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-rw-r--r--arch/powerpc/kernel/prom.c27
-rw-r--r--arch/powerpc/kernel/setup_64.c3
-rw-r--r--include/asm-powerpc/prom.h2
3 files changed, 32 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 535a33e4aa3..2b062853bcc 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -1922,3 +1922,30 @@ int prom_update_property(struct device_node *np,
return 0;
}
+
+#ifdef CONFIG_KEXEC
+/* We may have allocated the flat device tree inside the crash kernel region
+ * in prom_init. If so we need to move it out into regular memory. */
+void kdump_move_device_tree(void)
+{
+ unsigned long start, end;
+ struct boot_param_header *new;
+
+ start = __pa((unsigned long)initial_boot_params);
+ end = start + initial_boot_params->totalsize;
+
+ if (end < crashk_res.start || start > crashk_res.end)
+ return;
+
+ new = (struct boot_param_header*)
+ __va(lmb_alloc(initial_boot_params->totalsize, PAGE_SIZE));
+
+ memcpy(new, initial_boot_params, initial_boot_params->totalsize);
+
+ initial_boot_params = new;
+
+ DBG("Flat device tree blob moved to %p\n", initial_boot_params);
+
+ /* XXX should we unreserve the old DT? */
+}
+#endif /* CONFIG_KEXEC */
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index e29b275e09e..a717dff695e 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -398,6 +398,9 @@ void __init setup_system(void)
{
DBG(" -> setup_system()\n");
+#ifdef CONFIG_KEXEC
+ kdump_move_device_tree();
+#endif
/*
* Unflatten the device-tree passed by prom_init or kexec
*/
diff --git a/include/asm-powerpc/prom.h b/include/asm-powerpc/prom.h
index 5b2bd4eefb0..cbd297f44cc 100644
--- a/include/asm-powerpc/prom.h
+++ b/include/asm-powerpc/prom.h
@@ -222,5 +222,7 @@ extern int of_address_to_resource(struct device_node *dev, int index,
extern int of_pci_address_to_resource(struct device_node *dev, int bar,
struct resource *r);
+extern void kdump_move_device_tree(void);
+
#endif /* __KERNEL__ */
#endif /* _POWERPC_PROM_H */