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From b3417ec69ff7d52379a8f2cb291dbecccdab684f Mon Sep 17 00:00:00 2001
From: Leif Lindholm <leif.lindholm@linaro.org>
Date: Wed, 4 Dec 2013 13:09:21 +0000
Subject: [PATCH 1/2] fdt: add grub_fdt_create_empty_tree() function
Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
---
grub-core/lib/fdt.c | 39 +++++++++++++++++++++++++++++++++++++++
include/grub/fdt.h | 1 +
2 files changed, 40 insertions(+)
diff --git a/grub-core/lib/fdt.c b/grub-core/lib/fdt.c
index 9f34dc7..581a118 100644
--- a/grub-core/lib/fdt.c
+++ b/grub-core/lib/fdt.c
@@ -423,3 +423,42 @@ int grub_fdt_set_prop (void *fdt, unsigned int nodeoffset, const char *name,
grub_memcpy (prop + 3, val, len);
return 0;
}
+
+struct empty_tree {
+ grub_fdt_header_t header;
+ grub_uint64_t empty_rsvmap[2];
+ struct {
+ grub_uint32_t prop_start;
+ grub_uint8_t name[1];
+ grub_uint32_t prop_end;
+ grub_uint32_t node_end;
+ } empty_node;
+};
+
+int
+grub_fdt_create_empty_tree (void *fdt, unsigned int size)
+{
+ struct empty_tree *et;
+
+ if (size < sizeof (struct empty_tree))
+ return -1;
+
+ grub_memset (fdt, 0, size);
+ et = fdt;
+
+ et->empty_node.node_end = grub_cpu_to_be32 (FDT_END);
+ et->empty_node.prop_end = grub_cpu_to_be32 (FDT_END_NODE);
+ et->empty_node.prop_start = grub_cpu_to_be32 (FDT_BEGIN_NODE);
+ ((struct empty_tree *) fdt)->header.off_mem_rsvmap =
+ grub_cpu_to_be32 (ALIGN_UP (sizeof (grub_fdt_header_t), 8));
+
+ grub_fdt_set_off_dt_strings (fdt, sizeof (struct empty_tree));
+ grub_fdt_set_off_dt_struct (fdt, sizeof (grub_fdt_header_t) + 16);
+ grub_fdt_set_version (fdt, FDT_SUPPORTED_VERSION);
+ grub_fdt_set_last_comp_version (fdt, FDT_SUPPORTED_VERSION);
+ grub_fdt_set_size_dt_struct (fdt, sizeof (et->empty_node));
+ grub_fdt_set_totalsize (fdt, size);
+ grub_fdt_set_magic (fdt, FDT_MAGIC);
+
+ return 0;
+}
diff --git a/include/grub/fdt.h b/include/grub/fdt.h
index 2ad0536..06eec19 100644
--- a/include/grub/fdt.h
+++ b/include/grub/fdt.h
@@ -82,6 +82,7 @@ typedef struct {
#define grub_fdt_set_size_dt_struct(fdt, value) \
grub_fdt_set_header(fdt, size_dt_struct, value)
+int grub_fdt_create_empty_tree (void *fdt, unsigned int size);
int grub_fdt_check_header (void *fdt, unsigned int size);
int grub_fdt_find_subnode (const void *fdt, unsigned int parentoffset,
const char *name);
--
1.8.4.2
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