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diff --git a/brillo/namespaces/platform.h b/brillo/namespaces/platform.h
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+++ b/brillo/namespaces/platform.h
@@ -0,0 +1,71 @@
+// Copyright 2020 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef LIBBRILLO_BRILLO_NAMESPACES_PLATFORM_H_
+#define LIBBRILLO_BRILLO_NAMESPACES_PLATFORM_H_
+
+#include <sys/types.h>
+
+#include <memory>
+#include <string>
+
+#include <base/files/file_path.h>
+#include <base/macros.h>
+#include <brillo/brillo_export.h>
+
+namespace brillo {
+// Platform specific routines abstraction layer.
+// Also helps us to be able to mock them in tests.
+class BRILLO_EXPORT Platform {
+ public:
+  Platform();
+
+  virtual ~Platform();
+  // Calls the platform fork() function and returns the pid returned
+  // by fork().
+  virtual pid_t Fork();
+
+  // Calls the platform unmount.
+  //
+  // Parameters
+  //   path - The path to unmount
+  //   lazy - Whether to call a lazy unmount
+  //   was_busy (OUT) - Set to true on return if the mount point was busy
+  virtual bool Unmount(const base::FilePath& path, bool lazy, bool* was_busy);
+
+  // Calls the platform mount.
+  //
+  // Parameters
+  //   source - The path to mount from
+  //   target - The path to mount to
+  //   fs_type - File system type of the mount
+  //   mount_flags - Flags spesifying the type of the mount operation
+  //   data - Mount options
+  virtual int Mount(const std::string& source,
+                    const std::string& target,
+                    const std::string& fs_type,
+                    uint64_t mount_flags,
+                    const void* = nullptr);
+
+  // Checks the file system type of the |path| and returns true if the
+  // filesystem type is nsfs.
+  //
+  // Parameters
+  //   path - The path to check the file system type
+  virtual bool FileSystemIsNsfs(const base::FilePath& path);
+
+  // Calls the platform waitpid() function and returns the value returned by
+  // waitpid().
+  //
+  // Parameters
+  //   pid - The child pid to be waited on
+  //   status (OUT)- Termination status of a child process.
+  virtual pid_t Waitpid(pid_t pid, int* status);
+
+  DISALLOW_COPY_AND_ASSIGN(Platform);
+};
+
+}  // namespace brillo
+
+#endif  // LIBBRILLO_BRILLO_NAMESPACES_PLATFORM_H_