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SDL_cpuinfo.c
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2011 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_cpuinfo.h"
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#ifdef HAVE_SYSCONF
#include <unistd.h>
#endif
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#ifdef HAVE_SYSCTLBYNAME
#include <sys/types.h>
#include <sys/sysctl.h>
#endif
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#ifdef __WIN32__
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#include "../core/windows/SDL_windows.h"
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#define CPU_HAS_RDTSC 0x00000001
#define CPU_HAS_MMX 0x00000002
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#define CPU_HAS_SSE 0x00000010
#define CPU_HAS_SSE2 0x00000020
#define CPU_HAS_SSE3 0x00000040
#define CPU_HAS_SSE4 0x00000080
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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)
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" 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)
:
: "%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. :) */
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" 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"
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: "=m" (has_CPUID)
:
: "%rax", "%rcx"
);
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#elif (defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)
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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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#elif defined(__sun) && defined(__amd64)
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" 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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#if defined(__GNUC__) && defined(i386)
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#define cpuid(func, a, b, c, d) \
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__asm__ __volatile__ ( \
" pushl %%ebx \n" \
" cpuid \n" \
" movl %%ebx, %%esi \n" \
" popl %%ebx \n" : \
"=a" (a), "=S" (b), "=c" (c), "=d" (d) : "a" (func))
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#elif defined(__GNUC__) && defined(__x86_64__)
#define cpuid(func, a, b, c, d) \
__asm__ __volatile__ ( \
" pushq %%rbx \n" \
" cpuid \n" \
" movq %%rbx, %%rsi \n" \
" popq %%rbx \n" : \
"=a" (a), "=S" (b), "=c" (c), "=d" (d) : "a" (func))
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#elif (defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)
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#define cpuid(func, a, b, c, d) \
__asm { \
__asm mov eax, func \
__asm cpuid \
__asm mov a, eax \
__asm mov b, ebx \
__asm mov c, ecx \
__asm mov d, edx \
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#define cpuid(func, a, b, c, d) \
a = b = c = d = 0
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static __inline__ int
CPU_getCPUIDFeatures(void)
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int features = 0;
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int a, b, c, d;
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cpuid(0, a, b, c, d);
if (a >= 1) {
cpuid(1, a, b, c, d);
features = d;
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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
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CPU_haveSSE(void)
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if (CPU_haveCPUID()) {
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return (CPU_getCPUIDFeatures() & 0x02000000);
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}
return 0;
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static __inline__ int
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CPU_haveSSE2(void)
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if (CPU_haveCPUID()) {
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return (CPU_getCPUIDFeatures() & 0x04000000);
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}
return 0;
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static __inline__ int
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CPU_haveSSE3(void)
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if (CPU_haveCPUID()) {
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int a, b, c, d;
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cpuid(0, a, b, c, d);
if (a >= 1) {
cpuid(1, a, b, c, d);
return (c & 0x00000001);
}
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}
return 0;
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static __inline__ int
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CPU_haveSSE4(void)
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if (CPU_haveCPUID()) {
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int a, b, c, d;
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cpuid(0, a, b, c, d);
if (a >= 1) {
cpuid(1, a, b, c, d);
return (c & 0x00000100);
}
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static int SDL_CPUCount = 0;
int
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SDL_GetCPUCount(void)
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{
if (!SDL_CPUCount) {
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#if defined(HAVE_SYSCONF) && defined(_SC_NPROCESSORS_ONLN)
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if (SDL_CPUCount <= 0) {
SDL_CPUCount = (int)sysconf(_SC_NPROCESSORS_ONLN);
}
#endif
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#ifdef HAVE_SYSCTLBYNAME
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if (SDL_CPUCount <= 0) {
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size_t size = sizeof(SDL_CPUCount);
sysctlbyname("hw.ncpu", &SDL_CPUCount, &size, NULL, 0);
}
#endif
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#ifdef __WIN32__
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if (SDL_CPUCount <= 0) {
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SYSTEM_INFO info;
GetSystemInfo(&info);
SDL_CPUCount = info.dwNumberOfProcessors;
}
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#endif
/* There has to be at least 1, right? :) */
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if (SDL_CPUCount <= 0) {
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SDL_CPUCount = 1;
}
}
return SDL_CPUCount;
}
/* Oh, such a sweet sweet trick, just not very useful. :) */
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static const char *
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SDL_GetCPUType(void)
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static char SDL_CPUType[13];
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if (!SDL_CPUType[0]) {
int i = 0;
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int a, b, c, d;
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if (CPU_haveCPUID()) {
cpuid(0x00000000, a, b, c, d);
SDL_CPUType[i++] = (char)(b & 0xff); b >>= 8;
SDL_CPUType[i++] = (char)(b & 0xff); b >>= 8;
SDL_CPUType[i++] = (char)(b & 0xff); b >>= 8;
SDL_CPUType[i++] = (char)(b & 0xff); b >>= 8;
SDL_CPUType[i++] = (char)(d & 0xff); d >>= 8;
SDL_CPUType[i++] = (char)(d & 0xff); d >>= 8;
SDL_CPUType[i++] = (char)(d & 0xff); d >>= 8;
SDL_CPUType[i++] = (char)(d & 0xff); d >>= 8;
SDL_CPUType[i++] = (char)(c & 0xff); c >>= 8;
SDL_CPUType[i++] = (char)(c & 0xff); c >>= 8;
SDL_CPUType[i++] = (char)(c & 0xff); c >>= 8;
SDL_CPUType[i++] = (char)(c & 0xff); c >>= 8;
}
if (!SDL_CPUType[0]) {
SDL_strlcpy(SDL_CPUType, "Unknown", sizeof(SDL_CPUType));
}
}
return SDL_CPUType;
}
static const char *
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SDL_GetCPUName(void)
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{
static char SDL_CPUName[48];
if (!SDL_CPUName[0]) {
int i = 0;
int a, b, c, d;
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if (CPU_haveCPUID()) {
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cpuid(0x80000000, a, b, c, d);
if (a >= 0x80000004) {
cpuid(0x80000002, a, b, c, d);
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SDL_CPUName[i++] = (char)(a & 0xff); a >>= 8;
SDL_CPUName[i++] = (char)(a & 0xff); a >>= 8;
SDL_CPUName[i++] = (char)(a & 0xff); a >>= 8;
SDL_CPUName[i++] = (char)(a & 0xff); a >>= 8;
SDL_CPUName[i++] = (char)(b & 0xff); b >>= 8;
SDL_CPUName[i++] = (char)(b & 0xff); b >>= 8;
SDL_CPUName[i++] = (char)(b & 0xff); b >>= 8;
SDL_CPUName[i++] = (char)(b & 0xff); b >>= 8;
SDL_CPUName[i++] = (char)(c & 0xff); c >>= 8;
SDL_CPUName[i++] = (char)(c & 0xff); c >>= 8;
SDL_CPUName[i++] = (char)(c & 0xff); c >>= 8;
SDL_CPUName[i++] = (char)(c & 0xff); c >>= 8;
SDL_CPUName[i++] = (char)(d & 0xff); d >>= 8;
SDL_CPUName[i++] = (char)(d & 0xff); d >>= 8;
SDL_CPUName[i++] = (char)(d & 0xff); d >>= 8;
SDL_CPUName[i++] = (char)(d & 0xff); d >>= 8;
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cpuid(0x80000003, a, b, c, d);
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SDL_CPUName[i++] = (char)(a & 0xff); a >>= 8;
SDL_CPUName[i++] = (char)(a & 0xff); a >>= 8;
SDL_CPUName[i++] = (char)(a & 0xff); a >>= 8;
SDL_CPUName[i++] = (char)(a & 0xff); a >>= 8;
SDL_CPUName[i++] = (char)(b & 0xff); b >>= 8;
SDL_CPUName[i++] = (char)(b & 0xff); b >>= 8;
SDL_CPUName[i++] = (char)(b & 0xff); b >>= 8;
SDL_CPUName[i++] = (char)(b & 0xff); b >>= 8;
SDL_CPUName[i++] = (char)(c & 0xff); c >>= 8;
SDL_CPUName[i++] = (char)(c & 0xff); c >>= 8;
SDL_CPUName[i++] = (char)(c & 0xff); c >>= 8;
SDL_CPUName[i++] = (char)(c & 0xff); c >>= 8;
SDL_CPUName[i++] = (char)(d & 0xff); d >>= 8;
SDL_CPUName[i++] = (char)(d & 0xff); d >>= 8;
SDL_CPUName[i++] = (char)(d & 0xff); d >>= 8;
SDL_CPUName[i++] = (char)(d & 0xff); d >>= 8;
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cpuid(0x80000004, a, b, c, d);
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SDL_CPUName[i++] = (char)(a & 0xff); a >>= 8;
SDL_CPUName[i++] = (char)(a & 0xff); a >>= 8;
SDL_CPUName[i++] = (char)(a & 0xff); a >>= 8;
SDL_CPUName[i++] = (char)(a & 0xff); a >>= 8;
SDL_CPUName[i++] = (char)(b & 0xff); b >>= 8;
SDL_CPUName[i++] = (char)(b & 0xff); b >>= 8;
SDL_CPUName[i++] = (char)(b & 0xff); b >>= 8;
SDL_CPUName[i++] = (char)(b & 0xff); b >>= 8;
SDL_CPUName[i++] = (char)(c & 0xff); c >>= 8;
SDL_CPUName[i++] = (char)(c & 0xff); c >>= 8;
SDL_CPUName[i++] = (char)(c & 0xff); c >>= 8;
SDL_CPUName[i++] = (char)(c & 0xff); c >>= 8;
SDL_CPUName[i++] = (char)(d & 0xff); d >>= 8;
SDL_CPUName[i++] = (char)(d & 0xff); d >>= 8;
SDL_CPUName[i++] = (char)(d & 0xff); d >>= 8;
SDL_CPUName[i++] = (char)(d & 0xff); d >>= 8;
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if (!SDL_CPUName[0]) {
SDL_strlcpy(SDL_CPUName, "Unknown", sizeof(SDL_CPUName));
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return SDL_CPUName;
}
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int
SDL_GetCPUCacheLineSize(void)
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{
const char *cpuType = SDL_GetCPUType();
if (SDL_strcmp(cpuType, "GenuineIntel") == 0) {
int a, b, c, d;
cpuid(0x00000001, a, b, c, d);
return (((b >> 8) & 0xff) * 8);
} else if (SDL_strcmp(cpuType, "AuthenticAMD") == 0) {
int a, b, c, d;
cpuid(0x80000005, a, b, c, d);
return (c & 0xff);
} else {
/* Just make a guess here... */
return SDL_CACHELINE_SIZE;
}
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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_haveSSE()) {
SDL_CPUFeatures |= CPU_HAS_SSE;
}
if (CPU_haveSSE2()) {
SDL_CPUFeatures |= CPU_HAS_SSE2;
}
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if (CPU_haveSSE3()) {
SDL_CPUFeatures |= CPU_HAS_SSE3;
}
if (CPU_haveSSE4()) {
SDL_CPUFeatures |= CPU_HAS_SSE4;
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}
}
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_HasSSE(void)
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if (SDL_GetCPUFeatures() & CPU_HAS_SSE) {
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return SDL_TRUE;
}
return SDL_FALSE;
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SDL_HasSSE2(void)
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if (SDL_GetCPUFeatures() & CPU_HAS_SSE2) {
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return SDL_TRUE;
}
return SDL_FALSE;
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SDL_HasSSE3(void)
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if (SDL_GetCPUFeatures() & CPU_HAS_SSE3) {
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return SDL_TRUE;
}
return SDL_FALSE;
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SDL_HasSSE4(void)
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if (SDL_GetCPUFeatures() & CPU_HAS_SSE4) {
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return SDL_TRUE;
}
return SDL_FALSE;
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#ifdef TEST_MAIN
#include <stdio.h>
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printf("CPU count: %d\n", SDL_GetCPUCount());
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printf("CPU type: %s\n", SDL_GetCPUType());
printf("CPU name: %s\n", SDL_GetCPUName());
printf("CacheLine size: %d\n", SDL_GetCPUCacheLineSize());
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printf("RDTSC: %d\n", SDL_HasRDTSC());
printf("MMX: %d\n", SDL_HasMMX());
printf("SSE: %d\n", SDL_HasSSE());
printf("SSE2: %d\n", SDL_HasSSE2());
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printf("SSE3: %d\n", SDL_HasSSE3());
printf("SSE4: %d\n", SDL_HasSSE4());
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}
#endif /* TEST_MAIN */
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/* vi: set ts=4 sw=4 expandtab: */