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#
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#
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# Copyright (c) 2001-2004 Jakub Jermar
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# Copyright (c) 2008 Jakub Jermar
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# Copyright (c) 2005-2006 Martin Decky
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# Copyright (c) 2005-2006 Martin Decky
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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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#ifdef CONFIG_SMP
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#ifdef CONFIG_SMP
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.global unmapped_ap_boot
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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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# 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
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# requirements.
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# IPI requirements.
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.align 4096
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.align 4096
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unmapped_ap_boot:
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unmapped_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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	lgdtl ap_gdtr		# initialize Global Descriptor Table register
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	lgdtl ap_gdtr		# initialize Global Descriptor Table register
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	movl %cr0, %eax
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	movl %cr0, %eax
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	orl $1, %eax
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	orl $1, %eax
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	movl %eax, %cr0				# switch to protected mode
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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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	jmpl $gdtselector(KTEXT32_DES), $jump_to_kernel - BOOT_OFFSET + AP_BOOT_OFFSET
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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 $gdtselector(KDATA_DES), %ax
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	movw $gdtselector(KDATA_DES), %ax
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	leal ptl_0, %eax
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	leal ptl_0, %eax
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	movl %eax, %cr3
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	movl %eax, %cr3
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	# Enable long mode
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	# Enable long mode
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	movl $EFER_MSR_NUM, %ecx   # EFER MSR number
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	movl $EFER_MSR_NUM, %ecx	# EFER MSR number
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	rdmsr                   # Read EFER
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	rdmsr				# Read EFER
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	btsl $AMD_LME_FLAG, %eax            # Set LME=1
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	btsl $AMD_LME_FLAG, %eax	# Set LME=1
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	wrmsr                   # Write EFER
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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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	# Enable paging to activate long mode (set CR0.PG=1)
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	movl %cr0, %eax
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	movl %cr0, %eax
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	btsl $31, %eax
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	btsl $31, %eax
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	movl %eax, %cr0
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	movl %eax, %cr0
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.section K_DATA_START, "aw", @progbits
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.section K_DATA_START, "aw", @progbits
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#ifdef CONFIG_SMP
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#ifdef CONFIG_SMP
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.global unmapped_ap_gdtr
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.global unmapped_ap_gdtr
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unmapped_ap_gdtr:
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unmapped_ap_gdtr:
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	.word 0
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	.word 0
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	.long 0
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	.long 0
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#endif /* CONFIG_SMP */
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#endif /* CONFIG_SMP */