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#
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#
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# Copyright (C) 2005 Ondrej Palkovsky
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# Copyright (C) 2005 Ondrej Palkovsky
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# Copyright (C) 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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# are met:
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# are met:
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#include <arch/cpuid.h>
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#include <arch/cpuid.h>
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#define START_STACK	(BOOT_OFFSET - BOOT_STACK_SIZE)
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#define START_STACK	(BOOT_OFFSET - BOOT_STACK_SIZE)
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.section K_TEXT_START, "ax"
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.section K_TEXT_START, "ax"
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# .code16
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# .global kernel_image_start
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# .global multiboot_image_start
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# kernel_image_start:
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# 	movl $0x80000000, %eax
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# 	cpuid
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# 	cmp $0x80000000, %eax 	# any function > 80000000h?
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# 	jbe no_long_mode
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# 	movl $(AMD_CPUID_EXTENDED), %eax # Extended function code 80000001
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# 	cpuid
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# 	bt $29, %edx 		# Test if long mode is supported.
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# 	jnc no_long_mode
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#
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#
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# no_long_mode:
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# 1:
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# 	jmp 1b
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#
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.code32
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.code32
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.align 4
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.align 4
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.global multiboot_image_start
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.global multiboot_image_start
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multiboot_header:
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multiboot_header:
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	.long MULTIBOOT_HEADER_MAGIC
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	.long MULTIBOOT_HEADER_MAGIC
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	movl %ebx, grub_ebx
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	movl %ebx, grub_ebx
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	# Protected 32-bit. We want to reuse the code-seg descriptor,
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	# Protected 32-bit. We want to reuse the code-seg descriptor,
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	# the Default operand size must not be 1 when entering long mode
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	# the Default operand size must not be 1 when entering long mode
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	movl $0x80000000, %eax
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 	cpuid
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 	cmp $0x80000000, %eax						# any function > 80000000h?
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	jbe long_mode_unsupported
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	movl $(AMD_CPUID_EXTENDED), %eax			# Extended function code 80000001
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	cpuid
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	bt $29, %edx								# Test if long mode is supported.
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 	jc long_mode_supported
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	long_mode_unsupported:
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		cli
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		hlt
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	long_mode_supported:
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	# Enable 64-bit page transaltion entries - CR4.PAE = 1.
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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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	# Paging is not enabled until after long mode is enabled
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	movl %cr4, %eax
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	movl %cr4, %eax
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	btsl $5, %eax
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	btsl $5, %eax
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		mmap_invalid:
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		mmap_invalid:
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		movl %edx, e820counter
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		movl %edx, e820counter
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	invalid_boot:
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	invalid_boot:
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#ifdef CONFIG_SMP
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	# copy AP bootstrap routines below 1 MB
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	movq $BOOT_OFFSET, %rsi
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	movq $AP_BOOT_OFFSET, %rdi
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	movq $_hardcoded_unmapped_size, %rcx
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	cld
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	rep movsb
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#endif
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	call main_bsp   # never returns
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	call main_bsp   # never returns
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	cli
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	cli
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	hlt
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	hlt
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