#ifndef FIO_ARCH_X86_COMMON
#define FIO_ARCH_X86_COMMON
-static inline void do_cpuid(unsigned int *eax, unsigned int *ebx,
- unsigned int *ecx, unsigned int *edx)
+#include <string.h>
+
+static inline void cpuid(unsigned int op,
+ unsigned int *eax, unsigned int *ebx,
+ unsigned int *ecx, unsigned int *edx)
{
- asm volatile("cpuid"
- : "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=d" (*edx)
- : "0" (*eax), "2" (*ecx)
- : "memory");
+ *eax = op;
+ *ecx = 0;
+ do_cpuid(eax, ebx, ecx, edx);
}
#define ARCH_HAVE_INIT
+
extern int tsc_reliable;
-static inline int arch_init(char *envp[])
+
+static inline int arch_init_intel(unsigned int level)
{
unsigned int eax, ebx, ecx = 0, edx;
*/
eax = 0x80000007;
do_cpuid(&eax, &ebx, &ecx, &edx);
- tsc_reliable = edx & (1U << 8);
+ return edx & (1U << 8);
+}
+
+static inline int arch_init_amd(unsigned int level)
+{
+ unsigned int eax, ebx, ecx, edx;
+
+ cpuid(0x80000000, &eax, &ebx, &ecx, &edx);
+ if (eax < 0x80000007)
+ return 0;
+
+ cpuid(0x80000007, &eax, &ebx, &ecx, &edx);
+ if (edx & (1 << 8))
+ return 1;
+
+ return 0;
+}
+
+static inline int arch_init(char *envp[])
+{
+ unsigned int level;
+ char str[13];
+
+ cpuid(0, &level, (unsigned int *) &str[0],
+ (unsigned int *) &str[8],
+ (unsigned int *) &str[4]);
+
+ str[12] = '\0';
+ if (!strcmp(str, "GenuineIntel"))
+ tsc_reliable = arch_init_intel(level);
+ else if (!strcmp(str, "AuthenticAMD"))
+ tsc_reliable = arch_init_amd(level);
+
return 0;
}