2.9BSD - /usr/src/sys/stand/libsa/rm.c

   1: /*
   2:  * RM02/3 disk driver
   3:  */
   4: 
   5: #include <sys/param.h>
   6: #include <sys/inode.h>
   7: #include "../saio.h"
   8: 
   9: struct  device
  10: {
  11:     union {
  12:         int     w;
  13:         char    c[2];
  14:     } rmcs1;        /* Control and Status register 1 */
  15:     int     rmwc;      /* Word count register */
  16:     caddr_t rmba;      /* UNIBUS address register */
  17:     int     rmda;      /* Desired address register */
  18:     union {
  19:         int     w;
  20:         char    c[2];
  21:     } rmcs2;        /* Control and Status register 2*/
  22:     int     rmds;      /* Drive Status */
  23:     int     rmer1;    /* Error register 1 */
  24:     int     rmas;      /* Attention Summary */
  25:     int     rmla;      /* Look ahead */
  26:     int     rmdb;      /* Data buffer */
  27:     int     rmmr1;    /* Maintenance register 1 */
  28:     int     rmdt;      /* Drive type */
  29:     int     rmsn;      /* Serial number */
  30:     int     rmof;      /* Offset register */
  31:     int     rmdc;      /* Desired Cylinder register*/
  32:     int     rmhr;      /* Holding register - unused*/
  33:     int     rmmr2;    /* Maintenence register 2 */
  34:     int     rmer2;    /* Error register 2 */
  35:     int     rmec1;    /* Burst error bit position */
  36:     int     rmec2;    /* Burst error bit pattern */
  37:     int     rmbae;    /* 11/70 bus extension */
  38:     int     rmcs3;
  39: };
  40: 
  41: #define RMADDR  ((struct device *)0176700)
  42: #define NSECT   32
  43: #define NTRAC   5
  44: #define SDIST   2
  45: #define RDIST   6
  46: 
  47: #define P400    020
  48: #define M400    0220
  49: #define P800    040
  50: #define M800    0240
  51: #define P1200   060
  52: #define M1200   0260
  53: 
  54: #define GO      01
  55: #define PRESET  020
  56: #define RTC     016
  57: #define OFFSET  014
  58: #define SEARCH  030
  59: #define RECAL   06
  60: #define DCLR    010
  61: #define WCOM    060
  62: #define RCOM    070
  63: 
  64: #define IE      0100
  65: #define PIP     020000
  66: #define DRY     0200
  67: #define ERR     040000
  68: #define TRE     040000
  69: #define DCK     0100000
  70: #define WLE     04000
  71: #define ECH     0100
  72: #define VV      0100
  73: #define FMT16   010000
  74: 
  75: rmstrategy(io, func)
  76: register struct iob *io;
  77: {
  78:     register unit;
  79:     register i;
  80:     daddr_t bn;
  81:     int sn, cn, tn;
  82: 
  83:     if (((unit = io->i_unit) & 04) == 0)
  84:         bn = io->i_bn;
  85:     else {
  86:         unit &= 03;
  87:         bn = io->i_bn;
  88:         bn -= io->i_boff;
  89:         i = unit + 1;
  90:         unit = bn%i;
  91:         bn /= i;
  92:         bn += io->i_boff;
  93:     }
  94: 
  95:     RMADDR->rmcs2.w = unit;
  96: 
  97:     if((RMADDR->rmds & VV) == 0) {
  98:         RMADDR->rmcs1.c[0] = PRESET|GO;
  99:         RMADDR->rmof = FMT16;
 100:     }
 101:     cn = bn/(NSECT*NTRAC);
 102:     sn = bn%(NSECT*NTRAC);
 103:     tn = sn/NSECT;
 104:     sn = sn%NSECT;
 105: 
 106:     RMADDR->rmdc = cn;
 107:     RMADDR->rmda = (tn << 8) + sn;
 108:     RMADDR->rmba = io->i_ma;
 109:     RMADDR->rmwc = -(io->i_cc>>1);
 110:     unit = (segflag << 8) | GO;
 111:     if (func == READ)
 112:         unit |= RCOM;
 113:     else if (func == WRITE)
 114:         unit |= WCOM;
 115:     RMADDR->rmcs1.w = unit;
 116:     while ((RMADDR->rmcs1.w&DRY) == 0)
 117:             ;
 118:     if (RMADDR->rmcs1.w & TRE) {
 119:         printf("disk error: cyl=%d track=%d sect=%d cs2=%o, er1=%o\n",
 120:             cn, tn, sn, RMADDR->rmcs2, RMADDR->rmer1);
 121:         return(-1);
 122:     }
 123:     return(io->i_cc);
 124: }

Defined functions

Defined struct's

Defined macros