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