arch/x86/Kconfig.cpu

   1 # SPDX-License-Identifier: GPL-2.0
   2 # Put here option for CPU selection and depending optimization
   3 choice
   4         prompt "Processor family"
   5         default M686 if X86_32
   6         default GENERIC_CPU if X86_64
   7         ---help---
   8           This is the processor type of your CPU. This information is
   9           used for optimizing purposes. In order to compile a kernel
  10           that can run on all supported x86 CPU types (albeit not
  11           optimally fast), you can specify "486" here.
  12
  13           Note that the 386 is no longer supported, this includes
  14           AMD/Cyrix/Intel 386DX/DXL/SL/SLC/SX, Cyrix/TI 486DLC/DLC2,
  15           UMC 486SX-S and the NexGen Nx586.
  16
  17           The kernel will not necessarily run on earlier architectures than
  18           the one you have chosen, e.g. a Pentium optimized kernel will run on
  19           a PPro, but not necessarily on a i486.
  20
  21           Here are the settings recommended for greatest speed:
  22           - "486" for the AMD/Cyrix/IBM/Intel 486DX/DX2/DX4 or
  23             SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or U5S.
  24           - "586" for generic Pentium CPUs lacking the TSC
  25             (time stamp counter) register.
  26           - "Pentium-Classic" for the Intel Pentium.
  27           - "Pentium-MMX" for the Intel Pentium MMX.
  28           - "Pentium-Pro" for the Intel Pentium Pro.
  29           - "Pentium-II" for the Intel Pentium II or pre-Coppermine Celeron.
  30           - "Pentium-III" for the Intel Pentium III or Coppermine Celeron.
  31           - "Pentium-4" for the Intel Pentium 4 or P4-based Celeron.
  32           - "K6" for the AMD K6, K6-II and K6-III (aka K6-3D).
  33           - "Athlon" for the AMD K7 family (Athlon/Duron/Thunderbird).
  34           - "Opteron/Athlon64/Hammer/K8" for all K8 and newer AMD CPUs.
  35           - "Crusoe" for the Transmeta Crusoe series.
  36           - "Efficeon" for the Transmeta Efficeon series.
  37           - "Winchip-C6" for original IDT Winchip.
  38           - "Winchip-2" for IDT Winchips with 3dNow! capabilities.
  39           - "AMD Elan" for the 32-bit AMD Elan embedded CPU.
  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           - "Intel P4" for the Pentium 4/Netburst microarchitecture.
  46           - "Core 2/newer Xeon" for all core2 and newer Intel CPUs.
  47           - "Intel Atom" for the Atom-microarchitecture CPUs.
  48           - "Generic-x86-64" for a kernel which runs on any x86-64 CPU.
  49
  50           See each option's help text for additional details. If you don't know
  51           what to do, choose "486".
  52
  53 config M486SX
  54         bool "486SX"
  55         depends on X86_32
  56         ---help---
  57           Select this for an 486-class CPU without an FPU such as
  58           AMD/Cyrix/IBM/Intel SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5S.
  59
  60 config M486
  61         bool "486DX"
  62         depends on X86_32
  63         ---help---
  64           Select this for an 486-class CPU such as AMD/Cyrix/IBM/Intel
  65           486DX/DX2/DX4 and UMC U5D.
  66
  67 config M586
  68         bool "586/K5/5x86/6x86/6x86MX"
  69         depends on X86_32
  70         ---help---
  71           Select this for an 586 or 686 series processor such as the AMD K5,
  72           the Cyrix 5x86, 6x86 and 6x86MX.  This choice does not
  73           assume the RDTSC (Read Time Stamp Counter) instruction.
  74
  75 config M586TSC
  76         bool "Pentium-Classic"
  77         depends on X86_32
  78         ---help---
  79           Select this for a Pentium Classic processor with the RDTSC (Read
  80           Time Stamp Counter) instruction for benchmarking.
  81
  82 config M586MMX
  83         bool "Pentium-MMX"
  84         depends on X86_32
  85         ---help---
  86           Select this for a Pentium with the MMX graphics/multimedia
  87           extended instructions.
  88
  89 config M686
  90         bool "Pentium-Pro"
  91         depends on X86_32
  92         ---help---
  93           Select this for Intel Pentium Pro chips.  This enables the use of
  94           Pentium Pro extended instructions, and disables the init-time guard
  95           against the f00f bug found in earlier Pentiums.
  96
  97 config MPENTIUMII
  98         bool "Pentium-II/Celeron(pre-Coppermine)"
  99         depends on X86_32
 100         ---help---
 101           Select this for Intel chips based on the Pentium-II and
 102           pre-Coppermine Celeron core.  This option enables an unaligned
 103           copy optimization, compiles the kernel with optimization flags
 104           tailored for the chip, and applies any applicable Pentium Pro
 105           optimizations.
 106
 107 config MPENTIUMIII
 108         bool "Pentium-III/Celeron(Coppermine)/Pentium-III Xeon"
 109         depends on X86_32
 110         ---help---
 111           Select this for Intel chips based on the Pentium-III and
 112           Celeron-Coppermine core.  This option enables use of some
 113           extended prefetch instructions in addition to the Pentium II
 114           extensions.
 115
 116 config MPENTIUMM
 117         bool "Pentium M"
 118         depends on X86_32
 119         ---help---
 120           Select this for Intel Pentium M (not Pentium-4 M)
 121           notebook chips.
 122
 123 config MPENTIUM4
 124         bool "Pentium-4/Celeron(P4-based)/Pentium-4 M/older Xeon"
 125         depends on X86_32
 126         ---help---
 127           Select this for Intel Pentium 4 chips.  This includes the
 128           Pentium 4, Pentium D, P4-based Celeron and Xeon, and
 129           Pentium-4 M (not Pentium M) chips.  This option enables compile
 130           flags optimized for the chip, uses the correct cache line size, and
 131           applies any applicable optimizations.
 132
 133           CPUIDs: F[0-6][1-A] (in /proc/cpuinfo show = cpu family : 15 )
 134
 135           Select this for:
 136             Pentiums (Pentium 4, Pentium D, Celeron, Celeron D) corename:
 137                 -Willamette
 138                 -Northwood
 139                 -Mobile Pentium 4
 140                 -Mobile Pentium 4 M
 141                 -Extreme Edition (Gallatin)
 142                 -Prescott
 143                 -Prescott 2M
 144                 -Cedar Mill
 145                 -Presler
 146                 -Smithfiled
 147             Xeons (Intel Xeon, Xeon MP, Xeon LV, Xeon MV) corename:
 148                 -Foster
 149                 -Prestonia
 150                 -Gallatin
 151                 -Nocona
 152                 -Irwindale
 153                 -Cranford
 154                 -Potomac
 155                 -Paxville
 156                 -Dempsey
 157
 158
 159 config MK6
 160         bool "K6/K6-II/K6-III"
 161         depends on X86_32
 162         ---help---
 163           Select this for an AMD K6-family processor.  Enables use of
 164           some extended instructions, and passes appropriate optimization
 165           flags to GCC.
 166
 167 config MK7
 168         bool "Athlon/Duron/K7"
 169         depends on X86_32
 170         ---help---
 171           Select this for an AMD Athlon K7-family processor.  Enables use of
 172           some extended instructions, and passes appropriate optimization
 173           flags to GCC.
 174
 175 config MK8
 176         bool "Opteron/Athlon64/Hammer/K8"
 177         ---help---
 178           Select this for an AMD Opteron or Athlon64 Hammer-family processor.
 179           Enables use of some extended instructions, and passes appropriate
 180           optimization flags to GCC.
 181
 182 config MCRUSOE
 183         bool "Crusoe"
 184         depends on X86_32
 185         ---help---
 186           Select this for a Transmeta Crusoe processor.  Treats the processor
 187           like a 586 with TSC, and sets some GCC optimization flags (like a
 188           Pentium Pro with no alignment requirements).
 189
 190 config MEFFICEON
 191         bool "Efficeon"
 192         depends on X86_32
 193         ---help---
 194           Select this for a Transmeta Efficeon processor.
 195
 196 config MWINCHIPC6
 197         bool "Winchip-C6"
 198         depends on X86_32
 199         ---help---
 200           Select this for an IDT Winchip C6 chip.  Linux and GCC
 201           treat this chip as a 586TSC with some extended instructions
 202           and alignment requirements.
 203
 204 config MWINCHIP3D
 205         bool "Winchip-2/Winchip-2A/Winchip-3"
 206         depends on X86_32
 207         ---help---
 208           Select this for an IDT Winchip-2, 2A or 3.  Linux and GCC
 209           treat this chip as a 586TSC with some extended instructions
 210           and alignment requirements.  Also enable out of order memory
 211           stores for this CPU, which can increase performance of some
 212           operations.
 213
 214 config MELAN
 215         bool "AMD Elan"
 216         depends on X86_32
 217         ---help---
 218           Select this for an AMD Elan processor.
 219
 220           Do not use this option for K6/Athlon/Opteron processors!
 221
 222 config MGEODEGX1
 223         bool "GeodeGX1"
 224         depends on X86_32
 225         ---help---
 226           Select this for a Geode GX1 (Cyrix MediaGX) chip.
 227
 228 config MGEODE_LX
 229         bool "Geode GX/LX"
 230         depends on X86_32
 231         ---help---
 232           Select this for AMD Geode GX and LX processors.
 233
 234 config MCYRIXIII
 235         bool "CyrixIII/VIA-C3"
 236         depends on X86_32
 237         ---help---
 238           Select this for a Cyrix III or C3 chip.  Presently Linux and GCC
 239           treat this chip as a generic 586. Whilst the CPU is 686 class,
 240           it lacks the cmov extension which gcc assumes is present when
 241           generating 686 code.
 242           Note that Nehemiah (Model 9) and above will not boot with this
 243           kernel due to them lacking the 3DNow! instructions used in earlier
 244           incarnations of the CPU.
 245
 246 config MVIAC3_2
 247         bool "VIA C3-2 (Nehemiah)"
 248         depends on X86_32
 249         ---help---
 250           Select this for a VIA C3 "Nehemiah". Selecting this enables usage
 251           of SSE and tells gcc to treat the CPU as a 686.
 252           Note, this kernel will not boot on older (pre model 9) C3s.
 253
 254 config MVIAC7
 255         bool "VIA C7"
 256         depends on X86_32
 257         ---help---
 258           Select this for a VIA C7.  Selecting this uses the correct cache
 259           shift and tells gcc to treat the CPU as a 686.
 260
 261 config MPSC
 262         bool "Intel P4 / older Netburst based Xeon"
 263         depends on X86_64
 264         ---help---
 265           Optimize for Intel Pentium 4, Pentium D and older Nocona/Dempsey
 266           Xeon CPUs with Intel 64bit which is compatible with x86-64.
 267           Note that the latest Xeons (Xeon 51xx and 53xx) are not based on the
 268           Netburst core and shouldn't use this option. You can distinguish them
 269           using the cpu family field
 270           in /proc/cpuinfo. Family 15 is an older Xeon, Family 6 a newer one.
 271
 272 config MCORE2
 273         bool "Core 2/newer Xeon"
 274         ---help---
 275
 276           Select this for Intel Core 2 and newer Core 2 Xeons (Xeon 51xx and
 277           53xx) CPUs. You can distinguish newer from older Xeons by the CPU
 278           family in /proc/cpuinfo. Newer ones have 6 and older ones 15
 279           (not a typo)
 280
 281 config MATOM
 282         bool "Intel Atom"
 283         ---help---
 284
 285           Select this for the Intel Atom platform. Intel Atom CPUs have an
 286           in-order pipelining architecture and thus can benefit from
 287           accordingly optimized code. Use a recent GCC with specific Atom
 288           support in order to fully benefit from selecting this option.
 289
 290 config GENERIC_CPU
 291         bool "Generic-x86-64"
 292         depends on X86_64
 293         ---help---
 294           Generic x86-64 CPU.
 295           Run equally well on all x86-64 CPUs.
 296
 297 endchoice
 298
 299 config X86_GENERIC
 300         bool "Generic x86 support"
 301         depends on X86_32
 302         ---help---
 303           Instead of just including optimizations for the selected
 304           x86 variant (e.g. PII, Crusoe or Athlon), include some more
 305           generic optimizations as well. This will make the kernel
 306           perform better on x86 CPUs other than that selected.
 307
 308           This is really intended for distributors who need more
 309           generic optimizations.
 310
 311 #
 312 # Define implied options from the CPU selection here
 313 config X86_INTERNODE_CACHE_SHIFT
 314         int
 315         default "12" if X86_VSMP
 316         default X86_L1_CACHE_SHIFT
 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 || M486SX || M486 || 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_F00F_BUG
 326         def_bool y
 327         depends on M586MMX || M586TSC || M586 || M486SX || M486
 328
 329 config X86_INVD_BUG
 330         def_bool y
 331         depends on M486SX || M486
 332
 333 config X86_ALIGNMENT_16
 334         def_bool y
 335         depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MELAN || MK6 || M586MMX || M586TSC || M586 || M486SX || M486 || MVIAC3_2 || MGEODEGX1
 336
 337 config X86_INTEL_USERCOPY
 338         def_bool y
 339         depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK7 || MEFFICEON || MCORE2
 340
 341 config X86_USE_PPRO_CHECKSUM
 342         def_bool y
 343         depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MVIAC7 || MEFFICEON || MGEODE_LX || MCORE2 || MATOM
 344
 345 config X86_USE_3DNOW
 346         def_bool y
 347         depends on (MCYRIXIII || MK7 || MGEODE_LX) && !UML
 348
 349 #
 350 # P6_NOPs are a relatively minor optimization that require a family >=
 351 # 6 processor, except that it is broken on certain VIA chips.
 352 # Furthermore, AMD chips prefer a totally different sequence of NOPs
 353 # (which work on all CPUs).  In addition, it looks like Virtual PC
 354 # does not understand them.
 355 #
 356 # As a result, disallow these if we're not compiling for X86_64 (these
 357 # NOPs do work on all x86-64 capable chips); the list of processors in
 358 # the right-hand clause are the cores that benefit from this optimization.
 359 #
 360 config X86_P6_NOP
 361         def_bool y
 362         depends on X86_64
 363         depends on (MCORE2 || MPENTIUM4 || MPSC)
 364
 365 config X86_TSC
 366         def_bool y
 367         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
 368
 369 config X86_CMPXCHG64
 370         def_bool y
 371         depends on X86_PAE || X86_64 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586TSC || M586MMX || MATOM || MGEODE_LX || MGEODEGX1 || MK6 || MK7 || MK8
 372
 373 # this should be set for all -march=.. options where the compiler
 374 # generates cmov.
 375 config X86_CMOV
 376         def_bool y
 377         depends on (MK8 || MK7 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MCRUSOE || MEFFICEON || X86_64 || MATOM || MGEODE_LX)
 378
 379 config X86_MINIMUM_CPU_FAMILY
 380         int
 381         default "64" if X86_64
 382         default "6" if X86_32 && (MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MEFFICEON || MATOM || MCRUSOE || MCORE2 || MK7 || MK8)
 383         default "5" if X86_32 && X86_CMPXCHG64
 384         default "4"
 385
 386 config X86_DEBUGCTLMSR
 387         def_bool y
 388         depends on !(MK6 || MWINCHIPC6 || MWINCHIP3D || MCYRIXIII || M586MMX || M586TSC || M586 || M486SX || M486) && !UML
 389
 390 config IA32_FEAT_CTL
 391         def_bool y
 392         depends on CPU_SUP_INTEL || CPU_SUP_CENTAUR || CPU_SUP_ZHAOXIN
 393
 394 config X86_VMX_FEATURE_NAMES
 395         def_bool y
 396         depends on IA32_FEAT_CTL && X86_FEATURE_NAMES
 397
 398 menuconfig PROCESSOR_SELECT
 399         bool "Supported processor vendors" if EXPERT
 400         ---help---
 401           This lets you choose what x86 vendor support code your kernel
 402           will include.
 403
 404 config CPU_SUP_INTEL
 405         default y
 406         bool "Support Intel processors" if PROCESSOR_SELECT
 407         ---help---
 408           This enables detection, tunings and quirks for Intel processors
 409
 410           You need this enabled if you want your kernel to run on an
 411           Intel CPU. Disabling this option on other types of CPUs
 412           makes the kernel a tiny bit smaller. Disabling it on an Intel
 413           CPU might render the kernel unbootable.
 414
 415           If unsure, say N.
 416
 417 config CPU_SUP_CYRIX_32
 418         default y
 419         bool "Support Cyrix processors" if PROCESSOR_SELECT
 420         depends on M486SX || M486 || M586 || M586TSC || M586MMX || (EXPERT && !64BIT)
 421         ---help---
 422           This enables detection, tunings and quirks for Cyrix processors
 423
 424           You need this enabled if you want your kernel to run on a
 425           Cyrix CPU. Disabling this option on other types of CPUs
 426           makes the kernel a tiny bit smaller. Disabling it on a Cyrix
 427           CPU might render the kernel unbootable.
 428
 429           If unsure, say N.
 430
 431 config CPU_SUP_AMD
 432         default y
 433         bool "Support AMD processors" if PROCESSOR_SELECT
 434         ---help---
 435           This enables detection, tunings and quirks for AMD processors
 436
 437           You need this enabled if you want your kernel to run on an
 438           AMD CPU. Disabling this option on other types of CPUs
 439           makes the kernel a tiny bit smaller. Disabling it on an AMD
 440           CPU might render the kernel unbootable.
 441
 442           If unsure, say N.
 443
 444 config CPU_SUP_HYGON
 445         default y
 446         bool "Support Hygon processors" if PROCESSOR_SELECT
 447         select CPU_SUP_AMD
 448         help
 449           This enables detection, tunings and quirks for Hygon processors
 450
 451           You need this enabled if you want your kernel to run on an
 452           Hygon CPU. Disabling this option on other types of CPUs
 453           makes the kernel a tiny bit smaller. Disabling it on an Hygon
 454           CPU might render the kernel unbootable.
 455
 456           If unsure, say N.
 457
 458 config CPU_SUP_CENTAUR
 459         default y
 460         bool "Support Centaur processors" if PROCESSOR_SELECT
 461         ---help---
 462           This enables detection, tunings and quirks for Centaur processors
 463
 464           You need this enabled if you want your kernel to run on a
 465           Centaur CPU. Disabling this option on other types of CPUs
 466           makes the kernel a tiny bit smaller. Disabling it on a Centaur
 467           CPU might render the kernel unbootable.
 468
 469           If unsure, say N.
 470
 471 config CPU_SUP_TRANSMETA_32
 472         default y
 473         bool "Support Transmeta processors" if PROCESSOR_SELECT
 474         depends on !64BIT
 475         ---help---
 476           This enables detection, tunings and quirks for Transmeta processors
 477
 478           You need this enabled if you want your kernel to run on a
 479           Transmeta CPU. Disabling this option on other types of CPUs
 480           makes the kernel a tiny bit smaller. Disabling it on a Transmeta
 481           CPU might render the kernel unbootable.
 482
 483           If unsure, say N.
 484
 485 config CPU_SUP_UMC_32
 486         default y
 487         bool "Support UMC processors" if PROCESSOR_SELECT
 488         depends on M486SX || M486 || (EXPERT && !64BIT)
 489         ---help---
 490           This enables detection, tunings and quirks for UMC processors
 491
 492           You need this enabled if you want your kernel to run on a
 493           UMC CPU. Disabling this option on other types of CPUs
 494           makes the kernel a tiny bit smaller. Disabling it on a UMC
 495           CPU might render the kernel unbootable.
 496
 497           If unsure, say N.
 498
 499 config CPU_SUP_ZHAOXIN
 500         default y
 501         bool "Support Zhaoxin processors" if PROCESSOR_SELECT
 502         help
 503           This enables detection, tunings and quirks for Zhaoxin processors
 504
 505           You need this enabled if you want your kernel to run on a
 506           Zhaoxin CPU. Disabling this option on other types of CPUs
 507           makes the kernel a tiny bit smaller. Disabling it on a Zhaoxin
 508           CPU might render the kernel unbootable.
 509
 510           If unsure, say N.