71 lines
1.5 KiB
C
71 lines
1.5 KiB
C
#ifndef ARCH_X86_64_H
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#define ARCH_X86_64_H
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static inline void do_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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asm volatile("cpuid"
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: "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=d" (*edx)
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: "0" (*eax), "2" (*ecx)
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: "memory");
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}
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#include "arch-x86-common.h"
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#define FIO_ARCH (arch_x86_64)
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#define FIO_HUGE_PAGE 2097152
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#define nop __asm__ __volatile__("rep;nop": : :"memory")
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#define read_barrier() __asm__ __volatile__("lfence":::"memory")
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#define write_barrier() __asm__ __volatile__("sfence":::"memory")
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static inline unsigned long arch_ffz(unsigned long bitmask)
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{
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__asm__("bsf %1,%0" :"=r" (bitmask) :"r" (~bitmask));
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return bitmask;
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}
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static inline unsigned long long get_cpu_clock(void)
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{
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unsigned int lo, hi;
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__asm__ __volatile__("rdtsc" : "=a" (lo), "=d" (hi));
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return ((unsigned long long) hi << 32ULL) | lo;
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}
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#define ARCH_HAVE_FFZ
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#define ARCH_HAVE_SSE4_2
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#define ARCH_HAVE_CPU_CLOCK
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#define RDRAND_LONG ".byte 0x48,0x0f,0xc7,0xf0"
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#define RDSEED_LONG ".byte 0x48,0x0f,0xc7,0xf8"
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#define RDRAND_RETRY 100
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static inline int arch_rand_long(unsigned long *val)
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{
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int ok;
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asm volatile("1: " RDRAND_LONG "\n\t"
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"jc 2f\n\t"
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"decl %0\n\t"
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"jnz 1b\n\t"
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"2:"
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: "=r" (ok), "=a" (*val)
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: "0" (RDRAND_RETRY));
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return ok;
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}
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static inline int arch_rand_seed(unsigned long *seed)
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{
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unsigned char ok;
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asm volatile(RDSEED_LONG "\n\t"
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"setc %0"
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: "=qm" (ok), "=a" (*seed));
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return 0;
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}
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#endif
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