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
36 #include <sys/auxv.h>
37
38 #define HWCAP_RVV (1 << ('v' - 'a'))
39
40 #endif
41
42 int dav1d_has_compliant_rvv(void);
43
dav1d_get_cpu_flags_riscv(void)44 COLD unsigned dav1d_get_cpu_flags_riscv(void) {
45 unsigned flags = dav1d_get_default_cpu_flags();
46 #if HAVE_GETAUXVAL
47 unsigned long hw_cap = getauxval(AT_HWCAP);
48 flags |= (hw_cap & HWCAP_RVV) && dav1d_has_compliant_rvv() ? DAV1D_RISCV_CPU_FLAG_V : 0;
49 #endif
50
51 return flags;
52 }
53