83 строки
2.4 KiB
C
83 строки
2.4 KiB
C
/*
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* Copyright © 2010-2012 Université Bordeaux 1
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* Copyright © 2010 Cisco Systems, Inc. All rights reserved.
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*
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* See COPYING in top-level directory.
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*/
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/* Internals for x86's cpuid. */
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#ifndef HWLOC_PRIVATE_CPUID_H
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#define HWLOC_PRIVATE_CPUID_H
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#ifdef HWLOC_X86_32_ARCH
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static __hwloc_inline int hwloc_have_cpuid(void)
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{
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int ret;
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unsigned tmp, tmp2;
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asm(
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"mov $0,%0\n\t" /* Not supported a priori */
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"pushfl \n\t" /* Save flags */
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"pushfl \n\t" \
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"pop %1 \n\t" /* Get flags */ \
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#define TRY_TOGGLE \
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"xor $0x00200000,%1\n\t" /* Try to toggle ID */ \
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"mov %1,%2\n\t" /* Save expected value */ \
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"push %1 \n\t" \
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"popfl \n\t" /* Try to toggle */ \
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"pushfl \n\t" \
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"pop %1 \n\t" \
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"cmp %1,%2\n\t" /* Compare with expected value */ \
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"jnz Lhwloc1\n\t" /* Unexpected, failure */ \
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TRY_TOGGLE /* Try to set/clear */
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TRY_TOGGLE /* Try to clear/set */
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"mov $1,%0\n\t" /* Passed the test! */
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"Lhwloc1: \n\t"
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"popfl \n\t" /* Restore flags */
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: "=r" (ret), "=&r" (tmp), "=&r" (tmp2));
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return ret;
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}
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#endif /* HWLOC_X86_32_ARCH */
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#ifdef HWLOC_X86_64_ARCH
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static __hwloc_inline int hwloc_have_cpuid(void) { return 1; }
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#endif /* HWLOC_X86_64_ARCH */
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static __hwloc_inline void hwloc_cpuid(unsigned *eax, unsigned *ebx, unsigned *ecx, unsigned *edx)
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{
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#ifdef HWLOC_X86_64_ARCH
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unsigned long sav_ebx;
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asm(
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/* Note: can't easily use stack since the compiler assumes we don't touch the redzone */
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"mov %%rbx,%2\n\t"
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"cpuid\n\t"
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"xchg %2,%%rbx\n\t"
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"movl %k2,%1\n\t"
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: "+a" (*eax), "=m" (*ebx), "=&r"(sav_ebx),
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"+c" (*ecx), "=&d" (*edx));
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#elif defined(HWLOC_X86_32_ARCH)
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asm(
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/* Note: gcc might want to use ebx for %1 addressing :/ */
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"push %%ebx\n\t"
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"cpuid\n\t"
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"push %%eax\n\t"
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"mov %%ebx,%%eax\n\t"
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"mov 4(%%esp),%%ebx\n\t"
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"mov %%eax,%1\n\t"
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"pop %%eax\n\t"
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"add $4,%%esp\n\t"
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: "+a" (*eax), "=m" (*ebx),
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"+c" (*ecx), "=&d" (*edx));
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#else
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#error unknown architecture
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#endif
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}
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#endif /* HWLOC_PRIVATE_CPUID_H */
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