mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-15 11:44:49 +00:00
132 lines
3.9 KiB
C
132 lines
3.9 KiB
C
/* Cpu detection code, extracted from mmx.h ((c)1997-99 by H. Dietz
|
|
and R. Fisher). Converted to C and improved by Fabrice Bellard */
|
|
|
|
#include <stdlib.h>
|
|
#include "../dsputil.h"
|
|
|
|
#ifdef ARCH_X86_64
|
|
# define REG_b "rbx"
|
|
# define REG_S "rsi"
|
|
#else
|
|
# define REG_b "ebx"
|
|
# define REG_S "esi"
|
|
#endif
|
|
|
|
/* ebx saving is necessary for PIC. gcc seems unable to see it alone */
|
|
#define cpuid(index,eax,ebx,ecx,edx)\
|
|
__asm __volatile\
|
|
("mov %%"REG_b", %%"REG_S"\n\t"\
|
|
"cpuid\n\t"\
|
|
"xchg %%"REG_b", %%"REG_S\
|
|
: "=a" (eax), "=S" (ebx),\
|
|
"=c" (ecx), "=d" (edx)\
|
|
: "0" (index));
|
|
|
|
/* Function to test if multimedia instructions are supported... */
|
|
int mm_support(void)
|
|
{
|
|
int rval = 0;
|
|
int eax, ebx, ecx, edx;
|
|
int max_std_level, max_ext_level, std_caps=0, ext_caps=0;
|
|
long a, c;
|
|
|
|
__asm__ __volatile__ (
|
|
/* See if CPUID instruction is supported ... */
|
|
/* ... Get copies of EFLAGS into eax and ecx */
|
|
"pushf\n\t"
|
|
"pop %0\n\t"
|
|
"mov %0, %1\n\t"
|
|
|
|
/* ... Toggle the ID bit in one copy and store */
|
|
/* to the EFLAGS reg */
|
|
"xor $0x200000, %0\n\t"
|
|
"push %0\n\t"
|
|
"popf\n\t"
|
|
|
|
/* ... Get the (hopefully modified) EFLAGS */
|
|
"pushf\n\t"
|
|
"pop %0\n\t"
|
|
: "=a" (a), "=c" (c)
|
|
:
|
|
: "cc"
|
|
);
|
|
|
|
if (a == c)
|
|
return 0; /* CPUID not supported */
|
|
|
|
cpuid(0, max_std_level, ebx, ecx, edx);
|
|
|
|
if(max_std_level >= 1){
|
|
cpuid(1, eax, ebx, ecx, std_caps);
|
|
if (std_caps & (1<<23))
|
|
rval |= MM_MMX;
|
|
if (std_caps & (1<<25))
|
|
rval |= MM_MMXEXT | MM_SSE;
|
|
if (std_caps & (1<<26))
|
|
rval |= MM_SSE2;
|
|
}
|
|
|
|
cpuid(0x80000000, max_ext_level, ebx, ecx, edx);
|
|
|
|
if(max_ext_level >= 0x80000001){
|
|
cpuid(0x80000001, eax, ebx, ecx, ext_caps);
|
|
if (ext_caps & (1<<31))
|
|
rval |= MM_3DNOW;
|
|
if (ext_caps & (1<<30))
|
|
rval |= MM_3DNOWEXT;
|
|
if (ext_caps & (1<<23))
|
|
rval |= MM_MMX;
|
|
}
|
|
|
|
cpuid(0, eax, ebx, ecx, edx);
|
|
if ( ebx == 0x68747541 &&
|
|
edx == 0x69746e65 &&
|
|
ecx == 0x444d4163) {
|
|
/* AMD */
|
|
if(ext_caps & (1<<22))
|
|
rval |= MM_MMXEXT;
|
|
} else if (ebx == 0x746e6543 &&
|
|
edx == 0x48727561 &&
|
|
ecx == 0x736c7561) { /* "CentaurHauls" */
|
|
/* VIA C3 */
|
|
if(ext_caps & (1<<24))
|
|
rval |= MM_MMXEXT;
|
|
} else if (ebx == 0x69727943 &&
|
|
edx == 0x736e4978 &&
|
|
ecx == 0x64616574) {
|
|
/* Cyrix Section */
|
|
/* See if extended CPUID level 80000001 is supported */
|
|
/* The value of CPUID/80000001 for the 6x86MX is undefined
|
|
according to the Cyrix CPU Detection Guide (Preliminary
|
|
Rev. 1.01 table 1), so we'll check the value of eax for
|
|
CPUID/0 to see if standard CPUID level 2 is supported.
|
|
According to the table, the only CPU which supports level
|
|
2 is also the only one which supports extended CPUID levels.
|
|
*/
|
|
if (eax < 2)
|
|
return rval;
|
|
if (ext_caps & (1<<24))
|
|
rval |= MM_MMXEXT;
|
|
}
|
|
#if 0
|
|
av_log(NULL, AV_LOG_DEBUG, "%s%s%s%s%s%s\n",
|
|
(rval&MM_MMX) ? "MMX ":"",
|
|
(rval&MM_MMXEXT) ? "MMX2 ":"",
|
|
(rval&MM_SSE) ? "SSE ":"",
|
|
(rval&MM_SSE2) ? "SSE2 ":"",
|
|
(rval&MM_3DNOW) ? "3DNow ":"",
|
|
(rval&MM_3DNOWEXT) ? "3DNowExt ":"");
|
|
#endif
|
|
return rval;
|
|
}
|
|
|
|
#ifdef __TEST__
|
|
int main ( void )
|
|
{
|
|
int mm_flags;
|
|
mm_flags = mm_support();
|
|
printf("mm_support = 0x%08X\n",mm_flags);
|
|
return 0;
|
|
}
|
|
#endif
|