/
SDL_cpuinfo.c
290 lines (263 loc) · 8.23 KB
/
SDL_cpuinfo.c
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2004 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Sam Lantinga
slouken@libsdl.org
*/
#ifdef SAVE_RCSID
static char rcsid =
"@(#) $Id$";
#endif
/* CPU feature detection for SDL */
#include "SDL.h"
#include "SDL_cpuinfo.h"
#ifdef MACOSX
#include <sys/sysctl.h> /* For AltiVec check */
#endif
#define CPU_HAS_RDTSC 0x00000001
#define CPU_HAS_MMX 0x00000002
#define CPU_HAS_3DNOW 0x00000004
#define CPU_HAS_SSE 0x00000008
#define CPU_HAS_ALTIVEC 0x00000010
static __inline__ int CPU_haveCPUID()
{
int has_CPUID = 0;
#if defined(__GNUC__) && defined(i386)
__asm__ (
"push %%ecx\n"
" pushfl # Get original EFLAGS \n"
" popl %%eax \n"
" movl %%eax,%%ecx \n"
" xorl $0x200000,%%eax # Flip ID bit in EFLAGS \n"
" pushl %%eax # Save new EFLAGS value on stack \n"
" popfl # Replace current EFLAGS value \n"
" pushfl # Get new EFLAGS \n"
" popl %%eax # Store new EFLAGS in EAX \n"
" xorl %%ecx,%%eax # Can not toggle ID bit, \n"
" jz 1f # Processor=80486 \n"
" movl $1,%0 # We have CPUID support \n"
"1: \n"
"pop %%ecx\n"
: "=r" (has_CPUID)
:
: "%eax", "%ecx"
);
#elif defined(_MSC_VER)
__asm {
pushfd ; Get original EFLAGS
pop eax
mov ecx, eax
xor eax, 200000h ; Flip ID bit in EFLAGS
push eax ; Save new EFLAGS value on stack
popfd ; Replace current EFLAGS value
pushfd ; Get new EFLAGS
pop eax ; Store new EFLAGS in EAX
xor eax, ecx ; Can not toggle ID bit,
jz done ; Processor=80486
mov has_CPUID,1 ; We have CPUID support
done:
}
#endif
return has_CPUID;
}
static __inline__ int CPU_getCPUIDFeatures()
{
int features = 0;
#if defined(__GNUC__) && defined(i386)
__asm__ (
"push %%ebx\n"
"push %%ecx\n"
"push %%edx\n"
" xorl %%eax,%%eax # Set up for CPUID instruction \n"
" cpuid # Get and save vendor ID \n"
" cmpl $1,%%eax # Make sure 1 is valid input for CPUID\n"
" jl 1f # We dont have the CPUID instruction\n"
" xorl %%eax,%%eax \n"
" incl %%eax \n"
" cpuid # Get family/model/stepping/features\n"
" movl %%edx,%0 \n"
"1: \n"
"pop %%edx\n"
"pop %%ecx\n"
"pop %%ebx\n"
: "=r" (features)
:
: "%eax", "%ebx", "%ecx", "%edx"
);
#elif defined(_MSC_VER)
__asm {
xor eax, eax ; Set up for CPUID instruction
cpuid ; Get and save vendor ID
cmp eax, 1 ; Make sure 1 is valid input for CPUID
jl done ; We dont have the CPUID instruction
xor eax, eax
inc eax
cpuid ; Get family/model/stepping/features
mov features, edx
done:
}
#endif
return features;
}
static __inline__ int CPU_haveRDTSC()
{
if ( CPU_haveCPUID() ) {
return (CPU_getCPUIDFeatures() & 0x00000010);
}
return 0;
}
static __inline__ int CPU_haveMMX()
{
if ( CPU_haveCPUID() ) {
return (CPU_getCPUIDFeatures() & 0x00800000);
}
return 0;
}
static __inline__ int CPU_have3DNow()
{
int has_3DNow = 0;
if ( !CPU_haveCPUID() ) {
return 0;
}
#if defined(__GNUC__) && defined(i386)
__asm__ (
"push %%ebx\n"
"push %%ecx\n"
"push %%edx\n"
" movl $0x80000000,%%eax # Query for extended functions \n"
" cpuid # Get extended function limit \n"
" cmpl $0x80000001,%%eax \n"
" jbe 1f # Nope, we dont have function 800000001h\n"
" movl $0x80000001,%%eax # Setup extended function 800000001h\n"
" cpuid # and get the information \n"
" testl $0x80000000,%%edx # Bit 31 is set if 3DNow! present \n"
" jz 1f # Nope, we dont have 3DNow support\n"
" movl $1,%0 # Yep, we have 3DNow! support! \n"
"1: \n"
"pop %%edx\n"
"pop %%ecx\n"
"pop %%ebx\n"
: "=r" (has_3DNow)
:
: "%eax", "%ebx", "%ecx", "%edx"
);
#elif defined(_MSC_VER)
__asm {
mov eax,80000000h ; Query for extended functions
cpuid ; Get extended function limit
cmp eax,80000001h
jbe done ; Nope, we dont have function 800000001h
mov eax,80000001h ; Setup extended function 800000001h
cpuid ; and get the information
test edx,80000000h ; Bit 31 is set if 3DNow! present
jz done ; Nope, we dont have 3DNow support
mov has_3DNow,1 ; Yep, we have 3DNow! support!
done:
}
#endif
return has_3DNow;
}
static __inline__ int CPU_haveSSE()
{
if ( CPU_haveCPUID() ) {
return (CPU_getCPUIDFeatures() & 0x02000000);
}
return 0;
}
static __inline__ int CPU_haveAltiVec()
{
#ifdef MACOSX
/* TODO: This check works on OS X. It would be nice to detect AltiVec
properly on for example Linux/PPC, too. But I don't know how that
is done in Linux (or FreeBSD, or whatever other OS you run PPC :-)
*/
int selectors[2] = { CTL_HW, HW_VECTORUNIT };
int hasVectorUnit = 0;
size_t length = sizeof(hasVectorUnit);
int error = sysctl(selectors, 2, &hasVectorUnit, &length, NULL, 0);
if( 0 == error )
return hasVectorUnit != 0;
#endif
return 0;
}
static Uint32 SDL_CPUFeatures = 0xFFFFFFFF;
static Uint32 SDL_GetCPUFeatures()
{
if ( SDL_CPUFeatures == 0xFFFFFFFF ) {
SDL_CPUFeatures = 0;
if ( CPU_haveRDTSC() ) {
SDL_CPUFeatures |= CPU_HAS_RDTSC;
}
if ( CPU_haveMMX() ) {
SDL_CPUFeatures |= CPU_HAS_MMX;
}
if ( CPU_have3DNow() ) {
SDL_CPUFeatures |= CPU_HAS_3DNOW;
}
if ( CPU_haveSSE() ) {
SDL_CPUFeatures |= CPU_HAS_SSE;
}
if ( CPU_haveAltiVec() ) {
SDL_CPUFeatures |= CPU_HAS_ALTIVEC;
}
}
return SDL_CPUFeatures;
}
SDL_bool SDL_HasRDTSC()
{
if ( SDL_GetCPUFeatures() & CPU_HAS_RDTSC ) {
return SDL_TRUE;
}
return SDL_FALSE;
}
SDL_bool SDL_HasMMX()
{
if ( SDL_GetCPUFeatures() & CPU_HAS_MMX ) {
return SDL_TRUE;
}
return SDL_FALSE;
}
SDL_bool SDL_Has3DNow()
{
if ( SDL_GetCPUFeatures() & CPU_HAS_3DNOW ) {
return SDL_TRUE;
}
return SDL_FALSE;
}
SDL_bool SDL_HasSSE()
{
if ( SDL_GetCPUFeatures() & CPU_HAS_SSE ) {
return SDL_TRUE;
}
return SDL_FALSE;
}
SDL_bool SDL_HasAltiVec()
{
if ( SDL_GetCPUFeatures() & CPU_HAS_ALTIVEC ) {
return SDL_TRUE;
}
return SDL_FALSE;
}
#ifdef TEST_MAIN
#include <stdio.h>
int main()
{
printf("RDTSC: %d\n", SDL_HasRDTSC());
printf("MMX: %d\n", SDL_HasMMX());
printf("3DNow: %d\n", SDL_Has3DNow());
printf("SSE: %d\n", SDL_HasSSE());
printf("AltiVec: %d\n", SDL_HasAltiVec());
return 0;
}
#endif /* TEST_MAIN */