2.11BSD#431 - /usr/src/sys/pdpstand/si.c

   1: /*
   2:  * Copyright (c) 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:  *	@(#)si.c	2.2 (2.11BSD) 1996/3/8
   7:  *
   8:  *	SI 9500 CDC 9766 Stand Alone disk driver
   9:  */
  10: 
  11: #include "../h/param.h"
  12: #include "../pdpuba/sireg.h"
  13: #include "saio.h"
  14: 
  15: #define NSI 2
  16: 
  17:     struct  sidevice *SIcsr[NSI + 1] =
  18:         {
  19:         (struct sidevice *)0176700,
  20:         (struct sidevice *)0,
  21:         (struct sidevice *)-1
  22:         };
  23: 
  24: /* defines for 9766 */
  25: #define NHEADS  19
  26: #define NSECT   32
  27: 
  28: #define NSPC    NSECT*NHEADS
  29: static u_char dualsi[NSI];
  30: 
  31: sistrategy(io, func)
  32:     register struct iob *io;
  33: {
  34:     int unit = io->i_unit;
  35:     register int ctlr = io->i_ctlr;
  36:     register struct sidevice *siaddr = SIcsr[ctlr];
  37:     int ii;
  38:     daddr_t bn;
  39:     int sn, cn, tn, bae, lo16;
  40: 
  41:     /*
  42: 	 * weirdness with bit 2 (04) removed - see xp.c for comments
  43: 	 * about this
  44: 	*/
  45:     bn = io->i_bn;
  46:     cn = bn / (NSPC);
  47:     sn = bn % (NSPC);
  48:     tn = sn / (NSECT);
  49:     sn = sn % (NSECT);
  50: 
  51:     if (!dualsi[ctlr]) {
  52:         if (siaddr->siscr != 0)
  53:             dualsi[ctlr]++;
  54:         else
  55:             if ((siaddr->sierr & (SIERR_ERR | SIERR_CNT)) == (SIERR_ERR | SIERR_CNT))
  56:                 dualsi[ctlr]++;
  57:     }
  58:     if (dualsi[ctlr])
  59:         while (!(siaddr->siscr & 0200)) {
  60:             siaddr->sicnr = SI_RESET;
  61:             siaddr->siscr = 1;
  62:         }
  63:     iomapadr(io->i_ma, &bae, &lo16);
  64:     siaddr->sipcr = cn + (unit <<10);
  65:     siaddr->sihsr = (tn << 5) + sn;
  66:     siaddr->simar = (caddr_t)lo16;
  67:     siaddr->siwcr = io->i_cc >> 1;
  68:     ii = (bae << 4) | SI_GO;
  69:     if (func == READ)
  70:         ii |= SI_READ;
  71:     else if (func == WRITE)
  72:         ii |= SI_WRITE;
  73: 
  74:     siaddr->sicnr = ii;
  75: 
  76:     while ((siaddr->sicnr & SI_DONE) == 0)
  77:         continue;
  78: 
  79:     if (siaddr->sierr & SIERR_ERR) {
  80:         printf("%s err cy=%d hd=%d sc=%d cnr=%o, err=%o\n",
  81:             devname(io), cn, tn, sn, siaddr->sicnr, siaddr->sierr);
  82:         return(-1);
  83:     }
  84:     return(io->i_cc);
  85: }
  86: 
  87: siopen(io)
  88:     struct iob *io;
  89: {
  90:     return(genopen(NSI, io));
  91: }

Defined functions

Defined variables

Defined macros