forked from KolibriOS/kolibrios
151 lines
4.3 KiB
C
151 lines
4.3 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "config.h"
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#ifdef __APPLE__
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#include <sys/sysctl.h>
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#elif defined(__linux__)
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#include <asm/cputable.h>
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#include <linux/auxvec.h>
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#include <fcntl.h>
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#elif defined(__OpenBSD__)
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#include <sys/param.h>
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#include <sys/sysctl.h>
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#include <machine/cpu.h>
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#elif defined(__AMIGAOS4__)
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#include <exec/exec.h>
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#include <interfaces/exec.h>
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#include <proto/exec.h>
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#endif /* __APPLE__ */
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#include "libavutil/avassert.h"
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#include "libavutil/cpu.h"
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#include "libavutil/cpu_internal.h"
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/**
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* This function MAY rely on signal() or fork() in order to make sure AltiVec
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* is present.
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*/
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int ff_get_cpu_flags_ppc(void)
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{
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#if HAVE_ALTIVEC
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#ifdef __AMIGAOS4__
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ULONG result = 0;
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extern struct ExecIFace *IExec;
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IExec->GetCPUInfoTags(GCIT_VectorUnit, &result, TAG_DONE);
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if (result == VECTORTYPE_ALTIVEC)
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return AV_CPU_FLAG_ALTIVEC;
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return 0;
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#elif defined(__APPLE__) || defined(__OpenBSD__)
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#ifdef __OpenBSD__
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int sels[2] = {CTL_MACHDEP, CPU_ALTIVEC};
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#else
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int sels[2] = {CTL_HW, HW_VECTORUNIT};
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#endif
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int has_vu = 0;
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size_t len = sizeof(has_vu);
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int err;
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err = sysctl(sels, 2, &has_vu, &len, NULL, 0);
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if (err == 0)
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return has_vu ? AV_CPU_FLAG_ALTIVEC : 0;
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return 0;
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#elif defined(__linux__)
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// The linux kernel could have the altivec support disabled
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// even if the cpu has it.
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int i, ret = 0;
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int fd = open("/proc/self/auxv", O_RDONLY);
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unsigned long buf[64] = { 0 };
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ssize_t count;
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if (fd < 0)
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return 0;
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while ((count = read(fd, buf, sizeof(buf))) > 0) {
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for (i = 0; i < count / sizeof(*buf); i += 2) {
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if (buf[i] == AT_NULL)
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goto out;
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if (buf[i] == AT_HWCAP) {
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if (buf[i + 1] & PPC_FEATURE_HAS_ALTIVEC)
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ret = AV_CPU_FLAG_ALTIVEC;
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#ifdef PPC_FEATURE_HAS_VSX
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if (buf[i + 1] & PPC_FEATURE_HAS_VSX)
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ret |= AV_CPU_FLAG_VSX;
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#endif
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#ifdef PPC_FEATURE_ARCH_2_07
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if (buf[i + 1] & PPC_FEATURE_HAS_POWER8)
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ret |= AV_CPU_FLAG_POWER8;
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#endif
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if (ret & AV_CPU_FLAG_VSX)
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av_assert0(ret & AV_CPU_FLAG_ALTIVEC);
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goto out;
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}
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}
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}
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out:
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close(fd);
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return ret;
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#elif CONFIG_RUNTIME_CPUDETECT && defined(__linux__)
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#define PVR_G4_7400 0x000C
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#define PVR_G5_970 0x0039
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#define PVR_G5_970FX 0x003C
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#define PVR_G5_970MP 0x0044
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#define PVR_G5_970GX 0x0045
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#define PVR_POWER6 0x003E
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#define PVR_POWER7 0x003F
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#define PVR_POWER8 0x004B
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#define PVR_CELL_PPU 0x0070
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int ret = 0;
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int proc_ver;
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// Support of mfspr PVR emulation added in Linux 2.6.17.
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__asm__ volatile("mfspr %0, 287" : "=r" (proc_ver));
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proc_ver >>= 16;
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if (proc_ver & 0x8000 ||
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proc_ver == PVR_G4_7400 ||
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proc_ver == PVR_G5_970 ||
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proc_ver == PVR_G5_970FX ||
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proc_ver == PVR_G5_970MP ||
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proc_ver == PVR_G5_970GX ||
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proc_ver == PVR_POWER6 ||
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proc_ver == PVR_POWER7 ||
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proc_ver == PVR_POWER8 ||
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proc_ver == PVR_CELL_PPU)
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ret = AV_CPU_FLAG_ALTIVEC;
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if (proc_ver == PVR_POWER7 ||
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proc_ver == PVR_POWER8)
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ret |= AV_CPU_FLAG_VSX;
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if (proc_ver == PVR_POWER8)
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ret |= AV_CPU_FLAG_POWER8;
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return ret;
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#else
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// Since we were compiled for AltiVec, just assume we have it
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// until someone comes up with a proper way (not involving signal hacks).
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return AV_CPU_FLAG_ALTIVEC;
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#endif /* __AMIGAOS4__ */
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#endif /* HAVE_ALTIVEC */
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return 0;
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}
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