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Rev 232 Rev 267
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.align 4096
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.align 4096
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ap_boot:
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ap_boot:
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.code16
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.code16
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	cli
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	cli
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	xorw %ax,%ax
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	xorw %ax, %ax
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	movw %ax,%ds
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	movw %ax, %ds
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	lgdt gdtr			# initialize Global Descriptor Table register
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	lgdt ap_bootstrap_gdtr	# initialize Global Descriptor Table register
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	movl %cr0, %eax
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	orl $1, %eax
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	movl %eax, %cr0			# switch to protected mode
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	jmpl $KTEXT, $jump_to_kernel
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	movl %cr0,%eax
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	orl $1,%eax
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	movl %eax,%cr0			# switch to protected mode
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	jmpl $KTEXT,$jump_to_kernel
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jump_to_kernel:
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jump_to_kernel:
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.code32
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.code32
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	movw $KDATA,%ax
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	movw $KDATA, %ax
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	movw %ax,%ds
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	movw %ax, %ds
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	movw %ax,%es
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	movw %ax, %es
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	movw %ax,%ss
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	movw %ax, %ss
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	movl $(ctx-0x80000000),%eax	# KA2PA((__address) &ctx)
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	movl $(ctx-0x80000000), %eax	# KA2PA((__address) &ctx)
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	movl (%eax),%esp
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	movl (%eax), %esp
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	subl $0x80000000,%esp		# KA2PA(ctx.sp)
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	subl $0x80000000, %esp			# KA2PA(ctx.sp)
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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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	movb $0xd1, %al					# enable A20 using the keyboard controller
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	outb %al, $0x64
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	movb $0xdf, %al
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	outb %al, $0x60
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	jmpl $KTEXT,$main_ap
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	jmpl $KTEXT, $main_ap
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#endif /* __SMP__ */
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#endif /* __SMP__ */