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
|
#ifndef CPUID_H
#define CPUID_H
extern inline void
cpuid (unsigned *a, unsigned *b, unsigned *c, unsigned *d, unsigned in)
{
asm ("cpuid"
: "=a" (*a),
"=b" (*b),
"=c" (*c),
"=d" (*d)
: "a" (in));
}
#ifdef __x86_64__
extern inline bool
can_set_flag (register unsigned long flag)
{
register unsigned long r1, r2;
asm("pushfq\n"
"popq %0\n"
"movq %0, %1\n"
"xorq %2, %0\n"
"pushq %0\n"
"popfq\n"
"pushfq\n"
"popq %0\n"
"pushq %1\n"
"popfq\n"
: "=&r" (r1), "=&r" (r2)
: "ir" (flag)
);
return ((r1 ^ r2) & flag) != 0;
}
#else
extern inline bool
can_set_flag (register unsigned flag)
{
register unsigned r1, r2;
asm("pushfl\n"
"popl %0\n"
"movl %0, %1\n"
"xorl %2, %0\n"
"pushl %0\n"
"popfl\n"
"pushfl\n"
"popl %0\n"
"pushl %1\n"
"popfl\n"
: "=&r" (r1), "=&r" (r2)
: "ir" (flag)
);
return ((r1 ^ r2) & flag) != 0;
}
#endif
#endif // !CPUID_H
|
