| /* |
| * 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 |
| */ |
| |
| |
| /** |
| * @file libavcodec/ppc/check_altivec.c |
| * Checks for AltiVec presence. |
| */ |
| |
| #ifdef __APPLE__ |
| #undef _POSIX_C_SOURCE |
| #include <sys/sysctl.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__ */ |
| |
| /** |
| * This function MAY rely on signal() or fork() in order to make sure AltiVec |
| * is present. |
| */ |
| |
| int has_altivec(void) |
| { |
| #ifdef __AMIGAOS4__ |
| ULONG result = 0; |
| extern struct ExecIFace *IExec; |
| |
| IExec->GetCPUInfoTags(GCIT_VectorUnit, &result, TAG_DONE); |
| if (result == VECTORTYPE_ALTIVEC) return 1; |
| 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 != 0; |
| return 0; |
| #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 1; |
| 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 1; |
| #endif /* __AMIGAOS4__ */ |
| } |
| |