aboutsummaryrefslogblamecommitdiffstats
path: root/libavutil/ppc/cpu.c
blob: 002571161a757458882902378dde4b2e0592e133 (plain) (tree)
1
2
3
4
5
6
7
8
9
  
                              
  
                                                         


                                                                     
                                                           



                                                                    
                                                               

                                                                               
                       
                          

                        
                           

                            
                      
                          
                   
 
   
                                                                             
   
                              
 
                



                                                              
                                     
             


                                                
                                          
      




                                                  
                                                
             
                              
                 
                                                            
                                                        




                                                   
                                   
             
     
                                                                 
                                                                             
                               
                         
                         
 
/*
 * This file is part of Libav.
 *
 * Libav is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * Libav is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifdef __APPLE__
#include <sys/sysctl.h>
#elif defined(__OpenBSD__)
#include <sys/param.h>
#include <sys/sysctl.h>
#include <machine/cpu.h>
#elif defined(__AMIGAOS4__)
#include <exec/exec.h>
#include <interfaces/exec.h>
#include <proto/exec.h>
#endif /* __APPLE__ */

#include "libavutil/cpu.h"
#include "config.h"

/**
 * This function MAY rely on signal() or fork() in order to make sure AltiVec
 * is present.
 */
int ff_get_cpu_flags_ppc(void)
{
#if HAVE_ALTIVEC
#ifdef __AMIGAOS4__
    ULONG result = 0;
    extern struct ExecIFace *IExec;

    IExec->GetCPUInfoTags(GCIT_VectorUnit, &result, TAG_DONE);
    if (result == VECTORTYPE_ALTIVEC)
        return AV_CPU_FLAG_ALTIVEC;
    return 0;
#elif defined(__APPLE__) || defined(__OpenBSD__)
#ifdef __OpenBSD__
    int sels[2] = {CTL_MACHDEP, CPU_ALTIVEC};
#else
    int sels[2] = {CTL_HW, HW_VECTORUNIT};
#endif
    int has_vu = 0;
    size_t len = sizeof(has_vu);
    int err;

    err = sysctl(sels, 2, &has_vu, &len, NULL, 0);

    if (err == 0)
        return has_vu ? AV_CPU_FLAG_ALTIVEC : 0;
    return 0;
#elif CONFIG_RUNTIME_CPUDETECT
    int proc_ver;
    // Support of mfspr PVR emulation added in Linux 2.6.17.
    __asm__ volatile("mfspr %0, 287" : "=r" (proc_ver));
    proc_ver >>= 16;
    if (proc_ver  & 0x8000 ||
        proc_ver == 0x000c ||
        proc_ver == 0x0039 || proc_ver == 0x003c ||
        proc_ver == 0x0044 || proc_ver == 0x0045 ||
        proc_ver == 0x0070)
        return AV_CPU_FLAG_ALTIVEC;
    return 0;
#else
    // Since we were compiled for AltiVec, just assume we have it
    // until someone comes up with a proper way (not involving signal hacks).
    return AV_CPU_FLAG_ALTIVEC;
#endif /* __AMIGAOS4__ */
#endif /* HAVE_ALTIVEC */
    return 0;
}