arch/x86/Makefile_32.cpu

Source file repositories/reference/linux-study-clean/arch/x86/Makefile_32.cpu

File Facts

System
Linux kernel
Corpus path
arch/x86/Makefile_32.cpu
Extension
.cpu
Size
1663 bytes
Lines
37
Domain
Architecture Layer
Bucket
arch/x86
Inferred role
Architecture Layer: build/configuration rule
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
# CPU tuning section - shared with UML.
# Must change only cflags-y (or [yn]), not CFLAGS! That makes a difference for UML.

tune		= $(call cc-option,-mtune=$(1),$(2))

ifdef CONFIG_CC_IS_CLANG
align		:= -falign-functions=0 $(call cc-option,-falign-jumps=0) $(call cc-option,-falign-loops=0)
else
align		:= -falign-functions=0 -falign-jumps=0 -falign-loops=0
endif

cflags-$(CONFIG_M586TSC)	+= -march=i586
cflags-$(CONFIG_M586MMX)	+= -march=pentium-mmx
cflags-$(CONFIG_M686)		+= -march=i686
cflags-$(CONFIG_MPENTIUMII)	+= -march=i686 $(call tune,pentium2)
cflags-$(CONFIG_MPENTIUMIII)	+= -march=i686 $(call tune,pentium3)
cflags-$(CONFIG_MPENTIUMM)	+= -march=i686 $(call tune,pentium3)
cflags-$(CONFIG_MPENTIUM4)	+= -march=i686 $(call tune,pentium4)
cflags-$(CONFIG_MK6)		+= -march=k6
# Please note, that patches that add -march=athlon-xp and friends are pointless.
# They make zero difference whatsosever to performance at this time.
cflags-$(CONFIG_MK7)		+= -march=athlon
cflags-$(CONFIG_MCRUSOE)	+= -march=i686 $(align)
cflags-$(CONFIG_MEFFICEON)	+= -march=i686 $(call tune,pentium3) $(align)
cflags-$(CONFIG_MCYRIXIII)	+= $(call cc-option,-march=c3,-march=i486) $(align)
cflags-$(CONFIG_MVIAC3_2)	+= $(call cc-option,-march=c3-2,-march=i686)
cflags-$(CONFIG_MVIAC7)		+= -march=i686
cflags-$(CONFIG_MATOM)		+= -march=atom

# Geode GX1 support
cflags-$(CONFIG_MGEODEGX1)	+= -march=pentium-mmx
cflags-$(CONFIG_MGEODE_LX)	+= $(call cc-option,-march=geode,-march=pentium-mmx)
# add at the end to overwrite eventual tuning options from earlier
# cpu entries
cflags-$(CONFIG_X86_GENERIC) 	+= $(call tune,generic,$(call tune,i686))

Annotation

Implementation Notes