[S390] Add config option for z196 code generation.
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>
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 7afc173..21a7030 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -287,6 +287,14 @@
machines such as the z990, z890, z900, z800, z9-109, z9-ec
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
config PACK_STACK
diff --git a/arch/s390/Makefile b/arch/s390/Makefile
index 9d31847..d5b8a6a 100644
--- a/arch/s390/Makefile
+++ b/arch/s390/Makefile
@@ -40,6 +40,7 @@
cflags-$(CONFIG_MARCH_Z990) += $(call cc-option,-march=z990)
cflags-$(CONFIG_MARCH_Z9_109) += $(call cc-option,-march=z9-109)
cflags-$(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 :=arch/s390/boot/image
diff --git a/arch/s390/kernel/head.S b/arch/s390/kernel/head.S
index db1696e..7061398 100644
--- a/arch/s390/kernel/head.S
+++ b/arch/s390/kernel/head.S
@@ -488,7 +488,9 @@
.align 16
2: .long 0x000a0000,0x8badcccc
#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
#elif defined(CONFIG_MARCH_Z9_109)
.long 0xc100efc3, 0x00000000
@@ -498,7 +500,9 @@
.long 0xc0000000, 0x00000000
#endif
#else
-#if defined(CONFIG_MARCH_Z10)
+#if defined(CONFIG_MARCH_Z196)
+ .long 0x8100c880, 0x00000000
+#elif defined(CONFIG_MARCH_Z10)
.long 0x8100c880, 0x00000000
#elif defined(CONFIG_MARCH_Z9_109)
.long 0x8100c880, 0x00000000
