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include/cpu/msr.h: transform into an union

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This makes it easier to get the content of an msr into a full 64bit
variable.

Change-Id: I1b026cd3807fd68d805051a74b3d31fcde1c5626
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68572
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
This commit is contained in:
Arthur Heymans
2022-10-19 20:06:42 +02:00
parent 0c9fa6f2ce
commit 407e00dca0
4 changed files with 26 additions and 36 deletions
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13
src/include/cpu/x86/msr.h
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@@ -285,7 +285,7 @@ static inline enum mca_err_code_types mca_err_type(msr_t reg)
static inline uint64_t msr_read(unsigned int reg)
{
msr_t msr = rdmsr(reg);
return (((uint64_t)msr.hi << 32) | msr.lo);
return msr.raw;
}
/**
@@ -296,10 +296,7 @@ static inline uint64_t msr_read(unsigned int reg)
*/
static inline void msr_write(unsigned int reg, uint64_t value)
{
msr_t msr = {
.lo = (unsigned int)value,
.hi = (unsigned int)(value >> 32)
};
msr_t msr = { .raw = value };
wrmsr(reg, msr);
}
@@ -315,10 +312,8 @@ static inline void msr_unset_and_set(unsigned int reg, uint64_t unset, uint64_t
msr_t msr;
msr = rdmsr(reg);
msr.lo &= (unsigned int)~unset;
msr.hi &= (unsigned int)~(unset >> 32);
msr.lo |= (unsigned int)set;
msr.hi |= (unsigned int)(set >> 32);
msr.raw &= ~unset;
msr.raw |= set;
wrmsr(reg, msr);
}

10
src/include/cpu/x86/msr_access.h
View File

@@ -6,10 +6,14 @@
#ifndef __ASSEMBLER__
#include <types.h>
typedef struct msr_struct {
unsigned int lo;
unsigned int hi;
typedef union msr_union {
struct {
unsigned int lo;
unsigned int hi;
};
uint64_t raw;
} msr_t;
_Static_assert(sizeof(msr_t) == sizeof(uint64_t), "Incorrect size for msr_t");
#if CONFIG(SOC_SETS_MSRS)
msr_t soc_msr_read(unsigned int index);