x86: Refactor the zboot innards so they can be reused with a vboot image

If vboot successfully verifies a kernel, it will leave it in place and
basically ready to boot. The zeropage table which is part of the x86 boot
protocol is at the end of the kernel, though, instead of the beginning, and
because the image is already in place there's no need to copy it around.
This change refactors the code which implements the zboot command so that
the configuration of the zeropage table and loading the pieces of the
kernel into memory are done separately. Also, because the command line goes
before the zeropage table in vboot which is somewhat incompatible with the
normal protocol, where to put the command line is a now a parameter instead
of being hard coded.

Signed-off-by: Gabe Black <gabeblack@chromium.org>

1 files changed, 5 insertions, 3 deletions

diff --git a/arch/x86/include/asm/zimage.h b/arch/x86/include/asm/zimage.h
index 3a68bb0..f03ea80 100644
--- a/arch/x86/include/asm/zimage.h
+++ b/arch/x86/include/asm/zimage.h
@@ -24,6 +24,7 @@
 #ifndef _ASM_ZIMAGE_H_
 #define _ASM_ZIMAGE_H_
 
+#include <asm/bootparam.h>
 #include <asm/e820.h>
 
 /* linux i386 zImage/bzImage header. Offsets relative to
@@ -49,9 +50,10 @@
 /* Implementation defined function to install an e820 map. */
 unsigned install_e820_map(unsigned max_entries, struct e820entry *);
 
-void *load_zimage(char *image, unsigned long kernel_size,
-		  unsigned long initrd_addr, unsigned long initrd_size,
-		  int auto_boot, void **load_address);
+struct boot_params *load_zimage(char *image, unsigned long kernel_size,
+				void **load_address);
+int setup_zimage(struct boot_params *setup_base, char *cmd_line, int auto_boot,
+		 unsigned long initrd_addr, unsigned long initrd_size);
 
 void boot_zimage(void *setup_base, void *load_address);