arch/x86/Kconfig.cpu

Source file repositories/reference/linux-study-clean/arch/x86/Kconfig.cpu

File Facts

System
Linux kernel
Corpus path
arch/x86/Kconfig.cpu
Extension
.cpu
Size
13171 bytes
Lines
413
Domain
Architecture Layer
Bucket
arch/x86
Inferred role
Architecture Layer: arch/x86
Status
atlas-only

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

# 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 "586" here.

	  Note that the 386 and 486 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, AMD ELAN and all 486 based
	  CPUs.

	  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:
	  - "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.
	  - "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 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

Annotation

Implementation Notes