b5551d12adebe2f58f679362aa753afd9af68844
[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         mediumType = 0x03; // Optical reversible or erasable medium\r
246                 deviceSpecificParam =\r
247                         (blockDev.state & DISK_WP) ? 0x80 : 0;\r
248                 density = 0x00; // Default\r
249                 break;\r
250 \r
251         };\r
252 \r
253         scsiDev.data[idx++] = mediumType;\r
254         scsiDev.data[idx++] = deviceSpecificParam;\r
255 \r
256         if (sixByteCmd)\r
257         {\r
258                 if (dbd)\r
259                 {\r
260                         scsiDev.data[idx++] = 0; // No block descriptor\r
261                 }\r
262                 else\r
263                 {\r
264                         // One block descriptor of length 8 bytes.\r
265                         scsiDev.data[idx++] = 8;\r
266                 }\r
267         }\r
268         else\r
269         {\r
270                 scsiDev.data[idx++] = 0; // Reserved\r
271                 scsiDev.data[idx++] = 0; // Reserved\r
272                 if (dbd)\r
273                 {\r
274                         scsiDev.data[idx++] = 0; // No block descriptor\r
275                         scsiDev.data[idx++] = 0; // No block descriptor\r
276                 }\r
277                 else\r
278                 {\r
279                         // One block descriptor of length 8 bytes.\r
280                         scsiDev.data[idx++] = 0;\r
281                         scsiDev.data[idx++] = 8;\r
282                 }\r
283         }\r
284 \r
285         ////////////// Block Descriptor\r
286         ////////////////////////////////////\r
287         if (!dbd)\r
288         {\r
289                 scsiDev.data[idx++] = density;\r
290                 // Number of blocks\r
291                 // Zero == all remaining blocks shall have the medium\r
292                 // characteristics specified.\r
293                 scsiDev.data[idx++] = 0;\r
294                 scsiDev.data[idx++] = 0;\r
295                 scsiDev.data[idx++] = 0;\r
296 \r
297                 scsiDev.data[idx++] = 0; // reserved\r
298 \r
299                 // Block length\r
300                 uint32_t bytesPerSector = scsiDev.target->liveCfg.bytesPerSector;\r
301                 scsiDev.data[idx++] = bytesPerSector >> 16;\r
302                 scsiDev.data[idx++] = bytesPerSector >> 8;\r
303                 scsiDev.data[idx++] = bytesPerSector & 0xFF;\r
304         }\r
305 \r
306         int pageFound = 0;\r
307 \r
308         if (pageCode == 0x01 || pageCode == 0x3F)\r
309         {\r
310                 pageFound = 1;\r
311                 if ((scsiDev.compatMode >= COMPAT_SCSI2))\r
312                 {\r
313                         pageIn(pc, idx, ReadWriteErrorRecoveryPage, sizeof(ReadWriteErrorRecoveryPage));\r
314                         idx += sizeof(ReadWriteErrorRecoveryPage);\r
315                 }\r
316                 else\r
317                 {\r
318                         pageIn(pc, idx, ReadWriteErrorRecoveryPage_SCSI1, sizeof(ReadWriteErrorRecoveryPage_SCSI1));\r
319                         idx += sizeof(ReadWriteErrorRecoveryPage_SCSI1);\r
320                 }\r
321         }\r
322 \r
323         if (pageCode == 0x02 || pageCode == 0x3F)\r
324         {\r
325                 pageFound = 1;\r
326                 if ((scsiDev.compatMode >= COMPAT_SCSI2))\r
327                 {\r
328                         pageIn(pc, idx, DisconnectReconnectPage, sizeof(DisconnectReconnectPage));\r
329                         idx += sizeof(DisconnectReconnectPage);\r
330                 }\r
331                 else\r
332                 {\r
333                         pageIn(pc, idx, DisconnectReconnectPage_SCSI1, sizeof(DisconnectReconnectPage_SCSI1));\r
334                         idx += sizeof(DisconnectReconnectPage_SCSI1);\r
335                 }\r
336         }\r
337 \r
338         if (pageCode == 0x03 || pageCode == 0x3F)\r
339         {\r
340                 pageFound = 1;\r
341                 pageIn(pc, idx, FormatDevicePage, sizeof(FormatDevicePage));\r
342                 if (pc != 0x01)\r
343                 {\r
344                         uint16_t sectorsPerTrack = scsiDev.target->cfg->sectorsPerTrack;\r
345                         scsiDev.data[idx+10] = sectorsPerTrack >> 8;\r
346                         scsiDev.data[idx+11] = sectorsPerTrack & 0xFF;\r
347 \r
348                         // Fill out the configured bytes-per-sector\r
349                         uint32_t bytesPerSector = scsiDev.target->liveCfg.bytesPerSector;\r
350                         scsiDev.data[idx+12] = bytesPerSector >> 8;\r
351                         scsiDev.data[idx+13] = bytesPerSector & 0xFF;\r
352                 }\r
353                 else\r
354                 {\r
355                         // Set a mask for the changeable values.\r
356                         scsiDev.data[idx+12] = 0xFF;\r
357                         scsiDev.data[idx+13] = 0xFF;\r
358                 }\r
359 \r
360                 idx += sizeof(FormatDevicePage);\r
361         }\r
362 \r
363         if (pageCode == 0x04 || pageCode == 0x3F)\r
364         {\r
365                 pageFound = 1;\r
366                 if ((scsiDev.compatMode >= COMPAT_SCSI2))\r
367                 {\r
368                         pageIn(pc, idx, RigidDiskDriveGeometry, sizeof(RigidDiskDriveGeometry));\r
369                 }\r
370                 else\r
371                 {\r
372                         pageIn(pc, idx, RigidDiskDriveGeometry_SCSI1, sizeof(RigidDiskDriveGeometry_SCSI1));\r
373                 }\r
374 \r
375                 if (pc != 0x01)\r
376                 {\r
377                         // Need to fill out the number of cylinders.\r
378                         uint32 cyl;\r
379                         uint8 head;\r
380                         uint32 sector;\r
381                         LBA2CHS(\r
382                                 getScsiCapacity(\r
383                                         scsiDev.target->cfg->sdSectorStart,\r
384                                         scsiDev.target->liveCfg.bytesPerSector,\r
385                                         scsiDev.target->cfg->scsiSectors),\r
386                                 &cyl,\r
387                                 &head,\r
388                                 &sector,\r
389                                 scsiDev.target->cfg->headsPerCylinder,\r
390                                 scsiDev.target->cfg->sectorsPerTrack);\r
391 \r
392                         scsiDev.data[idx+2] = cyl >> 16;\r
393                         scsiDev.data[idx+3] = cyl >> 8;\r
394                         scsiDev.data[idx+4] = cyl;\r
395 \r
396                         memcpy(&scsiDev.data[idx+6], &scsiDev.data[idx+2], 3);\r
397                         memcpy(&scsiDev.data[idx+9], &scsiDev.data[idx+2], 3);\r
398 \r
399                         scsiDev.data[idx+5] = scsiDev.target->cfg->headsPerCylinder;\r
400                 }\r
401 \r
402                 if ((scsiDev.compatMode >= COMPAT_SCSI2))\r
403                 {\r
404                         idx += sizeof(RigidDiskDriveGeometry);\r
405                 }\r
406                 else\r
407                 {\r
408                         idx += sizeof(RigidDiskDriveGeometry_SCSI1);\r
409                 }\r
410         }\r
411 \r
412         // DON'T output the following pages for SCSI1 hosts. They get upset when\r
413         // we have more data to send than the allocation length provided.\r
414         // (ie. Try not to output any more pages below this comment)\r
415 \r
416 \r
417         if ((scsiDev.compatMode >= COMPAT_SCSI2) &&\r
418                 (pageCode == 0x08 || pageCode == 0x3F))\r
419         {\r
420                 pageFound = 1;\r
421                 pageIn(pc, idx, CachingPage, sizeof(CachingPage));\r
422                 idx += sizeof(CachingPage);\r
423         }\r
424 \r
425         if ((scsiDev.compatMode >= COMPAT_SCSI2)\r
426                 && (pageCode == 0x0A || pageCode == 0x3F))\r
427         {\r
428                 pageFound = 1;\r
429                 pageIn(pc, idx, ControlModePage, sizeof(ControlModePage));\r
430                 idx += sizeof(ControlModePage);\r
431         }\r
432 \r
433         if ((scsiDev.target->cfg->deviceType == CONFIG_SEQUENTIAL) &&\r
434                 (pageCode == 0x10 || pageCode == 0x3F))\r
435         {\r
436                 pageFound = 1;\r
437                 pageIn(\r
438                         pc,\r
439                         idx,\r
440                         SequentialDeviceConfigPage,\r
441                         sizeof(SequentialDeviceConfigPage));\r
442                 idx += sizeof(SequentialDeviceConfigPage);\r
443         }\r
444 \r
445         if ((\r
446                         (scsiDev.target->cfg->quirks == CONFIG_QUIRKS_APPLE) ||\r
447                         (idx + sizeof(AppleVendorPage) <= allocLength)\r
448                 ) &&\r
449                 (pageCode == 0x30 || pageCode == 0x3F))\r
450         {\r
451                 pageFound = 1;\r
452                 pageIn(pc, idx, AppleVendorPage, sizeof(AppleVendorPage));\r
453                 idx += sizeof(AppleVendorPage);\r
454         }\r
455 \r
456         if (!pageFound)\r
457         {\r
458                 // Unknown Page Code\r
459                 pageFound = 0;\r
460                 scsiDev.status = CHECK_CONDITION;\r
461                 scsiDev.target->sense.code = ILLEGAL_REQUEST;\r
462                 scsiDev.target->sense.asc = INVALID_FIELD_IN_CDB;\r
463                 scsiDev.phase = STATUS;\r
464         }\r
465         else\r
466         {\r
467                 // Go back and fill out the mode data length\r
468                 if (sixByteCmd)\r
469                 {\r
470                         // Cannot currently exceed limits. yay\r
471                         scsiDev.data[0] = idx - 1;\r
472                 }\r
473                 else\r
474                 {\r
475                         scsiDev.data[0] = ((idx - 2) >> 8);\r
476                         scsiDev.data[1] = (idx - 2);\r
477                 }\r
478 \r
479                 scsiDev.dataLen = idx > allocLength ? allocLength : idx;\r
480                 scsiDev.phase = DATA_IN;\r
481         }\r
482 }\r
483 \r
484 \r
485 // Callback after the DATA OUT phase is complete.\r
486 static void doModeSelect(void)\r
487 {\r
488         if (scsiDev.status == GOOD) // skip if we've already encountered an error\r
489         {\r
490                 // scsiDev.dataLen bytes are in scsiDev.data\r
491 \r
492                 int idx;\r
493                 int blockDescLen;\r
494                 if (scsiDev.cdb[0] == 0x55)\r
495                 {\r
496                         blockDescLen =\r
497                                 (((uint16_t)scsiDev.data[6]) << 8) |scsiDev.data[7];\r
498                         idx = 8;\r
499                 }\r
500                 else\r
501                 {\r
502                         blockDescLen = scsiDev.data[3];\r
503                         idx = 4;\r
504                 }\r
505 \r
506                 // The unwritten rule.  Blocksizes are normally set using the\r
507                 // block descriptor value, not by changing page 0x03.\r
508                 if (blockDescLen >= 8)\r
509                 {\r
510                         uint32_t bytesPerSector =\r
511                                 (((uint32_t)scsiDev.data[idx+5]) << 16) |\r
512                                 (((uint32_t)scsiDev.data[idx+6]) << 8) |\r
513                                 scsiDev.data[idx+7];\r
514                         if ((bytesPerSector < MIN_SECTOR_SIZE) ||\r
515                                 (bytesPerSector > MAX_SECTOR_SIZE))\r
516                         {\r
517                                 goto bad;\r
518                         }\r
519                         else\r
520                         {\r
521                                 scsiDev.target->liveCfg.bytesPerSector = bytesPerSector;\r
522                                 if (bytesPerSector != scsiDev.target->cfg->bytesPerSector)\r
523                                 {\r
524                                         configSave(scsiDev.target->targetId, bytesPerSector);\r
525                                 }\r
526                         }\r
527                 }\r
528                 idx += blockDescLen;\r
529 \r
530                 while (idx < scsiDev.dataLen)\r
531                 {\r
532                         int pageLen = scsiDev.data[idx + 1];\r
533                         if (idx + 2 + pageLen > scsiDev.dataLen) goto bad;\r
534 \r
535                         int pageCode = scsiDev.data[idx] & 0x3F;\r
536                         switch (pageCode)\r
537                         {\r
538                         case 0x03: // Format Device Page\r
539                         {\r
540                                 if (pageLen != 0x16) goto bad;\r
541 \r
542                                 // Fill out the configured bytes-per-sector\r
543                                 uint16_t bytesPerSector =\r
544                                         (((uint16_t)scsiDev.data[idx+12]) << 8) |\r
545                                         scsiDev.data[idx+13];\r
546 \r
547                                 // Sane values only, ok ?\r
548                                 if ((bytesPerSector < MIN_SECTOR_SIZE) ||\r
549                                         (bytesPerSector > MAX_SECTOR_SIZE))\r
550                                 {\r
551                                         goto bad;\r
552                                 }\r
553 \r
554                                 scsiDev.target->liveCfg.bytesPerSector = bytesPerSector;\r
555                                 if (scsiDev.cdb[1] & 1) // SP Save Pages flag\r
556                                 {\r
557                                         configSave(scsiDev.target->targetId, bytesPerSector);\r
558                                 }\r
559                         }\r
560                         break;\r
561                         //default:\r
562 \r
563                                 // Easiest to just ignore for now. We'll get here when changing\r
564                                 // the SCSI block size via the descriptor header.\r
565                         }\r
566                         idx += 2 + pageLen;\r
567                 }\r
568         }\r
569 \r
570         goto out;\r
571 bad:\r
572         scsiDev.status = CHECK_CONDITION;\r
573         scsiDev.target->sense.code = ILLEGAL_REQUEST;\r
574         scsiDev.target->sense.asc = INVALID_FIELD_IN_PARAMETER_LIST;\r
575 \r
576 out:\r
577         scsiDev.phase = STATUS;\r
578 }\r
579 \r
580 int scsiModeCommand()\r
581 {\r
582         int commandHandled = 1;\r
583 \r
584         uint8 command = scsiDev.cdb[0];\r
585 \r
586         // We don't currently support the setting of any parameters.\r
587         // (ie. no MODE SELECT(6) or MODE SELECT(10) commands)\r
588 \r
589         if (command == 0x1A)\r
590         {\r
591                 // MODE SENSE(6)\r
592                 int dbd = scsiDev.cdb[1] & 0x08; // Disable block descriptors\r
593                 int pc = scsiDev.cdb[2] >> 6; // Page Control\r
594                 int pageCode = scsiDev.cdb[2] & 0x3F;\r
595                 int allocLength = scsiDev.cdb[4];\r
596 \r
597                 // SCSI1 standard: (CCS X3T9.2/86-52)\r
598                 // "An Allocation Length of zero indicates that no MODE SENSE data shall\r
599                 // be transferred. This condition shall not be considered as an error."\r
600                 doModeSense(1, dbd, pc, pageCode, allocLength);\r
601         }\r
602         else if (command == 0x5A)\r
603         {\r
604                 // MODE SENSE(10)\r
605                 int dbd = scsiDev.cdb[1] & 0x08; // Disable block descriptors\r
606                 int pc = scsiDev.cdb[2] >> 6; // Page Control\r
607                 int pageCode = scsiDev.cdb[2] & 0x3F;\r
608                 int allocLength =\r
609                         (((uint16) scsiDev.cdb[7]) << 8) +\r
610                         scsiDev.cdb[8];\r
611                 doModeSense(0, dbd, pc, pageCode, allocLength);\r
612         }\r
613         else if (command == 0x15)\r
614         {\r
615                 // MODE SELECT(6)\r
616                 int len = scsiDev.cdb[4];\r
617                 if (len == 0)\r
618                 {\r
619                         // If len == 0, then transfer no data. From the SCSI 2 standard:\r
620                         //      A parameter list length of zero indicates that no data shall\r
621                         //      be transferred. This condition shall not be considered as an\r
622                         //              error.\r
623                         scsiDev.phase = STATUS;\r
624                 }\r
625                 else\r
626                 {\r
627                         scsiDev.dataLen = len;\r
628                         scsiDev.phase = DATA_OUT;\r
629                         scsiDev.postDataOutHook = doModeSelect;\r
630                 }\r
631         }\r
632         else if (command == 0x55)\r
633         {\r
634                 // MODE SELECT(10)\r
635                 int allocLength = (((uint16) scsiDev.cdb[7]) << 8) + scsiDev.cdb[8];\r
636                 if (allocLength == 0)\r
637                 {\r
638                         // If len == 0, then transfer no data. From the SCSI 2 standard:\r
639                         //      A parameter list length of zero indicates that no data shall\r
640                         //      be transferred. This condition shall not be considered as an\r
641                         //              error.\r
642                         scsiDev.phase = STATUS;\r
643                 }\r
644                 else\r
645                 {\r
646                         scsiDev.dataLen = allocLength;\r
647                         scsiDev.phase = DATA_OUT;\r
648                         scsiDev.postDataOutHook = doModeSelect;\r
649                 }\r
650         }\r
651         else\r
652         {\r
653                 commandHandled = 0;\r
654         }\r
655 \r
656         return commandHandled;\r
657 }\r
658 \r
659 #pragma GCC pop_options\r