1 # SPDX-License-Identifier: GPL-2.0
2 # Put here option for CPU selection and depending optimization
4 prompt "Processor family"
6 default GENERIC_CPU if X86_64
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.
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.
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.
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.
50 See each option's help text for additional details. If you don't know
51 what to do, choose "486".
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.
64 Select this for an 486-class CPU such as AMD/Cyrix/IBM/Intel
65 486DX/DX2/DX4 and UMC U5D.
68 bool "586/K5/5x86/6x86/6x86MX"
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.
76 bool "Pentium-Classic"
79 Select this for a Pentium Classic processor with the RDTSC (Read
80 Time Stamp Counter) instruction for benchmarking.
86 Select this for a Pentium with the MMX graphics/multimedia
87 extended instructions.
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.
98 bool "Pentium-II/Celeron(pre-Coppermine)"
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
108 bool "Pentium-III/Celeron(Coppermine)/Pentium-III Xeon"
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
120 Select this for Intel Pentium M (not Pentium-4 M)
124 bool "Pentium-4/Celeron(P4-based)/Pentium-4 M/older Xeon"
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.
133 CPUIDs: F[0-6][1-A] (in /proc/cpuinfo show = cpu family : 15 )
136 Pentiums (Pentium 4, Pentium D, Celeron, Celeron D) corename:
141 -Extreme Edition (Gallatin)
147 Xeons (Intel Xeon, Xeon MP, Xeon LV, Xeon MV) corename:
160 bool "K6/K6-II/K6-III"
163 Select this for an AMD K6-family processor. Enables use of
164 some extended instructions, and passes appropriate optimization
168 bool "Athlon/Duron/K7"
171 Select this for an AMD Athlon K7-family processor. Enables use of
172 some extended instructions, and passes appropriate optimization
176 bool "Opteron/Athlon64/Hammer/K8"
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.
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).
194 Select this for a Transmeta Efficeon processor.
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.
205 bool "Winchip-2/Winchip-2A/Winchip-3"
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
218 Select this for an AMD Elan processor.
220 Do not use this option for K6/Athlon/Opteron processors!
226 Select this for a Geode GX1 (Cyrix MediaGX) chip.
232 Select this for AMD Geode GX and LX processors.
235 bool "CyrixIII/VIA-C3"
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
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.
247 bool "VIA C3-2 (Nehemiah)"
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.
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.
262 bool "Intel P4 / older Netburst based Xeon"
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.
273 bool "Core 2/newer Xeon"
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
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.
291 bool "Generic-x86-64"
295 Run equally well on all x86-64 CPUs.
300 bool "Generic x86 support"
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.
308 This is really intended for distributors who need more
309 generic optimizations.
312 # Define implied options from the CPU selection here
313 config X86_INTERNODE_CACHE_SHIFT
315 default "12" if X86_VSMP
316 default X86_L1_CACHE_SHIFT
318 config X86_L1_CACHE_SHIFT
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
327 depends on M586MMX || M586TSC || M586 || M486SX || M486
331 depends on M486SX || M486
333 config X86_ALIGNMENT_16
335 depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MELAN || MK6 || M586MMX || M586TSC || M586 || M486SX || M486 || MVIAC3_2 || MGEODEGX1
337 config X86_INTEL_USERCOPY
339 depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK7 || MEFFICEON || MCORE2
341 config X86_USE_PPRO_CHECKSUM
343 depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MVIAC7 || MEFFICEON || MGEODE_LX || MCORE2 || MATOM
347 depends on (MCYRIXIII || MK7 || MGEODE_LX) && !UML
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.
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.
363 depends on (MCORE2 || MPENTIUM4 || MPSC)
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
371 depends on X86_PAE || X86_64 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586TSC || M586MMX || MATOM || MGEODE_LX || MGEODEGX1 || MK6 || MK7 || MK8
373 # this should be set for all -march=.. options where the compiler
377 depends on (MK8 || MK7 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MCRUSOE || MEFFICEON || X86_64 || MATOM || MGEODE_LX)
379 config X86_MINIMUM_CPU_FAMILY
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
386 config X86_DEBUGCTLMSR
388 depends on !(MK6 || MWINCHIPC6 || MWINCHIP3D || MCYRIXIII || M586MMX || M586TSC || M586 || M486SX || M486) && !UML
392 depends on CPU_SUP_INTEL || CPU_SUP_CENTAUR || CPU_SUP_ZHAOXIN
394 config X86_VMX_FEATURE_NAMES
396 depends on IA32_FEAT_CTL && X86_FEATURE_NAMES
398 menuconfig PROCESSOR_SELECT
399 bool "Supported processor vendors" if EXPERT
401 This lets you choose what x86 vendor support code your kernel
406 bool "Support Intel processors" if PROCESSOR_SELECT
408 This enables detection, tunings and quirks for Intel processors
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.
417 config CPU_SUP_CYRIX_32
419 bool "Support Cyrix processors" if PROCESSOR_SELECT
420 depends on M486SX || M486 || M586 || M586TSC || M586MMX || (EXPERT && !64BIT)
422 This enables detection, tunings and quirks for Cyrix processors
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.
433 bool "Support AMD processors" if PROCESSOR_SELECT
435 This enables detection, tunings and quirks for AMD processors
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.
446 bool "Support Hygon processors" if PROCESSOR_SELECT
449 This enables detection, tunings and quirks for Hygon processors
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.
458 config CPU_SUP_CENTAUR
460 bool "Support Centaur processors" if PROCESSOR_SELECT
462 This enables detection, tunings and quirks for Centaur processors
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.
471 config CPU_SUP_TRANSMETA_32
473 bool "Support Transmeta processors" if PROCESSOR_SELECT
476 This enables detection, tunings and quirks for Transmeta processors
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.
485 config CPU_SUP_UMC_32
487 bool "Support UMC processors" if PROCESSOR_SELECT
488 depends on M486SX || M486 || (EXPERT && !64BIT)
490 This enables detection, tunings and quirks for UMC processors
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.
499 config CPU_SUP_ZHAOXIN
501 bool "Support Zhaoxin processors" if PROCESSOR_SELECT
503 This enables detection, tunings and quirks for Zhaoxin processors
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.