/* * 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 HAVE_GETAUXVAL || HAVE_ELF_AUX_INFO#ifdef __FreeBSD__#include <machine/cpu.h>#endif#include <sys/auxv.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(__NetBSD__) || 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" #ifndef AT_HWCAP#define AT_HWCAP             16#endif#ifndef AT_HWCAP2#define AT_HWCAP2            26#endif #define HWCAP_PPC_VSX        (1U << 7)#define HWCAP_PPC_ALTIVEC    (1U << 28)#define HWCAP2_PPC_ARCH_2_07 (1U << 31) /** * 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 HAVE_GETAUXVAL || HAVE_ELF_AUX_INFO    int flags = 0;     unsigned long hwcap = ff_getauxval(AT_HWCAP);    unsigned long hwcap2 = ff_getauxval(AT_HWCAP2);     if (hwcap & HWCAP_PPC_ALTIVEC)       flags |= AV_CPU_FLAG_ALTIVEC;    if (hwcap & HWCAP_PPC_VSX)       flags |= AV_CPU_FLAG_VSX;    if (hwcap2 & HWCAP2_PPC_ARCH_2_07)       flags |= AV_CPU_FLAG_POWER8;     return flags;#elif defined(__APPLE__) || defined(__NetBSD__) || defined(__OpenBSD__)#if defined(__NetBSD__) || defined(__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] & HWCAP_PPC_ALTIVEC)                    ret = AV_CPU_FLAG_ALTIVEC;                if (buf[i + 1] & HWCAP_PPC_VSX)                    ret |= AV_CPU_FLAG_VSX;                if (ret & AV_CPU_FLAG_VSX)                    av_assert0(ret & AV_CPU_FLAG_ALTIVEC);            }            else if (buf[i] == AT_HWCAP2) {                if (buf[i + 1] & HWCAP2_PPC_ARCH_2_07)                    ret |= AV_CPU_FLAG_POWER8;            }        }    } 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;}