majver		equ	10		;version number of the infrastructure.

MAX_ADDR_LEN	equ	16		;maximum number of bytes in our address.

MAX_HANDLE	equ	10		;maximum number of handles.

MAX_P_LEN	equ	8		;maximum type length

MAX_MULTICAST	equ	8		;maximum number of multicast addresses.

;  Copyright, 1988-1992, Russell Nelson, Crynwr Software

;   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, version 1.
;
;   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.

HT	equ	09h
CR	equ	0dh
LF	equ	0ah

;
;  Packet Driver Error numbers
NO_ERROR	equ	0		;no error at all.
BAD_HANDLE	equ	1		;invalid handle number
NO_CLASS	equ	2		;no interfaces of specified class found
NO_TYPE		equ	3		;no interfaces of specified type found
NO_NUMBER	equ	4		;no interfaces of specified number found
BAD_TYPE	equ	5		;bad packet type specified
NO_MULTICAST	equ	6		;this interface does not support
					;multicast
CANT_TERMINATE	equ	7		;this packet driver cannot terminate
BAD_MODE	equ	8		;an invalid receiver mode was specified
NO_SPACE	equ	9		;operation failed because of
					;insufficient space
TYPE_INUSE	equ	10		;the type had previously been accessed,
					;and not released.
BAD_COMMAND	equ	11		;the command was out of range, or not
					;implemented
CANT_SEND	equ	12		;the packet couldn't be sent (usually
					;hardware error)
CANT_SET	equ	13		;hardware address couldn't be changed
					;(more than 1 handle open)
BAD_ADDRESS	equ	14		;hardware address has bad length or
					;format
CANT_RESET	equ	15		;Couldn't reset interface (more than
					;1 handle open).
BAD_IOCB	equ	16		;an invalid iocb was specified

;a few useful Ethernet definitions.
RUNT		equ	60		;smallest legal size packet, no fcs
GIANT		equ	1514		;largest legal size packet, no fcs
EADDR_LEN	equ	6		;Ethernet address length.
ARCADDR_LEN	equ	1

BLUEBOOK	equ	1
IEEE8023	equ	11

;The following two macros are used to manipulate port addresses.
;Use loadport to initialize dx.  Use setport to set a specific port on
;the board.  setport remembers what the current port number is, but beware!
;setport assumes that code is being executed in the same order as the
;code is presented in the source file.  Whenever this assumption is violated,
;you need to enter another loadport.  Some, but not all examples are:
;in a loop with multiple setports, or a backward jump over a setport, or
;a forward jump over a setport.  If you have any doubt, consult the
;individual driver sources for examples of usage.  If you suspect that
;you have too few loadports, define the symbol "no_confidence" to a
;one.  This will force a loadport before every setport.  If you wish to turn
;it off for some of your code, redefine it to a zero.

loadport	macro
	mov	dx,io_addr
port_no	=	0
	endm

;change the port number from the current value to the new value.
setport	macro	new_port_no
	ifdef	no_confidence		;define if you suspect that you don't
	  if	no_confidence
		loadport		;  have enough loadports, i.e. dx is
	  endif
	endif				;  set to the wrong port.
	if	new_port_no - port_no EQ 1
		inc	dx
	else
		if	new_port_no - port_no EQ -1
			dec	dx
		else
			if	new_port_no - port_no NE 0
				add	dx,new_port_no - port_no
			endif
		endif
	endif
port_no	=	new_port_no
	endm

;this macro writes the given character to the given row and column on
;  an CGA.
to_scrn	macro	r, c, ch
	push	bx
	push	es
	mov	bx,0b800h
	mov	es,bx
	mov	bx,es:[r*160+c*2]
	inc	bh
	and	bh,07h
	mov	bl,ch
	mov	es:[r*160+c*2],bx
	pop	es
	pop	bx
	endm



segmoffs	struc			; defines offs as 0, segm as 2
offs		dw	?
segm		dw	?
segmoffs	ends

CY	equ	0001h
EI	equ	0200h

iocb		struc			; as_send_pkt structure
buffer		dd	?		; Pointer to the buffer
len		dw	?		; Its length
flags		db	?		; Some flags
ret_code	db	?		; Completion code
upcall		dd	?		; I/O completion upcall
next		dd	?		; Private next pointer (queue)
resv		db	4 dup (?)	; Unused private data
iocb		ends

DONE	equ	1		; I/O complete flag
CALLME	equ	2		; Please upcall me flag


send_queueempty	macro
; Check if send queue is empty.
; Enter with interrupts disabled.
; Exit with zr (zero) if empty, nz (not zero) if not.
; Destroys ax.
	mov ax,	word ptr send_head	; Queue empty?
	or ax,	word ptr send_head+2
	endm

send_peekqueue	macro
; Peek into the queue and get the next entry.
; Enter with interrupts disabled.
; Exit with es:di -> iocb.
	les di, send_head	; Get head segment:offset
	endm

; Bits in sys_features
MICROCHANNEL	equ	02		; a micro channel computer
TWO_8259	equ	40h		; 2nd 8259 exists

; Bits in flagbyte
CALLED_ETOPEN	equ	1		; have called etopen
D_OPTION	equ	2		; delayed initialization
N_OPTION	equ	4		; Novell protocol conversion
W_OPTION	equ	8		; Windows upcall checking.