1 files changed, 102 insertions, 0 deletions
diff --git a/src/include/ipxe/fdt.h b/src/include/ipxe/fdt.h
new file mode 100644
index 00000000..97efa100
--- /dev/null
+++ b/src/include/ipxe/fdt.h
@@ -0,0 +1,102 @@
+#ifndef _IPXE_FDT_H
+#define _IPXE_FDT_H
+
+/** @file
+ *
+ * Flattened Device Tree
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#include <stdint.h>
+
+struct net_device;
+
+/** Device tree header */
+struct fdt_header {
+	/** Magic signature */
+	uint32_t magic;
+	/** Total size of device tree */
+	uint32_t totalsize;
+	/** Offset to structure block */
+	uint32_t off_dt_struct;
+	/** Offset to strings block */
+	uint32_t off_dt_strings;
+	/** Offset to memory reservation block */
+	uint32_t off_mem_rsvmap;
+	/** Version of this data structure */
+	uint32_t version;
+	/** Lowest version to which this structure is compatible */
+	uint32_t last_comp_version;
+	/** Physical ID of the boot CPU */
+	uint32_t boot_cpuid_phys;
+	/** Length of string block */
+	uint32_t size_dt_strings;
+	/** Length of structure block */
+	uint32_t size_dt_struct;
+} __attribute__ (( packed ));
+
+/** Magic signature */
+#define FDT_MAGIC 0xd00dfeed
+
+/** Expected device tree version */
+#define FDT_VERSION 16
+
+/** Device tree token */
+typedef uint32_t fdt_token_t;
+
+/** Begin node token */
+#define FDT_BEGIN_NODE 0x00000001
+
+/** End node token */
+#define FDT_END_NODE 0x00000002
+
+/** Property token */
+#define FDT_PROP 0x00000003
+
+/** Property fragment */
+struct fdt_prop {
+	/** Data length */
+	uint32_t len;
+	/** Name offset */
+	uint32_t name_off;
+} __attribute__ (( packed ));
+
+/** NOP token */
+#define FDT_NOP 0x00000004
+
+/** End of structure block */
+#define FDT_END 0x00000009
+
+/** Alignment of structure block */
+#define FDT_STRUCTURE_ALIGN ( sizeof ( fdt_token_t ) )
+
+/** A device tree */
+struct fdt {
+	/** Tree data */
+	union {
+		/** Tree header */
+		const struct fdt_header *hdr;
+		/** Raw data */
+		const void *raw;
+	};
+	/** Length of tree */
+	size_t len;
+	/** Offset to structure block */
+	unsigned int structure;
+	/** Length of structure block */
+	size_t structure_len;
+	/** Offset to strings block */
+	unsigned int strings;
+	/** Length of strings block */
+	size_t strings_len;
+};
+
+extern int fdt_path ( const char *path, unsigned int *offset );
+extern int fdt_alias ( const char *name, unsigned int *offset );
+extern const char * fdt_string ( unsigned int offset, const char *name );
+extern int fdt_mac ( unsigned int offset, struct net_device *netdev );
+extern int register_fdt ( const struct fdt_header *hdr );
+
+#endif /* _IPXE_FDT_H */