1 files changed, 57 insertions, 0 deletions
diff --git a/media/libvpx/libvpx/vpx_ports/mips_cpudetect.c b/media/libvpx/libvpx/vpx_ports/mips_cpudetect.c
new file mode 100644
index 0000000000..e0eca2d48d
--- /dev/null
+++ b/media/libvpx/libvpx/vpx_ports/mips_cpudetect.c
@@ -0,0 +1,57 @@
+/*
+ *  Copyright (c) 2020 The WebM project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+#include <stdio.h>
+#include <string.h>
+#include "./vpx_config.h"
+#include "vpx_ports/mips.h"
+
+#if CONFIG_RUNTIME_CPU_DETECT
+#if defined(__mips__) && defined(__linux__)
+int mips_cpu_caps(void) {
+  char cpuinfo_line[512];
+  int flag = 0x0;
+  FILE *f = fopen("/proc/cpuinfo", "r");
+  if (!f) {
+    // Assume nothing if /proc/cpuinfo is unavailable.
+    // This will occur for Chrome sandbox for Pepper or Render process.
+    return 0;
+  }
+  while (fgets(cpuinfo_line, sizeof(cpuinfo_line) - 1, f)) {
+    if (memcmp(cpuinfo_line, "cpu model", 9) == 0) {
+      // Workaround early kernel without mmi in ASEs line.
+      if (strstr(cpuinfo_line, "Loongson-3")) {
+        flag |= HAS_MMI;
+      } else if (strstr(cpuinfo_line, "Loongson-2K")) {
+        flag |= HAS_MMI | HAS_MSA;
+      }
+    }
+    if (memcmp(cpuinfo_line, "ASEs implemented", 16) == 0) {
+      if (strstr(cpuinfo_line, "loongson-mmi") &&
+          strstr(cpuinfo_line, "loongson-ext")) {
+        flag |= HAS_MMI;
+      }
+      if (strstr(cpuinfo_line, "msa")) {
+        flag |= HAS_MSA;
+      }
+      // ASEs is the last line, so we can break here.
+      break;
+    }
+  }
+  fclose(f);
+  return flag;
+}
+#else /* end __mips__ && __linux__ */
+#error \
+    "--enable-runtime-cpu-detect selected, but no CPU detection method " \
+"available for your platform. Reconfigure with --disable-runtime-cpu-detect."
+#endif
+#else /* end CONFIG_RUNTIME_CPU_DETECT */
+int mips_cpu_caps(void) { return 0; }
+#endif