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 libavcodec/ppc/check_altivec.c 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/** 39 * This function MAY rely on signal() or fork() in order to make sure AltiVec 40 * is present. 41 */ 42 43int has_altivec(void) 44{ 45#ifdef __AMIGAOS4__ 46 ULONG result = 0; 47 extern struct ExecIFace *IExec; 48 49 IExec->GetCPUInfoTags(GCIT_VectorUnit, &result, TAG_DONE); 50 if (result == VECTORTYPE_ALTIVEC) return 1; 51 return 0; 52#elif defined(__APPLE__) || defined(__OpenBSD__) 53#ifdef __OpenBSD__ 54 int sels[2] = {CTL_MACHDEP, CPU_ALTIVEC}; 55#else 56 int sels[2] = {CTL_HW, HW_VECTORUNIT}; 57#endif 58 int has_vu = 0; 59 size_t len = sizeof(has_vu); 60 int err; 61 62 err = sysctl(sels, 2, &has_vu, &len, NULL, 0); 63 64 if (err == 0) return has_vu != 0; 65 return 0; 66#elif CONFIG_RUNTIME_CPUDETECT 67 int proc_ver; 68 // Support of mfspr PVR emulation added in Linux 2.6.17. 69 __asm__ volatile("mfspr %0, 287" : "=r" (proc_ver)); 70 proc_ver >>= 16; 71 if (proc_ver & 0x8000 || 72 proc_ver == 0x000c || 73 proc_ver == 0x0039 || proc_ver == 0x003c || 74 proc_ver == 0x0044 || proc_ver == 0x0045 || 75 proc_ver == 0x0070) 76 return 1; 77 return 0; 78#else 79 // Since we were compiled for AltiVec, just assume we have it 80 // until someone comes up with a proper way (not involving signal hacks). 81 return 1; 82#endif /* __AMIGAOS4__ */ 83} 84 85