Add necessary header for CONFIG_RUNTIME_CPUDETECT preprocessor definition.
[libav.git] / libavcodec / ppc / check_altivec.c
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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/**
bad5537e 21 * @file libavcodec/ppc/check_altivec.c
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22 * Checks for AltiVec presence.
23 */
24
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25#include "config.h"
26
89523bee 27#ifdef __APPLE__
7f0d242b 28#undef _POSIX_C_SOURCE
89523bee 29#include <sys/sysctl.h>
67a7e4db 30#elif defined(__OpenBSD__)
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31#include <sys/param.h>
32#include <sys/sysctl.h>
33#include <machine/cpu.h>
67a7e4db 34#elif defined(__AMIGAOS4__)
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35#include <exec/exec.h>
36#include <interfaces/exec.h>
37#include <proto/exec.h>
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38#endif /* __APPLE__ */
39
40/**
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41 * This function MAY rely on signal() or fork() in order to make sure AltiVec
42 * is present.
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43 */
44
45int has_altivec(void)
46{
47#ifdef __AMIGAOS4__
48 ULONG result = 0;
49 extern struct ExecIFace *IExec;
50
51 IExec->GetCPUInfoTags(GCIT_VectorUnit, &result, TAG_DONE);
52 if (result == VECTORTYPE_ALTIVEC) return 1;
53 return 0;
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54#elif defined(__APPLE__) || defined(__OpenBSD__)
55#ifdef __OpenBSD__
56 int sels[2] = {CTL_MACHDEP, CPU_ALTIVEC};
57#else
89523bee 58 int sels[2] = {CTL_HW, HW_VECTORUNIT};
acce61a7 59#endif
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60 int has_vu = 0;
61 size_t len = sizeof(has_vu);
62 int err;
63
64 err = sysctl(sels, 2, &has_vu, &len, NULL, 0);
65
ccd425e7 66 if (err == 0) return has_vu != 0;
89523bee 67 return 0;
e90f5b5a 68#elif CONFIG_RUNTIME_CPUDETECT
b8659d94 69 int proc_ver;
8556ea03 70 // Support of mfspr PVR emulation added in Linux 2.6.17.
be449fca 71 __asm__ volatile("mfspr %0, 287" : "=r" (proc_ver));
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72 proc_ver >>= 16;
73 if (proc_ver & 0x8000 ||
74 proc_ver == 0x000c ||
75 proc_ver == 0x0039 || proc_ver == 0x003c ||
76 proc_ver == 0x0044 || proc_ver == 0x0045 ||
77 proc_ver == 0x0070)
78 return 1;
79 return 0;
89523bee 80#else
8556ea03 81 // Since we were compiled for AltiVec, just assume we have it
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82 // until someone comes up with a proper way (not involving signal hacks).
83 return 1;
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84#endif /* __AMIGAOS4__ */
85}
86