Statistics
| Branch: | Revision:

ffmpeg / libavcodec / ppc / check_altivec.c @ ccf22d3e

History | View | Annotate | Download (2.52 KB)

1
/*
2
 * This file is part of FFmpeg.
3
 *
4
 * FFmpeg is free software; you can redistribute it and/or
5
 * modify it under the terms of the GNU Lesser General Public
6
 * License as published by the Free Software Foundation; either
7
 * version 2.1 of the License, or (at your option) any later version.
8
 *
9
 * FFmpeg is distributed in the hope that it will be useful,
10
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12
 * Lesser General Public License for more details.
13
 *
14
 * You should have received a copy of the GNU Lesser General Public
15
 * License along with FFmpeg; if not, write to the Free Software
16
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17
 */
18

    
19

    
20
/**
21
 * @file
22
 * Check for AltiVec presence.
23
 */
24

    
25
#ifdef __APPLE__
26
#undef _POSIX_C_SOURCE
27
#include <sys/sysctl.h>
28
#elif defined(__OpenBSD__)
29
#include <sys/param.h>
30
#include <sys/sysctl.h>
31
#include <machine/cpu.h>
32
#elif defined(__AMIGAOS4__)
33
#include <exec/exec.h>
34
#include <interfaces/exec.h>
35
#include <proto/exec.h>
36
#endif /* __APPLE__ */
37

    
38
#include "config.h"
39
#include "dsputil_altivec.h"
40

    
41
/**
42
 * This function MAY rely on signal() or fork() in order to make sure AltiVec
43
 * is present.
44
 */
45

    
46
int mm_support(void)
47
{
48
#if HAVE_ALTIVEC
49
#ifdef __AMIGAOS4__
50
    ULONG result = 0;
51
    extern struct ExecIFace *IExec;
52

    
53
    IExec->GetCPUInfoTags(GCIT_VectorUnit, &result, TAG_DONE);
54
    if (result == VECTORTYPE_ALTIVEC)
55
        return AV_CPU_FLAG_ALTIVEC;
56
    return 0;
57
#elif defined(__APPLE__) || defined(__OpenBSD__)
58
#ifdef __OpenBSD__
59
    int sels[2] = {CTL_MACHDEP, CPU_ALTIVEC};
60
#else
61
    int sels[2] = {CTL_HW, HW_VECTORUNIT};
62
#endif
63
    int has_vu = 0;
64
    size_t len = sizeof(has_vu);
65
    int err;
66

    
67
    err = sysctl(sels, 2, &has_vu, &len, NULL, 0);
68

    
69
    if (err == 0)
70
        return has_vu ? AV_CPU_FLAG_ALTIVEC : 0;
71
    return 0;
72
#elif CONFIG_RUNTIME_CPUDETECT
73
    int proc_ver;
74
    // Support of mfspr PVR emulation added in Linux 2.6.17.
75
    __asm__ volatile("mfspr %0, 287" : "=r" (proc_ver));
76
    proc_ver >>= 16;
77
    if (proc_ver  & 0x8000 ||
78
        proc_ver == 0x000c ||
79
        proc_ver == 0x0039 || proc_ver == 0x003c ||
80
        proc_ver == 0x0044 || proc_ver == 0x0045 ||
81
        proc_ver == 0x0070)
82
        return AV_CPU_FLAG_ALTIVEC;
83
    return 0;
84
#else
85
    // Since we were compiled for AltiVec, just assume we have it
86
    // until someone comes up with a proper way (not involving signal hacks).
87
    return AV_CPU_FLAG_ALTIVEC;
88
#endif /* __AMIGAOS4__ */
89
#endif /* HAVE_ALTIVEC */
90
    return 0;
91
}
92