1/* 2 * This file is part of FFmpeg. 3 * 4 * FFmpeg is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Lesser General Public 6 * License as published by the Free Software Foundation; either 7 * version 2.1 of the License, or (at your option) any later version. 8 * 9 * FFmpeg is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * Lesser General Public License for more details. 13 * 14 * You should have received a copy of the GNU Lesser General Public 15 * License along with FFmpeg; if not, write to the Free Software 16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18 19 20/** 21 * @file 22 * Checks for AltiVec presence. 23 */ 24 25#ifdef __APPLE__ 26#undef _POSIX_C_SOURCE 27#include <sys/sysctl.h> 28#elif defined(__OpenBSD__) 29#include <sys/param.h> 30#include <sys/sysctl.h> 31#include <machine/cpu.h> 32#elif defined(__AMIGAOS4__) 33#include <exec/exec.h> 34#include <interfaces/exec.h> 35#include <proto/exec.h> 36#endif /* __APPLE__ */ 37 38#include "config.h" 39#include "dsputil_altivec.h" 40 41/** 42 * This function MAY rely on signal() or fork() in order to make sure AltiVec 43 * is present. 44 */ 45 46int has_altivec(void) 47{ 48#ifdef __AMIGAOS4__ 49 ULONG result = 0; 50 extern struct ExecIFace *IExec; 51 52 IExec->GetCPUInfoTags(GCIT_VectorUnit, &result, TAG_DONE); 53 if (result == VECTORTYPE_ALTIVEC) return 1; 54 return 0; 55#elif defined(__APPLE__) || defined(__OpenBSD__) 56#ifdef __OpenBSD__ 57 int sels[2] = {CTL_MACHDEP, CPU_ALTIVEC}; 58#else 59 int sels[2] = {CTL_HW, HW_VECTORUNIT}; 60#endif 61 int has_vu = 0; 62 size_t len = sizeof(has_vu); 63 int err; 64 65 err = sysctl(sels, 2, &has_vu, &len, NULL, 0); 66 67 if (err == 0) return has_vu != 0; 68 return 0; 69#elif CONFIG_RUNTIME_CPUDETECT 70 int proc_ver; 71 // Support of mfspr PVR emulation added in Linux 2.6.17. 72 __asm__ volatile("mfspr %0, 287" : "=r" (proc_ver)); 73 proc_ver >>= 16; 74 if (proc_ver & 0x8000 || 75 proc_ver == 0x000c || 76 proc_ver == 0x0039 || proc_ver == 0x003c || 77 proc_ver == 0x0044 || proc_ver == 0x0045 || 78 proc_ver == 0x0070) 79 return 1; 80 return 0; 81#else 82 // Since we were compiled for AltiVec, just assume we have it 83 // until someone comes up with a proper way (not involving signal hacks). 84 return 1; 85#endif /* __AMIGAOS4__ */ 86} 87 88