1 # Put here option for CPU selection and depending optimization
3 prompt "Processor family"
5 default GENERIC_CPU if X86_64
9 depends on X86_32 && !UML
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
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.
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
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.
46 If you don't know what to do, choose "386".
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
58 bool "586/K5/5x86/6x86/6x86MX"
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.
66 bool "Pentium-Classic"
69 Select this for a Pentium Classic processor with the RDTSC (Read
70 Time Stamp Counter) instruction for benchmarking.
76 Select this for a Pentium with the MMX graphics/multimedia
77 extended instructions.
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.
88 bool "Pentium-II/Celeron(pre-Coppermine)"
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
98 bool "Pentium-III/Celeron(Coppermine)/Pentium-III Xeon"
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
110 Select this for Intel Pentium M (not Pentium-4 M)
114 bool "Pentium-4/Celeron(P4-based)/Pentium-4 M/older Xeon"
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.
123 CPUIDs: F[0-6][1-A] (in /proc/cpuinfo show = cpu family : 15 )
126 Pentiums (Pentium 4, Pentium D, Celeron, Celeron D) corename:
131 -Extreme Edition (Gallatin)
137 Xeons (Intel Xeon, Xeon MP, Xeon LV, Xeon MV) corename:
150 bool "K6/K6-II/K6-III"
153 Select this for an AMD K6-family processor. Enables use of
154 some extended instructions, and passes appropriate optimization
158 bool "Athlon/Duron/K7"
161 Select this for an AMD Athlon K7-family processor. Enables use of
162 some extended instructions, and passes appropriate optimization
166 bool "Opteron/Athlon64/Hammer/K8"
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.
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).
184 Select this for a Transmeta Efficeon processor.
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.
195 bool "Winchip-2/Winchip-2A/Winchip-3"
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
208 Select this for an AMD Elan processor.
210 Do not use this option for K6/Athlon/Opteron processors!
216 Select this for a Geode GX1 (Cyrix MediaGX) chip.
222 Select this for AMD Geode GX and LX processors.
225 bool "CyrixIII/VIA-C3"
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
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.
237 bool "VIA C3-2 (Nehemiah)"
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.
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.
252 bool "Intel P4 / older Netburst based Xeon"
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.
263 bool "Core 2/newer Xeon"
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
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.
281 bool "Generic-x86-64"
285 Run equally well on all x86-64 CPUs.
290 bool "Generic x86 support"
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.
298 This is really intended for distributors who need more
299 generic optimizations.
302 # Define implied options from the CPU selection here
303 config X86_INTERNODE_CACHE_SHIFT
305 default "12" if X86_VSMP
307 default X86_L1_CACHE_SHIFT
310 def_bool X86_64 || (X86_32 && !M386)
313 def_bool X86_64 || (X86_32 && !M386)
315 config X86_L1_CACHE_SHIFT
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
324 depends on X86_64 || !M386
326 config X86_PPRO_FENCE
327 bool "PentiumPro memory ordering errata workaround"
328 depends on M686 || M586MMX || M586TSC || M586 || M486 || M386 || MGEODEGX1
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.
336 If unsure, say n here. Even distro kernels should think twice before
337 enabling this: there are few systems, and an unlikely bug.
341 depends on M586MMX || M586TSC || M586 || M486 || M386
345 depends on M486 || M386
347 config X86_WP_WORKS_OK
353 depends on X86_32 && !M386
357 depends on X86_32 && !M386
361 depends on X86_32 && !M386
363 config X86_ALIGNMENT_16
365 depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MELAN || MK6 || M586MMX || M586TSC || M586 || M486 || MVIAC3_2 || MGEODEGX1
367 config X86_INTEL_USERCOPY
369 depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK7 || MEFFICEON || MCORE2
371 config X86_USE_PPRO_CHECKSUM
373 depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MVIAC7 || MEFFICEON || MGEODE_LX || MCORE2 || MATOM
377 depends on (MCYRIXIII || MK7 || MGEODE_LX) && !UML
381 depends on (MWINCHIP3D || MWINCHIPC6) && MTRR
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.
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.
397 depends on (MCORE2 || MPENTIUM4 || MPSC)
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
405 depends on X86_PAE || X86_64 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MATOM
407 # this should be set for all -march=.. options where the compiler
411 depends on (MK8 || MK7 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MCRUSOE || MEFFICEON || X86_64 || MATOM || MGEODE_LX)
413 config X86_MINIMUM_CPU_FAMILY
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)
421 config X86_DEBUGCTLMSR
423 depends on !(MK6 || MWINCHIPC6 || MWINCHIP3D || MCYRIXIII || M586MMX || M586TSC || M586 || M486 || M386) && !UML
425 menuconfig PROCESSOR_SELECT
426 bool "Supported processor vendors" if EXPERT
428 This lets you choose what x86 vendor support code your kernel
433 bool "Support Intel processors" if PROCESSOR_SELECT
435 This enables detection, tunings and quirks for Intel processors
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.
444 config CPU_SUP_CYRIX_32
446 bool "Support Cyrix processors" if PROCESSOR_SELECT
449 This enables detection, tunings and quirks for Cyrix processors
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.
460 bool "Support AMD processors" if PROCESSOR_SELECT
462 This enables detection, tunings and quirks for AMD processors
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.
471 config CPU_SUP_CENTAUR
473 bool "Support Centaur processors" if PROCESSOR_SELECT
475 This enables detection, tunings and quirks for Centaur processors
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.
484 config CPU_SUP_TRANSMETA_32
486 bool "Support Transmeta processors" if PROCESSOR_SELECT
489 This enables detection, tunings and quirks for Transmeta processors
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.
498 config CPU_SUP_UMC_32
500 bool "Support UMC processors" if PROCESSOR_SELECT
503 This enables detection, tunings and quirks for UMC processors
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.