notaz.gp2x.de / picodrive.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
timers implemented for new z80 mode
[picodrive.git] / Pico / Memory.s
CommitLineData
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
6cadc2da 6@ (c) Copyright 2006-2007, Grazvydas "notaz" Ignotas\r
cc68a136 7@ All Rights Reserved\r
8\r
9\r
e5503e2f 10.include "port_config.s"\r
cc68a136 11\r
12.text\r
3ec29f01 13.align 4\r
cc68a136 14\r
15@ default jump tables\r
16\r
17m_read8_def_table:\r
18 .long m_read8_rom0 @ 0x000000 - 0x07FFFF\r
19 .long m_read8_rom1 @ 0x080000 - 0x0FFFFF\r
20 .long m_read8_rom2 @ 0x100000 - 0x17FFFF\r
21 .long m_read8_rom3 @ 0x180000 - 0x1FFFFF\r
22 .long m_read8_rom4 @ 0x200000 - 0x27FFFF\r
23 .long m_read8_rom5 @ 0x280000 - 0x2FFFFF\r
24 .long m_read8_rom6 @ 0x300000 - 0x37FFFF\r
25 .long m_read8_rom7 @ 0x380000 - 0x3FFFFF\r
29a95187 26 .long m_read8_rom8 @ 0x400000 - 0x47FFFF - for all those large ROM hacks\r
cc68a136 27 .long m_read8_rom9 @ 0x480000 - 0x4FFFFF\r
28 .long m_read8_romA @ 0x500000 - 0x57FFFF\r
29 .long m_read8_romB @ 0x580000 - 0x5FFFFF\r
30 .long m_read8_romC @ 0x600000 - 0x67FFFF\r
31 .long m_read8_romD @ 0x680000 - 0x6FFFFF\r
32 .long m_read8_romE @ 0x700000 - 0x77FFFF\r
33 .long m_read8_romF @ 0x780000 - 0x7FFFFF\r
29a95187 34 .long m_read8_rom10 @ 0x800000 - 0x87FFFF\r
35 .long m_read8_rom11 @ 0x880000 - 0x8FFFFF\r
36 .long m_read8_rom12 @ 0x900000 - 0x97FFFF\r
37 .long m_read8_rom13 @ 0x980000 - 0x9FFFFF\r
cc68a136 38 .long m_read8_misc @ 0xA00000 - 0xA7FFFF\r
39 .long m_read_null @ 0xA80000 - 0xAFFFFF\r
40 .long m_read_null @ 0xB00000 - 0xB7FFFF\r
41 .long m_read_null @ 0xB80000 - 0xBFFFFF\r
42 .long m_read8_vdp @ 0xC00000 - 0xC7FFFF\r
43 .long m_read8_vdp @ 0xC80000 - 0xCFFFFF\r
7969166e 44 .long m_read8_vdp @ 0xD00000 - 0xD7FFFF\r
45 .long m_read8_vdp @ 0xD80000 - 0xDFFFFF\r
cc68a136 46 .long m_read8_ram @ 0xE00000 - 0xE7FFFF\r
47 .long m_read8_ram @ 0xE80000 - 0xEFFFFF\r
48 .long m_read8_ram @ 0xF00000 - 0xF7FFFF\r
49 .long m_read8_ram @ 0xF80000 - 0xFFFFFF\r
50\r
51m_read16_def_table:\r
52 .long m_read16_rom0 @ 0x000000 - 0x07FFFF\r
53 .long m_read16_rom1 @ 0x080000 - 0x0FFFFF\r
54 .long m_read16_rom2 @ 0x100000 - 0x17FFFF\r
55 .long m_read16_rom3 @ 0x180000 - 0x1FFFFF\r
56 .long m_read16_rom4 @ 0x200000 - 0x27FFFF\r
57 .long m_read16_rom5 @ 0x280000 - 0x2FFFFF\r
58 .long m_read16_rom6 @ 0x300000 - 0x37FFFF\r
59 .long m_read16_rom7 @ 0x380000 - 0x3FFFFF\r
60 .long m_read16_rom8 @ 0x400000 - 0x47FFFF\r
61 .long m_read16_rom9 @ 0x480000 - 0x4FFFFF\r
62 .long m_read16_romA @ 0x500000 - 0x57FFFF\r
63 .long m_read16_romB @ 0x580000 - 0x5FFFFF\r
64 .long m_read16_romC @ 0x600000 - 0x67FFFF\r
65 .long m_read16_romD @ 0x680000 - 0x6FFFFF\r
66 .long m_read16_romE @ 0x700000 - 0x77FFFF\r
67 .long m_read16_romF @ 0x780000 - 0x7FFFFF\r
29a95187 68 .long m_read16_rom10 @ 0x800000 - 0x87FFFF\r
69 .long m_read16_rom11 @ 0x880000 - 0x8FFFFF\r
70 .long m_read16_rom12 @ 0x900000 - 0x97FFFF\r
71 .long m_read16_rom13 @ 0x980000 - 0x9FFFFF\r
cc68a136 72 .long m_read16_misc @ 0xA00000 - 0xA7FFFF\r
73 .long m_read_null @ 0xA80000 - 0xAFFFFF\r
74 .long m_read_null @ 0xB00000 - 0xB7FFFF\r
75 .long m_read_null @ 0xB80000 - 0xBFFFFF\r
76 .long m_read16_vdp @ 0xC00000 - 0xC7FFFF\r
7969166e 77 .long m_read16_vdp @ 0xC80000 - 0xCFFFFF\r
78 .long m_read16_vdp @ 0xD00000 - 0xD7FFFF\r
79 .long m_read16_vdp @ 0xD80000 - 0xDFFFFF\r
cc68a136 80 .long m_read16_ram @ 0xE00000 - 0xE7FFFF\r
81 .long m_read16_ram @ 0xE80000 - 0xEFFFFF\r
82 .long m_read16_ram @ 0xF00000 - 0xF7FFFF\r
83 .long m_read16_ram @ 0xF80000 - 0xFFFFFF\r
84\r
85m_read32_def_table:\r
86 .long m_read32_rom0 @ 0x000000 - 0x07FFFF\r
87 .long m_read32_rom1 @ 0x080000 - 0x0FFFFF\r
88 .long m_read32_rom2 @ 0x100000 - 0x17FFFF\r
89 .long m_read32_rom3 @ 0x180000 - 0x1FFFFF\r
90 .long m_read32_rom4 @ 0x200000 - 0x27FFFF\r
91 .long m_read32_rom5 @ 0x280000 - 0x2FFFFF\r
92 .long m_read32_rom6 @ 0x300000 - 0x37FFFF\r
93 .long m_read32_rom7 @ 0x380000 - 0x3FFFFF\r
94 .long m_read32_rom8 @ 0x400000 - 0x47FFFF\r
95 .long m_read32_rom9 @ 0x480000 - 0x4FFFFF\r
96 .long m_read32_romA @ 0x500000 - 0x57FFFF\r
97 .long m_read32_romB @ 0x580000 - 0x5FFFFF\r
98 .long m_read32_romC @ 0x600000 - 0x67FFFF\r
99 .long m_read32_romD @ 0x680000 - 0x6FFFFF\r
100 .long m_read32_romE @ 0x700000 - 0x77FFFF\r
101 .long m_read32_romF @ 0x780000 - 0x7FFFFF\r
29a95187 102 .long m_read32_rom10 @ 0x800000 - 0x87FFFF\r
103 .long m_read32_rom11 @ 0x880000 - 0x8FFFFF\r
104 .long m_read32_rom12 @ 0x900000 - 0x97FFFF\r
105 .long m_read32_rom13 @ 0x980000 - 0x9FFFFF\r
cc68a136 106 .long m_read32_misc @ 0xA00000 - 0xA7FFFF\r
107 .long m_read_null @ 0xA80000 - 0xAFFFFF\r
108 .long m_read_null @ 0xB00000 - 0xB7FFFF\r
109 .long m_read_null @ 0xB80000 - 0xBFFFFF\r
110 .long m_read32_vdp @ 0xC00000 - 0xC7FFFF\r
7969166e 111 .long m_read32_vdp @ 0xC80000 - 0xCFFFFF\r
112 .long m_read32_vdp @ 0xD00000 - 0xD7FFFF\r
113 .long m_read32_vdp @ 0xD80000 - 0xDFFFFF\r
cc68a136 114 .long m_read32_ram @ 0xE00000 - 0xE7FFFF\r
115 .long m_read32_ram @ 0xE80000 - 0xEFFFFF\r
116 .long m_read32_ram @ 0xF00000 - 0xF7FFFF\r
117 .long m_read32_ram @ 0xF80000 - 0xFFFFFF\r
118\r
119\r
120@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r
121\r
122.bss\r
3ec29f01 123.align 4\r
cc68a136 124@.section .bss, "brw"\r
125@.data\r
126\r
127@ used tables\r
128m_read8_table:\r
129 .skip 32*4\r
130\r
131m_read16_table:\r
132 .skip 32*4\r
133\r
134m_read32_table:\r
135 .skip 32*4\r
136\r
137\r
138@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r
139\r
140.text\r
3ec29f01 141.align 4\r
cc68a136 142\r
143.global PicoMemReset\r
144.global PicoRead8\r
145.global PicoRead16\r
146.global PicoRead32\r
e5503e2f 147.global PicoWrite8\r
cc68a136 148.global PicoWriteRomHW_SSF2\r
e5503e2f 149.global m_m68k_read8_misc\r
150.global m_m68k_write8_misc\r
cc68a136 151\r
152\r
153PicoMemReset:\r
154 ldr r12,=(Pico+0x22204)\r
155 ldr r12,[r12] @ romsize\r
156 add r12,r12,#0x80000\r
157 sub r12,r12,#1\r
158 mov r12,r12,lsr #19\r
159\r
160 ldr r0, =m_read8_table\r
161 ldr r1, =m_read8_def_table\r
162 mov r2, #32\r
1631:\r
164 ldr r3, [r1], #4\r
165 str r3, [r0], #4\r
166 subs r2, r2, #1\r
167 bne 1b\r
168\r
169 ldr r0, =m_read16_table\r
170 ldr r1, =m_read16_def_table\r
171 mov r2, #32\r
1721:\r
173 subs r2, r2, #1\r
174 ldr r3, [r1], #4\r
175 str r3, [r0], #4\r
176 bne 1b\r
177\r
178 ldr r0, =m_read32_table\r
179 ldr r1, =m_read32_def_table\r
180 mov r2, #32\r
1811:\r
182 subs r2, r2, #1\r
183 ldr r3, [r1], #4\r
184 str r3, [r0], #4\r
185 bne 1b\r
186\r
187 @ update memhandlers according to ROM size\r
188 ldr r1, =m_read8_above_rom\r
189 ldr r0, =m_read8_table\r
3ec29f01 190 mov r2, #20\r
cc68a136 1911:\r
192 sub r2, r2, #1\r
193 cmp r2, r12\r
194 blt 2f\r
195 cmp r2, #4\r
196 beq 1b @ do not touch the SRAM area\r
197 str r1, [r0, r2, lsl #2]\r
198 b 1b\r
1992:\r
200 ldr r1, =m_read16_above_rom\r
201 ldr r0, =m_read16_table\r
3ec29f01 202 mov r2, #20\r
cc68a136 2031:\r
204 sub r2, r2, #1\r
205 cmp r2, r12\r
206 blt 2f\r
207 cmp r2, #4\r
208 beq 1b\r
209 str r1, [r0, r2, lsl #2]\r
210 b 1b\r
2112:\r
212 ldr r1, =m_read32_above_rom\r
213 ldr r0, =m_read32_table\r
3ec29f01 214 mov r2, #20\r
cc68a136 2151:\r
216 sub r2, r2, #1\r
217 cmp r2, r12\r
218 blt 2f\r
219 cmp r2, #4\r
220 beq 1b\r
221 str r1, [r0, r2, lsl #2]\r
222 b 1b\r
2232:\r
224 bx lr\r
225\r
226.pool\r
227\r
228@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r
229\r
230PicoRead8: @ u32 a\r
231 ldr r2, =m_read8_table\r
232 bic r0, r0, #0xff000000\r
233 and r1, r0, #0x00f80000\r
234 ldr pc, [r2, r1, lsr #17]\r
235\r
236PicoRead16: @ u32 a\r
237 ldr r2, =m_read16_table\r
238 bic r0, r0, #0xff000000\r
239 and r1, r0, #0x00f80000\r
240 ldr pc, [r2, r1, lsr #17]\r
241\r
242PicoRead32: @ u32 a\r
243 ldr r2, =m_read32_table\r
244 bic r0, r0, #0xff000000\r
245 and r1, r0, #0x00f80000\r
246 ldr pc, [r2, r1, lsr #17]\r
247\r
248.pool\r
249\r
250@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r
251\r
252m_read_null:\r
253 mov r0, #0\r
254 bx lr\r
255\r
256\r
257.macro m_read8_rom sect\r
258 ldr r1, =(Pico+0x22200)\r
259 bic r0, r0, #0xf80000\r
260 ldr r1, [r1]\r
261.if \sect\r
262 orr r0, r0, #0x080000*\sect\r
263.endif\r
264 eor r0, r0, #1\r
265 ldrb r0, [r1, r0]\r
266 bx lr\r
267.endm\r
268\r
269\r
270m_read8_rom0: @ 0x000000 - 0x07ffff\r
271 m_read8_rom 0\r
272\r
273m_read8_rom1: @ 0x080000 - 0x0fffff\r
274 m_read8_rom 1\r
275\r
276m_read8_rom2: @ 0x100000 - 0x17ffff\r
277 m_read8_rom 2\r
278\r
279m_read8_rom3: @ 0x180000 - 0x1fffff\r
280 m_read8_rom 3\r
281\r
282m_read8_rom4: @ 0x200000 - 0x27ffff, SRAM area\r
283 ldr r2, =(SRam)\r
284 ldr r3, =(Pico+0x22200)\r
285 ldr r1, [r2, #8] @ SRam.end\r
286 bic r0, r0, #0xf80000\r
287 orr r0, r0, #0x200000\r
288 cmp r0, r1\r
289 bgt m_read8_nosram\r
7969166e 290 ldr r1, [r2, #4] @ SRam.start\r
cc68a136 291 cmp r0, r1\r
292 blt m_read8_nosram\r
7969166e 293 ldrb r1, [r3, #0x11] @ Pico.m.sram_reg\r
294 tst r1, #5\r
295 bne SRAMRead\r
cc68a136 296m_read8_nosram:\r
7969166e 297 ldr r1, [r3, #4] @ romsize\r
cc68a136 298 cmp r0, r1\r
299 movgt r0, #0\r
300 bxgt lr @ bad location\r
301 ldr r1, [r3]\r
302 eor r0, r0, #1\r
303 ldrb r0, [r1, r0]\r
304 bx lr\r
305\r
306m_read8_rom5: @ 0x280000 - 0x2fffff\r
307 m_read8_rom 5\r
308\r
309m_read8_rom6: @ 0x300000 - 0x37ffff\r
310 m_read8_rom 6\r
311\r
312m_read8_rom7: @ 0x380000 - 0x3fffff\r
313 m_read8_rom 7\r
314\r
315m_read8_rom8: @ 0x400000 - 0x47ffff\r
316 m_read8_rom 8\r
317\r
318m_read8_rom9: @ 0x480000 - 0x4fffff\r
319 m_read8_rom 9\r
320\r
cc68a136 321m_read8_romA: @ 0x500000 - 0x57ffff\r
322 m_read8_rom 0xA\r
323\r
324m_read8_romB: @ 0x580000 - 0x5fffff\r
325 m_read8_rom 0xB\r
326\r
327m_read8_romC: @ 0x600000 - 0x67ffff\r
328 m_read8_rom 0xC\r
329\r
330m_read8_romD: @ 0x680000 - 0x6fffff\r
331 m_read8_rom 0xD\r
332\r
333m_read8_romE: @ 0x700000 - 0x77ffff\r
334 m_read8_rom 0xE\r
335\r
336m_read8_romF: @ 0x780000 - 0x7fffff\r
337 m_read8_rom 0xF\r
338\r
29a95187 339m_read8_rom10: @ 0x800000 - 0x87ffff\r
340 m_read8_rom 0x10\r
341\r
342m_read8_rom11: @ 0x880000 - 0x8fffff\r
343 m_read8_rom 0x11\r
344\r
345m_read8_rom12: @ 0x900000 - 0x97ffff\r
346 m_read8_rom 0x12\r
347\r
348m_read8_rom13: @ 0x980000 - 0x9fffff\r
349 m_read8_rom 0x13\r
350\r
e5503e2f 351\r
352m_m68k_read8_misc:\r
cc68a136 353m_read8_misc:\r
e5503e2f 354 bic r2, r0, #0x001f @ most commonly we get i/o port read,\r
355 cmp r2, #0xa10000 @ so check for it first\r
356 bne m_read8_misc2\r
357m_read8_misc_io:\r
358 ands r0, r0, #0x1e\r
359 beq m_read8_misc_hwreg\r
360 cmp r0, #4\r
e5503e2f 361 movlt r0, #0\r
362 moveq r0, #1\r
bf537655 363 ble PadRead\r
e5503e2f 364 ldr r3, =(Pico+0x22000)\r
365 mov r0, r0, lsr #1 @ other IO ports (Pico.ioports[a])\r
366 ldrb r0, [r3, r0]\r
367 bx lr\r
368\r
369m_read8_misc_hwreg:\r
370 ldr r3, =(Pico+0x22200)\r
371 ldrb r0, [r3, #0x0f] @ Pico.m.hardware\r
372 bx lr\r
373\r
374m_read8_misc2:\r
375 mov r2, #0xa10000 @ games also like to poll busreq,\r
376 orr r2, r2, #0x001100 @ so we'll try it now\r
377 cmp r0, r2\r
bf537655 378 beq z80ReadBusReq\r
e5503e2f 379\r
380 and r2, r0, #0xff0000 @ finally it might be\r
381 cmp r2, #0xa00000 @ z80 area\r
382 bne m_read8_misc3\r
383 tst r0, #0x4000\r
bf537655 384 beq z80Read8 @ z80 RAM\r
e5503e2f 385 and r2, r0, #0x6000\r
386 cmp r2, #0x4000\r
387 mvnne r0, #0\r
388 bxne lr @ invalid\r
e5503e2f 389 ldr r1, =PicoOpt\r
390 ldr r1, [r1]\r
391 tst r1, #1\r
43e6eaad 392 bne ym2612_read_local_68k\r
e5503e2f 393\r
394m_read8_fake_ym2612:\r
395 ldr r3, =(Pico+0x22200)\r
396 ldrb r0, [r3, #8] @ Pico.m.rotate\r
397 add r1, r0, #1\r
398 strb r1, [r3, #8]\r
399 and r0, r0, #3\r
400 bx lr\r
401\r
402m_read8_misc3:\r
403 @ if everything else fails, use generic handler\r
cc68a136 404 stmfd sp!,{r0,lr}\r
405 bic r0, r0, #1\r
406 mov r1, #8\r
407 bl OtherRead16\r
408 ldmfd sp!,{r1,lr}\r
409 tst r1, #1\r
410 moveq r0, r0, lsr #8\r
411 bx lr\r
412\r
e5503e2f 413\r
cc68a136 414m_read8_vdp:\r
415 tst r0, #0x70000\r
416 tsteq r0, #0x000e0\r
417 bxne lr @ invalid read\r
418 stmfd sp!,{r0,lr}\r
419 bic r0, r0, #1\r
420 bl PicoVideoRead\r
421 ldmfd sp!,{r1,lr}\r
422 tst r1, #1\r
423 moveq r0, r0, lsr #8\r
424 bx lr\r
425\r
426m_read8_ram:\r
427 ldr r1, =Pico\r
428 bic r0, r0, #0xff0000\r
429 eor r0, r0, #1\r
430 ldrb r0, [r1, r0]\r
431 bx lr\r
432\r
433m_read8_above_rom:\r
1dceadae 434 @ might still be SRam (Micro Machines, HardBall '95)\r
435 ldr r2, =(SRam)\r
436 ldr r3, =(Pico+0x22200)\r
437 ldr r1, [r2, #8] @ SRam.end\r
438 cmp r0, r1\r
439 bgt m_read8_ar_nosram\r
440 ldr r1, [r2, #4] @ SRam.start\r
441 cmp r0, r1\r
442 blt m_read8_ar_nosram\r
443 ldrb r1, [r3, #0x11] @ Pico.m.sram_reg\r
444 tst r1, #5\r
445 bne SRAMRead\r
446m_read8_ar_nosram:\r
0ffefdb8 447 ldr r2, =PicoRead16Hook\r
cc68a136 448 stmfd sp!,{r0,lr}\r
0ffefdb8 449 ldr r2, [r2]\r
cc68a136 450 bic r0, r0, #1\r
451 mov r1, #8\r
0ffefdb8 452 mov lr, pc\r
453 bx r2\r
cc68a136 454 ldmfd sp!,{r1,lr}\r
455 tst r1, #1\r
456 moveq r0, r0, lsr #8\r
457 bx lr\r
458\r
459.pool\r
460\r
461@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r
462\r
463.macro m_read16_rom sect\r
464 ldr r1, =(Pico+0x22200)\r
465 bic r0, r0, #0xf80000\r
466 ldr r1, [r1]\r
467 bic r0, r0, #1\r
468.if \sect\r
469 orr r0, r0, #0x080000*\sect\r
470.endif\r
471 ldrh r0, [r1, r0]\r
472 bx lr\r
473.endm\r
474\r
475\r
476m_read16_rom0: @ 0x000000 - 0x07ffff\r
477 m_read16_rom 0\r
478\r
479m_read16_rom1: @ 0x080000 - 0x0fffff\r
480 m_read16_rom 1\r
481\r
482m_read16_rom2: @ 0x100000 - 0x17ffff\r
483 m_read16_rom 2\r
484\r
485m_read16_rom3: @ 0x180000 - 0x1fffff\r
486 m_read16_rom 3\r
487\r
488m_read16_rom4: @ 0x200000 - 0x27ffff, SRAM area (NBA Live 95)\r
489 ldr r2, =(SRam)\r
490 ldr r3, =(Pico+0x22200)\r
491 ldr r1, [r2, #8] @ SRam.end\r
492 bic r0, r0, #0xf80000\r
493 bic r0, r0, #1\r
494 orr r0, r0, #0x200000\r
495 cmp r0, r1\r
496 bgt m_read16_nosram\r
7969166e 497 ldr r1, [r2, #4] @ SRam.start\r
cc68a136 498 cmp r0, r1\r
499 blt m_read16_nosram\r
7969166e 500 ldrb r1, [r3, #0x11] @ Pico.m.sram_reg\r
501 tst r1, #5\r
502 beq m_read16_nosram\r
503 stmfd sp!,{lr}\r
9dc09829 504 bl SRAMRead16\r
7969166e 505 ldmfd sp!,{pc}\r
cc68a136 506m_read16_nosram:\r
7969166e 507 ldr r1, [r3, #4] @ romsize\r
cc68a136 508 cmp r0, r1\r
509 movgt r0, #0\r
510 bxgt lr @ bad location\r
511 ldr r1, [r3] @ 1ci\r
512 ldrh r0, [r1, r0]\r
513 bx lr\r
514\r
515m_read16_rom5: @ 0x280000 - 0x2fffff\r
516 m_read16_rom 5\r
517\r
518m_read16_rom6: @ 0x300000 - 0x37ffff\r
519 m_read16_rom 6\r
520\r
521m_read16_rom7: @ 0x380000 - 0x3fffff\r
522 m_read16_rom 7\r
523\r
524m_read16_rom8: @ 0x400000 - 0x47ffff\r
525 m_read16_rom 8\r
526\r
527m_read16_rom9: @ 0x480000 - 0x4fffff\r
528 m_read16_rom 9\r
529\r
cc68a136 530m_read16_romA: @ 0x500000 - 0x57ffff\r
531 m_read16_rom 0xA\r
532\r
533m_read16_romB: @ 0x580000 - 0x5fffff\r
534 m_read16_rom 0xB\r
535\r
536m_read16_romC: @ 0x600000 - 0x67ffff\r
537 m_read16_rom 0xC\r
538\r
539m_read16_romD: @ 0x680000 - 0x6fffff\r
540 m_read16_rom 0xD\r
541\r
542m_read16_romE: @ 0x700000 - 0x77ffff\r
543 m_read16_rom 0xE\r
544\r
545m_read16_romF: @ 0x780000 - 0x7fffff\r
546 m_read16_rom 0xF\r
547\r
29a95187 548m_read16_rom10: @ 0x800000 - 0x87ffff\r
549 m_read16_rom 0x10\r
550\r
551m_read16_rom11: @ 0x880000 - 0x8fffff\r
552 m_read16_rom 0x11\r
553\r
554m_read16_rom12: @ 0x900000 - 0x97ffff\r
555 m_read16_rom 0x12\r
556\r
557m_read16_rom13: @ 0x980000 - 0x9fffff\r
558 m_read16_rom 0x13\r
559\r
cc68a136 560m_read16_misc:\r
cc68a136 561 bic r0, r0, #1\r
4ff2d527 562 mov r1, #16\r
563 b OtherRead16\r
cc68a136 564\r
565m_read16_vdp:\r
7969166e 566 tst r0, #0x70000 @ if ((a&0xe700e0)==0xc00000)\r
cc68a136 567 tsteq r0, #0x000e0\r
568 bxne lr @ invalid read\r
cc68a136 569 bic r0, r0, #1\r
4ff2d527 570 b PicoVideoRead\r
cc68a136 571\r
572m_read16_ram:\r
573 ldr r1, =Pico\r
574 bic r0, r0, #0xff0000\r
575 bic r0, r0, #1\r
576 ldrh r0, [r1, r0]\r
577 bx lr\r
578\r
579m_read16_above_rom:\r
1dceadae 580 @ might still be SRam\r
581 ldr r2, =(SRam)\r
582 ldr r3, =(Pico+0x22200)\r
583 ldr r1, [r2, #8] @ SRam.end\r
cc68a136 584 bic r0, r0, #1\r
1dceadae 585 cmp r0, r1\r
586 bgt m_read16_ar_nosram\r
587 ldr r1, [r2, #4] @ SRam.start\r
588 cmp r0, r1\r
589 blt m_read16_ar_nosram\r
590 ldrb r1, [r3, #0x11] @ Pico.m.sram_reg\r
591 tst r1, #5\r
592 beq m_read16_ar_nosram\r
593 stmfd sp!,{lr}\r
9dc09829 594 bl SRAMRead16\r
1dceadae 595 ldmfd sp!,{pc}\r
596m_read16_ar_nosram:\r
0ffefdb8 597 ldr r2, =PicoRead16Hook\r
598 ldr r2, [r2]\r
4ff2d527 599 mov r1, #16\r
0ffefdb8 600 bx r2\r
cc68a136 601\r
602.pool\r
603\r
604@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r
605\r
606.macro m_read32_rom sect\r
607 ldr r1, =(Pico+0x22200)\r
608 bic r0, r0, #0xf80000\r
609 ldr r1, [r1]\r
610 bic r0, r0, #1\r
611.if \sect\r
612 orr r0, r0, #0x080000*\sect\r
613.endif\r
614 ldrh r0, [r1, r0]!\r
615 ldrh r1, [r1, #2] @ 1ci\r
616 orr r0, r1, r0, lsl #16\r
617 bx lr\r
618.endm\r
619\r
620\r
621m_read32_rom0: @ 0x000000 - 0x07ffff\r
622 m_read32_rom 0\r
623\r
624m_read32_rom1: @ 0x080000 - 0x0fffff\r
625 m_read32_rom 1\r
626\r
627m_read32_rom2: @ 0x100000 - 0x17ffff\r
628 m_read32_rom 2\r
629\r
630m_read32_rom3: @ 0x180000 - 0x1fffff\r
631 m_read32_rom 3\r
632\r
633m_read32_rom4: @ 0x200000 - 0x27ffff, SRAM area (does any game do long reads?)\r
634 ldr r2, =(SRam)\r
635 ldr r3, =(Pico+0x22200)\r
636 ldr r1, [r2, #8] @ SRam.end\r
637 bic r0, r0, #0xf80000\r
638 bic r0, r0, #1\r
639 orr r0, r0, #0x200000\r
640 cmp r0, r1\r
641 bgt m_read32_nosram\r
7969166e 642 ldr r1, [r2, #4] @ SRam.start\r
cc68a136 643 cmp r0, r1\r
644 blt m_read32_nosram\r
7969166e 645 ldrb r1, [r3, #0x11] @ Pico.m.sram_reg\r
646 tst r1, #5\r
647 beq m_read32_nosram\r
648 stmfd sp!,{r0,lr}\r
9dc09829 649 bl SRAMRead16\r
7969166e 650 ldmfd sp!,{r1,lr}\r
651 stmfd sp!,{r0,lr}\r
652 add r0, r1, #2\r
9dc09829 653 bl SRAMRead16\r
7969166e 654 ldmfd sp!,{r1,lr}\r
3ec29f01 655 orr r0, r0, r1, lsl #16\r
cc68a136 656 bx lr\r
657m_read32_nosram:\r
7969166e 658 ldr r1, [r3, #4] @ romsize\r
cc68a136 659 cmp r0, r1\r
660 movgt r0, #0\r
661 bxgt lr @ bad location\r
662 ldr r1, [r3] @ (1ci)\r
663 ldrh r0, [r1, r0]!\r
664 ldrh r1, [r1, #2] @ (2ci)\r
665 orr r0, r1, r0, lsl #16\r
666 bx lr\r
667\r
668m_read32_rom5: @ 0x280000 - 0x2fffff\r
669 m_read32_rom 5\r
670\r
671m_read32_rom6: @ 0x300000 - 0x37ffff\r
672 m_read32_rom 6\r
673\r
674m_read32_rom7: @ 0x380000 - 0x3fffff\r
675 m_read32_rom 7\r
676\r
677m_read32_rom8: @ 0x400000 - 0x47ffff\r
678 m_read32_rom 8\r
679\r
680m_read32_rom9: @ 0x480000 - 0x4fffff\r
681 m_read32_rom 9\r
682\r
cc68a136 683m_read32_romA: @ 0x500000 - 0x57ffff\r
684 m_read32_rom 0xA\r
685\r
686m_read32_romB: @ 0x580000 - 0x5fffff\r
687 m_read32_rom 0xB\r
688\r
689m_read32_romC: @ 0x600000 - 0x67ffff\r
690 m_read32_rom 0xC\r
691\r
692m_read32_romD: @ 0x680000 - 0x6fffff\r
693 m_read32_rom 0xD\r
694\r
695m_read32_romE: @ 0x700000 - 0x77ffff\r
696 m_read32_rom 0xE\r
697\r
698m_read32_romF: @ 0x780000 - 0x7fffff\r
699 m_read32_rom 0xF\r
700\r
29a95187 701m_read32_rom10: @ 0x800000 - 0x87ffff\r
702 m_read32_rom 0x10\r
703\r
704m_read32_rom11: @ 0x880000 - 0x8fffff\r
705 m_read32_rom 0x11\r
706\r
707m_read32_rom12: @ 0x900000 - 0x97ffff\r
708 m_read32_rom 0x12\r
709\r
710m_read32_rom13: @ 0x980000 - 0x9fffff\r
711 m_read32_rom 0x13\r
712\r
cc68a136 713m_read32_misc:\r
714 bic r0, r0, #1\r
715 stmfd sp!,{r0,lr}\r
716 mov r1, #32\r
717 bl OtherRead16\r
718 mov r1, r0\r
719 ldmfd sp!,{r0}\r
720 stmfd sp!,{r1}\r
721 add r0, r0, #2\r
722 mov r1, #32\r
723 bl OtherRead16\r
724 ldmfd sp!,{r1,lr}\r
725 orr r0, r0, r1, lsl #16\r
726 bx lr\r
727\r
728m_read32_vdp:\r
729 tst r0, #0x70000\r
730 tsteq r0, #0x000e0\r
731 bxne lr @ invalid read\r
732 bic r0, r0, #1\r
4ff2d527 733 add r1, r0, #2\r
734 stmfd sp!,{r1,lr}\r
cc68a136 735 bl PicoVideoRead\r
4ff2d527 736 swp r0, r0, [sp]\r
cc68a136 737 bl PicoVideoRead\r
738 ldmfd sp!,{r1,lr}\r
739 orr r0, r0, r1, lsl #16\r
740 bx lr\r
741\r
742m_read32_ram:\r
743 ldr r1, =Pico\r
744 bic r0, r0, #0xff0000\r
745 bic r0, r0, #1\r
746 ldrh r0, [r1, r0]!\r
747 ldrh r1, [r1, #2] @ 2ci\r
748 orr r0, r1, r0, lsl #16\r
749 bx lr\r
750\r
751m_read32_above_rom:\r
0ffefdb8 752 ldr r2, =PicoRead16Hook\r
cc68a136 753 bic r0, r0, #1\r
0ffefdb8 754 ldr r2, [r2]\r
cc68a136 755 mov r1, #32\r
0ffefdb8 756 stmfd sp!,{r0,r2,lr}\r
757 mov lr, pc\r
758 bx r2\r
cc68a136 759 mov r1, r0\r
0ffefdb8 760 ldmfd sp!,{r0,r2}\r
cc68a136 761 stmfd sp!,{r1}\r
762 add r0, r0, #2\r
763 mov r1, #32\r
0ffefdb8 764 mov lr, pc\r
765 bx r2\r
cc68a136 766 ldmfd sp!,{r1,lr}\r
767 orr r0, r0, r1, lsl #16\r
768 bx lr\r
769\r
770.pool\r
771\r
772@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r
773\r
774PicoWriteRomHW_SSF2: @ u32 a, u32 d\r
775 and r0, r0, #0xe\r
776 movs r0, r0, lsr #1\r
777 bne pwr_banking\r
778\r
779 @ sram register\r
780 ldr r2, =(Pico+0x22211) @ Pico.m.sram_reg\r
721cd396 781 ldrb r0, [r2]\r
cc68a136 782 and r1, r1, #3\r
721cd396 783 bic r0, r0, #3\r
784 orr r0, r0, r1\r
785 strb r0, [r2]\r
cc68a136 786 bx lr\r
787\r
788pwr_banking:\r
789 and r1, r1, #0x1f\r
790\r
791 ldr r3, =m_read8_def_table\r
792 ldr r2, =m_read8_table\r
793 ldr r12, [r3, r1, lsl #2]\r
794 str r12, [r2, r0, lsl #2]\r
795\r
796 ldr r3, =m_read16_def_table\r
797 ldr r2, =m_read16_table\r
798 ldr r12, [r3, r1, lsl #2]\r
799 str r12, [r2, r0, lsl #2]\r
800\r
801 ldr r3, =m_read32_def_table\r
802 ldr r2, =m_read32_table\r
803 ldr r12, [r3, r1, lsl #2]\r
804 str r12, [r2, r0, lsl #2]\r
805 \r
806 bx lr\r
721cd396 807\r
e5503e2f 808@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r
809\r
810@ Here we only handle most often used locations,\r
811@ everything else is passed to generic handlers\r
812\r
813PicoWrite8: @ u32 a, u8 d\r
814 bic r0, r0, #0xff000000\r
815 and r2, r0, #0x00e00000\r
816 cmp r2, #0x00e00000 @ RAM?\r
817 ldr r3, =Pico\r
818 biceq r0, r0, #0x00ff0000\r
819 eoreq r0, r0, #1\r
820 streqb r1, [r3, r0]\r
821 bxeq lr\r
822\r
823m_m68k_write8_misc:\r
824 bic r2, r0, #0x1f @ most commonly we get i/o port write,\r
825 cmp r2, #0xa10000 @ so check for it first\r
826 bne m_write8_misc2\r
827m_write8_io:\r
828 ldr r2, =PicoOpt\r
829 and r0, r0, #0x1e\r
830 ldr r2, [r2]\r
831 ldr r3, =(Pico+0x22000) @ Pico.ioports\r
832 tst r2, #0x20 @ 6 button pad?\r
833 streqb r1, [r3, r0, lsr #1]\r
834 bxeq lr\r
835 cmp r0, #2\r
836 cmpne r0, #4\r
837 bne m_write8_io_done @ not likely to happen\r
838 add r2, r3, #0x200 @ Pico+0x22200\r
839 mov r12,#0\r
840 cmp r0, #2\r
841 streqb r12,[r2,#0x18]\r
842 strneb r12,[r2,#0x19] @ Pico.m.padDelay[i] = 0\r
843 tst r1, #0x40 @ TH\r
844 beq m_write8_io_done\r
845 ldrb r12,[r3, r0, lsr #1]\r
846 tst r12,#0x40\r
847 bne m_write8_io_done\r
848 cmp r0, #2\r
849 ldreqb r12,[r2,#0x0a]\r
850 ldrneb r12,[r2,#0x0b] @ Pico.m.padTHPhase\r
851 add r12,r12,#1\r
852 streqb r12,[r2,#0x0a]\r
853 strneb r12,[r2,#0x0b] @ Pico.m.padTHPhase\r
854m_write8_io_done:\r
855 strb r1, [r3, r0, lsr #1]\r
856 bx lr\r
857\r
858\r
859m_write8_misc2:\r
860 and r2, r0, #0xff0000\r
861 cmp r2, #0xa00000 @ z80 area?\r
862 bne m_write8_not_z80\r
863 tst r0, #0x4000\r
864 bne m_write8_z80_not_ram\r
865 ldr r3, =(Pico+0x20000) @ Pico.zram\r
866 add r2, r3, #0x02200 @ Pico+0x22200\r
867 ldrb r2, [r2, #9] @ Pico.m.z80Run\r
868 bic r0, r0, #0xff0000\r
869 bic r0, r0, #0x00e000\r
870 tst r2, #1\r
871 streqb r1, [r3, r0] @ zram\r
872 bx lr\r
873\r
874m_write8_z80_not_ram:\r
875 and r2, r0, #0x6000\r
876 cmp r2, #0x4000\r
877 bne m_write8_z80_not_ym2612\r
4b9c5888 878 ldr r3, =PicoOpt\r
e5503e2f 879 and r0, r0, #3\r
4b9c5888 880 ldr r3, [r3]\r
881 mov r2, #0 @ is_from_z80 = 0\r
882 tst r3, #1\r
e5503e2f 883 bxeq lr\r
884 stmfd sp!,{lr}\r
4b9c5888 885 and r1, r1, #0xff\r
886 bl ym2612_write_local\r
e5503e2f 887 ldr r2, =emustatus\r
888 ldmfd sp!,{lr}\r
889 ldr r1, [r2]\r
471484e4 890 and r0, r0, #1\r
891 orr r1, r0, r1\r
4b9c5888 892 str r1, [r2] @ emustatus|=ym2612_write_local(a&3, d);\r
e5503e2f 893 bx lr\r
894\r
895m_write8_z80_not_ym2612: @ not too likely\r
896 mov r2, r0, lsl #17\r
897 bic r2, r2, #6<<17\r
898 mov r3, #0x7f00\r
899 orr r3, r3, #0x0011\r
900 cmp r3, r2, lsr #17 @ psg @ z80 area?\r
901 beq m_write8_psg\r
902 and r2, r0, #0x7f00\r
903 cmp r2, #0x6000 @ bank register?\r
904 bxne lr @ invalid write\r
905\r
906m_write8_z80_bank_reg:\r
907 ldr r3, =(Pico+0x22208) @ Pico.m\r
908 ldrh r2, [r3, #0x0a]\r
4b9c5888 909 mov r1, r1, lsl #8\r
e5503e2f 910 orr r2, r1, r2, lsr #1\r
911 bic r2, r2, #0xfe00\r
912 strh r2, [r3, #0x0a]\r
913 bx lr\r
914\r
915\r
916m_write8_not_z80:\r
917 and r2, r0, #0xe70000\r
918 cmp r2, #0xc00000 @ VDP area?\r
bf537655 919 bne OtherWrite8 @ passthrough\r
e5503e2f 920 and r2, r0, #0xf9\r
921 cmp r2, #0x11\r
bf537655 922 bne OtherWrite8\r
e5503e2f 923m_write8_psg:\r
924 ldr r2, =PicoOpt\r
4b9c5888 925 and r0, r1, #0xff\r
e5503e2f 926 ldr r2, [r2]\r
927 tst r2, #2\r
928 bxeq lr\r
bf537655 929 b SN76496Write\r
e5503e2f 930\r
fast MegaDrive/MegaCD/32X emulator