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144 lines
4.1 KiB
144 lines
4.1 KiB
/* |
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* This file is part of Libav. |
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* |
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* Libav is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* Libav is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with Libav; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#ifdef __APPLE__ |
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#include <sys/sysctl.h> |
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#elif defined(__linux__) |
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#include <asm/cputable.h> |
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#include <linux/auxvec.h> |
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#include <fcntl.h> |
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#include <unistd.h> |
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#elif defined(__OpenBSD__) |
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#include <sys/param.h> |
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#include <sys/sysctl.h> |
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#include <machine/cpu.h> |
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#elif defined(__AMIGAOS4__) |
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#include <exec/exec.h> |
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#include <interfaces/exec.h> |
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#include <proto/exec.h> |
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#endif /* __APPLE__ */ |
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#include "libavutil/cpu.h" |
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#include "libavutil/cpu_internal.h" |
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#include "config.h" |
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/** |
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* This function MAY rely on signal() or fork() in order to make sure AltiVec |
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* is present. |
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*/ |
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int ff_get_cpu_flags_ppc(void) |
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{ |
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#if HAVE_ALTIVEC |
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#ifdef __AMIGAOS4__ |
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ULONG result = 0; |
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extern struct ExecIFace *IExec; |
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IExec->GetCPUInfoTags(GCIT_VectorUnit, &result, TAG_DONE); |
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if (result == VECTORTYPE_ALTIVEC) |
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return AV_CPU_FLAG_ALTIVEC; |
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return 0; |
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#elif defined(__APPLE__) || defined(__OpenBSD__) |
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#ifdef __OpenBSD__ |
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int sels[2] = {CTL_MACHDEP, CPU_ALTIVEC}; |
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#else |
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int sels[2] = {CTL_HW, HW_VECTORUNIT}; |
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#endif |
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int has_vu = 0; |
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size_t len = sizeof(has_vu); |
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int err; |
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err = sysctl(sels, 2, &has_vu, &len, NULL, 0); |
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if (err == 0) |
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return has_vu ? AV_CPU_FLAG_ALTIVEC : 0; |
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return 0; |
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#elif defined(__linux__) |
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// The linux kernel could have the altivec support disabled |
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// even if the cpu has it. |
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int i, ret = 0; |
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int fd = open("/proc/self/auxv", O_RDONLY); |
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unsigned long buf[64] = { 0 }; |
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ssize_t count; |
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if (fd < 0) |
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return 0; |
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while ((count = read(fd, buf, sizeof(buf))) > 0) { |
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for (i = 0; i < count / sizeof(*buf); i += 2) { |
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if (buf[i] == AT_NULL) |
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goto out; |
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if (buf[i] == AT_HWCAP) { |
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if (buf[i + 1] & PPC_FEATURE_HAS_ALTIVEC) |
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ret = AV_CPU_FLAG_ALTIVEC; |
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#ifdef PPC_FEATURE_HAS_VSX |
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if (buf[i + 1] & PPC_FEATURE_HAS_VSX) |
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ret |= AV_CPU_FLAG_VSX; |
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#endif |
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#ifdef PPC_FEATURE_ARCH_2_07 |
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if (buf[i + 1] & PPC_FEATURE_HAS_POWER8) |
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ret |= AV_CPU_FLAG_POWER8; |
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#endif |
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goto out; |
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} |
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} |
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} |
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out: |
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close(fd); |
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return ret; |
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#elif CONFIG_RUNTIME_CPUDETECT |
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#define PVR_G4_7400 0x000C |
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#define PVR_G5_970 0x0039 |
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#define PVR_G5_970FX 0x003C |
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#define PVR_G5_970MP 0x0044 |
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#define PVR_G5_970GX 0x0045 |
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#define PVR_POWER6 0x003E |
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#define PVR_POWER7 0x003F |
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#define PVR_POWER8 0x004B |
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#define PVR_CELL_PPU 0x0070 |
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int ret = 0; |
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int proc_ver; |
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// Support of mfspr PVR emulation added in Linux 2.6.17. |
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__asm__ volatile("mfspr %0, 287" : "=r" (proc_ver)); |
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proc_ver >>= 16; |
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if (proc_ver & 0x8000 || |
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proc_ver == PVR_G4_7400 || |
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proc_ver == PVR_G5_970 || |
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proc_ver == PVR_G5_970FX || |
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proc_ver == PVR_G5_970MP || |
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proc_ver == PVR_G5_970GX || |
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proc_ver == PVR_POWER6 || |
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proc_ver == PVR_POWER7 || |
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proc_ver == PVR_POWER8 || |
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proc_ver == PVR_CELL_PPU) |
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ret = AV_CPU_FLAG_ALTIVEC; |
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if (proc_ver == PVR_POWER7 || |
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proc_ver == PVR_POWER8) |
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ret |= AV_CPU_FLAG_VSX; |
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if (proc_ver == PVR_POWER8) |
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ret |= AV_CPU_FLAG_POWER8; |
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return ret; |
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#else |
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// Since we were compiled for AltiVec, just assume we have it |
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// until someone comes up with a proper way (not involving signal hacks). |
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return AV_CPU_FLAG_ALTIVEC; |
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#endif /* __AMIGAOS4__ */ |
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#endif /* HAVE_ALTIVEC */ |
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return 0; |
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}
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