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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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.section K_TEXT_START
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.section K_TEXT_START
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.global kernel_image_start
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.global kernel_image_start
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.code16
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.code16
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#
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#
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# This is where we require any SPARTAN-kernel-compatible boot loader
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# This is where we require any SPARTAN-kernel-compatible boot loader
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# to pass control in real mode.
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# to pass control in real mode.
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#
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#
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# Protected mode tables are statically initialised during compile
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# Protected mode tables are statically initialised during compile
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# time. So we can just load the respective table registers and
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# time. So we can just load the respective table registers and
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# switch to protected mode.
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# switch to protected mode.
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#
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#
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kernel_image_start:
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kernel_image_start:
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	cli
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	xorw %ax,%ax
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	movw %ax,%ds
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	movw %ax,%ss            # initialize stack segment register
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	movl $0x7c00,%esp	# initialize stack pointer
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	call memmap_arch_init
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	mov $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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	mov $0x80000001, %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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# Fill out GDTR.base, IDTR.base
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meeting_point:
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	leal gdtr, %eax
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	movl gdt_addr, %ebx
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.code32
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	movl %ebx, 2(%eax)
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	movl idt_addr, %ebx
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	leal idtr, %eax
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	movl %ebx, 2(%eax)
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# Load gdtr, idtr
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	lgdt gdtr
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	lidt idtr
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	mov $1, %eax    # Enable protected mode (CR0.PE = 1)
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.section K_DATA_START
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	mov %eax, %cr0
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	jmpl $8, $now_in_prot
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now_in_prot:
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no_long_mode:
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1:
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	jmp 1b
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.section K_DATA_START
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.align 4096
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.align 4096
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page_directory:
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page_directory:
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	.space 4096, 0
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	.space 4096, 0
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gdt_addr:
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	.quad gdt + 0x80000000
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idt_addr:
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	.quad idt + 0x80000000
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