riscv_cpudetect.c (1084B)
1 /* 2 * Copyright (c) 2025, Alliance for Open Media. All rights reserved. 3 * 4 * This source code is subject to the terms of the BSD 2 Clause License and 5 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License 6 * was not distributed with this source code in the LICENSE file, you can 7 * obtain it at www.aomedia.org/license/software. If the Alliance for Open 8 * Media Patent License 1.0 was not distributed with this source code in the 9 * PATENTS file, you can obtain it at www.aomedia.org/license/patent. 10 */ 11 12 #include <fcntl.h> 13 #include <unistd.h> 14 #include <stdint.h> 15 16 #include "config/aom_config.h" 17 18 #include "aom_ports/riscv.h" 19 20 #if CONFIG_RUNTIME_CPU_DETECT 21 22 #include <sys/auxv.h> 23 24 #define HWCAP_RVV (1 << ('v' - 'a')) 25 26 int riscv_simd_caps(void) { 27 int flags = 0; 28 #if HAVE_RVV 29 unsigned long hwcap = getauxval(AT_HWCAP); 30 if (hwcap & HWCAP_RVV) flags |= HAS_RVV; 31 #endif 32 return flags; 33 } 34 #else 35 // If there is no RTCD the function pointers are not used and can not be 36 // changed. 37 int riscv_simd_caps(void) { return 0; } 38 #endif // CONFIG_RUNTIME_CPU_DETECT