#include "config.h" #include "cpudetect.h" #include "mp_msg.h" CpuCaps gCpuCaps; #ifdef HAVE_MALLOC_H #include <malloc.h> #endif #include <stdlib.h> #ifdef ARCH_X86 #include <stdio.h> #include <string.h> #ifdef __NetBSD__ #include <sys/param.h> #include <sys/sysctl.h> #include <machine/cpu.h> #endif #ifdef __FreeBSD__ #include <sys/types.h> #include <sys/sysctl.h> #endif #ifdef __linux__ #include <signal.h> #endif //#define X86_FXSR_MAGIC /* 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. */ /* I believe this code works. However, it has only been used on a PII and PIII */ static void check_os_katmai_support( void ); #if 1 // return TRUE if cpuid supported static int has_cpuid() { int a, c; // code from libavcodec: __asm__ __volatile__ ( /* See if CPUID instruction is supported ... */ /* ... Get copies of EFLAGS into eax and ecx */ "pushf\n\t" "popl %0\n\t" "movl %0, %1\n\t" /* ... Toggle the ID bit in one copy and store */ /* to the EFLAGS reg */ "xorl $0x200000, %0\n\t" "push %0\n\t" "popf\n\t" /* ... Get the (hopefully modified) EFLAGS */ "pushf\n\t" "popl %0\n\t" : "=a" (a), "=c" (c) : : "cc" ); return (a!=c); } #endif static void do_cpuid(unsigned int ax, unsigned int *p) { #if 0 __asm __volatile( "cpuid;" : "=a" (p[0]), "=b" (p[1]), "=c" (p[2]), "=d" (p[3]) : "0" (ax) ); #else // code from libavcodec: __asm __volatile ("movl %%ebx, %%esi\n\t" "cpuid\n\t" "xchgl %%ebx, %%esi" : "=a" (p[0]), "=S" (p[1]), "=c" (p[2]), "=d" (p[3]) : "0" (ax)); #endif } 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; unsigned cl_size; do_cpuid(0x00000001, regs2); tmpstr=GetCpuFriendlyName(regs, regs2); mp_msg(MSGT_CPUDETECT,MSGL_INFO,"CPU: %s ",tmpstr); free(tmpstr); caps->cpuType=(regs2[0] >> 8)&0xf; if(caps->cpuType==0xf){ // use extended family (P4, IA64) caps->cpuType=8+((regs2[0]>>20)&255); } caps->cpuStepping=regs2[0] & 0xf; mp_msg(MSGT_CPUDETECT,MSGL_INFO,"(Family: %d, Stepping: %d)\n", caps->cpuType, caps->cpuStepping); // general feature flags: 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->hasMMX2 = caps->hasSSE; // SSE cpus supports mmxext too cl_size = ((regs2[1] >> 8) & 0xFF)*8; if(cl_size) caps->cl_size = cl_size; } 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; } 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_INFO,"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 /* FIXME: Does SSE2 need more OS support, too? */ #if defined(__linux__) || defined(__FreeBSD__) || defined(__NetBSD__) if (caps->hasSSE) check_os_katmai_support(); if (!caps->hasSSE) caps->hasSSE2 = 0; #else caps->hasSSE=0; caps->hasSSE2 = 0; #endif // caps->has3DNow=1; // caps->hasMMX2 = 0; // caps->hasMMX = 0; #ifndef HAVE_MMX if(caps->hasMMX) mp_msg(MSGT_CPUDETECT,MSGL_WARN,"MMX supported but disabled\n"); caps->hasMMX=0; #endif #ifndef HAVE_MMX2 if(caps->hasMMX2) mp_msg(MSGT_CPUDETECT,MSGL_WARN,"MMX2 supported but disabled\n"); caps->hasMMX2=0; #endif #ifndef HAVE_SSE if(caps->hasSSE) mp_msg(MSGT_CPUDETECT,MSGL_WARN,"SSE supported but disabled\n"); caps->hasSSE=0; #endif #ifndef HAVE_SSE2 if(caps->hasSSE2) mp_msg(MSGT_CPUDETECT,MSGL_WARN,"SSE2 supported but disabled\n"); caps->hasSSE2=0; #endif #ifndef HAVE_3DNOW if(caps->has3DNow) mp_msg(MSGT_CPUDETECT,MSGL_WARN,"3DNow supported but disabled\n"); caps->has3DNow=0; #endif #ifndef HAVE_3DNOWEX if(caps->has3DNowExt) mp_msg(MSGT_CPUDETECT,MSGL_WARN,"3DNowExt supported but disabled\n"); caps->has3DNowExt=0; #endif } #define CPUID_EXTFAMILY ((regs2[0] >> 20)&0xFF) /* 27..20 */ #define CPUID_EXTMODEL ((regs2[0] >> 16)&0x0F) /* 19..16 */ #define CPUID_TYPE ((regs2[0] >> 12)&0x04) /* 13..12 */ #define CPUID_FAMILY ((regs2[0] >> 8)&0x0F) /* 11..08 */ #define CPUID_MODEL ((regs2[0] >> 4)&0x0F) /* 07..04 */ #define CPUID_STEPPING ((regs2[0] >> 0)&0x0F) /* 03..00 */ char *GetCpuFriendlyName(unsigned int regs[], unsigned int regs2[]){ #include "cputable.h" /* get cpuname and cpuvendors */ char vendor[17]; char *retname; int i; if (NULL==(retname=(char*)malloc(256))) { mp_msg(MSGT_CPUDETECT,MSGL_FATAL,"Error: GetCpuFriendlyName() not enough memory\n"); exit(1); } sprintf(vendor,"%.4s%.4s%.4s",(char*)(regs+1),(char*)(regs+3),(char*)(regs+2)); for(i=0; i<MAX_VENDORS; i++){ if(!strcmp(cpuvendors[i].string,vendor)){ if(cpuname[i][CPUID_FAMILY][CPUID_MODEL]){ snprintf(retname,255,"%s %s",cpuvendors[i].name,cpuname[i][CPUID_FAMILY][CPUID_MODEL]); } else { snprintf(retname,255,"unknown %s %d. Generation CPU",cpuvendors[i].name,CPUID_FAMILY); mp_msg(MSGT_CPUDETECT,MSGL_WARN,"unknown %s CPU:\n",cpuvendors[i].name); mp_msg(MSGT_CPUDETECT,MSGL_WARN,"Vendor: %s\n",cpuvendors[i].string); mp_msg(MSGT_CPUDETECT,MSGL_WARN,"Type: %d\n",CPUID_TYPE); mp_msg(MSGT_CPUDETECT,MSGL_WARN,"Family: %d (ext: %d)\n",CPUID_FAMILY,CPUID_EXTFAMILY); mp_msg(MSGT_CPUDETECT,MSGL_WARN,"Model: %d (ext: %d)\n",CPUID_MODEL,CPUID_EXTMODEL); mp_msg(MSGT_CPUDETECT,MSGL_WARN,"Stepping: %d\n",CPUID_STEPPING); mp_msg(MSGT_CPUDETECT,MSGL_WARN,"Please send the above info along with the exact CPU name" "to the MPlayer-Developers, so we can add it to the list!\n"); } } } //printf("Detected CPU: %s\n", retname); return retname; } #undef CPUID_EXTFAMILY #undef CPUID_EXTMODEL #undef CPUID_TYPE #undef CPUID_FAMILY #undef CPUID_MODEL #undef CPUID_STEPPING #if defined(__linux__) && defined(_POSIX_SOURCE) && defined(X86_FXSR_MAGIC) 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; } static void sigfpe_handler_sse( int signal, struct sigcontext sc ) { mp_msg(MSGT_CPUDETECT,MSGL_V, "SIGFPE, " ); if ( sc.fpstate->magic != 0xffff ) { /* Our signal context has the extended FPU state, so reset the * divide-by-zero exception mask and clear the divide-by-zero * exception bit. */ sc.fpstate->mxcsr |= 0x00000200; sc.fpstate->mxcsr &= 0xfffffffb; } else { /* If we ever get here, we're completely hosed. */ mp_msg(MSGT_CPUDETECT,MSGL_V, "\n\n" ); mp_msg(MSGT_CPUDETECT,MSGL_V, "SSE enabling test failed badly!" ); } } #endif /* __linux__ && _POSIX_SOURCE && X86_FXSR_MAGIC */ /* 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. */ static void check_os_katmai_support( void ) { #if defined(__FreeBSD__) int has_sse=0, ret; size_t len=sizeof(has_sse); ret = sysctlbyname("hw.instruction_sse", &has_sse, &len, NULL, 0); if (ret || !has_sse) gCpuCaps.hasSSE=0; #elif defined(__NetBSD__) #if __NetBSD_Version__ >= 105250000 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); if (ret < 0 || !has_sse) { gCpuCaps.hasSSE=0; mp_msg(MSGT_CPUDETECT,MSGL_V, "no!\n" ); } else { gCpuCaps.hasSSE=1; mp_msg(MSGT_CPUDETECT,MSGL_V, "yes!\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); if (ret < 0 || !has_sse2) { gCpuCaps.hasSSE2=0; mp_msg(MSGT_CPUDETECT,MSGL_V, "no!\n" ); } else { gCpuCaps.hasSSE2=1; mp_msg(MSGT_CPUDETECT,MSGL_V, "yes!\n" ); } #else gCpuCaps.hasSSE = 0; mp_msg(MSGT_CPUDETECT,MSGL_WARN, "No OS support for SSE, disabling to be safe.\n" ); #endif #elif defined(__linux__) #if defined(_POSIX_SOURCE) && defined(X86_FXSR_MAGIC) struct sigaction saved_sigill; struct sigaction saved_sigfpe; /* Save the original signal handlers. */ sigaction( SIGILL, NULL, &saved_sigill ); sigaction( SIGFPE, NULL, &saved_sigfpe ); signal( SIGILL, (void (*)(int))sigill_handler_sse ); signal( SIGFPE, (void (*)(int))sigfpe_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"); if ( gCpuCaps.hasSSE ) { mp_msg(MSGT_CPUDETECT,MSGL_V, "yes.\n" ); } else { mp_msg(MSGT_CPUDETECT,MSGL_V, "no!\n" ); } } /* Emulate test for OSXMMEXCPT in CR4. The OS will set this bit if * it supports unmasked SIMD FPU exceptions. If we unmask the * exceptions, do a SIMD divide-by-zero and get a SIGILL, the OS * doesn't support unmasked SIMD FPU exceptions. If we get a SIGFPE * as expected, we're okay but we need to clean up after it. * * Are we being too stringent in our requirement that the OS support * unmasked exceptions? Certain RedHat 2.2 kernels enable SSE by * setting CR4.OSFXSR but don't support unmasked exceptions. Win98 * doesn't even support them. We at least know the user-space SSE * support is good in kernels that do support unmasked exceptions, * and therefore to be safe I'm going to leave this test in here. */ if ( gCpuCaps.hasSSE ) { mp_msg(MSGT_CPUDETECT,MSGL_V, "Testing OS support for SSE unmasked exceptions... " ); // test_os_katmai_exception_support(); if ( gCpuCaps.hasSSE ) { mp_msg(MSGT_CPUDETECT,MSGL_V, "yes.\n" ); } else { mp_msg(MSGT_CPUDETECT,MSGL_V, "no!\n" ); } } /* Restore the original signal handlers. */ sigaction( SIGILL, &saved_sigill, NULL ); sigaction( SIGFPE, &saved_sigfpe, 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. */ if ( gCpuCaps.hasSSE ) { mp_msg(MSGT_CPUDETECT,MSGL_V, "Tests of OS support for SSE passed.\n" ); } else { mp_msg(MSGT_CPUDETECT,MSGL_V, "Tests of OS support for SSE failed!\n" ); } #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 && X86_FXSR_MAGIC */ #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__ */ } #else /* ARCH_X86 */ #ifdef SYS_DARWIN #include <sys/sysctl.h> #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 void GetCpuCaps( CpuCaps *caps) { caps->cpuType=0; caps->cpuStepping=0; caps->hasMMX=0; caps->hasMMX2=0; caps->has3DNow=0; caps->has3DNowExt=0; caps->hasSSE=0; caps->hasSSE2=0; caps->isX86=0; caps->hasAltiVec = 0; #ifdef HAVE_ALTIVEC #ifdef SYS_DARWIN /* 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; mp_msg(MSGT_CPUDETECT,MSGL_INFO,"AltiVec %sfound\n", (caps->hasAltiVec ? "" : "not ")); } #else /* SYS_DARWIN */ /* 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 /* SYS_DARWIN */ #endif /* HAVE_ALTIVEC */ } #endif /* !ARCH_X86 */