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authorHeiko Carstens <heiko.carstens@de.ibm.com>2008-04-30 15:38:45 +0400
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2008-04-30 15:38:47 +0400
commit2e5061e40af88070984e3769eafb5a06022375fd (patch)
tree2964cc88a68f826fc8e025d145f692e1e78740e0 /include/asm-s390/system.h
parent8fc63658681f32e6e29f6d1138de933d7272e0ec (diff)
downloadlinux-2e5061e40af88070984e3769eafb5a06022375fd.tar.xz
[S390] Convert machine feature detection code to C.
From: Heiko Carstens <heiko.carstens@de.ibm.com> From: Carsten Otte <cotte@de.ibm.com> This lets us use defines for the magic bits in machine flags instead of using plain numbers all over the place. In addition on newer machines features/facilities are indicated by the result of the stfl instruction. So we use these bits instead of trying to execute new instructions and check wether we get an exception or not. Also the mvpg instruction is always available when in zArch mode, whereas the idte instruction is only available in zArch mode. This results in some minor optimizations. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Carsten Otte <cotte@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'include/asm-s390/system.h')
-rw-r--r--include/asm-s390/system.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/asm-s390/system.h b/include/asm-s390/system.h
index 79bdbf4b33a7..c819ae25a842 100644
--- a/include/asm-s390/system.h
+++ b/include/asm-s390/system.h
@@ -432,6 +432,14 @@ static inline unsigned int stfl(void)
return S390_lowcore.stfl_fac_list;
}
+static inline unsigned short stap(void)
+{
+ unsigned short cpu_address;
+
+ asm volatile("stap %0" : "=m" (cpu_address));
+ return cpu_address;
+}
+
extern void (*_machine_restart)(char *command);
extern void (*_machine_halt)(void);
extern void (*_machine_power_off)(void);