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authorAlexander Graf <agraf@suse.de>2012-05-17 15:33:54 +0200
committerAlexander Graf <agraf@suse.de>2012-06-24 01:04:46 +0200
commitce36252cc1711a5e222ed68e72235088aec2529d (patch)
treed8bed75b452a6a9fae70c465196f01285a84d113 /device_tree.c
parent7d5fd1089c36391ffc53a694101f441ab8cbbc05 (diff)
downloadqemu-arm-ce36252cc1711a5e222ed68e72235088aec2529d.tar.gz
dt: add helper for empty dt creation
We want to get rid of the concept of loading an external device tree and instead generate our own. However, to do this we need to also create a device tree template programatically. This patch adds a helper to create an empty device tree in memory. Signed-off-by: Alexander Graf <agraf@suse.de> Reviewed-by: Peter Crosthwaite <peter.crosthwaite@petalogix.com>
Diffstat (limited to 'device_tree.c')
-rw-r--r--device_tree.c37
1 files changed, 37 insertions, 0 deletions
diff --git a/device_tree.c b/device_tree.c
index 2f127b71b0..d0378961f0 100644
--- a/device_tree.c
+++ b/device_tree.c
@@ -25,6 +25,43 @@
#include <libfdt.h>
+#define FDT_MAX_SIZE 0x10000
+
+void *create_device_tree(int *sizep)
+{
+ void *fdt;
+ int ret;
+
+ *sizep = FDT_MAX_SIZE;
+ fdt = g_malloc0(FDT_MAX_SIZE);
+ ret = fdt_create(fdt, FDT_MAX_SIZE);
+ if (ret < 0) {
+ goto fail;
+ }
+ ret = fdt_begin_node(fdt, "");
+ if (ret < 0) {
+ goto fail;
+ }
+ ret = fdt_end_node(fdt);
+ if (ret < 0) {
+ goto fail;
+ }
+ ret = fdt_finish(fdt);
+ if (ret < 0) {
+ goto fail;
+ }
+ ret = fdt_open_into(fdt, fdt, *sizep);
+ if (ret) {
+ fprintf(stderr, "Unable to copy device tree in memory\n");
+ exit(1);
+ }
+
+ return fdt;
+fail:
+ fprintf(stderr, "%s Couldn't create dt: %s\n", __func__, fdt_strerror(ret));
+ exit(1);
+}
+
void *load_device_tree(const char *filename_path, int *sizep)
{
int dt_size;