that Nehemiah (Model 9) and above will not boot with this
 233           kernel due to them lacking the 3DNow! instructions used in earlier
 234           incarnations of the CPU.
 235
 236 config MVIAC3_2
 237         bool "VIA C3-2 (Nehemiah)"
 238         depends on X86_32
 239         ---help---
 240           Select this for a VIA C3 "Nehemiah". Selecting this enables usage
 241           of SSE and tells gcc to treat the CPU as a 686.
 242           Note, this kernel will not boot on older (pre model 9) C3s.
 243
 244 config MVIAC7
 245         bool "VIA C7"
 246         depends on X86_32
 247         ---help---
 248           Select this for a VIA C7.  Selecting this uses the correct cache
 249           shift and tells gcc to treat the CPU as a 686.
 250
 251 config MPSC
 252         bool "Intel P4 / older Netburst based Xeon"
 253         depends on X86_64
 254         ---help---
 255           Optimize for Intel Pentium 4, Pentium D and older Nocona/Dempsey
 256           Xeon CPUs with Intel 64bit which is compatible with x86-64.
 257           Note that the latest Xeons (Xeon 51xx and 53xx) are not based on the
 258           Netburst core and shouldn't use this option. You can distinguish them
 259           using the cpu family field
 260           in /proc/cpuinfo. Family 15 is an older Xeon, Family 6 a newer one.
 261
 262 config MCORE2
 263         bool "Core 2/newer Xeon"
 264         ---help---
 265
 266           Select this for Intel Core 2 and newer Core 2 Xeons (Xeon 51xx and
 267           53xx) CPUs. You can distinguish newer from older Xeons by the CPU
 268           family in /proc/cpuinfo. Newer ones have 6 and older ones 15
 269           (not a typo)
 270
 271 config MATOM
 272         bool "Intel Atom"
 273         ---help---
 274
 275           Select this for the Intel Atom platform. Intel Atom CPUs have an
 276           in-order pipelining architecture and thus can benefit from
 277           accordingly optimized code. Use a recent GCC with specific Atom
 278           support in order to fully benefit from selecting this option.
 279
 280 config GENERIC_CPU
 281         bool "Generic-x86-64"
 282         depends on X86_64
 283         ---help---
 284           Generic x86-64 CPU.
 285           Run equally well on all x86-64 CPUs.
 286
 287 endchoice
 288
 289 config X86_GENERIC
 290         bool "Generic x86 support"
 291         depends on X86_32
 292         ---help---
 293           Instead of just including optimizations for the selected
 294           x86 variant (e.g. PII, Crusoe or Athlon), include some more
 295           generic optimizations as well. This will make the kernel
 296           perform better on x86 CPUs other than that selected.
 297
 298           This is really intended for distributors who need more
 299           generic optimizations.
 300
 301 #
 302 # Define implied options from the CPU selection here
 303 config X86_INTERNODE_CACHE_SHIFT
 304         int
 305         default "12" if X86_VSMP
 306         default "7" if NUMA
 307         default X86_L1_CACHE_SHIFT
 308
 309 config X86_CMPXCHG
 310         def_bool X86_64 || (X86_32 && !M386)
 311
 312 config CMPXCHG_LOCAL
 313         def_bool X86_64 || (X86_32 && !M386)
 314
 315 config CMPXCHG_DOUBLE
 316         def_bool y
 317
 318 config X86_L1_CACHE_SHIFT
 319         int
 320         default "7" if MPENTIUM4 || MPSC
 321         default "6" if MK7 || MK8 || MPENTIUMM || MCORE2 || MATOM || MVIAC7 || X86_GENERIC || GENERIC_CPU
 322         default "4" if MELAN || M486 || M386 || MGEODEGX1
 323         default "5" if MWINCHIP3D || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX
 324
 325 config X86_XADD
 326         def_bool y
 327         depends on X86_64 || !M386
 328
 329 config X86_PPRO_FENCE
 330         bool "PentiumPro memory ordering errata workaround"
 331         depends on M686 || M586MMX || M586TSC || M586 || M486 || M386 || MGEODEGX1
 332         ---help---
 333           Old PentiumPro multiprocessor systems had errata that could cause
 334           memory operations to violate the x86 ordering standard in rare cases.
 335           Enabling this option will attempt to work around some (but not all)
 336           occurrences of this problem, at the cost of much heavier spinlock and
 337           memory barrier operations.
 338
 339           If unsure, say n here. Even distro kernels should think twice before
 340           enabling this: there are few systems, and an unlikely bug.
 341
 342 config X86_F00F_BUG
 343         def_bool y
 344         depends on M586MMX || M586TSC || M586 || M486 || M386
 345
 346 config X86_INVD_BUG
 347         def_bool y
 348         depends on M486 || M386
 349
 350 config X86_WP_WORKS_OK
 351         def_bool y
 352         depends on !M386
 353
 354 config X86_INVLPG
 355         def_bool y
 356         depends on X86_32 && !M386
 357
 358 config X86_BSWAP
 359         def_bool y
 360         depends on X86_32 && !M386
 361
 362 config X86_POPAD_OK
 363         def_bool y
 364         depends on X86_32 && !M386
 365
 366 config X86_ALIGNMENT_16
 367         def_bool y
 368         depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MELAN || MK6 || M586MMX || M586TSC || M586 || M486 || MVIAC3_2 || MGEODEGX1
 369
 370 config X86_INTEL_USERCOPY
 371         def_bool y
 372         depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK7 || MEFFICEON || MCORE2
 373
 374 config X86_USE_PPRO_CHECKSUM
 375         def_bool y
 376         depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MVIAC7 || MEFFICEON || MGEODE_LX || MCORE2 || MATOM
 377
 378 config X86_USE_3DNOW
 379         def_bool y
 380         depends on (MCYRIXIII || MK7 || MGEODE_LX) && !UML
 381
 382 config X86_OOSTORE
 383         def_bool y
 384         depends on (MWINCHIP3D || MWINCHIPC6) && MTRR
 385
 386 #
 387 # P6_NOPs are a relatively minor optimization that require a family >=
 388 # 6 processor, except that it is broken on certain VIA chips.
 389 # Furthermore, AMD chips prefer a totally different sequence of NOPs
 390 # (which work on all CPUs).  In addition, it looks like Virtual PC
 391 # does not understand them.
 392 #
 393 # As a result, disallow these if we're not compiling for X86_64 (these
 394 # NOPs do work on all x86-64 capable chips); the list of processors in
 395 # the right-hand clause are the cores that benefit from this optimization.
 396 #
 397 config X86_P6_NOP
 398         def_bool y
 399         depends on X86_64
 400         depends on (MCORE2 || MPENTIUM4 || MPSC)
 401
 402 config X86_TSC
 403         def_bool y
 404         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_NUMAQ) || X86_64
 405
 406 config X86_CMPXCHG64
 407         def_bool y
 408         depends on X86_PAE || X86_64 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MATOM
 409
 410 # this should be set for all -march=.. options where the compiler
 411 # generates cmov.
 412 config X86_CMOV
 413         def_bool y
 414         depends on (MK8 || MK7 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MCRUSOE || MEFFICEON || X86_64 || MATOM || MGEODE_LX)
 415
 416 config X86_MINIMUM_CPU_FAMILY
 417         int
 418         default "64" if X86_64
 419         default "6" if X86_32 && X86_P6_NOP
 420         default "5" if X86_32 && X86_CMPXCHG64
 421         default "4" if X86_32 && (X86_XADD || X86_CMPXCHG || X86_BSWAP || X86_WP_WORKS_OK)
 422         default "3"
 423
 424 config X86_DEBUGCTLMSR
 425         def_bool y
 426         depends on !(MK6 || MWINCHIPC6 || MWINCHIP3D || MCYRIXIII || M586MMX || M586TSC || M586 || M486 || M386) && !UML
 427
 428 menuconfig PROCESSOR_SELECT
 429         bool "Supported processor vendors" if EXPERT
 430         ---help---
 431           This lets you choose what x86 vendor support code your kernel
 432           will include.
 433
 434 config CPU_SUP_INTEL
 435         default y
 436         bool "Support Intel processors" if PROCESSOR_SELECT
 437         ---help---
 438           This enables detection, tunings and quirks for Intel processors
 439
 440           You need this enabled if you want your kernel to run on an
 441           Intel CPU. Disabling this option on other types of CPUs
 442           makes the kernel a tiny bit smaller. Disabling it on an Intel
 443           CPU might render the kernel unbootable.
 444
 445           If unsure, say N.
 446
 447 config CPU_SUP_CYRIX_32
 448         default y
 449         bool "Support Cyrix processors" if PROCESSOR_SELECT
 450         depends on !64BIT
 451         ---help---
 452           This enables detection, tunings and quirks for Cyrix processors
 453
 454           You need this enabled if you want your kernel to run on a
 455           Cyrix CPU. Disabling this option on other types of CPUs
 456           makes the kernel a tiny bit smaller. Disabling it on a Cyrix
 457           CPU might render the kernel unbootable.
 458
 459           If unsure, say N.
 460
 461 config CPU_SUP_AMD
 462         default y
 463         bool "Support AMD processors" if PROCESSOR_SELECT
 464         ---help---
 465           This enables detection, tunings and quirks for AMD processors
 466
 467           You need this enabled if you want your kernel to run on an
 468           AMD CPU. Disabling this option on other types of CPUs
 469           makes the kernel a tiny bit smaller. Disabling it on an AMD
 470           CPU might render the kernel unbootable.
 471
 472           If unsure, say N.
 473
 474 config CPU_SUP_CENTAUR
 475         default y
 476         bool "Support Centaur processors" if PROCESSOR_SELECT
 477         ---help---
 478           This enables detection, tunings and quirks for Centaur processors
 479
 480           You need this enabled if you want your kernel to run on a
 481           Centaur CPU. Disabling this option on other types of CPUs
 482           makes the kernel a tiny bit smaller. Disabling it on a Centaur
 483           CPU might render the kernel unbootable.
 484
 485           If unsure, say N.
 486
 487 config CPU_SUP_TRANSMETA_32
 488         default y
 489         bool "Support Transmeta processors" if PROCESSOR_SELECT
 490         depends on !64BIT
 491         ---help---
 492           This enables detection, tunings and quirks for Transmeta processors
 493
 494           You need this enabled if you want your kernel to run on a
 495           Transmeta CPU. Disabling this option on other types of CPUs
 496           makes the kernel a tiny bit smaller. Disabling it on a Transmeta
 497           CPU might render the kernel unbootable.
 498
 499           If unsure, say N.
 500
 501 config CPU_SUP_UMC_32
 502         default y
 503         bool "Support UMC processors" if PROCESSOR_SELECT
 504         depends on !64BIT
 505         ---help---
 506           This enables detection, tunings and quirks for UMC processors
 507
 508           You need this enabled if you want your kernel to run on a
 509           UMC CPU. Disabling this option on other types of CPUs
 510           makes the kernel a tiny bit smaller. Disabling it on a UMC
 511           CPU might render the kernel unbootable.
 512
 513           If unsure, say N.