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mpv/cpudetect.c
reimar 8efc898f78 cpudetect.c: check OS SSE support only with runtime detection 
Run OS support for SSE check only for runtime CPU detection.
It is pointless to run it otherwise and it causes issues
on OSes where we have not implemented a way to check.

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@33713 b3059339-0415-0410-9bf9-f77b7e298cf2
2011-07-06 13:01:07 +03:00

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/*
* This file is part of MPlayer.
*
* MPlayer is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* MPlayer 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "cpudetect.h"
#include "mp_msg.h"
CpuCaps gCpuCaps;
#include <stdlib.h>
#if ARCH_X86
#include <stdio.h>
#include <string.h>
#if defined (__NetBSD__) || defined(__OpenBSD__)
#include <sys/param.h>
#include <sys/sysctl.h>
#include <machine/cpu.h>
#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__) || defined(__APPLE__)
#include <sys/types.h>
#include <sys/sysctl.h>
#elif defined(__linux__)
#include <signal.h>
#elif defined(__MINGW32__) || defined(__CYGWIN__)
#include <windows.h>
#elif defined(__OS2__)
#define INCL_DOS
#include <os2.h>
#elif defined(__AMIGAOS4__)
#include <proto/exec.h>
#endif
/* Thanks to the FreeBSD project for some of this cpuid code, and
* help understanding how to use it. Thanks to the Mesa
* team for SSE support detection and more cpu detect code.
*/
#if CONFIG_RUNTIME_CPUDETECT
/* I believe this code works. However, it has only been used on a PII and PIII */
#if defined(__linux__) && defined(_POSIX_SOURCE) && !ARCH_X86_64
static void sigill_handler_sse( int signal, struct sigcontext sc )
{
mp_msg(MSGT_CPUDETECT,MSGL_V, "SIGILL, " );
/* Both the "xorps %%xmm0,%%xmm0" and "divps %xmm0,%%xmm1"
* instructions are 3 bytes long. We must increment the instruction
* pointer manually to avoid repeated execution of the offending
* instruction.
*
* If the SIGILL is caused by a divide-by-zero when unmasked
* exceptions aren't supported, the SIMD FPU status and control
* word will be restored at the end of the test, so we don't need
* to worry about doing it here. Besides, we may not be able to...
*/
sc.eip += 3;
gCpuCaps.hasSSE=0;
}
#endif /* __linux__ && _POSIX_SOURCE */
#if (defined(__MINGW32__) || defined(__CYGWIN__)) && !ARCH_X86_64
LONG CALLBACK win32_sig_handler_sse(EXCEPTION_POINTERS* ep)
{
if(ep->ExceptionRecord->ExceptionCode==EXCEPTION_ILLEGAL_INSTRUCTION){
mp_msg(MSGT_CPUDETECT,MSGL_V, "SIGILL, " );
ep->ContextRecord->Eip +=3;
gCpuCaps.hasSSE=0;
return EXCEPTION_CONTINUE_EXECUTION;
}
return EXCEPTION_CONTINUE_SEARCH;
}
#endif /* defined(__MINGW32__) || defined(__CYGWIN__) */
#ifdef __OS2__
ULONG _System os2_sig_handler_sse(PEXCEPTIONREPORTRECORD p1,
PEXCEPTIONREGISTRATIONRECORD p2,
PCONTEXTRECORD p3,
PVOID p4)
{
if(p1->ExceptionNum == XCPT_ILLEGAL_INSTRUCTION){
mp_msg(MSGT_CPUDETECT, MSGL_V, "SIGILL, ");
p3->ctx_RegEip += 3;
gCpuCaps.hasSSE = 0;
return XCPT_CONTINUE_EXECUTION;
}
return XCPT_CONTINUE_SEARCH;
}
#endif
/* If we're running on a processor that can do SSE, let's see if we
* are allowed to or not. This will catch 2.4.0 or later kernels that
* haven't been configured for a Pentium III but are running on one,
* and RedHat patched 2.2 kernels that have broken exception handling
* support for user space apps that do SSE.
*/
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
#define SSE_SYSCTL_NAME "hw.instruction_sse"
#elif defined(__APPLE__)
#define SSE_SYSCTL_NAME "hw.optional.sse"
#endif
static void check_os_katmai_support( void )
{
#if ARCH_X86_64
gCpuCaps.hasSSE=1;
gCpuCaps.hasSSE2=1;
#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__) || defined(__APPLE__)
int has_sse=0, ret;
size_t len=sizeof(has_sse);
ret = sysctlbyname(SSE_SYSCTL_NAME, &has_sse, &len, NULL, 0);
if (ret || !has_sse)
gCpuCaps.hasSSE=0;
#elif defined(__NetBSD__) || defined (__OpenBSD__)
#if __NetBSD_Version__ >= 105250000 || (defined __OpenBSD__)
int has_sse, has_sse2, ret, mib[2];
size_t varlen;
mib[0] = CTL_MACHDEP;
mib[1] = CPU_SSE;
varlen = sizeof(has_sse);
mp_msg(MSGT_CPUDETECT,MSGL_V, "Testing OS support for SSE... " );
ret = sysctl(mib, 2, &has_sse, &varlen, NULL, 0);
gCpuCaps.hasSSE = ret >= 0 && has_sse;
mp_msg(MSGT_CPUDETECT,MSGL_V, gCpuCaps.hasSSE ? "yes.\n" : "no!\n" );
mib[1] = CPU_SSE2;
varlen = sizeof(has_sse2);
mp_msg(MSGT_CPUDETECT,MSGL_V, "Testing OS support for SSE2... " );
ret = sysctl(mib, 2, &has_sse2, &varlen, NULL, 0);
gCpuCaps.hasSSE2 = ret >= 0 && has_sse2;
mp_msg(MSGT_CPUDETECT,MSGL_V, gCpuCaps.hasSSE2 ? "yes.\n" : "no!\n" );
#else
gCpuCaps.hasSSE = 0;
mp_msg(MSGT_CPUDETECT,MSGL_WARN, "No OS support for SSE, disabling to be safe.\n" );
#endif
#elif defined(__MINGW32__) || defined(__CYGWIN__)
LPTOP_LEVEL_EXCEPTION_FILTER exc_fil;
if ( gCpuCaps.hasSSE ) {
mp_msg(MSGT_CPUDETECT,MSGL_V, "Testing OS support for SSE... " );
exc_fil = SetUnhandledExceptionFilter(win32_sig_handler_sse);
__asm__ volatile ("xorps %xmm0, %xmm0");
SetUnhandledExceptionFilter(exc_fil);
mp_msg(MSGT_CPUDETECT,MSGL_V, gCpuCaps.hasSSE ? "yes.\n" : "no!\n" );
}
#elif defined(__OS2__)
EXCEPTIONREGISTRATIONRECORD RegRec = { 0, &os2_sig_handler_sse };
if ( gCpuCaps.hasSSE ) {
mp_msg(MSGT_CPUDETECT,MSGL_V, "Testing OS support for SSE... " );
DosSetExceptionHandler( &RegRec );
__asm__ volatile ("xorps %xmm0, %xmm0");
DosUnsetExceptionHandler( &RegRec );
mp_msg(MSGT_CPUDETECT,MSGL_V, gCpuCaps.hasSSE ? "yes.\n" : "no!\n" );
}
#elif defined(__linux__)
#if defined(_POSIX_SOURCE)
struct sigaction saved_sigill;
/* Save the original signal handlers.
*/
sigaction( SIGILL, NULL, &saved_sigill );
signal( SIGILL, (void (*)(int))sigill_handler_sse );
/* Emulate test for OSFXSR in CR4. The OS will set this bit if it
* supports the extended FPU save and restore required for SSE. If
* we execute an SSE instruction on a PIII and get a SIGILL, the OS
* doesn't support Streaming SIMD Exceptions, even if the processor
* does.
*/
if ( gCpuCaps.hasSSE ) {
mp_msg(MSGT_CPUDETECT,MSGL_V, "Testing OS support for SSE... " );
// __asm__ volatile ("xorps %%xmm0, %%xmm0");
__asm__ volatile ("xorps %xmm0, %xmm0");
mp_msg(MSGT_CPUDETECT,MSGL_V, gCpuCaps.hasSSE ? "yes.\n" : "no!\n" );
}
/* Restore the original signal handlers.
*/
sigaction( SIGILL, &saved_sigill, NULL );
/* If we've gotten to here and the XMM CPUID bit is still set, we're
* safe to go ahead and hook out the SSE code throughout Mesa.
*/
mp_msg(MSGT_CPUDETECT,MSGL_V, "Tests of OS support for SSE %s\n", gCpuCaps.hasSSE ? "passed." : "failed!" );
#else
/* We can't use POSIX signal handling to test the availability of
* SSE, so we disable it by default.
*/
mp_msg(MSGT_CPUDETECT,MSGL_WARN, "Cannot test OS support for SSE, disabling to be safe.\n" );
gCpuCaps.hasSSE=0;
#endif /* _POSIX_SOURCE */
#else
/* Do nothing on other platforms for now.
*/
mp_msg(MSGT_CPUDETECT,MSGL_WARN, "Cannot test OS support for SSE, leaving disabled.\n" );
gCpuCaps.hasSSE=0;
#endif /* __linux__ */
}
#endif
// return TRUE if cpuid supported
static int has_cpuid(void)
{
// code from libavcodec:
#if ARCH_X86_64
return 1;
#else
long a, c;
__asm__ volatile (
/* See if CPUID instruction is supported ... */
/* ... Get copies of EFLAGS into eax and ecx */
"pushfl\n\t"
"pop %0\n\t"
"mov %0, %1\n\t"
/* ... Toggle the ID bit in one copy and store */
/* to the EFLAGS reg */
"xor $0x200000, %0\n\t"
"push %0\n\t"
"popfl\n\t"
/* ... Get the (hopefully modified) EFLAGS */
"pushfl\n\t"
"pop %0\n\t"
: "=a" (a), "=c" (c)
:
: "cc"
);
return a != c;
#endif
}
void
do_cpuid(unsigned int ax, unsigned int *p)
{
// code from libavcodec:
__asm__ volatile
("mov %%"REG_b", %%"REG_S"\n\t"
"cpuid\n\t"
"xchg %%"REG_b", %%"REG_S
: "=a" (p[0]), "=S" (p[1]),
"=c" (p[2]), "=d" (p[3])
: "0" (ax));
}
void GetCpuCaps( CpuCaps *caps)
{
unsigned int regs[4];
unsigned int regs2[4];
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;
}
do_cpuid(0x00000000, regs); // get _max_ cpuid level and vendor name
mp_msg(MSGT_CPUDETECT,MSGL_V,"CPU vendor name: %.4s%.4s%.4s max cpuid level: %d\n",
(char*) (regs+1),(char*) (regs+3),(char*) (regs+2), regs[0]);
if (regs[0]>=0x00000001)
{
char *tmpstr, *ptmpstr;
unsigned cl_size;
do_cpuid(0x00000001, regs2);
caps->cpuType=(regs2[0] >> 8)&0xf;
caps->cpuModel=(regs2[0] >> 4)&0xf;
// see AMD64 Architecture Programmer's Manual, Volume 3: General-purpose and
// System Instructions, Table 3-2: Effective family computation, page 120.
if(caps->cpuType==0xf){
// use extended family (P4, IA64, K8)
caps->cpuType=0xf+((regs2[0]>>20)&255);
}
if(caps->cpuType==0xf || caps->cpuType==6)
caps->cpuModel |= ((regs2[0]>>16)&0xf) << 4;
caps->cpuStepping=regs2[0] & 0xf;
// general feature flags:
caps->hasTSC = (regs2[3] & (1 << 8 )) >> 8; // 0x0000010
caps->hasMMX = (regs2[3] & (1 << 23 )) >> 23; // 0x0800000
caps->hasSSE = (regs2[3] & (1 << 25 )) >> 25; // 0x2000000
caps->hasSSE2 = (regs2[3] & (1 << 26 )) >> 26; // 0x4000000
caps->hasSSE3 = (regs2[2] & 1); // 0x0000001
caps->hasSSSE3 = (regs2[2] & (1 << 9 )) >> 9; // 0x0000200
caps->hasMMX2 = caps->hasSSE; // SSE cpus supports mmxext too
cl_size = ((regs2[1] >> 8) & 0xFF)*8;
if(cl_size) caps->cl_size = cl_size;
ptmpstr=tmpstr=GetCpuFriendlyName(regs, regs2);
while(*ptmpstr == ' ') // strip leading spaces
ptmpstr++;
mp_msg(MSGT_CPUDETECT,MSGL_V,"CPU: %s ", ptmpstr);
free(tmpstr);
mp_msg(MSGT_CPUDETECT,MSGL_V,"(Family: %d, Model: %d, Stepping: %d)\n",
caps->cpuType, caps->cpuModel, caps->cpuStepping);
}
do_cpuid(0x80000000, regs);
if (regs[0]>=0x80000001) {
mp_msg(MSGT_CPUDETECT,MSGL_V,"extended cpuid-level: %d\n",regs[0]&0x7FFFFFFF);
do_cpuid(0x80000001, regs2);
caps->hasMMX |= (regs2[3] & (1 << 23 )) >> 23; // 0x0800000
caps->hasMMX2 |= (regs2[3] & (1 << 22 )) >> 22; // 0x400000
caps->has3DNow = (regs2[3] & (1 << 31 )) >> 31; //0x80000000
caps->has3DNowExt = (regs2[3] & (1 << 30 )) >> 30;
caps->hasSSE4a = (regs2[2] & (1 << 6 )) >> 6; // 0x0000040
}
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_V,"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,
gCpuCaps.hasMMX2,
gCpuCaps.hasSSE,
gCpuCaps.hasSSE2,
gCpuCaps.has3DNow,
gCpuCaps.has3DNowExt);
#endif
#if CONFIG_RUNTIME_CPUDETECT
/* FIXME: Does SSE2 need more OS support, too? */
if (caps->hasSSE)
check_os_katmai_support();
if (!caps->hasSSE)
caps->hasSSE2 = 0;
// caps->has3DNow=1;
// caps->hasMMX2 = 0;
// caps->hasMMX = 0;
#else
#if !HAVE_MMX
if(caps->hasMMX) mp_msg(MSGT_CPUDETECT,MSGL_WARN,"MMX supported but disabled\n");
caps->hasMMX=0;
#endif
#if !HAVE_MMX2
if(caps->hasMMX2) mp_msg(MSGT_CPUDETECT,MSGL_WARN,"MMX2 supported but disabled\n");
caps->hasMMX2=0;
#endif
#if !HAVE_SSE
if(caps->hasSSE) mp_msg(MSGT_CPUDETECT,MSGL_WARN,"SSE supported but disabled\n");
caps->hasSSE=0;
#endif
#if !HAVE_SSE2
if(caps->hasSSE2) mp_msg(MSGT_CPUDETECT,MSGL_WARN,"SSE2 supported but disabled\n");
caps->hasSSE2=0;
#endif
#if !HAVE_AMD3DNOW
if(caps->has3DNow) mp_msg(MSGT_CPUDETECT,MSGL_WARN,"3DNow supported but disabled\n");
caps->has3DNow=0;
#endif
#if !HAVE_AMD3DNOWEXT
if(caps->has3DNowExt) mp_msg(MSGT_CPUDETECT,MSGL_WARN,"3DNowExt supported but disabled\n");
caps->has3DNowExt=0;
#endif
#endif // CONFIG_RUNTIME_CPUDETECT
}
char *GetCpuFriendlyName(unsigned int regs[], unsigned int regs2[]){
char vendor[13];
char *retname;
int i;
if (NULL==(retname=malloc(256))) {
mp_msg(MSGT_CPUDETECT,MSGL_FATAL,"Error: GetCpuFriendlyName() not enough memory\n");
exit(1);
}
retname[0] = '\0';
sprintf(vendor,"%.4s%.4s%.4s",(char*)(regs+1),(char*)(regs+3),(char*)(regs+2));
do_cpuid(0x80000000,regs);
if (regs[0] >= 0x80000004)
{
// CPU has built-in namestring
for (i = 0x80000002; i <= 0x80000004; i++)
{
do_cpuid(i, regs);
strncat(retname, (char*)regs, 16);
}
}
return retname;
}
#else /* ARCH_X86 */
#ifdef __APPLE__
#include <sys/sysctl.h>
#elif defined(__AMIGAOS4__)
/* nothing */
#else
#include <signal.h>
#include <setjmp.h>
static sigjmp_buf jmpbuf;
static volatile sig_atomic_t canjump = 0;
static void sigill_handler (int sig)
{
if (!canjump) {
signal (sig, SIG_DFL);
raise (sig);
}
canjump = 0;
siglongjmp (jmpbuf, 1);
}
#endif /* __APPLE__ */
void GetCpuCaps( CpuCaps *caps)
{
caps->cpuType=0;
caps->cpuModel=0;
caps->cpuStepping=0;
caps->hasMMX=0;
caps->hasMMX2=0;
caps->has3DNow=0;
caps->has3DNowExt=0;
caps->hasSSE=0;
caps->hasSSE2=0;
caps->hasSSE3=0;
caps->hasSSSE3=0;
caps->hasSSE4a=0;
caps->isX86=0;
caps->hasAltiVec = 0;
#if HAVE_ALTIVEC
#ifdef __APPLE__
/*
rip-off from ffmpeg altivec detection code.
this code also appears on Apple's AltiVec pages.
*/
{
int sels[2] = {CTL_HW, HW_VECTORUNIT};
int has_vu = 0;
size_t len = sizeof(has_vu);
int err;
err = sysctl(sels, 2, &has_vu, &len, NULL, 0);
if (err == 0)
if (has_vu != 0)
caps->hasAltiVec = 1;
}
#elif defined(__AMIGAOS4__)
ULONG result = 0;
GetCPUInfoTags(GCIT_VectorUnit, &result, TAG_DONE);
if (result == VECTORTYPE_ALTIVEC)
caps->hasAltiVec = 1;
#else
/* no Darwin, do it the brute-force way */
/* this is borrowed from the libmpeg2 library */
{
signal (SIGILL, sigill_handler);
if (sigsetjmp (jmpbuf, 1)) {
signal (SIGILL, SIG_DFL);
} else {
canjump = 1;
__asm__ volatile ("mtspr 256, %0\n\t"
"vand %%v0, %%v0, %%v0"
:
: "r" (-1));
signal (SIGILL, SIG_DFL);
caps->hasAltiVec = 1;
}
}
#endif /* __APPLE__ */
mp_msg(MSGT_CPUDETECT,MSGL_V,"AltiVec %sfound\n", (caps->hasAltiVec ? "" : "not "));
#endif /* HAVE_ALTIVEC */
if (ARCH_IA64)
mp_msg(MSGT_CPUDETECT,MSGL_V,"CPU: Intel Itanium\n");
if (ARCH_SPARC)
mp_msg(MSGT_CPUDETECT,MSGL_V,"CPU: Sun Sparc\n");
if (ARCH_ARM)
mp_msg(MSGT_CPUDETECT,MSGL_V,"CPU: ARM\n");
if (ARCH_PPC)
mp_msg(MSGT_CPUDETECT,MSGL_V,"CPU: PowerPC\n");
if (ARCH_ALPHA)
mp_msg(MSGT_CPUDETECT,MSGL_V,"CPU: Digital Alpha\n");
if (ARCH_MIPS)
mp_msg(MSGT_CPUDETECT,MSGL_V,"CPU: MIPS\n");
if (ARCH_PA_RISC)
mp_msg(MSGT_CPUDETECT,MSGL_V,"CPU: Hewlett-Packard PA-RISC\n");
if (ARCH_S390)
mp_msg(MSGT_CPUDETECT,MSGL_V,"CPU: IBM S/390\n");
if (ARCH_S390X)
mp_msg(MSGT_CPUDETECT,MSGL_V,"CPU: IBM S/390X\n");
if (ARCH_VAX)
mp_msg(MSGT_CPUDETECT,MSGL_V, "CPU: Digital VAX\n" );
if (ARCH_XTENSA)
mp_msg(MSGT_CPUDETECT,MSGL_V, "CPU: Tensilica Xtensa\n" );
}
#endif /* !ARCH_X86 */
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