libavutil/ppc/cpu.c
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00001 /*
00002  * This file is part of FFmpeg.
00003  *
00004  * FFmpeg is free software; you can redistribute it and/or
00005  * modify it under the terms of the GNU Lesser General Public
00006  * License as published by the Free Software Foundation; either
00007  * version 2.1 of the License, or (at your option) any later version.
00008  *
00009  * FFmpeg is distributed in the hope that it will be useful,
00010  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00011  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012  * Lesser General Public License for more details.
00013  *
00014  * You should have received a copy of the GNU Lesser General Public
00015  * License along with FFmpeg; if not, write to the Free Software
00016  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00017  */
00018 
00019 #ifdef __APPLE__
00020 #include <sys/sysctl.h>
00021 #elif defined(__OpenBSD__)
00022 #include <sys/param.h>
00023 #include <sys/sysctl.h>
00024 #include <machine/cpu.h>
00025 #elif defined(__AMIGAOS4__)
00026 #include <exec/exec.h>
00027 #include <interfaces/exec.h>
00028 #include <proto/exec.h>
00029 #endif /* __APPLE__ */
00030 
00031 #include "libavutil/cpu.h"
00032 #include "config.h"
00033 
00038 int ff_get_cpu_flags_ppc(void)
00039 {
00040 #if HAVE_ALTIVEC
00041 #ifdef __AMIGAOS4__
00042     ULONG result = 0;
00043     extern struct ExecIFace *IExec;
00044 
00045     IExec->GetCPUInfoTags(GCIT_VectorUnit, &result, TAG_DONE);
00046     if (result == VECTORTYPE_ALTIVEC)
00047         return AV_CPU_FLAG_ALTIVEC;
00048     return 0;
00049 #elif defined(__APPLE__) || defined(__OpenBSD__)
00050 #ifdef __OpenBSD__
00051     int sels[2] = {CTL_MACHDEP, CPU_ALTIVEC};
00052 #else
00053     int sels[2] = {CTL_HW, HW_VECTORUNIT};
00054 #endif
00055     int has_vu = 0;
00056     size_t len = sizeof(has_vu);
00057     int err;
00058 
00059     err = sysctl(sels, 2, &has_vu, &len, NULL, 0);
00060 
00061     if (err == 0)
00062         return has_vu ? AV_CPU_FLAG_ALTIVEC : 0;
00063     return 0;
00064 #elif CONFIG_RUNTIME_CPUDETECT
00065     int proc_ver;
00066     // Support of mfspr PVR emulation added in Linux 2.6.17.
00067     __asm__ volatile("mfspr %0, 287" : "=r" (proc_ver));
00068     proc_ver >>= 16;
00069     if (proc_ver  & 0x8000 ||
00070         proc_ver == 0x000c ||
00071         proc_ver == 0x0039 || proc_ver == 0x003c ||
00072         proc_ver == 0x0044 || proc_ver == 0x0045 ||
00073         proc_ver == 0x0070)
00074         return AV_CPU_FLAG_ALTIVEC;
00075     return 0;
00076 #else
00077     // Since we were compiled for AltiVec, just assume we have it
00078     // until someone comes up with a proper way (not involving signal hacks).
00079     return AV_CPU_FLAG_ALTIVEC;
00080 #endif /* __AMIGAOS4__ */
00081 #endif /* HAVE_ALTIVEC */
00082     return 0;
00083 }