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#include "config.h" 20 21#ifdef __APPLE__ 22#include <sys/sysctl.h> 23#elif defined(__linux__) 24#include <asm/cputable.h> 25#include <linux/auxvec.h> 26#include <fcntl.h> 27#if HAVE_UNISTD_H 28#include <unistd.h> 29#endif 30#elif defined(__OpenBSD__) 31#include <sys/types.h> 32#include <sys/sysctl.h> 33#include <machine/cpu.h> 34#elif defined(__AMIGAOS4__) 35#include <exec/exec.h> 36#include <interfaces/exec.h> 37#include <proto/exec.h> 38#endif /* __APPLE__ */ 39 40#include "libavutil/avassert.h" 41#include "libavutil/cpu.h" 42#include "libavutil/cpu_internal.h" 43 44/** 45 * This function MAY rely on signal() or fork() in order to make sure AltiVec 46 * is present. 47 */ 48int ff_get_cpu_flags_ppc(void) 49{ 50#if HAVE_ALTIVEC 51#ifdef __AMIGAOS4__ 52 ULONG result = 0; 53 extern struct ExecIFace *IExec; 54 55 IExec->GetCPUInfoTags(GCIT_VectorUnit, &result, TAG_DONE); 56 if (result == VECTORTYPE_ALTIVEC) 57 return AV_CPU_FLAG_ALTIVEC; 58 return 0; 59#elif defined(__APPLE__) || defined(__OpenBSD__) 60#ifdef __OpenBSD__ 61 int sels[2] = {CTL_MACHDEP, CPU_ALTIVEC}; 62#else 63 int sels[2] = {CTL_HW, HW_VECTORUNIT}; 64#endif 65 int has_vu = 0; 66 size_t len = sizeof(has_vu); 67 int err; 68 69 err = sysctl(sels, 2, &has_vu, &len, NULL, 0); 70 71 if (err == 0) 72 return has_vu ? AV_CPU_FLAG_ALTIVEC : 0; 73 return 0; 74#elif defined(__linux__) 75 // The linux kernel could have the altivec support disabled 76 // even if the cpu has it. 77 int i, ret = 0; 78 int fd = open("/proc/self/auxv", O_RDONLY); 79 unsigned long buf[64] = { 0 }; 80 ssize_t count; 81 82 if (fd < 0) 83 return 0; 84 85 while ((count = read(fd, buf, sizeof(buf))) > 0) { 86 for (i = 0; i < count / sizeof(*buf); i += 2) { 87 if (buf[i] == AT_NULL) 88 goto out; 89 if (buf[i] == AT_HWCAP) { 90 if (buf[i + 1] & PPC_FEATURE_HAS_ALTIVEC) 91 ret = AV_CPU_FLAG_ALTIVEC; 92#ifdef PPC_FEATURE_HAS_VSX 93 if (buf[i + 1] & PPC_FEATURE_HAS_VSX) 94 ret |= AV_CPU_FLAG_VSX; 95#endif 96 if (ret & AV_CPU_FLAG_VSX) 97 av_assert0(ret & AV_CPU_FLAG_ALTIVEC); 98 } 99#ifdef AT_HWCAP2 /* not introduced until glibc 2.18 */ 100 else if (buf[i] == AT_HWCAP2) { 101#ifdef PPC_FEATURE2_ARCH_2_07 102 if (buf[i + 1] & PPC_FEATURE2_ARCH_2_07) 103 ret |= AV_CPU_FLAG_POWER8; 104#endif 105 } 106#endif /* AT_HWCAP2 */ 107 } 108 } 109 110out: 111 close(fd); 112 return ret; 113#elif CONFIG_RUNTIME_CPUDETECT && defined(__linux__) 114#define PVR_G4_7400 0x000C 115#define PVR_G5_970 0x0039 116#define PVR_G5_970FX 0x003C 117#define PVR_G5_970MP 0x0044 118#define PVR_G5_970GX 0x0045 119#define PVR_POWER6 0x003E 120#define PVR_POWER7 0x003F 121#define PVR_POWER8 0x004B 122#define PVR_CELL_PPU 0x0070 123 int ret = 0; 124 int proc_ver; 125 // Support of mfspr PVR emulation added in Linux 2.6.17. 126 __asm__ volatile("mfspr %0, 287" : "=r" (proc_ver)); 127 proc_ver >>= 16; 128 if (proc_ver & 0x8000 || 129 proc_ver == PVR_G4_7400 || 130 proc_ver == PVR_G5_970 || 131 proc_ver == PVR_G5_970FX || 132 proc_ver == PVR_G5_970MP || 133 proc_ver == PVR_G5_970GX || 134 proc_ver == PVR_POWER6 || 135 proc_ver == PVR_POWER7 || 136 proc_ver == PVR_POWER8 || 137 proc_ver == PVR_CELL_PPU) 138 ret = AV_CPU_FLAG_ALTIVEC; 139 if (proc_ver == PVR_POWER7 || 140 proc_ver == PVR_POWER8) 141 ret |= AV_CPU_FLAG_VSX; 142 if (proc_ver == PVR_POWER8) 143 ret |= AV_CPU_FLAG_POWER8; 144 145 return ret; 146#else 147 // Since we were compiled for AltiVec, just assume we have it 148 // until someone comes up with a proper way (not involving signal hacks). 149 return AV_CPU_FLAG_ALTIVEC; 150#endif /* __AMIGAOS4__ */ 151#endif /* HAVE_ALTIVEC */ 152 return 0; 153} 154 155size_t ff_get_cpu_max_align_ppc(void) 156{ 157 int flags = av_get_cpu_flags(); 158 159 if (flags & (AV_CPU_FLAG_ALTIVEC | 160 AV_CPU_FLAG_VSX | 161 AV_CPU_FLAG_POWER8)) 162 return 16; 163 164 return 8; 165} 166