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i386: msr.h: be paranoid about types and parentheses

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When implementing things as macros, make sure we use typecasts and
parentheses where needed.  The macros as defined were vulnerable to
surreptitious promotion causing problems.

Avoid macros where practical; e.g. wrmsr() can be an inline instead.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
H. Peter Anvin 2007-05-09 00:02:11 -07:00 committed by Linus Torvalds
parent 29bd443377
commit b0b73cb41d
1 changed files with 22 additions and 27 deletions
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49
include/asm-i386/msr.h
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@ -86,55 +86,50 @@ static inline unsigned long long native_read_pmc(void)
#define rdmsr(msr,val1,val2) \
do { \
unsigned long long __val = native_read_msr(msr); \
val1 = __val; \
val2 = __val >> 32; \
u64 __val = native_read_msr(msr); \
(val1) = (u32)__val; \
(val2) = (u32)(__val >> 32); \
} while(0)
#define wrmsr(msr,val1,val2) \
native_write_msr(msr, ((unsigned long long)val2 << 32) | val1)
#define rdmsrl(msr,val) \
do { \
(val) = native_read_msr(msr); \
} while(0)
static inline void wrmsrl (unsigned long msr, unsigned long long val)
static inline void wrmsr(u32 __msr, u32 __low, u32 __high)
{
unsigned long lo, hi;
lo = (unsigned long) val;
hi = val >> 32;
wrmsr (msr, lo, hi);
native_write_msr(__msr, ((u64)__high << 32) | __low);
}
#define rdmsrl(msr,val) \
((val) = native_read_msr(msr))
#define wrmsrl(msr,val) native_write_msr(msr, val)
/* wrmsr with exception handling */
#define wrmsr_safe(msr,val1,val2) \
(native_write_msr_safe(msr, ((unsigned long long)val2 << 32) | val1))
static inline int wrmsr_safe(u32 __msr, u32 __low, u32 __high)
{
return native_write_msr_safe(__msr, ((u64)__high << 32) | __low);
}
/* rdmsr with exception handling */
#define rdmsr_safe(msr,p1,p2) \
({ \
int __err; \
unsigned long long __val = native_read_msr_safe(msr, &__err);\
(*p1) = __val; \
(*p2) = __val >> 32; \
u64 __val = native_read_msr_safe(msr, &__err); \
(*p1) = (u32)__val; \
(*p2) = (u32)(__val >> 32); \
__err; \
})
#define rdtscl(low) \
do { \
(low) = native_read_tsc(); \
} while(0)
((low) = (u32)native_read_tsc())
#define rdtscll(val) ((val) = native_read_tsc())
#define rdtscll(val) \
((val) = native_read_tsc())
#define write_tsc(val1,val2) wrmsr(0x10, val1, val2)
#define rdpmc(counter,low,high) \
do { \
u64 _l = native_read_pmc(); \
low = (u32)_l; \
high = _l >> 32; \
(low) = (u32)_l; \
(high) = (u32)(_l >> 32); \
} while(0)
#endif /* !CONFIG_PARAVIRT */