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f652e6af11
To implement the -kernel, -initrd, and -append options, 4xx board emulation must load the guest kernel as if firmware had loaded it. Where u-boot would be the firmware, we must load the flat device tree into memory and set key fields such as /chosen/bootargs. This patch introduces a dependency on libfdt for flat device tree support. Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6064 c046a42c-6fe2-441c-8c8c-71466251a162
115 lines
2.8 KiB
C
115 lines
2.8 KiB
C
/*
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* Functions to help device tree manipulation using libfdt.
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* It also provides functions to read entries from device tree proc
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* interface.
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*
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* Copyright 2008 IBM Corporation.
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* Authors: Jerone Young <jyoung5@us.ibm.com>
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* Hollis Blanchard <hollisb@us.ibm.com>
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*
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* This work is licensed under the GNU GPL license version 2 or later.
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*
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*/
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include "config.h"
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#include "qemu-common.h"
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#include "sysemu.h"
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#include "device_tree.h"
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#include <libfdt.h>
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void *load_device_tree(const char *filename_path, void *load_addr)
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{
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int dt_file_size;
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int dt_file_load_size;
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int new_dt_size;
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int ret;
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void *dt_file = NULL;
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void *fdt;
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dt_file_size = get_image_size(filename_path);
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if (dt_file_size < 0) {
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printf("Unable to get size of device tree file '%s'\n",
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filename_path);
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goto fail;
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}
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/* First allocate space in qemu for device tree */
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dt_file = qemu_mallocz(dt_file_size);
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if (dt_file == NULL) {
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printf("Unable to allocate memory in qemu for device tree\n");
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goto fail;
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}
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dt_file_load_size = load_image(filename_path, dt_file);
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/* Second we place new copy of 2x size in guest memory
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* This give us enough room for manipulation.
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*/
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new_dt_size = dt_file_size * 2;
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fdt = load_addr;
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ret = fdt_open_into(dt_file, fdt, new_dt_size);
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if (ret) {
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printf("Unable to copy device tree in memory\n");
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goto fail;
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}
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/* Check sanity of device tree */
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if (fdt_check_header(fdt)) {
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printf ("Device tree file loaded into memory is invalid: %s\n",
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filename_path);
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goto fail;
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}
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/* free qemu memory with old device tree */
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qemu_free(dt_file);
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return fdt;
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fail:
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qemu_free(dt_file);
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return NULL;
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}
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int qemu_devtree_setprop(void *fdt, const char *node_path,
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const char *property, uint32_t *val_array, int size)
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{
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int offset;
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offset = fdt_path_offset(fdt, node_path);
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if (offset < 0)
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return offset;
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return fdt_setprop(fdt, offset, property, val_array, size);
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}
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int qemu_devtree_setprop_cell(void *fdt, const char *node_path,
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const char *property, uint32_t val)
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{
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int offset;
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offset = fdt_path_offset(fdt, node_path);
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if (offset < 0)
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return offset;
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return fdt_setprop_cell(fdt, offset, property, val);
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}
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int qemu_devtree_setprop_string(void *fdt, const char *node_path,
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const char *property, const char *string)
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{
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int offset;
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offset = fdt_path_offset(fdt, node_path);
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if (offset < 0)
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return offset;
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return fdt_setprop_string(fdt, offset, property, string);
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}
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