powerpc: Setup OF properties for ppc32 kexec

Refactor the setting of kexec OF properties, moving the common code
from machine_kexec_64.c to machine_kexec.c where it can be used on
both ppc64 and ppc32.  This is needed for kexec to work on ppc32
platforms.

Signed-off-by: Dale Farnsworth <dale@farnsworth.org>
Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/kernel/machine_kexec.c

@@ -13,8 +13,10 @@
 #include <linux/reboot.h>
 #include <linux/threads.h>
 #include <linux/lmb.h>
+#include <linux/of.h>
 #include <asm/machdep.h>
 #include <asm/prom.h>
+#include <asm/sections.h>
 
 void machine_crash_shutdown(struct pt_regs *regs)
 {
@@ -118,3 +120,35 @@ int overlaps_crashkernel(unsigned long start, unsigned long size)
 {
 	return (start + size) > crashk_res.start && start <= crashk_res.end;
 }
+
+/* Values we need to export to the second kernel via the device tree. */
+static unsigned long kernel_end;
+
+static struct property kernel_end_prop = {
+	.name = "linux,kernel-end",
+	.length = sizeof(unsigned long),
+	.value = &kernel_end,
+};
+
+static int __init kexec_setup(void)
+{
+	struct device_node *node;
+	struct property *prop;
+
+	node = of_find_node_by_path("/chosen");
+	if (!node)
+		return -ENOENT;
+
+	/* remove any stale properties so ours can be found */
+	prop = of_find_property(node, kernel_end_prop.name, NULL);
+	if (prop)
+		prom_remove_property(node, prop);
+
+	/* information needed by userspace when using default_machine_kexec */
+	kernel_end = __pa(_end);
+	prom_add_property(node, &kernel_end_prop);
+
+	of_node_put(node);
+	return 0;
+}
+late_initcall(kexec_setup);

arch/powerpc/kernel/machine_kexec_64.c

@@ -289,7 +289,7 @@ void default_machine_kexec(struct kimage *image)
 }
 
 /* Values we need to export to the second kernel via the device tree. */
-static unsigned long htab_base, kernel_end;
+static unsigned long htab_base;
 
 static struct property htab_base_prop = {
 	.name = "linux,htab-base",
@@ -303,45 +303,31 @@ static struct property htab_size_prop = {
 	.value = &htab_size_bytes,
 };
 
-static struct property kernel_end_prop = {
-	.name = "linux,kernel-end",
-	.length = sizeof(unsigned long),
-	.value = &kernel_end,
-};
-
 static void __init export_htab_values(void)
 {
 	struct device_node *node;
 	struct property *prop;
 
+	/* On machines with no htab htab_address is NULL */
+	if (!htab_address)
+		return;
+
 	node = of_find_node_by_path("/chosen");
 	if (!node)
 		return;
 
 	/* remove any stale propertys so ours can be found */
-	prop = of_find_property(node, kernel_end_prop.name, NULL);
-	if (prop)
-		prom_remove_property(node, prop);
 	prop = of_find_property(node, htab_base_prop.name, NULL);
 	if (prop)
 		prom_remove_property(node, prop);
 	prop = of_find_property(node, htab_size_prop.name, NULL);
 	if (prop)
 		prom_remove_property(node, prop);
 
-	/* information needed by userspace when using default_machine_kexec */
-	kernel_end = __pa(_end);
-	prom_add_property(node, &kernel_end_prop);
-
-	/* On machines with no htab htab_address is NULL */
-	if (NULL == htab_address)
-		goto out;
-
 	htab_base = __pa(htab_address);
 	prom_add_property(node, &htab_base_prop);
 	prom_add_property(node, &htab_size_prop);
 
- out:
 	of_node_put(node);
 }