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Commit | Line | Data |
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947c5868 L |
1 | title 'general utility routines'\r |
2 | \r | |
3 | ; i/o port init routines\r | |
4 | \r | |
5 | public ioiniml,ioini1l ;\r | |
6 | \r | |
7 | ; math\r | |
8 | \r | |
9 | public ijphl ; vectored CALL point\r | |
10 | public add_hla ; add a to hl\r | |
11 | public div32_16,div32_r ; divide 32 bit by 16 bit number (rounded)\r | |
12 | \r | |
13 | ; print utils\r | |
14 | \r | |
15 | public ?pmsg ; print message\r | |
16 | public pr.idx ; print message from table indexed by <A>\r | |
17 | public pr.inln,pr.crlf ; print message inline, print newline\r | |
18 | public phex2,phex4 ; print 2 digit hex <A> or 4 digit hex <HL>\r | |
19 | public pr.dec,pr.decl ; print 16 or 32 bit decimal number\r | |
20 | public pr.errors ; print BIOS disk error message header\r | |
21 | \r | |
22 | \r | |
23 | \r | |
24 | extrn ?const,?conin,?cono\r | |
25 | extrn @adrv,@trk,@sect ; used by disk error message\r | |
26 | extrn @op,@ermde\r | |
27 | \r | |
28 | ;-------------------------------------------------------------------------------\r | |
29 | \r | |
30 | cr equ 13\r | |
31 | lf equ 10\r | |
32 | bell equ 7\r | |
33 | \r | |
34 | \r | |
35 | dseg\r | |
36 | \r | |
37 | ;----------------------------------------------------------------------\r | |
38 | ; output bytes to consecutive portaddresses\r | |
39 | ;\r | |
40 | ; hl: table with following structure:\r | |
41 | ; db n, port1, val1, val2,... valn\r | |
42 | ; db m, port1, val1, val2,... valm\r | |
43 | ; ...\r | |
44 | ; db 0 ; Terminate table\r | |
45 | \r | |
46 | ioiniml:\r | |
47 | push bc\r | |
48 | xor a\r | |
49 | ioml_lp:\r | |
50 | ld b,(hl)\r | |
51 | inc hl\r | |
52 | cp b\r | |
53 | jr z,ioml_e\r | |
54 | \r | |
55 | ld c,(hl)\r | |
56 | inc hl\r | |
57 | otimr\r | |
58 | jr ioml_lp\r | |
59 | ioml_e:\r | |
60 | pop bc\r | |
61 | ret\r | |
62 | \r | |
63 | ;----------------------------------------------------------------------\r | |
64 | ; output bytes to ports\r | |
65 | ;\r | |
66 | ; hl: tables of port,value pairs:\r | |
67 | ; db n, port1,val1, port2,val2,... portn,valn\r | |
68 | ; ...\r | |
69 | ; db 0 ; Terminate table\r | |
70 | \r | |
71 | ioini1l:\r | |
72 | push bc\r | |
73 | jr io1_nxt\r | |
74 | io1_lp:\r | |
75 | ld c,(hl) ;port address\r | |
76 | inc hl\r | |
77 | otim\r | |
78 | jr nz,io1_lp\r | |
79 | io1_nxt:\r | |
80 | ld b,(hl) ;count\r | |
81 | inc hl\r | |
82 | inc b\r | |
83 | djnz io1_lp\r | |
84 | \r | |
85 | pop bc\r | |
86 | ret\r | |
87 | \r | |
88 | cseg\r | |
89 | \r | |
90 | ;--------------------------------------------------------------------\r | |
91 | ; vectored CALL point\r | |
92 | \r | |
93 | ijphl:\r | |
94 | jp (hl)\r | |
95 | \r | |
96 | dseg\r | |
97 | \r | |
98 | ;--------------------------------------------------------------------\r | |
99 | ; add a to hl\r | |
100 | ;\r | |
101 | ; return:\r | |
102 | ; hl = hl + a\r | |
103 | ; Flags undefined\r | |
104 | \r | |
105 | add_hla:\r | |
106 | add a,l\r | |
107 | ld l,a\r | |
108 | ret nc\r | |
109 | inc h\r | |
110 | ret\r | |
111 | \r | |
112 | ;--------------------------------------------------------------------\r | |
113 | ; rounded div 32 by 16 bit\r | |
114 | ;\r | |
115 | ; DEHL: Dividend (x)\r | |
116 | ; BC: Divisor (y)\r | |
117 | ; return:\r | |
118 | ; HLDE: Rounded Quotient (q)\r | |
119 | ; BC: Remainder (r)\r | |
120 | \r | |
121 | div32_r:\r | |
122 | push bc\r | |
123 | srl b ;y/2\r | |
124 | rr c\r | |
125 | add hl,bc ;low x + y/2\r | |
126 | pop bc\r | |
127 | jr nc,div_r1\r | |
128 | inc de\r | |
129 | div_r1:\r | |
130 | ;fall thru\r | |
131 | \r | |
132 | ;--------------------------------------------------------------------\r | |
133 | ; Divide 32 bit by 16\r | |
134 | ;\r | |
135 | ; DEHL: Dividend (x)\r | |
136 | ; BC: Divisor (y)\r | |
137 | ;\r | |
138 | ; return:\r | |
139 | ; DEHL: Quotient\r | |
140 | ; BC: Reminder\r | |
141 | \r | |
142 | div32_16:\r | |
143 | exx ;low\r | |
144 | push de ;save alternate registers (de,bc)\r | |
145 | push bc\r | |
146 | exx ;high\r | |
147 | push hl ;lx\r | |
148 | push bc ;ly\r | |
149 | ld bc,0 ;bc = hy = 0\r | |
150 | ld h,b ;hl = hr = 0\r | |
151 | ld l,c\r | |
152 | ;de = x, hl = r\r | |
153 | exx ;low\r | |
154 | pop bc ;bc' = ly\r | |
155 | ex (sp),hl ;hl' = lx, save alternate hl\r | |
156 | ld de,0 ;de' = lr = 0\r | |
157 | ex de,hl ;de = x, hl = r\r | |
158 | exx ;high\r | |
159 | ld a,32 ;count\r | |
160 | ;\r | |
161 | ; start:\r | |
162 | ; de: x (de: hx, de': lx)\r | |
163 | ; bc: y (bc: hy, bc': ly)\r | |
164 | ; hl: 0\r | |
165 | ;\r | |
166 | div_lp: ;do\r | |
167 | exx ; low\r | |
168 | ex de,hl ; x\r | |
169 | add hl,hl ; x <<= 1\r | |
170 | exx ; high\r | |
171 | ex de,hl ; x\r | |
172 | adc hl,hl ; x <<= 1\r | |
173 | exx ; low\r | |
174 | ex de,hl ; r\r | |
175 | adc hl,hl ; r <<= 1\r | |
176 | exx ; high\r | |
177 | ex de,hl ; r\r | |
178 | adc hl,hl ; r <<= 1\r | |
179 | exx ; low\r | |
180 | inc de ; x/q += 1\r | |
181 | or a ;\r | |
182 | sbc hl,bc ;\r | |
183 | exx ; high\r | |
184 | sbc hl,bc ;\r | |
185 | jr nc,div_no_restore\r | |
186 | exx ; low\r | |
187 | dec de ;\r | |
188 | add hl,bc ; r += y\r | |
189 | exx ; high\r | |
190 | adc hl,bc ;\r | |
191 | \r | |
192 | div_no_restore: ;\r | |
193 | dec a ;\r | |
194 | jr nz,div_lp ;while (--count)\r | |
195 | \r | |
196 | ; result:\r | |
197 | ; de: q (de: hq, de': lq)\r | |
198 | ; hl: r (hl: hr, hl': lr)\r | |
199 | \r | |
200 | exx ;low\r | |
201 | ex de,hl ;hl = lq, de = lr\r | |
202 | \r | |
203 | ex (sp),hl ;lq\r | |
204 | push de ;lr\r | |
205 | exx ;high\r | |
206 | pop bc ;bc = lr\r | |
207 | pop hl ;de = lq\r | |
208 | \r | |
209 | exx ;low\r | |
210 | pop bc ;restore alternate registers\r | |
211 | pop de\r | |
212 | exx ;high\r | |
213 | ret\r | |
214 | \r | |
215 | ;-------------------------------------------------------------------------------\r | |
216 | ; print message @<HL> up to a null\r | |
217 | ; saves <BC> & <DE>\r | |
218 | \r | |
219 | ?pmsg:\r | |
220 | push bc\r | |
221 | push de\r | |
222 | pmsg$loop:\r | |
223 | ld a,(hl)\r | |
224 | inc hl\r | |
225 | or a\r | |
226 | jr z,pmsg$exit\r | |
227 | ld c,a\r | |
228 | push hl\r | |
229 | call ?cono\r | |
230 | pop hl\r | |
231 | jr pmsg$loop\r | |
232 | pmsg$exit:\r | |
233 | pop de\r | |
234 | pop bc\r | |
235 | ret\r | |
236 | \r | |
237 | ;-------------------------------------------------------------------------------\r | |
238 | ; print message from table @<HL>, indexed by <A>\r | |
239 | ; saves <BC> & <DE>\r | |
240 | \r | |
241 | pr.idx:\r | |
242 | push bc\r | |
243 | push de\r | |
244 | push hl ; put pointer to first message on stack\r | |
245 | ld e,a ; save message number\r | |
246 | xor a\r | |
247 | ld b,a\r | |
248 | ld c,a\r | |
249 | inc e\r | |
250 | pdc_nxt_str:\r | |
251 | dec e\r | |
252 | ex (sp),hl\r | |
253 | jr z,pdc_found\r | |
254 | ex (sp),hl\r | |
255 | cpir\r | |
256 | cp (hl)\r | |
257 | jr nz,pdc_nxt_str\r | |
258 | ; End of List, msg not found.\r | |
259 | ; Print first msg.\r | |
260 | pdc_found:\r | |
261 | pop hl\r | |
262 | call ?pmsg\r | |
263 | pop de\r | |
264 | pop bc\r | |
265 | ret\r | |
266 | \r | |
267 | ;-------------------------------------------------------------------------------\r | |
268 | ; print message inline up to a null\r | |
269 | ; saves all registers\r | |
270 | \r | |
271 | pr.inln:\r | |
272 | ex (sp),hl\r | |
273 | push af\r | |
274 | call ?pmsg\r | |
275 | pop af\r | |
276 | ex (sp),hl\r | |
277 | ret\r | |
278 | \r | |
279 | ;-------------------------------------------------------------------------------\r | |
280 | ; print <CR><LF>\r | |
281 | ; saves all registers\r | |
282 | \r | |
283 | pr.crlf:\r | |
284 | call pr.inln\r | |
285 | db cr,lf,0\r | |
286 | ret\r | |
287 | \r | |
288 | ;-------------------------------------------------------------------------------\r | |
289 | ; print hl as a 4 digit hexadecimal number\r | |
290 | ; saves all registers\r | |
291 | \r | |
292 | phex4:\r | |
293 | ld a,h\r | |
294 | call phex2\r | |
295 | ld a,l\r | |
296 | ; fall thru\r | |
297 | \r | |
298 | ;-------------------------------------------------------------------------------\r | |
299 | ; print a as a 2 digit hexadecimal number\r | |
300 | ; saves all registers\r | |
301 | \r | |
302 | phex2:\r | |
303 | push af\r | |
304 | rra\r | |
305 | rra\r | |
306 | rra\r | |
307 | rra\r | |
308 | call print.digit\r | |
309 | pop af\r | |
310 | \r | |
311 | print.digit:\r | |
312 | push hl\r | |
313 | push de\r | |
314 | push bc\r | |
315 | push af\r | |
316 | and 00fh\r | |
317 | cp 10\r | |
318 | jr c,prd_1\r | |
319 | add a,007h\r | |
320 | prd_1:\r | |
321 | add a,'0'\r | |
322 | \r | |
323 | ld c,a\r | |
324 | call ?cono\r | |
325 | pop af\r | |
326 | pop bc\r | |
327 | pop de\r | |
328 | pop hl\r | |
329 | ret\r | |
330 | \r | |
331 | \r | |
332 | ;-------------------------------------------------------------------------------\r | |
333 | ; print decimal 16 bit number from HL\r | |
334 | ;\r | |
335 | ; HL: unsigned binary number to print\r | |
336 | ; C: minimum print field width\r | |
337 | ; number is prined right-aligned\r | |
338 | ; B: pad character, typically ' ' or '0'\r | |
339 | \r | |
340 | pr.dec:\r | |
341 | push de\r | |
342 | ld de,0\r | |
343 | call pr.decl\r | |
344 | pop de\r | |
345 | ret\r | |
346 | \r | |
347 | ;-------------------------------------------------------------------------------\r | |
348 | ; print decimal 32 bit number from DEHL\r | |
349 | ;\r | |
350 | ; DEHL: unsigned binary number to print\r | |
351 | ; C: minimum print field width\r | |
352 | ; number is prined right-aligned\r | |
353 | ; B: pad character, typically ' ' or '0'\r | |
354 | \r | |
355 | pr.decl:\r | |
356 | push bc ;save width and fillchar\r | |
357 | push bc\r | |
358 | exx ;(alt)\r | |
359 | ex (sp),hl ;save hl', get width and fill\r | |
360 | push de ;save de'\r | |
361 | \r | |
362 | xor a\r | |
363 | ld d,a ;clear counter\r | |
364 | ld e,a\r | |
365 | push af ; string terminator\r | |
366 | inc sp\r | |
367 | \r | |
368 | prd_divloop: ;do\r | |
369 | exx ; (main)\r | |
370 | ld bc,10 ;\r | |
371 | call div32_16 ; get a digit\r | |
372 | ld a,c ;\r | |
373 | add a,'0' ; make it printable\r | |
374 | push af ;\r | |
375 | \r | |
376 | ld a,h ;\r | |
377 | or l ;\r | |
378 | or d ;\r | |
379 | or e ;\r | |
380 | exx ; (alt)\r | |
381 | inc sp ;\r | |
382 | inc de ;\r | |
383 | jr nz,prd_divloop ;\r | |
384 | \r | |
385 | prd_filloop: ;h=filler, l=field width\r | |
386 | ld a,e\r | |
387 | cp l\r | |
388 | jr nc,prd_out\r | |
389 | push hl\r | |
390 | inc sp\r | |
391 | inc de\r | |
392 | jr prd_filloop\r | |
393 | prd_out:\r | |
394 | ld hl,0\r | |
395 | add hl,sp ;ptr to beginning of number string (hl==0 here)\r | |
396 | call ?pmsg\r | |
397 | ex de,hl\r | |
398 | add hl,sp\r | |
399 | ld sp,hl\r | |
400 | inc sp ;remove string terminator\r | |
401 | pop de\r | |
402 | pop hl\r | |
403 | exx ;(main)\r | |
404 | pop bc\r | |
405 | ret\r | |
406 | \r | |
407 | \r | |
408 | ;-------------------------------------------------------------------------------\r | |
409 | \r | |
410 | ?pderr:\r | |
411 | ld hl,drive$msg\r | |
412 | call ?pmsg ; error header\r | |
413 | ld a,(@adrv)\r | |
414 | add a,'A'\r | |
415 | ld c,a\r | |
416 | call ?cono ; drive code\r | |
417 | ld hl,track$msg\r | |
418 | call ?pmsg ; track header\r | |
419 | ld c,0\r | |
420 | ld hl,(@trk)\r | |
421 | call pr.dec ; track number\r | |
422 | ld hl,sector$msg\r | |
423 | call ?pmsg ; sector header\r | |
424 | ld hl,(@sect)\r | |
425 | jp pr.dec ; sector number\r | |
426 | \r | |
427 | ; error message components\r | |
428 | drive$msg: db cr,lf,bell,'BIOS Error on ',0\r | |
429 | track$msg: db ': T-',0\r | |
430 | sector$msg: db ', S-',0\r | |
431 | \r | |
432 | \r | |
433 | ;-------------------------------------------------------------------------------\r | |
434 | ; get console input, echo it, and shift to upper case\r | |
435 | ; save hl,de,bc\r | |
436 | \r | |
437 | uciecho:\r | |
438 | push hl\r | |
439 | push de\r | |
440 | push bc\r | |
441 | u$c0:\r | |
442 | call ?const\r | |
443 | or a\r | |
444 | jr z,u$c1 ; see if any char already struck\r | |
445 | call ?conin\r | |
446 | jr u$c0 ; yes, eat it and try again\r | |
447 | u$c1:\r | |
448 | call ?conin\r | |
449 | push af\r | |
450 | ld c,a\r | |
451 | cp ' '-1\r | |
452 | call nc,?cono\r | |
453 | pop af\r | |
454 | pop bc\r | |
455 | pop de\r | |
456 | pop hl\r | |
457 | cp 'a'\r | |
458 | ret c\r | |
459 | sub 'a'-'A' ; make upper case\r | |
460 | ret\r | |
461 | \r | |
462 | ;-------------------------------------------------------------------------------\r | |
463 | ;\r | |
464 | \r | |
465 | pr.errors:\r | |
466 | \r | |
467 | ; suppress error message if BDOS\r | |
468 | ; is returning errors to application...\r | |
469 | \r | |
470 | ld a,(@ermde)\r | |
471 | inc a\r | |
472 | jr nz,pre1\r | |
473 | dec a ;return NZ, if @ermde == 0FFH\r | |
474 | ret\r | |
475 | pre1:\r | |
476 | push hl\r | |
477 | ld hl,pre2\r | |
478 | ex (sp),hl\r | |
479 | push hl\r | |
480 | \r | |
481 | ; Had permanent error, print message like:\r | |
482 | ; BIOS Err on d: T-nn, S-mm, <operation> <type>, Retry ?\r | |
483 | \r | |
484 | call ?pderr ; print message header\r | |
485 | \r | |
486 | ld hl,op$msg\r | |
487 | ld a,(@op)\r | |
488 | jp pr.idx ; last function (read or write)\r | |
489 | \r | |
490 | pre2:\r | |
491 | ; prompt for retry\r | |
492 | call pr.inln\r | |
493 | db ' Retry (Y/N) ? ',0\r | |
494 | \r | |
495 | call uciecho ; get operator response\r | |
496 | cp 'Y'\r | |
497 | ret ; return Z-flag for yes\r | |
498 | \r | |
499 | \r | |
500 | op$msg:\r | |
501 | db ', Unknown op, ',0\r | |
502 | db ', Read, ',0\r | |
503 | db ', Write, ',0\r | |
504 | db 0\r | |
505 | \r | |
506 | end\r |