Merge sparc grub-mkimage into generic grub-mkimage and a.out support.

	Merge sparc grub-mkimage into generic grub-mkimage and a.out support.

	* boot/sparc64/ieee1275/boot.S (boot_continue): Use SCRATCH_PAD_BOOT
	as scratch.
	* boot/sparc64/ieee1275/diskboot.S (after_info_block): Use
	SCRATCH_PAD_DISKBOOT as scratch.
	(bootit): Pass Openfirmware pointer in %o4.
	* conf/sparc64-ieee1275.rmk (kernel_img_LDFLAGS): Link at 0x4400 instead
	of 0x200000.
	(grub_mkimage_SOURCES): Replace util/sparc64/ieee1275/grub-mkimage.c
	with util/grub-mkrawimage.c.
	* configure.ac: Handle GRUB_MACHINE_SPARC64 and GRUB_MACHINE_MIPS.
	* include/grub/aout.h (AOUT_MID_SUN): New definition.
	(grub_aout_get_type) [GRUB_UTIL]: Removed.
	(grub_aout_load) [GRUB_UTIL]: Likewise.
	* include/grub/kernel.h (grub_modules_get_end): New proto.
	* include/grub/sparc64/ieee1275/boot.h (SCRATCH_PAD): Removed.
	(SCRATCH_PAD_BOOT): New definition.
	(SCRATCH_PAD_DISKBOOT): Likewise.
	(GRUB_BOOT_MACHINE_IMAGE_ADDRESS): Set to 0x4400.
	* include/grub/sparc64/ieee1275/ieee1275.h
	(grub_ieee1275_original_stack): New variable
	* include/grub/sparc64/ieee1275/kernel.h (GRUB_KERNEL_MACHINE_RAW_SIZE):
	New definition
	(GRUB_KERNEL_MACHINE_STACK_SIZE): Likewise.
	(GRUB_PLATFORM_IMAGE_FORMATS): Likewise.
	(GRUB_PLATFORM_IMAGE_DEFAULT_FORMAT): Likewise.
	(GRUB_PLATFORM_IMAGE_DEFAULT): Likewise.
	(GRUB_PLATFORM_IMAGE_RAW): Likewise.
	(GRUB_PLATFORM_IMAGE_AOUT): Likewise.
	(grub_platform_image_format_t): New type.
	* kern/mips/yeeloong/init.c (grub_modules_get_end): Move from here ...
	* kern/main.c (grub_modules_get_end)
	[GRUB_MACHINE_MIPS_YEELOONG || GRUB_MACHINE_SPARC64]: ... here.
	* kern/sparc64/ieee1275/crt0.S: Store firmware entry point in %o0.
	(codestart): Switch stacks.
	* kern/sparc64/ieee1275/init.c (grub_ieee1275_original_stack): New
	variable.
	(grub_heap_init): Use grub_modules_get_end.
	* loader/sparc64/ieee1275/linux.c (grub_linux_boot): Restore original
	stack.
	* util/grub-mkrawimage.c (generate_image): Support sparc64.
	(main): Likewise.
	* util/sparc64/ieee1275/grub-mkimage.c: Removed.