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Rev 110 Rev 139
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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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#include <arch/boot/memmap.h>
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#include <arch/boot/memmapasm.h>
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E820_RECORD_SIZE = MEMMAP_E820_RECORD_SIZE
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E820_RECORD_SIZE = MEMMAP_E820_RECORD_SIZE
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E820_MAX_RECORDS = MEMMAP_E820_MAX_RECORDS
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E820_MAX_RECORDS = MEMMAP_E820_MAX_RECORDS
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E820_SMAP = 0x534d4150
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E820_SMAP = 0x534d4150
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.global memmap_arch_init
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.global memmap_arch_init
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.global e820counter
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.global e820table
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.global e801memorysize
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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,%di
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	movw	$e820table,%di
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	movb	$E820_MAX_RECORDS,(e820counter)
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	movb	$E820_MAX_RECORDS,(e820counter)
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e820loop:
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e820loop:
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	movl	$E820_SMAP,%edx 	# constrol sequence "SMAP"
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	movl	$E820_SMAP,%edx 	# control 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	$0x0000e820,%eax	# service
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	movl	$E820_RECORD_SIZE,%ecx
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	movl	$E820_RECORD_SIZE,%ecx
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	int 	$0x15
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	int 	$0x15
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	jc		e820end
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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		e820end
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	jne	e820err
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	cmpl	$E820_RECORD_SIZE,%ecx
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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	$E820_RECORD_SIZE,%ax
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	addw	$E820_RECORD_SIZE,%ax
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	movw	%ax,%di
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	movw	%ax,%di
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	cmpl	$0,%ebx
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	cmpl	$0,%ebx
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	jne	e820loop
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	jne	e820loop
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e820end:
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e820end:
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	movb	(e820counter),%al
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	movb	$E820_MAX_RECORDS,%al
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	negb	%al
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	addb	$32,%al
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	subb	(e820counter),%al
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	movb	%al,(e820counter) # store # of valid entries in e820counter
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	movb	%al,(e820counter) # store # of valid entries in e820counter
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	jmp	e801begin
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e820err:
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	movb	$0,(e820counter)
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# method e801 - get size of memory
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e801begin:
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	xorw	%dx,%dx
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	xorw	%cx,%cx
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	xorw	%bx,%bx
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	movw	$0xe801,%ax
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	stc
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	int	$0x15
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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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	testw	%cx,%cx
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	jnz	e801cxdx
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	testw	%dx,%dx
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	jnz	e801cxdx
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	movw	%ax,%cx
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	movw	%bx,%dx
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e801cxdx:
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	andl	$0xffff,%edx
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	shll	$6,%edx
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	andl	$0xffff,%ecx
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	addl	%ecx,%edx
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	addl	$0x0400,%edx  # add lower 1 MB - its not count by e801 method
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	movl	%edx,(e801memorysize)
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e801end:
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	ret
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	ret
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	#memory size in 1 kb chunks
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e801memorysize:
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	.long	0
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e820counter:
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e820counter:
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	.byte 0
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	.byte 0xff
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e820table:
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e820table:
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	.space  (32*E820_RECORD_SIZE),0 # space for 32 records, each E820_RECORD_SIZE bytes long
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	.space  (32*E820_RECORD_SIZE),0xff # space for 32 records, each E820_RECORD_SIZE bytes long