sys/vaxif/if_uba.h

/*
 * Copyright (c) 1982, 1986 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 *      @(#)if_uba.h    7.3 (Berkeley) 8/4/88
 */

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

#define IF_MAXNUBAMR    10
/*
 * Each interface has structures giving information
 * about UNIBUS resources held by the interface
 * for each send and receive buffer.
 *
 * 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.
 */

/*
 * Information per interface.
 */
struct  ifubinfo {
        short   iff_uban;                       /* uba number */
        short   iff_hlen;                       /* local net header length */
        struct  uba_regs *iff_uba;              /* uba adaptor regs, in vm */
        struct  pte *iff_ubamr;                 /* uba map regs, in vm */
        short   iff_flags;                      /* used during uballoc's */
};

/*
 * Information per buffer.
 */
struct ifrw {
        caddr_t ifrw_addr;                      /* virt addr of header */
        short   ifrw_bdp;                       /* unibus bdp */
        short   ifrw_flags;                     /* type, etc. */
#define IFRW_W  0x01                            /* is a transmit buffer */
        int     ifrw_info;                      /* value from ubaalloc */
        int     ifrw_proto;                     /* map register prototype */
        struct  pte *ifrw_mr;                   /* base of map registers */
};

/*
 * Information per transmit buffer, including the above.
 */
struct ifxmt {
        struct  ifrw ifrw;
        caddr_t ifw_base;                       /* virt addr of buffer */
        struct  pte ifw_wmap[IF_MAXNUBAMR];     /* base pages for output */
        struct  mbuf *ifw_xtofree;              /* pages being dma'd out */
        short   ifw_xswapd;                     /* mask of clusters swapped */
        short   ifw_nmr;                        /* number of entries in wmap */
};
#define ifw_addr        ifrw.ifrw_addr
#define ifw_bdp         ifrw.ifrw_bdp
#define ifw_flags       ifrw.ifrw_flags
#define ifw_info        ifrw.ifrw_info
#define ifw_proto       ifrw.ifrw_proto
#define ifw_mr          ifrw.ifrw_mr

/*
 * Most interfaces have a single receive and a single transmit buffer,
 * and use struct ifuba to store all of the unibus information.
 */
struct ifuba {
        struct  ifubinfo ifu_info;
        struct  ifrw ifu_r;
        struct  ifxmt ifu_xmt;
};

#define ifu_uban        ifu_info.iff_uban
#define ifu_hlen        ifu_info.iff_hlen
#define ifu_uba         ifu_info.iff_uba
#define ifu_ubamr       ifu_info.iff_ubamr
#define ifu_flags       ifu_info.iff_flags
#define ifu_w           ifu_xmt.ifrw
#define ifu_xtofree     ifu_xmt.ifw_xtofree

#ifdef  KERNEL
#define if_ubainit(ifuba, uban, hlen, nmr) \
                if_ubaminit(&(ifuba)->ifu_info, uban, hlen, nmr, \
                        &(ifuba)->ifu_r, 1, &(ifuba)->ifu_xmt, 1)
#define if_rubaget(ifu, totlen, off0, ifp) \
                if_ubaget(&(ifu)->ifu_info, &(ifu)->ifu_r, totlen, off0, ifp)
#define if_wubaput(ifu, m) \
                if_ubaput(&(ifu)->ifu_info, &(ifu)->ifu_xmt, m)
struct  mbuf *if_ubaget();
#endif