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#

# Copyright (c) 2001-2004 Jakub Jermar

# Copyright (c) 2005-2006 Martin Decky

# All rights reserved.

#

# Redistribution and use in source and binary forms, with or without

# modification, are permitted provided that the following conditions

# are met:

#

# - Redistributions of source code must retain the above copyright

#   notice, this list of conditions and the following disclaimer.

# - Redistributions in binary form must reproduce the above copyright

#   notice, this list of conditions and the following disclaimer in the

#   documentation and/or other materials provided with the distribution.

# - The name of the author may not be used to endorse or promote products

#   derived from this software without specific prior written permission.

#

# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#

#

# Init code for application processors.

#

#include <arch/boot/boot.h>

#include <arch/boot/memmap.h>

#include <arch/mm/page.h>

#include <arch/pm.h>

.section K_TEXT_START, "ax"

#ifdef CONFIG_SMP

.global unmapped_ap_boot

KTEXT=8

KDATA=16

# This piece of code is real-mode and is meant to be alligned at 4K boundary.

# The requirement for such an alignment comes from MP Specification's STARTUP IPI

# requirements.

.align 4096

unmapped_ap_boot:

.code16

	cli

	xorw %ax, %ax

	movw %ax, %ds

	lgdtl ap_gdtr		# initialize Global Descriptor Table register

	movl %cr0, %eax

	orl $1, %eax

	movl %eax, %cr0				# switch to protected mode

	jmpl $KTEXT, $jump_to_kernel - BOOT_OFFSET + AP_BOOT_OFFSET

jump_to_kernel:

.code32

	movw $KDATA, %ax

	movw %ax, %ds

	movw %ax, %es

	movw %ax, %ss

	movl $KA2PA(ctx), %eax			# KA2PA((uintptr_t) &ctx)

	movl (%eax), %esp

	subl $0x80000000, %esp			# KA2PA(ctx.sp)

	call map_kernel					# map kernel and turn paging on

	addl $0x80000000, %esp			# PA2KA(ctx.sp)

	jmpl $KTEXT, $main_ap

#endif /* CONFIG_SMP */

.section K_DATA_START, "aw", @progbits

#ifdef CONFIG_SMP

.global unmapped_ap_gdtr

unmapped_ap_gdtr:

	.word 0

	.long 0

#endif /* CONFIG_SMP */