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authoraurel32 <aurel32@c046a42c-6fe2-441c-8c8c-71466251a162>2008-12-16 10:43:48 +0000
committeraurel32 <aurel32@c046a42c-6fe2-441c-8c8c-71466251a162>2008-12-16 10:43:48 +0000
commitf652e6af11c670da4bbd738a1bca8b4b31ed97b4 (patch)
tree8bb833e6e9198e80f8ba8507e4ec442d0e2823ec /device_tree.c
parentb7da58fd27bfbe7c14bc8a0332135663f17caecc (diff)
downloadqemu-arm-f652e6af11c670da4bbd738a1bca8b4b31ed97b4.tar.gz
Implement device tree support needed for Bamboo emulation
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
Diffstat (limited to 'device_tree.c')
-rw-r--r--device_tree.c114
1 files changed, 114 insertions, 0 deletions
diff --git a/device_tree.c b/device_tree.c
new file mode 100644
index 0000000000..22386829de
--- /dev/null
+++ b/device_tree.c
@@ -0,0 +1,114 @@
+/*
+ * Functions to help device tree manipulation using libfdt.
+ * It also provides functions to read entries from device tree proc
+ * interface.
+ *
+ * Copyright 2008 IBM Corporation.
+ * Authors: Jerone Young <jyoung5@us.ibm.com>
+ * Hollis Blanchard <hollisb@us.ibm.com>
+ *
+ * This work is licensed under the GNU GPL license version 2 or later.
+ *
+ */
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+#include "config.h"
+#include "qemu-common.h"
+#include "sysemu.h"
+#include "device_tree.h"
+
+#include <libfdt.h>
+
+void *load_device_tree(const char *filename_path, void *load_addr)
+{
+ int dt_file_size;
+ int dt_file_load_size;
+ int new_dt_size;
+ int ret;
+ void *dt_file = NULL;
+ void *fdt;
+
+ dt_file_size = get_image_size(filename_path);
+ if (dt_file_size < 0) {
+ printf("Unable to get size of device tree file '%s'\n",
+ filename_path);
+ goto fail;
+ }
+
+ /* First allocate space in qemu for device tree */
+ dt_file = qemu_mallocz(dt_file_size);
+ if (dt_file == NULL) {
+ printf("Unable to allocate memory in qemu for device tree\n");
+ goto fail;
+ }
+
+ dt_file_load_size = load_image(filename_path, dt_file);
+
+ /* Second we place new copy of 2x size in guest memory
+ * This give us enough room for manipulation.
+ */
+ new_dt_size = dt_file_size * 2;
+
+ fdt = load_addr;
+ ret = fdt_open_into(dt_file, fdt, new_dt_size);
+ if (ret) {
+ printf("Unable to copy device tree in memory\n");
+ goto fail;
+ }
+
+ /* Check sanity of device tree */
+ if (fdt_check_header(fdt)) {
+ printf ("Device tree file loaded into memory is invalid: %s\n",
+ filename_path);
+ goto fail;
+ }
+ /* free qemu memory with old device tree */
+ qemu_free(dt_file);
+ return fdt;
+
+fail:
+ qemu_free(dt_file);
+ return NULL;
+}
+
+int qemu_devtree_setprop(void *fdt, const char *node_path,
+ const char *property, uint32_t *val_array, int size)
+{
+ int offset;
+
+ offset = fdt_path_offset(fdt, node_path);
+ if (offset < 0)
+ return offset;
+
+ return fdt_setprop(fdt, offset, property, val_array, size);
+}
+
+int qemu_devtree_setprop_cell(void *fdt, const char *node_path,
+ const char *property, uint32_t val)
+{
+ int offset;
+
+ offset = fdt_path_offset(fdt, node_path);
+ if (offset < 0)
+ return offset;
+
+ return fdt_setprop_cell(fdt, offset, property, val);
+}
+
+int qemu_devtree_setprop_string(void *fdt, const char *node_path,
+ const char *property, const char *string)
+{
+ int offset;
+
+ offset = fdt_path_offset(fdt, node_path);
+ if (offset < 0)
+ return offset;
+
+ return fdt_setprop_string(fdt, offset, property, string);
+}