Pong

I forgot to commit for a while and I haven't done much, but got the very basics of the game pong working.

Signed-off-by: deadvey <deadvey@deadvey.com>

source/features/graphics.asm

@@ -16,8 +16,6 @@ os_set_graphics_mode:
 ; y_start
 ; colour
 os_draw_graphical_rectangle:
-	pusha
-
 	; Tell BIOS we're changing 'da pixels!
 	mov ah, 0Ch
 
@@ -28,21 +26,28 @@ os_draw_graphical_rectangle:
 
 	jmp .x_loop
 
-	.x_loop:
-		int 10h
-		cmp cx, [x_end]
-		je .next_row
-		inc cx
-		call .x_loop
+.x_loop:
+   int 10h
+   cmp cx, [x_end]
+   je .next_row
+   inc cx
+   call .x_loop
 
-	.next_row:
-		mov cx, [x_start]
-		cmp dx, [y_end]
-		je .finish
-		inc dx					; Increase Row
-		call .x_loop
+.next_row:
+   mov cx, [x_start]
+   cmp dx, [y_end]
+   je .finish
+   inc dx					; Increase Row
+   call .x_loop
 
-	.finish:
-		popa
-		Iret
+.finish:
+   ret
+
+
+section .data
+	x_start dw 0
+	y_start dw 0
+	x_end dw 0
+	y_end dw 0
+	colour db 1111b