arch-ppc.h: Add ilog2 implementation for ppc64
[fio.git] / arch / arch-x86-common.h
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1#ifndef FIO_ARCH_X86_COMMON
2#define FIO_ARCH_X86_COMMON
3
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4#include <string.h>
5
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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
fa80feae 15#define ARCH_HAVE_INIT
7189c969 16
fa80feae 17extern int tsc_reliable;
16dc0710 18extern int arch_random;
7189c969 19
16dc0710 20static inline void arch_init_intel(unsigned int level)
fa80feae 21{
267339ff 22 unsigned int eax, ebx, ecx = 0, edx;
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23
24 /*
25 * Check for TSC
26 */
27 eax = 1;
28 do_cpuid(&eax, &ebx, &ecx, &edx);
29 if (!(edx & (1U << 4)))
16dc0710 30 return;
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31
32 /*
33 * Check for constant rate and synced (across cores) TSC
34 */
35 eax = 0x80000007;
36 do_cpuid(&eax, &ebx, &ecx, &edx);
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37 tsc_reliable = (edx & (1U << 8)) != 0;
38
39 /*
40 * Check for FDRAND
41 */
42 eax = 0x1;
43 do_cpuid(&eax, &ebx, &ecx, &edx);
44 arch_random = (ecx & (1U << 30)) != 0;
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45}
46
16dc0710 47static inline void arch_init_amd(unsigned int level)
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48{
49 unsigned int eax, ebx, ecx, edx;
50
51 cpuid(0x80000000, &eax, &ebx, &ecx, &edx);
52 if (eax < 0x80000007)
16dc0710 53 return;
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54
55 cpuid(0x80000007, &eax, &ebx, &ecx, &edx);
16dc0710 56 tsc_reliable = (edx & (1U << 8)) != 0;
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57}
58
16dc0710 59static inline void arch_init(char *envp[])
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60{
61 unsigned int level;
81fa6e06 62 char str[13];
7189c969 63
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64 arch_random = tsc_reliable = 0;
65
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66 cpuid(0, &level, (unsigned int *) &str[0],
67 (unsigned int *) &str[8],
68 (unsigned int *) &str[4]);
69
81fa6e06 70 str[12] = '\0';
7189c969 71 if (!strcmp(str, "GenuineIntel"))
16dc0710 72 arch_init_intel(level);
7189c969 73 else if (!strcmp(str, "AuthenticAMD"))
16dc0710 74 arch_init_amd(level);
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75}
76
77#endif