text: /*
   * 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;
  }
  