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67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
/*
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* Copyright (C) 2011 Andrea Mazzoleni
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __CPU_H
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#define __CPU_H
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#if defined(__i386__) || defined(__x86_64__)
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#define X86_FEATURE_MMX (0*32+23) /* Multimedia Extensions */
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#define X86_FEATURE_FXSR (0*32+24) /* FXSAVE and FXRSTOR instructions (fast save and restore) */
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#define X86_FEATURE_XMM (0*32+25) /* Streaming SIMD Extensions */
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#define X86_FEATURE_XMM2 (0*32+26) /* Streaming SIMD Extensions-2 */
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#define X86_FEATURE_MMXEXT (1*32+22) /* AMD MMX extensions */
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static inline int cpu_has(uint32_t flag)
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{
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uint32_t eax = (flag >> 5) ? 0x80000001 : 1;
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uint32_t edx;
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asm volatile(
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#if defined(__i386__)
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/* allow compilation in PIC mode saving ebx */
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"push %%ebx\n"
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"cpuid\n"
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"pop %%ebx\n"
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: "+a" (eax), "=d" (edx)
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: : "ecx");
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#else
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"cpuid\n"
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: "+a" (eax), "=d" (edx)
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: : "ecx", "ebx");
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#endif
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return (edx >> (flag & 31)) & 1;
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}
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static inline int cpu_has_mmx(void)
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{
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return cpu_has(X86_FEATURE_MMX);
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}
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static inline int cpu_has_sse2(void)
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{
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return cpu_has(X86_FEATURE_MMX) &&
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cpu_has(X86_FEATURE_FXSR) &&
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cpu_has(X86_FEATURE_XMM) &&
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cpu_has(X86_FEATURE_XMM2);
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}
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#endif
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#endif
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