x86/boot/header.S

1 /* SPDX-License-Identifier: GPL-2.0 */
12  * BIG FAT NOTE: We're in real mode using 64k segments.  Therefore segment
28 BOOTSEG		= 0x07C0		/* original address of boot-sector */
45 	# "MZ", MS-DOS header
92 	.ascii	"Use a boot loader.\r\n"
115 	.word	section_table - optional_header	# SizeOfOptionalHeader
179 	.long	(section_table - .) / 8		# NumberOfRvaAndSizes
211 	# The EFI application loader requires a relocation section
272 	.set	section_count, (. - section_table) / 40
297 		# tries to generate a 3-byte jump here, which causes
299 		.byte	0xeb		# short (2-byte) jump
300 		.byte	start_of_setup-1f
307 					# or else old loadlin-1.5 will fail)
312 		.word	kernel_version-512 # pointing to kernel version string
314 					# with loadlin-1.5 (header v1.5). Don't
330 					# loader knows how much data behind
334 					# start address for 32-bit code.
338 					# Here the loader puts the 32-bit
347 heap_end_ptr:	.word	_end+STACK_SIZE-512
354 		.byte	0		# Extended boot loader version
356 		.byte	0		# Extended boot loader type
359 					# If nonzero, a 32-bit pointer
382 						#required for protected mode
393 # define XLF0 XLF_KERNEL_64			/* 64-bit kernel */
410 #   define XLF23 XLF_EFI_HANDOVER_64		/* 64-bit EFI handover ok */
412 #   define XLF23 XLF_EFI_HANDOVER_32		/* 32-bit EFI handover ok */
437 cmdline_size:   .long   COMMAND_LINE_SIZE-1     #length of the command line,
449 setup_data:		.quad 0			# 64-bit physical pointer to
456 # Getting to provably safe in-place decompression is hard. Worst case
458 # a gzip-compressed kernel as example, to illustrate it:
479 # 1 block occurs every 32K -1 bytes or when there 50% compression
539 # the size-dependent part now grows so fast.
551 # define ZO_z_extract_offset	(ZO_z_output_len + ZO_z_extra_bytes - \
562 #if (ZO__ehead - ZO_startup_32) > ZO_z_extract_offset
563 # define ZO_z_min_extract_offset ((ZO__ehead - ZO_startup_32 + 4095) & ~4095)
568 #define ZO_INIT_SIZE	(ZO__end - ZO_startup_32 + ZO_z_min_extract_offset)
570 #define VO_INIT_SIZE	(VO__end - VO__text)
598 	je	2f		# -> assume %sp is reasonably set
651 	.size	die, .-die