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#
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#
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# Copyright (C) 2001-2004 Jakub Jermar
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# Copyright (C) 2001-2004 Jakub Jermar
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# Copyright (C) 2005-2006 Martin Decky
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# All rights reserved.
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# All rights reserved.
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#
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#
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# Redistribution and use in source and binary forms, with or without
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# modification, are permitted provided that the following conditions
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# are met:
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# are met:
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#include <arch/boot/boot.h>
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#include <arch/boot/boot.h>
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#include <arch/boot/memmap.h>
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#include <arch/boot/memmap.h>
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#include <arch/mm/page.h>
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#include <arch/mm/page.h>
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#include <arch/pm.h>
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#include <arch/pm.h>
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#define START_STACK (BOOT_OFFSET - BOOT_STACK_SIZE)
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.section K_TEXT_START, "ax"
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.section K_TEXT_START, "ax"
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KTEXT=8
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KTEXT=8
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KDATA=16
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KDATA=16
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.code32
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.code32
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.align 4
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.align 4
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.global multiboot_image_start
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multiboot_header:
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multiboot_header:
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	.long MULTIBOOT_HEADER_MAGIC
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	.long MULTIBOOT_HEADER_MAGIC
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	.long MULTIBOOT_HEADER_FLAGS
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	.long MULTIBOOT_HEADER_FLAGS
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	.long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)	# checksum
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	.long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)	# checksum
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	.long multiboot_header + BOOT_OFFSET
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	.long multiboot_header
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	.long unmapped_ktext_start + BOOT_OFFSET
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	.long unmapped_ktext_start
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	.long 0
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	.long 0
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	.long 0
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	.long 0
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	.long multiboot_image_start + BOOT_OFFSET
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	.long multiboot_image_start
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multiboot_image_start:
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multiboot_image_start:
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	movl $BOOTSTRAP_OFFSET - 0x400, %esp				# initialize stack pointer
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	movl $START_STACK, %esp			# initialize stack pointer
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	lgdt protected_bootstrap_gdtr - 0x80000000			# initialize Global Descriptor Table register
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	lgdt KA2PA(bootstrap_gdtr)		# initialize Global Descriptor Table register
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	movw $KDATA, %cx
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	movw $KDATA, %cx
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	movw %cx, %es
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	movw %cx, %es
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	movw %cx, %gs
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	movw %cx, %gs
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	movw %cx, %fs
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	movw %cx, %fs
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	movw %cx, %ds							# kernel data + stack
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	movw %cx, %ds					# kernel data + stack
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	movw %cx, %ss
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	movw %cx, %ss
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	jmpl $KTEXT, $multiboot_meeting_point + BOOT_OFFSET
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	jmpl $KTEXT, $multiboot_meeting_point
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	multiboot_meeting_point:
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	multiboot_meeting_point:
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	pushl %ebx							# save parameters from GRUB
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	pushl %ebx							# save parameters from GRUB
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	pushl %eax
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	pushl %eax
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	movl $BOOTSTRAP_OFFSET + BOOT_OFFSET, %esi
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	movl $BOOTSTRAP_OFFSET, %edi
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	movl $_hardcoded_unmapped_size, %ecx
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	cld
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	rep movsb
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	call map_kernel							# map kernel and turn paging on
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	call map_kernel							# map kernel and turn paging on
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	popl %eax
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	popl %eax
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	popl %ebx
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	popl %ebx
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	cmpl $MULTIBOOT_LOADER_MAGIC, %eax				# compare GRUB signature
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	cmpl $MULTIBOOT_LOADER_MAGIC, %eax				# compare GRUB signature
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		mmap_invalid:
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		mmap_invalid:
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		movl %edx, e820counter
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		movl %edx, e820counter
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	invalid_boot:
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	invalid_boot:
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#ifdef CONFIG_SMP
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	# copy AP bootstrap routines below 1 MB
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	movl $BOOT_OFFSET, %esi
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	movl $AP_BOOT_OFFSET, %edi
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	movl $_hardcoded_unmapped_size, %ecx
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	cld
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	rep movsb
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#endif
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	call main_bsp - BOOT_OFFSET					# never returns
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	call main_bsp								# never returns
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	cli
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	cli
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	hlt
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	hlt
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.global map_kernel
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.global map_kernel
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.section K_DATA_START, "aw", @progbits
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.section K_DATA_START, "aw", @progbits
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.align 4096
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.align 4096
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page_directory:
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page_directory:
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	.space 4096, 0
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	.space 4096, 0
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.global real_bootstrap_gdtr_boot
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real_bootstrap_gdtr_boot:
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	.word selector(GDT_ITEMS)
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	.long KA2PA(gdt)-BOOT_OFFSET
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