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