66 lines
1.2 KiB
C
66 lines
1.2 KiB
C
/* cpuid.h: Define cpuid instruction
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#ifndef CPUID_H
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#define CPUID_H
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static inline void __attribute ((always_inline))
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cpuid (uint32_t *a, uint32_t *b, uint32_t *c, uint32_t *d, uint32_t ain,
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uint32_t cin = 0)
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{
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asm volatile ("cpuid"
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: "=a" (*a), "=b" (*b), "=c" (*c), "=d" (*d)
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: "a" (ain), "c" (cin));
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}
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#ifdef __x86_64__
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static inline bool __attribute ((always_inline))
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can_set_flag (register uint32_t long flag)
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{
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register uint32_t long r1, r2;
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asm volatile ("pushfq\n"
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"popq %0\n"
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"movq %0, %1\n"
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"xorq %2, %0\n"
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"pushq %0\n"
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"popfq\n"
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"pushfq\n"
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"popq %0\n"
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"pushq %1\n"
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"popfq\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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#else
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static inline bool __attribute ((always_inline))
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can_set_flag (register uint32_t flag)
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{
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register uint32_t r1, r2;
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asm volatile ("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
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#endif // !CPUID_H
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