1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
|
/*
* 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(__linux__)
#include <asm/cputable.h>
#include <linux/auxvec.h>
#include <fcntl.h>
#include <unistd.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 "libavutil/cpu_internal.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 defined(__linux__)
// The linux kernel could have the altivec support disabled
// even if the cpu has it.
int i, ret = 0;
int fd = open("/proc/self/auxv", O_RDONLY);
unsigned long buf[64] = { 0 };
ssize_t count;
if (fd < 0)
return 0;
while ((count = read(fd, buf, sizeof(buf))) > 0) {
for (i = 0; i < count / sizeof(*buf); i += 2) {
if (buf[i] == AT_NULL)
goto out;
if (buf[i] == AT_HWCAP) {
if (buf[i + 1] & PPC_FEATURE_HAS_ALTIVEC)
ret = AV_CPU_FLAG_ALTIVEC;
goto out;
}
}
}
out:
close(fd);
return ret;
#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;
}
|
