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  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. #ifdef __APPLE__
  20. #include <sys/sysctl.h>
  21. #elif defined(__OpenBSD__)
  22. #include <sys/param.h>
  23. #include <sys/sysctl.h>
  24. #include <machine/cpu.h>
  25. #elif defined(__AMIGAOS4__)
  26. #include <exec/exec.h>
  27. #include <interfaces/exec.h>
  28. #include <proto/exec.h>
  29. #endif /* __APPLE__ */
  30.  
  31. #include "libavutil/cpu.h"
  32. #include "libavutil/cpu_internal.h"
  33. #include "config.h"
  34.  
  35. /**
  36.  * This function MAY rely on signal() or fork() in order to make sure AltiVec
  37.  * is present.
  38.  */
  39. int ff_get_cpu_flags_ppc(void)
  40. {
  41. #if HAVE_ALTIVEC
  42. #ifdef __AMIGAOS4__
  43.     ULONG result = 0;
  44.     extern struct ExecIFace *IExec;
  45.  
  46.     IExec->GetCPUInfoTags(GCIT_VectorUnit, &result, TAG_DONE);
  47.     if (result == VECTORTYPE_ALTIVEC)
  48.         return AV_CPU_FLAG_ALTIVEC;
  49.     return 0;
  50. #elif defined(__APPLE__) || defined(__OpenBSD__)
  51. #ifdef __OpenBSD__
  52.     int sels[2] = {CTL_MACHDEP, CPU_ALTIVEC};
  53. #else
  54.     int sels[2] = {CTL_HW, HW_VECTORUNIT};
  55. #endif
  56.     int has_vu = 0;
  57.     size_t len = sizeof(has_vu);
  58.     int err;
  59.  
  60.     err = sysctl(sels, 2, &has_vu, &len, NULL, 0);
  61.  
  62.     if (err == 0)
  63.         return has_vu ? AV_CPU_FLAG_ALTIVEC : 0;
  64.     return 0;
  65. #elif CONFIG_RUNTIME_CPUDETECT && defined(__linux__) && !ARCH_PPC64
  66.     int proc_ver;
  67.     // Support of mfspr PVR emulation added in Linux 2.6.17.
  68.     __asm__ volatile("mfspr %0, 287" : "=r" (proc_ver));
  69.     proc_ver >>= 16;
  70.     if (proc_ver  & 0x8000 ||
  71.         proc_ver == 0x000c ||
  72.         proc_ver == 0x0039 || proc_ver == 0x003c ||
  73.         proc_ver == 0x0044 || proc_ver == 0x0045 ||
  74.         proc_ver == 0x0070)
  75.         return AV_CPU_FLAG_ALTIVEC;
  76.     return 0;
  77. #else
  78.     // Since we were compiled for AltiVec, just assume we have it
  79.     // until someone comes up with a proper way (not involving signal hacks).
  80.     return AV_CPU_FLAG_ALTIVEC;
  81. #endif /* __AMIGAOS4__ */
  82. #endif /* HAVE_ALTIVEC */
  83.     return 0;
  84. }
  85.