| # SPDX-License-Identifier: GPL-2.0 |
| # Put here option for CPU selection and depending optimization |
| choice |
| prompt "x86-32 Processor family" |
| depends on X86_32 |
| default M686 |
| help |
| This is the processor type of your CPU. This information is |
| used for optimizing purposes. In order to compile a kernel |
| that can run on all supported x86 CPU types (albeit not |
| optimally fast), you can specify "486" here. |
| |
| Note that the 386 is no longer supported, this includes |
| AMD/Cyrix/Intel 386DX/DXL/SL/SLC/SX, Cyrix/TI 486DLC/DLC2, |
| UMC 486SX-S and the NexGen Nx586. |
| |
| The kernel will not necessarily run on earlier architectures than |
| the one you have chosen, e.g. a Pentium optimized kernel will run on |
| a PPro, but not necessarily on a i486. |
| |
| Here are the settings recommended for greatest speed: |
| - "486" for the AMD/Cyrix/IBM/Intel 486DX/DX2/DX4 or |
| SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5D or U5S. |
| - "586" for generic Pentium CPUs lacking the TSC |
| (time stamp counter) register. |
| - "Pentium-Classic" for the Intel Pentium. |
| - "Pentium-MMX" for the Intel Pentium MMX. |
| - "Pentium-Pro" for the Intel Pentium Pro. |
| - "Pentium-II" for the Intel Pentium II or pre-Coppermine Celeron. |
| - "Pentium-III" for the Intel Pentium III or Coppermine Celeron. |
| - "Pentium-4" for the Intel Pentium 4 or P4-based Celeron. |
| - "K6" for the AMD K6, K6-II and K6-III (aka K6-3D). |
| - "Athlon" for the AMD K7 family (Athlon/Duron/Thunderbird). |
| - "Crusoe" for the Transmeta Crusoe series. |
| - "Efficeon" for the Transmeta Efficeon series. |
| - "Winchip-C6" for original IDT Winchip. |
| - "Winchip-2" for IDT Winchips with 3dNow! capabilities. |
| - "AMD Elan" for the 32-bit AMD Elan embedded CPU. |
| - "GeodeGX1" for Geode GX1 (Cyrix MediaGX). |
| - "Geode GX/LX" For AMD Geode GX and LX processors. |
| - "CyrixIII/VIA C3" for VIA Cyrix III or VIA C3. |
| - "VIA C3-2" for VIA C3-2 "Nehemiah" (model 9 and above). |
| - "VIA C7" for VIA C7. |
| - "Intel Atom" for the Atom-microarchitecture CPUs. |
| |
| See each option's help text for additional details. If you don't know |
| what to do, choose "Pentium-Pro". |
| |
| config M486SX |
| bool "486SX" |
| depends on X86_32 |
| help |
| Select this for an 486-class CPU without an FPU such as |
| AMD/Cyrix/IBM/Intel SL/SLC/SLC2/SLC3/SX/SX2 and UMC U5S. |
| |
| config M486 |
| bool "486DX" |
| depends on X86_32 |
| help |
| Select this for an 486-class CPU such as AMD/Cyrix/IBM/Intel |
| 486DX/DX2/DX4 and UMC U5D. |
| |
| config M586 |
| bool "586/K5/5x86/6x86/6x86MX" |
| depends on X86_32 |
| help |
| Select this for an 586 or 686 series processor such as the AMD K5, |
| the Cyrix 5x86, 6x86 and 6x86MX. This choice does not |
| assume the RDTSC (Read Time Stamp Counter) instruction. |
| |
| config M586TSC |
| bool "Pentium-Classic" |
| depends on X86_32 |
| help |
| Select this for a Pentium Classic processor with the RDTSC (Read |
| Time Stamp Counter) instruction for benchmarking. |
| |
| config M586MMX |
| bool "Pentium-MMX" |
| depends on X86_32 |
| help |
| Select this for a Pentium with the MMX graphics/multimedia |
| extended instructions. |
| |
| config M686 |
| bool "Pentium-Pro" |
| depends on X86_32 |
| help |
| Select this for Intel Pentium Pro chips. This enables the use of |
| Pentium Pro extended instructions, and disables the init-time guard |
| against the f00f bug found in earlier Pentiums. |
| |
| config MPENTIUMII |
| bool "Pentium-II/Celeron(pre-Coppermine)" |
| depends on X86_32 |
| help |
| Select this for Intel chips based on the Pentium-II and |
| pre-Coppermine Celeron core. This option enables an unaligned |
| copy optimization, compiles the kernel with optimization flags |
| tailored for the chip, and applies any applicable Pentium Pro |
| optimizations. |
| |
| config MPENTIUMIII |
| bool "Pentium-III/Celeron(Coppermine)/Pentium-III Xeon" |
| depends on X86_32 |
| help |
| Select this for Intel chips based on the Pentium-III and |
| Celeron-Coppermine core. This option enables use of some |
| extended prefetch instructions in addition to the Pentium II |
| extensions. |
| |
| config MPENTIUMM |
| bool "Pentium M/Pentium Dual Core/Core Solo/Core Duo" |
| depends on X86_32 |
| help |
| Select this for Intel Pentium M (not Pentium-4 M) |
| "Merom" Core Solo/Duo notebook chips |
| |
| config MPENTIUM4 |
| bool "Pentium-4/Celeron(P4-based)/Pentium-4 M/older Xeon" |
| depends on X86_32 |
| help |
| Select this for Intel Pentium 4 chips. This includes the |
| Pentium 4, Pentium D, P4-based Celeron and Xeon, and |
| Pentium-4 M (not Pentium M) chips. This option enables compile |
| flags optimized for the chip, uses the correct cache line size, and |
| applies any applicable optimizations. |
| |
| CPUIDs: F[0-6][1-A] (in /proc/cpuinfo show = cpu family : 15 ) |
| |
| Select this for: |
| Pentiums (Pentium 4, Pentium D, Celeron, Celeron D) corename: |
| -Willamette |
| -Northwood |
| -Mobile Pentium 4 |
| -Mobile Pentium 4 M |
| -Extreme Edition (Gallatin) |
| Xeons (Intel Xeon, Xeon MP, Xeon LV, Xeon MV) corename: |
| -Foster |
| -Prestonia |
| -Gallatin |
| |
| config MK6 |
| bool "K6/K6-II/K6-III" |
| depends on X86_32 |
| help |
| Select this for an AMD K6-family processor. Enables use of |
| some extended instructions, and passes appropriate optimization |
| flags to GCC. |
| |
| config MK7 |
| bool "Athlon/Duron/K7" |
| depends on X86_32 |
| help |
| Select this for an AMD Athlon K7-family processor. Enables use of |
| some extended instructions, and passes appropriate optimization |
| flags to GCC. |
| |
| config MCRUSOE |
| bool "Crusoe" |
| depends on X86_32 |
| help |
| Select this for a Transmeta Crusoe processor. Treats the processor |
| like a 586 with TSC, and sets some GCC optimization flags (like a |
| Pentium Pro with no alignment requirements). |
| |
| config MEFFICEON |
| bool "Efficeon" |
| depends on X86_32 |
| help |
| Select this for a Transmeta Efficeon processor. |
| |
| config MWINCHIPC6 |
| bool "Winchip-C6" |
| depends on X86_32 |
| help |
| Select this for an IDT Winchip C6 chip. Linux and GCC |
| treat this chip as a 586TSC with some extended instructions |
| and alignment requirements. |
| |
| config MWINCHIP3D |
| bool "Winchip-2/Winchip-2A/Winchip-3" |
| depends on X86_32 |
| help |
| Select this for an IDT Winchip-2, 2A or 3. Linux and GCC |
| treat this chip as a 586TSC with some extended instructions |
| and alignment requirements. Also enable out of order memory |
| stores for this CPU, which can increase performance of some |
| operations. |
| |
| config MELAN |
| bool "AMD Elan" |
| depends on X86_32 |
| help |
| Select this for an AMD Elan processor. |
| |
| Do not use this option for K6/Athlon/Opteron processors! |
| |
| config MGEODEGX1 |
| bool "GeodeGX1" |
| depends on X86_32 |
| help |
| Select this for a Geode GX1 (Cyrix MediaGX) chip. |
| |
| config MGEODE_LX |
| bool "Geode GX/LX" |
| depends on X86_32 |
| help |
| Select this for AMD Geode GX and LX processors. |
| |
| config MCYRIXIII |
| bool "CyrixIII/VIA-C3" |
| depends on X86_32 |
| help |
| Select this for a Cyrix III or C3 chip. Presently Linux and GCC |
| treat this chip as a generic 586. Whilst the CPU is 686 class, |
| it lacks the cmov extension which gcc assumes is present when |
| generating 686 code. |
| Note that Nehemiah (Model 9) and above will not boot with this |
| kernel due to them lacking the 3DNow! instructions used in earlier |
| incarnations of the CPU. |
| |
| config MVIAC3_2 |
| bool "VIA C3-2 (Nehemiah)" |
| depends on X86_32 |
| help |
| Select this for a VIA C3 "Nehemiah". Selecting this enables usage |
| of SSE and tells gcc to treat the CPU as a 686. |
| Note, this kernel will not boot on older (pre model 9) C3s. |
| |
| config MVIAC7 |
| bool "VIA C7" |
| depends on X86_32 |
| help |
| Select this for a VIA C7. Selecting this uses the correct cache |
| shift and tells gcc to treat the CPU as a 686. |
| |
| config MATOM |
| bool "Intel Atom" |
| help |
| Select this for the Intel Atom platform. Intel Atom CPUs have an |
| in-order pipelining architecture and thus can benefit from |
| accordingly optimized code. Use a recent GCC with specific Atom |
| support in order to fully benefit from selecting this option. |
| |
| endchoice |
| |
| config CC_HAS_MARCH_NATIVE |
| # This flag might not be available in cross-compilers: |
| def_bool $(cc-option, -march=native) |
| # LLVM 18 has an easily triggered internal compiler error in core |
| # networking code with '-march=native' on certain systems: |
| # https://github.com/llvm/llvm-project/issues/72026 |
| # LLVM 19 introduces an optimization that resolves some high stack |
| # usage warnings that only appear wth '-march=native'. |
| depends on CC_IS_GCC || CLANG_VERSION >= 190100 |
| |
| config X86_NATIVE_CPU |
| bool "Build and optimize for local/native CPU" |
| depends on X86_64 |
| depends on CC_HAS_MARCH_NATIVE |
| help |
| Optimize for the current CPU used to compile the kernel. |
| Use this option if you intend to build the kernel for your |
| local machine. |
| |
| Note that such a kernel might not work optimally on a |
| different x86 machine. |
| |
| If unsure, say N. |
| |
| config X86_GENERIC |
| bool "Generic x86 support" |
| depends on X86_32 |
| help |
| Instead of just including optimizations for the selected |
| x86 variant (e.g. PII, Crusoe or Athlon), include some more |
| generic optimizations as well. This will make the kernel |
| perform better on x86 CPUs other than that selected. |
| |
| This is really intended for distributors who need more |
| generic optimizations. |
| |
| # |
| # Define implied options from the CPU selection here |
| config X86_INTERNODE_CACHE_SHIFT |
| int |
| default "12" if X86_VSMP |
| default X86_L1_CACHE_SHIFT |
| |
| config X86_L1_CACHE_SHIFT |
| int |
| default "7" if MPENTIUM4 |
| default "6" if MK7 || MPENTIUMM || MATOM || MVIAC7 || X86_GENERIC || X86_64 |
| default "4" if MELAN || M486SX || M486 || MGEODEGX1 |
| default "5" if MWINCHIP3D || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX |
| |
| config X86_F00F_BUG |
| def_bool y |
| depends on M586MMX || M586TSC || M586 || M486SX || M486 |
| |
| config X86_INVD_BUG |
| def_bool y |
| depends on M486SX || M486 |
| |
| config X86_ALIGNMENT_16 |
| def_bool y |
| depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MELAN || MK6 || M586MMX || M586TSC || M586 || M486SX || M486 || MVIAC3_2 || MGEODEGX1 |
| |
| config X86_INTEL_USERCOPY |
| def_bool y |
| depends on MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M586MMX || X86_GENERIC || MK7 || MEFFICEON |
| |
| config X86_USE_PPRO_CHECKSUM |
| def_bool y |
| depends on MWINCHIP3D || MWINCHIPC6 || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MEFFICEON || MGEODE_LX || MATOM |
| |
| config X86_TSC |
| def_bool y |
| depends on (MWINCHIP3D || MCRUSOE || MEFFICEON || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || MVIAC3_2 || MVIAC7 || MGEODEGX1 || MGEODE_LX || MATOM) || X86_64 |
| |
| config X86_HAVE_PAE |
| def_bool y |
| depends on MCRUSOE || MEFFICEON || MCYRIXIII || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC7 || MATOM || X86_64 |
| |
| config X86_CX8 |
| def_bool y |
| depends on X86_HAVE_PAE || M586TSC || M586MMX || MK6 || MK7 || MGEODEGX1 || MGEODE_LX |
| |
| # this should be set for all -march=.. options where the compiler |
| # generates cmov. |
| config X86_CMOV |
| def_bool y |
| depends on (MK7 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MCRUSOE || MEFFICEON || MATOM || MGEODE_LX || X86_64) |
| |
| config X86_MINIMUM_CPU_FAMILY |
| int |
| default "64" if X86_64 |
| default "6" if X86_32 && (MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MEFFICEON || MATOM || MK7) |
| default "5" if X86_32 && X86_CX8 |
| default "4" |
| |
| config X86_DEBUGCTLMSR |
| def_bool y |
| depends on !(MK6 || MWINCHIPC6 || MWINCHIP3D || MCYRIXIII || M586MMX || M586TSC || M586 || M486SX || M486) && !UML |
| |
| config IA32_FEAT_CTL |
| def_bool y |
| depends on CPU_SUP_INTEL || CPU_SUP_CENTAUR || CPU_SUP_ZHAOXIN |
| |
| config X86_VMX_FEATURE_NAMES |
| def_bool y |
| depends on IA32_FEAT_CTL |
| |
| menuconfig PROCESSOR_SELECT |
| bool "Supported processor vendors" if EXPERT |
| help |
| This lets you choose what x86 vendor support code your kernel |
| will include. |
| |
| config BROADCAST_TLB_FLUSH |
| def_bool y |
| depends on CPU_SUP_AMD && 64BIT |
| |
| config CPU_SUP_INTEL |
| default y |
| bool "Support Intel processors" if PROCESSOR_SELECT |
| help |
| This enables detection, tunings and quirks for Intel processors |
| |
| You need this enabled if you want your kernel to run on an |
| Intel CPU. Disabling this option on other types of CPUs |
| makes the kernel a tiny bit smaller. Disabling it on an Intel |
| CPU might render the kernel unbootable. |
| |
| If unsure, say N. |
| |
| config CPU_SUP_CYRIX_32 |
| default y |
| bool "Support Cyrix processors" if PROCESSOR_SELECT |
| depends on M486SX || M486 || M586 || M586TSC || M586MMX || (EXPERT && !64BIT) |
| help |
| This enables detection, tunings and quirks for Cyrix processors |
| |
| You need this enabled if you want your kernel to run on a |
| Cyrix CPU. Disabling this option on other types of CPUs |
| makes the kernel a tiny bit smaller. Disabling it on a Cyrix |
| CPU might render the kernel unbootable. |
| |
| If unsure, say N. |
| |
| config CPU_SUP_AMD |
| default y |
| bool "Support AMD processors" if PROCESSOR_SELECT |
| help |
| This enables detection, tunings and quirks for AMD processors |
| |
| You need this enabled if you want your kernel to run on an |
| AMD CPU. Disabling this option on other types of CPUs |
| makes the kernel a tiny bit smaller. Disabling it on an AMD |
| CPU might render the kernel unbootable. |
| |
| If unsure, say N. |
| |
| config CPU_SUP_HYGON |
| default y |
| bool "Support Hygon processors" if PROCESSOR_SELECT |
| select CPU_SUP_AMD |
| help |
| This enables detection, tunings and quirks for Hygon processors |
| |
| You need this enabled if you want your kernel to run on an |
| Hygon CPU. Disabling this option on other types of CPUs |
| makes the kernel a tiny bit smaller. Disabling it on an Hygon |
| CPU might render the kernel unbootable. |
| |
| If unsure, say N. |
| |
| config CPU_SUP_CENTAUR |
| default y |
| bool "Support Centaur processors" if PROCESSOR_SELECT |
| help |
| This enables detection, tunings and quirks for Centaur processors |
| |
| You need this enabled if you want your kernel to run on a |
| Centaur CPU. Disabling this option on other types of CPUs |
| makes the kernel a tiny bit smaller. Disabling it on a Centaur |
| CPU might render the kernel unbootable. |
| |
| If unsure, say N. |
| |
| config CPU_SUP_TRANSMETA_32 |
| default y |
| bool "Support Transmeta processors" if PROCESSOR_SELECT |
| depends on !64BIT |
| help |
| This enables detection, tunings and quirks for Transmeta processors |
| |
| You need this enabled if you want your kernel to run on a |
| Transmeta CPU. Disabling this option on other types of CPUs |
| makes the kernel a tiny bit smaller. Disabling it on a Transmeta |
| CPU might render the kernel unbootable. |
| |
| If unsure, say N. |
| |
| config CPU_SUP_UMC_32 |
| default y |
| bool "Support UMC processors" if PROCESSOR_SELECT |
| depends on M486SX || M486 || (EXPERT && !64BIT) |
| help |
| This enables detection, tunings and quirks for UMC processors |
| |
| You need this enabled if you want your kernel to run on a |
| UMC CPU. Disabling this option on other types of CPUs |
| makes the kernel a tiny bit smaller. Disabling it on a UMC |
| CPU might render the kernel unbootable. |
| |
| If unsure, say N. |
| |
| config CPU_SUP_ZHAOXIN |
| default y |
| bool "Support Zhaoxin processors" if PROCESSOR_SELECT |
| help |
| This enables detection, tunings and quirks for Zhaoxin processors |
| |
| You need this enabled if you want your kernel to run on a |
| Zhaoxin CPU. Disabling this option on other types of CPUs |
| makes the kernel a tiny bit smaller. Disabling it on a Zhaoxin |
| CPU might render the kernel unbootable. |
| |
| If unsure, say N. |
| |
| config CPU_SUP_VORTEX_32 |
| default y |
| bool "Support Vortex processors" if PROCESSOR_SELECT |
| depends on X86_32 |
| help |
| This enables detection, tunings and quirks for Vortex processors |
| |
| You need this enabled if you want your kernel to run on a |
| Vortex CPU. Disabling this option on other types of CPUs |
| makes the kernel a tiny bit smaller. |
| |
| If unsure, say N. |
