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122 lines
3.6 KiB
122 lines
3.6 KiB
/* |
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* CPU detection code, extracted from mmx.h |
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* (c)1997-99 by H. Dietz and R. Fisher |
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* Converted to C and improved by Fabrice Bellard. |
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* |
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* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2 of the License, or (at your option) any later version. |
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* |
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* This library 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 GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with this library; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include <stdlib.h> |
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#include "../dsputil.h" |
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#ifdef ARCH_X86_64 |
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# define REG_b "rbx" |
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# define REG_S "rsi" |
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#else |
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# define REG_b "ebx" |
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# define REG_S "esi" |
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#endif |
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/* ebx saving is necessary for PIC. gcc seems unable to see it alone */ |
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#define cpuid(index,eax,ebx,ecx,edx)\ |
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__asm __volatile\ |
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("mov %%"REG_b", %%"REG_S"\n\t"\ |
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"cpuid\n\t"\ |
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"xchg %%"REG_b", %%"REG_S\ |
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: "=a" (eax), "=S" (ebx),\ |
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"=c" (ecx), "=d" (edx)\ |
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: "0" (index)); |
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/* Function to test if multimedia instructions are supported... */ |
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int mm_support(void) |
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{ |
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int rval = 0; |
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int eax, ebx, ecx, edx; |
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int max_std_level, max_ext_level, std_caps=0, ext_caps=0; |
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long a, c; |
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__asm__ __volatile__ ( |
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/* See if CPUID instruction is supported ... */ |
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/* ... Get copies of EFLAGS into eax and ecx */ |
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"pushf\n\t" |
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"pop %0\n\t" |
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"mov %0, %1\n\t" |
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/* ... Toggle the ID bit in one copy and store */ |
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/* to the EFLAGS reg */ |
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"xor $0x200000, %0\n\t" |
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"push %0\n\t" |
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"popf\n\t" |
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/* ... Get the (hopefully modified) EFLAGS */ |
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"pushf\n\t" |
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"pop %0\n\t" |
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: "=a" (a), "=c" (c) |
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: |
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: "cc" |
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); |
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if (a == c) |
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return 0; /* CPUID not supported */ |
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cpuid(0, max_std_level, ebx, ecx, edx); |
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if(max_std_level >= 1){ |
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cpuid(1, eax, ebx, ecx, std_caps); |
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if (std_caps & (1<<23)) |
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rval |= MM_MMX; |
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if (std_caps & (1<<25)) |
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rval |= MM_MMXEXT | MM_SSE; |
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if (std_caps & (1<<26)) |
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rval |= MM_SSE2; |
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if (ecx & 1) |
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rval |= MM_SSE3; |
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} |
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cpuid(0x80000000, max_ext_level, ebx, ecx, edx); |
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if(max_ext_level >= 0x80000001){ |
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cpuid(0x80000001, eax, ebx, ecx, ext_caps); |
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if (ext_caps & (1<<31)) |
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rval |= MM_3DNOW; |
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if (ext_caps & (1<<30)) |
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rval |= MM_3DNOWEXT; |
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if (ext_caps & (1<<23)) |
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rval |= MM_MMX; |
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if (ext_caps & (1<<22)) |
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rval |= MM_MMXEXT; |
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} |
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#if 0 |
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av_log(NULL, AV_LOG_DEBUG, "%s%s%s%s%s%s\n", |
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(rval&MM_MMX) ? "MMX ":"", |
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(rval&MM_MMXEXT) ? "MMX2 ":"", |
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(rval&MM_SSE) ? "SSE ":"", |
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(rval&MM_SSE2) ? "SSE2 ":"", |
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(rval&MM_3DNOW) ? "3DNow ":"", |
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(rval&MM_3DNOWEXT) ? "3DNowExt ":""); |
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#endif |
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return rval; |
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} |
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#ifdef __TEST__ |
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int main ( void ) |
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{ |
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int mm_flags; |
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mm_flags = mm_support(); |
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printf("mm_support = 0x%08X\n",mm_flags); |
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return 0; |
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} |
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#endif
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