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x86: Add functions to set and clear bits on MSRs

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Since we do these sorts of operations a lot, it is useful to have a simpler
API, similar to clrsetbits_le32().

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2015-04-29 22:26:00 -06:00
parent 45b5a37836
commit 86196c65ac
1 changed files with 28 additions and 0 deletions
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28
arch/x86/include/asm/msr.h
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@ -128,6 +128,34 @@ static inline void wrmsr(unsigned msr, unsigned low, unsigned high)
#define wrmsrl(msr, val) \
native_write_msr((msr), (u32)((u64)(val)), (u32)((u64)(val) >> 32))
static inline void msr_clrsetbits_64(unsigned msr, u64 clear, u64 set)
{
u64 val;
val = native_read_msr(msr);
val &= ~clear;
val |= set;
wrmsrl(msr, val);
}
static inline void msr_setbits_64(unsigned msr, u64 set)
{
u64 val;
val = native_read_msr(msr);
val |= set;
wrmsrl(msr, val);
}
static inline void msr_clrbits_64(unsigned msr, u64 clear)
{
u64 val;
val = native_read_msr(msr);
val &= ~clear;
wrmsrl(msr, val);
}
/* rdmsr with exception handling */
#define rdmsr_safe(msr, p1, p2) \
({ \