.load 0x0000           															## BIOS is mapped to address 0x0000 in memory

@include <data.dss>

## ============================= BIOS Program =============================
.code
	movb [VGA_Registers.VIDEO_MODE], VGA_VideoModes.TEXT_SINGLE_COLOR			## Enable Text_Single_Color graphics mode
	mov FL, 0b0000000000000001													## Zero the FL Register and enable interrupts
	movb [{MemoryAddresses.INT_VEC + (0x20 * 3)}], 0xFF 						## Setting up int 0x20 handler
	mov [{MemoryAddresses.INT_VEC + (0x20 * 3) + 1}], $_int_20_handler			## --
	
	mov R10, 0x00																## Setting up int 0x30 handler by using int 0x20 functionality
	mov R9, $_int_30_handler													##  -Passing the handler's address
	mov R8, 0x30																##  -Passing the interrupt's code to setup
	int 0x20																	##  -Calling int 0x20 with 0x00 as parameter, to set new handler up

	mov R10, 0x03
	mov R9, $_bios_name
	int 0x30
	mov R10, 0x01
	mov R9, 32
	int 0x30
	mov R10, 0x04
	mov R9, [$_bios_version_number_maj]
	int 0x30
	mov R10, 0x01
	mov R9, 46
	int 0x30
	mov R10, 0x04
	mov R9, [$_bios_version_number_min]
	int 0x30
	mov R10, 0x02
	int 0x30

	## MBR Loading 
	and FL, 0b1111111111111110													## Disable interrupts
	mov FL, ACC
	push 0
	call $_load_mbr_data_block
	or FL, 0b0000000000000001													## Enable interrupts
	mov FL, ACC
	## ----

	%low INST_BIOS_NODE_TOGGLE 0x00												## Disable BIOS Mode before leaving the BIOS
	jmp MemoryAddresses.MBR         											## Jump to start of MBR in memory
	hlt                															## Just in case somehow execution reaches this point
## ========================================================================

@include <drivers.dss>
@include <utils.dss>

.fixed 4096, 0x00      ## BIOS Needs to be 4096 Bytes exactly