| #ifndef _CPU_X86_64_H |
| #define _CPU_X86_64_H |
| |
| /* x86_64 cpu.h */ |
| |
| static inline uint64_t rdtsc(void) |
| { |
| uint64_t v; |
| asm volatile("rdtsc" : "=A" (v)); |
| return v; |
| } |
| |
| static inline uint32_t rdtscl(void) |
| { |
| uint32_t v; |
| asm volatile("rdtsc" : "=a" (v) : : "edx"); |
| return v; |
| } |
| |
| static inline void native_cpuid(unsigned int *eax, unsigned int *ebx, |
| unsigned int *ecx, unsigned int *edx) |
| { |
| /* ecx is often an input as well as an output. */ |
| asm volatile("cpuid" |
| : "=a" (*eax), |
| "=b" (*ebx), |
| "=c" (*ecx), |
| "=d" (*edx) |
| : "0" (*eax), "2" (*ecx) |
| : "memory"); |
| } |
| /* |
| * Generic CPUID function |
| * clear %ecx since some cpus (Cyrix MII) do not set or clear %ecx |
| * resulting in stale register contents being returned. |
| */ |
| static inline void cpuid(uint32_t op, |
| uint32_t *eax, uint32_t *ebx, |
| uint32_t *ecx, uint32_t *edx) |
| { |
| *eax = op; |
| *ecx = 0; |
| native_cpuid(eax, ebx, ecx, edx); |
| } |
| |
| /* |
| * CPUID functions returning a single datum |
| */ |
| static inline uint32_t cpuid_eax(uint32_t op) |
| { |
| uint32_t eax, ebx, ecx, edx; |
| |
| cpuid(op, &eax, &ebx, &ecx, &edx); |
| |
| return eax; |
| } |
| |
| static inline uint32_t cpuid_ebx(uint32_t op) |
| { |
| uint32_t eax, ebx, ecx, edx; |
| |
| cpuid(op, &eax, &ebx, &ecx, &edx); |
| |
| return ebx; |
| } |
| |
| static inline uint32_t cpuid_ecx(uint32_t op) |
| { |
| uint32_t eax, ebx, ecx, edx; |
| |
| cpuid(op, &eax, &ebx, &ecx, &edx); |
| |
| return ecx; |
| } |
| |
| static inline uint32_t cpuid_edx(uint32_t op) |
| { |
| uint32_t eax, ebx, ecx, edx; |
| |
| cpuid(op, &eax, &ebx, &ecx, &edx); |
| |
| return edx; |
| } |
| |
| static inline void cpuid_count(uint32_t op, uint32_t cnt, |
| uint32_t * eax, uint32_t * ebx, |
| uint32_t * ecx, uint32_t * edx) |
| { |
| asm volatile("movl %%ebx,%1 ; " |
| "cpuid ; " |
| "xchgl %1,%%ebx" |
| : "=a" (*eax), "=SD" (*ebx), "=c" (*ecx), "=d" (*edx) |
| : "a"(op), "c"(cnt)); |
| } |
| |
| static inline uint64_t rdmsr(uint32_t msr) |
| { |
| uint64_t v; |
| |
| asm volatile("rdmsr" : "=A" (v) : "c"(msr)); |
| return v; |
| } |
| |
| static inline void wrmsr(uint64_t v, uint32_t msr) |
| { |
| asm volatile("wrmsr" : : "A" (v), "c" (msr)); |
| } |
| |
| static inline void cpu_relax(void) |
| { |
| asm volatile("rep ; nop" : : : "memory"); |
| } |
| |
| static inline void hlt(void) |
| { |
| asm volatile("hlt" : : : "memory"); |
| } |
| |
| static inline void cli(void) |
| { |
| asm volatile("cli" : : : "memory"); |
| } |
| |
| static inline void sti(void) |
| { |
| asm volatile("sti" : : : "memory"); |
| } |
| #endif |