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#
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# Copyright (c) 2008 Jakub Jermar
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# Copyright (c) 2005-2006 Martin Decky
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# All rights reserved.
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#
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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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# are met:
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#
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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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# - 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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#   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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#   derived from this software without specific prior written permission.
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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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# 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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# 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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# 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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# 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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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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#
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# Init code for application processors.
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#
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#include <arch/boot/boot.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/pm.h>
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#include <arch/cpu.h>
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#include <arch/cpuid.h>
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.section K_TEXT_START, "ax"
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#ifdef CONFIG_SMP
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.global unmapped_ap_boot
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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
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# IPI requirements.
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.align 4096
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unmapped_ap_boot:
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.code16
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	cli
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	xorw %ax, %ax
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	movw %ax, %ds
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	lgdtl ap_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 $gdtselector(KTEXT32_DES), $jump_to_kernel - BOOT_OFFSET + AP_BOOT_OFFSET
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jump_to_kernel:
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.code32
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	movw $gdtselector(KDATA_DES), %ax
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	movw %ax, %ds
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	movw %ax, %es
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	movw %ax, %ss
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	movw $gdtselector(UDATA_DES), %ax
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	movw %ax, %gs
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	# Enable 64-bit page transaltion entries - CR4.PAE = 1.
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	# Paging is not enabled until after long mode is enabled
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	movl %cr4, %eax
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	btsl $5, %eax
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	movl %eax, %cr4
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	leal ptl_0, %eax
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	movl %eax, %cr3
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	# Enable long mode
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	movl $EFER_MSR_NUM, %ecx	# EFER MSR number
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	rdmsr				# Read EFER
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	btsl $AMD_LME_FLAG, %eax	# Set LME=1
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	wrmsr				# Write EFER
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	# Enable paging to activate long mode (set CR0.PG=1)
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	movl %cr0, %eax
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	btsl $31, %eax
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	movl %eax, %cr0
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	# At this point we are in compatibility mode
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	jmpl $gdtselector(KTEXT_DES), $start64 - BOOT_OFFSET + AP_BOOT_OFFSET
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.code64
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start64:
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	movq (ctx), %rsp
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	call main_ap - AP_BOOT_OFFSET + BOOT_OFFSET   # never returns
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#endif /* CONFIG_SMP */
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.section K_DATA_START, "aw", @progbits
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#ifdef CONFIG_SMP
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.global unmapped_ap_gdtr
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unmapped_ap_gdtr:
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	.word 0
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	.long 0
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#endif /* CONFIG_SMP */