Initial tape and magneto-optical support
[SCSI2SD.git] / software / SCSI2SD / src / mode.c
1 //      Copyright (C) 2013 Michael McMaster <michael@codesrc.com>\r
2 //  Copyright (C) 2014 Doug Brown <doug@downtowndougbrown.com>\r
3 //\r
4 //      This file is part of SCSI2SD.\r
5 //\r
6 //      SCSI2SD is free software: you can redistribute it and/or modify\r
7 //      it under the terms of the GNU General Public License as published by\r
8 //      the Free Software Foundation, either version 3 of the License, or\r
9 //      (at your option) any later version.\r
10 //\r
11 //      SCSI2SD is distributed in the hope that it will be useful,\r
12 //      but WITHOUT ANY WARRANTY; without even the implied warranty of\r
13 //      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
14 //      GNU General Public License for more details.\r
15 //\r
16 //      You should have received a copy of the GNU General Public License\r
17 //      along with SCSI2SD.  If not, see <http://www.gnu.org/licenses/>.\r
18 #pragma GCC push_options\r
19 #pragma GCC optimize("-flto")\r
20 \r
21 #include "device.h"\r
22 #include "scsi.h"\r
23 #include "mode.h"\r
24 #include "disk.h"\r
25 \r
26 #include <string.h>\r
27 \r
28 static const uint8 ReadWriteErrorRecoveryPage[] =\r
29 {\r
30 0x01, // Page code\r
31 0x0A, // Page length\r
32 \r
33 // VMS 5.5-2 is very particular regarding the mode page values.\r
34 // The required values for a SCSI2/NoTCQ device are:\r
35 // AWRE=0 ARRE=0 TB=1 RC=0 EER=? PER=1 DTE=1 DCR=?\r
36 // See ftp://www.digiater.nl/openvms/decus/vms94b/net94b/scsi_params_dkdriver.txt\r
37 // X-Newsgroups: comp.os.vms\r
38 // Subject: Re: VMS 6.1 vs. Seagate Disk Drives\r
39 // Message-Id: <32g87h$8q@nntpd.lkg.dec.com>\r
40 // From: weber@evms.enet.dec.com (Ralph O. Weber -- OpenVMS AXP)\r
41 // Date: 12 Aug 1994 16:32:49 GMT\r
42 0x26,\r
43 \r
44 0x00, // Don't try recovery algorithm during reads\r
45 0x00, // Correction span 0\r
46 0x00, // Head offset count 0,\r
47 0x00, // Data strobe offset count 0,\r
48 0x00, // Reserved\r
49 0x00, // Don't try recovery algorithm during writes\r
50 0x00, // Reserved\r
51 0x00, 0x00 // Recovery time limit 0 (use default)*/\r
52 };\r
53 \r
54 static const uint8 ReadWriteErrorRecoveryPage_SCSI1[] =\r
55 {\r
56 0x01, // Page code\r
57 0x06, // Page length\r
58 0x26,\r
59 0x00, // Don't try recovery algorithm during reads\r
60 0x00, // Correction span 0\r
61 0x00, // Head offset count 0,\r
62 0x00, // Data strobe offset count 0,\r
63 0xFF // Reserved\r
64 };\r
65 \r
66 static const uint8 DisconnectReconnectPage[] =\r
67 {\r
68 0x02, // Page code\r
69 0x0E, // Page length\r
70 0, // Buffer full ratio\r
71 0, // Buffer empty ratio\r
72 0x00, 10, // Bus inactivity limit, 100us increments. Allow 1ms.\r
73 0x00, 0x00, // Disconnect time limit\r
74 0x00, 0x00, // Connect time limit\r
75 0x00, 0x00, // Maximum burst size\r
76 0x00 ,// DTDC. Not used.\r
77 0x00, 0x00, 0x00 // Reserved\r
78 };\r
79 \r
80 static const uint8 DisconnectReconnectPage_SCSI1[] =\r
81 {\r
82 0x02, // Page code\r
83 0x0A, // Page length\r
84 0, // Buffer full ratio\r
85 0, // Buffer empty ratio\r
86 0x00, 10, // Bus inactivity limit, 100us increments. Allow 1ms.\r
87 0x00, 0x00, // Disconnect time limit\r
88 0x00, 0x00, // Connect time limit\r
89 0x00, 0x00 // Maximum burst size\r
90 };\r
91 \r
92 static const uint8 FormatDevicePage[] =\r
93 {\r
94 0x03 | 0x80, // Page code | PS (persist) bit.\r
95 0x16, // Page length\r
96 0x00, 0x00, // Single zone\r
97 0x00, 0x00, // No alternate sectors\r
98 0x00, 0x00, // No alternate tracks\r
99 0x00, 0x00, // No alternate tracks per lun\r
100 0x00, 0x00, // Sectors per track, configurable\r
101 0xFF, 0xFF, // Data bytes per physical sector. Configurable.\r
102 0x00, 0x01, // Interleave\r
103 0x00, 0x00, // Track skew factor\r
104 0x00, 0x00, // Cylinder skew factor\r
105 0xC0, // SSEC(set) HSEC(set) RMB SURF\r
106 0x00, 0x00, 0x00 // Reserved\r
107 };\r
108 \r
109 static const uint8 RigidDiskDriveGeometry[] =\r
110 {\r
111 0x04, // Page code\r
112 0x16, // Page length\r
113 0xFF, 0xFF, 0xFF, // Number of cylinders\r
114 0x00, // Number of heads (replaced by configured value)\r
115 0xFF, 0xFF, 0xFF, // Starting cylinder-write precompensation\r
116 0xFF, 0xFF, 0xFF, // Starting cylinder-reduced write current\r
117 0x00, 0x1, // Drive step rate (units of 100ns)\r
118 0x00, 0x00, 0x00, // Landing zone cylinder\r
119 0x00, // RPL\r
120 0x00, // Rotational offset\r
121 0x00, // Reserved\r
122 5400 >> 8, 5400 & 0xFF, // Medium rotation rate (RPM)\r
123 0x00, 0x00 // Reserved\r
124 };\r
125 \r
126 static const uint8 RigidDiskDriveGeometry_SCSI1[] =\r
127 {\r
128 0x04, // Page code\r
129 0x12, // Page length\r
130 0xFF, 0xFF, 0xFF, // Number of cylinders\r
131 0x00, // Number of heads (replaced by configured value)\r
132 0xFF, 0xFF, 0xFF, // Starting cylinder-write precompensation\r
133 0xFF, 0xFF, 0xFF, // Starting cylinder-reduced write current\r
134 0x00, 0x1, // Drive step rate (units of 100ns)\r
135 0x00, 0x00, 0x00, // Landing zone cylinder\r
136 0x00, // RPL\r
137 0x00, // Rotational offset\r
138 0x00 // Reserved\r
139 };\r
140 \r
141 static const uint8 CachingPage[] =\r
142 {\r
143 0x08, // Page Code\r
144 0x0A, // Page length\r
145 0x01, // Read cache disable\r
146 0x00, // No useful rention policy.\r
147 0x00, 0x00, // Pre-fetch always disabled\r
148 0x00, 0x00, // Minimum pre-fetch\r
149 0x00, 0x00, // Maximum pre-fetch\r
150 0x00, 0x00, // Maximum pre-fetch ceiling\r
151 };\r
152 \r
153 static const uint8 ControlModePage[] =\r
154 {\r
155 0x0A, // Page code\r
156 0x06, // Page length\r
157 0x00, // No logging\r
158 0x01, // Disable tagged queuing\r
159 0x00, // No async event notifications\r
160 0x00, // Reserved\r
161 0x00, 0x00 // AEN holdoff period.\r
162 };\r
163 \r
164 static const uint8_t SequentialDeviceConfigPage[] =\r
165 {\r
166 0x10, // page code\r
167 0x0E, // Page length\r
168 0x00, // CAP, CAF, Active Format\r
169 0x00, // Active partition\r
170 0x00, // Write buffer full ratio\r
171 0x00, // Read buffer empty ratio\r
172 0x00,0x01, // Write delay time, in 100ms units\r
173 0x00, // Default gap size\r
174 0x10, // auto-generation of default eod (end of data)\r
175 0x00,0x00,0x00 // buffer-size at early warning\r
176 0x00, // No data compression\r
177 0x00 // reserved\r
178 };\r
179 \r
180 // Allow Apple 68k Drive Setup to format this drive.\r
181 // Code\r
182 static const uint8 AppleVendorPage[] =\r
183 {\r
184 0x30, // Page code\r
185 28, // Page length\r
186 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,\r
187 'A','P','P','L','E',' ','C','O','M','P','U','T','E','R',',',' ','I','N','C','.'\r
188 };\r
189 \r
190 static void pageIn(int pc, int dataIdx, const uint8* pageData, int pageLen)\r
191 {\r
192         memcpy(&scsiDev.data[dataIdx], pageData, pageLen);\r
193 \r
194         if (pc == 0x01) // Mask out (un)changable values\r
195         {\r
196                 memset(&scsiDev.data[dataIdx+2], 0, pageLen - 2);\r
197         }\r
198 }\r
199 \r
200 static void doModeSense(\r
201         int sixByteCmd, int dbd, int pc, int pageCode, int allocLength)\r
202 {\r
203         ////////////// Mode Parameter Header\r
204         ////////////////////////////////////\r
205 \r
206         // Skip the Mode Data Length, we set that last.\r
207         int idx = 1;\r
208         if (!sixByteCmd) ++idx;\r
209 \r
210         uint8_t mediumType = 0;\r
211         uint8_t deviceSpecificParam = 0;\r
212         uint8_t density = 0;\r
213         switch (scsiDev.target->cfg->deviceType == CONFIG_OPTICAL)\r
214         {\r
215         case CONFIG_FIXED:\r
216         case CONFIG_REMOVEABLE:\r
217                 mediumType = 0; // We should support various floppy types here!\r
218                 // Contains cache bits (0) and a Write-Protect bit.\r
219                 deviceSpecificParam =\r
220                         (blockDev.state & DISK_WP) ? 0x80 : 0;\r
221                 density = 0; // reserved for direct access\r
222                 break;\r
223 \r
224         case CONFIG_FLOPPY_14MB:\r
225                 mediumType = 0x1E; // 90mm/3.5"\r
226                 deviceSpecificParam =\r
227                         (blockDev.state & DISK_WP) ? 0x80 : 0;\r
228                 density = 0; // reserved for direct access\r
229                 break;\r
230 \r
231         case CONFIG_OPTICAL:\r
232                 mediumType = 0x02; // 120mm CDROM, data only.\r
233                 deviceSpecificParam = 0;\r
234                 density = 0x01; // User data only, 2048bytes per sector.\r
235                 break;\r
236 \r
237         case CONFIG_SEQUENTIAL:\r
238                 mediumType = 0; // reserved\r
239                 deviceSpecificParam =\r
240                         (blockDev.state & DISK_WP) ? 0x80 : 0;\r
241                 density = 0x13; // DAT Data Storage, X3B5/88-185A \r
242                 break;\r
243 \r
244         case CONFIG_MO:\r
245                 TODO\r
246                 break;\r
247 \r
248         };\r
249 \r
250         scsiDev.data[idx++] = mediumType;\r
251         scsiDev.data[idx++] = deviceSpecificParam;\r
252 \r
253         if (sixByteCmd)\r
254         {\r
255                 if (dbd)\r
256                 {\r
257                         scsiDev.data[idx++] = 0; // No block descriptor\r
258                 }\r
259                 else\r
260                 {\r
261                         // One block descriptor of length 8 bytes.\r
262                         scsiDev.data[idx++] = 8;\r
263                 }\r
264         }\r
265         else\r
266         {\r
267                 scsiDev.data[idx++] = 0; // Reserved\r
268                 scsiDev.data[idx++] = 0; // Reserved\r
269                 if (dbd)\r
270                 {\r
271                         scsiDev.data[idx++] = 0; // No block descriptor\r
272                         scsiDev.data[idx++] = 0; // No block descriptor\r
273                 }\r
274                 else\r
275                 {\r
276                         // One block descriptor of length 8 bytes.\r
277                         scsiDev.data[idx++] = 0;\r
278                         scsiDev.data[idx++] = 8;\r
279                 }\r
280         }\r
281 \r
282         ////////////// Block Descriptor\r
283         ////////////////////////////////////\r
284         if (!dbd)\r
285         {\r
286                 scsiDev.data[idx++] = density;\r
287                 // Number of blocks\r
288                 // Zero == all remaining blocks shall have the medium\r
289                 // characteristics specified.\r
290                 scsiDev.data[idx++] = 0;\r
291                 scsiDev.data[idx++] = 0;\r
292                 scsiDev.data[idx++] = 0;\r
293 \r
294                 scsiDev.data[idx++] = 0; // reserved\r
295 \r
296                 // Block length\r
297                 uint32_t bytesPerSector = scsiDev.target->liveCfg.bytesPerSector;\r
298                 scsiDev.data[idx++] = bytesPerSector >> 16;\r
299                 scsiDev.data[idx++] = bytesPerSector >> 8;\r
300                 scsiDev.data[idx++] = bytesPerSector & 0xFF;\r
301         }\r
302 \r
303         int pageFound = 0;\r
304 \r
305         if (pageCode == 0x01 || pageCode == 0x3F)\r
306         {\r
307                 pageFound = 1;\r
308                 if ((scsiDev.compatMode >= COMPAT_SCSI2))\r
309                 {\r
310                         pageIn(pc, idx, ReadWriteErrorRecoveryPage, sizeof(ReadWriteErrorRecoveryPage));\r
311                         idx += sizeof(ReadWriteErrorRecoveryPage);\r
312                 }\r
313                 else\r
314                 {\r
315                         pageIn(pc, idx, ReadWriteErrorRecoveryPage_SCSI1, sizeof(ReadWriteErrorRecoveryPage_SCSI1));\r
316                         idx += sizeof(ReadWriteErrorRecoveryPage_SCSI1);\r
317                 }\r
318         }\r
319 \r
320         if (pageCode == 0x02 || pageCode == 0x3F)\r
321         {\r
322                 pageFound = 1;\r
323                 if ((scsiDev.compatMode >= COMPAT_SCSI2))\r
324                 {\r
325                         pageIn(pc, idx, DisconnectReconnectPage, sizeof(DisconnectReconnectPage));\r
326                         idx += sizeof(DisconnectReconnectPage);\r
327                 }\r
328                 else\r
329                 {\r
330                         pageIn(pc, idx, DisconnectReconnectPage_SCSI1, sizeof(DisconnectReconnectPage_SCSI1));\r
331                         idx += sizeof(DisconnectReconnectPage_SCSI1);\r
332                 }\r
333         }\r
334 \r
335         if (pageCode == 0x03 || pageCode == 0x3F)\r
336         {\r
337                 pageFound = 1;\r
338                 pageIn(pc, idx, FormatDevicePage, sizeof(FormatDevicePage));\r
339                 if (pc != 0x01)\r
340                 {\r
341                         uint16_t sectorsPerTrack = scsiDev.target->cfg->sectorsPerTrack;\r
342                         scsiDev.data[idx+10] = sectorsPerTrack >> 8;\r
343                         scsiDev.data[idx+11] = sectorsPerTrack & 0xFF;\r
344 \r
345                         // Fill out the configured bytes-per-sector\r
346                         uint32_t bytesPerSector = scsiDev.target->liveCfg.bytesPerSector;\r
347                         scsiDev.data[idx+12] = bytesPerSector >> 8;\r
348                         scsiDev.data[idx+13] = bytesPerSector & 0xFF;\r
349                 }\r
350                 else\r
351                 {\r
352                         // Set a mask for the changeable values.\r
353                         scsiDev.data[idx+12] = 0xFF;\r
354                         scsiDev.data[idx+13] = 0xFF;\r
355                 }\r
356 \r
357                 idx += sizeof(FormatDevicePage);\r
358         }\r
359 \r
360         if (pageCode == 0x04 || pageCode == 0x3F)\r
361         {\r
362                 pageFound = 1;\r
363                 if ((scsiDev.compatMode >= COMPAT_SCSI2))\r
364                 {\r
365                         pageIn(pc, idx, RigidDiskDriveGeometry, sizeof(RigidDiskDriveGeometry));\r
366                 }\r
367                 else\r
368                 {\r
369                         pageIn(pc, idx, RigidDiskDriveGeometry_SCSI1, sizeof(RigidDiskDriveGeometry_SCSI1));\r
370                 }\r
371 \r
372                 if (pc != 0x01)\r
373                 {\r
374                         // Need to fill out the number of cylinders.\r
375                         uint32 cyl;\r
376                         uint8 head;\r
377                         uint32 sector;\r
378                         LBA2CHS(\r
379                                 getScsiCapacity(\r
380                                         scsiDev.target->cfg->sdSectorStart,\r
381                                         scsiDev.target->liveCfg.bytesPerSector,\r
382                                         scsiDev.target->cfg->scsiSectors),\r
383                                 &cyl,\r
384                                 &head,\r
385                                 &sector,\r
386                                 scsiDev.target->cfg->headsPerCylinder,\r
387                                 scsiDev.target->cfg->sectorsPerTrack);\r
388 \r
389                         scsiDev.data[idx+2] = cyl >> 16;\r
390                         scsiDev.data[idx+3] = cyl >> 8;\r
391                         scsiDev.data[idx+4] = cyl;\r
392 \r
393                         memcpy(&scsiDev.data[idx+6], &scsiDev.data[idx+2], 3);\r
394                         memcpy(&scsiDev.data[idx+9], &scsiDev.data[idx+2], 3);\r
395 \r
396                         scsiDev.data[idx+5] = scsiDev.target->cfg->headsPerCylinder;\r
397                 }\r
398 \r
399                 if ((scsiDev.compatMode >= COMPAT_SCSI2))\r
400                 {\r
401                         idx += sizeof(RigidDiskDriveGeometry);\r
402                 }\r
403                 else\r
404                 {\r
405                         idx += sizeof(RigidDiskDriveGeometry_SCSI1);\r
406                 }\r
407         }\r
408 \r
409         // DON'T output the following pages for SCSI1 hosts. They get upset when\r
410         // we have more data to send than the allocation length provided.\r
411         // (ie. Try not to output any more pages below this comment)\r
412 \r
413 \r
414         if ((scsiDev.compatMode >= COMPAT_SCSI2) &&\r
415                 (pageCode == 0x08 || pageCode == 0x3F))\r
416         {\r
417                 pageFound = 1;\r
418                 pageIn(pc, idx, CachingPage, sizeof(CachingPage));\r
419                 idx += sizeof(CachingPage);\r
420         }\r
421 \r
422         if ((scsiDev.compatMode >= COMPAT_SCSI2)\r
423                 && (pageCode == 0x0A || pageCode == 0x3F))\r
424         {\r
425                 pageFound = 1;\r
426                 pageIn(pc, idx, ControlModePage, sizeof(ControlModePage));\r
427                 idx += sizeof(ControlModePage);\r
428         }\r
429 \r
430         if ((scsiDev.target->cfg->deviceType == CONFIG_SEQUENTIAL) &&\r
431                 (pageCode == 0x10 || pageCode == 0x3F))\r
432         {\r
433                 pageFound = 1;\r
434                 pageIn(\r
435                         pc,\r
436                         idx,\r
437                         SequentialDeviceConfigPage,\r
438                         sizeof(SequentialDeviceConfigPage));\r
439                 idx += sizeof(SequentialDeviceConfigPage);\r
440         }\r
441 \r
442         if ((\r
443                         (scsiDev.target->cfg->quirks == CONFIG_QUIRKS_APPLE) ||\r
444                         (idx + sizeof(AppleVendorPage) <= allocLength)\r
445                 ) &&\r
446                 (pageCode == 0x30 || pageCode == 0x3F))\r
447         {\r
448                 pageFound = 1;\r
449                 pageIn(pc, idx, AppleVendorPage, sizeof(AppleVendorPage));\r
450                 idx += sizeof(AppleVendorPage);\r
451         }\r
452 \r
453         if (!pageFound)\r
454         {\r
455                 // Unknown Page Code\r
456                 pageFound = 0;\r
457                 scsiDev.status = CHECK_CONDITION;\r
458                 scsiDev.target->sense.code = ILLEGAL_REQUEST;\r
459                 scsiDev.target->sense.asc = INVALID_FIELD_IN_CDB;\r
460                 scsiDev.phase = STATUS;\r
461         }\r
462         else\r
463         {\r
464                 // Go back and fill out the mode data length\r
465                 if (sixByteCmd)\r
466                 {\r
467                         // Cannot currently exceed limits. yay\r
468                         scsiDev.data[0] = idx - 1;\r
469                 }\r
470                 else\r
471                 {\r
472                         scsiDev.data[0] = ((idx - 2) >> 8);\r
473                         scsiDev.data[1] = (idx - 2);\r
474                 }\r
475 \r
476                 scsiDev.dataLen = idx > allocLength ? allocLength : idx;\r
477                 scsiDev.phase = DATA_IN;\r
478         }\r
479 }\r
480 \r
481 \r
482 // Callback after the DATA OUT phase is complete.\r
483 static void doModeSelect(void)\r
484 {\r
485         if (scsiDev.status == GOOD) // skip if we've already encountered an error\r
486         {\r
487                 // scsiDev.dataLen bytes are in scsiDev.data\r
488 \r
489                 int idx;\r
490                 int blockDescLen;\r
491                 if (scsiDev.cdb[0] == 0x55)\r
492                 {\r
493                         blockDescLen =\r
494                                 (((uint16_t)scsiDev.data[6]) << 8) |scsiDev.data[7];\r
495                         idx = 8;\r
496                 }\r
497                 else\r
498                 {\r
499                         blockDescLen = scsiDev.data[3];\r
500                         idx = 4;\r
501                 }\r
502 \r
503                 // The unwritten rule.  Blocksizes are normally set using the\r
504                 // block descriptor value, not by changing page 0x03.\r
505                 if (blockDescLen >= 8)\r
506                 {\r
507                         uint32_t bytesPerSector =\r
508                                 (((uint32_t)scsiDev.data[idx+5]) << 16) |\r
509                                 (((uint32_t)scsiDev.data[idx+6]) << 8) |\r
510                                 scsiDev.data[idx+7];\r
511                         if ((bytesPerSector < MIN_SECTOR_SIZE) ||\r
512                                 (bytesPerSector > MAX_SECTOR_SIZE))\r
513                         {\r
514                                 goto bad;\r
515                         }\r
516                         else\r
517                         {\r
518                                 scsiDev.target->liveCfg.bytesPerSector = bytesPerSector;\r
519                                 if (bytesPerSector != scsiDev.target->cfg->bytesPerSector)\r
520                                 {\r
521                                         configSave(scsiDev.target->targetId, bytesPerSector);\r
522                                 }\r
523                         }\r
524                 }\r
525                 idx += blockDescLen;\r
526 \r
527                 while (idx < scsiDev.dataLen)\r
528                 {\r
529                         int pageLen = scsiDev.data[idx + 1];\r
530                         if (idx + 2 + pageLen > scsiDev.dataLen) goto bad;\r
531 \r
532                         int pageCode = scsiDev.data[idx] & 0x3F;\r
533                         switch (pageCode)\r
534                         {\r
535                         case 0x03: // Format Device Page\r
536                         {\r
537                                 if (pageLen != 0x16) goto bad;\r
538 \r
539                                 // Fill out the configured bytes-per-sector\r
540                                 uint16_t bytesPerSector =\r
541                                         (((uint16_t)scsiDev.data[idx+12]) << 8) |\r
542                                         scsiDev.data[idx+13];\r
543 \r
544                                 // Sane values only, ok ?\r
545                                 if ((bytesPerSector < MIN_SECTOR_SIZE) ||\r
546                                         (bytesPerSector > MAX_SECTOR_SIZE))\r
547                                 {\r
548                                         goto bad;\r
549                                 }\r
550 \r
551                                 scsiDev.target->liveCfg.bytesPerSector = bytesPerSector;\r
552                                 if (scsiDev.cdb[1] & 1) // SP Save Pages flag\r
553                                 {\r
554                                         configSave(scsiDev.target->targetId, bytesPerSector);\r
555                                 }\r
556                         }\r
557                         break;\r
558                         //default:\r
559 \r
560                                 // Easiest to just ignore for now. We'll get here when changing\r
561                                 // the SCSI block size via the descriptor header.\r
562                         }\r
563                         idx += 2 + pageLen;\r
564                 }\r
565         }\r
566 \r
567         goto out;\r
568 bad:\r
569         scsiDev.status = CHECK_CONDITION;\r
570         scsiDev.target->sense.code = ILLEGAL_REQUEST;\r
571         scsiDev.target->sense.asc = INVALID_FIELD_IN_PARAMETER_LIST;\r
572 \r
573 out:\r
574         scsiDev.phase = STATUS;\r
575 }\r
576 \r
577 int scsiModeCommand()\r
578 {\r
579         int commandHandled = 1;\r
580 \r
581         uint8 command = scsiDev.cdb[0];\r
582 \r
583         // We don't currently support the setting of any parameters.\r
584         // (ie. no MODE SELECT(6) or MODE SELECT(10) commands)\r
585 \r
586         if (command == 0x1A)\r
587         {\r
588                 // MODE SENSE(6)\r
589                 int dbd = scsiDev.cdb[1] & 0x08; // Disable block descriptors\r
590                 int pc = scsiDev.cdb[2] >> 6; // Page Control\r
591                 int pageCode = scsiDev.cdb[2] & 0x3F;\r
592                 int allocLength = scsiDev.cdb[4];\r
593 \r
594                 // SCSI1 standard: (CCS X3T9.2/86-52)\r
595                 // "An Allocation Length of zero indicates that no MODE SENSE data shall\r
596                 // be transferred. This condition shall not be considered as an error."\r
597                 doModeSense(1, dbd, pc, pageCode, allocLength);\r
598         }\r
599         else if (command == 0x5A)\r
600         {\r
601                 // MODE SENSE(10)\r
602                 int dbd = scsiDev.cdb[1] & 0x08; // Disable block descriptors\r
603                 int pc = scsiDev.cdb[2] >> 6; // Page Control\r
604                 int pageCode = scsiDev.cdb[2] & 0x3F;\r
605                 int allocLength =\r
606                         (((uint16) scsiDev.cdb[7]) << 8) +\r
607                         scsiDev.cdb[8];\r
608                 doModeSense(0, dbd, pc, pageCode, allocLength);\r
609         }\r
610         else if (command == 0x15)\r
611         {\r
612                 // MODE SELECT(6)\r
613                 int len = scsiDev.cdb[4];\r
614                 if (len == 0)\r
615                 {\r
616                         // If len == 0, then transfer no data. From the SCSI 2 standard:\r
617                         //      A parameter list length of zero indicates that no data shall\r
618                         //      be transferred. This condition shall not be considered as an\r
619                         //              error.\r
620                         scsiDev.phase = STATUS;\r
621                 }\r
622                 else\r
623                 {\r
624                         scsiDev.dataLen = len;\r
625                         scsiDev.phase = DATA_OUT;\r
626                         scsiDev.postDataOutHook = doModeSelect;\r
627                 }\r
628         }\r
629         else if (command == 0x55)\r
630         {\r
631                 // MODE SELECT(10)\r
632                 int allocLength = (((uint16) scsiDev.cdb[7]) << 8) + scsiDev.cdb[8];\r
633                 if (allocLength == 0)\r
634                 {\r
635                         // If len == 0, then transfer no data. From the SCSI 2 standard:\r
636                         //      A parameter list length of zero indicates that no data shall\r
637                         //      be transferred. This condition shall not be considered as an\r
638                         //              error.\r
639                         scsiDev.phase = STATUS;\r
640                 }\r
641                 else\r
642                 {\r
643                         scsiDev.dataLen = allocLength;\r
644                         scsiDev.phase = DATA_OUT;\r
645                         scsiDev.postDataOutHook = doModeSelect;\r
646                 }\r
647         }\r
648         else\r
649         {\r
650                 commandHandled = 0;\r
651         }\r
652 \r
653         return commandHandled;\r
654 }\r
655 \r
656 #pragma GCC pop_options\r