if_uba.h

<B>Digital的Unix操作系统VAX 4.2源码</B>

/* 
 * @(#)if_uba.h	4.1 	Ultrix 7/2/90
 */

/************************************************************************
 *									*
 *			Copyright (c) 1985 by				*
 *		Digital Equipment Corporation, Maynard, MA		*
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 *   This software is furnished under a license and may be used and	*
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 *   with the  inclusion  of  the  above  copyright  notice.   This	*
 *   software  or  any  other copies thereof may not be provided or	*
 *   otherwise made available to any other person.  No title to and	*
 *   ownership of the software is hereby transferred.			*
 *									*
 *   This software is  derived  from  software  received  from  the	*
 *   University    of   California,   Berkeley,   and   from   Bell	*
 *   Laboratories.  Use, duplication, or disclosure is  subject  to	*
 *   restrictions  under  license  agreements  with  University  of	*
 *   California and with AT&T.						*
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 *   The information in this software is subject to change  without	*
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 *   Equipment Corporation.						*
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 *   Digital assumes no responsibility for the use  or  reliability	*
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 ************************************************************************/

/* ------------------------------------------------------------------------
 * Modification History: /sys/vaxif/if_uba.h
 *
 * 11-jul-85 -- jaw
 *	fix bua/bda map registers.
 *
 * 19-Jun-85 -- jaw
 *	VAX8200 name change.
 * 
 * 13 Mar 85 -- Jaw
 * 	add support for VAX8200 and bua.	
 *
 * -----------------------------------------------------------------------
 */

/*
 * Structure and routine definitions
 * for UNIBUS network interfaces.
 */

#define	IF_MAXNUBAMR	10
/*
 * Each interface has one of these structures giving information
 * about UNIBUS resources held by the interface.
 *
 * We hold IF_NUBAMR map registers for datagram data, starting
 * at ifr_mr.  Map register ifr_mr[-1] maps the local network header
 * ending on the page boundary.  Bdp's are reserved for read and for
 * write, given by ifr_bdp.  The prototype of the map register for
 * read and for write is saved in ifr_proto.
 *
 * When write transfers are not full pages on page boundaries we just
 * copy the data into the pages mapped on the UNIBUS and start the
 * transfer.  If a write transfer is of a (1024 byte) page on a page
 * boundary, we swap in UNIBUS pte's to reference the pages, and then
 * remap the initial pages (from ifu_wmap) when the transfer completes.
 *
 * When read transfers give whole pages of data to be input, we
 * allocate page frames from a network page list and trade them
 * with the pages already containing the data, mapping the allocated
 * pages to replace the input pages for the next UNIBUS data input.
 */
struct	ifuba {
	short	ifu_uban;			/* uba number */
	short	ifu_hlen;			/* local net header length */
	struct	uba_regs *ifu_uba;		/* uba regs, in vm */
	struct ifrw {
		caddr_t	ifrw_addr;		/* virt addr of header */
		int	ifrw_bdp;		/* unibus bdp */
		int	ifrw_info;		/* value from ubaalloc */
		int	ifrw_proto;		/* map register prototype */
		struct	pte *ifrw_mr;		/* base of map registers */
	} ifu_r, ifu_w;
	struct	pte ifu_wmap[IF_MAXNUBAMR];	/* base pages for output */
	short	ifu_xswapd;			/* mask of clusters swapped */
	short	ifu_flags;			/* used during uballoc's */
	struct	mbuf *ifu_xtofree;		/* pages being dma'd out */
};

#ifdef 	KERNEL
struct	mbuf *if_rubaget();
#endif