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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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# 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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#
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#
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# - Redistributions of source code must retain the above copyright
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# - Redistributions of source code must retain the above copyright
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#   notice, this list of conditions and the following disclaimer.
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#   notice, this list of conditions and the following disclaimer.
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# - Redistributions in binary form must reproduce the above copyright
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# - Redistributions in binary form must reproduce the above copyright
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#   notice, this list of conditions and the following disclaimer in the
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#   notice, this list of conditions and the following disclaimer in the
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#   documentation and/or other materials provided with the distribution.
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#   documentation and/or other materials provided with the distribution.
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# - The name of the author may not be used to endorse or promote products
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# - The name of the author may not be used to endorse or promote products
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#   derived from this software without specific prior written permission.
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#   derived from this software without specific prior written permission.
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#
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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#
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#
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#
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# Init code for application processors.
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# Init code for application processors.
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#
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#
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.section K_TEXT_START_2
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.section K_TEXT_START_2
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#ifdef __SMP__
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#ifdef __SMP__
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.global ap_boot
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.global ap_boot
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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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# This piece of code is real-mode and is meant to be alligned at 4K boundary.
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# This piece of code is real-mode and is meant to be alligned at 4K boundary.
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# The requirement for such an alignment comes from MP Specification's STARTUP IPI
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# The requirement for such an alignment comes from MP Specification's STARTUP IPI
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# requirements.
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# requirements.
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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__ */
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