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
|
/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License v2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
/*
* Detect CPU feature bits at runtime (x86_64 only)
*/
#ifndef __CPU_UTILS_H__
#define __CPU_UTILS_H__
#include <stdbool.h>
#define ENUM_CPU_BIT(name) \
__ ## name ## _BIT, \
name = (1U << __ ## name ## _BIT), \
__ ## name ## _SEQ = __ ## name ## _BIT
enum cpu_feature {
ENUM_CPU_BIT(CPU_FLAG_NONE),
ENUM_CPU_BIT(CPU_FLAG_SSE2),
ENUM_CPU_BIT(CPU_FLAG_SSSE3),
ENUM_CPU_BIT(CPU_FLAG_SSE41),
ENUM_CPU_BIT(CPU_FLAG_SSE42),
ENUM_CPU_BIT(CPU_FLAG_SHA),
ENUM_CPU_BIT(CPU_FLAG_AVX),
ENUM_CPU_BIT(CPU_FLAG_AVX2),
};
#undef ENUM_CPU_BIT
/* Private but in public header to allow inlining */
extern unsigned long __cpu_flags;
extern unsigned long __cpu_flags_orig;
/* Public API */
void cpu_detect_flags(void);
void cpu_set_level(unsigned long topbit);
void cpu_reset_level(void);
void cpu_print_flags(void);
static inline bool cpu_has_feature(enum cpu_feature f)
{
return __cpu_flags & f;
}
#endif
|
