1 # Put here option for CPU selection and depending optimization
3 prompt "Processor family"
5 default GENERIC_CPU if X86_64
11 This is the processor type of your CPU. This information is
12 used for optimizing purposes. In order to compile a kernel
13 that can run on all supported x86 CPU types (albeit not
14 optimally fast), you can specify "486" here.
16 Note that the 386 is no longer supported, this includes
17 AMD/Cyrix/Intel 386DX/DXL/SL/SLC/SX, Cyrix/TI 486DLC/DLC2,
20 The kernel will not necessarily run on earlier architectures than
21 the one you have chosen, e.g. a Pentium optimized kernel will run on
22 a PPro, but not necessarily on a i486.
24 Here are the settings recommended for greatest speed:
25 - "486" for the AMD/Cyrix/IBM/Intel 486DX/DX2/DX4 or
26 SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or U5S.
27 - "586" for generic Pentium CPUs lacking the TSC
28 (time stamp counter) register.
29 - "Pentium-Classic" for the Intel Pentium.
30 - "Pentium-MMX" for the Intel Pentium MMX.
31 - "Pentium-Pro" for the Intel Pentium Pro.
32 - "Pentium-II" for the Intel Pentium II or pre-Coppermine Celeron.
33 - "Pentium-III" for the Intel Pentium III or Coppermine Celeron.
34 - "Pentium-4" for the Intel Pentium 4 or P4-based Celeron.
35 - "K6" for the AMD K6, K6-II and K6-III (aka K6-3D).
36 - "Athlon" for the AMD K7 family (Athlon/Duron/Thunderbird).
37 - "Crusoe" for the Transmeta Crusoe series.
38 - "Efficeon" for the Transmeta Efficeon series.
39 - "Winchip-C6" for original IDT Winchip.
40 - "Winchip-2" for IDT Winchips with 3dNow! capabilities.
41 - "GeodeGX1" for Geode GX1 (Cyrix MediaGX).
42 - "Geode GX/LX" For AMD Geode GX and LX processors.
43 - "CyrixIII/VIA C3" for VIA Cyrix III or VIA C3.
44 - "VIA C3-2" for VIA C3-2 "Nehemiah" (model 9 and above).
45 - "VIA C7" for VIA C7.
47 If you don't know what to do, choose "486".
50 bool "586/K5/5x86/6x86/6x86MX"
53 Select this for an 586 or 686 series processor such as the AMD K5,
54 the Cyrix 5x86, 6x86 and 6x86MX. This choice does not
55 assume the RDTSC (Read Time Stamp Counter) instruction.
58 bool "Pentium-Classic"
61 Select this for a Pentium Classic processor with the RDTSC (Read
62 Time Stamp Counter) instruction for benchmarking.
68 Select this for a Pentium with the MMX graphics/multimedia
69 extended instructions.
75 Select this for Intel Pentium Pro chips. This enables the use of
76 Pentium Pro extended instructions, and disables the init-time guard
77 against the f00f bug found in earlier Pentiums.
80 bool "Pentium-II/Celeron(pre-Coppermine)"
83 Select this for Intel chips based on the Pentium-II and
84 pre-Coppermine Celeron core. This option enables an unaligned
85 copy optimization, compiles the kernel with optimization flags
86 tailored for the chip, and applies any applicable Pentium Pro
90 bool "Pentium-III/Celeron(Coppermine)/Pentium-III Xeon"
93 Select this for Intel chips based on the Pentium-III and
94 Celeron-Coppermine core. This option enables use of some
95 extended prefetch instructions in addition to the Pentium II
102 Select this for Intel Pentium M (not Pentium-4 M)
106 bool "Pentium-4/Celeron(P4-based)/Pentium-4 M/older Xeon"
109 Select this for Intel Pentium 4 chips. This includes the
110 Pentium 4, Pentium D, P4-based Celeron and Xeon, and
111 Pentium-4 M (not Pentium M) chips. This option enables compile
112 flags optimized for the chip, uses the correct cache line size, and
113 applies any applicable optimizations.
115 CPUIDs: F[0-6][1-A] (in /proc/cpuinfo show = cpu family : 15 )
118 Pentiums (Pentium 4, Pentium D, Celeron, Celeron D) corename:
123 -Extreme Edition (Gallatin)
129 Xeons (Intel Xeon, Xeon MP, Xeon LV, Xeon MV) corename:
142 bool "K6/K6-II/K6-III"
145 Select this for an AMD K6-family processor. Enables use of
146 some extended instructions, and passes appropriate optimization
150 bool "Athlon/Duron/K7"
153 Select this for an AMD Athlon K7-family processor. Enables use of
154 some extended instructions, and passes appropriate optimization
158 bool "Opteron/Athlon64/Hammer/K8"
160 Select this for an AMD Opteron or Athlon64 Hammer-family processor.
161 Enables use of some extended instructions, and passes appropriate
162 optimization flags to GCC.
168 Select this for a Transmeta Crusoe processor. Treats the processor
169 like a 586 with TSC, and sets some GCC optimization flags (like a
170 Pentium Pro with no alignment requirements).
176 Select this for a Transmeta Efficeon processor.
182 Select this for an IDT Winchip C6 chip. Linux and GCC
183 treat this chip as a 586TSC with some extended instructions
184 and alignment requirements.
187 bool "Winchip-2/Winchip-2A/Winchip-3"
190 Select this for an IDT Winchip-2, 2A or 3. Linux and GCC
191 treat this chip as a 586TSC with some extended instructions
192 and alignment requirements. Also enable out of order memory
193 stores for this CPU, which can increase performance of some
200 Select this for an AMD Elan processor.
202 Do not use this option for K6/Athlon/Opteron processors!
208 Select this for a Geode GX1 (Cyrix MediaGX) chip.
214 Select this for AMD Geode GX and LX processors.
217 bool "CyrixIII/VIA-C3"
220 Select this for a Cyrix III or C3 chip. Presently Linux and GCC
221 treat this chip as a generic 586. Whilst the CPU is 686 class,
222 it lacks the cmov extension which gcc assumes is present when
224 Note that Nehemiah (Model 9) and above will not boot with this
225 kernel due to them lacking the 3DNow! instructions used in earlier
226 incarnations of the CPU.
229 bool "VIA C3-2 (Nehemiah)"
232 Select this for a VIA C3 "Nehemiah". Selecting this enables usage
233 of SSE and tells gcc to treat the CPU as a 686.
234 Note, this kernel will not boot on older (pre model 9) C3s.
240 Select this for a VIA C7. Selecting this uses the correct cache
241 shift and tells gcc to treat the CPU as a 686.
244 bool "Intel P4 / older Netburst based Xeon"
247 Optimize for Intel Pentium 4, Pentium D and older Nocona/Dempsey
248 Xeon CPUs with Intel 64bit which is compatible with x86-64.
249 Note that the latest Xeons (Xeon 51xx and 53xx) are not based on the
250 Netburst core and shouldn't use this option. You can distinguish them
251 using the cpu family field
252 in /proc/cpuinfo. Family 15 is an older Xeon, Family 6 a newer one.
255 bool "Core 2/newer Xeon"
258 Select this for Intel Core 2 and newer Core 2 Xeons (Xeon 51xx and
259 53xx) CPUs. You can distinguish newer from older Xeons by the CPU
260 family in /proc/cpuinfo. Newer ones have 6 and older ones 15
267 Select this for the Intel Atom platform. Intel Atom CPUs have an
268 in-order pipelining architecture and thus can benefit from
269 accordingly optimized code. Use a recent GCC with specific Atom
270 support in order to fully benefit from selecting this option.
273 bool "Generic-x86-64"
277 Run equally well on all x86-64 CPUs.
282 bool "Generic x86 support"
285 Instead of just including optimizations for the selected
286 x86 variant (e.g. PII, Crusoe or Athlon), include some more
287 generic optimizations as well. This will make the kernel
288 perform better on x86 CPUs other than that selected.
290 This is really intended for distributors who need more
291 generic optimizations.
294 # Define implied options from the CPU selection here
295 config X86_INTERNODE_CACHE_SHIFT
297 default "12" if X86_VSMP
298 default X86_L1_CACHE_SHIFT
303 config X86_L1_CACHE_SHIFT
305 default "7" if MPENTIUM4 || MPSC
306 default "6" if MK7 || MK8 || MPENTIUMM || MCORE2 || MATOM || MVIAC7 || X86_GENERIC || GENERIC_CPU
307 default "4" if MELAN || M486 || MGEODEGX1
308 default "5" if MWINCHIP3D || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX
313 config X86_PPRO_FENCE
314 bool "PentiumPro memory ordering errata workaround"
315 depends on M686 || M586MMX || M586TSC || M586 || M486 || MGEODEGX1
317 Old PentiumPro multiprocessor systems had errata that could cause
318 memory operations to violate the x86 ordering standard in rare cases.
319 Enabling this option will attempt to work around some (but not all)
320 occurrences of this problem, at the cost of much heavier spinlock and
321 memory barrier operations.
323 If unsure, say n here. Even distro kernels should think twice before
324 enabling this: there are few systems, and an unlikely bug.
328 depends on M586MMX || M586TSC || M586 || M486
334 config X86_WP_WORKS_OK
349 config X86_ALIGNMENT_16
351 depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MELAN || MK6 || M586MMX || M586TSC || M586 || M486 || MVIAC3_2 || MGEODEGX1
353 config X86_INTEL_USERCOPY
355 depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK7 || MEFFICEON || MCORE2
357 config X86_USE_PPRO_CHECKSUM
359 depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MVIAC7 || MEFFICEON || MGEODE_LX || MCORE2 || MATOM
363 depends on (MCYRIXIII || MK7 || MGEODE_LX) && !UML
367 depends on (MWINCHIP3D || MWINCHIPC6) && MTRR
370 # P6_NOPs are a relatively minor optimization that require a family >=
371 # 6 processor, except that it is broken on certain VIA chips.
372 # Furthermore, AMD chips prefer a totally different sequence of NOPs
373 # (which work on all CPUs). In addition, it looks like Virtual PC
374 # does not understand them.
376 # As a result, disallow these if we're not compiling for X86_64 (these
377 # NOPs do work on all x86-64 capable chips); the list of processors in
378 # the right-hand clause are the cores that benefit from this optimization.
383 depends on (MCORE2 || MPENTIUM4 || MPSC)
387 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
391 depends on X86_PAE || X86_64 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MATOM
393 # this should be set for all -march=.. options where the compiler
397 depends on (MK8 || MK7 || MCORE2 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MCRUSOE || MEFFICEON || X86_64 || MATOM || MGEODE_LX)
399 config X86_MINIMUM_CPU_FAMILY
401 default "64" if X86_64
402 default "6" if X86_32 && X86_P6_NOP
403 default "5" if X86_32 && X86_CMPXCHG64
406 config X86_DEBUGCTLMSR
408 depends on !(MK6 || MWINCHIPC6 || MWINCHIP3D || MCYRIXIII || M586MMX || M586TSC || M586 || M486) && !UML
410 menuconfig PROCESSOR_SELECT
411 bool "Supported processor vendors" if EXPERT
413 This lets you choose what x86 vendor support code your kernel
418 bool "Support Intel processors" if PROCESSOR_SELECT
420 This enables detection, tunings and quirks for Intel processors
422 You need this enabled if you want your kernel to run on an
423 Intel CPU. Disabling this option on other types of CPUs
424 makes the kernel a tiny bit smaller. Disabling it on an Intel
425 CPU might render the kernel unbootable.
429 config CPU_SUP_CYRIX_32
431 bool "Support Cyrix processors" if PROCESSOR_SELECT
432 depends on M486 || M586 || M586TSC || M586MMX || (EXPERT && !64BIT)
434 This enables detection, tunings and quirks for Cyrix processors
436 You need this enabled if you want your kernel to run on a
437 Cyrix CPU. Disabling this option on other types of CPUs
438 makes the kernel a tiny bit smaller. Disabling it on a Cyrix
439 CPU might render the kernel unbootable.
445 bool "Support AMD processors" if PROCESSOR_SELECT
447 This enables detection, tunings and quirks for AMD processors
449 You need this enabled if you want your kernel to run on an
450 AMD CPU. Disabling this option on other types of CPUs
451 makes the kernel a tiny bit smaller. Disabling it on an AMD
452 CPU might render the kernel unbootable.
456 config CPU_SUP_CENTAUR
458 bool "Support Centaur processors" if PROCESSOR_SELECT
460 This enables detection, tunings and quirks for Centaur processors
462 You need this enabled if you want your kernel to run on a
463 Centaur CPU. Disabling this option on other types of CPUs
464 makes the kernel a tiny bit smaller. Disabling it on a Centaur
465 CPU might render the kernel unbootable.
469 config CPU_SUP_TRANSMETA_32
471 bool "Support Transmeta processors" if PROCESSOR_SELECT
474 This enables detection, tunings and quirks for Transmeta processors
476 You need this enabled if you want your kernel to run on a
477 Transmeta CPU. Disabling this option on other types of CPUs
478 makes the kernel a tiny bit smaller. Disabling it on a Transmeta
479 CPU might render the kernel unbootable.
483 config CPU_SUP_UMC_32
485 bool "Support UMC processors" if PROCESSOR_SELECT
486 depends on M486 || (EXPERT && !64BIT)
488 This enables detection, tunings and quirks for UMC processors
490 You need this enabled if you want your kernel to run on a
491 UMC CPU. Disabling this option on other types of CPUs
492 makes the kernel a tiny bit smaller. Disabling it on a UMC
493 CPU might render the kernel unbootable.