diff options
Diffstat (limited to 'sys/amd64/include/cpufunc.h')
-rw-r--r-- | sys/amd64/include/cpufunc.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/sys/amd64/include/cpufunc.h b/sys/amd64/include/cpufunc.h index 927d00f..829efc1 100644 --- a/sys/amd64/include/cpufunc.h +++ b/sys/amd64/include/cpufunc.h @@ -418,6 +418,25 @@ rcr4(void) return (data); } +static __inline u_long +rxcr(u_int reg) +{ + u_int low, high; + + __asm __volatile("xgetbv" : "=a" (low), "=d" (high) : "c" (reg)); + return (low | ((uint64_t)high << 32)); +} + +static __inline void +load_xcr(u_int reg, u_long val) +{ + u_int low, high; + + low = val; + high = val >> 32; + __asm __volatile("xsetbv" : : "c" (reg), "a" (low), "d" (high)); +} + /* * Global TLB flush (except for thise for pages marked PG_G) */ |