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