36 lines
587 B
C
36 lines
587 B
C
#ifndef CPUID_H
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#define CPUID_H
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extern inline void
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cpuid (unsigned *a, unsigned *b, unsigned *c, unsigned *d, unsigned in)
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{
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asm ("cpuid"
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: "=a" (*a),
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"=b" (*b),
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"=c" (*c),
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"=d" (*d)
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: "a" (in));
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}
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extern inline bool
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can_set_flag (unsigned flag)
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{
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unsigned r1, r2;
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asm("pushfl\n"
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"popl %0\n"
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"movl %0, %1\n"
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"xorl %2, %0\n"
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"pushl %0\n"
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"popfl\n"
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"pushfl\n"
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"popl %0\n"
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"pushl %1\n"
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"popfl\n"
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: "=&r" (r1), "=&r" (r2)
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: "ir" (flag)
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);
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return ((r1 ^ r2) & flag) != 0;
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}
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#endif // !CPUID_H
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