# bootp.i86  -  BOOTP record include file for target library
#
# Copyright (C) 2002-2003 Gero Kuhlmann   <gero@gkminix.han.de>
#
#  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; either version 2 of the License, or
#  any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software
#  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
# $Id: bootp.i86,v 1.2 2003/01/25 23:29:42 gkminix Exp $
#
#====================================================================
#
# Layout and magic ID of BOOTP/DHCP record. Refer to RFC 951,
# RFC 1048 and RFC 1533 for further information.  The BOOTP/DHCP
# record can be longer than the standard length as the bootrom
# might be able to load a vendor extension file via tftp.
#
BOOTP_MAGIC_RFC	.equ H'63538263		# RFC 1048 vendor ID
BOOTP_MAGIC_LEN	.equ 4			# length of vendor ID

BOOTP_REQUEST	.equ   1		# bootp OP-code
BOOTP_REPLY	.equ   2

BOOTP_OP	.equ   0		# offset to bootp OP-code
BOOTP_HTYPE	.equ   1		# offset to hardware type
BOOTP_HLEN	.equ   2		# offset to length of hardware addr
BOOTP_HOPS	.equ   3		# offset to number of gateway hops
BOOTP_XID	.equ   4		# offset to transfer ID
BOOTP_SECS	.equ   8		# offset to seconds since boot began
BOOTP_CIADDR	.equ  12		# offset to client IP address
BOOTP_YIADDR	.equ  16		# offset to "your" IP address
BOOTP_SIADDR	.equ  20		# offset to server IP address 
BOOTP_GIADDR	.equ  24		# offset to gateway IP address
BOOTP_CHADDR	.equ  28		# offset to hardware address
BOOTP_SNAME	.equ  44		# offset to server name
BOOTP_FILE	.equ 108		# offset to name of boot file
BOOTP_VEND	.equ 236		# offset to vendor information

BOOTP_SIZE	.equ 300		# size of complete bootp record

BOOTP_RFC_NOP	.equ   0		# RFC vendor tag for NO-OP
BOOTP_RFC_MSK	.equ   1		# RFC vendor tag for netmask
BOOTP_RFC_GWY	.equ   3		# RFC vendor tag for gateway
BOOTP_RFC_HNAME	.equ  12		# RFC vendor tag for host name
BOOTP_RFC_ROOT	.equ  17		# RFC vendor tag for root directory
BOOTP_RFC_OVRLD	.equ  52		# RFC vendor tag for option overload
BOOTP_RFC_FILE	.equ  67		# RFC vendor tag for boot image file
BOOTP_RFC_END	.equ 255		# RFC vendor tag for end of record

BOOTP_OVR_FILE	.equ B'00000001
BOOTP_OVR_SNAME	.equ B'00000010

MAX_BOOTP_LEN	.equ 2048		# maximum length of bootp record