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x86: re-add rdmsrl_safe

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RDMSR for 64bit values with exception handling.

Makes it easier to deal with 64bit valued MSRs. The old 64bit code
base had that too as checking_rdmsrl(), but it got dropped somehow.

Signed-off-by: Andi Kleen <andi@firstfloor.org>
Cc: andreas.herrmann3@amd.com
Cc: mingo@elte.hu
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Andi Kleen 2008-03-22 10:59:28 +01:00 committed by Ingo Molnar
parent f5c24a7fd0
commit 1de87bd40e
2 changed files with 15 additions and 0 deletions
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8
include/asm-x86/msr.h
View File

@ -150,6 +150,14 @@ static inline int wrmsr_safe(unsigned msr, unsigned low, unsigned high)
__err; \
})
static inline int rdmsrl_safe(unsigned msr, unsigned long long *p)
{
int err;
*p = native_read_msr_safe(msr, &err);
return err;
}
#define rdtscl(low) \
((low) = (u32)native_read_tsc())

7
include/asm-x86/paravirt.h
View File

@ -693,6 +693,13 @@ do { \
_err; \
})
static inline int rdmsrl_safe(unsigned msr, unsigned long long *p)
{
int err;
*p = paravirt_read_msr(msr, &err);
return err;
}
static inline u64 paravirt_read_tsc(void)
{