diff options
Diffstat (limited to 'src/include/cpu/x86')
| -rw-r--r-- | src/include/cpu/x86/msr.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/src/include/cpu/x86/msr.h b/src/include/cpu/x86/msr.h index 8c558ce8ac..2710e7f1fc 100644 --- a/src/include/cpu/x86/msr.h +++ b/src/include/cpu/x86/msr.h @@ -301,5 +301,25 @@ static inline enum mca_err_code_types mca_err_type(msr_t reg) return MCA_ERRTYPE_UNKNOWN; } + +/* Helper for setting single MSR bits */ +static inline void msr_set_bit(unsigned int reg, unsigned int bit) +{ + msr_t msr = rdmsr(reg); + + if (bit < 32) { + if (msr.lo & (1 << bit)) + return; + msr.lo |= 1 << bit; + } else { + if (msr.hi & (1 << (bit - 32))) + return; + msr.hi |= 1 << (bit - 32); + } + + wrmsr(reg, msr); +} + + #endif /* __ASSEMBLER__ */ #endif /* CPU_X86_MSR_H */ |