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Annotation of 43BSDTahoe/sys/vaxif/if_uba.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1982, 1986 Regents of the University of California.
                      3:  * All rights reserved.  The Berkeley software License Agreement
                      4:  * specifies the terms and conditions for redistribution.
                      5:  *
                      6:  *     @(#)if_uba.h    7.2 (Berkeley) 8/9/86
                      7:  */
                      8: 
                      9: /*
                     10:  * Structure and routine definitions
                     11:  * for UNIBUS network interfaces.
                     12:  */
                     13: 
                     14: #define        IF_MAXNUBAMR    10
                     15: /*
                     16:  * Each interface has structures giving information
                     17:  * about UNIBUS resources held by the interface
                     18:  * for each send and receive buffer.
                     19:  *
                     20:  * We hold IF_NUBAMR map registers for datagram data, starting
                     21:  * at ifr_mr.  Map register ifr_mr[-1] maps the local network header
                     22:  * ending on the page boundary.  Bdp's are reserved for read and for
                     23:  * write, given by ifr_bdp.  The prototype of the map register for
                     24:  * read and for write is saved in ifr_proto.
                     25:  *
                     26:  * When write transfers are not full pages on page boundaries we just
                     27:  * copy the data into the pages mapped on the UNIBUS and start the
                     28:  * transfer.  If a write transfer is of a (1024 byte) page on a page
                     29:  * boundary, we swap in UNIBUS pte's to reference the pages, and then
                     30:  * remap the initial pages (from ifu_wmap) when the transfer completes.
                     31:  *
                     32:  * When read transfers give whole pages of data to be input, we
                     33:  * allocate page frames from a network page list and trade them
                     34:  * with the pages already containing the data, mapping the allocated
                     35:  * pages to replace the input pages for the next UNIBUS data input.
                     36:  */
                     37: 
                     38: /*
                     39:  * Information per interface.
                     40:  */
                     41: struct ifubinfo {
                     42:        short   iff_uban;                       /* uba number */
                     43:        short   iff_hlen;                       /* local net header length */
                     44:        struct  uba_regs *iff_uba;              /* uba adaptor regs, in vm */
                     45:        struct  pte *iff_ubamr;                 /* uba map regs, in vm */
                     46:        short   iff_flags;                      /* used during uballoc's */
                     47: };
                     48: 
                     49: /*
                     50:  * Information per buffer.
                     51:  */
                     52: struct ifrw {
                     53:        caddr_t ifrw_addr;                      /* virt addr of header */
                     54:        short   ifrw_bdp;                       /* unibus bdp */
                     55:        short   ifrw_flags;                     /* type, etc. */
                     56: #define        IFRW_W  0x01                            /* is a transmit buffer */
                     57:        int     ifrw_info;                      /* value from ubaalloc */
                     58:        int     ifrw_proto;                     /* map register prototype */
                     59:        struct  pte *ifrw_mr;                   /* base of map registers */
                     60: };
                     61: 
                     62: /*
                     63:  * Information per transmit buffer, including the above.
                     64:  */
                     65: struct ifxmt {
                     66:        struct  ifrw ifrw;
                     67:        caddr_t ifw_base;                       /* virt addr of buffer */
                     68:        struct  pte ifw_wmap[IF_MAXNUBAMR];     /* base pages for output */
                     69:        struct  mbuf *ifw_xtofree;              /* pages being dma'd out */
                     70:        short   ifw_xswapd;                     /* mask of clusters swapped */
                     71:        short   ifw_nmr;                        /* number of entries in wmap */
                     72: };
                     73: #define        ifw_addr        ifrw.ifrw_addr
                     74: #define        ifw_bdp         ifrw.ifrw_bdp
                     75: #define        ifw_flags       ifrw.ifrw_flags
                     76: #define        ifw_info        ifrw.ifrw_info
                     77: #define        ifw_proto       ifrw.ifrw_proto
                     78: #define        ifw_mr          ifrw.ifrw_mr
                     79: 
                     80: /*
                     81:  * Most interfaces have a single receive and a single transmit buffer,
                     82:  * and use struct ifuba to store all of the unibus information.
                     83:  */
                     84: struct ifuba {
                     85:        struct  ifubinfo ifu_info;
                     86:        struct  ifrw ifu_r;
                     87:        struct  ifxmt ifu_xmt;
                     88: };
                     89: 
                     90: #define        ifu_uban        ifu_info.iff_uban
                     91: #define        ifu_hlen        ifu_info.iff_hlen
                     92: #define        ifu_uba         ifu_info.iff_uba
                     93: #define        ifu_ubamr       ifu_info.iff_ubamr
                     94: #define        ifu_flags       ifu_info.iff_flags
                     95: #define        ifu_w           ifu_xmt.ifrw
                     96: #define        ifu_xtofree     ifu_xmt.ifw_xtofree
                     97: 
                     98: #ifdef         KERNEL
                     99: #define        if_ubainit(ifuba, uban, hlen, nmr) \
                    100:                if_ubaminit(&(ifuba)->ifu_info, uban, hlen, nmr, \
                    101:                        &(ifuba)->ifu_r, 1, &(ifuba)->ifu_xmt, 1)
                    102: #define        if_rubaget(ifu, totlen, off0, ifp) \
                    103:                if_ubaget(&(ifu)->ifu_info, &(ifu)->ifu_r, totlen, off0, ifp)
                    104: #define        if_wubaput(ifu, m) \
                    105:                if_ubaput(&(ifu)->ifu_info, &(ifu)->ifu_xmt, m)
                    106: struct mbuf *if_ubaget();
                    107: #endif

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