Final changes and tweaks before submission

stage3/bootasm2.S

@@ -38,52 +38,6 @@ cons_writeline:
     call    cons_write_crlf
     ret    
 
-# Added Write Hex and Int functions to help with debugging
-HexChars:	.ascii "0123456789ABCDEF"
-
-cons_write_hex:
-	movw	$4, %cx
-    movb    $0x0E, %ah
-	
-hexloop:
-    rol     $4, %bx
-    movw    %bx, %si
-    and     $0x000F, %si
-    movb    HexChars(%si), %al
-	int		$0x10
-	loop	hexloop
-	ret
-
-cons_write_int:
-    movw    $IntBuffer + 4, %si
-    movw    %bx, %ax
-
-    cmpw    $0, %ax
-    jge     getdigit
-
-    xor     %ax, %ax    # Added to handle signed numbers, it adds the minus and then neg's the number
-    movb    $0x0E, %ah
-    movb    $0x2D, %al
-	int		$0x10
-
-    movw    %bx, %ax
-    negw    %ax
-	
-getdigit:
-	xor		%dx, %dx
-	movw	$10, %cx
-	idiv	%cx
-	addb	$48, %dl
-	movb	%dl, (%si)
-	dec		%si
-	cmp		$0, %ax
-	jne		getdigit
-	inc		%si
-	call	cons_write
-	ret
-	
-IntBuffer:   .string "     "
-
 # Draw Line function DrawLine(x0 (4), y0 (6), x1 (8), y1 (10), color (12))
 # Define parameter address positions in stack
 #define color   12
@@ -230,9 +184,6 @@ cons_plot_pixel:
     mul     %dx                     # does the (y * 320) part of our math        
     add     %cx, %ax                # Add the value of x to register ax      
     movw    %ax, %si                # Move the value of ax into the si counter
-
-    movw    $0xA000, %bx             # Set the start of the video memory location
-    movw    %bx, %es                 # Move that address into the "extra segment" es register
     movw    pixelcolor(%bp), %bx     # Load the color into a register
     movb    %bl, %es:(%si)           # Load the lower half of the color (since they should only be from 0 to 255)
                                      # and place it at the given byte in the segment
@@ -253,6 +204,9 @@ real_start:
     movw    $boot_message, %si  # Display our boot message
     call    cons_writeline
 
+    movw    $0xA000, %bx             # Set the start of the video memory location
+    movw    %bx, %es                 # Move that address into the "extra segment" es register
+
 draw_start:
     # Set the Video mode to VGA 320 x 200 x 256    
     movb    $0, %ah
@@ -332,6 +286,36 @@ draw_start:
     pushw   $180     # x0
     call    cons_draw_line
 
+    #---------------------------
+
+    pushw   $11      # Color
+    pushw   $160     # y1
+    pushw   $30     # x1
+    pushw   $160      # y0
+    pushw   $20     # x0
+    call    cons_draw_line
+
+    pushw   $11      # Color
+    pushw   $180     # y1
+    pushw   $30      # x1
+    pushw   $160     # y0
+    pushw   $30     # x0
+    call    cons_draw_line
+
+    pushw   $11      # Color
+    pushw   $170     # y1
+    pushw   $30      # x1
+    pushw   $170     # y0
+    pushw   $20      # x0
+    call    cons_draw_line
+
+    pushw   $11       # Color
+    pushw   $180     # y1
+    pushw   $30     # x1
+    pushw   $180      # y0
+    pushw   $20     # x0
+    call    cons_draw_line
+
 endless_loop:                   # Loop forever more
     jmp     endless_loop    
 
@@ -339,7 +323,7 @@ endless_loop:                   # Loop forever more
 boot_message:     
     .string "Boot Loader Stage 2 loaded"             
 
-screen_width:
+screen_width:         # Global variables for the screen height and width
     .word   320
 screen_height:
     .Word   200