| /* |
| * 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/param.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 |
| #ifdef PPC_FEATURE_ARCH_2_07 |
| if (buf[i + 1] & PPC_FEATURE_HAS_POWER8) |
| ret |= AV_CPU_FLAG_POWER8; |
| #endif |
| if (ret & AV_CPU_FLAG_VSX) |
| av_assert0(ret & AV_CPU_FLAG_ALTIVEC); |
| goto out; |
| } |
| } |
| } |
| |
| 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; |
| } |