1/*
2 * Copyright (c) 2020 Loongson Technology Corporation Limited
3 * Contributed by Shiyou Yin <yinshiyou-hf@loongson.cn>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#include <stdint.h>
23#include "cpu.h"
24
25#define LOONGARCH_CFG2 0x2
26#define LOONGARCH_CFG2_LSX    (1 << 6)
27#define LOONGARCH_CFG2_LASX   (1 << 7)
28
29static int cpu_flags_cpucfg(void)
30{
31    int flags = 0;
32    uint32_t cfg2 = 0;
33
34    __asm__ volatile(
35        "cpucfg %0, %1 \n\t"
36        : "+&r"(cfg2)
37        : "r"(LOONGARCH_CFG2)
38    );
39
40    if (cfg2 & LOONGARCH_CFG2_LSX)
41        flags |= AV_CPU_FLAG_LSX;
42
43    if (cfg2 & LOONGARCH_CFG2_LASX)
44        flags |= AV_CPU_FLAG_LASX;
45
46    return flags;
47}
48
49int ff_get_cpu_flags_loongarch(void)
50{
51#if defined __linux__
52    return cpu_flags_cpucfg();
53#else
54    /* Assume no SIMD ASE supported */
55    return 0;
56#endif
57}
58
59size_t ff_get_cpu_max_align_loongarch(void)
60{
61    int flags = av_get_cpu_flags();
62
63    if (flags & AV_CPU_FLAG_LASX)
64        return 32;
65    if (flags & AV_CPU_FLAG_LSX)
66        return 16;
67
68    return 8;
69}
70