vga print helpers

defines.s

@@ -6,6 +6,11 @@
 
 %define EBDA_START 0x080000
 
+%define BOOT1_MAGIC 0x544e4150
+
+%define VGA_WIDTH  80
+%define VGA_HEIGHT 25
+
 ; boot0 base stack frame variable offsets / globals
 ; (we use the same offsets once we copy the variables to the globals section)
 ; -------------------------------------------------------------------------------------------------
@@ -29,3 +34,18 @@
 %define GPT_SECTORS_LOADED     0x16
 %define GPT_CURRENT_LBA        0x18
 %define BOOT1_GPT_ENTRY_ADDR   0x1a
+
+; Globals
+; ------------------------------------------------------------------------------------------------
+%define VGA_COL                0x1c
+%define TEXTBUF_LINE           0x1e
+
+%macro fnstart 0
+  push bp
+  mov bp, sp
+%endmacro
+
+%macro fnret 0
+  pop bp
+  ret
+%endmacro