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2ba45a60 DM |
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 | #ifdef __APPLE__ | |
20 | #include <sys/sysctl.h> | |
21 | #elif defined(__OpenBSD__) | |
22 | #include <sys/param.h> | |
23 | #include <sys/sysctl.h> | |
24 | #include <machine/cpu.h> | |
25 | #elif defined(__AMIGAOS4__) | |
26 | #include <exec/exec.h> | |
27 | #include <interfaces/exec.h> | |
28 | #include <proto/exec.h> | |
29 | #endif /* __APPLE__ */ | |
30 | ||
31 | #include "libavutil/cpu.h" | |
32 | #include "libavutil/cpu_internal.h" | |
33 | #include "config.h" | |
34 | ||
35 | /** | |
36 | * This function MAY rely on signal() or fork() in order to make sure AltiVec | |
37 | * is present. | |
38 | */ | |
39 | int ff_get_cpu_flags_ppc(void) | |
40 | { | |
41 | #if HAVE_ALTIVEC | |
42 | #ifdef __AMIGAOS4__ | |
43 | ULONG result = 0; | |
44 | extern struct ExecIFace *IExec; | |
45 | ||
46 | IExec->GetCPUInfoTags(GCIT_VectorUnit, &result, TAG_DONE); | |
47 | if (result == VECTORTYPE_ALTIVEC) | |
48 | return AV_CPU_FLAG_ALTIVEC; | |
49 | return 0; | |
50 | #elif defined(__APPLE__) || defined(__OpenBSD__) | |
51 | #ifdef __OpenBSD__ | |
52 | int sels[2] = {CTL_MACHDEP, CPU_ALTIVEC}; | |
53 | #else | |
54 | int sels[2] = {CTL_HW, HW_VECTORUNIT}; | |
55 | #endif | |
56 | int has_vu = 0; | |
57 | size_t len = sizeof(has_vu); | |
58 | int err; | |
59 | ||
60 | err = sysctl(sels, 2, &has_vu, &len, NULL, 0); | |
61 | ||
62 | if (err == 0) | |
63 | return has_vu ? AV_CPU_FLAG_ALTIVEC : 0; | |
64 | return 0; | |
65 | #elif CONFIG_RUNTIME_CPUDETECT && defined(__linux__) && !ARCH_PPC64 | |
66 | int proc_ver; | |
67 | // Support of mfspr PVR emulation added in Linux 2.6.17. | |
68 | __asm__ volatile("mfspr %0, 287" : "=r" (proc_ver)); | |
69 | proc_ver >>= 16; | |
70 | if (proc_ver & 0x8000 || | |
71 | proc_ver == 0x000c || | |
72 | proc_ver == 0x0039 || proc_ver == 0x003c || | |
73 | proc_ver == 0x0044 || proc_ver == 0x0045 || | |
74 | proc_ver == 0x0070) | |
75 | return AV_CPU_FLAG_ALTIVEC; | |
76 | return 0; | |
77 | #else | |
78 | // Since we were compiled for AltiVec, just assume we have it | |
79 | // until someone comes up with a proper way (not involving signal hacks). | |
80 | return AV_CPU_FLAG_ALTIVEC; | |
81 | #endif /* __AMIGAOS4__ */ | |
82 | #endif /* HAVE_ALTIVEC */ | |
83 | return 0; | |
84 | } |