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
306 default X86_L1_CACHE_SHIFT
310 depends on X86_64 || (X86_32 && !M386)
312 config X86_L1_CACHE_SHIFT
314 default "7" if MPENTIUM4 || MPSC
315 default "6" if MK7 || MK8 || MPENTIUMM || MCORE2 || MATOM || MVIAC7 || X86_GENERIC || GENERIC_CPU
316 default "4" if MELAN || M486 || M386 || MGEODEGX1
317 default "5" if MWINCHIP3D || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX
323 config X86_PPRO_FENCE
324 bool "PentiumPro memory ordering errata workaround"
325 depends on M686 || M586MMX || M586TSC || M586 || M486 || M386 || MGEODEGX1
327 Old PentiumPro multiprocessor systems had errata that could cause
328 memory operations to violate the x86 ordering standard in rare cases.
329 Enabling this option will attempt to work around some (but not all)
330 occurrences of this problem, at the cost of much heavier spinlock and
331 memory barrier operations.
333 If unsure, say n here. Even distro kernels should think twice before
334 enabling this: there are few systems, and an unlikely bug.
338 depends on M586MMX || M586TSC || M586 || M486 || M386
342 depends on M486 || M386
344 config X86_WP_WORKS_OK
350 depends on X86_32 && !M386
354 depends on X86_32 && !M386
358 depends on X86_32 && !M386
360 config X86_ALIGNMENT_16
362 depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MELAN || MK6 || M586MMX || M586TSC || M586 || M486 || MVIAC3_2 || MGEODEGX1
364 config X86_INTEL_USERCOPY
366 depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK7 || MEFFICEON || MCORE2
368 config X86_USE_PPRO_CHECKSUM
370 depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MVIAC7 || MEFFICEON || MGEODE_LX || MCORE2 || MATOM
374 depends on (MCYRIXIII || MK7 || MGEODE_LX) && !UML
378 depends on (MWINCHIP3D || MWINCHIPC6) && MTRR
381 # P6_NOPs are a relatively minor optimization that require a family >=
382 # 6 processor, except that it is broken on certain VIA chips.
383 # Furthermore, AMD chips prefer a totally different sequence of NOPs
384 # (which work on all CPUs). In addition, it looks like Virtual PC
385 # does not understand them.
387 # As a result, disallow these if we're not compiling for X86_64 (these
388 # NOPs do work on all x86-64 capable chips); the list of processors in
389 # the right-hand clause are the cores that benefit from this optimization.
394 depends on (MCORE2 || MPENTIUM4 || MPSC)
398 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 depends on X86_PAE || X86_64 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MATOM
404 # this should be set for all -march=.. options where the compiler
408 depends on (MK8 || MK7 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MCRUSOE || MEFFICEON || X86_64 || MATOM || MGEODE_LX)
410 config X86_MINIMUM_CPU_FAMILY
412 default "64" if X86_64
413 default "6" if X86_32 && X86_P6_NOP
414 default "5" if X86_32 && X86_CMPXCHG64
415 default "4" if X86_32 && (X86_XADD || X86_CMPXCHG || X86_BSWAP || X86_WP_WORKS_OK)
418 config X86_DEBUGCTLMSR
420 depends on !(MK6 || MWINCHIPC6 || MWINCHIP3D || MCYRIXIII || M586MMX || M586TSC || M586 || M486 || M386) && !UML
422 menuconfig PROCESSOR_SELECT
423 bool "Supported processor vendors" if EXPERT
425 This lets you choose what x86 vendor support code your kernel
430 bool "Support Intel processors" if PROCESSOR_SELECT
432 This enables detection, tunings and quirks for Intel processors
434 You need this enabled if you want your kernel to run on an
435 Intel CPU. Disabling this option on other types of CPUs
436 makes the kernel a tiny bit smaller. Disabling it on an Intel
437 CPU might render the kernel unbootable.
441 config CPU_SUP_CYRIX_32
443 bool "Support Cyrix processors" if PROCESSOR_SELECT
444 depends on M386 || M486 || M586 || M586TSC || M586MMX || (EXPERT && !64BIT)
446 This enables detection, tunings and quirks for Cyrix processors
448 You need this enabled if you want your kernel to run on a
449 Cyrix CPU. Disabling this option on other types of CPUs
450 makes the kernel a tiny bit smaller. Disabling it on a Cyrix
451 CPU might render the kernel unbootable.
457 bool "Support AMD processors" if PROCESSOR_SELECT
459 This enables detection, tunings and quirks for AMD processors
461 You need this enabled if you want your kernel to run on an
462 AMD CPU. Disabling this option on other types of CPUs
463 makes the kernel a tiny bit smaller. Disabling it on an AMD
464 CPU might render the kernel unbootable.
468 config CPU_SUP_CENTAUR
470 bool "Support Centaur processors" if PROCESSOR_SELECT
472 This enables detection, tunings and quirks for Centaur processors
474 You need this enabled if you want your kernel to run on a
475 Centaur CPU. Disabling this option on other types of CPUs
476 makes the kernel a tiny bit smaller. Disabling it on a Centaur
477 CPU might render the kernel unbootable.
481 config CPU_SUP_TRANSMETA_32
483 bool "Support Transmeta processors" if PROCESSOR_SELECT
486 This enables detection, tunings and quirks for Transmeta processors
488 You need this enabled if you want your kernel to run on a
489 Transmeta CPU. Disabling this option on other types of CPUs
490 makes the kernel a tiny bit smaller. Disabling it on a Transmeta
491 CPU might render the kernel unbootable.
495 config CPU_SUP_UMC_32
497 bool "Support UMC processors" if PROCESSOR_SELECT
498 depends on M386 || M486 || (EXPERT && !64BIT)
500 This enables detection, tunings and quirks for UMC processors
502 You need this enabled if you want your kernel to run on a
503 UMC CPU. Disabling this option on other types of CPUs
504 makes the kernel a tiny bit smaller. Disabling it on a UMC
505 CPU might render the kernel unbootable.