vga segment define

1 year ago · a7b35d7302
parent 62638cf6f5
commit a7b35d7302
2 changed files with 5 additions and 3 deletions
--- a/boot1.s
+++ b/boot1.s
@ -382,7 +382,7 @@ vga_clear:
  push ax
  push cx

-  mov ax, 0xb800
+  mov ax, VGA_SEG
  mov es, ax
  mov ax, [GLOBALS + VGA_COL]
  mov cx, VGA_WIDTH * VGA_HEIGHT
@ -410,7 +410,7 @@ vga_scroll:
  push es
  push ds

-  mov ax, 0xb800
+  mov ax, VGA_SEG
  mov ds, ax
  mov es, ax

@ -475,7 +475,7 @@ vga_print_raw:
  mov di, cx
  shl di, 1
  
-  mov ax, 0xb800
+  mov ax, VGA_SEG
  mov fs, ax
  mov ah, [GLOBALS + VGA_COL + 1]

--- a/defines.s
+++ b/defines.s
@ -12,6 +12,8 @@

 %define EBDA_START 0x080000

+%define VGA_SEG 0xb800
+
 %define BOOT1_MAGIC 0x544e4150

 %define VGA_WIDTH  80