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Rev 285 Rev 347
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.code16
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.code16
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.section K_TEXT_START_2
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.section K_TEXT_START_2
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memmap_arch_init:
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memmap_arch_init:
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e820begin:
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e820begin:
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	xorl	%ebx,%ebx	# during first call, ebx must be 0
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	xorl	%ebx,%ebx			# during first call, ebx must be 0
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	movw	%bx,%ds
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	movw	%bx,%es
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	movw	$e820table_boot,%di
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	movw	$e820table_boot,%di
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	movb	$MEMMAP_E820_MAX_RECORDS,e820counter_boot
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	movb	$MEMMAP_E820_MAX_RECORDS,e820counter_boot
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e820loop:
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e820loop:
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	movl	$E820_SMAP,%edx 	# control sequence "SMAP"
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	movl	$E820_SMAP,%edx 		# control sequence "SMAP"
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	movl	$0x0000e820,%eax	# service
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	movl	$0x0000e820,%eax		# service
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	movl	$MEMMAP_E820_RECORD_SIZE,%ecx
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	movl	$MEMMAP_E820_RECORD_SIZE,%ecx
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	int 	$0x15
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	int 	$0x15
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	jc	e820err
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	jc	e820err
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	cmpl	$E820_SMAP,%eax		# verifying BIOS
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	cmpl	$E820_SMAP,%eax			# verifying BIOS
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	jne	e820err
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	jne	e820err
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	cmpl	$MEMMAP_E820_RECORD_SIZE,%ecx
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	cmpl	$MEMMAP_E820_RECORD_SIZE,%ecx
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	jne	e820err			# bad record size - bug in bios
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	jne	e820err				# bad record size - bug in bios
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	movw	%di,%ax		# next record
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	movw	%di,%ax				# next record
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	addw	$MEMMAP_E820_RECORD_SIZE,%ax
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	addw	$MEMMAP_E820_RECORD_SIZE,%ax
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	movw	%ax,%di
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	movw	%ax,%di
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	decb	e820counter_boot # buffer is full
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	decb	e820counter_boot 		# buffer is full
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	jz	e820end
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	jz	e820end
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	cmpl	$0,%ebx
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	testl	%ebx,%ebx
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	jne	e820loop
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	jnz	e820loop
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e820end:
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e820end:
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	movb	$MEMMAP_E820_MAX_RECORDS,%al
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	movb	$MEMMAP_E820_MAX_RECORDS,%al
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	subb	e820counter_boot,%al
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	subb	e820counter_boot,%al
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	movb	%al,e820counter_boot # store # of valid entries in e820counter
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	movb	%al,e820counter_boot 		# store # of valid entries in e820counter
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	jmp	e801begin
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	jmp	e801begin
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e820err:
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e820err:
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	movb	$0,e820counter_boot
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	movb	$0,e820counter_boot
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	stc
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	stc
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	int	$0x15
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	int	$0x15
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	jc	e801end
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	jc	e801end
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			# fix problem with some BIOSes which use ax:bx rather than cx:dx
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	# fix problem with some BIOSes which use ax:bx rather than cx:dx
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	testw	%cx,%cx
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	testw	%cx,%cx
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	jnz	e801cxdx
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	jnz	e801cxdx
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	testw	%dx,%dx
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	testw	%dx,%dx
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	jnz	e801cxdx
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	jnz	e801cxdx
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e801cxdx:
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e801cxdx:
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	andl	$0xffff,%edx
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	andl	$0xffff,%edx
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	shll	$6,%edx
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	shll	$6,%edx
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	andl	$0xffff,%ecx
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	andl	$0xffff,%ecx
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	addl	%ecx,%edx
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	addl	%ecx,%edx
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	addl	$0x0400,%edx  # add lower 1 MB - it's not included by e801 method
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	addl	$0x0400,%edx  			# add lower 1 MB - it's not included by e801 method
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	movl	%edx,e801memorysize
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	movl	%edx,e801memorysize
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e801end:
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e801end:
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	ret
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	ret
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.section K_DATA_START
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	#memory size in 1 kb chunks
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#memory size in 1 kb chunks
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e801memorysize:
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e801memorysize:
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	.long	0
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	.long	0
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