]>
Commit | Line | Data |
---|---|---|
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 add_hla ; add a to hl\r | |
10 | public div32_16,div32_r ; divide 32 bit by 16 bit number (rounded)\r | |
11 | \r | |
12 | ; print utils\r | |
13 | \r | |
14 | public ?pmsg ; print message\r | |
15 | public pr.inln,pr.crlf ; print message inline, print newline\r | |
16 | public phex2,phex4 ; print 2 digit hex (A) or 4 digit hex (HL)\r | |
17 | public pr.dec,pr.decl ; print 16 or 32 bit decimal number\r | |
18 | public ?pderr ; print BIOS disk error message header\r | |
19 | \r | |
20 | \r | |
21 | \r | |
22 | extrn ?cono\r | |
23 | extrn @adrv,@trk,@sect ; used by disk error message\r | |
24 | \r | |
25 | ;-------------------------------------------------------------------------------\r | |
26 | \r | |
27 | cr equ 13\r | |
28 | lf equ 10\r | |
29 | bell equ 7\r | |
30 | \r | |
31 | \r | |
32 | dseg\r | |
33 | \r | |
34 | ;----------------------------------------------------------------------\r | |
35 | ; output bytes to consecutive portaddresses\r | |
36 | ;\r | |
37 | ; hl: table with following structure:\r | |
38 | ; db n, port1, val1, val2,... valn\r | |
39 | ; db m, port1, val1, val2,... valm\r | |
40 | ; ...\r | |
41 | ; db 0 ; Terminate table\r | |
42 | \r | |
43 | ioiniml:\r | |
44 | push bc\r | |
45 | xor a\r | |
46 | ioml_lp:\r | |
47 | ld b,(hl)\r | |
48 | inc hl\r | |
49 | cp b\r | |
50 | jr z,ioml_e\r | |
51 | \r | |
52 | ld c,(hl)\r | |
53 | inc hl\r | |
54 | otimr\r | |
55 | jr ioml_lp\r | |
56 | ioml_e:\r | |
57 | pop bc\r | |
58 | ret\r | |
59 | \r | |
60 | ;----------------------------------------------------------------------\r | |
61 | ; output bytes to ports\r | |
62 | ;\r | |
63 | ; hl: tables of port,value pairs:\r | |
64 | ; db n, port1,val1, port2,val2,... portn,valn\r | |
65 | ; ...\r | |
66 | ; db 0 ; Terminate table\r | |
67 | \r | |
68 | ioini1l:\r | |
69 | push bc\r | |
70 | jr io1_nxt\r | |
71 | io1_lp:\r | |
72 | ld c,(hl) ;port address\r | |
73 | inc hl\r | |
74 | otim\r | |
75 | jr nz,io1_lp\r | |
76 | io1_nxt:\r | |
77 | ld b,(hl) ;count\r | |
78 | inc hl\r | |
79 | inc b\r | |
80 | djnz io1_lp\r | |
81 | \r | |
82 | pop bc\r | |
83 | ret\r | |
84 | \r | |
85 | ;--------------------------------------------------------------------\r | |
86 | ; add a to hl\r | |
87 | ;\r | |
88 | ; return:\r | |
89 | ; hl = hl + a\r | |
90 | ; Flags undefined\r | |
91 | \r | |
92 | add_hla:\r | |
93 | add a,l\r | |
94 | ld l,a\r | |
95 | ret nc\r | |
96 | inc h\r | |
97 | ret\r | |
98 | \r | |
99 | ;--------------------------------------------------------------------\r | |
100 | ; rounded div 32 by 16 bit\r | |
101 | ;\r | |
102 | ; DEHL: Dividend (x)\r | |
103 | ; BC: Divisor (y)\r | |
104 | ; return:\r | |
105 | ; HLDE: Rounded Quotient (q)\r | |
106 | ; BC: Remainder (r)\r | |
107 | \r | |
108 | div32_r:\r | |
109 | push bc\r | |
110 | srl b ;y/2\r | |
111 | rr c\r | |
112 | add hl,bc ;low x + y/2\r | |
113 | pop bc\r | |
114 | jr nc,div_r1\r | |
115 | inc de\r | |
116 | div_r1:\r | |
117 | ;fall thru\r | |
118 | \r | |
119 | ;--------------------------------------------------------------------\r | |
120 | ; Divide 32 bit by 16\r | |
121 | ;\r | |
122 | ; DEHL: Dividend (x)\r | |
123 | ; BC: Divisor (y)\r | |
124 | ;\r | |
125 | ; return:\r | |
126 | ; DEHL: Quotient\r | |
127 | ; BC: Reminder\r | |
128 | \r | |
129 | div32_16:\r | |
130 | exx ;low\r | |
131 | push de ;save alternate registers (de,bc)\r | |
132 | push bc\r | |
133 | exx ;high\r | |
134 | push hl ;lx\r | |
135 | push bc ;ly\r | |
136 | ld bc,0 ;bc = hy = 0\r | |
137 | ld h,b ;hl = hr = 0\r | |
138 | ld l,c\r | |
139 | ;de = x, hl = r\r | |
140 | exx ;low\r | |
141 | pop bc ;bc' = ly\r | |
142 | ex (sp),hl ;hl' = lx, save alternate hl\r | |
143 | ld de,0 ;de' = lr = 0\r | |
144 | ex de,hl ;de = x, hl = r\r | |
145 | exx ;high\r | |
146 | ld a,32 ;count\r | |
147 | ;\r | |
148 | ; start:\r | |
149 | ; de: x (de: hx, de': lx)\r | |
150 | ; bc: y (bc: hy, bc': ly)\r | |
151 | ; hl: 0\r | |
152 | ;\r | |
153 | div_lp: ;do\r | |
154 | exx ; low\r | |
155 | ex de,hl ; x\r | |
156 | add hl,hl ; x <<= 1\r | |
157 | exx ; high\r | |
158 | ex de,hl ; x\r | |
159 | adc hl,hl ; x <<= 1\r | |
160 | exx ; low\r | |
161 | ex de,hl ; r\r | |
162 | adc hl,hl ; r <<= 1\r | |
163 | exx ; high\r | |
164 | ex de,hl ; r\r | |
165 | adc hl,hl ; r <<= 1\r | |
166 | exx ; low\r | |
167 | inc de ; x/q += 1\r | |
168 | or a ;\r | |
169 | sbc hl,bc ;\r | |
170 | exx ; high\r | |
171 | sbc hl,bc ;\r | |
172 | jr nc,div_no_restore\r | |
173 | exx ; low\r | |
174 | dec de ;\r | |
175 | add hl,bc ; r += y\r | |
176 | exx ; high\r | |
177 | adc hl,bc ;\r | |
178 | \r | |
179 | div_no_restore: ;\r | |
180 | dec a ;\r | |
181 | jr nz,div_lp ;while (--count)\r | |
182 | \r | |
183 | ; result:\r | |
184 | ; de: q (de: hq, de': lq)\r | |
185 | ; hl: r (hl: hr, hl': lr)\r | |
186 | \r | |
187 | exx ;low\r | |
188 | ex de,hl ;hl = lq, de = lr\r | |
189 | \r | |
190 | ex (sp),hl ;lq\r | |
191 | push de ;lr\r | |
192 | exx ;high\r | |
193 | pop bc ;bc = lr\r | |
194 | pop hl ;de = lq\r | |
195 | \r | |
196 | exx ;low\r | |
197 | pop bc ;restore alternate registers\r | |
198 | pop de\r | |
199 | exx ;high\r | |
200 | ret\r | |
201 | \r | |
202 | ;-------------------------------------------------------------------------------\r | |
203 | ; print message @<HL> up to a null\r | |
204 | ; saves <BC> & <DE>\r | |
205 | \r | |
206 | ?pmsg:\r | |
207 | push bc\r | |
208 | push de\r | |
209 | pmsg$loop:\r | |
210 | ld a,(hl)\r | |
211 | inc hl\r | |
212 | or a\r | |
213 | jr z,pmsg$exit\r | |
214 | ld c,a\r | |
215 | push hl\r | |
216 | call ?cono\r | |
217 | pop hl\r | |
218 | jr pmsg$loop\r | |
219 | pmsg$exit:\r | |
220 | pop de\r | |
221 | pop bc\r | |
222 | ret\r | |
223 | \r | |
224 | ;-------------------------------------------------------------------------------\r | |
225 | ; print message inline up to a null\r | |
226 | ; saves all registers\r | |
227 | \r | |
228 | pr.inln:\r | |
229 | ex (sp),hl\r | |
230 | push af\r | |
231 | call ?pmsg\r | |
232 | pop af\r | |
233 | ex (sp),hl\r | |
234 | ret\r | |
235 | \r | |
236 | ;-------------------------------------------------------------------------------\r | |
237 | ; print <CR><LF>\r | |
238 | ; saves all registers\r | |
239 | \r | |
240 | pr.crlf:\r | |
241 | call pr.inln\r | |
242 | db cr,lf,0\r | |
243 | ret\r | |
244 | \r | |
245 | ;-------------------------------------------------------------------------------\r | |
246 | ; print hl as a 4 digit hexadecimal number\r | |
247 | ; saves all registers\r | |
248 | \r | |
249 | phex4:\r | |
250 | ld a,h\r | |
251 | call phex2\r | |
252 | ld a,l\r | |
253 | ; fall thru\r | |
254 | \r | |
255 | ;-------------------------------------------------------------------------------\r | |
256 | ; print a as a 2 digit hexadecimal number\r | |
257 | ; saves all registers\r | |
258 | \r | |
259 | phex2:\r | |
260 | push af\r | |
261 | rra\r | |
262 | rra\r | |
263 | rra\r | |
264 | rra\r | |
265 | call print.digit\r | |
266 | pop af\r | |
267 | \r | |
268 | print.digit:\r | |
269 | push hl\r | |
270 | push de\r | |
271 | push bc\r | |
272 | push af\r | |
273 | and 00fh\r | |
274 | cp 10\r | |
275 | jr c,prd_1\r | |
276 | add a,007h\r | |
277 | prd_1:\r | |
278 | add a,'0'\r | |
279 | \r | |
280 | ld c,a\r | |
281 | call ?cono\r | |
282 | pop af\r | |
283 | pop bc\r | |
284 | pop de\r | |
285 | pop hl\r | |
286 | ret\r | |
287 | \r | |
288 | \r | |
289 | ;-------------------------------------------------------------------------------\r | |
290 | ; print decimal 16 bit number from HL\r | |
291 | ;\r | |
292 | ; HL: unsigned binary number to print\r | |
293 | ; C: minimum print field width\r | |
294 | ; number is prined right-aligned\r | |
295 | ; B: pad character, typically ' ' or '0'\r | |
296 | \r | |
297 | pr.dec:\r | |
298 | push de\r | |
299 | ld de,0\r | |
300 | call pr.decl\r | |
301 | pop de\r | |
302 | ret\r | |
303 | \r | |
304 | ;-------------------------------------------------------------------------------\r | |
305 | ; print decimal 32 bit number from DEHL\r | |
306 | ;\r | |
307 | ; DEHL: unsigned binary number to print\r | |
308 | ; C: minimum print field width\r | |
309 | ; number is prined right-aligned\r | |
310 | ; B: pad character, typically ' ' or '0'\r | |
311 | \r | |
312 | pr.decl:\r | |
313 | push bc ;save width and fillchar\r | |
314 | push bc\r | |
315 | exx ;(alt)\r | |
316 | ex (sp),hl ;save hl', get width and fill\r | |
317 | push de ;save de'\r | |
318 | \r | |
319 | xor a\r | |
320 | ld d,a ;clear counter\r | |
321 | ld e,a\r | |
322 | push af ; string terminator\r | |
323 | inc sp\r | |
324 | \r | |
325 | prd_divloop: ;do\r | |
326 | exx ; (main)\r | |
327 | ld bc,10 ;\r | |
328 | call div32_16 ; get a digit\r | |
329 | ld a,c ;\r | |
330 | add a,'0' ; make it printable\r | |
331 | push af ;\r | |
332 | \r | |
333 | ld a,h ;\r | |
334 | or l ;\r | |
335 | or d ;\r | |
336 | or e ;\r | |
337 | exx ; (alt)\r | |
338 | inc sp ;\r | |
339 | inc de ;\r | |
340 | jr nz,prd_divloop ;\r | |
341 | \r | |
342 | prd_filloop: ;h=filler, l=field width\r | |
343 | ld a,e\r | |
344 | cp l\r | |
345 | jr nc,prd_out\r | |
346 | push hl\r | |
347 | inc sp\r | |
348 | inc de\r | |
349 | jr prd_filloop\r | |
350 | prd_out:\r | |
351 | ld hl,0\r | |
352 | add hl,sp ;ptr to beginning of number string (hl==0 here)\r | |
353 | call ?pmsg\r | |
354 | ex de,hl\r | |
355 | add hl,sp\r | |
356 | ld sp,hl\r | |
357 | inc sp ;remove string terminator\r | |
358 | pop de\r | |
359 | pop hl\r | |
360 | exx ;(main)\r | |
361 | pop bc\r | |
362 | ret\r | |
363 | \r | |
364 | \r | |
365 | ;-------------------------------------------------------------------------------\r | |
366 | \r | |
367 | ?pderr:\r | |
368 | ld hl,drive$msg\r | |
369 | call ?pmsg ; error header\r | |
370 | ld a,(@adrv)\r | |
371 | add a,'A'\r | |
372 | ld c,a\r | |
373 | call ?cono ; drive code\r | |
374 | ld hl,track$msg\r | |
375 | call ?pmsg ; track header\r | |
376 | ld c,0\r | |
377 | ld hl,(@trk)\r | |
378 | call pr.dec ; track number\r | |
379 | ld hl,sector$msg\r | |
380 | call ?pmsg ; sector header\r | |
381 | ld hl,(@sect)\r | |
382 | call pr.dec ; sector number\r | |
383 | ret\r | |
384 | \r | |
385 | ; error message components\r | |
386 | drive$msg: db cr,lf,bell,'BIOS Error on ',0\r | |
387 | track$msg: db ': T-',0\r | |
388 | sector$msg: db ', S-',0\r |