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Rev 1787 Rev 1811
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#define START_STACK (BOOT_OFFSET - BOOT_STACK_SIZE)
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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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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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.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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multiboot_image_start:
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multiboot_image_start:
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	movl $START_STACK, %esp			# initialize stack pointer
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	movl $START_STACK, %esp			# initialize stack pointer
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	lgdt KA2PA(bootstrap_gdtr)		# 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 $selector(KDATA_DES), %cx
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	movw %cx, %es
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	movw %cx, %es
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	movw %cx, %fs
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	movw %cx, %fs
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	movw %cx, %gs
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	movw %cx, %gs
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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
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	jmpl $selector(KTEXT_DES), $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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	mov %eax, %cr0
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	mov %eax, %cr0
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	jmp 9f
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	jmp 9f
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9:
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9:
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	ljmpl $KTEXT, $(vesa_init_protect - vesa_init + VESA_INIT_SEGMENT << 4)
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	ljmpl $selector(KTEXT_DES), $(vesa_init_protect - vesa_init + VESA_INIT_SEGMENT << 4)
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0:# No prefered mode found
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0:# No prefered mode found
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	mov $0x111, %cx
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	mov $0x111, %cx
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	push %di
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	push %di
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	push %cx
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	push %cx
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.code32
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.code32
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vesa_init_protect:
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vesa_init_protect:
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	popl %esp
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	popl %esp
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	movw $KDATA, %cx
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	movw $selector(KDATA_DES), %cx
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	movw %cx, %es
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	movw %cx, %es
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	movw %cx, %fs
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	movw %cx, %fs
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	movw %cx, %gs
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	movw %cx, %gs
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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, $vesa_meeting_point
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	jmpl $selector(KTEXT_DES), $vesa_meeting_point
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.align 4
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.align 4
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e_vesa_init:
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e_vesa_init:
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#endif
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#endif
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