diff options
Diffstat (limited to 'src/include/cpu/x86')
| -rw-r--r-- | src/include/cpu/x86/cache.h | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/src/include/cpu/x86/cache.h b/src/include/cpu/x86/cache.h index f3ac2ed11f..14538592e9 100644 --- a/src/include/cpu/x86/cache.h +++ b/src/include/cpu/x86/cache.h @@ -20,16 +20,19 @@ #ifndef CPU_X86_CACHE #define CPU_X86_CACHE +/* the memory clobber prevents the GCC from reordering the read/write order + of CR0 */ + static inline unsigned long read_cr0(void) { unsigned long cr0; - asm volatile ("movl %%cr0, %0" : "=r" (cr0)); + asm volatile ("movl %%cr0, %0" : "=r" (cr0) :: "memory"); return cr0; } static inline void write_cr0(unsigned long cr0) { - asm volatile ("movl %0, %%cr0" : : "r" (cr0)); + asm volatile ("movl %0, %%cr0" : : "r" (cr0) : "memory"); } static inline void invd(void) @@ -39,7 +42,7 @@ static inline void invd(void) static inline void wbinvd(void) { - asm volatile ("wbinvd"); + asm volatile ("wbinvd" ::: "memory"); } static inline void enable_cache(void) |