2 * This file is part of FFmpeg.
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.
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.
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
22 #include <sys/sysctl.h>
23 #elif defined(__linux__)
24 #include <asm/cputable.h>
25 #include <linux/auxvec.h>
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__ */
40 #include "libavutil/cpu.h"
41 #include "libavutil/cpu_internal.h"
44 * This function MAY rely on signal() or fork() in order to make sure AltiVec
47 int ff_get_cpu_flags_ppc(void)
52 extern struct ExecIFace *IExec;
54 IExec->GetCPUInfoTags(GCIT_VectorUnit, &result, TAG_DONE);
55 if (result == VECTORTYPE_ALTIVEC)
56 return AV_CPU_FLAG_ALTIVEC;
58 #elif defined(__APPLE__) || defined(__OpenBSD__)
60 int sels[2] = {CTL_MACHDEP, CPU_ALTIVEC};
62 int sels[2] = {CTL_HW, HW_VECTORUNIT};
65 size_t len = sizeof(has_vu);
68 err = sysctl(sels, 2, &has_vu, &len, NULL, 0);
71 return has_vu ? AV_CPU_FLAG_ALTIVEC : 0;
73 #elif defined(__linux__)
74 // The linux kernel could have the altivec support disabled
75 // even if the cpu has it.
77 int fd = open("/proc/self/auxv", O_RDONLY);
78 unsigned long buf[64] = { 0 };
84 while ((count = read(fd, buf, sizeof(buf))) > 0) {
85 for (i = 0; i < count / sizeof(*buf); i += 2) {
86 if (buf[i] == AT_NULL)
88 if (buf[i] == AT_HWCAP) {
89 if (buf[i + 1] & PPC_FEATURE_HAS_ALTIVEC)
90 ret = AV_CPU_FLAG_ALTIVEC;
91 #ifdef PPC_FEATURE_HAS_VSX
92 if (buf[i + 1] & PPC_FEATURE_HAS_VSX)
93 ret |= AV_CPU_FLAG_VSX;
95 #ifdef PPC_FEATURE_ARCH_2_07
96 if (buf[i + 1] & PPC_FEATURE_HAS_POWER8)
97 ret |= AV_CPU_FLAG_POWER8;
107 #elif CONFIG_RUNTIME_CPUDETECT && defined(__linux__) && !ARCH_PPC64
108 #define PVR_G4_7400 0x000C
109 #define PVR_G5_970 0x0039
110 #define PVR_G5_970FX 0x003C
111 #define PVR_G5_970MP 0x0044
112 #define PVR_G5_970GX 0x0045
113 #define PVR_POWER6 0x003E
114 #define PVR_POWER7 0x003F
115 #define PVR_POWER8 0x004B
116 #define PVR_CELL_PPU 0x0070
119 // Support of mfspr PVR emulation added in Linux 2.6.17.
120 __asm__ volatile("mfspr %0, 287" : "=r" (proc_ver));
122 if (proc_ver & 0x8000 ||
123 proc_ver == PVR_G4_7400 ||
124 proc_ver == PVR_G5_970 ||
125 proc_ver == PVR_G5_970FX ||
126 proc_ver == PVR_G5_970MP ||
127 proc_ver == PVR_G5_970GX ||
128 proc_ver == PVR_POWER6 ||
129 proc_ver == PVR_POWER7 ||
130 proc_ver == PVR_POWER8 ||
131 proc_ver == PVR_CELL_PPU)
132 ret = AV_CPU_FLAG_ALTIVEC;
133 if (proc_ver == PVR_POWER7 ||
134 proc_ver == PVR_POWER8)
135 ret |= AV_CPU_FLAG_VSX;
136 if (proc_ver == PVR_POWER8)
137 ret |= AV_CPU_FLAG_POWER8;
141 // Since we were compiled for AltiVec, just assume we have it
142 // until someone comes up with a proper way (not involving signal hacks).
143 return AV_CPU_FLAG_ALTIVEC;
144 #endif /* __AMIGAOS4__ */
145 #endif /* HAVE_ALTIVEC */