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ffmpeg / libavcodec / ppc / check_altivec.c @ e90f5b5a

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/*
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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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/**
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 * @file libavcodec/ppc/check_altivec.c
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 * Checks for AltiVec presence.
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 */
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#ifdef __APPLE__
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#undef _POSIX_C_SOURCE
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#include <sys/sysctl.h>
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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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/**
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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 has_altivec(void)
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{
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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) return 1;
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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) return has_vu != 0;
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    return 0;
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#elif CONFIG_RUNTIME_CPUDETECT
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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 == 0x000c ||
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        proc_ver == 0x0039 || proc_ver == 0x003c ||
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        proc_ver == 0x0044 || proc_ver == 0x0045 ||
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        proc_ver == 0x0070)
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        return 1;
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    return 0;
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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 1;
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#endif /* __AMIGAOS4__ */
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}
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