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133 lines
4.0 KiB
133 lines
4.0 KiB
/* |
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* Copyright © 2022 Rémi Denis-Courmont. |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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#define _GNU_SOURCE |
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#include "libavutil/cpu.h" |
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#include "libavutil/cpu_internal.h" |
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#include "libavutil/macros.h" |
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#include "libavutil/log.h" |
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#include "config.h" |
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#if HAVE_GETAUXVAL |
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#include <sys/auxv.h> |
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#define HWCAP_RV(letter) (1ul << ((letter) - 'A')) |
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#endif |
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#if HAVE_SYS_HWPROBE_H |
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#include <sys/hwprobe.h> |
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#elif HAVE_ASM_HWPROBE_H |
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#include <asm/hwprobe.h> |
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#include <sys/syscall.h> |
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#include <unistd.h> |
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static int __riscv_hwprobe(struct riscv_hwprobe *pairs, size_t pair_count, |
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size_t cpu_count, unsigned long *cpus, |
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unsigned int flags) |
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{ |
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return syscall(__NR_riscv_hwprobe, pairs, pair_count, cpu_count, cpus, |
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flags); |
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} |
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#endif |
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int ff_get_cpu_flags_riscv(void) |
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{ |
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int ret = 0; |
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#if HAVE_SYS_HWPROBE_H || HAVE_ASM_HWPROBE_H |
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struct riscv_hwprobe pairs[] = { |
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{ RISCV_HWPROBE_KEY_BASE_BEHAVIOR, 0 }, |
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{ RISCV_HWPROBE_KEY_IMA_EXT_0, 0 }, |
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{ RISCV_HWPROBE_KEY_CPUPERF_0, 0 }, |
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}; |
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if (__riscv_hwprobe(pairs, FF_ARRAY_ELEMS(pairs), 0, NULL, 0) == 0) { |
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if (pairs[0].value & RISCV_HWPROBE_BASE_BEHAVIOR_IMA) |
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ret |= AV_CPU_FLAG_RVI; |
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#ifdef RISCV_HWPROBE_IMA_V |
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if (pairs[1].value & RISCV_HWPROBE_IMA_V) |
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ret |= AV_CPU_FLAG_RVV_I32 | AV_CPU_FLAG_RVV_I64 |
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| AV_CPU_FLAG_RVV_F32 | AV_CPU_FLAG_RVV_F64; |
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#endif |
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#ifdef RISCV_HWPROBE_EXT_ZBB |
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if (pairs[1].value & RISCV_HWPROBE_EXT_ZBB) |
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ret |= AV_CPU_FLAG_RVB_BASIC; |
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#if defined (RISCV_HWPROBE_EXT_ZBA) && defined (RISCV_HWPROBE_EXT_ZBS) |
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if ((pairs[1].value & RISCV_HWPROBE_EXT_ZBA) && |
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(pairs[1].value & RISCV_HWPROBE_EXT_ZBB) && |
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(pairs[1].value & RISCV_HWPROBE_EXT_ZBS)) |
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ret |= AV_CPU_FLAG_RVB; |
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#endif |
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#endif |
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#ifdef RISCV_HWPROBE_EXT_ZVBB |
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if (pairs[1].value & RISCV_HWPROBE_EXT_ZVBB) |
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ret |= AV_CPU_FLAG_RV_ZVBB; |
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#endif |
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switch (pairs[2].value & RISCV_HWPROBE_MISALIGNED_MASK) { |
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case RISCV_HWPROBE_MISALIGNED_FAST: |
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ret |= AV_CPU_FLAG_RV_MISALIGNED; |
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break; |
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default: |
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} |
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} |
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#elif HAVE_GETAUXVAL |
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{ |
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const unsigned long hwcap = getauxval(AT_HWCAP); |
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if (hwcap & HWCAP_RV('I')) |
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ret |= AV_CPU_FLAG_RVI; |
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if (hwcap & HWCAP_RV('B')) |
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ret |= AV_CPU_FLAG_RVB_BASIC | AV_CPU_FLAG_RVB; |
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/* The V extension implies all Zve* functional subsets */ |
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if (hwcap & HWCAP_RV('V')) |
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ret |= AV_CPU_FLAG_RVV_I32 | AV_CPU_FLAG_RVV_I64 |
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| AV_CPU_FLAG_RVV_F32 | AV_CPU_FLAG_RVV_F64; |
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} |
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#endif |
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#ifdef __riscv_i |
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ret |= AV_CPU_FLAG_RVI; |
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#endif |
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#ifdef __riscv_zbb |
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ret |= AV_CPU_FLAG_RVB_BASIC; |
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#endif |
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#if defined (__riscv_b) || \ |
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(defined (__riscv_zba) && defined (__riscv_zbb) && defined (__riscv_zbs)) |
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ret |= AV_CPU_FLAG_RVB; |
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#endif |
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/* If RV-V is enabled statically at compile-time, check the details. */ |
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#ifdef __riscv_vector |
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ret |= AV_CPU_FLAG_RVV_I32; |
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#if __riscv_v_elen >= 64 |
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ret |= AV_CPU_FLAG_RVV_I64; |
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#endif |
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#if __riscv_v_elen_fp >= 32 |
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ret |= AV_CPU_FLAG_RVV_F32; |
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#if __riscv_v_elen_fp >= 64 |
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ret |= AV_CPU_FLAG_RVV_F64; |
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#endif |
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#endif |
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#endif |
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#ifdef __riscv_zvbb |
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ret |= AV_CPU_FLAG_RV_ZVBB; |
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#endif |
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return ret; |
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}
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