1#ifndef FIO_ARCH_X86_COMMON
2#define FIO_ARCH_X86_COMMON
3
4#include <string.h>
5
6static inline void cpuid(unsigned int op,
7			 unsigned int *eax, unsigned int *ebx,
8			 unsigned int *ecx, unsigned int *edx)
9{
10	*eax = op;
11	*ecx = 0;
12	do_cpuid(eax, ebx, ecx, edx);
13}
14
15#define ARCH_HAVE_INIT
16
17extern int tsc_reliable;
18
19static inline int arch_init_intel(unsigned int level)
20{
21	unsigned int eax, ebx, ecx = 0, edx;
22
23	/*
24	 * Check for TSC
25	 */
26	eax = 1;
27	do_cpuid(&eax, &ebx, &ecx, &edx);
28	if (!(edx & (1U << 4)))
29		return 0;
30
31	/*
32	 * Check for constant rate and synced (across cores) TSC
33	 */
34	eax = 0x80000007;
35	do_cpuid(&eax, &ebx, &ecx, &edx);
36	return edx & (1U << 8);
37}
38
39static inline int arch_init_amd(unsigned int level)
40{
41	unsigned int eax, ebx, ecx, edx;
42
43	cpuid(0x80000000, &eax, &ebx, &ecx, &edx);
44	if (eax < 0x80000007)
45		return 0;
46
47	cpuid(0x80000007, &eax, &ebx, &ecx, &edx);
48	if (edx & (1 << 8))
49		return 1;
50
51	return 0;
52}
53
54static inline int arch_init(char *envp[])
55{
56	unsigned int level;
57	char str[13];
58
59	cpuid(0, &level, (unsigned int *) &str[0],
60			 (unsigned int *) &str[8],
61			 (unsigned int *) &str[4]);
62
63	str[12] = '\0';
64	if (!strcmp(str, "GenuineIntel"))
65		tsc_reliable = arch_init_intel(level);
66	else if (!strcmp(str, "AuthenticAMD"))
67		tsc_reliable = arch_init_amd(level);
68
69	return 0;
70}
71
72#endif
73