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1 | ; Filesystem functions for the Interaction with BIOS and Disks | |
2 | ; | |
3 | ; Copyright (C) 2010 Frank Zoll | |
4 | ; | |
5 | ; This file is part of avrcpm. | |
6 | ; | |
7 | ; avrcpm is free software: you can redistribute it and/or modify it | |
8 | ; under the terms of the GNU General Public License as published by | |
9 | ; the Free Software Foundation, either version 3 of the License, or | |
10 | ; (at your option) any later version. | |
11 | ; | |
12 | ; avrcpm is distributed in the hope that it will be useful, | |
13 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | ; GNU General Public License for more details. | |
16 | ; | |
17 | ; You should have received a copy of the GNU General Public License | |
18 | ; along with avrcpm. If not, see <http://www.gnu.org/licenses/>. | |
19 | ; | |
20 | ; $Id$ | |
21 | ; | |
22 | ||
23 | ||
24 | ; ---------------- Defines for the Filesystem Interface ------- | |
25 | ||
26 | ||
27 | ;***************************************************** | |
28 | ;* Disk-Manager constants * | |
29 | ;***************************************************** | |
30 | .equ dskType_None = 0 | |
31 | .equ dskType_CPM = 1 | |
32 | .equ dskType_FAT = 2 | |
33 | .equ dskType_RAM = 3 | |
34 | ||
35 | ;***************************************************** | |
36 | ;* CP/M to host disk constants * | |
37 | ;***************************************************** | |
38 | .equ MAXDISKS = 6 ;Max number of Disks (partitions) | |
39 | .equ PARTENTRY_SIZE = 9 ;Size of a Partitiontableentry | |
40 | .equ blksize = 1024 ;CP/M allocation size | |
41 | .equ hostsize = 512 ;host disk sector size | |
42 | ; .equ hostspt = 20 ;host disk sectors/trk | |
43 | .equ hostblk = hostsize/128 ;CP/M sects/host buff | |
44 | ; .equ CPMSPT = hostblk*hostspt ;CP/M sectors/track | |
45 | .equ CPMSPT = 26 ; | |
46 | .equ SECMSK = hostblk-1 ;sector mask | |
47 | .equ SECSHF = log2(hostblk) ;sector shift | |
48 | ||
49 | ;***************************************************** | |
50 | ;* BDOS constants on entry to write * | |
51 | ;***************************************************** | |
52 | .equ WRALL = 0 ;write to allocated | |
53 | .equ WRDIR = 1 ;write to directory | |
54 | .equ WRUAL = 2 ;write to unallocated | |
55 | .equ WRTMSK= 3 ;write type mask | |
56 | ||
57 | .equ READ_FUNC = 7 | |
58 | .equ WRITE_FUNC = 6 | |
59 | .equ BOOT_FUNC = 5 | |
60 | .equ HOME_FUNC = 4 | |
61 | ||
62 | ;----------------------------------------------- Start of Data Segment | |
63 | ||
64 | .dseg | |
65 | ||
66 | ndisks: .byte 1 ;Number of CP/M disks | |
67 | ||
68 | seekdsk: .byte 1 ;seek disk number | |
69 | seektrk: .byte 2 ;seek track number | |
70 | seeksec: .byte 1 ;seek sector number | |
71 | ||
72 | unacnt: .byte 1 ;unalloc rec cnt | |
73 | unadsk: .byte 1 ;last unalloc disk | |
74 | unatrk: .byte 2 ;last unalloc track | |
75 | unasec: .byte 1 ;last unalloc sector | |
76 | ||
77 | erflag: .byte 1 ;error reporting | |
78 | wrtype: .byte 1 ;write operation type | |
79 | dmaadr: .byte 2 ;last dma address | |
80 | ||
81 | hostbuf: .byte hostsize ;host buffer (from/to SD-card) | |
82 | hostparttbl: .byte PARTENTRY_SIZE*MAXDISKS ;host partition table (type, start sector, sector count) | |
83 | hostparttbltop: | |
84 | hostdsk: .byte 1 ;host disk number | |
85 | hosttype: .byte 1 ;host disk type (same entry as 1 parition entry) | |
86 | hostlba: .byte 3 ;host sector number (relative to partition start) | |
87 | ||
88 | ||
89 | ; ------------------------------- Start of Code Segment | |
90 | .cseg | |
91 | ||
92 | ; ==================================================================== | |
93 | ; Function: Get a Pointer to a Partitiontable entry | |
94 | ; ==================================================================== | |
95 | ; Parameters | |
96 | ; -------------------------------------------------------------------- | |
97 | ; Registers : [w] z Pointer to the Partitionentry | |
98 | ; [r] xl Number of Diskentry to Read | |
99 | ; -------------------------------------------------------------------- | |
100 | ; Description: | |
101 | ; ==================================================================== | |
102 | dsk_getpartentry: | |
103 | ||
104 | ldi zl,PARTENTRY_SIZE | |
105 | mul xl,zl | |
106 | ldiw z,hostparttbl | |
107 | add zl,_tmp0 | |
108 | add zh,_tmp1 | |
109 | ret | |
110 | ||
111 | ; ==================================================================== | |
112 | ; Function: | |
113 | ; ==================================================================== | |
114 | ; Parameters | |
115 | ; -------------------------------------------------------------------- | |
116 | ; Registers : none | |
117 | ; Variables : [r] seeksec Sector to read | |
118 | ; [r] seektrk Track to read | |
119 | ; -------------------------------------------------------------------- | |
120 | ; Description: | |
121 | ; ==================================================================== | |
122 | dskDiskCheck: | |
123 | lds temp2,seekdsk | |
124 | cpi temp2,RAMDISKNR | |
125 | brsh dsk_dchrd ;maybe ramdisk | |
126 | ||
127 | ; Check if selected disk # is less then # of disks. | |
128 | ||
129 | lds temp,ndisks | |
130 | tst temp | |
131 | brne dsk_dchpart1 | |
132 | ||
133 | ; No disks yet, need to init | |
134 | ||
135 | rcall mgr_init_partitions | |
136 | cbr temp,0x80 | |
137 | lds temp2,seekdsk | |
138 | ||
139 | dsk_dchpart1: | |
140 | cp temp2,temp | |
141 | brsh dsk_dcher | |
142 | ||
143 | dsk_dchend: | |
144 | ldi temp,0 | |
145 | ret | |
146 | ||
147 | dsk_dchrd: | |
148 | #if RAMDISKCNT | |
149 | cpi temp,RAMDISKNR+RAMDISKCNT | |
150 | brlo dsk_dchend | |
151 | #endif | |
152 | dsk_dcher: | |
153 | ldi temp,0xff ;error return | |
154 | ret | |
155 | ||
156 | dskErrorRet: | |
157 | lds temp,erflag | |
158 | ret | |
159 | ||
160 | dskDiskSel: | |
161 | sts seekdsk,temp | |
162 | ret | |
163 | ||
164 | dskTrackSel_l: | |
165 | sts seektrk,temp | |
166 | sts seektrk+1,_0 | |
167 | ret | |
168 | ||
169 | dskTrackSel_h: | |
170 | sts seektrk+1,temp | |
171 | ret | |
172 | ||
173 | dskSecSel: | |
174 | sts seeksec,temp | |
175 | ret | |
176 | ||
177 | dskDmal: | |
178 | sts dmaadr,temp | |
179 | ret | |
180 | ||
181 | dskDmah: | |
182 | sts dmaadr+1,temp | |
183 | ret | |
184 | ||
185 | ; ==================================================================== | |
186 | ; Function: Does a Disk interaction | |
187 | ; ==================================================================== | |
188 | ; Parameters | |
189 | ; -------------------------------------------------------------------- | |
190 | ; Registers : none | |
191 | ; Variables : [r] seeksec Sector to read | |
192 | ; [r] seektrk Track to read | |
193 | ; -------------------------------------------------------------------- | |
194 | ; Description: | |
195 | ; ==================================================================== | |
196 | dskDoIt: | |
197 | .if DISK_DEBUG | |
198 | push temp | |
199 | sbrc temp,READ_FUNC | |
200 | rjmp dskdbgr | |
201 | sbrc temp,WRITE_FUNC | |
202 | rjmp dskdbgw | |
203 | rjmp dskdbge | |
204 | ||
205 | dskdbgr: | |
206 | printnewline | |
207 | printstring "Disk read: " | |
208 | rjmp dskdbg1 | |
209 | dskdbgw: | |
210 | printnewline | |
211 | printstring "Disk write: " | |
212 | dskdbg1: | |
213 | lds temp,seekdsk | |
214 | subi temp,-('A') | |
215 | rcall uartputc | |
216 | printstring ": track " | |
217 | lds temp2,seektrk+1 | |
218 | lds temp,seektrk | |
219 | rcall printhexw | |
220 | printstring ", sector " | |
221 | lds temp,seeksec | |
222 | rcall printhex | |
223 | printstring ", dma-addr " | |
224 | lds temp2,dmaadr+1 | |
225 | lds temp,dmaadr | |
226 | rcall printhexw | |
227 | pop temp | |
228 | push temp | |
229 | sbrs temp,WRITE_FUNC | |
230 | rjmp dskdbge | |
231 | printstring " wrtype " | |
232 | andi temp,3 | |
233 | rcall printhex | |
234 | dskdbge: | |
235 | pop temp | |
236 | .endif | |
237 | ;See what has to be done. | |
238 | sbrc temp,READ_FUNC | |
239 | rjmp dsk_read | |
240 | sbrc temp,WRITE_FUNC | |
241 | rjmp dsk_write | |
242 | sbrc temp,HOME_FUNC | |
243 | rjmp dsk_home | |
244 | sbrc temp,BOOT_FUNC | |
245 | rjmp dsk_boot | |
246 | ||
247 | printstring "DISK I/O: Invalid Function code: " | |
248 | rcall printhex | |
249 | rjmp haltinv | |
250 | ||
251 | dsk_boot: | |
252 | sts ndisks,_0 ;no active partitions | |
253 | dsk_cboot: | |
254 | cbi flags,hostact ;host buffer inactive | |
255 | sts unacnt,_0 ;clear unalloc count | |
256 | ret | |
257 | ||
258 | dsk_home: | |
259 | sbis flags,hostwrt ;check for pending write | |
260 | cbi flags,hostact ;clear host active flag | |
261 | ret | |
262 | ||
263 | ||
264 | ||
265 | ; ==================================================================== | |
266 | ; Function: Does a Disk read operation | |
267 | ; ==================================================================== | |
268 | ; Parameters | |
269 | ; -------------------------------------------------------------------- | |
270 | ; Registers : in: temp | |
271 | ; Variables : [r] seekdsk Number of Disk to Read | |
272 | ; [r] seeksec Sector to read | |
273 | ; [r] seektrk Track to read | |
274 | ; -------------------------------------------------------------------- | |
275 | ; Description: | |
276 | ; ==================================================================== | |
277 | dsk_read: | |
278 | sts erflag,_0 | |
279 | sbi flags,readop ; Set read operation flag | |
280 | ;RAM disk? | |
281 | lds xl,seekdsk | |
282 | #if RAMDISKCNT | |
283 | cpi xl,RAMDISKNR | |
284 | brlt PC+2 | |
285 | rjmp rdsk_read | |
286 | #endif | |
287 | rcall dsk_getpartentry ; Get Paritiontableentry | |
288 | ld temp,z ; Get Partitiontype | |
289 | ||
290 | ; Isn't it a Disk ? | |
291 | cpi temp,dskType_None | |
292 | brne PC+2 | |
293 | rjmp dsk_read_err | |
294 | ; It must be a FAT16-Imagefile or CP/M Partition. | |
295 | sts unacnt,_0 | |
296 | sbi flags,rsflag ;must read data | |
297 | ldi temp,WRUAL ;write type | |
298 | sts wrtype,temp ;treat as unalloc | |
299 | rjmp dsk_rwoper ;to perform the read | |
300 | ||
301 | dsk_read_err: | |
302 | ret | |
303 | ||
304 | ; ==================================================================== | |
305 | ; Function: Does a Disk write operation | |
306 | ; ==================================================================== | |
307 | ; Parameters | |
308 | ; -------------------------------------------------------------------- | |
309 | ; Registers : in: temp Write type | |
310 | ; Variables : [r] seekdsk Number of Disk to Read | |
311 | ; [r] seeksec Sector to read | |
312 | ; [r] seektrk Track to read | |
313 | ; -------------------------------------------------------------------- | |
314 | ; Description: | |
315 | ; ==================================================================== | |
316 | dsk_write: | |
317 | ;write the selected sector | |
318 | sts erflag,_0 | |
319 | cbi flags,readop ; not a read operation | |
320 | ;RAM disk? | |
321 | lds xl,seekdsk | |
322 | #if RAMDISKCNT | |
323 | cpi xl,RAMDISKNR | |
324 | brlt PC+2 | |
325 | rjmp rdsk_write | |
326 | #endif | |
327 | rcall dsk_getpartentry ; Get Paritiontableentry | |
328 | ld temp2,z ; Get Partitiontype | |
329 | ||
330 | ; Isn't it a Disk ? | |
331 | cpi temp2,dskType_None | |
332 | brne PC+2 | |
333 | rjmp dsk_write_err | |
334 | ||
335 | ||
336 | ; It must be a FAT16-Imagefile or CP/M Partition. | |
337 | ||
338 | cbi flags,readop ;not a read operation | |
339 | ||
340 | andi temp,WRTMSK | |
341 | sts wrtype,temp ;save write type | |
342 | ||
343 | cpi temp,WRUAL ;write unallocated? | |
344 | brne dsk_chkuna ;check for unalloc | |
345 | ||
346 | ; write to unallocated, set parameters | |
347 | ldi temp,blksize/128 ;next unalloc recs | |
348 | sts unacnt,temp | |
349 | lds temp,seekdsk ;disk to seek | |
350 | sts unadsk,temp ;unadsk = sekdsk | |
351 | lds temp,seektrk | |
352 | sts unatrk,temp ;unatrk = sectrk | |
353 | lds temp,seektrk+1 | |
354 | sts unatrk+1,temp ;unatrk = sectrk | |
355 | lds temp,seeksec | |
356 | sts unasec,temp ;unasec = seksec | |
357 | ; | |
358 | dsk_chkuna: | |
359 | ;check for write to unallocated sector | |
360 | lds temp,unacnt ;any unalloc remain? | |
361 | tst temp | |
362 | breq dsk_alloc ;skip if not | |
363 | ||
364 | ; more unallocated records remain | |
365 | dec temp ;unacnt = unacnt-1 | |
366 | sts unacnt,temp | |
367 | lds temp,seekdsk ;same disk? | |
368 | lds temp2,unadsk | |
369 | cp temp,temp2 ;seekdsk = unadsk? | |
370 | brne dsk_alloc ;skip if not | |
371 | ||
372 | ; disks are the same | |
373 | lds temp,unatrk | |
374 | lds temp2,unatrk+1 | |
375 | lds temp3,seektrk | |
376 | lds temp4,seektrk+1 | |
377 | cp temp,temp3 ;seektrk = unatrk? | |
378 | cpc temp2,temp4 | |
379 | brne dsk_alloc ;skip if not | |
380 | ||
381 | ; tracks are the same | |
382 | lds temp,seeksec ;same sector? | |
383 | lds temp2,unasec | |
384 | cp temp,temp2 ;seeksec = unasec? | |
385 | brne dsk_alloc ;skip if not | |
386 | ||
387 | ; match, move to next sector for future ref | |
388 | inc temp2 ;unasec = unasec+1 | |
389 | sts unasec,temp2 | |
390 | cpi temp2,CPMSPT ;end of track? (count CP/M sectors) | |
391 | brlo dsk_noovf ;skip if no overflow | |
392 | ||
393 | ; overflow to next track | |
394 | sts unasec,_0 ;unasec = 0 | |
395 | lds temp,unatrk | |
396 | lds temp2,unatrk+1 | |
397 | subi temp, low(-1) ;unatrk = unatrk+1 | |
398 | sbci temp2,high(-1) | |
399 | sts unatrk,temp | |
400 | sts unatrk+1,temp2 | |
401 | ; | |
402 | dsk_noovf: | |
403 | cbi flags,rsflag ;rsflag = 0 | |
404 | rjmp dsk_rwoper ;to perform the write | |
405 | ; | |
406 | dsk_alloc: | |
407 | ;not an unallocated record, requires pre-read | |
408 | sts unacnt,_0 ;unacnt = 0 | |
409 | sbi flags,rsflag ;rsflag = 1 | |
410 | rjmp dsk_rwoper | |
411 | ||
412 | dsk_write_err: | |
413 | ret | |
414 | ||
415 | ; ==================================================================== | |
416 | ; Function: Does a Disk read/write operation | |
417 | ; ==================================================================== | |
418 | ; Parameters | |
419 | ; -------------------------------------------------------------------- | |
420 | ; Registers : none | |
421 | ; Variables : [r] seekdsk Number of Disk to Read | |
422 | ; [r] seeksec Sector to read | |
423 | ; [r] seektrk Track to read | |
424 | ; -------------------------------------------------------------------- | |
425 | ; Description: | |
426 | ; ==================================================================== | |
427 | dsk_rwoper: | |
428 | ;enter here to perform the read/write | |
429 | .if DISK_DEBUG | |
430 | printstring ", flags: " | |
431 | in temp,flags | |
432 | rcall printhex | |
433 | .endif | |
434 | sts erflag,_0 ;no errors (yet) | |
435 | ||
436 | ;Convert track/sector to an LBA address (in 128byte blocks) | |
437 | ||
438 | lds xl,seeksec ; | |
439 | ldi xh,0 ; | |
440 | ldi yl,0 ; | |
441 | lds temp3,seektrk ; | |
442 | lds temp4,seektrk+1 ; | |
443 | ldi temp,CPMSPT ; | |
444 | mul temp3,temp ; | |
445 | add xl,r0 ; | |
446 | adc xh,r1 ; | |
447 | mul temp4,temp ; | |
448 | add xh,r0 ;yl:xh:xl := sec + trk * SectorsPerTrack | |
449 | adc yl,r1 ; | |
450 | ||
451 | mov temp,xl | |
452 | andi temp,SECMSK ;mask buffer number | |
453 | push temp ;save for later | |
454 | ||
455 | ;Convert from CP/M LBA blocks to host LBA blocks | |
456 | ldi temp,SECSHF | |
457 | dsk_sh1: | |
458 | lsr yl | |
459 | ror xh | |
460 | ror xl | |
461 | dec temp | |
462 | brne dsk_sh1 | |
463 | ;yl:xh:xl = host block to seek | |
464 | ; active host sector? | |
465 | in _tmp0,flags ;host active flag | |
466 | sbi flags,hostact ;always becomes 1 | |
467 | sbrs _tmp0,hostact ;was it already? | |
468 | rjmp dsk_filhst ;fill host if not | |
469 | ||
470 | ; host buffer active, same as seek buffer? | |
471 | lds temp,seekdsk | |
472 | lds temp2,hostdsk ;same disk? | |
473 | cp temp,temp2 ;seekdsk = hostdsk? | |
474 | brne dsk_nomatch | |
475 | ||
476 | ; same disk, same block? | |
477 | lds temp,hostlba | |
478 | lds temp2,hostlba+1 | |
479 | lds temp3,hostlba+2 | |
480 | cp xl,temp | |
481 | cpc xh,temp2 | |
482 | cpc yl,temp3 | |
483 | breq dsk_match | |
484 | ; | |
485 | dsk_nomatch: | |
486 | ;proper disk, but not correct sector | |
487 | sbis flags,hostwrt ;host written? | |
488 | rjmp dsk_filhst | |
489 | push xl | |
490 | push xh | |
491 | push yl | |
492 | rcall dsk_writehost ;clear host buff | |
493 | pop yl | |
494 | pop xh | |
495 | pop xl | |
496 | ||
497 | dsk_filhst: | |
498 | ;may have to fill the host buffer | |
499 | lds temp,seekdsk | |
500 | sts hostdsk,temp | |
501 | sts hostlba,xl | |
502 | sts hostlba+1,xh | |
503 | sts hostlba+2,yl | |
504 | ||
505 | sbic flags,rsflag ;need to read? | |
506 | rcall dsk_readhost ;yes, if 1 | |
507 | cbi flags,hostwrt ;no pending write | |
508 | ||
509 | dsk_match: | |
510 | ||
511 | ;copy data to or from buffer | |
512 | ldiw z,hostbuf | |
513 | ldi temp,128 | |
514 | pop temp2 ;get buffer number (which part of hostbuf) | |
515 | mul temp2,temp | |
516 | add zl,r0 ;offset in hostbuf | |
517 | adc zh,r1 | |
518 | ||
519 | .if DISK_DEBUG > 2 | |
520 | push r0 | |
521 | push r1 | |
522 | printstring "; host buf adr: " | |
523 | pop temp2 | |
524 | pop temp | |
525 | rcall printhexw | |
526 | .endif | |
527 | ||
528 | lds xl,dmaadr | |
529 | lds xh,dmaadr+1 | |
530 | ldi temp3,128 ;length of move | |
531 | sbic flags,readop ;which way? | |
532 | rjmp dsk_rmove ;skip if read | |
533 | ||
534 | ; mark write operation | |
535 | sbi flags,hostwrt ;hostwrt = 1 | |
536 | dsk_wmove: | |
537 | mem_read | |
538 | st z+,temp | |
539 | adiw xl,1 | |
540 | dec temp3 | |
541 | brne dsk_wmove | |
542 | rjmp dsk_rwmfin | |
543 | ||
544 | dsk_rmove: | |
545 | ld temp,z+ | |
546 | mem_write | |
547 | adiw xl,1 | |
548 | dec temp3 | |
549 | brne dsk_rmove | |
550 | dsk_rwmfin: | |
551 | ; data has been moved to/from host buffer | |
552 | lds temp,wrtype ;write type | |
553 | cpi temp,WRDIR ;to directory? | |
554 | breq dsk_wdir | |
555 | ret ;no further processing | |
556 | dsk_wdir: | |
557 | ; clear host buffer for directory write | |
558 | lds temp,erflag | |
559 | tst temp ;errors? | |
560 | breq dsk_wdir1 | |
561 | ret ;skip if so | |
562 | dsk_wdir1: | |
563 | rcall dsk_writehost ;clear host buff | |
564 | cbi flags,hostwrt ;buffer written | |
565 | ret | |
566 | ||
567 | ; ==================================================================== | |
568 | ; Function: Does a Disk write operation | |
569 | ; ==================================================================== | |
570 | ; Parameters | |
571 | ; -------------------------------------------------------------------- | |
572 | ; Registers : none | |
573 | ; Variables : [r] seekdsk Number of Disk to Read | |
574 | ; [r] seeksec Sector to read | |
575 | ; [r] seektrk Track to read | |
576 | ; -------------------------------------------------------------------- | |
577 | ; Description: | |
578 | ; ==================================================================== | |
579 | dsk_writehost: | |
580 | lds xl,hostdsk | |
581 | rcall dsk_getpartentry | |
582 | ld temp,z | |
583 | ||
584 | #if FAT16_SUPPORT | |
585 | ; Is it a FAT16 Diskimage ? | |
586 | cpi temp,dskType_FAT | |
587 | brne PC+2 | |
588 | rjmp fat_writehost | |
589 | #endif | |
590 | ||
591 | ; Is it a CP/M Partition ? | |
592 | cpi temp,dskType_CPM | |
593 | brne PC+2 | |
594 | rjmp cpm_writehost | |
595 | ; Disktype not supported -> Return | |
596 | ret | |
597 | ||
598 | ; ==================================================================== | |
599 | ; Function: Does a Disk read operation | |
600 | ; ==================================================================== | |
601 | ; Parameters | |
602 | ; -------------------------------------------------------------------- | |
603 | ; Registers : none | |
604 | ; Variables : [r] seekdsk Number of Disk to Read | |
605 | ; [r] seeksec Sector to read | |
606 | ; [r] seektrk Track to read | |
607 | ; -------------------------------------------------------------------- | |
608 | ; Description: | |
609 | ; ==================================================================== | |
610 | dsk_readhost: | |
611 | lds xl,hostdsk | |
612 | rcall dsk_getpartentry | |
613 | ld temp,z | |
614 | ||
615 | #if FAT16_SUPPORT | |
616 | ; Is it a FAT16 Diskimage ? | |
617 | cpi temp,dskType_FAT | |
618 | brne PC+2 | |
619 | rjmp fat_readhost | |
620 | #endif | |
621 | ||
622 | ; Is it a CP/M Partition ? | |
623 | cpi temp,dskType_CPM | |
624 | brne PC+2 | |
625 | rjmp cpm_readhost | |
626 | ; Disktype not supported -> Return | |
627 | ret | |
628 |