powerpc/kexec: Add support for FSL-BookE

This adds support kexec on FSL-BookE where the MMU can not be simply
switched off. The code borrows the initial MMU-setup code to create the
identical mapping mapping. The only difference to the original boot code
is the size of the mapping(s) and the executeable address.
The kexec code maps the first 2 GiB of memory in 256 MiB steps. This
should work also on e500v1 boxes.
SMP support is still not available.

(Kumar: Added minor change to build to ifdef CONFIG_PPC_STD_MMU_64 some
code that was PPC64 specific)

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/misc_32.S b/arch/powerpc/kernel/misc_32.S
index 8043d1b73cf0..dc66d52dcff5 100644
--- a/arch/powerpc/kernel/misc_32.S
+++ b/arch/powerpc/kernel/misc_32.S
@@ -711,6 +711,22 @@ relocate_new_kernel:
         /* r4 = reboot_code_buffer */
         /* r5 = start_address      */
 
+#ifdef CONFIG_FSL_BOOKE
+
+        mr      r29, r3
+        mr      r30, r4
+        mr      r31, r5
+
+#define ENTRY_MAPPING_KEXEC_SETUP
+#include "fsl_booke_entry_mapping.S"
+#undef ENTRY_MAPPING_KEXEC_SETUP
+
+        mr      r3, r29
+        mr      r4, r30
+        mr      r5, r31
+
+        li      r0, 0
+#else
         li      r0, 0
 
         /*
@@ -727,6 +743,7 @@ relocate_new_kernel:
         rfi
 
 1:
+#endif
         /* from this point address translation is turned off */
         /* and interrupts are disabled */