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Annotation of xinu/sys/dlcwrite.c, revision 1.1.1.1

1.1       root        1: /* dlcwrite.c - dlcwrite */
                      2: 
                      3: #include <conf.h>
                      4: #include <kernel.h>
                      5: #include <slu11.h>
                      6: #include <proc.h>
                      7: #include <sleep.h>
                      8: #include <dlc.h>
                      9: 
                     10: /*------------------------------------------------------------------------
                     11:  *  dlcwrite  --  write a block (frame) with byte-stuffing and EOB
                     12:  *------------------------------------------------------------------------
                     13:  */
                     14: dlcwrite(devptr, buff, count)
                     15: struct devsw   *devptr;
                     16: char   *buff;
                     17: int    count;
                     18: {
                     19:        char    ps;
                     20:        struct  dlblk   *dptr;
                     21:        struct  csr     *cptr;
                     22: 
                     23:        if (count < 0)
                     24:                return(SYSERR);
                     25:        else if (count == 0)
                     26:                return(OK);
                     27:        disable(ps);
                     28:        dptr = devptr->dvioblk;
                     29:        if (dptr->dostate != DLOINIT) {
                     30:                restore(ps);
                     31:                return(SYSERR);
                     32:        }
                     33:        dptr->dostate = DLOREADY;
                     34:        dptr->dostart = dptr->donext = buff;
                     35:        dptr->dotot = dptr->docount = count;
                     36:        dptr->doesc = FALSE;
                     37:        (dptr->dioaddr)->ctstat = SLUENABLE;
                     38:        dptr->doproc = currpid;
                     39:        suspend(currpid);
                     40:        dptr->dostate = DLOINIT;
                     41:        restore(ps);
                     42:        return(OK);
                     43: }

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