blob: da85d0b882253dab2863f04eb4a4621f4e4b0114 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
|
#ifndef _IPXE_CPUID_H
#define _IPXE_CPUID_H
/** @file
*
* x86 CPU feature detection
*
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <stdint.h>
/** An x86 CPU feature register set */
struct x86_feature_registers {
/** Features returned via %ecx */
uint32_t ecx;
/** Features returned via %edx */
uint32_t edx;
};
/** x86 CPU features */
struct x86_features {
/** Intel-defined features (%eax=0x00000001) */
struct x86_feature_registers intel;
/** AMD-defined features (%eax=0x80000001) */
struct x86_feature_registers amd;
};
/** CPUID support flag */
#define CPUID_FLAG 0x00200000UL
/** CPUID extended function */
#define CPUID_EXTENDED 0x80000000UL
/** Get vendor ID and largest standard function */
#define CPUID_VENDOR_ID 0x00000000UL
/** Get standard features */
#define CPUID_FEATURES 0x00000001UL
/** Hypervisor is present */
#define CPUID_FEATURES_INTEL_ECX_HYPERVISOR 0x80000000UL
/** Get largest extended function */
#define CPUID_AMD_MAX_FN 0x80000000UL
/** Extended function existence check */
#define CPUID_AMD_CHECK 0x80000000UL
/** Extended function existence check mask */
#define CPUID_AMD_CHECK_MASK 0xffff0000UL
/** Get extended features */
#define CPUID_AMD_FEATURES 0x80000001UL
/** Get CPU model */
#define CPUID_MODEL 0x80000002UL
/**
* Issue CPUID instruction
*
* @v operation CPUID operation
* @v eax Output via %eax
* @v ebx Output via %ebx
* @v ecx Output via %ecx
* @v edx Output via %edx
*/
static inline __attribute__ (( always_inline )) void
cpuid ( uint32_t operation, uint32_t *eax, uint32_t *ebx, uint32_t *ecx,
uint32_t *edx ) {
__asm__ ( "cpuid"
: "=a" ( *eax ), "=b" ( *ebx ), "=c" ( *ecx ), "=d" ( *edx )
: "0" ( operation ) );
}
extern int cpuid_is_supported ( void );
extern void x86_features ( struct x86_features *features );
#endif /* _IPXE_CPUID_H */
|
