UNIX 6th Ed. - /usr/sys/dmr/rf.c

   1: #
   2: /*
   3:  */
   4: 
   5: /*
   6:  * RF disk driver
   7:  */
   8: 
   9: #include "../param.h"
  10: #include "../buf.h"
  11: #include "../conf.h"
  12: #include "../user.h"
  13: 
  14: struct {
  15:     int rfcs;
  16:     int rfwc;
  17:     int rfba;
  18:     int rfda;
  19:     int rfdae;
  20: };
  21: 
  22: struct  devtab  rftab;
  23: struct  buf rrfbuf;
  24: 
  25: #define NRFBLK  1024
  26: #define RFADDR  0177460
  27: 
  28: #define GO  01
  29: #define RCOM    02
  30: #define WCOM    04
  31: #define CTLCLR  0400
  32: #define IENABLE 0100
  33: 
  34: rfstrategy(abp)
  35: struct buf *abp;
  36: {
  37:     register struct buf *bp;
  38: 
  39:     bp = abp;
  40:     if(bp->b_flags&B_PHYS)
  41:         mapalloc(bp);
  42:     if (bp->b_blkno >= NRFBLK*(bp->b_dev.d_minor+1)) {
  43:         bp->b_flags =| B_ERROR;
  44:         iodone(bp);
  45:         return;
  46:     }
  47:     bp->av_forw = 0;
  48:     spl5();
  49:     if (rftab.d_actf==0)
  50:         rftab.d_actf = bp;
  51:     else
  52:         rftab.d_actl->av_forw = bp;
  53:     rftab.d_actl = bp;
  54:     if (rftab.d_active==0)
  55:         rfstart();
  56:     spl0();
  57: }
  58: 
  59: rfstart()
  60: {
  61:     register struct buf *bp;
  62: 
  63:     if ((bp = rftab.d_actf) == 0)
  64:         return;
  65:     rftab.d_active++;
  66:     RFADDR->rfdae = bp->b_blkno.hibyte;
  67:     devstart(bp, &RFADDR->rfda, bp->b_blkno<<8, 0);
  68: }
  69: 
  70: rfintr()
  71: {
  72:     register struct buf *bp;
  73: 
  74:     if (rftab.d_active == 0)
  75:         return;
  76:     bp = rftab.d_actf;
  77:     rftab.d_active = 0;
  78:     if (RFADDR->rfcs < 0) {     /* error bit */
  79:         deverror(bp, RFADDR->rfcs, RFADDR->rfdae);
  80:         RFADDR->rfcs = CTLCLR;
  81:         if (++rftab.d_errcnt <= 10) {
  82:             rfstart();
  83:             return;
  84:         }
  85:         bp->b_flags =| B_ERROR;
  86:     }
  87:     rftab.d_errcnt = 0;
  88:     rftab.d_actf = bp->av_forw;
  89:     iodone(bp);
  90:     rfstart();
  91: }
  92: 
  93: rfread(dev)
  94: {
  95: 
  96:     physio(rfstrategy, &rrfbuf, dev, B_READ);
  97: }
  98: 
  99: rfwrite(dev)
 100: {
 101: 
 102:     physio(rfstrategy, &rrfbuf, dev, B_WRITE);
 103: }

Defined functions

Defined variables

Defined macros