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SDL_cpuinfo.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2006 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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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
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Sam Lantinga
slouken@libsdl.org
*/
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#include "SDL_config.h"
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/* CPU feature detection for SDL */
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#include "SDL.h"
#include "SDL_cpuinfo.h"
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#if defined(__MACOSX__) && defined(__ppc__)
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#include <sys/sysctl.h> /* For AltiVec check */
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#elif SDL_ALTIVEC_BLITTERS && HAVE_SETJMP
#include <signal.h>
#include <setjmp.h>
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#endif
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#define CPU_HAS_RDTSC 0x00000001
#define CPU_HAS_MMX 0x00000002
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#define CPU_HAS_MMXEXT 0x00000004
#define CPU_HAS_3DNOW 0x00000010
#define CPU_HAS_3DNOWEXT 0x00000020
#define CPU_HAS_SSE 0x00000040
#define CPU_HAS_SSE2 0x00000080
#define CPU_HAS_ALTIVEC 0x00000100
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#if SDL_ALTIVEC_BLITTERS && HAVE_SETJMP && !__MACOSX__
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/* This is the brute force way of detecting instruction sets...
the idea is borrowed from the libmpeg2 library - thanks!
*/
static jmp_buf jmpbuf;
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static void
illegal_instruction(int sig)
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longjmp(jmpbuf, 1);
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#endif /* HAVE_SETJMP */
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static __inline__ int
CPU_haveCPUID(void)
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int has_CPUID = 0;
/* *INDENT-OFF* */
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#if defined(__GNUC__) && defined(i386)
__asm__ (
" 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"
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: "=m" (has_CPUID)
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:
: "%eax", "%ecx"
);
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#elif defined(__GNUC__) && defined(__x86_64__)
/* Technically, if this is being compiled under __x86_64__ then it has
CPUid by definition. But it's nice to be able to prove it. :) */
__asm__ (
" pushfq # Get original EFLAGS \n"
" popq %%rax \n"
" movq %%rax,%%rcx \n"
" xorl $0x200000,%%eax # Flip ID bit in EFLAGS \n"
" pushq %%rax # Save new EFLAGS value on stack \n"
" popfq # Replace current EFLAGS value \n"
" pushfq # Get new EFLAGS \n"
" popq %%rax # 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"
: "=m" (has_CPUID)
:
: "%rax", "%rcx"
);
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#elif (defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)
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__asm {
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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:
}
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#elif defined(__sun) && defined(__i386)
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" popl %eax \n"
" movl %eax,%ecx \n"
" xorl $0x200000,%eax \n"
" pushl %eax \n"
" popfl \n"
" pushfl \n"
" popl %eax \n"
" xorl %ecx,%eax \n"
" jz 1f \n"
" movl $1,-8(%ebp) \n"
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"1: \n"
);
#elif defined(__sun) && defined(__amd64)
__asm (
" pushfq \n"
" popq %rax \n"
" movq %rax,%rcx \n"
" xorl $0x200000,%eax \n"
" pushq %rax \n"
" popfq \n"
" pushfq \n"
" popq %rax \n"
" xorl %ecx,%eax \n"
" jz 1f \n"
" movl $1,-8(%rbp) \n"
"1: \n"
);
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/* *INDENT-ON* */
return has_CPUID;
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static __inline__ int
CPU_getCPUIDFeatures(void)
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int features = 0;
/* *INDENT-OFF* */
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#if defined(__GNUC__) && ( defined(i386) || defined(__x86_64__) )
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__asm__ (
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" movl %%ebx,%%edi\n"
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" 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"
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" movl %%edi,%%ebx\n"
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: "=m" (features)
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: "%eax", "%ecx", "%edx", "%edi"
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#elif (defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)
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__asm {
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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:
}
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#elif defined(__sun) && (defined(__i386) || defined(__amd64))
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__asm(
" movl %ebx,%edi\n"
" xorl %eax,%eax \n"
" cpuid \n"
" cmpl $1,%eax \n"
" jl 1f \n"
" xorl %eax,%eax \n"
" incl %eax \n"
" cpuid \n"
#ifdef __i386
" movl %edx,-8(%ebp) \n"
#else
" movl %edx,-8(%rbp) \n"
#endif
"1: \n"
" movl %edi,%ebx\n" );
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/* *INDENT-ON* */
return features;
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static __inline__ int
CPU_getCPUIDFeaturesExt(void)
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int features = 0;
/* *INDENT-OFF* */
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#if defined(__GNUC__) && (defined(i386) || defined (__x86_64__) )
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__asm__ (
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" movl %%ebx,%%edi\n"
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" movl $0x80000000,%%eax # Query for extended functions \n"
" cpuid # Get extended function limit \n"
" cmpl $0x80000001,%%eax \n"
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" jl 1f # Nope, we dont have function 800000001h\n"
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" movl $0x80000001,%%eax # Setup extended function 800000001h\n"
" cpuid # and get the information \n"
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" movl %%edx,%0 \n"
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"1: \n"
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" movl %%edi,%%ebx\n"
: "=m" (features)
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: "%eax", "%ecx", "%edx", "%edi"
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#elif (defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)
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__asm {
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mov eax,80000000h ; Query for extended functions
cpuid ; Get extended function limit
cmp eax,80000001h
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jl done ; Nope, we dont have function 800000001h
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mov eax,80000001h ; Setup extended function 800000001h
cpuid ; and get the information
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mov features,edx
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done:
}
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#elif defined(__sun) && ( defined(__i386) || defined(__amd64) )
__asm (
" movl %ebx,%edi\n"
" movl $0x80000000,%eax \n"
" cpuid \n"
" cmpl $0x80000001,%eax \n"
" jl 1f \n"
" movl $0x80000001,%eax \n"
" cpuid \n"
#ifdef __i386
" movl %edx,-8(%ebp) \n"
#else
" movl %edx,-8(%rbp) \n"
#endif
"1: \n"
" movl %edi,%ebx\n"
);
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/* *INDENT-ON* */
return features;
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static __inline__ int
CPU_haveRDTSC(void)
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if (CPU_haveCPUID()) {
return (CPU_getCPUIDFeatures() & 0x00000010);
}
return 0;
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static __inline__ int
CPU_haveMMX(void)
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if (CPU_haveCPUID()) {
return (CPU_getCPUIDFeatures() & 0x00800000);
}
return 0;
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static __inline__ int
CPU_haveMMXExt(void)
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if (CPU_haveCPUID()) {
return (CPU_getCPUIDFeaturesExt() & 0x00400000);
}
return 0;
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static __inline__ int
CPU_have3DNow(void)
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if (CPU_haveCPUID()) {
return (CPU_getCPUIDFeaturesExt() & 0x80000000);
}
return 0;
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static __inline__ int
CPU_have3DNowExt(void)
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if (CPU_haveCPUID()) {
return (CPU_getCPUIDFeaturesExt() & 0x40000000);
}
return 0;
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static __inline__ int
CPU_haveSSE(void)
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if (CPU_haveCPUID()) {
return (CPU_getCPUIDFeatures() & 0x02000000);
}
return 0;
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static __inline__ int
CPU_haveSSE2(void)
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if (CPU_haveCPUID()) {
return (CPU_getCPUIDFeatures() & 0x04000000);
}
return 0;
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static __inline__ int
CPU_haveAltiVec(void)
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volatile int altivec = 0;
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#if defined(__MACOSX__) && defined(__ppc__)
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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)
altivec = (hasVectorUnit != 0);
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#elif SDL_ALTIVEC_BLITTERS && HAVE_SETJMP
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void (*handler) (int sig);
handler = signal(SIGILL, illegal_instruction);
if (setjmp(jmpbuf) == 0) {
asm volatile ("mtspr 256, %0\n\t" "vand %%v0, %%v0, %%v0"::"r" (-1));
altivec = 1;
}
signal(SIGILL, handler);
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#endif
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return altivec;
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static Uint32 SDL_CPUFeatures = 0xFFFFFFFF;
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static Uint32
SDL_GetCPUFeatures(void)
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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_haveMMXExt()) {
SDL_CPUFeatures |= CPU_HAS_MMXEXT;
}
if (CPU_have3DNow()) {
SDL_CPUFeatures |= CPU_HAS_3DNOW;
}
if (CPU_have3DNowExt()) {
SDL_CPUFeatures |= CPU_HAS_3DNOWEXT;
}
if (CPU_haveSSE()) {
SDL_CPUFeatures |= CPU_HAS_SSE;
}
if (CPU_haveSSE2()) {
SDL_CPUFeatures |= CPU_HAS_SSE2;
}
if (CPU_haveAltiVec()) {
SDL_CPUFeatures |= CPU_HAS_ALTIVEC;
}
}
return SDL_CPUFeatures;
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SDL_bool
SDL_HasRDTSC(void)
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if (SDL_GetCPUFeatures() & CPU_HAS_RDTSC) {
return SDL_TRUE;
}
return SDL_FALSE;
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SDL_bool
SDL_HasMMX(void)
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if (SDL_GetCPUFeatures() & CPU_HAS_MMX) {
return SDL_TRUE;
}
return SDL_FALSE;
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SDL_bool
SDL_HasMMXExt(void)
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if (SDL_GetCPUFeatures() & CPU_HAS_MMXEXT) {
return SDL_TRUE;
}
return SDL_FALSE;
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SDL_bool
SDL_Has3DNow(void)
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if (SDL_GetCPUFeatures() & CPU_HAS_3DNOW) {
return SDL_TRUE;
}
return SDL_FALSE;
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SDL_bool
SDL_Has3DNowExt(void)
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if (SDL_GetCPUFeatures() & CPU_HAS_3DNOWEXT) {
return SDL_TRUE;
}
return SDL_FALSE;
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SDL_bool
SDL_HasSSE(void)
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if (SDL_GetCPUFeatures() & CPU_HAS_SSE) {
return SDL_TRUE;
}
return SDL_FALSE;
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SDL_bool
SDL_HasSSE2(void)
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if (SDL_GetCPUFeatures() & CPU_HAS_SSE2) {
return SDL_TRUE;
}
return SDL_FALSE;
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SDL_bool
SDL_HasAltiVec(void)
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if (SDL_GetCPUFeatures() & CPU_HAS_ALTIVEC) {
return SDL_TRUE;
}
return SDL_FALSE;
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#ifdef TEST_MAIN
#include <stdio.h>
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printf("RDTSC: %d\n", SDL_HasRDTSC());
printf("MMX: %d\n", SDL_HasMMX());
printf("MMXExt: %d\n", SDL_HasMMXExt());
printf("3DNow: %d\n", SDL_Has3DNow());
printf("3DNowExt: %d\n", SDL_Has3DNowExt());
printf("SSE: %d\n", SDL_HasSSE());
printf("SSE2: %d\n", SDL_HasSSE2());
printf("AltiVec: %d\n", SDL_HasAltiVec());
return 0;
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}
#endif /* TEST_MAIN */
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/* vi: set ts=4 sw=4 expandtab: */