| 1 | /* nova_dsk.c: 4019 fixed head disk simulator\r |
| 2 | \r |
| 3 | Copyright (c) 1993-2008, Robert M. Supnik\r |
| 4 | \r |
| 5 | Permission is hereby granted, free of charge, to any person obtaining a\r |
| 6 | copy of this software and associated documentation files (the "Software"),\r |
| 7 | to deal in the Software without restriction, including without limitation\r |
| 8 | the rights to use, copy, modify, merge, publish, distribute, sublicense,\r |
| 9 | and/or sell copies of the Software, and to permit persons to whom the\r |
| 10 | Software is furnished to do so, subject to the following conditions:\r |
| 11 | \r |
| 12 | The above copyright notice and this permission notice shall be included in\r |
| 13 | all copies or substantial portions of the Software.\r |
| 14 | \r |
| 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r |
| 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r |
| 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL\r |
| 18 | ROBERT M SUPNIK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER\r |
| 19 | IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN\r |
| 20 | CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.\r |
| 21 | \r |
| 22 | Except as contained in this notice, the name of Robert M Supnik shall not be\r |
| 23 | used in advertising or otherwise to promote the sale, use or other dealings\r |
| 24 | in this Software without prior written authorization from Robert M Supnik.\r |
| 25 | \r |
| 26 | dsk fixed head disk\r |
| 27 | \r |
| 28 | 04-Jul-07 BKR device name changed to DG's DSK from DEC's DK,\r |
| 29 | DEV_xxx macros now used for consistency,\r |
| 30 | added secret DG DIC function,\r |
| 31 | fixed boot info table size calculation\r |
| 32 | 15-May-06 RMS Fixed bug in autosize attach (reported by David Gesswein)\r |
| 33 | 04-Jan-04 RMS Changed sim_fsize calling sequence\r |
| 34 | 26-Jul-03 RMS Fixed bug in set size routine\r |
| 35 | 14-Mar-03 RMS Fixed variable capacity interaction with save/restore\r |
| 36 | 03-Mar-03 RMS Fixed variable capacity and autosizing\r |
| 37 | 03-Oct-02 RMS Added DIB\r |
| 38 | 06-Jan-02 RMS Revised enable/disable support\r |
| 39 | 23-Aug-01 RMS Fixed bug in write watermarking\r |
| 40 | 26-Apr-01 RMS Added device enable/disable support\r |
| 41 | 10-Dec-00 RMS Added Eclipse support\r |
| 42 | 15-Oct-00 RMS Editorial changes\r |
| 43 | 14-Apr-99 RMS Changed t_addr to unsigned\r |
| 44 | \r |
| 45 | The 4019 is a head-per-track disk. To minimize overhead, the entire disk\r |
| 46 | is buffered in memory.\r |
| 47 | */\r |
| 48 | \r |
| 49 | #include "nova_defs.h"\r |
| 50 | #include <math.h>\r |
| 51 | \r |
| 52 | #define UNIT_V_AUTO (UNIT_V_UF + 0) /* autosize */\r |
| 53 | #define UNIT_V_PLAT (UNIT_V_UF + 1) /* #platters - 1 */\r |
| 54 | #define UNIT_M_PLAT 07\r |
| 55 | #define UNIT_PLAT (UNIT_M_PLAT << UNIT_V_PLAT)\r |
| 56 | #define UNIT_GETP(x) ((((x) >> UNIT_V_PLAT) & UNIT_M_PLAT) + 1)\r |
| 57 | #define UNIT_AUTO (1 << UNIT_V_AUTO)\r |
| 58 | #define UNIT_PLAT (UNIT_M_PLAT << UNIT_V_PLAT)\r |
| 59 | \r |
| 60 | /* Constants */\r |
| 61 | \r |
| 62 | #define DSK_NUMWD 256 /* words/sector */\r |
| 63 | #define DSK_NUMSC 8 /* sectors/track */\r |
| 64 | #define DSK_NUMTR 128 /* tracks/disk */\r |
| 65 | #define DSK_DKSIZE (DSK_NUMTR*DSK_NUMSC*DSK_NUMWD) /* words/disk */\r |
| 66 | #define DSK_AMASK ((DSK_NUMDK*DSK_NUMTR*DSK_NUMSC) - 1)\r |
| 67 | /* address mask */\r |
| 68 | #define DSK_NUMDK 8 /* disks/controller */\r |
| 69 | #define GET_DISK(x) (((x) / (DSK_NUMSC * DSK_NUMTR)) & (DSK_NUMDK - 1))\r |
| 70 | \r |
| 71 | /* Parameters in the unit descriptor */\r |
| 72 | \r |
| 73 | #define FUNC u4 /* function */\r |
| 74 | \r |
| 75 | /* Status register */\r |
| 76 | \r |
| 77 | #define DSKS_WLS 020 /* write lock status */\r |
| 78 | #define DSKS_DLT 010 /* data late error */\r |
| 79 | #define DSKS_NSD 004 /* non-existent disk */\r |
| 80 | #define DSKS_CRC 002 /* parity error */\r |
| 81 | #define DSKS_ERR 001 /* error summary */\r |
| 82 | #define DSKS_ALLERR (DSKS_WLS | DSKS_DLT | DSKS_NSD | DSKS_CRC | DSKS_ERR)\r |
| 83 | \r |
| 84 | /* Map logical sector numbers to physical sector numbers\r |
| 85 | (indexed by track<2:0>'sector)\r |
| 86 | */\r |
| 87 | \r |
| 88 | static const int32 sector_map[] = {\r |
| 89 | 0, 2, 4, 6, 1, 3, 5, 7, 1, 3, 5, 7, 2, 4, 6, 0,\r |
| 90 | 2, 4, 6, 0, 3, 5, 7, 1, 3, 5, 7, 1, 4, 6, 0, 2,\r |
| 91 | 4, 6, 0, 2, 5, 7, 1, 3, 5, 7, 1, 3, 6, 0, 2, 4,\r |
| 92 | 6, 0, 2, 4, 7, 1, 3, 5, 7, 1, 3, 5, 0, 2, 4, 6\r |
| 93 | };\r |
| 94 | \r |
| 95 | #define DSK_MMASK 077\r |
| 96 | #define GET_SECTOR(x) ((int) fmod (sim_gtime() / ((double) (x)), \\r |
| 97 | ((double) DSK_NUMSC)))\r |
| 98 | \r |
| 99 | extern uint16 M[];\r |
| 100 | extern UNIT cpu_unit;\r |
| 101 | extern int32 int_req, dev_busy, dev_done, dev_disable;\r |
| 102 | extern int32 saved_PC, SR, AMASK;\r |
| 103 | \r |
| 104 | int32 dsk_stat = 0; /* status register */\r |
| 105 | int32 dsk_da = 0; /* disk address */\r |
| 106 | int32 dsk_ma = 0; /* memory address */\r |
| 107 | int32 dsk_wlk = 0; /* wrt lock switches */\r |
| 108 | int32 dsk_stopioe = 0; /* stop on error */\r |
| 109 | int32 dsk_time = 100; /* time per sector */\r |
| 110 | \r |
| 111 | DEVICE dsk_dev;\r |
| 112 | int32 dsk (int32 pulse, int32 code, int32 AC);\r |
| 113 | t_stat dsk_svc (UNIT *uptr);\r |
| 114 | t_stat dsk_reset (DEVICE *dptr);\r |
| 115 | t_stat dsk_boot (int32 unitno, DEVICE *dptr);\r |
| 116 | t_stat dsk_attach (UNIT *uptr, char *cptr);\r |
| 117 | t_stat dsk_set_size (UNIT *uptr, int32 val, char *cptr, void *desc);\r |
| 118 | \r |
| 119 | /* DSK data structures\r |
| 120 | \r |
| 121 | dsk_dev device descriptor\r |
| 122 | dsk_unit unit descriptor\r |
| 123 | dsk_reg register list\r |
| 124 | */\r |
| 125 | \r |
| 126 | DIB dsk_dib = { DEV_DSK, INT_DSK, PI_DSK, &dsk };\r |
| 127 | \r |
| 128 | UNIT dsk_unit = {\r |
| 129 | UDATA (&dsk_svc, UNIT_FIX+UNIT_ATTABLE+UNIT_BUFABLE+UNIT_MUSTBUF,\r |
| 130 | DSK_DKSIZE)\r |
| 131 | };\r |
| 132 | \r |
| 133 | REG dsk_reg[] = {\r |
| 134 | { ORDATA (STAT, dsk_stat, 16) },\r |
| 135 | { ORDATA (DA, dsk_da, 16) },\r |
| 136 | { ORDATA (MA, dsk_ma, 16) },\r |
| 137 | { FLDATA (BUSY, dev_busy, INT_V_DSK) },\r |
| 138 | { FLDATA (DONE, dev_done, INT_V_DSK) },\r |
| 139 | { FLDATA (DISABLE, dev_disable, INT_V_DSK) },\r |
| 140 | { FLDATA (INT, int_req, INT_V_DSK) },\r |
| 141 | { ORDATA (WLK, dsk_wlk, 8) },\r |
| 142 | { DRDATA (TIME, dsk_time, 24), REG_NZ + PV_LEFT },\r |
| 143 | { FLDATA (STOP_IOE, dsk_stopioe, 0) },\r |
| 144 | { NULL }\r |
| 145 | };\r |
| 146 | \r |
| 147 | MTAB dsk_mod[] = {\r |
| 148 | { UNIT_PLAT, (0 << UNIT_V_PLAT), NULL, "1P", &dsk_set_size },\r |
| 149 | { UNIT_PLAT, (1 << UNIT_V_PLAT), NULL, "2P", &dsk_set_size },\r |
| 150 | { UNIT_PLAT, (2 << UNIT_V_PLAT), NULL, "3P", &dsk_set_size },\r |
| 151 | { UNIT_PLAT, (3 << UNIT_V_PLAT), NULL, "4P", &dsk_set_size },\r |
| 152 | { UNIT_PLAT, (4 << UNIT_V_PLAT), NULL, "5P", &dsk_set_size },\r |
| 153 | { UNIT_PLAT, (5 << UNIT_V_PLAT), NULL, "6P", &dsk_set_size },\r |
| 154 | { UNIT_PLAT, (6 << UNIT_V_PLAT), NULL, "7P", &dsk_set_size },\r |
| 155 | { UNIT_PLAT, (7 << UNIT_V_PLAT), NULL, "8P", &dsk_set_size },\r |
| 156 | { UNIT_AUTO, UNIT_AUTO, "autosize", "AUTOSIZE", NULL },\r |
| 157 | { 0 }\r |
| 158 | };\r |
| 159 | \r |
| 160 | DEVICE dsk_dev = {\r |
| 161 | "DSK", &dsk_unit, dsk_reg, dsk_mod,\r |
| 162 | 1, 8, 21, 1, 8, 16,\r |
| 163 | NULL, NULL, &dsk_reset,\r |
| 164 | &dsk_boot, &dsk_attach, NULL,\r |
| 165 | &dsk_dib, DEV_DISABLE\r |
| 166 | };\r |
| 167 | \r |
| 168 | \r |
| 169 | /* IOT routine */\r |
| 170 | \r |
| 171 | int32 dsk (int32 pulse, int32 code, int32 AC)\r |
| 172 | {\r |
| 173 | int32 t, rval;\r |
| 174 | \r |
| 175 | rval = 0;\r |
| 176 | switch (code) { /* decode IR<5:7> */\r |
| 177 | \r |
| 178 | case ioDIA: /* DIA */\r |
| 179 | rval = dsk_stat & DSKS_ALLERR; /* read status */\r |
| 180 | break;\r |
| 181 | \r |
| 182 | case ioDOA: /* DOA */\r |
| 183 | dsk_da = AC & DSK_AMASK; /* save disk addr */\r |
| 184 | break;\r |
| 185 | \r |
| 186 | case ioDIB: /* DIB */\r |
| 187 | rval = dsk_ma & AMASK; /* read mem addr */\r |
| 188 | break;\r |
| 189 | \r |
| 190 | case ioDOB: /* DOB */\r |
| 191 | dsk_ma = AC & AMASK; /* save mem addr */\r |
| 192 | break;\r |
| 193 | \r |
| 194 | case ioDIC: /* DIC - undocumented DG feature(!) */\r |
| 195 | rval = 256 ; /* return fixed sector size for DG for now */\r |
| 196 | break ;\r |
| 197 | } /* end switch code */\r |
| 198 | \r |
| 199 | if (pulse) { /* any pulse? */\r |
| 200 | DEV_CLR_BUSY( INT_DSK ) ;\r |
| 201 | DEV_CLR_DONE( INT_DSK ) ;\r |
| 202 | DEV_UPDATE_INTR ;\r |
| 203 | dsk_stat = 0; /* clear status */\r |
| 204 | sim_cancel (&dsk_unit); /* stop I/O */\r |
| 205 | }\r |
| 206 | \r |
| 207 | if ((pulse == iopP) && ((dsk_wlk >> GET_DISK (dsk_da)) & 1)) { /* wrt lock? */\r |
| 208 | DEV_SET_DONE( INT_DSK ) ;\r |
| 209 | DEV_UPDATE_INTR ;\r |
| 210 | dsk_stat = DSKS_ERR + DSKS_WLS; /* set status */\r |
| 211 | return rval;\r |
| 212 | }\r |
| 213 | \r |
| 214 | if (pulse & 1) { /* read or write? */\r |
| 215 | if (((uint32) (dsk_da * DSK_NUMWD)) >= dsk_unit.capac) { /* inv sev? */\r |
| 216 | DEV_SET_DONE( INT_DSK ) ;\r |
| 217 | DEV_UPDATE_INTR ;\r |
| 218 | dsk_stat = DSKS_ERR + DSKS_NSD; /* set status */\r |
| 219 | return rval; /* done */\r |
| 220 | }\r |
| 221 | dsk_unit.FUNC = pulse; /* save command */\r |
| 222 | DEV_SET_BUSY( INT_DSK ) ;\r |
| 223 | DEV_UPDATE_INTR ;\r |
| 224 | t = sector_map[dsk_da & DSK_MMASK] - GET_SECTOR (dsk_time);\r |
| 225 | if (t < 0) t = t + DSK_NUMSC;\r |
| 226 | sim_activate (&dsk_unit, t * dsk_time); /* activate */\r |
| 227 | }\r |
| 228 | return rval;\r |
| 229 | }\r |
| 230 | \r |
| 231 | \r |
| 232 | /* Unit service */\r |
| 233 | \r |
| 234 | t_stat dsk_svc (UNIT *uptr)\r |
| 235 | {\r |
| 236 | int32 i, da, pa;\r |
| 237 | int16 *fbuf = uptr->filebuf;\r |
| 238 | \r |
| 239 | DEV_CLR_BUSY( INT_DSK ) ;\r |
| 240 | DEV_SET_DONE( INT_DSK ) ;\r |
| 241 | DEV_UPDATE_INTR ;\r |
| 242 | \r |
| 243 | if ((uptr->flags & UNIT_BUF) == 0) { /* not buf? abort */\r |
| 244 | dsk_stat = DSKS_ERR + DSKS_NSD; /* set status */\r |
| 245 | return IORETURN (dsk_stopioe, SCPE_UNATT);\r |
| 246 | }\r |
| 247 | \r |
| 248 | da = dsk_da * DSK_NUMWD; /* calc disk addr */\r |
| 249 | if (uptr->FUNC == iopS) { /* read? */\r |
| 250 | for (i = 0; i < DSK_NUMWD; i++) { /* copy sector */\r |
| 251 | pa = MapAddr (0, (dsk_ma + i) & AMASK); /* map address */\r |
| 252 | if (MEM_ADDR_OK (pa)) M[pa] = fbuf[da + i];\r |
| 253 | }\r |
| 254 | dsk_ma = (dsk_ma + DSK_NUMWD) & AMASK;\r |
| 255 | }\r |
| 256 | else if (uptr->FUNC == iopP) { /* write? */\r |
| 257 | for (i = 0; i < DSK_NUMWD; i++) { /* copy sector */\r |
| 258 | pa = MapAddr (0, (dsk_ma + i) & AMASK); /* map address */\r |
| 259 | fbuf[da + i] = M[pa];\r |
| 260 | }\r |
| 261 | if (((uint32) (da + i)) >= uptr->hwmark) /* past end? */\r |
| 262 | uptr->hwmark = da + i + 1; /* upd hwmark */\r |
| 263 | dsk_ma = (dsk_ma + DSK_NUMWD + 3) & AMASK;\r |
| 264 | }\r |
| 265 | \r |
| 266 | dsk_stat = 0; /* set status */\r |
| 267 | return SCPE_OK;\r |
| 268 | }\r |
| 269 | \r |
| 270 | \r |
| 271 | /* Reset routine */\r |
| 272 | \r |
| 273 | t_stat dsk_reset (DEVICE *dptr)\r |
| 274 | {\r |
| 275 | dsk_stat = dsk_da = dsk_ma = 0;\r |
| 276 | DEV_CLR_BUSY( INT_DSK ) ;\r |
| 277 | DEV_CLR_DONE( INT_DSK ) ;\r |
| 278 | DEV_UPDATE_INTR ;\r |
| 279 | sim_cancel (&dsk_unit);\r |
| 280 | return SCPE_OK;\r |
| 281 | }\r |
| 282 | \r |
| 283 | \r |
| 284 | /* Bootstrap routine */\r |
| 285 | \r |
| 286 | #define BOOT_START 0375\r |
| 287 | #define BOOT_LEN (sizeof (boot_rom) / sizeof (int32))\r |
| 288 | \r |
| 289 | static const int32 boot_rom[] = {\r |
| 290 | 0062677 /* IORST ; reset the I/O system */\r |
| 291 | , 0060120 /* NIOS DSK ; start the disk */\r |
| 292 | , 0000377 /* JMP 377 ; wait for the world */\r |
| 293 | } ;\r |
| 294 | \r |
| 295 | \r |
| 296 | t_stat dsk_boot (int32 unitno, DEVICE *dptr)\r |
| 297 | {\r |
| 298 | int32 i;\r |
| 299 | \r |
| 300 | for (i = 0; i < BOOT_LEN; i++) M[BOOT_START + i] = (uint16) boot_rom[i];\r |
| 301 | saved_PC = BOOT_START;\r |
| 302 | SR = 0100000 + DEV_DSK;\r |
| 303 | return SCPE_OK;\r |
| 304 | }\r |
| 305 | \r |
| 306 | \r |
| 307 | /* Attach routine */\r |
| 308 | \r |
| 309 | t_stat dsk_attach (UNIT *uptr, char *cptr)\r |
| 310 | {\r |
| 311 | uint32 sz, p;\r |
| 312 | uint32 ds_bytes = DSK_DKSIZE * sizeof (int16);\r |
| 313 | \r |
| 314 | if ((uptr->flags & UNIT_AUTO) && (sz = sim_fsize_name (cptr))) {\r |
| 315 | p = (sz + ds_bytes - 1) / ds_bytes;\r |
| 316 | if (p >= DSK_NUMDK) p = DSK_NUMDK - 1;\r |
| 317 | uptr->flags = (uptr->flags & ~UNIT_PLAT) | (p << UNIT_V_PLAT);\r |
| 318 | }\r |
| 319 | uptr->capac = UNIT_GETP (uptr->flags) * DSK_DKSIZE; /* set capacity */\r |
| 320 | return attach_unit (uptr, cptr);\r |
| 321 | }\r |
| 322 | \r |
| 323 | \r |
| 324 | /* Change disk size */\r |
| 325 | \r |
| 326 | t_stat dsk_set_size (UNIT *uptr, int32 val, char *cptr, void *desc)\r |
| 327 | {\r |
| 328 | if (val < 0) return SCPE_IERR;\r |
| 329 | if (uptr->flags & UNIT_ATT) return SCPE_ALATT;\r |
| 330 | uptr->capac = UNIT_GETP (val) * DSK_DKSIZE;\r |
| 331 | uptr->flags = uptr->flags & ~UNIT_AUTO;\r |
| 332 | return SCPE_OK;\r |
| 333 | }\r |