/* * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "config.h" #ifdef __APPLE__ #include <sys/sysctl.h> #elif defined(__linux__) #include <asm/cputable.h> #include <linux/auxvec.h> #include <fcntl.h> #if HAVE_UNISTD_H #include <unistd.h> #endif #elif defined(__OpenBSD__) #include <sys/types.h> #include <sys/sysctl.h> #include <machine/cpu.h> #elif defined(__AMIGAOS4__) #include <exec/exec.h> #include <interfaces/exec.h> #include <proto/exec.h> #endif /* __APPLE__ */ #include "libavutil/avassert.h" #include "libavutil/cpu.h" #include "libavutil/cpu_internal.h" /** * This function MAY rely on signal() or fork() in order to make sure AltiVec * is present. */ int ff_get_cpu_flags_ppc(void) { #if HAVE_ALTIVEC #ifdef __AMIGAOS4__ ULONG result = 0; extern struct ExecIFace *IExec; IExec->GetCPUInfoTags(GCIT_VectorUnit, &result, TAG_DONE); if (result == VECTORTYPE_ALTIVEC) return AV_CPU_FLAG_ALTIVEC; return 0; #elif defined(__APPLE__) || defined(__OpenBSD__) #ifdef __OpenBSD__ int sels[2] = {CTL_MACHDEP, CPU_ALTIVEC}; #else int sels[2] = {CTL_HW, HW_VECTORUNIT}; #endif int has_vu = 0; size_t len = sizeof(has_vu); int err; err = sysctl(sels, 2, &has_vu, &len, NULL, 0); if (err == 0) return has_vu ? AV_CPU_FLAG_ALTIVEC : 0; return 0; #elif defined(__linux__) // The linux kernel could have the altivec support disabled // even if the cpu has it. int i, ret = 0; int fd = open("/proc/self/auxv", O_RDONLY); unsigned long buf[64] = { 0 }; ssize_t count; if (fd < 0) return 0; while ((count = read(fd, buf, sizeof(buf))) > 0) { for (i = 0; i < count / sizeof(*buf); i += 2) { if (buf[i] == AT_NULL) goto out; if (buf[i] == AT_HWCAP) { if (buf[i + 1] & PPC_FEATURE_HAS_ALTIVEC) ret = AV_CPU_FLAG_ALTIVEC; #ifdef PPC_FEATURE_HAS_VSX if (buf[i + 1] & PPC_FEATURE_HAS_VSX) ret |= AV_CPU_FLAG_VSX; #endif if (ret & AV_CPU_FLAG_VSX) av_assert0(ret & AV_CPU_FLAG_ALTIVEC); } else if (buf[i] == AT_HWCAP2) { #ifdef PPC_FEATURE2_ARCH_2_07 if (buf[i + 1] & PPC_FEATURE2_ARCH_2_07) ret |= AV_CPU_FLAG_POWER8; #endif } } } out: close(fd); return ret; #elif CONFIG_RUNTIME_CPUDETECT && defined(__linux__) #define PVR_G4_7400 0x000C #define PVR_G5_970 0x0039 #define PVR_G5_970FX 0x003C #define PVR_G5_970MP 0x0044 #define PVR_G5_970GX 0x0045 #define PVR_POWER6 0x003E #define PVR_POWER7 0x003F #define PVR_POWER8 0x004B #define PVR_CELL_PPU 0x0070 int ret = 0; int proc_ver; // Support of mfspr PVR emulation added in Linux 2.6.17. __asm__ volatile("mfspr %0, 287" : "=r" (proc_ver)); proc_ver >>= 16; if (proc_ver & 0x8000 || proc_ver == PVR_G4_7400 || proc_ver == PVR_G5_970 || proc_ver == PVR_G5_970FX || proc_ver == PVR_G5_970MP || proc_ver == PVR_G5_970GX || proc_ver == PVR_POWER6 || proc_ver == PVR_POWER7 || proc_ver == PVR_POWER8 || proc_ver == PVR_CELL_PPU) ret = AV_CPU_FLAG_ALTIVEC; if (proc_ver == PVR_POWER7 || proc_ver == PVR_POWER8) ret |= AV_CPU_FLAG_VSX; if (proc_ver == PVR_POWER8) ret |= AV_CPU_FLAG_POWER8; return ret; #else // Since we were compiled for AltiVec, just assume we have it // until someone comes up with a proper way (not involving signal hacks). return AV_CPU_FLAG_ALTIVEC; #endif /* __AMIGAOS4__ */ #endif /* HAVE_ALTIVEC */ return 0; } size_t ff_get_cpu_max_align_ppc(void) { int flags = av_get_cpu_flags(); if (flags & (AV_CPU_FLAG_ALTIVEC | AV_CPU_FLAG_VSX | AV_CPU_FLAG_POWER8)) return 16; return 8; }