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authorGlauber de Oliveira Costa <gcosta@redhat.com>2008-01-30 13:31:07 +0100
committerIngo Molnar <mingo@elte.hu>2008-01-30 13:31:07 +0100
commitc9dcda5ce46c395c5c99003e259e1973dface640 (patch)
treeaec2a6b41de18d2313c2d620c077835d24222480 /include
parentb8d1fae7dbde6a1227fa142acecb48dc3dd63817 (diff)
x86: change write msr functions interface
This patche changes the native_write_msr() and friends interface to explicitly take 2 32-bit registers instead of a 64-bit value. The change will ease the merge with 64-bit code. As the 64-bit value will be passed as two registers anyway in i386, the PVOP_CALL interface has to account for that and use low/high parameters It would force the x86_64 version to be different. The change does not make i386 generated code less efficient. As said above, it would get the values from two registers anyway. Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include')
-rw-r--r--include/asm-x86/msr.h19
-rw-r--r--include/asm-x86/paravirt.h2
2 files changed, 11 insertions, 10 deletions
diff --git a/include/asm-x86/msr.h b/include/asm-x86/msr.h
index effb7319c0a..cb722235889 100644
--- a/include/asm-x86/msr.h
+++ b/include/asm-x86/msr.h
@@ -63,13 +63,14 @@ static inline unsigned long long native_read_msr_safe(unsigned int msr,
return val;
}
-static inline void native_write_msr(unsigned int msr, unsigned long long val)
+static inline void native_write_msr(unsigned int msr,
+ unsigned low, unsigned high)
{
- asm volatile("wrmsr" : : "c" (msr), "A"(val));
+ asm volatile("wrmsr" : : "c" (msr), "a"(low), "d" (high));
}
static inline int native_write_msr_safe(unsigned int msr,
- unsigned long long val)
+ unsigned low, unsigned high)
{
int err;
asm volatile("2: wrmsr ; xorl %0,%0\n"
@@ -82,7 +83,7 @@ static inline int native_write_msr_safe(unsigned int msr,
" .long 2b,3b\n\t"
".previous"
: "=a" (err)
- : "c" (msr), "0" ((u32)val), "d" ((u32)(val>>32)),
+ : "c" (msr), "0" (low), "d" (high),
"i" (-EFAULT));
return err;
}
@@ -118,20 +119,20 @@ static inline unsigned long long native_read_pmc(int counter)
(val2) = (u32)(__val >> 32); \
} while(0)
-static inline void wrmsr(u32 __msr, u32 __low, u32 __high)
+static inline void wrmsr(unsigned msr, unsigned low, unsigned high)
{
- native_write_msr(__msr, ((u64)__high << 32) | __low);
+ native_write_msr(msr, low, high);
}
#define rdmsrl(msr,val) \
((val) = native_read_msr(msr))
-#define wrmsrl(msr,val) native_write_msr(msr, val)
+#define wrmsrl(msr, val) native_write_msr(msr, (u32)val, (u32)(val >> 32))
/* wrmsr with exception handling */
-static inline int wrmsr_safe(u32 __msr, u32 __low, u32 __high)
+static inline int wrmsr_safe(unsigned msr, unsigned low, unsigned high)
{
- return native_write_msr_safe(__msr, ((u64)__high << 32) | __low);
+ return native_write_msr_safe(msr, low, high);
}
/* rdmsr with exception handling */
diff --git a/include/asm-x86/paravirt.h b/include/asm-x86/paravirt.h
index 4782be68d0f..e95c2a65516 100644
--- a/include/asm-x86/paravirt.h
+++ b/include/asm-x86/paravirt.h
@@ -115,7 +115,7 @@ struct pv_cpu_ops {
/* MSR, PMC and TSR operations.
err = 0/-EFAULT. wrmsr returns 0/-EFAULT. */
u64 (*read_msr)(unsigned int msr, int *err);
- int (*write_msr)(unsigned int msr, u64 val);
+ int (*write_msr)(unsigned int msr, unsigned low, unsigned high);
u64 (*read_tsc)(void);
u64 (*read_pmc)(int counter);