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[S390] Add config option for z196 code generation.

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Add a kernel config option for the IBM zEnterprise 196. This will
produce faster code on newer compilers using the -march=z196 option.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2010-10-25 16:10:17 +02:00 committed by Martin Schwidefsky
parent 7aca2eda5c
commit f861e40572
3 changed files with 15 additions and 2 deletions
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8
arch/s390/Kconfig
View file

@ -287,6 +287,14 @@ config MARCH_Z10
machines such as the z990, z890, z900, z800, z9-109, z9-ec machines such as the z990, z890, z900, z800, z9-109, z9-ec
and z9-bc. and z9-bc.
config MARCH_Z196
bool "IBM zEnterprise 196"
help
Select this to enable optimizations for IBM zEnterprise 196.
The kernel will be slightly faster but will not work on older
machines such as the z990, z890, z900, z800, z9-109, z9-ec,
z9-bc, z10-ec and z10-bc.
endchoice endchoice
config PACK_STACK config PACK_STACK

1
arch/s390/Makefile
View file

@ -40,6 +40,7 @@ cflags-$(CONFIG_MARCH_Z900) += $(call cc-option,-march=z900)
cflags-$(CONFIG_MARCH_Z990) += $(call cc-option,-march=z990) cflags-$(CONFIG_MARCH_Z990) += $(call cc-option,-march=z990)
cflags-$(CONFIG_MARCH_Z9_109) += $(call cc-option,-march=z9-109) cflags-$(CONFIG_MARCH_Z9_109) += $(call cc-option,-march=z9-109)
cflags-$(CONFIG_MARCH_Z10) += $(call cc-option,-march=z10) cflags-$(CONFIG_MARCH_Z10) += $(call cc-option,-march=z10)
cflags-$(CONFIG_MARCH_Z196) += $(call cc-option,-march=z196)
#KBUILD_IMAGE is necessary for make rpm #KBUILD_IMAGE is necessary for make rpm
KBUILD_IMAGE :=arch/s390/boot/image KBUILD_IMAGE :=arch/s390/boot/image

8
arch/s390/kernel/head.S
View file

@ -488,7 +488,9 @@ startup:
.align 16 .align 16
2: .long 0x000a0000,0x8badcccc 2: .long 0x000a0000,0x8badcccc
#if defined(CONFIG_64BIT) #if defined(CONFIG_64BIT)
#if defined(CONFIG_MARCH_Z10) #if defined(CONFIG_MARCH_Z196)
.long 0xc100efe3, 0xf46c0000
#elif defined(CONFIG_MARCH_Z10)
.long 0xc100efe3, 0xf0680000 .long 0xc100efe3, 0xf0680000
#elif defined(CONFIG_MARCH_Z9_109) #elif defined(CONFIG_MARCH_Z9_109)
.long 0xc100efc3, 0x00000000 .long 0xc100efc3, 0x00000000
@ -498,7 +500,9 @@ startup:
.long 0xc0000000, 0x00000000 .long 0xc0000000, 0x00000000
#endif #endif
#else #else
#if defined(CONFIG_MARCH_Z10) #if defined(CONFIG_MARCH_Z196)
.long 0x8100c880, 0x00000000
#elif defined(CONFIG_MARCH_Z10)
.long 0x8100c880, 0x00000000 .long 0x8100c880, 0x00000000
#elif defined(CONFIG_MARCH_Z9_109) #elif defined(CONFIG_MARCH_Z9_109)
.long 0x8100c880, 0x00000000 .long 0x8100c880, 0x00000000