diff options
Diffstat (limited to 'xen/include/asm-x86/msr.h')
| -rw-r--r-- | xen/include/asm-x86/msr.h | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/xen/include/asm-x86/msr.h b/xen/include/asm-x86/msr.h index 06c46a8bd2..5277c2b6fb 100644 --- a/xen/include/asm-x86/msr.h +++ b/xen/include/asm-x86/msr.h @@ -9,6 +9,7 @@ #include <xen/percpu.h> #include <xen/errno.h> #include <asm/asm_defns.h> +#include <asm/cpufeature.h> #define rdmsr(msr,val1,val2) \ __asm__ __volatile__("rdmsr" \ @@ -97,6 +98,61 @@ static inline int wrmsr_safe(unsigned int msr, uint64_t val) : "=a" (low), "=d" (high) \ : "c" (counter)) +static inline unsigned long rdfsbase(void) +{ + unsigned long base; + + if ( cpu_has_fsgsbase ) +#ifdef HAVE_GAS_FSGSBASE + asm volatile ( "rdfsbase %0" : "=r" (base) ); +#else + asm volatile ( ".byte 0xf3, 0x48, 0x0f, 0xae, 0xc0" : "=a" (base) ); +#endif + else + rdmsrl(MSR_FS_BASE, base); + + return base; +} + +static inline unsigned long rdgsbase(void) +{ + unsigned long base; + + if ( cpu_has_fsgsbase ) +#ifdef HAVE_GAS_FSGSBASE + asm volatile ( "rdgsbase %0" : "=r" (base) ); +#else + asm volatile ( ".byte 0xf3, 0x48, 0x0f, 0xae, 0xc8" : "=a" (base) ); +#endif + else + rdmsrl(MSR_GS_BASE, base); + + return base; +} + +static inline void wrfsbase(unsigned long base) +{ + if ( cpu_has_fsgsbase ) +#ifdef HAVE_GAS_FSGSBASE + asm volatile ( "wrfsbase %0" :: "r" (base) ); +#else + asm volatile ( ".byte 0xf3, 0x48, 0x0f, 0xae, 0xd0" :: "a" (base) ); +#endif + else + wrmsrl(MSR_FS_BASE, base); +} + +static inline void wrgsbase(unsigned long base) +{ + if ( cpu_has_fsgsbase ) +#ifdef HAVE_GAS_FSGSBASE + asm volatile ( "wrgsbase %0" :: "r" (base) ); +#else + asm volatile ( ".byte 0xf3, 0x48, 0x0f, 0xae, 0xd8" :: "a" (base) ); +#endif + else + wrmsrl(MSR_GS_BASE, base); +} DECLARE_PER_CPU(u64, efer); u64 read_efer(void); |