1 # Put here option for CPU selection and depending optimization
5 prompt "Processor family"
7 default GENERIC_CPU if X86_64
11 depends on X86_32 && !UML
13 This is the processor type of your CPU. This information is used for
14 optimizing purposes. In order to compile a kernel that can run on
15 all x86 CPU types (albeit not optimally fast), you can specify
18 The kernel will not necessarily run on earlier architectures than
19 the one you have chosen, e.g. a Pentium optimized kernel will run on
20 a PPro, but not necessarily on a i486.
22 Here are the settings recommended for greatest speed:
23 - "386" for the AMD/Cyrix/Intel 386DX/DXL/SL/SLC/SX, Cyrix/TI
24 486DLC/DLC2, UMC 486SX-S and NexGen Nx586. Only "386" kernels
25 will run on a 386 class machine.
26 - "486" for the AMD/Cyrix/IBM/Intel 486DX/DX2/DX4 or
27 SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or U5S.
28 - "586" for generic Pentium CPUs lacking the TSC
29 (time stamp counter) register.
30 - "Pentium-Classic" for the Intel Pentium.
31 - "Pentium-MMX" for the Intel Pentium MMX.
32 - "Pentium-Pro" for the Intel Pentium Pro.
33 - "Pentium-II" for the Intel Pentium II or pre-Coppermine Celeron.
34 - "Pentium-III" for the Intel Pentium III or Coppermine Celeron.
35 - "Pentium-4" for the Intel Pentium 4 or P4-based Celeron.
36 - "K6" for the AMD K6, K6-II and K6-III (aka K6-3D).
37 - "Athlon" for the AMD K7 family (Athlon/Duron/Thunderbird).
38 - "Crusoe" for the Transmeta Crusoe series.
39 - "Efficeon" for the Transmeta Efficeon series.
40 - "Winchip-C6" for original IDT Winchip.
41 - "Winchip-2" for IDT Winchip 2.
42 - "Winchip-2A" for IDT Winchips with 3dNow! capabilities.
43 - "GeodeGX1" for Geode GX1 (Cyrix MediaGX).
44 - "Geode GX/LX" For AMD Geode GX and LX processors.
45 - "CyrixIII/VIA C3" for VIA Cyrix III or VIA C3.
46 - "VIA C3-2" for VIA C3-2 "Nehemiah" (model 9 and above).
47 - "VIA C7" for VIA C7.
49 If you don't know what to do, choose "386".
55 Select this for a 486 series processor, either Intel or one of the
56 compatible processors from AMD, Cyrix, IBM, or Intel. Includes DX,
57 DX2, and DX4 variants; also SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or
61 bool "586/K5/5x86/6x86/6x86MX"
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.
69 bool "Pentium-Classic"
72 Select this for a Pentium Classic processor with the RDTSC (Read
73 Time Stamp Counter) instruction for benchmarking.
79 Select this for a Pentium with the MMX graphics/multimedia
80 extended instructions.
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.
91 bool "Pentium-II/Celeron(pre-Coppermine)"
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
101 bool "Pentium-III/Celeron(Coppermine)/Pentium-III Xeon"
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
113 Select this for Intel Pentium M (not Pentium-4 M)
117 bool "Pentium-4/Celeron(P4-based)/Pentium-4 M/older Xeon"
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.
126 CPUIDs: F[0-6][1-A] (in /proc/cpuinfo show = cpu family : 15 )
129 Pentiums (Pentium 4, Pentium D, Celeron, Celeron D) corename:
134 -Extreme Edition (Gallatin)
140 Xeons (Intel Xeon, Xeon MP, Xeon LV, Xeon MV) corename:
153 bool "K6/K6-II/K6-III"
156 Select this for an AMD K6-family processor. Enables use of
157 some extended instructions, and passes appropriate optimization
161 bool "Athlon/Duron/K7"
164 Select this for an AMD Athlon K7-family processor. Enables use of
165 some extended instructions, and passes appropriate optimization
169 bool "Opteron/Athlon64/Hammer/K8"
171 Select this for an AMD Opteron or Athlon64 Hammer-family processor. Enables
172 use of some extended instructions, and passes appropriate optimization
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).
187 Select this for a Transmeta Efficeon processor.
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.
201 Select this for an IDT Winchip-2. Linux and GCC
202 treat this chip as a 586TSC with some extended instructions
203 and alignment requirements.
206 bool "Winchip-2A/Winchip-3"
209 Select this for an IDT Winchip-2A or 3. Linux and GCC
210 treat this chip as a 586TSC with some extended instructions
211 and alignment requirements. Also enable out of order memory
212 stores for this CPU, which can increase performance of some
219 Select this for a Geode GX1 (Cyrix MediaGX) chip.
225 Select this for AMD Geode GX and LX processors.
228 bool "CyrixIII/VIA-C3"
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
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.
240 bool "VIA C3-2 (Nehemiah)"
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.
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.
255 bool "Intel P4 / older Netburst based Xeon"
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.
266 bool "Core 2/newer Xeon"
268 Select this for Intel Core 2 and newer Core 2 Xeons (Xeon 51xx and 53xx)
269 CPUs. You can distinguish newer from older Xeons by the CPU family
270 in /proc/cpuinfo. Newer ones have 6 and older ones 15 (not a typo)
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.
296 # Define implied options from the CPU selection here
297 config X86_L1_CACHE_BYTES
299 default "128" if GENERIC_CPU || MPSC
300 default "64" if MK8 || MCORE2
303 config X86_INTERNODE_CACHE_BYTES
305 default "4096" if X86_VSMP
306 default X86_L1_CACHE_BYTES if !X86_VSMP
310 def_bool X86_64 || (X86_32 && !M386)
312 config X86_L1_CACHE_SHIFT
314 default "7" if MPENTIUM4 || X86_GENERIC || GENERIC_CPU || MPSC
315 default "4" if X86_ELAN || M486 || M386 || MGEODEGX1
316 default "5" if MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX
317 default "6" if MK7 || MK8 || MPENTIUMM || MCORE2 || MVIAC7
321 depends on X86_32 && !M386
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 memory
328 operations to violate the x86 ordering standard in rare cases. Enabling this
329 option will attempt to work around some (but not all) occurances of
330 this problem, at the cost of much heavier spinlock and memory barrier
333 If unsure, say n here. Even distro kernels should think twice before enabling
334 this: there are few systems, and an unlikely bug.
338 depends on M586MMX || M586TSC || M586 || M486 || M386
340 config X86_WP_WORKS_OK
342 depends on X86_32 && !M386
346 depends on X86_32 && !M386
350 depends on X86_32 && !M386
354 depends on X86_32 && !M386
356 config X86_ALIGNMENT_16
358 depends on MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCYRIXIII || X86_ELAN || MK6 || M586MMX || M586TSC || M586 || M486 || MVIAC3_2 || MGEODEGX1
362 depends on MK7 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || MK8 || MEFFICEON || MCORE2 || MVIAC7 || X86_64
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 || MWINCHIP2 || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MEFFICEON || MGEODE_LX || MCORE2
374 depends on (MCYRIXIII || MK7 || MGEODE_LX) && !UML
378 depends on (MWINCHIP3D || MWINCHIP2 || 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). As a result, disallow these if we're
385 # compiling X86_GENERIC but not X86_64 (these NOPs do work on all
386 # x86-64 capable chips); the list of processors in the right-hand clause
387 # are the cores that benefit from this optimization.
391 depends on (X86_64 || !X86_GENERIC) && (M686 || MPENTIUMII || MPENTIUMIII || MPENTIUMM || MCORE2 || MPENTIUM4)
395 depends on ((MWINCHIP3D || MWINCHIP2 || MCRUSOE || MEFFICEON || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || MK8 || MVIAC3_2 || MVIAC7 || MGEODEGX1 || MGEODE_LX || MCORE2) && !X86_NUMAQ) || X86_64
397 # this should be set for all -march=.. options where the compiler
401 depends on (MK7 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7)
403 config X86_MINIMUM_CPU_FAMILY
405 default "64" if X86_64
406 default "6" if X86_32 && X86_P6_NOP
407 default "4" if X86_32 && (X86_XADD || X86_CMPXCHG || X86_BSWAP || X86_WP_WORKS_OK)
410 config X86_DEBUGCTLMSR
412 depends on !(M586MMX || M586TSC || M586 || M486 || M386)