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134 lines
3.2 KiB
134 lines
3.2 KiB
/* |
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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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#include "libavutil/cpu.h" |
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#include "libavutil/cpu_internal.h" |
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#include "config.h" |
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#if defined __linux__ || defined __ANDROID__ |
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#include <stdint.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include <sys/auxv.h> |
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#include "asmdefs.h" |
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#include "libavutil/avstring.h" |
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#endif |
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#if defined __linux__ || defined __ANDROID__ |
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#define HWCAP_LOONGSON_CPUCFG (1 << 14) |
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static int cpucfg_available(void) |
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{ |
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return getauxval(AT_HWCAP) & HWCAP_LOONGSON_CPUCFG; |
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} |
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/* Most toolchains have no CPUCFG support yet */ |
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static uint32_t read_cpucfg(uint32_t reg) |
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{ |
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uint32_t __res; |
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__asm__ __volatile__( |
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"parse_r __res,%0\n\t" |
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"parse_r reg,%1\n\t" |
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".insn \n\t" |
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".word (0xc8080118 | (reg << 21) | (__res << 11))\n\t" |
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:"=r"(__res) |
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:"r"(reg) |
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: |
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); |
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return __res; |
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} |
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#define LOONGSON_CFG1 0x1 |
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#define LOONGSON_CFG1_MMI (1 << 4) |
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#define LOONGSON_CFG1_MSA1 (1 << 5) |
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static int cpu_flags_cpucfg(void) |
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{ |
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int flags = 0; |
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uint32_t cfg1 = read_cpucfg(LOONGSON_CFG1); |
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if (cfg1 & LOONGSON_CFG1_MMI) |
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flags |= AV_CPU_FLAG_MMI; |
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if (cfg1 & LOONGSON_CFG1_MSA1) |
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flags |= AV_CPU_FLAG_MSA; |
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return flags; |
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} |
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static int cpu_flags_cpuinfo(void) |
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{ |
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FILE *f = fopen("/proc/cpuinfo", "r"); |
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char buf[200]; |
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int flags = 0; |
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if (!f) |
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return -1; |
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while (fgets(buf, sizeof(buf), f)) { |
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/* Legacy kernel may not export MMI in ASEs implemented */ |
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if (av_strstart(buf, "cpu model", NULL)) { |
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if (strstr(buf, "Loongson-3 ")) |
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flags |= AV_CPU_FLAG_MMI; |
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} |
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if (av_strstart(buf, "ASEs implemented", NULL)) { |
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if (strstr(buf, " loongson-mmi")) |
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flags |= AV_CPU_FLAG_MMI; |
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if (strstr(buf, " msa")) |
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flags |= AV_CPU_FLAG_MSA; |
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break; |
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} |
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} |
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fclose(f); |
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return flags; |
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} |
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#endif |
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int ff_get_cpu_flags_mips(void) |
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{ |
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#if defined __linux__ || defined __ANDROID__ |
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if (cpucfg_available()) |
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return cpu_flags_cpucfg(); |
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else |
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return cpu_flags_cpuinfo(); |
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#else |
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/* Assume no SIMD ASE supported */ |
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return 0; |
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#endif |
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} |
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size_t ff_get_cpu_max_align_mips(void) |
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{ |
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int flags = av_get_cpu_flags(); |
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if (flags & AV_CPU_FLAG_MSA) |
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return 16; |
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/* |
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* MMI itself is 64-bit but quad word load & store |
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* needs 128-bit align. |
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*/ |
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if (flags & AV_CPU_FLAG_MMI) |
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return 16; |
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return 8; |
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}
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