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 #include "config.h"
20
21 #ifdef __APPLE__
22 #include <sys/sysctl.h>
23 #elif defined(__linux__)
24 #include <asm/cputable.h>
25 #include <linux/auxvec.h>
26 #include <fcntl.h>
27 #if HAVE_UNISTD_H
28 #include <unistd.h>
29 #endif
30 #elif defined(__OpenBSD__)
31 #include <sys/param.h>
32 #include <sys/sysctl.h>
33 #include <machine/cpu.h>
34 #elif defined(__AMIGAOS4__)
35 #include <exec/exec.h>
36 #include <interfaces/exec.h>
37 #include <proto/exec.h>
38 #endif /* __APPLE__ */
39
40 #include "libavutil/avassert.h"
41 #include "libavutil/cpu.h"
42 #include "libavutil/cpu_internal.h"
43
44 /**
45 * This function MAY rely on signal() or fork() in order to make sure AltiVec
46 * is present.
47 */
ff_get_cpu_flags_ppc(void)48 int ff_get_cpu_flags_ppc(void)
49 {
50 #if HAVE_ALTIVEC
51 #ifdef __AMIGAOS4__
52 ULONG result = 0;
53 extern struct ExecIFace *IExec;
54
55 IExec->GetCPUInfoTags(GCIT_VectorUnit, &result, TAG_DONE);
56 if (result == VECTORTYPE_ALTIVEC)
57 return AV_CPU_FLAG_ALTIVEC;
58 return 0;
59 #elif defined(__APPLE__) || defined(__OpenBSD__)
60 #ifdef __OpenBSD__
61 int sels[2] = {CTL_MACHDEP, CPU_ALTIVEC};
62 #else
63 int sels[2] = {CTL_HW, HW_VECTORUNIT};
64 #endif
65 int has_vu = 0;
66 size_t len = sizeof(has_vu);
67 int err;
68
69 err = sysctl(sels, 2, &has_vu, &len, NULL, 0);
70
71 if (err == 0)
72 return has_vu ? AV_CPU_FLAG_ALTIVEC : 0;
73 return 0;
74 #elif defined(__linux__)
75 // The linux kernel could have the altivec support disabled
76 // even if the cpu has it.
77 int i, ret = 0;
78 int fd = open("/proc/self/auxv", O_RDONLY);
79 unsigned long buf[64] = { 0 };
80 ssize_t count;
81
82 if (fd < 0)
83 return 0;
84
85 while ((count = read(fd, buf, sizeof(buf))) > 0) {
86 for (i = 0; i < count / sizeof(*buf); i += 2) {
87 if (buf[i] == AT_NULL)
88 goto out;
89 if (buf[i] == AT_HWCAP) {
90 if (buf[i + 1] & PPC_FEATURE_HAS_ALTIVEC)
91 ret = AV_CPU_FLAG_ALTIVEC;
92 #ifdef PPC_FEATURE_HAS_VSX
93 if (buf[i + 1] & PPC_FEATURE_HAS_VSX)
94 ret |= AV_CPU_FLAG_VSX;
95 #endif
96 if (ret & AV_CPU_FLAG_VSX)
97 av_assert0(ret & AV_CPU_FLAG_ALTIVEC);
98 } else if (buf[i] == AT_HWCAP2) {
99 #ifdef PPC_FEATURE2_ARCH_2_07
100 if (buf[i + 1] & PPC_FEATURE2_ARCH_2_07)
101 ret |= AV_CPU_FLAG_POWER8;
102 #endif
103 }
104 }
105 }
106
107 out:
108 close(fd);
109 return ret;
110 #elif CONFIG_RUNTIME_CPUDETECT && defined(__linux__)
111 #define PVR_G4_7400 0x000C
112 #define PVR_G5_970 0x0039
113 #define PVR_G5_970FX 0x003C
114 #define PVR_G5_970MP 0x0044
115 #define PVR_G5_970GX 0x0045
116 #define PVR_POWER6 0x003E
117 #define PVR_POWER7 0x003F
118 #define PVR_POWER8 0x004B
119 #define PVR_CELL_PPU 0x0070
120 int ret = 0;
121 int proc_ver;
122 // Support of mfspr PVR emulation added in Linux 2.6.17.
123 __asm__ volatile("mfspr %0, 287" : "=r" (proc_ver));
124 proc_ver >>= 16;
125 if (proc_ver & 0x8000 ||
126 proc_ver == PVR_G4_7400 ||
127 proc_ver == PVR_G5_970 ||
128 proc_ver == PVR_G5_970FX ||
129 proc_ver == PVR_G5_970MP ||
130 proc_ver == PVR_G5_970GX ||
131 proc_ver == PVR_POWER6 ||
132 proc_ver == PVR_POWER7 ||
133 proc_ver == PVR_POWER8 ||
134 proc_ver == PVR_CELL_PPU)
135 ret = AV_CPU_FLAG_ALTIVEC;
136 if (proc_ver == PVR_POWER7 ||
137 proc_ver == PVR_POWER8)
138 ret |= AV_CPU_FLAG_VSX;
139 if (proc_ver == PVR_POWER8)
140 ret |= AV_CPU_FLAG_POWER8;
141
142 return ret;
143 #else
144 // Since we were compiled for AltiVec, just assume we have it
145 // until someone comes up with a proper way (not involving signal hacks).
146 return AV_CPU_FLAG_ALTIVEC;
147 #endif /* __AMIGAOS4__ */
148 #endif /* HAVE_ALTIVEC */
149 return 0;
150 }
151
ff_get_cpu_max_align_ppc(void)152 size_t ff_get_cpu_max_align_ppc(void)
153 {
154 int flags = av_get_cpu_flags();
155
156 if (flags & (AV_CPU_FLAG_ALTIVEC |
157 AV_CPU_FLAG_VSX |
158 AV_CPU_FLAG_POWER8))
159 return 16;
160
161 return 8;
162 }
163