arm, device tree: parse the DTB for RAM location and size

Prior to setting up the page tables, parse the DTB for the location
and size of RAM.

Use this information to get the physical address to relocate Xen to in
setup_pagetables().

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Acked-by: Tim Deegan <tim@xen.org>
Committed-by: Ian Campbell <ian.campbell@citrix.com>

1 files changed, 36 insertions, 0 deletions

diff --git a/xen/include/xen/device_tree.h b/xen/include/xen/device_tree.h
new file mode 100644
index 0000000000..ae3e344495
--- /dev/null
+++ b/xen/include/xen/device_tree.h
@@ -0,0 +1,36 @@
+/*
+ * Device Tree
+ *
+ * Copyright (C) 2012 Citrix Systems, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef __XEN_DEVICE_TREE_H__
+#define __XEN_DEVICE_TREE_H__
+
+#include <xen/types.h>
+
+#define NR_MEM_BANKS 8
+
+struct membank {
+    paddr_t start;
+    paddr_t size;
+};
+
+struct dt_mem_info {
+    int nr_banks;
+    struct membank bank[NR_MEM_BANKS];
+};
+
+struct dt_early_info {
+    struct dt_mem_info mem;
+};
+
+extern struct dt_early_info early_info;
+
+void device_tree_early_init(const void *fdt);
+paddr_t device_tree_get_xen_paddr(void);
+
+#endif