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