x86/boot/header.S

28 BOOTSEG		= 0x07C0		/* original address of boot-sector */
29 SYSSEG		= 0x1000		/* historical load address >> 4 */
39 	.set	salign, 0x1000
40 	.set	falign, 0x200
47 	.org	0x38
62 	.set	image_file_add_flags, 0
67 	.long	0 				# TimeDateStamp
68 	.long	0				# PointerToSymbolTable
78 	.byte	0x02				# MajorLinkerVersion
79 	.byte	0x14				# MinorLinkerVersion
84 	.long	0				# SizeOfUninitializedData
90 	.long	0				# data
95 	.long	0				# ImageBase
97 	.quad	0				# ImageBase
101 	.word	0				# MajorOperatingSystemVersion
102 	.word	0				# MinorOperatingSystemVersion
105 	.word	0				# MajorSubsystemVersion
106 	.word	0				# MinorSubsystemVersion
107 	.long	0				# Win32VersionValue
112 	.long	0				# CheckSum
116 	.long	0				# SizeOfStackReserve
117 	.long	0				# SizeOfStackCommit
118 	.long	0				# SizeOfHeapReserve
119 	.long	0				# SizeOfHeapCommit
121 	.quad	0				# SizeOfStackReserve
122 	.quad	0				# SizeOfStackCommit
123 	.quad	0				# SizeOfHeapReserve
124 	.quad	0				# SizeOfHeapCommit
126 	.long	0				# LoaderFlags
129 	.quad	0				# ExportTable
130 	.quad	0				# ImportTable
131 	.quad	0				# ResourceTable
132 	.quad	0				# ExceptionTable
133 	.quad	0				# CertificationTable
134 	.quad	0				# BaseRelocationTable
139 	.byte	0
140 	.byte	0
146 	.long	0, 0, 0
159 	.long	0, 0, 0
173 	.byte	0x1				# Version
177 	.byte	0x0				# Sentinel
183 	.byte	0
184 	.byte	0
185 	.byte	0
191 	.long	0				# PointerToRelocations
192 	.long	0				# PointerToLineNumbers
193 	.word	0				# NumberOfRelocations
194 	.word	0				# NumberOfLineNumbers
199 	.ascii	".data\0\0\0"
205 	.long	0, 0, 0
218 sentinel:	.byte 0xff, 0xff        /* Used to detect broken loaders */
225 ram_size:	.word 0			/* Obsolete */
227 root_dev:	.word 0			/* Default to major/minor 0/0 */
228 boot_flag:	.word 0xAA55
237 		.byte	0xeb		# short (2-byte) jump
244 		.word	0x020f		# header version number (>= 0x0105)
247 realmode_swtch:	.word	0, 0		# default_switch, SETUPSEG
255 type_of_loader:	.byte	0		# 0 means ancient bootloader, newer
264 setup_move_size: .word  0x8000		# size to move, when setup is not
265 					# loaded at 0x90000. We will move setup
266 					# to 0x90000 then just before jumping
273 		.long	0x100000	# 0x100000 = default for big kernel
275 ramdisk_image:	.long	0		# address of loaded ramdisk image
280 ramdisk_size:	.long	0		# its size in bytes
283 		.long	0		# obsolete
286 					# (Header version 0x0201 or later)
292 		.byte	0		# Extended boot loader version
294 		.byte	0		# Extended boot loader type
296 cmd_line_ptr:	.long	0		# (Header version 0x0202 or later)
302 					# memory (0xa0000), or it may
307 					# 0x90000 segment; the setup
309 					# low memory 0x10000 or higher.
311 initrd_addr_max: .long 0x7fffffff
312 					# (Header version 0x0203 or later)
325 relocatable_kernel:    .byte 0
333 # define XLF0 0
340 # define XLF1 0
354 # define XLF23 0
360 # define XLF4 0
370 #define XLF56 0
379 hardware_subarch:	.long 0			# subarchitecture, added with 2.07
380 						# default to 0 for normal x86 PC
382 hardware_subarch_data:	.quad 0
387 setup_data:		.quad 0			# 64-bit physical pointer to
517 	.long		0
522 	.long		ZO_efi64_stub_entry - 0x200
524 	.if		ZO_efi32_stub_entry != ZO_efi64_stub_entry - 0x200
566 	movw	$0xfffc, %dx	# Make sure we're not zero
571 # We will have entered with %cs = %ds+0x20, normalize %cs so
579 	cmpl	$0x5a5aaa55, setup_sig