--- /dev/null
+/*
+ * 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
+ */
+
+#include <sys/mman.h>
+#include <err.h>
+#include <unistd.h>
+
+#include <cassert>
+
+#include "base/loader/dtb_object.hh"
+#include "fdt.h"
+#include "libfdt.h"
+
+ObjectFile *
+DtbObject::tryFile(const std::string &fname, int fd, size_t len, uint8_t *data)
+{
+ // Check if this is a FDT file by looking for magic number
+ if (fdt_magic((void*)data) == FDT_MAGIC) {
+ return new DtbObject(fname, fd, len, data,
+ ObjectFile::UnknownArch, ObjectFile::UnknownOpSys);
+ } else {
+ return NULL;
+ }
+}
+
+DtbObject::DtbObject(const std::string &_filename, int _fd,
+ size_t _len, uint8_t *_data,
+ Arch _arch, OpSys _opSys)
+ : ObjectFile(_filename, _fd, _len, _data, _arch, _opSys)
+{
+ text.baseAddr = 0;
+ text.size = len;
+ text.fileImage = fileData;
+
+ data.baseAddr = 0;
+ data.size = 0;
+ data.fileImage = NULL;
+
+ bss.baseAddr = 0;
+ bss.size = 0;
+ bss.fileImage = NULL;
+
+ fileDataMmapped = true;
+}
+
+DtbObject::~DtbObject()
+{
+ if (descriptor >= 0) {
+ ::close(descriptor);
+ descriptor = -1;
+ }
+
+ // Make sure to clean up memory properly depending
+ // on how buffer was allocated.
+ if (fileData && !fileDataMmapped) {
+ delete [] fileData;
+ fileData = NULL;
+ } else if (fileData) {
+ munmap(fileData, len);
+ fileData = NULL;
+ }
+}
+
+bool
+DtbObject::addBootCmdLine(const char* _args, size_t len)
+{
+ const char* root_path = "/";
+ const char* node_name = "chosen";
+ const char* full_path_node_name = "/chosen";
+ const char* property_name = "bootargs";
+
+ // Make a new buffer that has extra space to add nodes/properties
+ int newLen = 2*this->len;
+ uint8_t* fdt_buf_w_space = new uint8_t[newLen];
+ // Copy and unpack flattened device tree into new buffer
+ int ret = fdt_open_into((void*)fileData, (void*)fdt_buf_w_space, (newLen));
+ if (ret < 0) {
+ warn("Error resizing buffer of flattened device tree, "
+ "errno: %d\n", ret);
+ delete [] fdt_buf_w_space;
+ return false;
+ }
+
+ // First try finding the /chosen node in the dtb
+ int offset = fdt_path_offset((void*)fdt_buf_w_space, full_path_node_name);
+ if (offset < 0) {
+ // try adding the node by walking dtb tree to proper insertion point
+ offset = fdt_path_offset((void*)fdt_buf_w_space, root_path);
+ offset = fdt_add_subnode((void*)fdt_buf_w_space, offset, node_name);
+ offset = fdt_path_offset((void*)fdt_buf_w_space, full_path_node_name);
+ if (offset < 0) {
+ warn("Error finding or adding \"chosen\" subnode to flattened "
+ "device tree, errno: %d\n", offset);
+ delete [] fdt_buf_w_space;
+ return false;
+ }
+ }
+
+ // Set the bootargs property in the /chosen node
+ ret = fdt_setprop((void*)fdt_buf_w_space, offset, property_name,
+ (const void*)_args, len+1);
+ if (ret < 0) {
+ warn("Error setting \"bootargs\" property to flattened device tree, "
+ "errno: %d\n", ret);
+ delete [] fdt_buf_w_space;
+ return false;
+ }
+
+ // Repack the dtb for kernel use
+ ret = fdt_pack((void*)fdt_buf_w_space);
+ if (ret < 0) {
+ warn("Error re-packing flattened device tree structure, "
+ "errno: %d\n", ret);
+ delete [] fdt_buf_w_space;
+ return false;
+ }
+
+ text.size = newLen;
+ text.fileImage = fdt_buf_w_space;
+
+ // clean up old buffer and set to new fdt blob
+ munmap(fileData, this->len);
+ fileData = fdt_buf_w_space;
+ fileDataMmapped = false;
+ this->len = newLen;
+
+ return true;
+}
+
+bool
+DtbObject::loadGlobalSymbols(SymbolTable *symtab, Addr addrMask)
+{
+ // nothing to do here
+ return false;
+}
+
+bool
+DtbObject::loadLocalSymbols(SymbolTable *symtab, Addr addrMask)
+{
+ // nothing to do here
+ return false;
+}
--- /dev/null
+/*
+ * 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__
projects / gem5.git / commitdiff