src/dps8/dps8

/* */
This source file includes following definitions.
disk_show_nunits
disk_set_nunits
disk_show_type
disk_set_type
dsk_show_device_name
dsk_set_device_name
signal_disk_ready
disk_set_ready
unloadDisk
loadDisk
disk_reset
disk_attach
disk_init
diskSeek64
diskSeek512
diskSeekSpecial
diskRead
diskWrite
readStatusRegister
diskRdCtrlReg
read_configuration
read_and_clear_statistics
dsk_iom_cmd
ipc_show_nunits
ipc_set_nunits
ipc_show_device_name
ipc_set_device_name
msp_show_nunits
msp_set_nunits
msp_show_device_name
msp_set_device_name
   1 /*
   2  * vim: filetype=c:tabstop=4:ai:expandtab
   3  * SPDX-License-Identifier: ICU
   4  * SPDX-License-Identifier: Multics
   5  * scspell-id: 22079097-f62e-11ec-b987-80ee73e9b8e7
   6  *
   7  * ---------------------------------------------------------------------------
   8  *
   9  * Copyright (c) 2007-2013 Michael Mondy
  10  * Copyright (c) 2012-2016 Harry Reed
  11  * Copyright (c) 2013-2018 Charles Anthony
  12  * Copyright (c) 2021-2024 The DPS8M Development Team
  13  *
  14  * This software is made available under the terms of the ICU License.
  15  * See the LICENSE.md file at the top-level directory of this distribution.
  16  *
  17  * ---------------------------------------------------------------------------
  18  *
  19  * This source file may contain code comments that adapt, include, and/or
  20  * incorporate Multics program code and/or documentation distributed under
  21  * the Multics License.  In the event of any discrepancy between code
  22  * comments herein and the original Multics materials, the original Multics
  23  * materials should be considered authoritative unless otherwise noted.
  24  * For more details and historical background, see the LICENSE.md file at
  25  * the top-level directory of this distribution.
  26  *
  27  * ---------------------------------------------------------------------------
  28  */
  29 
  30 //-V::536
  31 
  32 // source/library_dir_dir/system_library_1/source/bound_volume_rldr_ut_.s.archive/rdisk_.pl1
  33 // source/library_dir_dir/system_library_1/source/bound_rcp_.s.archive/rcp_disk_.pl1
  34 
  35 #include <stdio.h>
  36 
  37 #include "dps8.h"
  38 #include "dps8_iom.h"
  39 #include "dps8_disk.h"
  40 #include "dps8_sys.h"
  41 #include "dps8_cable.h"
  42 #include "dps8_cpu.h"
  43 #include "dps8_faults.h"
  44 #include "dps8_scu.h"
  45 #include "sim_disk.h"
  46 #include "dps8_utils.h"
  47 
  48 #if defined(LOCKLESS)
  49 # include "threadz.h"
  50 #endif /* if defined(LOCKLESS) */
  51 
  52 #define DBG_CTR 1
  53 
  54 //
  55 // A possible disk data packing algorithm
  56 //
  57 // Currently sectors are 512 * word36. Word36 is 64bits; that 56% utilization,
  58 // A computationally efficient packing would improve disk throughput and storage
  59 // efficiency
  60 //
  61 //     word36 in[512]
  62 //     struct dsksec
  63 //       {
  64 //         uint32 low32[512];
  65 //         uint8 high4[512];
  66 //       } out;
  67 //     uint32 * map = (uint32 *) in;
  68 //     uint8 * highmap = (uint8 *) in;
  69 //
  70 //     for (uint i = 0; i < 512; i ++)
  71 //       {
  72 //         out . low32[i] = map[i * 2];
  73 //         out . high4[i] = (uint8) (map[i * 2 + 1]);
  74 //       }
  75 //
  76 // This 36/40 -- 90% utilization; at the cost of the scatter/gather and
  77 // the cost of emulated disk sectors size not a multiple of host disk
  78 // sector size.
  79 //
  80 
  81 // dau_type stat_mpc_.pl1
  82 //
  83 //  dcl  ddev_model (0:223) char (6) static options (constant)
  84 //          init ((84) (""), "  190A", (52) (""), "  190B", "   401", "  190B", (14) (""), "   451", (31) (""), "   402",
  85 //          (13) (""), "   500", "   501", "   500", "   501", "   500", "   501", "   500", "   501", (9) (""), "   509",
  86 //          "", "   509", "", "   509", "", "   509");
  87 
  88 //  84   0:83   ""
  89 //   1  84      "190A"
  90 //  52  85:135  ""
  91 //   1  137     "190B
  92 //   1  138     "401"
  93 //   1  139     "190B"
  94 //  14  140:153 ""
  95 //   1  154     "451"
  96 //  31  155:185 ""
  97 //   1  186     "402"
  98 //  13  175:199 ""
  99 //   1  200     "500"
 100 //   1  201     "501"
 101 //   1  202     "500"
 102 //   1  203     "501"
 103 //   1  204     "500"
 104 //   1  205     "501"
 105 //   1  206     "500"
 106 //   1  207     "501"
 107 //   9  208:216 ""
 108 //   1  217     "509"
 109 //   1  218     ""
 110 //   1  219     "509"
 111 //   1  220     ""
 112 //   1  221     "509"
 113 //   1  222     ""
 114 //   1  223     "509"
 115 
 116 // fs_dev.sect_per_dev:
 117 //           vfd       36/4000000          Bulk
 118 //           vfd       36/814*40*19        MSU0500
 119 //           vfd       36/814*40*19        MSU0450
 120 //           vfd       36/410*40*19        MSU0400
 121 //           vfd       36/410*31*19        DSU190
 122 //           vfd       36/202*18*20        DSU181
 123 //           vfd       36/840*64*20        MSU0501
 124 //           vfd       36/885*255          FIPS 3380
 125 //           vfd       36/1770*255         FIPS 3381
 126 
 127 /* table of # last sector number for each device */
 128 //dcl  last_sect_num (9) fixed bin (24) static options (constant) init
 129 //     (0, 618639, 616359, 309319, 239722, 71999, 1075199, 225674, 451349);
 130 /* table of # of last sector on device (includes T&D cylinders) */
 131 //dcl  last_physical_sect_num (9) fixed bin (24) static options (constant) init
 132 //     (0, 639919, 619399, 312359, 242249, 72359, 1077759, 225674, 451859);
 133 
 134 //          last     t&d last
 135 // D500     618639    639919
 136 // D451     616359    619399
 137 // D400     309319    312359
 138 // D190     239722    242249
 139 // D181      71999     72359
 140 // D501    1075199   1077759
 141 // 3380     225674    225674
 142 // 3381     451349    451859
 143 
 144 struct diskType_t diskTypes[] = {
 145   { "3381",  451350,  0, false, seek_512, 512,   0 }, // disk_init assumes 3381 is at index 0
 146   { "d500",  618640,  1, false, seek_64,   64, 200 },
 147   { "d451",  616360,  1, true,  seek_64,   64, 154 },
 148   { "d400",  309320,  1, true,  seek_64,   64,  84 }, // d400 is a d190 with "high-efficiency format (40 sectors/track)"
 149   { "d190",  239723,  1, true,  seek_64,   64,  84 }, // 190A 84, 190B 137
 150   { "d181",   72000,  1, true,  seek_64,   64,   0 }, // no idea what the dau idx is
 151   { "d501", 1075200,  1, false, seek_64,   64, 201 },
 152   { "3380",  225675,  0, false, seek_512, 512,   0 }, // 338x is never attached to a dau
 153 };
 154 #define N_DISK_TYPES (sizeof (diskTypes) / sizeof (struct diskType_t))
 155 
 156 static uint tAndDCapac[N_DISK_TYPES] = { 451860, 639920, 619400, 312360, 242250, 72360, 1077760, 225675 };
 157 
 158 #define M3381_SECTORS (1770*255)
 159 //#define M3381_SECTORS 6895616
 160 // records per subdev: 74930 (127 * 590)
 161 // number of sub-volumes: 3
 162 // records per dev: 3 * 74930 = 224790
 163 // cyl/sv: 590
 164 // cyl: 1770 (3*590)
 165 // rec/cyl 127
 166 // tracks/cyl 15
 167 // sector size: 512
 168 // sectors: 451858
 169 // data: 3367 MB, 3447808 KB, 6895616 sectors,
 170 //  3530555392 bytes, 98070983 records?
 171 
 172 #define N_DISK_UNITS 2 // default
 173 
 174 struct dsk_state dsk_states [N_DSK_UNITS_MAX];
 175 
 176 //-- // extern t_stat disk_svc(UNIT *up);
 177 
 178 // ./library_dir_dir/include/fs_dev_types.incl.alm
 179 //
 180 // From IBM GA27-1661-3_IBM_3880_Storage_Control_Description_May80, pg 4.4:
 181 //
 182 //  The Seek command transfers the six-byte seek address from the channel to
 183 //  the storage director....
 184 //
 185 //     Bytes 0-5: 0 0 C C 0 H
 186 //
 187 //       Model       Cmax   Hmax
 188 //       3330-1       410     18
 189 //       3330-11      814     18
 190 //       3340 (35MB)  348     11
 191 //       3340 (70MB)  697     11
 192 //       3344         697     11
 193 //       3350         559     29
 194 //
 195 //  Search Identifier Equal [CC HH R]
 196 //
 197 
 198 // ./library_dir_dir/system_library_1/source/bound_page_control.s.archive/disk_control.pl1
 199 //
 200 // dcl     devadd             fixed bin (18);              /* record number part of device address */
 201 //
 202 //  /* Compute physical sector address from input info.  Physical sector result
 203 //   accounts for unused sectors per cylinder. */
 204 //
 205 //        if pvte.is_sv then do;                  /* convert the subvolume devadd to the real devadd */
 206 //             record_offset = mod (devadd, pvte.records_per_cyl);
 207 //             devadd = ((devadd - record_offset) * pvte.num_of_svs) + pvte.record_factor + record_offset;
 208 //        end;
 209 //        sector = devadd * sect_per_rec (pvte.device_type);/* raw sector. */
 210 //        cylinder = divide (sector, pvtdi.usable_sect_per_cyl, 12, 0);
 211 //        sector = sector + cylinder * pvtdi.unused_sect_per_cyl;
 212 //        sector = sector + sect_off;                     /* sector offset, if any. */
 213 //
 214 
 215 // DB37rs DSS190 Disk Subsystem, pg. 27:
 216 //
 217 //   Seek instruction:
 218 //     Sector count limit, bits 0-11: These bits define the binary sector count.
 219 //     All zeros is a maximum count of 4096.
 220 //   Track indicator, bits 12-13:
 221 //     These bits indicate a complete track as good, defective, or alternate.
 222 //       00 = primary track - good
 223 //       01 = alternate track - good
 224 //       10 = defective track - alternate track assigned
 225 //       11 = defective track - no alternate track assigned
 226 //
 227 //   Sector address, bits 16-35
 228 //
 229 //      0                                                  35
 230 //      XXXX  XXXX | XXXX XXXX | XXXX XXXX | XXXX XXXX | XXXX 0000
 231 //        BYTE 0         1           2           3           4
 232 //
 233 //  Seek        011100
 234 //  Read        010101
 235 //  Read ASCII  010011
 236 //  Write       011001
 237 //  Write ASCII 011010
 238 //  Write and compare
 239 //              011011
 240 //  Request status
 241 //              000000
 242 //  reset status
 243 //              100000
 244 //  bootload control store
 245 //              001000
 246 //  itr boot    001001
 247 //
 248 
 249 #if defined(POLTS_DISK_TESTING)
 250 static int nCmds = 0;
 251 #endif /* if defined(POLTS_DISK_TESTING) */
 252 
 253 #define UNIT_FLAGS ( UNIT_FIX | UNIT_ATTABLE | UNIT_ROABLE | \
 254                      UNIT_DISABLE | UNIT_IDLE | DKUF_F_STD )
 255 UNIT dsk_unit[N_DSK_UNITS_MAX] = {
 256 #if defined(NO_C_ELLIPSIS)
 257   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 258   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 259   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 260   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 261   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 262   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 263   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 264   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 265   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 266   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 267   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 268   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 269   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 270   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 271   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 272   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 273   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 274   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 275   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 276   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 277   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 278   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 279   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 280   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 281   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 282   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 283   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 284   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 285   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 286   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 287   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 288   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 289   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 290   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 291   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 292   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 293   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 294   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 295   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 296   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 297   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 298   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 299   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 300   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 301   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 302   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 303   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 304   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 305   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 306   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 307   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 308   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 309   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 310   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 311   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 312   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 313   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 314   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 315   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 316   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 317   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 318   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 319   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
 320   { UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL }
 321 #else
 322   [0 ... N_DSK_UNITS_MAX-1] = {
 323     UDATA (/* & disk_svc */ NULL, UNIT_FLAGS, M3381_SECTORS), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL
 324   }
 325 #endif
 326 };
 327 
 328 #define DSK_UNIT_IDX(uptr) ((uptr) - dsk_unit)
 329 
 330 static DEBTAB disk_dt[] =
 331   {
 332     { "TRACE",  DBG_TRACE,  NULL },
 333     { "NOTIFY", DBG_NOTIFY, NULL },
 334     { "INFO",   DBG_INFO,   NULL },
 335     { "ERR",    DBG_ERR,    NULL },
 336     { "WARN",   DBG_WARN,   NULL },
 337     { "DEBUG",  DBG_DEBUG,  NULL },
 338     { "ALL",    DBG_ALL,    NULL }, // Don't move as it messes up DBG message
 339     { NULL,     0,          NULL }
 340   };
 341 
 342 static t_stat disk_show_nunits (UNUSED FILE * st, UNUSED UNIT * uptr, UNUSED int val, UNUSED const void * desc)
     /*  */
 343   {
 344     sim_printf("Number of DISK units in system is %d\n", dsk_dev . numunits);
 345     return SCPE_OK;
 346   }
 347 
 348 static t_stat disk_set_nunits (UNUSED UNIT * uptr, UNUSED int32 value, const char * cptr, UNUSED void * desc)
     /*  */
 349   {
 350     if (! cptr)
 351       return SCPE_ARG;
 352     int n = atoi (cptr);
 353     if (n < 1 || n > N_DSK_UNITS_MAX)
 354       return SCPE_ARG;
 355     dsk_dev . numunits = (uint32) n;
 356     return SCPE_OK;
 357   }
 358 
 359 static t_stat disk_show_type (UNUSED FILE * st, UNUSED UNIT * uptr, UNUSED int val, UNUSED const void * desc)
     /*  */
 360   {
 361     int diskUnitIdx = (int) DSK_UNIT_IDX (uptr);
 362     if (diskUnitIdx < 0 || diskUnitIdx >= N_DSK_UNITS_MAX)
 363       {
 364         sim_printf ("error: Invalid unit number %ld\n", (long) diskUnitIdx);
 365         return SCPE_ARG;
 366       }
 367 
 368     sim_printf("type     : %s", diskTypes[dsk_states[diskUnitIdx].typeIdx].typename);
 369 
 370     return SCPE_OK;
 371   }
 372 
 373 static t_stat disk_set_type (UNUSED UNIT * uptr, UNUSED int32 value, const char * cptr, UNUSED void * desc)
     /*  */
 374   {
 375     int diskUnitIdx = (int) DSK_UNIT_IDX (uptr);
 376     if (diskUnitIdx < 0 || diskUnitIdx >= N_DSK_UNITS_MAX)
 377       {
 378         sim_printf ("error: Invalid unit number %ld\n", (long) diskUnitIdx);
 379         return SCPE_ARG;
 380       }
 381 
 382     uint i;
 383     for (i = 0; i < N_DISK_TYPES; i++)
 384       {
 385         if (strcasecmp (cptr, diskTypes[i].typename) == 0)
 386           break;
 387       }
 388     if (i >= N_DISK_TYPES)
 389      {
 390        sim_printf ("Disk type %s unrecognized, expected one of "
 391                    "%s %s %s %s %s %s %s %s\r\n",
 392                    cptr,
 393                    diskTypes[0].typename,
 394                    diskTypes[1].typename,
 395                    diskTypes[2].typename,
 396                    diskTypes[3].typename,
 397                    diskTypes[4].typename,
 398                    diskTypes[5].typename,
 399                    diskTypes[6].typename,
 400                    diskTypes[7].typename);
 401         return SCPE_ARG;
 402       }
 403     dsk_states[diskUnitIdx].typeIdx = i;
 404     dsk_unit[diskUnitIdx].capac = (t_addr) diskTypes[i].capac;
 405     dsk_states[diskUnitIdx].tAndDCapac = tAndDCapac[i];
 406     return SCPE_OK;
 407   }
 408 
 409 static t_stat dsk_show_device_name (UNUSED FILE * st, UNIT * uptr,
     /*  */
 410                                     UNUSED int val, UNUSED const void * desc)
 411   {
 412     int n = (int) DSK_UNIT_IDX (uptr);
 413     if (n < 0 || n >= N_DSK_UNITS_MAX)
 414       return SCPE_ARG;
 415     sim_printf("name     : %s", dsk_states[n].device_name);
 416     return SCPE_OK;
 417   }
 418 
 419 static t_stat dsk_set_device_name (UNIT * uptr, UNUSED int32 value,
     /*  */
 420                                    const char * cptr, UNUSED void * desc)
 421   {
 422     int n = (int) DSK_UNIT_IDX (uptr);
 423     if (n < 0 || n >= N_DSK_UNITS_MAX)
 424       return SCPE_ARG;
 425     if (cptr)
 426       {
 427         strncpy (dsk_states[n].device_name, cptr, MAX_DEV_NAME_LEN-1);
 428         dsk_states[n].device_name[MAX_DEV_NAME_LEN-1] = 0;
 429       }
 430     else
 431       dsk_states[n].device_name[0] = 0;
 432     return SCPE_OK;
 433   }
 434 
 435 //
 436 // Looking at rcp_disk.pl1, it appears that the special interrupt for disks
 437 // only causes rcp to poll the device for status; there don't appear to
 438 // be any status specific bits to send here; signal ready is a misnomer;
 439 // it is just signal.
 440 
 441 t_stat signal_disk_ready (uint dsk_unit_idx) {
     /*  */
 442   // Don't signal if the sim is not actually running....
 443   if (! sim_is_running)
 444     return SCPE_OK;
 445   // if substr (special_status_word, 20, 1) ^= "1"b | substr (special_status_word, 13, 6) ^= "00"b3
 446   // if substr (special_status_word, 34, 3) ^= "001"b
 447   // Note the 34,3 spans 34,35,36; therefore the bits are 1..36, not 0..35
 448   // 20,1 is bit 19
 449   // 13,6, is bits 12..17
 450   // status0 is 19..26
 451   // status1 is 28..35
 452   // so substr (w, 20, 1) is bit 0 of status0
 453   //    substr (w, 13, 6) is the low 6 bits of dev_no
 454   //    substr (w, 34, 3) is the low 3 bits of status 1
 455       //sim_printf ("%s %d %o\n", disk_filename, ro,  mt_unit[dsk_unit_idx] . flags);
 456       //sim_printf ("special int %d %o\n", dsk_unit_idx, mt_unit[dsk_unit_idx] . flags);
 457 
 458   uint ctlr_unit_idx = cables->dsk_to_ctlr[dsk_unit_idx].ctlr_unit_idx;
 459   enum ctlr_type_e ctlr_type = cables->dsk_to_ctlr[dsk_unit_idx].ctlr_type;
 460   if (ctlr_type != CTLR_T_MSP && ctlr_type != CTLR_T_IPC) {
 461     // If None, assume that the cabling hasn't happened yet.
 462     if (ctlr_type != CTLR_T_NONE) {
 463       sim_warn ("loadDisk lost\n");
 464       return SCPE_ARG;
 465     }
 466     return SCPE_OK;
 467   }
 468 
 469 
 470 
 471 
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 473 
 474 
 475 
 476 
 477 
 478 
 479 
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 481 
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 483 
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 485 
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 487 
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 489 
 490 
 491 
 492 
 493 
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 495 
 496 
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 500 
 501 
 502 
 503 
 504 
 505 
 506 
 507   for (uint ctlr_port_num = 0; ctlr_port_num < MAX_CTLR_PORTS; ctlr_port_num ++) {
 508     if (ctlr_type == CTLR_T_MSP) {
 509       if (cables->msp_to_iom[ctlr_unit_idx][ctlr_port_num].in_use) {
 510          uint iom_unit_idx = cables->msp_to_iom[ctlr_unit_idx][ctlr_port_num].iom_unit_idx;
 511          uint chan_num = cables->msp_to_iom[ctlr_unit_idx][ctlr_port_num].chan_num;
 512          uint dev_code = cables->dsk_to_ctlr[dsk_unit_idx].dev_code;
 513 
 514          send_special_interrupt (iom_unit_idx, chan_num, dev_code, 0x40, 01 /* disk pack ready */);
 515          return SCPE_OK;
 516        }
 517      } else {
 518        if (cables->ipc_to_iom[ctlr_unit_idx][ctlr_port_num].in_use) {
 519          uint iom_unit_idx = cables->ipc_to_iom[ctlr_unit_idx][ctlr_port_num].iom_unit_idx;
 520          uint chan_num = cables->ipc_to_iom[ctlr_unit_idx][ctlr_port_num].chan_num;
 521          uint dev_code = cables->dsk_to_ctlr[dsk_unit_idx].dev_code;
 522 
 523          send_special_interrupt (iom_unit_idx, chan_num, dev_code, 0x40, 01 /* disk pack ready */);
 524          return SCPE_OK;
 525        }
 526      }
 527    }
 528    return SCPE_ARG;
 529 
 530 }
 531 
 532 static t_stat disk_set_ready (UNIT * uptr, UNUSED int32 value,
     /*  */
 533                               UNUSED const char * cptr,
 534                               UNUSED void * desc)
 535   {
 536     long disk_unit_idx = DSK_UNIT_IDX (uptr);
 537     if (disk_unit_idx >= (long) dsk_dev.numunits)
 538       {
 539         sim_warn ("%s: error: Invalid unit number %ld\n", __func__, (long) disk_unit_idx);
 540         return SCPE_ARG;
 541       }
 542     return signal_disk_ready ((uint) disk_unit_idx);
 543   }
 544 
 545 t_stat unloadDisk (uint dsk_unit_idx) {
     /*  */
 546   if (dsk_unit [dsk_unit_idx] . flags & UNIT_ATT) {
 547     t_stat stat = sim_disk_detach (& dsk_unit [dsk_unit_idx]);
 548     if (stat != SCPE_OK) {
 549       sim_warn ("%s: sim_disk_detach returned %ld\n", __func__, (long) stat);
 550       return SCPE_ARG;
 551     }
 552   }
 553   return signal_disk_ready ((uint) dsk_unit_idx);
 554 }
 555 
 556 t_stat loadDisk (uint dsk_unit_idx, const char * disk_filename, bool ro) {
     /*  */
 557   if (ro)
 558     dsk_unit[dsk_unit_idx].flags |= MTUF_WRP;
 559   else
 560     dsk_unit[dsk_unit_idx].flags &= ~ MTUF_WRP;
 561   t_stat stat = attach_unit (& dsk_unit [dsk_unit_idx], disk_filename);
 562   if (stat != SCPE_OK) {
 563     sim_printf ("%s: sim_disk_attach returned %d\n", __func__, stat);
 564     return stat;
 565   }
 566   return signal_disk_ready ((uint) dsk_unit_idx);
 567 }
 568 
 569 #define UNIT_WATCH UNIT_V_UF
 570 
 571 static MTAB disk_mod[] =
 572   {
 573 #if !defined(SPEED)
 574     { UNIT_WATCH, 1, "WATCH",   "WATCH",   0, 0, NULL, NULL },
 575     { UNIT_WATCH, 0, "NOWATCH", "NOWATCH", 0, 0, NULL, NULL },
 576 #endif /* if !defined(SPEED) */
 577     {
 578       MTAB_dev_value,                                   /* Mask               */
 579       0,                                                /* Match              */
 580       "NUNITS",                                         /* Print string       */
 581       "NUNITS",                                         /* Match string       */
 582       disk_set_nunits,                                  /* Validation routine */
 583       disk_show_nunits,                                 /* Display routine    */
 584       "Number of DISK units in the system",             /* Value descriptor   */
 585       NULL                                              /* Help               */
 586     },
 587     {
 588       MTAB_unit_value_show,                             /* Mask               */
 589       0,                                                /* Match              */
 590       "TYPE",                                           /* Print string       */
 591       "TYPE",                                           /* Match string       */
 592       disk_set_type,                                    /* Validation routine */
 593       disk_show_type,                                   /* Display routine    */
 594       "disk type",                                      /* Value descriptor   */
 595       "D500, D451, D400, D190, D181, D501, 3380, 3381", /* Help               */
 596     },
 597     {
 598       MTAB_XTD | MTAB_VUN | MTAB_VALR | MTAB_NC,        /* Mask               */
 599       0,                                                /* Match              */
 600       "NAME",                                           /* Print string       */
 601       "NAME",                                           /* Match string       */
 602       dsk_set_device_name,                              /* Validation routine */
 603       dsk_show_device_name,                             /* Display routine    */
 604       "Set the device name",                            /* Value descriptor   */
 605       NULL                                              /* Help               */
 606     },
 607     {
 608       MTAB_XTD | MTAB_VUN | MTAB_NMO | MTAB_VALR,       /* Mask               */
 609       0,                                                /* Match              */
 610       "READY",                                          /* Print string       */
 611       "READY",                                          /* Match string       */
 612       disk_set_ready,                                   /* Validation routine */
 613       NULL,                                             /* Display routine    */
 614       NULL,                                             /* Value descriptor   */
 615       NULL                                              /* Help string        */
 616     },
 617     MTAB_eol
 618   };
 619 
 620 static t_stat disk_reset (UNUSED DEVICE * dptr)
     /*  */
 621   {
 622     return SCPE_OK;
 623   }
 624 
 625 static t_stat disk_attach (UNIT *uptr, CONST char *cptr)
     /*  */
 626   {
 627     int diskUnitIdx = (int) DSK_UNIT_IDX (uptr);
 628     if (diskUnitIdx < 0 || diskUnitIdx >= N_DSK_UNITS_MAX)
 629       {
 630         sim_printf ("error: Invalid unit number %ld\n", (long) diskUnitIdx);
 631         return SCPE_ARG;
 632       }
 633 
 634     return loadDisk ((uint) diskUnitIdx, cptr, false);
 635   }
 636 
 637 // No disks known to Multics had more than 2^24 sectors...
 638 DEVICE dsk_dev = {
 639     "DISK",                /* Name                */
 640     dsk_unit,              /* Units               */
 641     NULL,                  /* Registers           */
 642     disk_mod,              /* Modifiers           */
 643     N_DISK_UNITS,          /* #Units              */
 644     10,                    /* Address radix       */
 645     24,                    /* Address width       */
 646     1,                     /* Address increment   */
 647     8,                     /* Data radix          */
 648     36,                    /* Data width          */
 649     NULL,                  /* Examine             */
 650     NULL,                  /* Deposit             */
 651     disk_reset,            /* Reset               */
 652     NULL,                  /* Boot                */
 653     disk_attach,           /* Attach              */
 654     NULL /*disk_detach*/,  /* Detach              */
 655     NULL,                  /* Context             */
 656     DEV_DEBUG,             /* Flags               */
 657     0,                     /* Debug control flags */
 658     disk_dt,               /* Debug flag names    */
 659     NULL,                  /* Memory size change  */
 660     NULL,                  /* Logical name        */
 661     NULL,                  /* Help                */
 662     NULL,                  /* Attach help         */
 663     NULL,                  /* Attach context      */
 664     NULL,                  /* Description         */
 665     NULL                   /* End                 */
 666 };
 667 
 668 /*
 669  * disk_init()
 670  */
 671 
 672 // Once-only initialization
 673 
 674 void disk_init (void)
     /*  */
 675   {
 676     // Sets diskTypeIdx to 0: 3381
 677     (void)memset (dsk_states, 0, sizeof (dsk_states));
 678 #if defined(LOCKLESS)
 679 # if defined(__FreeBSD__)
 680         pthread_mutexattr_t scu_attr;
 681         pthread_mutexattr_init (& scu_attr);
 682         pthread_mutexattr_settype (& scu_attr, PTHREAD_MUTEX_ADAPTIVE_NP);
 683 # endif /* if defined(__FreeBSD__) */
 684     for (uint i = 0; i < N_DSK_UNITS_MAX; i ++)
 685       {
 686 # if defined(__FreeBSD__)
 687         pthread_mutex_init (& dsk_states[i].dsk_lock, & scu_attr);
 688 # else
 689         pthread_mutex_init (& dsk_states[i].dsk_lock, NULL);
 690 # endif /* if defined(__FreeBSD__) */
 691       }
 692 #endif /* if defined(LOCKLESS) */
 693   }
 694 
 695 static iom_cmd_rc_t diskSeek64 (uint devUnitIdx, uint iomUnitIdx, uint chan)
     /*  */
 696   {
 697     iom_chan_data_t * p            = & iom_chan_data[iomUnitIdx][chan];
 698     struct dsk_state * disk_statep = & dsk_states[devUnitIdx];
 699 
 700     uint typeIdx                     = disk_statep->typeIdx;
 701     if (diskTypes[typeIdx].seekSize != seek_64)
 702       sim_warn ("%s: disk%u sent a SEEK_64 but is 512 sized\n", __func__, typeIdx);
 703 
 704     uint tally = p->DDCW_TALLY;
 705 
 706     // Seek specific processing
 707 
 708     if (tally != 1)
 709       {
 710         sim_printf ("disk seek dazed by tally %d != 1\n", tally);
 711         p->stati = 04510; // Cmd reject, invalid inst. seq.
 712         return IOM_CMD_ERROR;
 713       }
 714 
 715     word36 seekData;
 716     uint count;
 717     iom_indirect_data_service (iomUnitIdx, chan, & seekData, &count, false);
 718     // POLTS claims that seek data doesn't count as an I/O xfer
 719     p->initiate = true;
 720     if (count != 1)
 721       sim_warn ("%s: count %d not 1\n", __func__, count);
 722 
 723 #if defined(POLTS_DISK_TESTING)
 724     if_sim_debug (DBG_TRACE, & dsk_dev) { sim_printf ("// Seek address %012"PRIo64"\n", seekData); }
 725 #endif
 726 
 727 // disk_control.pl1:
 728 //   quentry.sector = bit (sector, 21);  /* Save the disk device address. */
 729 // suggests seeks are 21 bits. The largest sector number is D501 1077759; 4040777 in base 8;
 730 // 21 bits.
 731 
 732     seekData &= MASK21;
 733     if (seekData >= diskTypes[typeIdx].capac)
 734       {
 735         disk_statep->seekValid = false;
 736         p->stati               = 04304; // Invalid seek address
 737         return IOM_CMD_ERROR;
 738       }
 739     disk_statep->seekValid    = true;
 740     disk_statep->seekPosition = (uint) seekData;
 741     p->stati = 04000; // Channel ready
 742     return IOM_CMD_PROCEED;
 743   }
 744 
 745 static int diskSeek512 (uint devUnitIdx, uint iomUnitIdx, uint chan)
     /*  */
 746   {
 747     iom_chan_data_t * p            = & iom_chan_data[iomUnitIdx][chan];
 748     struct dsk_state * disk_statep = & dsk_states[devUnitIdx];
 749     uint typeIdx                   = disk_statep->typeIdx;
 750     if (diskTypes[typeIdx].seekSize != seek_512)
 751       sim_warn ("%s: disk%u sent a SEEK_512 but is 64 sized\n", __func__, typeIdx);
 752 
 753     uint tally = p->DDCW_TALLY;
 754 
 755     // Seek specific processing
 756 
 757     if (tally != 1)
 758       {
 759         sim_printf ("disk seek dazed by tally %d != 1\n", tally);
 760         //p->stati = 04510; // Cmd reject, invalid inst. seq.
 761         //p->chanStatus = chanStatIncorrectDCW;
 762         //return -1;
 763         tally = 1;
 764       }
 765 
 766     word36 seekData;
 767     uint count;
 768     iom_indirect_data_service (iomUnitIdx, chan, & seekData, &count, false);
 769     // POLTS claims that seek data doesn't count as an I/O xfer
 770     p->initiate = true;
 771     if (count != 1)
 772       sim_warn ("%s: count %d not 1\n", __func__, count);
 773 
 774     seekData &= MASK21;
 775     if (seekData >= diskTypes[typeIdx].capac)
 776       {
 777         disk_statep->seekValid = false;
 778         p->stati = 04304; // Invalid seek address
 779         return -1;
 780       }
 781     disk_statep->seekValid    = true;
 782     disk_statep->seekPosition = (uint)seekData;
 783     p->stati                  = 04000; // Channel ready
 784     return 0;
 785   }
 786 
 787 static iom_cmd_rc_t diskSeekSpecial (uint devUnitIdx, uint iomUnitIdx, uint chan)
     /*  */
 788   {
 789     iom_chan_data_t * p            = & iom_chan_data[iomUnitIdx][chan];
 790     struct dsk_state * disk_statep = & dsk_states[devUnitIdx];
 791 
 792     uint typeIdx = disk_statep->typeIdx;
 793     //if (diskTypes[typeIdx].seekSize != seek_64)
 794       //sim_warn ("%s: disk%u sent a SEEK_64 but is 512 sized\n", __func__, typeIdx);
 795 
 796     uint tally = p->DDCW_TALLY;
 797 
 798     // Seek specific processing
 799 
 800     if (tally != 1)
 801       {
 802         sim_printf ("disk seek dazed by tally %d != 1\n", tally);
 803         //p->stati = 04510; // Cmd reject, invalid inst. seq.
 804         //p->chanStatus = chanStatIncorrectDCW;
 805         //return IOM_CMD_ERROR;
 806         tally = 1;
 807       }
 808 
 809     word36 seekData;
 810     uint count;
 811     iom_indirect_data_service (iomUnitIdx, chan, & seekData, &count, false);
 812     // POLTS claims that seek data doesn't count as an I/O xfer
 813     p->initiate  = true;
 814     if (count   != 1)
 815       sim_warn ("%s: count %d not 1\n", __func__, count);
 816 
 817 #if defined(POLTS_DISK_TESTING)
 818     if_sim_debug (DBG_TRACE, & dsk_dev)
 819       {
 820         sim_printf ("// Seek address %012"PRIo64"\n", seekData);
 821       }
 822 #endif
 823 
 824     seekData &= MASK21;
 825     if (seekData >= dsk_states[typeIdx].tAndDCapac)
 826       {
 827         p->stati               = 04304; // Invalid seek address
 828         disk_statep->seekValid = false;
 829         //p->chanStatus = chanStatIncomplete;
 830         return IOM_CMD_ERROR;
 831       }
 832     disk_statep->seekValid    = true;
 833     disk_statep->seekPosition = (uint) seekData;
 834     p->stati                  = 04000; // Channel ready
 835     return IOM_CMD_PROCEED;
 836   }
 837 
 838 static int diskRead (uint devUnitIdx, uint iomUnitIdx, uint chan)
     /*  */
 839   {
 840     iom_chan_data_t * p            = & iom_chan_data[iomUnitIdx][chan];
 841     UNIT * unitp                   = & dsk_unit[devUnitIdx];
 842     struct dsk_state * disk_statep = & dsk_states[devUnitIdx];
 843     uint typeIdx                   = disk_statep->typeIdx;
 844     uint sectorSizeWords           = diskTypes[typeIdx].sectorSizeWords;
 845     uint sectorSizeBytes           = ((36 * sectorSizeWords) / 8);
 846 
 847     if (! unitp->fileref) {
 848       p->stati = 04240; // device offline
 849 #if defined(POLTS_TESTING)
 850 if (chan == 014)
 851     if_sim_debug (DBG_TRACE, & dsk_dev) sim_printf ("// diskRead device offline\r\n");
 852 #endif
 853       return -1;
 854     }
 855     if (! disk_statep->seekValid) {
 856       p->stati               = 04510; // Invalid instruction sequence
 857       disk_statep->seekValid = false;
 858 #if defined(POLTS_TESTING)
 859 if (chan == 014)
 860     if_sim_debug (DBG_TRACE, & dsk_dev) sim_printf ("// diskRead seek invalid\r\n");
 861 #endif
 862       return IOM_CMD_ERROR;
 863     }
 864     uint tally = p->DDCW_TALLY;
 865     if (tally == 0)
 866       {
 867         tally = 4096;
 868       }
 869 
 870     int rc = fseek (unitp->fileref,
 871                 (long) ((long)disk_statep->seekPosition * (long)sectorSizeBytes),
 872                 SEEK_SET);
 873     if (rc)
 874       {
 875         sim_warn ("%s: fseek (read) returned %d, errno %d\n", __func__, rc, errno);
 876         p->stati = 04202; // attn, seek incomplete
 877 #if defined(POLTS_TESTING)
 878 if (chan == 014)
 879     if_sim_debug (DBG_TRACE, & dsk_dev) sim_printf ("// diskRead seek incomplete\r\n");
 880 #endif
 881         return -1;
 882       }
 883 
 884     // Convert from word36 format to packed72 format
 885 
 886     // round tally up to sector boundary
 887 
 888     // this math assumes tally is even.
 889 
 890     uint tallySectors = (tally + sectorSizeWords - 1) /
 891                          sectorSizeWords;
 892     uint tallyWords   = tallySectors * sectorSizeWords;
 893     //uint tallyBytes = tallySectors * sectorSizeBytes;
 894     uint p72ByteCnt   = (tallyWords * 36) / 8;
 895     uint8 diskBuffer[p72ByteCnt];
 896     (void)memset (diskBuffer, 0, sizeof (diskBuffer));
 897 
 898     (void)fflush (unitp->fileref);
 899     rc = (int) fread (diskBuffer, sectorSizeBytes,
 900                 tallySectors,
 901                 unitp->fileref);
 902 
 903     if (rc == 0) // EOF or error
 904       {
 905         if (ferror (unitp->fileref))
 906           {
 907             p->stati = 04202; // attn, seek incomplete
 908             //p->chanStatus = chanStatIncorrectDCW;
 909 #if defined(POLTS_TESTING)
 910 if (chan == 014)
 911     if_sim_debug (DBG_TRACE, & dsk_dev) sim_printf ("// diskRead seek incomplete2\r\n");
 912 #endif
 913             return -1;
 914           }
 915         // We ignore short reads-- we assume that they are reads
 916         // past the write highwater mark, and return zero data,
 917         // just as if the disk had been formatted with zeros.
 918       }
 919     disk_statep->seekPosition += tallySectors;
 920 
 921     uint wordsProcessed = 0;
 922     word36 buffer[tally];
 923     for (uint i = 0; i < tally; i ++)
 924       {
 925         word36 w;
 926         extractWord36FromBuffer (diskBuffer, p72ByteCnt, & wordsProcessed,
 927                                  & w);
 928         buffer[i] = w;
 929       }
 930     iom_indirect_data_service (iomUnitIdx, chan, buffer,
 931                             & wordsProcessed, true);
 932     p->stati = 04000;
 933 #if defined(POLTS_TESTING)
 934 if (chan == 014)
 935     if_sim_debug (DBG_TRACE, & dsk_dev) sim_printf ("// diskRead ok\r\n");
 936 #endif
 937     return 0;
 938   }
 939 
 940 static int diskWrite (uint devUnitIdx, uint iomUnitIdx, uint chan)
     /*  */
 941   {
 942     iom_chan_data_t * p            = & iom_chan_data[iomUnitIdx][chan];
 943     UNIT * unitp                   = & dsk_unit[devUnitIdx];
 944     struct dsk_state * disk_statep = & dsk_states[devUnitIdx];
 945     uint typeIdx                   = disk_statep->typeIdx;
 946     uint sectorSizeWords           = diskTypes[typeIdx].sectorSizeWords;
 947     uint sectorSizeBytes           = ((36 * sectorSizeWords) / 8);
 948 
 949     if (! unitp->fileref) {
 950       p->stati = 04240; // device offline
 951       return -1;
 952     }
 953 
 954     if (! disk_statep->seekValid) {
 955       p->stati               = 04510; // Invalid instruction sequence
 956       disk_statep->seekValid = false;
 957       return IOM_CMD_ERROR;
 958     }
 959 
 960     uint tally = p->DDCW_TALLY;
 961 
 962     if (tally == 0)
 963       {
 964         tally = 4096;
 965       }
 966 
 967     int rc = fseek (unitp->fileref,
 968                 (long) ((long)disk_statep->seekPosition * (long)sectorSizeBytes),
 969                 SEEK_SET);
 970     if (rc)
 971       {
 972         sim_printf ("fseek (read) returned %d, errno %d\n", rc, errno);
 973         p->stati = 04202; // attn, seek incomplete
 974         return -1;
 975       }
 976 
 977     // Convert from word36 format to packed72 format
 978 
 979     // round tally up to sector boundary
 980 
 981     // this math assumes tally is even.
 982 
 983     uint tallySectors = (tally + sectorSizeWords - 1) /
 984                          sectorSizeWords;
 985     uint tallyWords   = tallySectors * sectorSizeWords;
 986     uint p72ByteCnt   = (tallyWords * 36) / 8;
 987     uint8 diskBuffer[p72ByteCnt];
 988     (void)memset (diskBuffer, 0, sizeof (diskBuffer));
 989     uint wordsProcessed = 0;
 990 
 991     word36 buffer[tally];
 992     iom_indirect_data_service (iomUnitIdx, chan, buffer,
 993                             & wordsProcessed, false);
 994     wordsProcessed = 0;
 995     for (uint i = 0; i < tally; i ++)
 996       {
 997         insertWord36toBuffer (diskBuffer, p72ByteCnt, & wordsProcessed,
 998                               buffer[i]);
 999       }
1000 
1001     rc = (int) fwrite (diskBuffer, sectorSizeBytes,
1002                  tallySectors,
1003                  unitp->fileref);
1004     (void)fflush (unitp->fileref);
1005 
1006     if (rc != (int) tallySectors)
1007       {
1008         sim_printf ("fwrite returned %d, errno %d\n", rc, errno);
1009         p->stati      = 04202; // attn, seek incomplete
1010         p->chanStatus = chanStatIncorrectDCW;
1011         return -1;
1012       }
1013 
1014     disk_statep->seekPosition += tallySectors;
1015 
1016     p->stati = 04000;
1017     return 0;
1018   }
1019 
1020 static int readStatusRegister (uint devUnitIdx, uint iomUnitIdx, uint chan)
     /*  */
1021   {
1022     iom_chan_data_t * p = & iom_chan_data[iomUnitIdx][chan];
1023     UNIT * unitp        = & dsk_unit[devUnitIdx];
1024 
1025     uint tally = p->DDCW_TALLY;
1026 
1027     if (tally != 4 && tally != 2)
1028       {
1029         sim_warn ("%s: RSR expected tally of 2 or 4, is %d\n",
1030                   __func__, tally);
1031       }
1032     if (tally == 0)
1033       {
1034         tally = 4096;
1035       }
1036 
1037 // XXX need status register data format
1038 // system_library_tools/source/bound_io_tools_.s.archive/analyze_detail_stat_.pl1  anal_fips_disk_().
1039 
1040 #if defined(TESTING)
1041     sim_warn ("Need status register data format\n");
1042 #endif
1043     word36 buffer[tally];
1044     (void)memset (buffer, 0, sizeof (buffer));
1045 #if defined(POLTS_DISK_TESTING)
1046 buffer[0] = nCmds;
1047 #endif
1048     uint wordsProcessed = tally;
1049     iom_indirect_data_service (iomUnitIdx, chan, buffer,
1050                             & wordsProcessed, true);
1051     p->charPos = 0;
1052     p->stati   = 04000;
1053     if (! unitp->fileref)
1054       p->stati = 04240; // device offline
1055     return 0;
1056   }
1057 
1058 static int diskRdCtrlReg (uint dev_unit_idx, uint iom_unit_idx, uint chan) {
     /*  */
1059   iom_chan_data_t * p = & iom_chan_data[iom_unit_idx][chan];
1060   UNIT * unitp        = & dsk_unit[dev_unit_idx];
1061   p->charPos          = 0;
1062   p->stati            = 04000;
1063   if (! unitp->fileref)
1064     p->stati = 04240; // device offline
1065   return 0;
1066 }
1067 
1068 static int read_configuration (uint dev_unit_idx, uint iom_unit_idx, uint chan)
     /*  */
1069   {
1070     iom_chan_data_t * p = & iom_chan_data[iom_unit_idx][chan];
1071     UNIT * unitp        = & dsk_unit[dev_unit_idx];
1072 
1073     uint tally = p->DDCW_TALLY;
1074 
1075 // poll_mpc.pl1
1076 //
1077 // dcl  1 dau_buf aligned based (workp),   /* The IOI buffer segment */
1078 //        2 cf_idcw bit (36),              /* Read Configuration (24o) */
1079 //        2 cf_dcw bit (36),               /* Addr=dau_buf.data(0), tally=65 */
1080 //        2 st_idcw bit (36),              /* Read/Clear Statistics (16o) */
1081 //        2 st_dcw bit (36),               /* Address=dau_buf.data(130), tally=315 */
1082 //        2 data (0:759) bit (18) unal;    /* Config & statistics area */
1083 
1084 // XXX need status register data format
1085 // system_library_tools/source/bound_io_tools_.s.archive/analyze_detail_stat_.pl1  anal_fips_disk_().
1086 
1087 // poll_mpc.pl1
1088 //
1089 // dcl  1 dau_buf aligned based (workp),   /* The IOI buffer segment */
1090 //        2 cf_idcw bit (36),              /* Read Configuration (24o) */
1091 //        2 cf_dcw bit (36),               /* Addr=dau_buf.data(0), tally=65 */
1092 //        2 st_idcw bit (36),              /* Read/Clear Statistics (16o) */
1093 //        2 st_dcw bit (36),               /* Address=dau_buf.data(130), tally=315 */
1094 //        2 data (0:759) bit (18) unal;    /* Config & statistics area */
1095 
1096 //  dau_buf.data:
1097 //    0                                35
1098 //   +----------------+------------------+
1099 //   |    data(0)     |   data(1)        |
1100 //   +----------------+------------------+
1101 //   |    data(2)     |   data(3)        |
1102 //   +----------------+------------------+
1103 
1104 // dcl  dau_data (0:759) bit (16) unal;                        /* DAU config and stats */
1105 
1106 //
1107 //          do i = 0 to 759;
1108 //            substr (dau_data (i), 1, 8) = substr (dau_buf.data (i), 2, 8);
1109 //            substr (dau_data (i), 9, 8) = substr (dau_buf.data (i), 11, 8);
1110 //          end;
1111 //
1112 //   substr (dau_buf.data (i), 2, 8)
1113 //
1114 //    0 1 2 3 4 5 6 7 8     ....       17
1115 //   +-----------------------------------+
1116 //   | |X|X|X|X|X|X|X|X| |Y|Y|Y|Y|Y|Y|Y|Y|
1117 //   +-----------------------------------+
1118 //
1119 //   substr (dau_data (i), 1, 8)
1120 //
1121 //    0 1 2 3 4 5 6 7 8   ....     15
1122 //   +-------------------------------+
1123 //   |X|X|X|X|X|X|X|X|Y|Y|Y|Y|Y|Y|Y|Y|
1124 //   +-------------------------------+
1125 
1126 // dcl  1 dau_char based (image_ptr) unaligned,   /* Config data */
1127 //       2 type bit (8),                          /* = 12 HEX */
1128 //       2 hw_rev bit (8) unal,                   /* DAU rev */
1129 //       2 fw_maj_rev bit (8) unal,               /* firmware rev letter */
1130 //       2 fw_sub_rev bit (8) unal;               /* firmware rev number */
1131 //       2 dev (64),                              /* seq'ed by dev# */
1132 //                       /* all 4 bytes zero, if device NEVER configured */
1133 //         3 type fixed bin (8) uns unal,         /* device type */
1134 //         3 number fixed bin (8) uns unal,       /* device number, =FF if not configured */
1135 //         3 summary_status bit (8) unal,         /* device SS reg */
1136 //         3 port_number fixed bin (8) uns unal;  /* device DAU port */
1137 
1138 // We know that we are an MSP and not an IPC as this command is only issued
1139 // to MSPs.
1140 
1141     uint ctlr_unit_idx = get_ctlr_idx (iom_unit_idx, chan);
1142     struct ctlr_to_dev_s * dev_p;
1143     if (cables->iom_to_ctlr[iom_unit_idx][chan].ctlr_type == CTLR_T_IPC)
1144       dev_p = cables->ipc_to_dsk[ctlr_unit_idx];
1145     else
1146       dev_p = cables->msp_to_dsk[ctlr_unit_idx];
1147 
1148 // XXX Temp
1149     word36 buffer[tally];
1150     (void)memset (buffer, 0, sizeof (buffer));
1151     putbits36_9 (& buffer[0],  0, 0x12);
1152     putbits36_9 (& buffer[0],  9, 1);    // h/w revision
1153     putbits36_9 (& buffer[0], 18, '1');  // fw maj revision
1154     putbits36_9 (& buffer[0], 27, 'a');  // fw sub revision
1155 
1156     for (word9 dev_num = 0; dev_num < N_DEV_CODES; dev_num ++)
1157       {
1158          if (! dev_p[dev_num].in_use)
1159            continue;
1160          uint dsk_unit_idx = dev_p[dev_num].unit_idx;
1161          // word9 dau_type    = (word9) diskTypes[dsk_unit_idx].dau_type;
1162          // ubsan/asan
1163          word9 dau_type    = (word9) diskTypes[dsk_states[dsk_unit_idx].typeIdx].dau_type;
1164          putbits36_9 (& buffer[1+dev_num],  0, dau_type); // dev.type
1165          putbits36_9 (& buffer[1+dev_num],  9, dev_num);  // dev.number
1166          putbits36_9 (& buffer[1+dev_num], 18, 0);        // dev.summary_status // XXX
1167          putbits36_9 (& buffer[1+dev_num], 27, dev_num);  // dev.port_number
1168      }
1169 
1170     uint wordsProcessed = tally;
1171     iom_indirect_data_service (iom_unit_idx, chan, buffer,
1172                             & wordsProcessed, true);
1173     p->charPos = 0;
1174     p->stati   = 04000;
1175     if (! unitp->fileref)
1176       p->stati = 04240; // device offline
1177     return 0;
1178   }
1179 
1180 static int read_and_clear_statistics (uint dev_unit_idx, uint iom_unit_idx, uint chan)
     /*  */
1181   {
1182 #if defined(TESTING)
1183     cpu_state_t * cpup  = _cpup;
1184 #endif
1185     iom_chan_data_t * p = & iom_chan_data[iom_unit_idx][chan];
1186     UNIT * unitp        = & dsk_unit[dev_unit_idx];
1187 
1188     sim_debug (DBG_NOTIFY, & dsk_dev, "Read %d\n", dev_unit_idx);
1189 
1190     p->charPos = 0;
1191     p->stati   = 04000;
1192     if (! unitp->fileref)
1193       p->stati = 04240; // device offline
1194     return 0;
1195   }
1196 
1197 // source/library_dir_dir/system_library_1/source/bound_rcp_.s.archive/rcp_disk_.pl1
1198 //
1199 //  dcl set_standby_command    bit (6) internal static init ("72"b3);
1200 //  dcl request_status_command bit (6) internal static init ("00"b3);
1201 //  dcl read_command           bit (6) internal static init ("25"b3);
1202 //  dcl reset_status_command   bit (6) internal static init ("40"b3);
1203 
1204 iom_cmd_rc_t dsk_iom_cmd (uint iomUnitIdx, uint chan) {
     /*  */
1205 #if defined(POLTS_DISK_TESTING)
1206 nCmds ++;
1207 #endif
1208 #if defined(TESTING)
1209   cpu_state_t * cpup  = _cpup;
1210 #endif
1211   iom_chan_data_t * p = & iom_chan_data[iomUnitIdx][chan];
1212   uint ctlr_unit_idx  = get_ctlr_idx (iomUnitIdx, chan);
1213   uint devUnitIdx;
1214 
1215 #if defined(POLTS_DISK_TESTING)
1216 if (chan == 014)   {if_sim_debug (DBG_TRACE, & dsk_dev) { dumpDCW (p->DCW, 0); }}
1217 #endif
1218   if (cables->iom_to_ctlr[iomUnitIdx][chan].ctlr_type == CTLR_T_IPC)
1219     devUnitIdx = cables->ipc_to_dsk[ctlr_unit_idx][p->IDCW_DEV_CODE].unit_idx;
1220   else if (cables->iom_to_ctlr[iomUnitIdx][chan].ctlr_type == CTLR_T_MSP)
1221     devUnitIdx = cables->msp_to_dsk[ctlr_unit_idx][p->IDCW_DEV_CODE].unit_idx;
1222   else {
1223     sim_warn ("%s: Can't find controller (%d)\n", __func__, cables->iom_to_ctlr[iomUnitIdx][chan].ctlr_type);
1224     return IOM_CMD_ERROR;
1225   }
1226 
1227   UNIT * unitp = & dsk_unit[devUnitIdx];
1228   struct dsk_state * disk_statep = & dsk_states[devUnitIdx];
1229 
1230   iom_cmd_rc_t rc = IOM_CMD_PROCEED;
1231 
1232 #if defined(LOCKLESS)
1233   lock_ptr (& dsk_states->dsk_lock); //-V619
1234 #endif
1235 
1236   // IDCW?
1237   if (p->DCW_18_20_CP == 7) {
1238     // IDCW
1239     disk_statep->io_mode = disk_no_mode;
1240     switch (p->IDCW_DEV_CMD) {
1241       case 000: // CMD 00 Request status
1242 #if defined(POLTS_DISK_TESTING)
1243 //if (chan == 014)
1244 #endif /* if defined(POLTS_DISK_TESTING) */
1245 #if !defined(POLTS_DISK_TESTING)
1246         if_sim_debug (DBG_TRACE, & dsk_dev) {
1247           sim_printf ("// Disk Request Status\r\n");
1248         }
1249 #endif /* if !defined(POLTS_DISK_TESTING) */
1250         //disk_statep->io_mode = disk_no_mode;
1251         p->stati = 04000;
1252         if (! unitp->fileref)
1253           p->stati = 04240; // device offline
1254         break;
1255 
1256       case 016: // CMD 16 Read and Clear Statistics -- Model 800
1257 #if defined(POLTS_DISK_TESTING)
1258 if (chan == 014)
1259 #endif /* if defined(POLTS_DISK_TESTING) */
1260         if_sim_debug (DBG_TRACE, & dsk_dev) {
1261           sim_printf ("// Disk Read And Clear Statistics\r\n");
1262         }
1263         disk_statep->io_mode = disk_rd_clr_stats;
1264         p->recordResidue --;
1265         p->stati             = 04000;
1266         if (! unitp->fileref)
1267           p->stati = 04240; // device offline
1268         break;
1269 
1270       case 022: // CMD 22 Read Status Register
1271 #if defined(POLTS_DISK_TESTING)
1272 if (chan == 014)
1273 #endif
1274         if_sim_debug (DBG_TRACE, & dsk_dev) {
1275           sim_printf ("// Disk Read Status Register\r\n");
1276         }
1277         disk_statep->io_mode = disk_rd_status_reg;
1278         p->recordResidue --;
1279         p->stati             = 04000;
1280         if (! unitp->fileref)
1281           p->stati = 04240; // device offline
1282         break;
1283 
1284       case 024: // CMD 24 Read configuration -- Model 800
1285 #if defined(POLTS_DISK_TESTING)
1286 if (chan == 014)
1287 #endif
1288         if_sim_debug (DBG_TRACE, & dsk_dev) {
1289           sim_printf ("// Disk Read Configuration\r\n");
1290         }
1291         disk_statep->io_mode = disk_rd_config;
1292         p->recordResidue --;
1293         p->stati             = 04000;
1294         if (! unitp->fileref)
1295           p->stati = 04240; // device offline
1296         break;
1297 
1298       case 025: // CMD 25 READ
1299 #if defined(POLTS_DISK_TESTING)
1300 if (chan == 014)
1301 #endif
1302         if_sim_debug (DBG_TRACE, & dsk_dev) {
1303           sim_printf ("// Disk Read\r\n");
1304         }
1305         disk_statep->io_mode = disk_rd;
1306         p->recordResidue --;
1307         p->stati             = 04000;
1308         if (! unitp->fileref)
1309           p->stati = 04240; // device offline
1310         break;
1311 
1312       case 026: // CMD 26 READ CONTROL REGISTER
1313 #if defined(POLTS_DISK_TESTING)
1314 if (chan == 014)
1315 #endif
1316         if_sim_debug (DBG_TRACE, & dsk_dev) {
1317           sim_printf ("// Disk Read Control Register\r\n");
1318         }
1319         disk_statep->io_mode = disk_rd_ctrl_reg;
1320         p->recordResidue --;
1321         p->stati             = 04000;
1322         if (! unitp->fileref)
1323           p->stati = 04240; // device offline
1324         break;
1325 
1326       case 030: // CMD 30 SEEK_512
1327 #if defined(POLTS_DISK_TESTING)
1328 if (chan == 014)
1329 #endif
1330         if_sim_debug (DBG_TRACE, & dsk_dev) {
1331           sim_printf ("// Disk Seek 512\r\n");
1332         }
1333         disk_statep->io_mode = disk_seek_512;
1334         p->recordResidue --;
1335         p->stati             = 04000;
1336         if (! unitp->fileref)
1337           p->stati = 04240; // device offline
1338         break;
1339 
1340       case 031: // CMD 31 WRITE
1341       case 033: // CMD 31 WRITE AND COMPARE
1342 #if defined(POLTS_DISK_TESTING)
1343 if (chan == 014)
1344 #endif
1345         if_sim_debug (DBG_TRACE, & dsk_dev) {
1346           sim_printf ("// Disk Write\r\n");
1347         }
1348         disk_statep->io_mode = disk_wr;
1349         p->recordResidue --;
1350         p->stati             = 04000;
1351         if (! unitp->fileref)
1352           p->stati = 04240; // device offline
1353         break;
1354 
1355       case 034: // CMD 34 SEEK_64
1356 #if defined(POLTS_DISK_TESTING)
1357 if (chan == 014)
1358 #endif
1359         if_sim_debug (DBG_TRACE, & dsk_dev) {
1360           sim_printf ("// Disk Seek 64\r\n");
1361         }
1362         disk_statep->io_mode = disk_seek_64;
1363         p->recordResidue --;
1364         p->stati             = 04000;
1365         if (! unitp->fileref)
1366           p->stati = 04240; // device offline
1367         break;
1368 
1369       case 036: // CMD 36 SPECIAL SEEK (T&D) // Make it work like SEEK_64 and
1370                                              // hope for the best
1371 #if defined(POLTS_DISK_TESTING)
1372 if (chan == 014)
1373 #endif
1374         if_sim_debug (DBG_TRACE, & dsk_dev) {
1375           sim_printf ("// Disk Special Seek\r\n");
1376         }
1377         disk_statep->io_mode = disk_special_seek;
1378         p->recordResidue --;
1379         p->stati             = 04000;
1380         if (! unitp->fileref)
1381           p->stati = 04240; // device offline
1382         break;
1383 
1384       case 040: // CMD 40 Reset status
1385 #if defined(POLTS_DISK_TESTING)
1386 if (chan == 014)
1387 #endif
1388         if_sim_debug (DBG_TRACE, & dsk_dev) {
1389           sim_printf ("// Disk Reset Status\r\n");
1390         }
1391         p->stati    = 04000;
1392         // XXX POLTS wants this; I don't understand why.
1393         p->recordResidue --;
1394         p->initiate = false; // According to POLTS
1395         p->isRead   = false;
1396         // T&D probing
1397         if (p->IDCW_DEV_CODE == 077) {
1398           p->stati = 04502; // invalid device code
1399 #if defined(LOCKLESS)
1400           unlock_ptr (& dsk_states->dsk_lock); //-V619
1401 #endif
1402           return IOM_CMD_DISCONNECT;
1403         }
1404         if (! unitp->fileref)
1405           p->stati = 04240; // device offline
1406         break;
1407 
1408       case 042: // CMD 42 RESTORE
1409 #if defined(POLTS_DISK_TESTING)
1410 if (chan == 014)
1411 #endif
1412         if_sim_debug (DBG_TRACE, & dsk_dev) {
1413           sim_printf ("// Disk Restore\r\n");
1414         }
1415         p->stati    = 04000;
1416         // XXX POLTS wants this; I don't understand why.
1417         p->recordResidue --;
1418         p->initiate = false; // According to POLTS
1419         if (! unitp->fileref)
1420           p->stati = 04240; // device offline
1421 
1422         disk_statep->seekValid = false;
1423 
1424         break;
1425 
1426       case 072: // CMD 72 SET STANDBY
1427 #if defined(POLTS_DISK_TESTING)
1428 if (chan == 014)
1429 #endif
1430         if_sim_debug (DBG_TRACE, & dsk_dev) {
1431           sim_printf ("// Disk Set Standby\r\n");
1432         }
1433         p->stati = 04000;
1434         if (! unitp->fileref)
1435           p->stati = 04240; // device offline
1436         break;
1437 
1438       default:
1439 #if defined(POLTS_DISK_TESTING)
1440 if (chan == 014)
1441 #endif
1442         if_sim_debug (DBG_TRACE, & dsk_dev) {
1443           sim_printf ("// Disk unknown command %o\r\n", p->IDCW_DEV_CMD);
1444         }
1445         p->stati      = 04501;
1446         p->chanStatus = chanStatIncorrectDCW;
1447         if (p->IDCW_DEV_CMD != 051) // ignore bootload console probe
1448           sim_warn ("%s: Unrecognized device command %02o\n", __func__, p->IDCW_DEV_CMD);
1449         rc =  IOM_CMD_ERROR;
1450         goto done;
1451     }
1452     goto done;
1453   } // IDCW
1454 
1455   // Not IDCW; TDCW are captured in IOM, so must be IOTD, IOTP or IOTNP
1456   switch (disk_statep->io_mode) {
1457     case disk_no_mode:
1458 #if defined(POLTS_DISK_TESTING)
1459 if (chan == 014)
1460 #endif
1461       if_sim_debug (DBG_TRACE, & dsk_dev) {
1462         sim_printf ("// Disk IOT No Mode\r\n");
1463       }
1464 // It appears that in some cases Multics builds a dcw list from a generic
1465 // "single IDCW plus optional DDCW" template. That template sets the IDCW
1466 // channel command to "record", regardless of whether or not the
1467 // instruction needs an DDCW. In particular, disk_ctl pings the disk by
1468 // sending a "Reset status" with "record" and an apparently uninitialized
1469 // IOTD. The payload channel will send the IOTD because of the "record";
1470 // the Reset Status command left IO mode at "no mode" so we don't know what
1471 // to do with it. Since this appears benign, we will assume that the
1472 // original H/W ignored, and so shall we.
1473 
1474       //sim_warn ("%s: Unexpected IOTx\n", __func__);
1475       //rc = IOM_CMD_ERROR;
1476       goto done;
1477 
1478     case disk_rd_clr_stats: {
1479 #if defined(POLTS_DISK_TESTING)
1480 if (chan == 014)
1481 #endif
1482         if_sim_debug (DBG_TRACE, & dsk_dev) {
1483           sim_printf ("// Disk IOT Rd And Clr Stats\r\n");
1484         }
1485         int rc1 = read_and_clear_statistics (devUnitIdx, iomUnitIdx, chan);
1486         if (rc1) {
1487           rc = IOM_CMD_ERROR;
1488           goto done;
1489         }
1490       }
1491       break;
1492 
1493     case disk_rd_status_reg: {
1494 #if defined(POLTS_DISK_TESTING)
1495 if (chan == 014)
1496 #endif
1497         if_sim_debug (DBG_TRACE, & dsk_dev) {
1498           sim_printf ("// Disk IOT Rd Status Reg\r\n");
1499         }
1500         int rc1 = readStatusRegister (devUnitIdx, iomUnitIdx, chan);
1501         if (rc1) {
1502           rc = IOM_CMD_ERROR;
1503           goto done;
1504         }
1505       }
1506       break;
1507 
1508     case disk_rd_config: {
1509 #if defined(POLTS_DISK_TESTING)
1510 if (chan == 014)
1511 #endif
1512         if_sim_debug (DBG_TRACE, & dsk_dev) {
1513           sim_printf ("// Disk IOT Rd Config\r\n");
1514         }
1515         // XXX missing. see poll_mpc.pl1, poll_mpc_data.incl.pl1
1516         int rc1 = read_configuration (devUnitIdx, iomUnitIdx, chan);
1517         if (rc1) {
1518           rc = IOM_CMD_ERROR;
1519           goto done;
1520         }
1521       }
1522       break;
1523 
1524     case disk_rd: {
1525 #if defined(POLTS_DISK_TESTING)
1526 if (chan == 014)
1527 #endif
1528         if_sim_debug (DBG_TRACE, & dsk_dev) {
1529           sim_printf ("// Disk IOT Read\r\n");
1530         }
1531         int rc1 = diskRead (devUnitIdx, iomUnitIdx, chan);
1532         if (rc1) {
1533           rc = IOM_CMD_ERROR;
1534           goto done;
1535         }
1536       }
1537       break;
1538 
1539     case disk_rd_ctrl_reg: {
1540 #if defined(POLTS_DISK_TESTING)
1541 if (chan == 014)
1542 #endif
1543         if_sim_debug (DBG_TRACE, & dsk_dev) {
1544           sim_printf ("// Disk IOT Read Control Register\r\n");
1545         }
1546         int rc1 = diskRdCtrlReg (devUnitIdx, iomUnitIdx, chan);
1547         if (rc1) {
1548           rc = IOM_CMD_ERROR;
1549           goto done;
1550         }
1551       }
1552       break;
1553 
1554     case disk_seek_512: {
1555 #if defined(POLTS_DISK_TESTING)
1556 if (chan == 014)
1557 #endif
1558         if_sim_debug (DBG_TRACE, & dsk_dev) {
1559           sim_printf ("// Disk IOT Seek 512\r\n");
1560         }
1561         int rc1 = diskSeek512 (devUnitIdx, iomUnitIdx, chan);
1562         if (rc1) {
1563           rc = IOM_CMD_ERROR;
1564           goto done;
1565         }
1566       }
1567       break;
1568 
1569     case disk_wr: {
1570 #if defined(POLTS_DISK_TESTING)
1571 if (chan == 014)
1572 #endif
1573         if_sim_debug (DBG_TRACE, & dsk_dev) {
1574           sim_printf ("// Disk IOT Write\r\n");
1575         }
1576         int rc1 = diskWrite (devUnitIdx, iomUnitIdx, chan);
1577         if (rc1) {
1578           rc = IOM_CMD_ERROR;
1579           goto done;
1580         }
1581       }
1582       break;
1583 
1584     case disk_seek_64: {
1585 #if defined(POLTS_DISK_TESTING)
1586 if (chan == 014)
1587 #endif
1588         if_sim_debug (DBG_TRACE, & dsk_dev) {
1589           sim_printf ("// Disk IOT Seek 64\r\n");
1590         }
1591         int rc1 = diskSeek64 (devUnitIdx, iomUnitIdx, chan);
1592         if (rc1) {
1593           rc = IOM_CMD_ERROR;
1594           goto done;
1595         }
1596       }
1597       break;
1598 
1599     case disk_special_seek: { // Make it work like SEEK_64 and hope for the best
1600 #if defined(POLTS_DISK_TESTING)
1601 if (chan == 014)
1602 #endif
1603         if_sim_debug (DBG_TRACE, & dsk_dev) {
1604           sim_printf ("// Disk IOT special seek\r\n");
1605         }
1606         iom_cmd_rc_t rc1 = diskSeekSpecial (devUnitIdx, iomUnitIdx, chan);
1607         if (rc1) {
1608           rc = IOM_CMD_ERROR;
1609           goto done;
1610         }
1611       }
1612       break;
1613   }
1614 
1615 done:
1616 #if defined(LOCKLESS)
1617   unlock_ptr (& dsk_states->dsk_lock); //-V619
1618 #endif
1619   return rc;
1620 }
1621 
1622 //////////
1623 //////////
1624 //////////
1625 ///
1626 /// IPC
1627 ///
1628 
1629 #define IPC_UNIT_IDX(uptr) ((uptr) - ipc_unit)
1630 #define N_IPC_UNITS 1 // default
1631 
1632 static struct ipc_state
1633   {
1634     char device_name[MAX_DEV_NAME_LEN];
1635   } ipc_states[N_IPC_UNITS_MAX];
1636 
1637 UNIT ipc_unit[N_IPC_UNITS_MAX] = {
1638 #if defined(NO_C_ELLIPSIS)
1639   { UDATA (NULL, 0, 0), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
1640   { UDATA (NULL, 0, 0), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
1641   { UDATA (NULL, 0, 0), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
1642   { UDATA (NULL, 0, 0), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
1643   { UDATA (NULL, 0, 0), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
1644   { UDATA (NULL, 0, 0), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
1645   { UDATA (NULL, 0, 0), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
1646   { UDATA (NULL, 0, 0), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
1647   { UDATA (NULL, 0, 0), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
1648   { UDATA (NULL, 0, 0), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
1649   { UDATA (NULL, 0, 0), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
1650   { UDATA (NULL, 0, 0), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
1651   { UDATA (NULL, 0, 0), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
1652   { UDATA (NULL, 0, 0), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
1653   { UDATA (NULL, 0, 0), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
1654   { UDATA (NULL, 0, 0), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL }
1655 #else
1656   [0 ... N_IPC_UNITS_MAX-1] = {
1657     UDATA (NULL, 0, 0), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL
1658   }
1659 #endif
1660 };
1661 
1662 static t_stat ipc_show_nunits (UNUSED FILE * st, UNUSED UNIT * uptr,
     /*  */
1663                                UNUSED int val, UNUSED const void * desc)
1664   {
1665     sim_printf("Number of IPC units in system is %d\n", ipc_dev.numunits);
1666     return SCPE_OK;
1667   }
1668 
1669 static t_stat ipc_set_nunits (UNUSED UNIT * uptr, UNUSED int32 value,
     /*  */
1670                               const char * cptr, UNUSED void * desc)
1671   {
1672     if (! cptr)
1673       return SCPE_ARG;
1674     int n = atoi (cptr);
1675     if (n < 0 || n > N_DSK_UNITS_MAX)
1676       return SCPE_ARG;
1677     ipc_dev.numunits = (uint32) n;
1678     return SCPE_OK;
1679   }
1680 
1681 static t_stat ipc_show_device_name (UNUSED FILE * st, UNIT * uptr,
     /*  */
1682                                     UNUSED int val, UNUSED const void * desc)
1683   {
1684     int n = (int) IPC_UNIT_IDX (uptr);
1685     if (n < 0 || n >= N_IPC_UNITS_MAX)
1686       return SCPE_ARG;
1687     if (ipc_states[n].device_name[0] != 0)
1688       sim_printf("name     : %s", ipc_states[n].device_name);
1689     else
1690       sim_printf("name     : default");
1691     return SCPE_OK;
1692   }
1693 
1694 static t_stat ipc_set_device_name (UNIT * uptr, UNUSED int32 value,
     /*  */
1695                                    const char * cptr, UNUSED void * desc)
1696   {
1697     int n = (int) IPC_UNIT_IDX (uptr);
1698     if (n < 0 || n >= N_IPC_UNITS_MAX)
1699       return SCPE_ARG;
1700     if (cptr)
1701       {
1702         strncpy (ipc_states[n].device_name, cptr, MAX_DEV_NAME_LEN-1);
1703         ipc_states[n].device_name[MAX_DEV_NAME_LEN-1] = 0;
1704       }
1705     else
1706       ipc_states[n].device_name[0] = 0;
1707     return SCPE_OK;
1708   }
1709 
1710 static MTAB ipc_mod[] =
1711   {
1712     {
1713       MTAB_dev_value,                            /* Mask               */
1714       0,                                         /* Match              */
1715       "NUNITS",                                  /* Print string       */
1716       "NUNITS",                                  /* Match string       */
1717       ipc_set_nunits,                            /* Validation routine */
1718       ipc_show_nunits,                           /* Display routine    */
1719       "Number of DISK units in the system",      /* Value descriptor   */
1720       NULL                                       /* Help               */
1721     },
1722     {
1723       MTAB_XTD | MTAB_VUN | MTAB_VALR | MTAB_NC, /* Mask               */
1724       0,                                         /* Match              */
1725       "NAME",                                    /* Print string       */
1726       "NAME",                                    /* Match string       */
1727       ipc_set_device_name,                       /* Validation routine */
1728       ipc_show_device_name,                      /* Display routine    */
1729       "Set the device name",                     /* Value descriptor   */
1730       NULL                                       /* Help               */
1731     },
1732     MTAB_eol
1733   };
1734 
1735 DEVICE ipc_dev =
1736    {
1737     "IPC",                 /* Name                */
1738     ipc_unit,              /* Units               */
1739     NULL,                  /* Registers           */
1740     ipc_mod,               /* Modifiers           */
1741     N_IPC_UNITS,           /* #Units              */
1742     10,                    /* Address radix       */
1743     24,                    /* Address width       */
1744     1,                     /* Address increment   */
1745     8,                     /* Data radix          */
1746     36,                    /* Data width          */
1747     NULL,                  /* Examine             */
1748     NULL,                  /* Deposit             */
1749     NULL,                  /* Reset               */
1750     NULL,                  /* Boot                */
1751     NULL,                  /* Attach              */
1752     NULL /*disk_detach*/,  /* Detach              */
1753     NULL,                  /* Context             */
1754     0,                     /* Flags               */
1755     0,                     /* Debug control flags */
1756     NULL,                  /* Debug flag names    */
1757     NULL,                  /* Memory size change  */
1758     NULL,                  /* Logical name        */
1759     NULL,                  /* Help                */
1760     NULL,                  /* Attach help         */
1761     NULL,                  /* Attach context      */
1762     NULL,                  /* Description         */
1763     NULL                   /* End                 */
1764   };
1765 
1766 //////////
1767 //////////
1768 //////////
1769 ///
1770 /// MSP
1771 ///
1772 
1773 #define MSP_UNIT_IDX(uptr) ((uptr) - msp_unit)
1774 #define N_MSP_UNITS 1 // default
1775 
1776 struct msp_state_s msp_states [N_MSP_UNITS_MAX];
1777 
1778 UNIT msp_unit[N_MSP_UNITS_MAX] =
1779   {
1780 #if defined(NO_C_ELLIPSIS)
1781   { UDATA (NULL, 0, 0), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
1782   { UDATA (NULL, 0, 0), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
1783   { UDATA (NULL, 0, 0), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
1784   { UDATA (NULL, 0, 0), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
1785   { UDATA (NULL, 0, 0), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
1786   { UDATA (NULL, 0, 0), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
1787   { UDATA (NULL, 0, 0), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
1788   { UDATA (NULL, 0, 0), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
1789   { UDATA (NULL, 0, 0), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
1790   { UDATA (NULL, 0, 0), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
1791   { UDATA (NULL, 0, 0), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
1792   { UDATA (NULL, 0, 0), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
1793   { UDATA (NULL, 0, 0), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
1794   { UDATA (NULL, 0, 0), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
1795   { UDATA (NULL, 0, 0), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL },
1796   { UDATA (NULL, 0, 0), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL }
1797 #else
1798   [0 ... N_MSP_UNITS_MAX-1] = {
1799     UDATA (NULL, 0, 0), 0, 0, 0, 0, 0, NULL, NULL, NULL, NULL
1800   }
1801 #endif
1802 };
1803 
1804 static t_stat msp_show_nunits (UNUSED FILE * st, UNUSED UNIT * uptr,
     /*  */
1805                                UNUSED int val, UNUSED const void * desc)
1806   {
1807     sim_printf("Number of MSP units in system is %d\n", msp_dev.numunits);
1808     return SCPE_OK;
1809   }
1810 
1811 static t_stat msp_set_nunits (UNUSED UNIT * uptr, UNUSED int32 value,
     /*  */
1812                               const char * cptr, UNUSED void * desc)
1813   {
1814     if (! cptr)
1815       return SCPE_ARG;
1816     int n = atoi (cptr);
1817     if (n < 0 || n > N_DSK_UNITS_MAX)
1818       return SCPE_ARG;
1819     msp_dev.numunits = (uint32) n;
1820     return SCPE_OK;
1821   }
1822 
1823 static t_stat msp_show_device_name (UNUSED FILE * st, UNIT * uptr,
     /*  */
1824                                     UNUSED int val, UNUSED const void * desc)
1825   {
1826     int n = (int) MSP_UNIT_IDX (uptr);
1827     if (n < 0 || n >= N_MSP_UNITS_MAX)
1828       return SCPE_ARG;
1829     if (msp_states[n].device_name[0] != 0)
1830       sim_printf("name     : %s", msp_states[n].device_name);
1831     else
1832       sim_printf("name     : default");
1833     return SCPE_OK;
1834   }
1835 
1836 static t_stat msp_set_device_name (UNIT * uptr, UNUSED int32 value,
     /*  */
1837                                    const char * cptr, UNUSED void * desc)
1838   {
1839     int n = (int) MSP_UNIT_IDX (uptr);
1840     if (n < 0 || n >= N_MSP_UNITS_MAX)
1841       return SCPE_ARG;
1842     if (cptr)
1843       {
1844         strncpy (msp_states[n].device_name, cptr, MAX_DEV_NAME_LEN-1);
1845         msp_states[n].device_name[MAX_DEV_NAME_LEN-1] = 0;
1846       }
1847     else
1848       msp_states[n].device_name[0] = 0;
1849     return SCPE_OK;
1850   }
1851 
1852 static MTAB msp_mod[] =
1853   {
1854     {
1855       MTAB_dev_value,                        /* Mask               */
1856       0,                                     /* Match              */
1857       "NUNITS",                              /* Print string       */
1858       "NUNITS",                              /* Match string       */
1859       msp_set_nunits,                        /* Validation routine */
1860       msp_show_nunits,                       /* Display routine    */
1861       "Number of DISK units in the system",  /* Value descriptor   */
1862       NULL                                   /* Help               */
1863     },
1864     {
1865       MTAB_XTD | MTAB_VUN | \
1866       MTAB_VALR | MTAB_NC,                   /* Mask               */
1867       0,                                     /* Match              */
1868       "NAME",                                /* Print string       */
1869       "NAME",                                /* Match string       */
1870       msp_set_device_name,                   /* Validation routine */
1871       msp_show_device_name,                  /* Display routine    */
1872       "Set the device name",                 /* Value descriptor   */
1873       NULL                                   /* Help               */
1874     },
1875     MTAB_eol
1876   };
1877 
1878 DEVICE msp_dev =
1879    {
1880     "MSP",                 /* Name                */
1881     msp_unit,              /* Units               */
1882     NULL,                  /* Registers           */
1883     msp_mod,               /* Modifiers           */
1884     N_MSP_UNITS,           /* #Units              */
1885     10,                    /* Address radix       */
1886     24,                    /* Address width       */
1887     1,                     /* Address increment   */
1888     8,                     /* Data radix          */
1889     36,                    /* Data width          */
1890     NULL,                  /* Examine             */
1891     NULL,                  /* Deposit             */
1892     NULL,                  /* Reset               */
1893     NULL,                  /* Boot                */
1894     NULL,                  /* Attach              */
1895     NULL /*disk_detach*/,  /* Detach              */
1896     NULL,                  /* Context             */
1897     0,                     /* Flags               */
1898     0,                     /* Debug control flags */
1899     NULL,                  /* Debug flag names    */
1900     NULL,                  /* Memory size change  */
1901     NULL,                  /* Logical name        */
1902     NULL,                  /* Help                */
1903     NULL,                  /* Attach help         */
1904     NULL,                  /* Attach context      */
1905     NULL,                  /* Description         */
1906     NULL                   /* End                 */
1907   };
/* */
root/src/dps8/dps8_disk.c

DEFINITIONS
