Created sysvar variable for os_font

Author: Ian Seyler

src/drivers/lfb/lfb.asm

@@ -17,7 +17,7 @@ lfb_init:
 	push rax
 
 	; Convert font data to pixel data. The default 12x6 font is 72 pixels per glyph. 288 bytes per.
-	mov rdi, 0x1C0000
+	mov rdi, os_font
 	mov rsi, font_data
 	xor ebx, ebx
 next_char:
@@ -369,7 +369,7 @@ load_char:
 	pop rax				; Restore the character to display
 
 	; Copy glyph data to Linear Frame Buffer
-	mov rsi, 0x1C0000		; Font pixel data
+	mov rsi, os_font		; Font pixel data
 	mov ecx, [lfb_glyph_bytes]	; Bytes per glyph
 	mul ecx				; EDX:EAX := EAX * ECX
 	xor edx, edx			; Counter for font height

src/sysvar.asm

@@ -47,7 +47,10 @@ os_rx_desc:		equ 0x00000000001A0000	; 0x1A0000 -> 0x1A7FFF	32K Ethernet receive
 os_tx_desc:		equ 0x00000000001A8000	; 0x1A8000 -> 0x1AFFFF	32K Ethernet transmit descriptors
 os_PacketBuffers:	equ 0x00000000001B0000	; 0x1B0000 -> 0x1BFFFF	64K Ethernet packet buffers
 
-						; 0x1C0000 -> 0x1EFFFF	192K Free
+; LFB font data
+os_font:		equ 0x00000000001C0000	; 0x1C0000 -> 0x1CFFFF	64K Font video data
+
+						; 0x1D0000 -> 0x1DFFFF	64K Free
 
 ; Misc memory
 os_SMP:			equ 0x00000000001FF800	; SMP table. Each item is 8 bytes. (2KiB before the 2MiB mark, Room for 256 entries)