58 lines
1.8 KiB
C
58 lines
1.8 KiB
C
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/*
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* Copyright (c) 2020 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include <stdio.h>
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#include <string.h>
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#include "./vpx_config.h"
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#include "vpx_ports/mips.h"
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#if CONFIG_RUNTIME_CPU_DETECT
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#if defined(__mips__) && defined(__linux__)
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int mips_cpu_caps(void) {
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char cpuinfo_line[512];
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int flag = 0x0;
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FILE *f = fopen("/proc/cpuinfo", "r");
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if (!f) {
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// Assume nothing if /proc/cpuinfo is unavailable.
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// This will occur for Chrome sandbox for Pepper or Render process.
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return 0;
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}
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while (fgets(cpuinfo_line, sizeof(cpuinfo_line) - 1, f)) {
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if (memcmp(cpuinfo_line, "cpu model", 9) == 0) {
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// Workaround early kernel without mmi in ASEs line.
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if (strstr(cpuinfo_line, "Loongson-3")) {
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flag |= HAS_MMI;
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} else if (strstr(cpuinfo_line, "Loongson-2K")) {
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flag |= HAS_MMI | HAS_MSA;
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}
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}
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if (memcmp(cpuinfo_line, "ASEs implemented", 16) == 0) {
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if (strstr(cpuinfo_line, "loongson-mmi") &&
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strstr(cpuinfo_line, "loongson-ext")) {
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flag |= HAS_MMI;
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}
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if (strstr(cpuinfo_line, "msa")) {
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flag |= HAS_MSA;
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}
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// ASEs is the last line, so we can break here.
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break;
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}
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}
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fclose(f);
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return flag;
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}
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#else /* end __mips__ && __linux__ */
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#error \
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"--enable-runtime-cpu-detect selected, but no CPU detection method " \
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"available for your platform. Reconfigure with --disable-runtime-cpu-detect."
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#endif
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#else /* end CONFIG_RUNTIME_CPU_DETECT */
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int mips_cpu_caps(void) { return 0; }
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#endif
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