diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h
index 8b5ecc1..b37ad3a 100644
--- a/include/linux/of_fdt.h
+++ b/include/linux/of_fdt.h
@@ -23,4 +23,36 @@
 
 #define OF_DT_VERSION		0x10
 
+#ifndef __ASSEMBLY__
+/*
+ * This is what gets passed to the kernel by prom_init or kexec
+ *
+ * The dt struct contains the device tree structure, full pathes and
+ * property contents. The dt strings contain a separate block with just
+ * the strings for the property names, and is fully page aligned and
+ * self contained in a page, so that it can be kept around by the kernel,
+ * each property name appears only once in this page (cheap compression)
+ *
+ * the mem_rsvmap contains a map of reserved ranges of physical memory,
+ * passing it here instead of in the device-tree itself greatly simplifies
+ * the job of everybody. It's just a list of u64 pairs (base/size) that
+ * ends when size is 0
+ */
+struct boot_param_header {
+	u32	magic;			/* magic word OF_DT_HEADER */
+	u32	totalsize;		/* total size of DT block */
+	u32	off_dt_struct;		/* offset to structure */
+	u32	off_dt_strings;		/* offset to strings */
+	u32	off_mem_rsvmap;		/* offset to memory reserve map */
+	u32	version;		/* format version */
+	u32	last_comp_version;	/* last compatible version */
+	/* version 2 fields below */
+	u32	boot_cpuid_phys;	/* Physical CPU id we're booting on */
+	/* version 3 fields below */
+	u32	dt_strings_size;	/* size of the DT strings block */
+	/* version 17 fields below */
+	u32	dt_struct_size;		/* size of the DT structure block */
+};
+
+#endif /* __ASSEMBLY__ */
 #endif /* _LINUX_OF_FDT_H */