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z80 timing change
[picodrive.git] / Pico / Memory.s
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4ff2d527 1@ vim:filetype=armasm\r
2\r
cc68a136 3@ memory handlers with banking support for SSF II - The New Challengers\r
4@ mostly based on Gens code\r
5\r
6@ (c) Copyright 2006, notaz\r
7@ All Rights Reserved\r
8\r
9\r
10\r
11.text\r
12\r
13@ default jump tables\r
14\r
15m_read8_def_table:\r
16 .long m_read8_rom0 @ 0x000000 - 0x07FFFF\r
17 .long m_read8_rom1 @ 0x080000 - 0x0FFFFF\r
18 .long m_read8_rom2 @ 0x100000 - 0x17FFFF\r
19 .long m_read8_rom3 @ 0x180000 - 0x1FFFFF\r
20 .long m_read8_rom4 @ 0x200000 - 0x27FFFF\r
21 .long m_read8_rom5 @ 0x280000 - 0x2FFFFF\r
22 .long m_read8_rom6 @ 0x300000 - 0x37FFFF\r
23 .long m_read8_rom7 @ 0x380000 - 0x3FFFFF\r
24 .long m_read8_rom8 @ 0x400000 - 0x47FFFF\r
25 .long m_read8_rom9 @ 0x480000 - 0x4FFFFF\r
26 .long m_read8_romA @ 0x500000 - 0x57FFFF\r
27 .long m_read8_romB @ 0x580000 - 0x5FFFFF\r
28 .long m_read8_romC @ 0x600000 - 0x67FFFF\r
29 .long m_read8_romD @ 0x680000 - 0x6FFFFF\r
30 .long m_read8_romE @ 0x700000 - 0x77FFFF\r
31 .long m_read8_romF @ 0x780000 - 0x7FFFFF\r
32 .long m_read_null @ 0x800000 - 0x87FFFF\r
33 .long m_read_null @ 0x880000 - 0x8FFFFF\r
34 .long m_read_null @ 0x900000 - 0x97FFFF\r
35 .long m_read_null @ 0x980000 - 0x9FFFFF\r
36 .long m_read8_misc @ 0xA00000 - 0xA7FFFF\r
37 .long m_read_null @ 0xA80000 - 0xAFFFFF\r
38 .long m_read_null @ 0xB00000 - 0xB7FFFF\r
39 .long m_read_null @ 0xB80000 - 0xBFFFFF\r
40 .long m_read8_vdp @ 0xC00000 - 0xC7FFFF\r
41 .long m_read8_vdp @ 0xC80000 - 0xCFFFFF\r
42 .long m_read_null @ 0xD00000 - 0xD7FFFF\r
43 .long m_read_null @ 0xD80000 - 0xDFFFFF\r
44 .long m_read8_ram @ 0xE00000 - 0xE7FFFF\r
45 .long m_read8_ram @ 0xE80000 - 0xEFFFFF\r
46 .long m_read8_ram @ 0xF00000 - 0xF7FFFF\r
47 .long m_read8_ram @ 0xF80000 - 0xFFFFFF\r
48\r
49m_read16_def_table:\r
50 .long m_read16_rom0 @ 0x000000 - 0x07FFFF\r
51 .long m_read16_rom1 @ 0x080000 - 0x0FFFFF\r
52 .long m_read16_rom2 @ 0x100000 - 0x17FFFF\r
53 .long m_read16_rom3 @ 0x180000 - 0x1FFFFF\r
54 .long m_read16_rom4 @ 0x200000 - 0x27FFFF\r
55 .long m_read16_rom5 @ 0x280000 - 0x2FFFFF\r
56 .long m_read16_rom6 @ 0x300000 - 0x37FFFF\r
57 .long m_read16_rom7 @ 0x380000 - 0x3FFFFF\r
58 .long m_read16_rom8 @ 0x400000 - 0x47FFFF\r
59 .long m_read16_rom9 @ 0x480000 - 0x4FFFFF\r
60 .long m_read16_romA @ 0x500000 - 0x57FFFF\r
61 .long m_read16_romB @ 0x580000 - 0x5FFFFF\r
62 .long m_read16_romC @ 0x600000 - 0x67FFFF\r
63 .long m_read16_romD @ 0x680000 - 0x6FFFFF\r
64 .long m_read16_romE @ 0x700000 - 0x77FFFF\r
65 .long m_read16_romF @ 0x780000 - 0x7FFFFF\r
66 .long m_read_null @ 0x800000 - 0x87FFFF\r
67 .long m_read_null @ 0x880000 - 0x8FFFFF\r
68 .long m_read_null @ 0x900000 - 0x97FFFF\r
69 .long m_read_null @ 0x980000 - 0x9FFFFF\r
70 .long m_read16_misc @ 0xA00000 - 0xA7FFFF\r
71 .long m_read_null @ 0xA80000 - 0xAFFFFF\r
72 .long m_read_null @ 0xB00000 - 0xB7FFFF\r
73 .long m_read_null @ 0xB80000 - 0xBFFFFF\r
74 .long m_read16_vdp @ 0xC00000 - 0xC7FFFF\r
75 .long m_read_null @ 0xC80000 - 0xCFFFFF\r
76 .long m_read_null @ 0xD00000 - 0xD7FFFF\r
77 .long m_read_null @ 0xD80000 - 0xDFFFFF\r
78 .long m_read16_ram @ 0xE00000 - 0xE7FFFF\r
79 .long m_read16_ram @ 0xE80000 - 0xEFFFFF\r
80 .long m_read16_ram @ 0xF00000 - 0xF7FFFF\r
81 .long m_read16_ram @ 0xF80000 - 0xFFFFFF\r
82\r
83m_read32_def_table:\r
84 .long m_read32_rom0 @ 0x000000 - 0x07FFFF\r
85 .long m_read32_rom1 @ 0x080000 - 0x0FFFFF\r
86 .long m_read32_rom2 @ 0x100000 - 0x17FFFF\r
87 .long m_read32_rom3 @ 0x180000 - 0x1FFFFF\r
88 .long m_read32_rom4 @ 0x200000 - 0x27FFFF\r
89 .long m_read32_rom5 @ 0x280000 - 0x2FFFFF\r
90 .long m_read32_rom6 @ 0x300000 - 0x37FFFF\r
91 .long m_read32_rom7 @ 0x380000 - 0x3FFFFF\r
92 .long m_read32_rom8 @ 0x400000 - 0x47FFFF\r
93 .long m_read32_rom9 @ 0x480000 - 0x4FFFFF\r
94 .long m_read32_romA @ 0x500000 - 0x57FFFF\r
95 .long m_read32_romB @ 0x580000 - 0x5FFFFF\r
96 .long m_read32_romC @ 0x600000 - 0x67FFFF\r
97 .long m_read32_romD @ 0x680000 - 0x6FFFFF\r
98 .long m_read32_romE @ 0x700000 - 0x77FFFF\r
99 .long m_read32_romF @ 0x780000 - 0x7FFFFF\r
100 .long m_read_null @ 0x800000 - 0x87FFFF\r
101 .long m_read_null @ 0x880000 - 0x8FFFFF\r
102 .long m_read_null @ 0x900000 - 0x97FFFF\r
103 .long m_read_null @ 0x980000 - 0x9FFFFF\r
104 .long m_read32_misc @ 0xA00000 - 0xA7FFFF\r
105 .long m_read_null @ 0xA80000 - 0xAFFFFF\r
106 .long m_read_null @ 0xB00000 - 0xB7FFFF\r
107 .long m_read_null @ 0xB80000 - 0xBFFFFF\r
108 .long m_read32_vdp @ 0xC00000 - 0xC7FFFF\r
109 .long m_read_null @ 0xC80000 - 0xCFFFFF\r
110 .long m_read_null @ 0xD00000 - 0xD7FFFF\r
111 .long m_read_null @ 0xD80000 - 0xDFFFFF\r
112 .long m_read32_ram @ 0xE00000 - 0xE7FFFF\r
113 .long m_read32_ram @ 0xE80000 - 0xEFFFFF\r
114 .long m_read32_ram @ 0xF00000 - 0xF7FFFF\r
115 .long m_read32_ram @ 0xF80000 - 0xFFFFFF\r
116\r
117\r
118@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r
119\r
120.bss\r
121@.section .bss, "brw"\r
122@.data\r
123\r
124@ used tables\r
125m_read8_table:\r
126 .skip 32*4\r
127\r
128m_read16_table:\r
129 .skip 32*4\r
130\r
131m_read32_table:\r
132 .skip 32*4\r
133\r
134\r
135@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r
136\r
137.text\r
138\r
139.global PicoMemReset\r
140.global PicoRead8\r
141.global PicoRead16\r
142.global PicoRead32\r
143.global PicoWriteRomHW_SSF2\r
144\r
145\r
146PicoMemReset:\r
147 ldr r12,=(Pico+0x22204)\r
148 ldr r12,[r12] @ romsize\r
149 add r12,r12,#0x80000\r
150 sub r12,r12,#1\r
151 mov r12,r12,lsr #19\r
152\r
153 ldr r0, =m_read8_table\r
154 ldr r1, =m_read8_def_table\r
155 mov r2, #32\r
1561:\r
157 ldr r3, [r1], #4\r
158 str r3, [r0], #4\r
159 subs r2, r2, #1\r
160 bne 1b\r
161\r
162 ldr r0, =m_read16_table\r
163 ldr r1, =m_read16_def_table\r
164 mov r2, #32\r
1651:\r
166 subs r2, r2, #1\r
167 ldr r3, [r1], #4\r
168 str r3, [r0], #4\r
169 bne 1b\r
170\r
171 ldr r0, =m_read32_table\r
172 ldr r1, =m_read32_def_table\r
173 mov r2, #32\r
1741:\r
175 subs r2, r2, #1\r
176 ldr r3, [r1], #4\r
177 str r3, [r0], #4\r
178 bne 1b\r
179\r
180 @ update memhandlers according to ROM size\r
181 ldr r1, =m_read8_above_rom\r
182 ldr r0, =m_read8_table\r
183 mov r2, #16\r
1841:\r
185 sub r2, r2, #1\r
186 cmp r2, r12\r
187 blt 2f\r
188 cmp r2, #4\r
189 beq 1b @ do not touch the SRAM area\r
190 str r1, [r0, r2, lsl #2]\r
191 b 1b\r
1922:\r
193 ldr r1, =m_read16_above_rom\r
194 ldr r0, =m_read16_table\r
195 mov r2, #16\r
1961:\r
197 sub r2, r2, #1\r
198 cmp r2, r12\r
199 blt 2f\r
200 cmp r2, #4\r
201 beq 1b\r
202 str r1, [r0, r2, lsl #2]\r
203 b 1b\r
2042:\r
205 ldr r1, =m_read32_above_rom\r
206 ldr r0, =m_read32_table\r
207 mov r2, #16\r
2081:\r
209 sub r2, r2, #1\r
210 cmp r2, r12\r
211 blt 2f\r
212 cmp r2, #4\r
213 beq 1b\r
214 str r1, [r0, r2, lsl #2]\r
215 b 1b\r
2162:\r
217 bx lr\r
218\r
219.pool\r
220\r
221@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r
222\r
223PicoRead8: @ u32 a\r
224 ldr r2, =m_read8_table\r
225 bic r0, r0, #0xff000000\r
226 and r1, r0, #0x00f80000\r
227 ldr pc, [r2, r1, lsr #17]\r
228\r
229PicoRead16: @ u32 a\r
230 ldr r2, =m_read16_table\r
231 bic r0, r0, #0xff000000\r
232 and r1, r0, #0x00f80000\r
233 ldr pc, [r2, r1, lsr #17]\r
234\r
235PicoRead32: @ u32 a\r
236 ldr r2, =m_read32_table\r
237 bic r0, r0, #0xff000000\r
238 and r1, r0, #0x00f80000\r
239 ldr pc, [r2, r1, lsr #17]\r
240\r
241.pool\r
242\r
243@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r
244\r
245m_read_null:\r
246 mov r0, #0\r
247 bx lr\r
248\r
249\r
250.macro m_read8_rom sect\r
251 ldr r1, =(Pico+0x22200)\r
252 bic r0, r0, #0xf80000\r
253 ldr r1, [r1]\r
254.if \sect\r
255 orr r0, r0, #0x080000*\sect\r
256.endif\r
257 eor r0, r0, #1\r
258 ldrb r0, [r1, r0]\r
259 bx lr\r
260.endm\r
261\r
262\r
263m_read8_rom0: @ 0x000000 - 0x07ffff\r
264 m_read8_rom 0\r
265\r
266m_read8_rom1: @ 0x080000 - 0x0fffff\r
267 m_read8_rom 1\r
268\r
269m_read8_rom2: @ 0x100000 - 0x17ffff\r
270 m_read8_rom 2\r
271\r
272m_read8_rom3: @ 0x180000 - 0x1fffff\r
273 m_read8_rom 3\r
274\r
275m_read8_rom4: @ 0x200000 - 0x27ffff, SRAM area\r
276 ldr r2, =(SRam)\r
277 ldr r3, =(Pico+0x22200)\r
278 ldr r1, [r2, #8] @ SRam.end\r
279 bic r0, r0, #0xf80000\r
280 orr r0, r0, #0x200000\r
281 cmp r0, r1\r
282 bgt m_read8_nosram\r
283 ldr r1, [r2, #4] @ SRam.start (1ci)\r
284 cmp r0, r1\r
285 blt m_read8_nosram\r
286 ldrb r1, [r3, #0x11] @ Pico.m.sram_reg (1ci)\r
287 sub r12,r0, #0x200000\r
288 tst r1, #0x10\r
289 bne m_read8_detected\r
290 cmp r12,#1\r
291 ble m_read8_detected\r
292 tst r1, #1\r
293 orrne r1, r1, #0x10\r
294 strneb r1, [r3, #0x11]\r
295m_read8_detected:\r
296 tst r1, #4 @ EEPROM read?\r
297 ldrne r0, =SRAMReadEEPROM @ (1ci if ne)\r
298 bxne r0\r
299m_read8_noteeprom:\r
300 tst r1, #1\r
301 beq m_read8_nosram\r
302 ldr r3, [r2] @ SRam.data\r
303 ldr r2, [r2, #4] @ SRam.start (1ci)\r
304 sub r3, r3, r2\r
305 ldrb r0, [r3, r0]\r
306 bx lr\r
307m_read8_nosram:\r
308 ldr r1, [r3, #4] @ 1ci\r
309 cmp r0, r1\r
310 movgt r0, #0\r
311 bxgt lr @ bad location\r
312 ldr r1, [r3]\r
313 eor r0, r0, #1\r
314 ldrb r0, [r1, r0]\r
315 bx lr\r
316\r
317m_read8_rom5: @ 0x280000 - 0x2fffff\r
318 m_read8_rom 5\r
319\r
320m_read8_rom6: @ 0x300000 - 0x37ffff\r
321 m_read8_rom 6\r
322\r
323m_read8_rom7: @ 0x380000 - 0x3fffff\r
324 m_read8_rom 7\r
325\r
326m_read8_rom8: @ 0x400000 - 0x47ffff\r
327 m_read8_rom 8\r
328\r
329m_read8_rom9: @ 0x480000 - 0x4fffff\r
330 m_read8_rom 9\r
331\r
332@ is any ROM using that much?\r
333m_read8_romA: @ 0x500000 - 0x57ffff\r
334 m_read8_rom 0xA\r
335\r
336m_read8_romB: @ 0x580000 - 0x5fffff\r
337 m_read8_rom 0xB\r
338\r
339m_read8_romC: @ 0x600000 - 0x67ffff\r
340 m_read8_rom 0xC\r
341\r
342m_read8_romD: @ 0x680000 - 0x6fffff\r
343 m_read8_rom 0xD\r
344\r
345m_read8_romE: @ 0x700000 - 0x77ffff\r
346 m_read8_rom 0xE\r
347\r
348m_read8_romF: @ 0x780000 - 0x7fffff\r
349 m_read8_rom 0xF\r
350\r
351m_read8_misc:\r
352 bic r2, r0, #0x00ff\r
353 bic r2, r2, #0xbf00\r
354 cmp r2, #0xa00000 @ Z80 RAM?\r
355 ldreq r2, =z80Read8\r
356 bxeq r2\r
357 stmfd sp!,{r0,lr}\r
358 bic r0, r0, #1\r
359 mov r1, #8\r
360 bl OtherRead16\r
361 ldmfd sp!,{r1,lr}\r
362 tst r1, #1\r
363 moveq r0, r0, lsr #8\r
364 bx lr\r
365\r
366m_read8_vdp:\r
367 tst r0, #0x70000\r
368 tsteq r0, #0x000e0\r
369 bxne lr @ invalid read\r
370 stmfd sp!,{r0,lr}\r
371 bic r0, r0, #1\r
372 bl PicoVideoRead\r
373 ldmfd sp!,{r1,lr}\r
374 tst r1, #1\r
375 moveq r0, r0, lsr #8\r
376 bx lr\r
377\r
378m_read8_ram:\r
379 ldr r1, =Pico\r
380 bic r0, r0, #0xff0000\r
381 eor r0, r0, #1\r
382 ldrb r0, [r1, r0]\r
383 bx lr\r
384\r
385m_read8_above_rom:\r
386 stmfd sp!,{r0,lr}\r
387 bic r0, r0, #1\r
388 mov r1, #8\r
66fdc0f0 389 bl OtherRead16End\r
cc68a136 390 ldmfd sp!,{r1,lr}\r
391 tst r1, #1\r
392 moveq r0, r0, lsr #8\r
393 bx lr\r
394\r
395.pool\r
396\r
397@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r
398\r
399.macro m_read16_rom sect\r
400 ldr r1, =(Pico+0x22200)\r
401 bic r0, r0, #0xf80000\r
402 ldr r1, [r1]\r
403 bic r0, r0, #1\r
404.if \sect\r
405 orr r0, r0, #0x080000*\sect\r
406.endif\r
407 ldrh r0, [r1, r0]\r
408 bx lr\r
409.endm\r
410\r
411\r
412m_read16_rom0: @ 0x000000 - 0x07ffff\r
413 m_read16_rom 0\r
414\r
415m_read16_rom1: @ 0x080000 - 0x0fffff\r
416 m_read16_rom 1\r
417\r
418m_read16_rom2: @ 0x100000 - 0x17ffff\r
419 m_read16_rom 2\r
420\r
421m_read16_rom3: @ 0x180000 - 0x1fffff\r
422 m_read16_rom 3\r
423\r
424m_read16_rom4: @ 0x200000 - 0x27ffff, SRAM area (NBA Live 95)\r
425 ldr r2, =(SRam)\r
426 ldr r3, =(Pico+0x22200)\r
427 ldr r1, [r2, #8] @ SRam.end\r
428 bic r0, r0, #0xf80000\r
429 bic r0, r0, #1\r
430 orr r0, r0, #0x200000\r
431 cmp r0, r1\r
432 bgt m_read16_nosram\r
433 ldrb r1, [r3, #0x11] @ Pico.m.sram_reg (2ci)\r
434 tst r1, #1\r
435 beq m_read16_nosram\r
436 ldr r1, [r2, #4] @ SRam.start (1ci)\r
437 cmp r0, r1\r
438 blt m_read16_nosram\r
439 ldr r2, [r2] @ SRam.data (1ci)\r
440 sub r2, r2, r1\r
441 ldrh r0, [r2, r0] @ 2ci\r
442 and r1, r0, #0xff\r
443 mov r0, r0, lsr #8\r
444 orr r0, r0, r1, lsl #8\r
445 bx lr\r
446m_read16_nosram:\r
447 ldr r1, [r3, #4] @ 1ci\r
448 cmp r0, r1\r
449 movgt r0, #0\r
450 bxgt lr @ bad location\r
451 ldr r1, [r3] @ 1ci\r
452 ldrh r0, [r1, r0]\r
453 bx lr\r
454\r
455m_read16_rom5: @ 0x280000 - 0x2fffff\r
456 m_read16_rom 5\r
457\r
458m_read16_rom6: @ 0x300000 - 0x37ffff\r
459 m_read16_rom 6\r
460\r
461m_read16_rom7: @ 0x380000 - 0x3fffff\r
462 m_read16_rom 7\r
463\r
464m_read16_rom8: @ 0x400000 - 0x47ffff\r
465 m_read16_rom 8\r
466\r
467m_read16_rom9: @ 0x480000 - 0x4fffff\r
468 m_read16_rom 9\r
469\r
470@ is any ROM using that much?\r
471m_read16_romA: @ 0x500000 - 0x57ffff\r
472 m_read16_rom 0xA\r
473\r
474m_read16_romB: @ 0x580000 - 0x5fffff\r
475 m_read16_rom 0xB\r
476\r
477m_read16_romC: @ 0x600000 - 0x67ffff\r
478 m_read16_rom 0xC\r
479\r
480m_read16_romD: @ 0x680000 - 0x6fffff\r
481 m_read16_rom 0xD\r
482\r
483m_read16_romE: @ 0x700000 - 0x77ffff\r
484 m_read16_rom 0xE\r
485\r
486m_read16_romF: @ 0x780000 - 0x7fffff\r
487 m_read16_rom 0xF\r
488\r
489m_read16_misc:\r
cc68a136 490 bic r0, r0, #1\r
4ff2d527 491 mov r1, #16\r
492 b OtherRead16\r
493@ ldr r2, =OtherRead16\r
494@ bx r2\r
cc68a136 495\r
496m_read16_vdp:\r
497 tst r0, #0x70000\r
498 tsteq r0, #0x000e0\r
499 bxne lr @ invalid read\r
cc68a136 500 bic r0, r0, #1\r
4ff2d527 501 b PicoVideoRead\r
502@ ldr r1, =PicoVideoRead\r
503@ bx r1\r
cc68a136 504\r
505m_read16_ram:\r
506 ldr r1, =Pico\r
507 bic r0, r0, #0xff0000\r
508 bic r0, r0, #1\r
509 ldrh r0, [r1, r0]\r
510 bx lr\r
511\r
512m_read16_above_rom:\r
cc68a136 513 bic r0, r0, #1\r
4ff2d527 514 mov r1, #16\r
515 b OtherRead16End\r
516@ ldr r2, =OtherRead16End\r
517@ bx r2\r
cc68a136 518\r
519.pool\r
520\r
521@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r
522\r
523.macro m_read32_rom sect\r
524 ldr r1, =(Pico+0x22200)\r
525 bic r0, r0, #0xf80000\r
526 ldr r1, [r1]\r
527 bic r0, r0, #1\r
528.if \sect\r
529 orr r0, r0, #0x080000*\sect\r
530.endif\r
531 ldrh r0, [r1, r0]!\r
532 ldrh r1, [r1, #2] @ 1ci\r
533 orr r0, r1, r0, lsl #16\r
534 bx lr\r
535.endm\r
536\r
537\r
538m_read32_rom0: @ 0x000000 - 0x07ffff\r
539 m_read32_rom 0\r
540\r
541m_read32_rom1: @ 0x080000 - 0x0fffff\r
542 m_read32_rom 1\r
543\r
544m_read32_rom2: @ 0x100000 - 0x17ffff\r
545 m_read32_rom 2\r
546\r
547m_read32_rom3: @ 0x180000 - 0x1fffff\r
548 m_read32_rom 3\r
549\r
550m_read32_rom4: @ 0x200000 - 0x27ffff, SRAM area (does any game do long reads?)\r
551 ldr r2, =(SRam)\r
552 ldr r3, =(Pico+0x22200)\r
553 ldr r1, [r2, #8] @ SRam.end\r
554 bic r0, r0, #0xf80000\r
555 bic r0, r0, #1\r
556 orr r0, r0, #0x200000\r
557 cmp r0, r1\r
558 bgt m_read32_nosram\r
559 ldrb r1, [r3, #0x11] @ Pico.m.sram_reg (2ci)\r
560 tst r1, #1\r
561 beq m_read32_nosram\r
562 ldr r1, [r2, #4] @ SRam.start (1ci)\r
563 cmp r0, r1\r
564 blt m_read32_nosram\r
565 ldr r2, [r2] @ SRam.data (1ci)\r
566 sub r2, r2, r1\r
567 ldrh r0, [r2, r0]! @ (1ci)\r
568 ldrh r1, [r2, #2]\r
569 orr r0, r0, r0, lsl #16\r
570 mov r0, r0, ror #8\r
571 mov r0, r0, lsl #16\r
572 orr r0, r0, r1, lsr #8\r
573 and r1, r1, #0xff\r
574 orr r0, r0, r1, lsl #8\r
575 bx lr\r
576m_read32_nosram:\r
577 ldr r1, [r3, #4] @ (1ci)\r
578 cmp r0, r1\r
579 movgt r0, #0\r
580 bxgt lr @ bad location\r
581 ldr r1, [r3] @ (1ci)\r
582 ldrh r0, [r1, r0]!\r
583 ldrh r1, [r1, #2] @ (2ci)\r
584 orr r0, r1, r0, lsl #16\r
585 bx lr\r
586\r
587m_read32_rom5: @ 0x280000 - 0x2fffff\r
588 m_read32_rom 5\r
589\r
590m_read32_rom6: @ 0x300000 - 0x37ffff\r
591 m_read32_rom 6\r
592\r
593m_read32_rom7: @ 0x380000 - 0x3fffff\r
594 m_read32_rom 7\r
595\r
596m_read32_rom8: @ 0x400000 - 0x47ffff\r
597 m_read32_rom 8\r
598\r
599m_read32_rom9: @ 0x480000 - 0x4fffff\r
600 m_read32_rom 9\r
601\r
602@ is any ROM using that much?\r
603m_read32_romA: @ 0x500000 - 0x57ffff\r
604 m_read32_rom 0xA\r
605\r
606m_read32_romB: @ 0x580000 - 0x5fffff\r
607 m_read32_rom 0xB\r
608\r
609m_read32_romC: @ 0x600000 - 0x67ffff\r
610 m_read32_rom 0xC\r
611\r
612m_read32_romD: @ 0x680000 - 0x6fffff\r
613 m_read32_rom 0xD\r
614\r
615m_read32_romE: @ 0x700000 - 0x77ffff\r
616 m_read32_rom 0xE\r
617\r
618m_read32_romF: @ 0x780000 - 0x7fffff\r
619 m_read32_rom 0xF\r
620\r
621m_read32_misc:\r
622 bic r0, r0, #1\r
623 stmfd sp!,{r0,lr}\r
624 mov r1, #32\r
625 bl OtherRead16\r
626 mov r1, r0\r
627 ldmfd sp!,{r0}\r
628 stmfd sp!,{r1}\r
629 add r0, r0, #2\r
630 mov r1, #32\r
631 bl OtherRead16\r
632 ldmfd sp!,{r1,lr}\r
633 orr r0, r0, r1, lsl #16\r
634 bx lr\r
635\r
636m_read32_vdp:\r
637 tst r0, #0x70000\r
638 tsteq r0, #0x000e0\r
639 bxne lr @ invalid read\r
640 bic r0, r0, #1\r
4ff2d527 641 add r1, r0, #2\r
642 stmfd sp!,{r1,lr}\r
cc68a136 643 bl PicoVideoRead\r
4ff2d527 644 swp r0, r0, [sp]\r
cc68a136 645 bl PicoVideoRead\r
646 ldmfd sp!,{r1,lr}\r
647 orr r0, r0, r1, lsl #16\r
648 bx lr\r
649\r
650m_read32_ram:\r
651 ldr r1, =Pico\r
652 bic r0, r0, #0xff0000\r
653 bic r0, r0, #1\r
654 ldrh r0, [r1, r0]!\r
655 ldrh r1, [r1, #2] @ 2ci\r
656 orr r0, r1, r0, lsl #16\r
657 bx lr\r
658\r
659m_read32_above_rom:\r
660 bic r0, r0, #1\r
661 stmfd sp!,{r0,lr}\r
662 mov r1, #32\r
66fdc0f0 663 bl OtherRead16End\r
cc68a136 664 mov r1, r0\r
665 ldmfd sp!,{r0}\r
666 stmfd sp!,{r1}\r
667 add r0, r0, #2\r
668 mov r1, #32\r
66fdc0f0 669 bl OtherRead16End\r
cc68a136 670 ldmfd sp!,{r1,lr}\r
671 orr r0, r0, r1, lsl #16\r
672 bx lr\r
673\r
674.pool\r
675\r
676@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r
677\r
678PicoWriteRomHW_SSF2: @ u32 a, u32 d\r
679 and r0, r0, #0xe\r
680 movs r0, r0, lsr #1\r
681 bne pwr_banking\r
682\r
683 @ sram register\r
684 ldr r2, =(Pico+0x22211) @ Pico.m.sram_reg\r
685 and r1, r1, #3\r
686 strb r1, [r2]\r
687 bx lr\r
688\r
689pwr_banking:\r
690 and r1, r1, #0x1f\r
691\r
692 ldr r3, =m_read8_def_table\r
693 ldr r2, =m_read8_table\r
694 ldr r12, [r3, r1, lsl #2]\r
695 str r12, [r2, r0, lsl #2]\r
696\r
697 ldr r3, =m_read16_def_table\r
698 ldr r2, =m_read16_table\r
699 ldr r12, [r3, r1, lsl #2]\r
700 str r12, [r2, r0, lsl #2]\r
701\r
702 ldr r3, =m_read32_def_table\r
703 ldr r2, =m_read32_table\r
704 ldr r12, [r3, r1, lsl #2]\r
705 str r12, [r2, r0, lsl #2]\r
706 \r
707 bx lr\r
fast MegaDrive/MegaCD/32X emulator