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 X86_L1_CACHE_SHIFT
 316         int
 317         default "7" if MPENTIUM4 || MPSC
 318         default "6" if MK7 || MK8 || MPENTIUMM || MCORE2 || MATOM || MVIAC7 || X86_GENERIC || GENERIC_CPU
 319         default "4" if MELAN || M486 || M386 || MGEODEGX1
 320         default "5" if MWINCHIP3D || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX
 321
 322 config X86_XADD
 323         def_bool y
 324         depends on X86_64 || !M386
 325
 326 config X86_PPRO_FENCE
 327         bool "PentiumPro memory ordering errata workaround"
 328         depends on M686 || M586MMX || M586TSC || M586 || M486 || M386 || MGEODEGX1
 329         ---help---
 330           Old PentiumPro multiprocessor systems had errata that could cause
 331           memory operations to violate the x86 ordering standard in rare cases.
 332           Enabling this option will attempt to work around some (but not all)
 333           occurrences of this problem, at the cost of much heavier spinlock and
 334           memory barrier operations.
 335
 336           If unsure, say n here. Even distro kernels should think twice before
 337           enabling this: there are few systems, and an unlikely bug.
 338
 339 config X86_F00F_BUG
 340         def_bool y
 341         depends on M586MMX || M586TSC || M586 || M486 || M386
 342
 343 config X86_INVD_BUG
 344         def_bool y
 345         depends on M486 || M386
 346
 347 config X86_WP_WORKS_OK
 348         def_bool y
 349         depends on !M386
 350
 351 config X86_INVLPG
 352         def_bool y
 353         depends on X86_32 && !M386
 354
 355 config X86_BSWAP
 356         def_bool y
 357         depends on X86_32 && !M386
 358
 359 config X86_POPAD_OK
 360         def_bool y
 361         depends on X86_32 && !M386
 362
 363 config X86_ALIGNMENT_16
 364         def_bool y
 365         depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MELAN || MK6 || M586MMX || M586TSC || M586 || M486 || MVIAC3_2 || MGEODEGX1
 366
 367 config X86_INTEL_USERCOPY
 368         def_bool y
 369         depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK7 || MEFFICEON || MCORE2
 370
 371 config X86_USE_PPRO_CHECKSUM
 372         def_bool y
 373         depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MVIAC7 || MEFFICEON || MGEODE_LX || MCORE2 || MATOM
 374
 375 config X86_USE_3DNOW
 376         def_bool y
 377         depends on (MCYRIXIII || MK7 || MGEODE_LX) && !UML
 378
 379 config X86_OOSTORE
 380         def_bool y
 381         depends on (MWINCHIP3D || MWINCHIPC6) && MTRR
 382
 383 #
 384 # P6_NOPs are a relatively minor optimization that require a family >=
 385 # 6 processor, except that it is broken on certain VIA chips.
 386 # Furthermore, AMD chips prefer a totally different sequence of NOPs
 387 # (which work on all CPUs).  In addition, it looks like Virtual PC
 388 # does not understand them.
 389 #
 390 # As a result, disallow these if we're not compiling for X86_64 (these
 391 # NOPs do work on all x86-64 capable chips); the list of processors in
 392 # the right-hand clause are the cores that benefit from this optimization.
 393 #
 394 config X86_P6_NOP
 395         def_bool y
 396         depends on X86_64
 397         depends on (MCORE2 || MPENTIUM4 || MPSC)
 398
 399 config X86_TSC
 400         def_bool y
 401         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
 402
 403 config X86_CMPXCHG64
 404         def_bool y
 405         depends on X86_PAE || X86_64 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MATOM
 406
 407 # this should be set for all -march=.. options where the compiler
 408 # generates cmov.
 409 config X86_CMOV
 410         def_bool y
 411         depends on (MK8 || MK7 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MCRUSOE || MEFFICEON || X86_64 || MATOM || MGEODE_LX)
 412
 413 config X86_MINIMUM_CPU_FAMILY
 414         int
 415         default "64" if X86_64
 416         default "6" if X86_32 && X86_P6_NOP
 417         default "5" if X86_32 && X86_CMPXCHG64
 418         default "4" if X86_32 && (X86_XADD || X86_CMPXCHG || X86_BSWAP || X86_WP_WORKS_OK)
 419         default "3"
 420
 421 config X86_DEBUGCTLMSR
 422         def_bool y
 423         depends on !(MK6 || MWINCHIPC6 || MWINCHIP3D || MCYRIXIII || M586MMX || M586TSC || M586 || M486 || M386) && !UML
 424
 425 menuconfig PROCESSOR_SELECT
 426         bool "Supported processor vendors" if EXPERT
 427         ---help---
 428           This lets you choose what x86 vendor support code your kernel
 429           will include.
 430
 431 config CPU_SUP_INTEL
 432         default y
 433         bool "Support Intel processors" if PROCESSOR_SELECT
 434         ---help---
 435           This enables detection, tunings and quirks for Intel processors
 436
 437           You need this enabled if you want your kernel to run on an
 438           Intel CPU. Disabling this option on other types of CPUs
 439           makes the kernel a tiny bit smaller. Disabling it on an Intel
 440           CPU might render the kernel unbootable.
 441
 442           If unsure, say N.
 443
 444 config CPU_SUP_CYRIX_32
 445         default y
 446         bool "Support Cyrix processors" if PROCESSOR_SELECT
 447         depends on !64BIT
 448         ---help---
 449           This enables detection, tunings and quirks for Cyrix processors
 450
 451           You need this enabled if you want your kernel to run on a
 452           Cyrix CPU. Disabling this option on other types of CPUs
 453           makes the kernel a tiny bit smaller. Disabling it on a Cyrix
 454           CPU might render the kernel unbootable.
 455
 456           If unsure, say N.
 457
 458 config CPU_SUP_AMD
 459         default y
 460         bool "Support AMD processors" if PROCESSOR_SELECT
 461         ---help---
 462           This enables detection, tunings and quirks for AMD processors
 463
 464           You need this enabled if you want your kernel to run on an
 465           AMD CPU. Disabling this option on other types of CPUs
 466           makes the kernel a tiny bit smaller. Disabling it on an AMD
 467           CPU might render the kernel unbootable.
 468
 469           If unsure, say N.
 470
 471 config CPU_SUP_CENTAUR
 472         default y
 473         bool "Support Centaur processors" if PROCESSOR_SELECT
 474         ---help---
 475           This enables detection, tunings and quirks for Centaur processors
 476
 477           You need this enabled if you want your kernel to run on a
 478           Centaur CPU. Disabling this option on other types of CPUs
 479           makes the kernel a tiny bit smaller. Disabling it on a Centaur
 480           CPU might render the kernel unbootable.
 481
 482           If unsure, say N.
 483
 484 config CPU_SUP_TRANSMETA_32
 485         default y
 486         bool "Support Transmeta processors" if PROCESSOR_SELECT
 487         depends on !64BIT
 488         ---help---
 489           This enables detection, tunings and quirks for Transmeta processors
 490
 491           You need this enabled if you want your kernel to run on a
 492           Transmeta CPU. Disabling this option on other types of CPUs
 493           makes the kernel a tiny bit smaller. Disabling it on a Transmeta
 494           CPU might render the kernel unbootable.
 495
 496           If unsure, say N.
 497
 498 config CPU_SUP_UMC_32
 499         default y
 500         bool "Support UMC processors" if PROCESSOR_SELECT
 501         depends on !64BIT
 502         ---help---
 503           This enables detection, tunings and quirks for UMC processors
 504
 505           You need this enabled if you want your kernel to run on a
 506           UMC CPU. Disabling this option on other types of CPUs
 507           makes the kernel a tiny bit smaller. Disabling it on a UMC
 508           CPU might render the kernel unbootable.
 509
 510           If unsure, say N.