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[PATCH] i386: Add an option for the VIA C7 which sets appropriate L1 …
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The VIA C7 is a 686 (with TSC) that supports MMX, SSE and SSE2, it also has
a cache line length of 64 according to
http://www.digit-life.com/articles2/cpu/rmma-via-c7.html.  This patch sets
gcc to -march=686 and select s the correct cache shift.

Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Andi Kleen <ak@suse.de>
Cc: Dave Jones <davej@codemonkey.org.uk>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Simon Arlott authored and Andi Kleen committed May 2, 2007
1 parent f5e8861 commit 0949be3
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Showing 4 changed files with 14 additions and 3 deletions.
13 changes: 10 additions & 3 deletions arch/i386/Kconfig.cpu
Original file line number Diff line number Diff line change
Expand Up @@ -43,6 +43,7 @@ config M386
- "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.

If you don't know what to do, choose "386".

Expand Down Expand Up @@ -203,6 +204,12 @@ config MVIAC3_2
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"
help
Select this for a VIA C7. Selecting this uses the correct cache
shift and tells gcc to treat the CPU as a 686.

endchoice

config X86_GENERIC
Expand Down Expand Up @@ -231,7 +238,7 @@ config X86_L1_CACHE_SHIFT
default "7" if MPENTIUM4 || X86_GENERIC
default "4" if X86_ELAN || M486 || M386 || MGEODEGX1
default "5" if MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCRUSOE || MEFFICEON || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2 || MGEODE_LX
default "6" if MK7 || MK8 || MPENTIUMM || MCORE2
default "6" if MK7 || MK8 || MPENTIUMM || MCORE2 || MVIAC7

config RWSEM_GENERIC_SPINLOCK
bool
Expand Down Expand Up @@ -297,7 +304,7 @@ config X86_ALIGNMENT_16

config X86_GOOD_APIC
bool
depends on MK7 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || MK8 || MEFFICEON || MCORE2
depends on MK7 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || MK8 || MEFFICEON || MCORE2 || MVIAC7
default y

config X86_INTEL_USERCOPY
Expand All @@ -322,5 +329,5 @@ config X86_OOSTORE

config X86_TSC
bool
depends on (MWINCHIP3D || MWINCHIP2 || MCRUSOE || MEFFICEON || MCYRIXIII || MK7 || MK6 || MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || MK8 || MVIAC3_2 || MGEODEGX1 || MGEODE_LX || MCORE2) && !X86_NUMAQ
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
default y
1 change: 1 addition & 0 deletions arch/i386/Makefile.cpu
Original file line number Diff line number Diff line change
Expand Up @@ -32,6 +32,7 @@ cflags-$(CONFIG_MWINCHIP2) += $(call cc-option,-march=winchip2,-march=i586)
cflags-$(CONFIG_MWINCHIP3D) += $(call cc-option,-march=winchip2,-march=i586)
cflags-$(CONFIG_MCYRIXIII) += $(call cc-option,-march=c3,-march=i486) $(align)-functions=0 $(align)-jumps=0 $(align)-loops=0
cflags-$(CONFIG_MVIAC3_2) += $(call cc-option,-march=c3-2,-march=i686)
cflags-$(CONFIG_MVIAC7) += -march=i686
cflags-$(CONFIG_MCORE2) += -march=i686 $(call cc-option,-mtune=core2,$(call cc-option,-mtune=generic,-mtune=i686))

# AMD Elan support
Expand Down
1 change: 1 addition & 0 deletions arch/um/defconfig
Original file line number Diff line number Diff line change
Expand Up @@ -41,6 +41,7 @@ CONFIG_M686=y
# CONFIG_MGEODE_LX is not set
# CONFIG_MCYRIXIII is not set
# CONFIG_MVIAC3_2 is not set
# CONFIG_MVIAC7 is not set
# CONFIG_X86_GENERIC is not set
CONFIG_X86_CMPXCHG=y
CONFIG_X86_XADD=y
Expand Down
2 changes: 2 additions & 0 deletions include/asm-i386/module.h
Original file line number Diff line number Diff line change
Expand Up @@ -54,6 +54,8 @@ struct mod_arch_specific
#define MODULE_PROC_FAMILY "CYRIXIII "
#elif defined CONFIG_MVIAC3_2
#define MODULE_PROC_FAMILY "VIAC3-2 "
#elif defined CONFIG_MVIAC7
#define MODULE_PROC_FAMILY "VIAC7 "
#elif defined CONFIG_MGEODEGX1
#define MODULE_PROC_FAMILY "GEODEGX1 "
#elif defined CONFIG_MGEODE_LX
Expand Down

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