115 lines
2.0 KiB
C
115 lines
2.0 KiB
C
/* i386 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 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 void cpuid(uint32_t op, uint32_t * eax, uint32_t * ebx,
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uint32_t * ecx, uint32_t * edx)
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{
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cpuid_count(op, 0, eax, ebx, ecx, edx);
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}
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static inline __constfunc uint32_t cpuid_eax(uint32_t level)
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{
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uint32_t v;
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asm volatile("pushl %%ebx ; "
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"cpuid ; "
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"popl %%ebx"
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: "=a" (v)
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: "a"(level)
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: "ecx", "edx");
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return v;
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}
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static inline __constfunc uint32_t cpuid_ebx(uint32_t level)
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{
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uint32_t v;
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asm volatile("movl %%ebx,%0 ; "
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"cpuid ; "
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"xchgl %0,%%ebx"
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: "=SD" (v), "+a" (level)
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: : "ecx", "edx");
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return v;
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}
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static inline __constfunc uint32_t cpuid_ecx(uint32_t level)
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{
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uint32_t v;
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asm volatile("pushl %%ebx ; "
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"cpuid ; "
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"popl %%ebx"
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: "=c" (v), "+a" (level)
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: : "edx");
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return v;
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}
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static inline __constfunc uint32_t cpuid_edx(uint32_t level)
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{
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uint32_t v;
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asm volatile("pushl %%ebx ; "
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"cpuid ; "
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"popl %%ebx"
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: "=d" (v), "+a" (level)
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: : "ecx");
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return v;
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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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