| /* |
| * 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 "libavutil/cpu.h" |
| #include "libavutil/cpu_internal.h" |
| #include "config.h" |
| |
| #define CORE_FLAG(f) \ |
| (AV_CPU_FLAG_ ## f * (HAVE_ ## f ## _EXTERNAL || HAVE_ ## f ## _INLINE)) |
| |
| #define CORE_CPU_FLAGS \ |
| (CORE_FLAG(ARMV5TE) | \ |
| CORE_FLAG(ARMV6) | \ |
| CORE_FLAG(ARMV6T2) | \ |
| CORE_FLAG(VFP) | \ |
| CORE_FLAG(VFPV3) | \ |
| CORE_FLAG(NEON)) |
| |
| #if defined __linux__ || defined __ANDROID__ |
| |
| #include <stdint.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include "libavutil/avstring.h" |
| |
| #define AT_HWCAP 16 |
| |
| /* Relevant HWCAP values from kernel headers */ |
| #define HWCAP_VFP (1 << 6) |
| #define HWCAP_EDSP (1 << 7) |
| #define HWCAP_THUMBEE (1 << 11) |
| #define HWCAP_NEON (1 << 12) |
| #define HWCAP_VFPv3 (1 << 13) |
| #define HWCAP_TLS (1 << 15) |
| |
| static int get_hwcap(uint32_t *hwcap) |
| { |
| struct { uint32_t a_type; uint32_t a_val; } auxv; |
| FILE *f = fopen("/proc/self/auxv", "r"); |
| int err = -1; |
| |
| if (!f) |
| return -1; |
| |
| while (fread(&auxv, sizeof(auxv), 1, f) > 0) { |
| if (auxv.a_type == AT_HWCAP) { |
| *hwcap = auxv.a_val; |
| err = 0; |
| break; |
| } |
| } |
| |
| fclose(f); |
| return err; |
| } |
| |
| static int get_cpuinfo(uint32_t *hwcap) |
| { |
| FILE *f = fopen("/proc/cpuinfo", "r"); |
| char buf[200]; |
| |
| if (!f) |
| return -1; |
| |
| *hwcap = 0; |
| while (fgets(buf, sizeof(buf), f)) { |
| if (av_strstart(buf, "Features", NULL)) { |
| if (strstr(buf, " edsp ")) |
| *hwcap |= HWCAP_EDSP; |
| if (strstr(buf, " tls ")) |
| *hwcap |= HWCAP_TLS; |
| if (strstr(buf, " thumbee ")) |
| *hwcap |= HWCAP_THUMBEE; |
| if (strstr(buf, " vfp ")) |
| *hwcap |= HWCAP_VFP; |
| if (strstr(buf, " vfpv3 ")) |
| *hwcap |= HWCAP_VFPv3; |
| if (strstr(buf, " neon ") || strstr(buf, " asimd ")) |
| *hwcap |= HWCAP_NEON; |
| if (strstr(buf, " fp ")) // Listed on 64 bit ARMv8 kernels |
| *hwcap |= HWCAP_VFP | HWCAP_VFPv3; |
| break; |
| } |
| } |
| fclose(f); |
| return 0; |
| } |
| |
| int ff_get_cpu_flags_arm(void) |
| { |
| int flags = CORE_CPU_FLAGS; |
| uint32_t hwcap; |
| |
| if (get_hwcap(&hwcap) < 0) |
| if (get_cpuinfo(&hwcap) < 0) |
| return flags; |
| |
| #define check_cap(cap, flag) do { \ |
| if (hwcap & HWCAP_ ## cap) \ |
| flags |= AV_CPU_FLAG_ ## flag; \ |
| } while (0) |
| |
| /* No flags explicitly indicate v6 or v6T2 so check others which |
| imply support. */ |
| check_cap(EDSP, ARMV5TE); |
| check_cap(TLS, ARMV6); |
| check_cap(THUMBEE, ARMV6T2); |
| check_cap(VFP, VFP); |
| check_cap(VFPv3, VFPV3); |
| check_cap(NEON, NEON); |
| |
| /* The v6 checks above are not reliable so let higher flags |
| trickle down. */ |
| if (flags & (AV_CPU_FLAG_VFPV3 | AV_CPU_FLAG_NEON)) |
| flags |= AV_CPU_FLAG_ARMV6T2; |
| else if (flags & (AV_CPU_FLAG_ARMV6T2 | AV_CPU_FLAG_ARMV6)) |
| /* Some functions use the 'setend' instruction which is deprecated on ARMv8 |
| * and serializing on some ARMv7 cores. This ensures such functions |
| * are only enabled on ARMv6. */ |
| flags |= AV_CPU_FLAG_SETEND; |
| |
| if (flags & AV_CPU_FLAG_ARMV6T2) |
| flags |= AV_CPU_FLAG_ARMV6; |
| |
| return flags; |
| } |
| |
| #else |
| |
| int ff_get_cpu_flags_arm(void) |
| { |
| return AV_CPU_FLAG_ARMV5TE * HAVE_ARMV5TE | |
| AV_CPU_FLAG_ARMV6 * HAVE_ARMV6 | |
| AV_CPU_FLAG_ARMV6T2 * HAVE_ARMV6T2 | |
| AV_CPU_FLAG_VFP * HAVE_VFP | |
| AV_CPU_FLAG_VFPV3 * HAVE_VFPV3 | |
| AV_CPU_FLAG_NEON * HAVE_NEON | |
| AV_CPU_FLAG_SETEND * !(HAVE_NEON | HAVE_VFPV3); |
| } |
| |
| #endif |