nengel@2: /*
nengel@2:  * CPU detection code, extracted from mmx.h
nengel@2:  * (c)1997-99 by H. Dietz and R. Fisher
nengel@2:  * Converted to C and improved by Fabrice Bellard.
nengel@2:  *
nengel@2:  * This file is part of FFmpeg.
nengel@2:  *
nengel@2:  * FFmpeg is free software; you can redistribute it and/or
nengel@2:  * modify it under the terms of the GNU Lesser General Public
nengel@2:  * License as published by the Free Software Foundation; either
nengel@2:  * version 2.1 of the License, or (at your option) any later version.
nengel@2:  *
nengel@2:  * FFmpeg is distributed in the hope that it will be useful,
nengel@2:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
nengel@2:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
nengel@2:  * Lesser General Public License for more details.
nengel@2:  *
nengel@2:  * You should have received a copy of the GNU Lesser General Public
nengel@2:  * License along with FFmpeg; if not, write to the Free Software
nengel@2:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
nengel@2:  */
nengel@2: 
nengel@2: #include <stdlib.h>
nengel@2: #include "libavutil/x86_cpu.h"
nengel@2: #include "libavcodec/dsputil.h"
nengel@2: 
nengel@2: #undef printf
nengel@2: 
nengel@2: /* ebx saving is necessary for PIC. gcc seems unable to see it alone */
nengel@2: #define cpuid(index,eax,ebx,ecx,edx)\
nengel@2:     __asm__ volatile\
nengel@2:         ("mov %%"REG_b", %%"REG_S"\n\t"\
nengel@2:          "cpuid\n\t"\
nengel@2:          "xchg %%"REG_b", %%"REG_S\
nengel@2:          : "=a" (eax), "=S" (ebx),\
nengel@2:            "=c" (ecx), "=d" (edx)\
nengel@2:          : "0" (index));
nengel@2: 
nengel@2: /* Function to test if multimedia instructions are supported...  */
nengel@2: int mm_support()
nengel@2: {
nengel@2:     int rval = 0;
nengel@2:     int eax, ebx, ecx, edx;
nengel@2:     int max_std_level, max_ext_level, std_caps=0, ext_caps=0;
nengel@2: 
nengel@2: #if ARCH_X86_32
nengel@2:     x86_reg a, c;
nengel@2:     __asm__ volatile (
nengel@2:         /* See if CPUID instruction is supported ... */
nengel@2:         /* ... Get copies of EFLAGS into eax and ecx */
nengel@2:         "pushfl\n\t"
nengel@2:         "pop %0\n\t"
nengel@2:         "mov %0, %1\n\t"
nengel@2: 
nengel@2:         /* ... Toggle the ID bit in one copy and store */
nengel@2:         /*     to the EFLAGS reg */
nengel@2:         "xor $0x200000, %0\n\t"
nengel@2:         "push %0\n\t"
nengel@2:         "popfl\n\t"
nengel@2: 
nengel@2:         /* ... Get the (hopefully modified) EFLAGS */
nengel@2:         "pushfl\n\t"
nengel@2:         "pop %0\n\t"
nengel@2:         : "=a" (a), "=c" (c)
nengel@2:         :
nengel@2:         : "cc"
nengel@2:         );
nengel@2: 
nengel@2:     if (a == c)
nengel@2:         return 0; /* CPUID not supported */
nengel@2: #endif
nengel@2: 
nengel@2:     cpuid(0, max_std_level, ebx, ecx, edx);
nengel@2: 
nengel@2:     if(max_std_level >= 1){
nengel@2:         cpuid(1, eax, ebx, ecx, std_caps);
nengel@2:         if (std_caps & (1<<23))
nengel@2:             rval |= FF_MM_MMX;
nengel@2:         if (std_caps & (1<<25))
nengel@2:             rval |= FF_MM_MMX2
nengel@2: #if HAVE_SSE
nengel@2:                   | FF_MM_SSE;
nengel@2:         if (std_caps & (1<<26))
nengel@2:             rval |= FF_MM_SSE2;
nengel@2:         if (ecx & 1)
nengel@2:             rval |= FF_MM_SSE3;
nengel@2:         if (ecx & 0x00000200 )
nengel@2:             rval |= FF_MM_SSSE3;
nengel@2:         if (ecx & 0x00080000 )
nengel@2:             rval |= FF_MM_SSE4;
nengel@2:         if (ecx & 0x00100000 )
nengel@2:             rval |= FF_MM_SSE42;
nengel@2: #endif
nengel@2:                   ;
nengel@2:     }
nengel@2: 
nengel@2:     cpuid(0x80000000, max_ext_level, ebx, ecx, edx);
nengel@2: 
nengel@2:     if(max_ext_level >= 0x80000001){
nengel@2:         cpuid(0x80000001, eax, ebx, ecx, ext_caps);
nengel@2:         if (ext_caps & (1<<31))
nengel@2:             rval |= FF_MM_3DNOW;
nengel@2:         if (ext_caps & (1<<30))
nengel@2:             rval |= FF_MM_3DNOWEXT;
nengel@2:         if (ext_caps & (1<<23))
nengel@2:             rval |= FF_MM_MMX;
nengel@2:         if (ext_caps & (1<<22))
nengel@2:             rval |= FF_MM_MMX2;
nengel@2:     }
nengel@2: 
nengel@2: #if 0
nengel@2:     av_log(NULL, AV_LOG_DEBUG, "%s%s%s%s%s%s%s%s%s%s\n",
nengel@2:         (rval&FF_MM_MMX) ? "MMX ":"",
nengel@2:         (rval&FF_MM_MMX2) ? "MMX2 ":"",
nengel@2:         (rval&FF_MM_SSE) ? "SSE ":"",
nengel@2:         (rval&FF_MM_SSE2) ? "SSE2 ":"",
nengel@2:         (rval&FF_MM_SSE3) ? "SSE3 ":"",
nengel@2:         (rval&FF_MM_SSSE3) ? "SSSE3 ":"",
nengel@2:         (rval&FF_MM_SSE4) ? "SSE4.1 ":"",
nengel@2:         (rval&FF_MM_SSE42) ? "SSE4.2 ":"",
nengel@2:         (rval&FF_MM_3DNOW) ? "3DNow ":"",
nengel@2:         (rval&FF_MM_3DNOWEXT) ? "3DNowExt ":"");
nengel@2: #endif
nengel@2:     return rval;
nengel@2: }
nengel@2: 
nengel@2: #ifdef TEST
nengel@2: int main ( void )
nengel@2: {
nengel@2:     int mm_flags;
nengel@2:     mm_flags = mm_support();
nengel@2:     printf("mm_support = 0x%08X\n",mm_flags);
nengel@2:     return 0;
nengel@2: }
nengel@2: #endif