loader: add a flattened device tree blob (dtb) object

this adds a dtb_object so the loader can load in the dtb
file for linux/android ARM kernels.

1 files changed, 80 insertions, 0 deletions

diff --git a/src/base/loader/dtb_object.hh b/src/base/loader/dtb_object.hh
new file mode 100644
index 000000000..ec5294553
--- /dev/null
+++ b/src/base/loader/dtb_object.hh
@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2013 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Authors: Anthony Gutierrez
+ */
+
+#ifndef __DTB_OBJECT_HH__
+#define __DTB_OBJECT_HH__
+
+#include "base/loader/object_file.hh"
+
+/** @file
+ * This implements an object file format to support loading
+ * and modifying flattened device tree blobs for use with
+ * current and future ARM Linux kernels.
+ */
+class DtbObject : public ObjectFile
+{
+    protected:
+        DtbObject(const std::string &_filename, int _fd,
+                  size_t _len, uint8_t *_data,
+                  Arch _arch, OpSys _opSys);
+
+        /** Bool marking if this dtb file has replaced the original
+         *  read in DTB file with a new modified buffer
+         */
+        bool fileDataMmapped;
+
+    public:
+        virtual ~DtbObject();
+
+        /** Adds the passed in Command Line options for the kernel
+          * to the proper location in the device tree.
+          * @param _args command line to append
+          * @param len length of the command line string
+          * @return returns true on success, false otherwise
+          */
+        bool addBootCmdLine(const char* _args, size_t len);
+        bool loadGlobalSymbols(SymbolTable *symtab,
+            Addr addrMask = std::numeric_limits<Addr>::max());
+        bool loadLocalSymbols(SymbolTable *symtab,
+            Addr addrMask = std::numeric_limits<Addr>::max());
+
+        /** Static function that tries to load file as a
+          * flattened device tree blob.
+          * @param fname path to file
+          * @param fd file descriptor of object file
+          * @param len length of file
+          * @param data mmap'ed data buffer containing file contents
+          * @return ObjectFile representing closest match of file type
+          */
+        static ObjectFile *tryFile(const std::string &fname, int fd,
+                                   size_t len, uint8_t *data);
+};
+
+#endif //__DTB_OBJECT_HH__