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Annotation of 42BSD/sys/vaxif/if_uba.h, revision 1.1.1.1

1.1       root        1: /*     if_uba.h        6.1     83/07/29        */
                      2: 
                      3: /*
                      4:  * Structure and routine definitions
                      5:  * for UNIBUS network interfaces.
                      6:  */
                      7: 
                      8: #define        IF_MAXNUBAMR    10
                      9: /*
                     10:  * Each interface has one of these structures giving information
                     11:  * about UNIBUS resources held by the interface.
                     12:  *
                     13:  * We hold IF_NUBAMR map registers for datagram data, starting
                     14:  * at ifr_mr.  Map register ifr_mr[-1] maps the local network header
                     15:  * ending on the page boundary.  Bdp's are reserved for read and for
                     16:  * write, given by ifr_bdp.  The prototype of the map register for
                     17:  * read and for write is saved in ifr_proto.
                     18:  *
                     19:  * When write transfers are not full pages on page boundaries we just
                     20:  * copy the data into the pages mapped on the UNIBUS and start the
                     21:  * transfer.  If a write transfer is of a (1024 byte) page on a page
                     22:  * boundary, we swap in UNIBUS pte's to reference the pages, and then
                     23:  * remap the initial pages (from ifu_wmap) when the transfer completes.
                     24:  *
                     25:  * When read transfers give whole pages of data to be input, we
                     26:  * allocate page frames from a network page list and trade them
                     27:  * with the pages already containing the data, mapping the allocated
                     28:  * pages to replace the input pages for the next UNIBUS data input.
                     29:  */
                     30: struct ifuba {
                     31:        short   ifu_uban;                       /* uba number */
                     32:        short   ifu_hlen;                       /* local net header length */
                     33:        struct  uba_regs *ifu_uba;              /* uba regs, in vm */
                     34:        struct ifrw {
                     35:                caddr_t ifrw_addr;              /* virt addr of header */
                     36:                int     ifrw_bdp;               /* unibus bdp */
                     37:                int     ifrw_info;              /* value from ubaalloc */
                     38:                int     ifrw_proto;             /* map register prototype */
                     39:                struct  pte *ifrw_mr;           /* base of map registers */
                     40:        } ifu_r, ifu_w;
                     41:        struct  pte ifu_wmap[IF_MAXNUBAMR];     /* base pages for output */
                     42:        short   ifu_xswapd;                     /* mask of clusters swapped */
                     43:        short   ifu_flags;                      /* used during uballoc's */
                     44:        struct  mbuf *ifu_xtofree;              /* pages being dma'd out */
                     45: };
                     46: 
                     47: #ifdef         KERNEL
                     48: struct mbuf *if_rubaget();
                     49: #endif

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