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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 |