3ec29f01 |
1 | # vim:filetype=mips |
2 | |
3 | # memory handlers with banking support for SSF II - The New Challengers |
4 | # mostly based on Gens code |
5 | |
6 | # (c) Copyright 2007, Grazvydas "notaz" Ignotas |
7 | # All Rights Reserved |
8 | |
9 | |
10 | .set noreorder |
11 | .set noat |
12 | |
13 | .text |
14 | .align 4 |
15 | |
16 | # default jump tables |
17 | |
18 | m_read8_def_table: |
19 | .long m_read8_rom0 # 0x000000 - 0x07FFFF |
20 | .long m_read8_rom1 # 0x080000 - 0x0FFFFF |
21 | .long m_read8_rom2 # 0x100000 - 0x17FFFF |
22 | .long m_read8_rom3 # 0x180000 - 0x1FFFFF |
23 | .long m_read8_rom4 # 0x200000 - 0x27FFFF |
24 | .long m_read8_rom5 # 0x280000 - 0x2FFFFF |
25 | .long m_read8_rom6 # 0x300000 - 0x37FFFF |
26 | .long m_read8_rom7 # 0x380000 - 0x3FFFFF |
27 | .long m_read8_rom8 # 0x400000 - 0x47FFFF - for all those large ROM hacks |
28 | .long m_read8_rom9 # 0x480000 - 0x4FFFFF |
29 | .long m_read8_romA # 0x500000 - 0x57FFFF |
30 | .long m_read8_romB # 0x580000 - 0x5FFFFF |
31 | .long m_read8_romC # 0x600000 - 0x67FFFF |
32 | .long m_read8_romD # 0x680000 - 0x6FFFFF |
33 | .long m_read8_romE # 0x700000 - 0x77FFFF |
34 | .long m_read8_romF # 0x780000 - 0x7FFFFF |
35 | .long m_read8_rom10 # 0x800000 - 0x87FFFF |
36 | .long m_read8_rom11 # 0x880000 - 0x8FFFFF |
37 | .long m_read8_rom12 # 0x900000 - 0x97FFFF |
38 | .long m_read8_rom13 # 0x980000 - 0x9FFFFF |
39 | .long m_read8_misc # 0xA00000 - 0xA7FFFF |
40 | .long m_read_null # 0xA80000 - 0xAFFFFF |
41 | .long m_read_null # 0xB00000 - 0xB7FFFF |
42 | .long m_read_null # 0xB80000 - 0xBFFFFF |
43 | .long m_read8_vdp # 0xC00000 - 0xC7FFFF |
44 | .long m_read8_vdp # 0xC80000 - 0xCFFFFF |
45 | .long m_read8_vdp # 0xD00000 - 0xD7FFFF |
46 | .long m_read8_vdp # 0xD80000 - 0xDFFFFF |
47 | .long m_read8_ram # 0xE00000 - 0xE7FFFF |
48 | .long m_read8_ram # 0xE80000 - 0xEFFFFF |
49 | .long m_read8_ram # 0xF00000 - 0xF7FFFF |
50 | .long m_read8_ram # 0xF80000 - 0xFFFFFF |
51 | |
52 | m_read16_def_table: |
53 | .long m_read16_rom0 # 0x000000 - 0x07FFFF |
54 | .long m_read16_rom1 # 0x080000 - 0x0FFFFF |
55 | .long m_read16_rom2 # 0x100000 - 0x17FFFF |
56 | .long m_read16_rom3 # 0x180000 - 0x1FFFFF |
57 | .long m_read16_rom4 # 0x200000 - 0x27FFFF |
58 | .long m_read16_rom5 # 0x280000 - 0x2FFFFF |
59 | .long m_read16_rom6 # 0x300000 - 0x37FFFF |
60 | .long m_read16_rom7 # 0x380000 - 0x3FFFFF |
61 | .long m_read16_rom8 # 0x400000 - 0x47FFFF |
62 | .long m_read16_rom9 # 0x480000 - 0x4FFFFF |
63 | .long m_read16_romA # 0x500000 - 0x57FFFF |
64 | .long m_read16_romB # 0x580000 - 0x5FFFFF |
65 | .long m_read16_romC # 0x600000 - 0x67FFFF |
66 | .long m_read16_romD # 0x680000 - 0x6FFFFF |
67 | .long m_read16_romE # 0x700000 - 0x77FFFF |
68 | .long m_read16_romF # 0x780000 - 0x7FFFFF |
69 | .long m_read16_rom10 # 0x800000 - 0x87FFFF |
70 | .long m_read16_rom11 # 0x880000 - 0x8FFFFF |
71 | .long m_read16_rom12 # 0x900000 - 0x97FFFF |
72 | .long m_read16_rom13 # 0x980000 - 0x9FFFFF |
73 | .long m_read16_misc # 0xA00000 - 0xA7FFFF |
74 | .long m_read_null # 0xA80000 - 0xAFFFFF |
75 | .long m_read_null # 0xB00000 - 0xB7FFFF |
76 | .long m_read_null # 0xB80000 - 0xBFFFFF |
77 | .long m_read16_vdp # 0xC00000 - 0xC7FFFF |
78 | .long m_read16_vdp # 0xC80000 - 0xCFFFFF |
79 | .long m_read16_vdp # 0xD00000 - 0xD7FFFF |
80 | .long m_read16_vdp # 0xD80000 - 0xDFFFFF |
81 | .long m_read16_ram # 0xE00000 - 0xE7FFFF |
82 | .long m_read16_ram # 0xE80000 - 0xEFFFFF |
83 | .long m_read16_ram # 0xF00000 - 0xF7FFFF |
84 | .long m_read16_ram # 0xF80000 - 0xFFFFFF |
85 | |
86 | m_read32_def_table: |
87 | .long m_read32_rom0 # 0x000000 - 0x07FFFF |
88 | .long m_read32_rom1 # 0x080000 - 0x0FFFFF |
89 | .long m_read32_rom2 # 0x100000 - 0x17FFFF |
90 | .long m_read32_rom3 # 0x180000 - 0x1FFFFF |
91 | .long m_read32_rom4 # 0x200000 - 0x27FFFF |
92 | .long m_read32_rom5 # 0x280000 - 0x2FFFFF |
93 | .long m_read32_rom6 # 0x300000 - 0x37FFFF |
94 | .long m_read32_rom7 # 0x380000 - 0x3FFFFF |
95 | .long m_read32_rom8 # 0x400000 - 0x47FFFF |
96 | .long m_read32_rom9 # 0x480000 - 0x4FFFFF |
97 | .long m_read32_romA # 0x500000 - 0x57FFFF |
98 | .long m_read32_romB # 0x580000 - 0x5FFFFF |
99 | .long m_read32_romC # 0x600000 - 0x67FFFF |
100 | .long m_read32_romD # 0x680000 - 0x6FFFFF |
101 | .long m_read32_romE # 0x700000 - 0x77FFFF |
102 | .long m_read32_romF # 0x780000 - 0x7FFFFF |
103 | .long m_read32_rom10 # 0x800000 - 0x87FFFF |
104 | .long m_read32_rom11 # 0x880000 - 0x8FFFFF |
105 | .long m_read32_rom12 # 0x900000 - 0x97FFFF |
106 | .long m_read32_rom13 # 0x980000 - 0x9FFFFF |
107 | .long m_read32_misc # 0xA00000 - 0xA7FFFF |
108 | .long m_read_null # 0xA80000 - 0xAFFFFF |
109 | .long m_read_null # 0xB00000 - 0xB7FFFF |
110 | .long m_read_null # 0xB80000 - 0xBFFFFF |
111 | .long m_read32_vdp # 0xC00000 - 0xC7FFFF |
112 | .long m_read32_vdp # 0xC80000 - 0xCFFFFF |
113 | .long m_read32_vdp # 0xD00000 - 0xD7FFFF |
114 | .long m_read32_vdp # 0xD80000 - 0xDFFFFF |
115 | .long m_read32_ram # 0xE00000 - 0xE7FFFF |
116 | .long m_read32_ram # 0xE80000 - 0xEFFFFF |
117 | .long m_read32_ram # 0xF00000 - 0xF7FFFF |
118 | .long m_read32_ram # 0xF80000 - 0xFFFFFF |
119 | |
120 | |
121 | # ############################################################################# |
122 | |
123 | .bss |
124 | .align 4 |
125 | |
126 | # used tables |
127 | m_read8_table: |
128 | .skip 32*4 |
129 | |
130 | m_read16_table: |
131 | .skip 32*4 |
132 | |
133 | m_read32_table: |
134 | .skip 32*4 |
135 | |
136 | |
137 | # ############################################################################# |
138 | |
139 | .text |
140 | .align 4 |
141 | |
142 | .global PicoMemReset |
143 | .global PicoRead8 |
144 | .global PicoRead16 |
145 | .global PicoRead32 |
146 | .global PicoWriteRomHW_SSF2 |
147 | |
148 | .global m_read8_def_table |
149 | .global m_read8_table |
150 | |
151 | .macro PicoMemResetCopyDef dst_table src_table |
152 | lui $t0, %hi(\dst_table) |
153 | addiu $t0, %lo(\dst_table) |
154 | lui $t1, %hi(\src_table) |
155 | addiu $t1, %lo(\src_table) |
156 | li $t2, 32 |
157 | 1: |
158 | lw $t3, 0($t1) |
159 | sw $t3, 0($t0) |
160 | addiu $t2, -1 |
161 | addiu $t1, 4 |
162 | bnez $t2, 1b |
163 | addiu $t0, 4 |
164 | .endm |
165 | |
166 | # $t4 = 4 |
167 | .macro PicoMemResetRomArea dst_table ar_label |
168 | lui $t0, %hi(\dst_table) |
169 | addiu $t0, %lo(\dst_table) |
170 | lui $t1, %hi(\ar_label) |
171 | addiu $t1, %lo(\ar_label) |
172 | li $t2, 20 |
173 | 1: |
174 | beq $t2, $v1, 2f |
175 | addiu $t2, -1 |
176 | sll $t3, $t2, 2 |
177 | beq $t2, $t4, 1b # do not touch the SRAM area |
178 | addu $t3, $t0 |
179 | j 1b |
180 | sw $t1, 0($t3) |
181 | 2: |
182 | .endm |
183 | |
184 | |
185 | PicoMemReset: |
186 | lui $v1, %hi(Pico+0x22204) |
187 | lw $v1, %lo(Pico+0x22204)($v1) # romsize |
188 | lui $t0, 8 |
189 | addu $v1, $t0 |
190 | addiu $v1, -1 |
191 | srl $v1, 19 |
192 | |
193 | PicoMemResetCopyDef m_read8_table m_read8_def_table |
194 | PicoMemResetCopyDef m_read16_table m_read16_def_table |
195 | PicoMemResetCopyDef m_read32_table m_read32_def_table |
196 | |
197 | # update memhandlers according to ROM size |
198 | li $t4, 4 |
199 | PicoMemResetRomArea m_read8_table m_read8_above_rom |
200 | PicoMemResetRomArea m_read16_table m_read16_above_rom |
201 | PicoMemResetRomArea m_read32_table m_read32_above_rom |
202 | |
203 | jr $ra |
204 | nop |
205 | |
206 | # ############################################################################# |
207 | |
208 | .macro PicoReadJump table |
209 | lui $t0, %hi(\table) |
210 | srl $t1, $a0, 19 |
211 | ins $t0, $t1, 2, 5 |
212 | lw $t0, %lo(\table)($t0) |
213 | ins $a0, $0, 24, 8 |
214 | jr $t0 |
215 | nop |
216 | .endm |
217 | |
218 | PicoRead8: # u32 a |
219 | PicoReadJump m_read8_table |
220 | |
221 | PicoRead16: # u32 a |
222 | PicoReadJump m_read16_table |
223 | |
224 | PicoRead32: # u32 a |
225 | PicoReadJump m_read32_table |
226 | |
227 | # ############################################################################# |
228 | |
229 | m_read_null: |
230 | jr $ra |
231 | li $v0, 0 |
232 | |
233 | m_read_neg1: |
234 | jr $ra |
235 | addiu $v0, $0, 0xffff |
236 | |
237 | # loads &Pico.rom to $t3 |
238 | .macro m_read_rom_try_sram is200000 size |
239 | lui $t2, %hi(SRam) |
240 | addiu $t2, %lo(SRam) |
241 | lui $t3, %hi(Pico+0x22200) |
242 | lw $t1, 8($t2) # SRam.end |
243 | .if \is200000 |
244 | ins $a0, $0, 19, 13 |
245 | lui $t4, 0x20 |
246 | or $a0, $t4 |
247 | .endif |
248 | subu $t4, $a0, $t1 |
249 | bgtz $t4, 1f |
250 | addiu $t3, %lo(Pico+0x22200) |
251 | lw $t1, 4($t2) # SRam.start |
252 | subu $t4, $t1, $a0 |
253 | bgtz $t4, 1f |
254 | nop |
255 | lb $t1, 0x11($t3) # Pico.m.sram_reg |
256 | andi $t4, $t1, 5 |
257 | beqz $t4, 1f |
258 | nop |
259 | .if \size == 8 |
260 | j SRAMRead |
261 | nop |
262 | .elseif \size == 16 |
263 | addiu $sp, -4 |
264 | jal SRAMRead |
265 | sw $ra, 0($sp) |
266 | lw $ra, 0($sp) |
267 | addiu $sp, 4 |
268 | jr $ra |
269 | ins $v0, $v0, 8, 8 |
270 | .else |
271 | addiu $sp, -8 |
272 | sw $a0, 4($sp) |
273 | jal SRAMRead |
274 | sw $ra, 0($sp) |
275 | lw $a0, 4($sp) |
276 | sw $v0, 4($sp) |
277 | jal SRAMRead |
278 | addiu $a0, 2 |
279 | lw $v1, 4($sp) |
280 | lw $ra, 0($sp) |
281 | addiu $sp, 8 |
282 | ins $v0, $v1, 16, 16 |
283 | sll $t0, $v0, 8 |
284 | jr $ra |
285 | or $v0, $t0 |
286 | .endif |
287 | # m_read_nosram: |
288 | 1: |
289 | .endm |
290 | |
291 | .macro m_read8_rom sect |
292 | lui $t0, %hi(Pico+0x22200) |
293 | lw $t0, %lo(Pico+0x22200)($t0) # rom |
294 | xori $a0, 1 |
295 | ins $a0, $0, 19, 13 |
296 | .if \sect |
297 | lui $t1, 8*\sect |
298 | addu $a0, $t1 |
299 | .endif |
300 | addu $t0, $a0 |
301 | jr $ra |
302 | lb $v0, 0($t0) |
303 | .endm |
304 | |
305 | |
306 | m_read8_rom0: # 0x000000 - 0x07ffff |
307 | m_read8_rom 0 |
308 | |
309 | m_read8_rom1: # 0x080000 - 0x0fffff |
310 | m_read8_rom 1 |
311 | |
312 | m_read8_rom2: # 0x100000 - 0x17ffff |
313 | m_read8_rom 2 |
314 | |
315 | m_read8_rom3: # 0x180000 - 0x1fffff |
316 | m_read8_rom 3 |
317 | |
318 | m_read8_rom4: # 0x200000 - 0x27ffff, SRAM area |
319 | m_read_rom_try_sram 1 8 |
320 | lw $t1, 4($t3) # romsize |
321 | subu $t4, $t1, $a0 |
322 | blez $t4, m_read_null |
323 | lw $t1, 0($t3) # rom |
324 | xori $a0, 1 |
325 | addu $t1, $a0 |
326 | jr $ra |
327 | lb $v0, 0($t1) |
328 | |
329 | m_read8_rom5: # 0x280000 - 0x2fffff |
330 | m_read8_rom 5 |
331 | |
332 | m_read8_rom6: # 0x300000 - 0x37ffff |
333 | m_read8_rom 6 |
334 | |
335 | m_read8_rom7: # 0x380000 - 0x3fffff |
336 | m_read8_rom 7 |
337 | |
338 | m_read8_rom8: # 0x400000 - 0x47ffff |
339 | m_read8_rom 8 |
340 | |
341 | m_read8_rom9: # 0x480000 - 0x4fffff |
342 | m_read8_rom 9 |
343 | |
344 | m_read8_romA: # 0x500000 - 0x57ffff |
345 | m_read8_rom 0xA |
346 | |
347 | m_read8_romB: # 0x580000 - 0x5fffff |
348 | m_read8_rom 0xB |
349 | |
350 | m_read8_romC: # 0x600000 - 0x67ffff |
351 | m_read8_rom 0xC |
352 | |
353 | m_read8_romD: # 0x680000 - 0x6fffff |
354 | m_read8_rom 0xD |
355 | |
356 | m_read8_romE: # 0x700000 - 0x77ffff |
357 | m_read8_rom 0xE |
358 | |
359 | m_read8_romF: # 0x780000 - 0x7fffff |
360 | m_read8_rom 0xF |
361 | |
362 | m_read8_rom10: # 0x800000 - 0x87ffff |
363 | m_read8_rom 0x10 |
364 | |
365 | m_read8_rom11: # 0x880000 - 0x8fffff |
366 | m_read8_rom 0x11 |
367 | |
368 | m_read8_rom12: # 0x900000 - 0x97ffff |
369 | m_read8_rom 0x12 |
370 | |
371 | m_read8_rom13: # 0x980000 - 0x9fffff |
372 | m_read8_rom 0x13 |
373 | |
374 | |
375 | m_read8_misc: |
376 | srl $t0, $a0, 5 |
377 | sll $t0, $t0, 5 |
378 | lui $t1, 0xa1 |
379 | bne $t0, $t1, m_read8_misc2 |
380 | andi $t0, $a0, 0x1e |
381 | m_read8_misc_io: |
382 | beqz $t0, m_read8_misc_hwreg |
383 | sub $t1, $t0, 4 |
384 | bgtz $t1, m_read8_misc_ioports |
385 | nop |
386 | slti $a0, $t0, 4 |
387 | xori $a0, 1 |
388 | j PadRead |
389 | nop |
390 | |
391 | m_read8_misc_hwreg: |
392 | lui $v0, %hi(Pico+0x2220f) |
393 | jr $ra |
394 | lb $v0, %lo(Pico+0x2220f)($v0) |
395 | |
396 | m_read8_misc_ioports: |
397 | lui $v0, %hi(Pico+0x22000) |
398 | ins $v0, $t0, 0, 5 |
399 | jr $ra |
400 | lb $v0, %lo(Pico+0x22000)($v0) |
401 | |
402 | m_read8_misc2: |
403 | lui $t0, 0xa1 |
404 | ori $t0, 0x1100 |
405 | bne $a0, $t0, m_read8_misc3 |
406 | srl $t0, $a0, 16 |
407 | j z80ReadBusReq |
408 | |
409 | m_read8_misc3: |
410 | addiu $t0, 0xff60 # expecting 0xa0 to get 0 |
411 | bnez $t0, m_read8_misc4 |
412 | |
413 | # z80 area |
414 | andi $t0, $a0, 0x4000 |
415 | bnez $t0, m_read8_z80_misc |
416 | andi $t0, $a0, 0x6000 |
417 | j z80Read8 # z80 RAM |
418 | |
419 | m_read8_z80_misc: |
420 | addiu $t0, 0xc000 # expecting 0x4000 to get 0 |
421 | bnez $t0, m_read_neg1 # invalid |
422 | |
423 | lui $t0, %hi(PicoOpt) |
424 | lw $t0, %lo(PicoOpt)($t0) |
425 | andi $t0, 1 |
426 | beqz $t0, m_read8_fake_ym2612 |
427 | lui $t0, %hi(Pico+0x22208) |
b542be46 |
428 | lui $t0, %hi(ym2612_st) |
429 | lw $t0, %lo(ym2612_st)($t0) |
430 | jr $ra |
431 | lb $v0, 0x11($t0) |
3ec29f01 |
432 | |
433 | m_read8_fake_ym2612: |
434 | lb $v0, %lo(Pico+0x22208)($t0) # Pico.m.rotate |
435 | addiu $t1, $v0, 1 |
436 | jr $ra |
437 | sb $t1, %lo(Pico+0x22208)($t0) |
438 | |
439 | # delay slot friendly |
440 | .macro m_read8_call16 funcname |
441 | andi $t0, $a0, 1 |
442 | beqz $t0, 1f |
443 | li $a1, 8 # not always needed, but shouln't cause problems |
444 | j \funcname # odd address |
445 | nop |
446 | 1: |
447 | addiu $sp, -4 |
448 | sw $ra, 0($sp) |
449 | jal \funcname |
450 | xori $a0, 1 |
451 | lw $ra, 0($sp) |
452 | addiu $sp, 4 |
453 | jr $ra |
454 | srl $v0, 8 |
455 | .endm |
456 | |
457 | m_read8_misc4: |
458 | # if everything else fails, use generic handler |
459 | m_read8_call16 OtherRead16 |
460 | |
461 | m_read8_vdp: |
462 | ext $t0, $a0, 16, 3 |
463 | andi $t1, $a0, 0xe0 |
464 | or $t0, $t1 |
465 | bnez $t0, m_read_null # invalid address |
466 | m_read8_call16 PicoVideoRead |
467 | |
468 | m_read8_ram: |
469 | lui $t0, %hi(Pico) |
470 | ins $t0, $a0, 0, 16 |
471 | xori $t0, 1 |
472 | jr $ra |
473 | lb $v0, %lo(Pico)($t0) |
474 | |
475 | m_read8_above_rom: |
476 | # might still be SRam (Micro Machines, HardBall '95) |
477 | m_read_rom_try_sram 0 8 |
478 | m_read8_call16 OtherRead16End |
479 | |
480 | # ############################################################################# |
481 | |
482 | .macro m_read16_rom sect |
483 | lui $t0, %hi(Pico+0x22200) |
484 | lw $t0, %lo(Pico+0x22200)($t0) # rom |
485 | ins $a0, $0, 0, 1 |
486 | ins $a0, $0, 19, 13 |
487 | .if \sect |
488 | lui $t1, 8*\sect |
489 | addu $a0, $t1 |
490 | .endif |
491 | addu $t0, $a0 |
492 | jr $ra |
493 | lh $v0, 0($t0) |
494 | .endm |
495 | |
496 | |
497 | m_read16_rom0: # 0x000000 - 0x07ffff |
498 | m_read16_rom 0 |
499 | |
500 | m_read16_rom1: # 0x080000 - 0x0fffff |
501 | m_read16_rom 1 |
502 | |
503 | m_read16_rom2: # 0x100000 - 0x17ffff |
504 | m_read16_rom 2 |
505 | |
506 | m_read16_rom3: # 0x180000 - 0x1fffff |
507 | m_read16_rom 3 |
508 | |
509 | m_read16_rom4: # 0x200000 - 0x27ffff, SRAM area |
510 | m_read_rom_try_sram 1 16 |
511 | lw $t1, 4($t3) # romsize |
512 | subu $t4, $t1, $a0 |
513 | blez $t4, m_read_null |
514 | lw $t1, 0($t3) # rom |
515 | ins $a0, $0, 0, 1 |
516 | addu $t1, $a0 |
517 | jr $ra |
518 | lh $v0, 0($t1) |
519 | |
520 | m_read16_rom5: # 0x280000 - 0x2fffff |
521 | m_read16_rom 5 |
522 | |
523 | m_read16_rom6: # 0x300000 - 0x37ffff |
524 | m_read16_rom 6 |
525 | |
526 | m_read16_rom7: # 0x380000 - 0x3fffff |
527 | m_read16_rom 7 |
528 | |
529 | m_read16_rom8: # 0x400000 - 0x47ffff |
530 | m_read16_rom 8 |
531 | |
532 | m_read16_rom9: # 0x480000 - 0x4fffff |
533 | m_read16_rom 9 |
534 | |
535 | m_read16_romA: # 0x500000 - 0x57ffff |
536 | m_read16_rom 0xA |
537 | |
538 | m_read16_romB: # 0x580000 - 0x5fffff |
539 | m_read16_rom 0xB |
540 | |
541 | m_read16_romC: # 0x600000 - 0x67ffff |
542 | m_read16_rom 0xC |
543 | |
544 | m_read16_romD: # 0x680000 - 0x6fffff |
545 | m_read16_rom 0xD |
546 | |
547 | m_read16_romE: # 0x700000 - 0x77ffff |
548 | m_read16_rom 0xE |
549 | |
550 | m_read16_romF: # 0x780000 - 0x7fffff |
551 | m_read16_rom 0xF |
552 | |
553 | m_read16_rom10: # 0x800000 - 0x87ffff |
554 | m_read16_rom 0x10 |
555 | |
556 | m_read16_rom11: # 0x880000 - 0x8fffff |
557 | m_read16_rom 0x11 |
558 | |
559 | m_read16_rom12: # 0x900000 - 0x97ffff |
560 | m_read16_rom 0x12 |
561 | |
562 | m_read16_rom13: # 0x980000 - 0x9fffff |
563 | m_read16_rom 0x13 |
564 | |
565 | m_read16_misc: |
566 | ins $a0, $0, 0, 1 |
567 | j OtherRead16 |
568 | li $a1, 16 |
569 | |
570 | m_read16_vdp: |
571 | ext $t0, $a0, 16, 3 |
572 | andi $t1, $a0, 0xe0 |
573 | or $t0, $t1 |
574 | bnez $t0, m_read_null # invalid address |
575 | ins $a0, $0, 0, 1 |
576 | j PicoVideoRead |
577 | nop |
578 | |
579 | m_read16_ram: |
580 | lui $t0, %hi(Pico) |
581 | ins $a0, $0, 0, 1 |
582 | ins $t0, $a0, 0, 16 |
583 | jr $ra |
584 | lh $v0, %lo(Pico)($t0) |
585 | |
586 | m_read16_above_rom: |
587 | # might still be SRam |
588 | m_read_rom_try_sram 0 16 |
589 | j OtherRead16End |
590 | ins $a0, $0, 0, 1 |
591 | |
592 | # ############################################################################# |
593 | |
594 | .macro m_read32_rom sect |
595 | lui $t0, %hi(Pico+0x22200) |
596 | lw $t0, %lo(Pico+0x22200)($t0) # rom |
597 | ins $a0, $0, 0, 1 |
598 | ins $a0, $0, 19, 13 |
599 | .if \sect |
600 | lui $t1, 8*\sect |
601 | addu $a0, $t1 |
602 | .endif |
603 | addu $t0, $a0 |
604 | lh $v1, 0($t0) |
605 | lh $v0, 2($t0) |
606 | jr $ra |
607 | ins $v0, $v1, 16, 16 |
608 | .endm |
609 | |
610 | |
611 | m_read32_rom0: # 0x000000 - 0x07ffff |
612 | m_read32_rom 0 |
613 | |
614 | m_read32_rom1: # 0x080000 - 0x0fffff |
615 | m_read32_rom 1 |
616 | |
617 | m_read32_rom2: # 0x100000 - 0x17ffff |
618 | m_read32_rom 2 |
619 | |
620 | m_read32_rom3: # 0x180000 - 0x1fffff |
621 | m_read32_rom 3 |
622 | |
623 | m_read32_rom4: # 0x200000 - 0x27ffff, SRAM area |
624 | m_read_rom_try_sram 1 32 |
625 | lw $t1, 4($t3) # romsize |
626 | subu $t4, $t1, $a0 |
627 | blez $t4, m_read_null |
628 | lw $t1, 0($t3) # rom |
629 | ins $a0, $0, 0, 1 |
630 | addu $t1, $a0 |
631 | lh $v1, 0($t1) |
632 | lh $v0, 2($t1) |
633 | jr $ra |
634 | ins $v0, $v1, 16, 16 |
635 | |
636 | m_read32_rom5: # 0x280000 - 0x2fffff |
637 | m_read32_rom 5 |
638 | |
639 | m_read32_rom6: # 0x300000 - 0x37ffff |
640 | m_read32_rom 6 |
641 | |
642 | m_read32_rom7: # 0x380000 - 0x3fffff |
643 | m_read32_rom 7 |
644 | |
645 | m_read32_rom8: # 0x400000 - 0x47ffff |
646 | m_read32_rom 8 |
647 | |
648 | m_read32_rom9: # 0x480000 - 0x4fffff |
649 | m_read32_rom 9 |
650 | |
651 | m_read32_romA: # 0x500000 - 0x57ffff |
652 | m_read32_rom 0xA |
653 | |
654 | m_read32_romB: # 0x580000 - 0x5fffff |
655 | m_read32_rom 0xB |
656 | |
657 | m_read32_romC: # 0x600000 - 0x67ffff |
658 | m_read32_rom 0xC |
659 | |
660 | m_read32_romD: # 0x680000 - 0x6fffff |
661 | m_read32_rom 0xD |
662 | |
663 | m_read32_romE: # 0x700000 - 0x77ffff |
664 | m_read32_rom 0xE |
665 | |
666 | m_read32_romF: # 0x780000 - 0x7fffff |
667 | m_read32_rom 0xF |
668 | |
669 | m_read32_rom10: # 0x800000 - 0x87ffff |
670 | m_read32_rom 0x10 |
671 | |
672 | m_read32_rom11: # 0x880000 - 0x8fffff |
673 | m_read32_rom 0x11 |
674 | |
675 | m_read32_rom12: # 0x900000 - 0x97ffff |
676 | m_read32_rom 0x12 |
677 | |
678 | m_read32_rom13: # 0x980000 - 0x9fffff |
679 | m_read32_rom 0x13 |
680 | |
681 | .macro m_read32_call16 func need_a1=0 |
682 | addiu $sp, -8 |
683 | sw $ra, 0($sp) |
684 | sw $s0, 4($sp) |
685 | .if \need_a1 |
686 | li $a1, 16 |
687 | .endif |
688 | jal \func |
689 | move $s0, $a0 |
690 | |
691 | addu $a0, $s0, 2 |
692 | .if \need_a1 |
693 | li $a1, 16 |
694 | .endif |
695 | jal \func |
696 | move $s0, $v0 |
697 | |
698 | ins $v0, $s0, 16, 16 |
699 | lw $ra, 0($sp) |
700 | lw $s0, 4($sp) |
701 | jr $ra |
702 | addiu $sp, 8 |
703 | .endm |
704 | |
705 | m_read32_misc: |
706 | ins $a0, $0, 0, 1 |
707 | m_read32_call16 OtherRead16, 1 |
708 | |
709 | m_read32_vdp: |
710 | ext $t0, $a0, 16, 3 |
711 | andi $t1, $a0, 0xe0 |
712 | or $t0, $t1 |
713 | bnez $t0, m_read_null # invalid address |
714 | ins $a0, $0, 0, 1 |
715 | m_read32_call16 PicoVideoRead |
716 | |
717 | m_read32_ram: |
718 | lui $t0, %hi(Pico) |
719 | ins $a0, $0, 0, 1 |
720 | ins $t0, $a0, 0, 16 |
721 | lh $v1, %lo(Pico)($t0) |
722 | lh $v0, %lo(Pico+2)($t0) |
723 | jr $ra |
724 | ins $v0, $v1, 16, 16 |
725 | |
726 | m_read32_above_rom: |
727 | # might still be SRam |
728 | m_read_rom_try_sram 0 32 |
729 | ins $a0, $0, 0, 1 |
730 | m_read32_call16 OtherRead16End |
731 | |
732 | # ############################################################################# |
733 | |
734 | .macro PicoWriteRomHW_SSF2_ls def_table table |
735 | lui $t3, %hi(\def_table) |
736 | ins $t3, $a1, 2, 5 |
737 | lw $t0, %lo(\def_table)($t3) |
738 | lui $t2, %hi(\table) |
739 | ins $t2, $a0, 2, 3 |
740 | sw $t0, %lo(\table)($t2) |
741 | .endm |
742 | |
743 | PicoWriteRomHW_SSF2: # u32 a, u32 d |
744 | ext $a0, $a0, 1, 3 |
745 | bnez $a0, pwr_banking |
746 | |
747 | # sram register |
748 | lui $t0, %hi(Pico+0x22211) |
749 | lb $t1, %lo(Pico+0x22211)($t0) # Pico.m.sram_reg |
750 | ins $t1, $a1, 0, 2 |
751 | jr $ra |
752 | sb $t1, %lo(Pico+0x22211)($t0) |
753 | |
754 | pwr_banking: |
755 | andi $a1, 0x1f |
756 | |
757 | PicoWriteRomHW_SSF2_ls m_read8_def_table m_read8_table |
758 | PicoWriteRomHW_SSF2_ls m_read16_def_table m_read16_table |
759 | PicoWriteRomHW_SSF2_ls m_read32_def_table m_read32_table |
760 | |
761 | jr $ra |
762 | nop |
763 | |