yading@11: /*
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #ifdef __APPLE__
yading@11: #include <sys/sysctl.h>
yading@11: #elif defined(__OpenBSD__)
yading@11: #include <sys/param.h>
yading@11: #include <sys/sysctl.h>
yading@11: #include <machine/cpu.h>
yading@11: #elif defined(__AMIGAOS4__)
yading@11: #include <exec/exec.h>
yading@11: #include <interfaces/exec.h>
yading@11: #include <proto/exec.h>
yading@11: #endif /* __APPLE__ */
yading@11: 
yading@11: #include "libavutil/cpu.h"
yading@11: #include "config.h"
yading@11: 
yading@11: /**
yading@11:  * This function MAY rely on signal() or fork() in order to make sure AltiVec
yading@11:  * is present.
yading@11:  */
yading@11: int ff_get_cpu_flags_ppc(void)
yading@11: {
yading@11: #if HAVE_ALTIVEC
yading@11: #ifdef __AMIGAOS4__
yading@11:     ULONG result = 0;
yading@11:     extern struct ExecIFace *IExec;
yading@11: 
yading@11:     IExec->GetCPUInfoTags(GCIT_VectorUnit, &result, TAG_DONE);
yading@11:     if (result == VECTORTYPE_ALTIVEC)
yading@11:         return AV_CPU_FLAG_ALTIVEC;
yading@11:     return 0;
yading@11: #elif defined(__APPLE__) || defined(__OpenBSD__)
yading@11: #ifdef __OpenBSD__
yading@11:     int sels[2] = {CTL_MACHDEP, CPU_ALTIVEC};
yading@11: #else
yading@11:     int sels[2] = {CTL_HW, HW_VECTORUNIT};
yading@11: #endif
yading@11:     int has_vu = 0;
yading@11:     size_t len = sizeof(has_vu);
yading@11:     int err;
yading@11: 
yading@11:     err = sysctl(sels, 2, &has_vu, &len, NULL, 0);
yading@11: 
yading@11:     if (err == 0)
yading@11:         return has_vu ? AV_CPU_FLAG_ALTIVEC : 0;
yading@11:     return 0;
yading@11: #elif CONFIG_RUNTIME_CPUDETECT && defined(__linux__) && !ARCH_PPC64
yading@11:     int proc_ver;
yading@11:     // Support of mfspr PVR emulation added in Linux 2.6.17.
yading@11:     __asm__ volatile("mfspr %0, 287" : "=r" (proc_ver));
yading@11:     proc_ver >>= 16;
yading@11:     if (proc_ver  & 0x8000 ||
yading@11:         proc_ver == 0x000c ||
yading@11:         proc_ver == 0x0039 || proc_ver == 0x003c ||
yading@11:         proc_ver == 0x0044 || proc_ver == 0x0045 ||
yading@11:         proc_ver == 0x0070)
yading@11:         return AV_CPU_FLAG_ALTIVEC;
yading@11:     return 0;
yading@11: #else
yading@11:     // Since we were compiled for AltiVec, just assume we have it
yading@11:     // until someone comes up with a proper way (not involving signal hacks).
yading@11:     return AV_CPU_FLAG_ALTIVEC;
yading@11: #endif /* __AMIGAOS4__ */
yading@11: #endif /* HAVE_ALTIVEC */
yading@11:     return 0;
yading@11: }