cpu.c 2.5 KB

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