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cpu cache line length detection

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from mplayerxp (Nick Kurshev <nickols_k@mail.ru>)


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@8861 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
arpi 2003-01-09 18:39:09 +00:00
parent 88aee88ab5
commit 3a250d3760
2 changed files with 13 additions and 2 deletions
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14
cpudetect.c
View File

@ -98,9 +98,9 @@ void GetCpuCaps( CpuCaps *caps)
unsigned int regs[4];
unsigned int regs2[4];
caps->isX86=1;
memset(caps, 0, sizeof(*caps));
caps->isX86=1;
caps->cl_size=32; /* default */
if (!has_cpuid()) {
mp_msg(MSGT_CPUDETECT,MSGL_WARN,"CPUID not supported!??? (maybe an old 486?)\n");
return;
@ -111,6 +111,7 @@ void GetCpuCaps( CpuCaps *caps)
if (regs[0]>=0x00000001)
{
char *tmpstr;
unsigned cl_size;
do_cpuid(0x00000001, regs2);
@ -132,6 +133,8 @@ void GetCpuCaps( CpuCaps *caps)
caps->hasSSE = (regs2[3] & (1 << 25 )) >> 25; // 0x2000000
caps->hasSSE2 = (regs2[3] & (1 << 26 )) >> 26; // 0x4000000
caps->hasMMX2 = caps->hasSSE; // SSE cpus supports mmxext too
cl_size = ((regs2[1] >> 8) & 0xFF)*8;
if(cl_size) caps->cl_size = cl_size;
}
do_cpuid(0x80000000, regs);
if (regs[0]>=0x80000001) {
@ -142,6 +145,13 @@ void GetCpuCaps( CpuCaps *caps)
caps->has3DNow = (regs2[3] & (1 << 31 )) >> 31; //0x80000000
caps->has3DNowExt = (regs2[3] & (1 << 30 )) >> 30;
}
if(regs[0]>=0x80000006)
{
do_cpuid(0x80000006, regs2);
mp_msg(MSGT_CPUDETECT,MSGL_V,"extended cache-info: %d\n",regs2[2]&0x7FFFFFFF);
caps->cl_size = regs2[2] & 0xFF;
}
mp_msg(MSGT_CPUDETECT,MSGL_INFO,"Detected cache-line size is %u bytes\n",caps->cl_size);
#if 0
mp_msg(MSGT_CPUDETECT,MSGL_INFO,"cpudetect: MMX=%d MMX2=%d SSE=%d SSE2=%d 3DNow=%d 3DNowExt=%d\n",
gCpuCaps.hasMMX,

1
cpudetect.h
View File

@ -16,6 +16,7 @@ typedef struct cpucaps_s {
int hasSSE;
int hasSSE2;
int isX86;
unsigned cl_size; /* size of cache line */
} CpuCaps;
extern CpuCaps gCpuCaps;