cpu.c (1979B)
1 /* 2 * Copyright © 2022, VideoLAN and dav1d authors 3 * Copyright © 2022, Nathan Egge 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright notice, this 10 * list of conditions and the following disclaimer. 11 * 12 * 2. Redistributions in binary form must reproduce the above copyright notice, 13 * this list of conditions and the following disclaimer in the documentation 14 * and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 19 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR 20 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 23 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 25 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include "config.h" 29 30 #include "common/attributes.h" 31 32 #include "src/cpu.h" 33 #include "src/riscv/cpu.h" 34 35 #if HAVE_GETAUXVAL || HAVE_ELF_AUX_INFO 36 #include <sys/auxv.h> 37 #define HWCAP_RVV (1 << ('v' - 'a')) 38 #endif 39 40 int dav1d_has_compliant_rvv(void); 41 42 COLD unsigned dav1d_get_cpu_flags_riscv(void) { 43 unsigned flags = dav1d_get_default_cpu_flags(); 44 #if HAVE_GETAUXVAL || HAVE_ELF_AUX_INFO 45 unsigned long hw_cap = dav1d_getauxval(AT_HWCAP); 46 flags |= (hw_cap & HWCAP_RVV) && dav1d_has_compliant_rvv() ? DAV1D_RISCV_CPU_FLAG_V : 0; 47 #endif 48 49 return flags; 50 }