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98 cejka 1 
/*
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 * Copyright (C) 2005 Josef Cejka
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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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 */
95 cejka 28 
 
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#include <arch/boot/memmap.h>
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98 cejka 32 
E820_RECORD_SIZE = MEMMAP_E820_RECORD_SIZE
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E820_MAX_RECORDS = MEMMAP_E820_MAX_RECORDS
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E820_SMAP = 0x534d4150
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.global memmap_arch_init
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.code16
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.section K_TEXT_START_2
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memmap_arch_init:
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e820begin:
99 jermar 44 
	xorl	%ebx,%ebx	# during first call, ebx must be 0
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	movw	$e820table,%di
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	movb	$E820_MAX_RECORDS,(e820counter)
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e820loop:
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	movl	$E820_SMAP,%edx 	# constrol sequence "SMAP"
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	pushw	%ds
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	popw	%es		# e820 buffer address
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	movl	$0xe820,%eax		# service
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	movl	$E820_RECORD_SIZE,%ecx
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	int 	$0x15
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	jc		e820end
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99 jermar 59 
	cmpl	$E820_SMAP,%eax		# verifying BIOS
98 cejka 60 
	jne		e820end
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	movw	%di,%ax		# next record
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	addw	$E820_RECORD_SIZE,%ax
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	movw	%ax,%di
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101 cejka 66 
	decb	(e820counter) # buffer is full
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	jz	e820end
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	cmpl	$0,%ebx
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	jne	e820loop
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98 cejka 72 
e820end:
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	movb	(e820counter),%al
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	negb	%al
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	addb	$32,%al
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	movb	%al,(e820counter) # store # of valid entries in e820counter
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	ret
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e820counter:
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	.byte 0
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e820table:
99 jermar 86 
	.space  (32*E820_RECORD_SIZE),0 # space for 32 records, each E820_RECORD_SIZE bytes long