mips: add dtb loading support

Kexec for MIPS currently does not support loading devicetrees, unless
they are embedded in the kernel elf file.

Add an option to either pass a new dtb file or - if not specified - to
be generated from existing device tree on the device. As new generic
platforms require a dtb to be passed separately this is required for
such platforms and will be ignored by the kernel otherwise.

Generic kexec infrastructure for dtb support is used.

Signed-off-by: Marcin Nowakowski <marcin.nowakowski@imgtec.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Signed-off-by: Simon Horman <horms@verge.net.au>

1 files changed, 9 insertions, 0 deletions

diff --git a/kexec/arch/mips/kexec-mips.h b/kexec/arch/mips/kexec-mips.h
index 2991b2d..a609fb5 100644
--- a/kexec/arch/mips/kexec-mips.h
+++ b/kexec/arch/mips/kexec-mips.h
@@ -1,6 +1,11 @@
 #ifndef KEXEC_MIPS_H
 #define KEXEC_MIPS_H
 
+#include <sys/types.h>
+
+#define BOOT_BLOCK_VERSION 17
+#define BOOT_BLOCK_LAST_COMP_VERSION 16
+
 #define MAX_MEMORY_RANGES  64
 #define MAX_LINE          160
 
@@ -14,7 +19,11 @@ void elf_mips_usage(void);
 
 struct arch_options_t {
 	char *command_line;
+	char *dtb_file;
 	int core_header_type;
 };
 
+extern struct memory_ranges usablemem_rgns;
+extern off_t initrd_base, initrd_size;
+
 #endif /* KEXEC_MIPS_H */