source: bootcd/isolinux/syslinux-6.03/core/bios.inc

;; -----------------------------------------------------------------------
;;
;;   Copyright 1994-2008 H. Peter Anvin - All Rights Reserved
;;
;;   This program is free software; you can redistribute it and/or modify
;;   it under the terms of the GNU General Public License as published by
;;   the Free Software Foundation, Inc., 53 Temple Place Ste 330,
;;   Boston MA 02111-1307, USA; either version 2 of the License, or
;;   (at your option) any later version; incorporated herein by reference.
;;
;; -----------------------------------------------------------------------

;;
;; bios.inc
;;
;; Header file for the BIOS data structures etc.
;;

%ifndef _BIOS_INC
%define _BIOS_INC

                ; Interrupt vectors
                absolute 4*1Ch
BIOS_timer_hook resd 1

                absolute 4*1Eh
fdctab          equ $
fdctab1         resw 1
fdctab2         resw 1

                absolute 0400h
serial_base     resw 4                  ; Base addresses for 4 serial ports
                absolute 0413h
BIOS_fbm        resw 1                  ; Free Base Memory (kilobytes)
                absolute 0462h
BIOS_page       resb 1                  ; Current video page
                absolute 046Ch
BIOS_timer      resw 1                  ; Timer ticks
                absolute 0472h
BIOS_magic      resw 1                  ; BIOS reset magic
                absolute 0484h
BIOS_vidrows    resb 1                  ; Number of screen rows

%endif ; _BIOS_INC