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Implement Sys_GetProcessorId for x86 and x86_64

Browse source 
Detect CPU features at runtime via cpuid - code borrowed from
libavutil.
Availability of cpuid is not checked since pentium3 supports it
and that was the minimum requirement anyway.
Only features enabled at compile time will be available.

Forced MMX/SSE/SSE2/SSE3 and it passed all tests via:
./doom3.x86_64 +disconnect +set s_noSound 1 +testSIMD
This commit is contained in:
dhewg 2011-12-13 18:56:17 +01:00
parent 18762483e6
commit f81d32918f
1 changed files with 93 additions and 1 deletions
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94
neo/sys/linux/main.cpp
View file

@ -208,9 +208,101 @@ void Sys_Shutdown( void ) {
Sys_GetProcessorId
===============
*/
static char cpustring[13] = "generic\0";
#if defined(__x86_64__) || defined(__i386__)
#if __x86_64__
# define REG_b "rbx"
# define REG_S "rsi"
#elif __i386__
# define REG_b "ebx"
# define REG_S "esi"
#endif
#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));
int Sys_GetProcessorId( void ) {
int eax, ebx, ecx, edx;
int max_std_level, max_ext_level, std_caps=0, ext_caps=0;
union { int i[3]; char c[12]; } vendor;
int i = CPUID_GENERIC;
cpuid(0, max_std_level, ebx, ecx, edx);
vendor.i[0] = ebx;
vendor.i[1] = edx;
vendor.i[2] = ecx;
strncpy(cpustring, vendor.c, 12);
cpustring[12] = 0;
Sys_Printf("Detected '%s' CPU with", cpustring);
if (max_std_level >= 1) {
cpuid(1, eax, ebx, ecx, std_caps);
#ifdef __MMX__
if (std_caps & (1<<23)) {
Sys_Printf(" MMX");
i |= CPUID_MMX;
}
#endif
#ifdef __SSE__
if (std_caps & (1<<25)) {
Sys_Printf(" SSE");
i |= CPUID_SSE;
}
#endif
#ifdef __SSE2__
if (std_caps & (1<<26)) {
Sys_Printf(" SSE2");
i |= CPUID_SSE2;
}
#endif
#ifdef __SSE3__
if (ecx & 1) {
Sys_Printf(" SSE3");
i |= CPUID_SSE3;
}
#endif
}
cpuid(0x80000000, max_ext_level, ebx, ecx, edx);
if (max_ext_level >= 0x80000001) {
cpuid(0x80000001, eax, ebx, ecx, ext_caps);
#ifdef __3dNOW__
if (ext_caps & (1U<<31)) {
Sys_Printf(" 3DNOW");
i |= CPUID_3DNOW;
}
#endif
#ifdef __MMX__
if (ext_caps & (1<<23)) {
if (!(i & CPUID_MMX))
Sys_Printf(" MMX");
i |= CPUID_MMX;
}
#endif
}
Sys_Printf("\n");
return i;
}
#else
int Sys_GetProcessorId( void ) {
return CPUID_GENERIC;
}
#endif
/*
===============
@ -218,7 +310,7 @@ Sys_GetProcessorString
===============
*/
const char *Sys_GetProcessorString( void ) {
return "generic";
return cpustring;
}
/*