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
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
/*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#ifdef __APPLE__
#include <sys/sysctl.h>
#elif HAVE_GETAUXVAL || HAVE_ELF_AUX_INFO
#ifdef __FreeBSD__
#include <machine/cpu.h>
#endif
#include <sys/auxv.h>
#elif defined(__linux__)
#include <asm/cputable.h>
#include <linux/auxvec.h>
#include <fcntl.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#elif defined(__NetBSD__) || defined(__OpenBSD__)
#include <sys/types.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/avassert.h"
#include "libavutil/cpu.h"
#include "libavutil/cpu_internal.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 HAVE_GETAUXVAL || HAVE_ELF_AUX_INFO
int flags = 0;
unsigned long hwcap = ff_getauxval(AT_HWCAP);
#ifdef PPC_FEATURE2_ARCH_2_07
unsigned long hwcap2 = ff_getauxval(AT_HWCAP2);
#endif
if (hwcap & PPC_FEATURE_HAS_ALTIVEC)
flags |= AV_CPU_FLAG_ALTIVEC;
#ifdef PPC_FEATURE_HAS_VSX
if (hwcap & PPC_FEATURE_HAS_VSX)
flags |= AV_CPU_FLAG_VSX;
#endif
#ifdef PPC_FEATURE2_ARCH_2_07
if (hwcap2 & PPC_FEATURE2_ARCH_2_07)
flags |= AV_CPU_FLAG_POWER8;
#endif
return flags;
#elif defined(__APPLE__) || defined(__NetBSD__) || defined(__OpenBSD__)
#if defined(__NetBSD__) || defined(__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;
#ifdef PPC_FEATURE_HAS_VSX
if (buf[i + 1] & PPC_FEATURE_HAS_VSX)
ret |= AV_CPU_FLAG_VSX;
#endif
if (ret & AV_CPU_FLAG_VSX)
av_assert0(ret & AV_CPU_FLAG_ALTIVEC);
}
#ifdef AT_HWCAP2 /* not introduced until glibc 2.18 */
else if (buf[i] == AT_HWCAP2) {
#ifdef PPC_FEATURE2_ARCH_2_07
if (buf[i + 1] & PPC_FEATURE2_ARCH_2_07)
ret |= AV_CPU_FLAG_POWER8;
#endif
}
#endif /* AT_HWCAP2 */
}
}
out:
close(fd);
return ret;
#elif CONFIG_RUNTIME_CPUDETECT && defined(__linux__)
#define PVR_G4_7400 0x000C
#define PVR_G5_970 0x0039
#define PVR_G5_970FX 0x003C
#define PVR_G5_970MP 0x0044
#define PVR_G5_970GX 0x0045
#define PVR_POWER6 0x003E
#define PVR_POWER7 0x003F
#define PVR_POWER8 0x004B
#define PVR_CELL_PPU 0x0070
int ret = 0;
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 == PVR_G4_7400 ||
proc_ver == PVR_G5_970 ||
proc_ver == PVR_G5_970FX ||
proc_ver == PVR_G5_970MP ||
proc_ver == PVR_G5_970GX ||
proc_ver == PVR_POWER6 ||
proc_ver == PVR_POWER7 ||
proc_ver == PVR_POWER8 ||
proc_ver == PVR_CELL_PPU)
ret = AV_CPU_FLAG_ALTIVEC;
if (proc_ver == PVR_POWER7 ||
proc_ver == PVR_POWER8)
ret |= AV_CPU_FLAG_VSX;
if (proc_ver == PVR_POWER8)
ret |= AV_CPU_FLAG_POWER8;
return ret;
#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;
}
size_t ff_get_cpu_max_align_ppc(void)
{
int flags = av_get_cpu_flags();
if (flags & (AV_CPU_FLAG_ALTIVEC |
AV_CPU_FLAG_VSX |
AV_CPU_FLAG_POWER8))
return 16;
return 8;
}
|
