1 # Put here option for CPU selection and depending optimization
5 prompt "Processor family"
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, UMC 486SX-S and NexGen Nx586. Only "386" kernels
23 will run on a 386 class machine.
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 Winchip 2.
40 - "Winchip-2A" 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).
46 If you don't know what to do, choose "386".
51 Select this for a 486 series processor, either Intel or one of the
52 compatible processors from AMD, Cyrix, IBM, or Intel. Includes DX,
53 DX2, and DX4 variants; also SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or
57 bool "586/K5/5x86/6x86/6x86MX"
59 Select this for an 586 or 686 series processor such as the AMD K5,
60 the Cyrix 5x86, 6x86 and 6x86MX. This choice does not
61 assume the RDTSC (Read Time Stamp Counter) instruction.
64 bool "Pentium-Classic"
66 Select this for a Pentium Classic processor with the RDTSC (Read
67 Time Stamp Counter) instruction for benchmarking.
72 Select this for a Pentium with the MMX graphics/multimedia
73 extended instructions.
78 Select this for Intel Pentium Pro chips. This enables the use of
79 Pentium Pro extended instructions, and disables the init-time guard
80 against the f00f bug found in earlier Pentiums.
83 bool "Pentium-II/Celeron(pre-Coppermine)"
85 Select this for Intel chips based on the Pentium-II and
86 pre-Coppermine Celeron core. This option enables an unaligned
87 copy optimization, compiles the kernel with optimization flags
88 tailored for the chip, and applies any applicable Pentium Pro
92 bool "Pentium-III/Celeron(Coppermine)/Pentium-III Xeon"
94 Select this for Intel chips based on the Pentium-III and
95 Celeron-Coppermine core. This option enables use of some
96 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/Xeon"
108 Select this for Intel Pentium 4 chips. This includes the
109 Pentium 4, P4-based Celeron and Xeon, and Pentium-4 M
110 (not Pentium M) chips. This option enables compile flags
111 optimized for the chip, uses the correct cache shift, and
112 applies any applicable Pentium III optimizations.
115 bool "K6/K6-II/K6-III"
117 Select this for an AMD K6-family processor. Enables use of
118 some extended instructions, and passes appropriate optimization
122 bool "Athlon/Duron/K7"
124 Select this for an AMD Athlon K7-family processor. Enables use of
125 some extended instructions, and passes appropriate optimization
129 bool "Opteron/Athlon64/Hammer/K8"
131 Select this for an AMD Opteron or Athlon64 Hammer-family processor. Enables
132 use of some extended instructions, and passes appropriate optimization
138 Select this for a Transmeta Crusoe processor. Treats the processor
139 like a 586 with TSC, and sets some GCC optimization flags (like a
140 Pentium Pro with no alignment requirements).
145 Select this for a Transmeta Efficeon processor.
150 Select this for an IDT Winchip C6 chip. Linux and GCC
151 treat this chip as a 586TSC with some extended instructions
152 and alignment requirements.
157 Select this for an IDT Winchip-2. Linux and GCC
158 treat this chip as a 586TSC with some extended instructions
159 and alignment requirements.
162 bool "Winchip-2A/Winchip-3"
164 Select this for an IDT Winchip-2A or 3. Linux and GCC
165 treat this chip as a 586TSC with some extended instructions
166 and alignment reqirements. Also enable out of order memory
167 stores for this CPU, which can increase performance of some
173 Select this for a Geode GX1 (Cyrix MediaGX) chip.
178 Select this for AMD Geode GX and LX processors.
181 bool "CyrixIII/VIA-C3"
183 Select this for a Cyrix III or C3 chip. Presently Linux and GCC
184 treat this chip as a generic 586. Whilst the CPU is 686 class,
185 it lacks the cmov extension which gcc assumes is present when
187 Note that Nehemiah (Model 9) and above will not boot with this
188 kernel due to them lacking the 3DNow! instructions used in earlier
189 incarnations of the CPU.
192 bool "VIA C3-2 (Nehemiah)"
194 Select this for a VIA C3 "Nehemiah". Selecting this enables usage
195 of SSE and tells gcc to treat the CPU as a 686.
196 Note, this kernel will not boot on older (pre model 9) C3s.
201 bool "Generic x86 support"
203 Instead of just including optimizations for the selected
204 x86 variant (e.g. PII, Crusoe or Athlon), include some more
205 generic optimizations as well. This will make the kernel
206 perform better on x86 CPUs other than that selected.
208 This is really intended for distributors who need more
209 generic optimizations.
214 # Define implied options from the CPU selection here
226 config X86_L1_CACHE_SHIFT
228 default "7" if MPENTIUM4 || X86_GENERIC
229 default "4" if X86_ELAN || M486 || M386 || MGEODEGX1
230 default "5" if MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX
231 default "6" if MK7 || MK8 || MPENTIUMM
233 config RWSEM_GENERIC_SPINLOCK
238 config RWSEM_XCHGADD_ALGORITHM
243 config GENERIC_CALIBRATE_DELAY
247 config X86_PPRO_FENCE
249 depends on M686 || M586MMX || M586TSC || M586 || M486 || M386 || MGEODEGX1
254 depends on M586MMX || M586TSC || M586 || M486 || M386
257 config X86_WP_WORKS_OK
279 depends on !M386 && !M486
282 config X86_ALIGNMENT_16
284 depends on MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCYRIXIII || X86_ELAN || MK6 || M586MMX || M586TSC || M586 || M486 || MVIAC3_2 || MGEODEGX1
289 depends on MK7 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || MK8 || MEFFICEON
292 config X86_INTEL_USERCOPY
294 depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK8 || MK7 || MEFFICEON
297 config X86_USE_PPRO_CHECKSUM
299 depends on MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MK8 || MVIAC3_2 || MEFFICEON || MGEODE_LX
304 depends on MCYRIXIII || MK7 || MGEODE_LX
309 depends on (MWINCHIP3D || MWINCHIP2 || MWINCHIPC6) && MTRR
314 depends on (MWINCHIP3D || MWINCHIP2 || MCRUSOE || MEFFICEON || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || MK8 || MVIAC3_2 || MGEODEGX1) && !X86_NUMAQ