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#ifdef __APPLE__ 20#include <sys/sysctl.h> 21#elif defined(__OpenBSD__) 22#include <sys/param.h> 23#include <sys/sysctl.h> 24#include <machine/cpu.h> 25#elif defined(__AMIGAOS4__) 26#include <exec/exec.h> 27#include <interfaces/exec.h> 28#include <proto/exec.h> 29#endif /* __APPLE__ */ 30 31#include "libavutil/cpu.h" 32#include "libavutil/cpu_internal.h" 33#include "config.h" 34 35/** 36 * This function MAY rely on signal() or fork() in order to make sure AltiVec 37 * is present. 38 */ 39int ff_get_cpu_flags_ppc(void) 40{ 41#if HAVE_ALTIVEC 42#ifdef __AMIGAOS4__ 43 ULONG result = 0; 44 extern struct ExecIFace *IExec; 45 46 IExec->GetCPUInfoTags(GCIT_VectorUnit, &result, TAG_DONE); 47 if (result == VECTORTYPE_ALTIVEC) 48 return AV_CPU_FLAG_ALTIVEC; 49 return 0; 50#elif defined(__APPLE__) || defined(__OpenBSD__) 51#ifdef __OpenBSD__ 52 int sels[2] = {CTL_MACHDEP, CPU_ALTIVEC}; 53#else 54 int sels[2] = {CTL_HW, HW_VECTORUNIT}; 55#endif 56 int has_vu = 0; 57 size_t len = sizeof(has_vu); 58 int err; 59 60 err = sysctl(sels, 2, &has_vu, &len, NULL, 0); 61 62 if (err == 0) 63 return has_vu ? AV_CPU_FLAG_ALTIVEC : 0; 64 return 0; 65#elif CONFIG_RUNTIME_CPUDETECT && defined(__linux__) && !ARCH_PPC64 66 int proc_ver; 67 // Support of mfspr PVR emulation added in Linux 2.6.17. 68 __asm__ volatile("mfspr %0, 287" : "=r" (proc_ver)); 69 proc_ver >>= 16; 70 if (proc_ver & 0x8000 || 71 proc_ver == 0x000c || 72 proc_ver == 0x0039 || proc_ver == 0x003c || 73 proc_ver == 0x0044 || proc_ver == 0x0045 || 74 proc_ver == 0x0070) 75 return AV_CPU_FLAG_ALTIVEC; 76 return 0; 77#else 78 // Since we were compiled for AltiVec, just assume we have it 79 // until someone comes up with a proper way (not involving signal hacks). 80 return AV_CPU_FLAG_ALTIVEC; 81#endif /* __AMIGAOS4__ */ 82#endif /* HAVE_ALTIVEC */ 83 return 0; 84} 85