77 lines
1.4 KiB
C
77 lines
1.4 KiB
C
#ifndef FIO_ARCH_X86_COMMON
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#define FIO_ARCH_X86_COMMON
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#include <string.h>
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static inline void cpuid(unsigned int op,
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unsigned int *eax, unsigned int *ebx,
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unsigned int *ecx, unsigned int *edx)
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{
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*eax = op;
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*ecx = 0;
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do_cpuid(eax, ebx, ecx, edx);
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}
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#define ARCH_HAVE_INIT
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extern int tsc_reliable;
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extern int arch_random;
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static inline void arch_init_intel(unsigned int level)
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{
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unsigned int eax, ebx, ecx = 0, edx;
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/*
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* Check for TSC
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*/
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eax = 1;
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do_cpuid(&eax, &ebx, &ecx, &edx);
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if (!(edx & (1U << 4)))
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return;
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/*
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* Check for constant rate and synced (across cores) TSC
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*/
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eax = 0x80000007;
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do_cpuid(&eax, &ebx, &ecx, &edx);
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tsc_reliable = (edx & (1U << 8)) != 0;
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/*
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* Check for FDRAND
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*/
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eax = 0x1;
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do_cpuid(&eax, &ebx, &ecx, &edx);
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arch_random = (ecx & (1U << 30)) != 0;
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}
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static inline void arch_init_amd(unsigned int level)
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{
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unsigned int eax, ebx, ecx, edx;
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cpuid(0x80000000, &eax, &ebx, &ecx, &edx);
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if (eax < 0x80000007)
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return;
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cpuid(0x80000007, &eax, &ebx, &ecx, &edx);
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tsc_reliable = (edx & (1U << 8)) != 0;
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}
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static inline void arch_init(char *envp[])
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{
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unsigned int level;
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char str[13];
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arch_random = tsc_reliable = 0;
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cpuid(0, &level, (unsigned int *) &str[0],
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(unsigned int *) &str[8],
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(unsigned int *) &str[4]);
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str[12] = '\0';
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if (!strcmp(str, "GenuineIntel"))
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arch_init_intel(level);
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else if (!strcmp(str, "AuthenticAMD"))
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arch_init_amd(level);
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}
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#endif
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