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 |
9dc09829 |
263 | sw $ra, -4($sp) |
264 | jal SRAMRead16 |
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265 | addiu $sp, -4 |
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266 | lw $ra, 0($sp) |
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267 | jr $ra |
9dc09829 |
268 | addiu $sp, 4 |
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269 | .else |
270 | addiu $sp, -8 |
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271 | sw $ra, 0($sp) |
9dc09829 |
272 | sw $a0, 4($sp) |
273 | jal SRAMRead16 |
274 | nop |
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275 | lw $a0, 4($sp) |
276 | sw $v0, 4($sp) |
9dc09829 |
277 | jal SRAMRead16 |
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278 | addiu $a0, 2 |
279 | lw $v1, 4($sp) |
280 | lw $ra, 0($sp) |
281 | addiu $sp, 8 |
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282 | jr $ra |
9dc09829 |
283 | ins $v0, $v1, 16, 16 |
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284 | .endif |
285 | # m_read_nosram: |
286 | 1: |
287 | .endm |
288 | |
289 | .macro m_read8_rom sect |
290 | lui $t0, %hi(Pico+0x22200) |
291 | lw $t0, %lo(Pico+0x22200)($t0) # rom |
292 | xori $a0, 1 |
293 | ins $a0, $0, 19, 13 |
294 | .if \sect |
295 | lui $t1, 8*\sect |
296 | addu $a0, $t1 |
297 | .endif |
298 | addu $t0, $a0 |
299 | jr $ra |
300 | lb $v0, 0($t0) |
301 | .endm |
302 | |
303 | |
304 | m_read8_rom0: # 0x000000 - 0x07ffff |
305 | m_read8_rom 0 |
306 | |
307 | m_read8_rom1: # 0x080000 - 0x0fffff |
308 | m_read8_rom 1 |
309 | |
310 | m_read8_rom2: # 0x100000 - 0x17ffff |
311 | m_read8_rom 2 |
312 | |
313 | m_read8_rom3: # 0x180000 - 0x1fffff |
314 | m_read8_rom 3 |
315 | |
316 | m_read8_rom4: # 0x200000 - 0x27ffff, SRAM area |
317 | m_read_rom_try_sram 1 8 |
318 | lw $t1, 4($t3) # romsize |
319 | subu $t4, $t1, $a0 |
320 | blez $t4, m_read_null |
321 | lw $t1, 0($t3) # rom |
322 | xori $a0, 1 |
323 | addu $t1, $a0 |
324 | jr $ra |
325 | lb $v0, 0($t1) |
326 | |
327 | m_read8_rom5: # 0x280000 - 0x2fffff |
328 | m_read8_rom 5 |
329 | |
330 | m_read8_rom6: # 0x300000 - 0x37ffff |
331 | m_read8_rom 6 |
332 | |
333 | m_read8_rom7: # 0x380000 - 0x3fffff |
334 | m_read8_rom 7 |
335 | |
336 | m_read8_rom8: # 0x400000 - 0x47ffff |
337 | m_read8_rom 8 |
338 | |
339 | m_read8_rom9: # 0x480000 - 0x4fffff |
340 | m_read8_rom 9 |
341 | |
342 | m_read8_romA: # 0x500000 - 0x57ffff |
343 | m_read8_rom 0xA |
344 | |
345 | m_read8_romB: # 0x580000 - 0x5fffff |
346 | m_read8_rom 0xB |
347 | |
348 | m_read8_romC: # 0x600000 - 0x67ffff |
349 | m_read8_rom 0xC |
350 | |
351 | m_read8_romD: # 0x680000 - 0x6fffff |
352 | m_read8_rom 0xD |
353 | |
354 | m_read8_romE: # 0x700000 - 0x77ffff |
355 | m_read8_rom 0xE |
356 | |
357 | m_read8_romF: # 0x780000 - 0x7fffff |
358 | m_read8_rom 0xF |
359 | |
360 | m_read8_rom10: # 0x800000 - 0x87ffff |
361 | m_read8_rom 0x10 |
362 | |
363 | m_read8_rom11: # 0x880000 - 0x8fffff |
364 | m_read8_rom 0x11 |
365 | |
366 | m_read8_rom12: # 0x900000 - 0x97ffff |
367 | m_read8_rom 0x12 |
368 | |
369 | m_read8_rom13: # 0x980000 - 0x9fffff |
370 | m_read8_rom 0x13 |
371 | |
372 | |
373 | m_read8_misc: |
374 | srl $t0, $a0, 5 |
375 | sll $t0, $t0, 5 |
376 | lui $t1, 0xa1 |
377 | bne $t0, $t1, m_read8_misc2 |
378 | andi $t0, $a0, 0x1e |
379 | m_read8_misc_io: |
380 | beqz $t0, m_read8_misc_hwreg |
381 | sub $t1, $t0, 4 |
382 | bgtz $t1, m_read8_misc_ioports |
383 | nop |
384 | slti $a0, $t0, 4 |
385 | xori $a0, 1 |
386 | j PadRead |
387 | nop |
388 | |
389 | m_read8_misc_hwreg: |
390 | lui $v0, %hi(Pico+0x2220f) |
391 | jr $ra |
392 | lb $v0, %lo(Pico+0x2220f)($v0) |
393 | |
394 | m_read8_misc_ioports: |
395 | lui $v0, %hi(Pico+0x22000) |
396 | ins $v0, $t0, 0, 5 |
397 | jr $ra |
398 | lb $v0, %lo(Pico+0x22000)($v0) |
399 | |
400 | m_read8_misc2: |
401 | lui $t0, 0xa1 |
402 | ori $t0, 0x1100 |
403 | bne $a0, $t0, m_read8_misc3 |
404 | srl $t0, $a0, 16 |
405 | j z80ReadBusReq |
406 | |
407 | m_read8_misc3: |
408 | addiu $t0, 0xff60 # expecting 0xa0 to get 0 |
409 | bnez $t0, m_read8_misc4 |
410 | |
411 | # z80 area |
412 | andi $t0, $a0, 0x4000 |
413 | bnez $t0, m_read8_z80_misc |
414 | andi $t0, $a0, 0x6000 |
415 | j z80Read8 # z80 RAM |
416 | |
417 | m_read8_z80_misc: |
418 | addiu $t0, 0xc000 # expecting 0x4000 to get 0 |
419 | bnez $t0, m_read_neg1 # invalid |
420 | |
421 | lui $t0, %hi(PicoOpt) |
422 | lw $t0, %lo(PicoOpt)($t0) |
423 | andi $t0, 1 |
424 | beqz $t0, m_read8_fake_ym2612 |
425 | lui $t0, %hi(Pico+0x22208) |
b542be46 |
426 | lui $t0, %hi(ym2612_st) |
427 | lw $t0, %lo(ym2612_st)($t0) |
428 | jr $ra |
429 | lb $v0, 0x11($t0) |
3ec29f01 |
430 | |
431 | m_read8_fake_ym2612: |
432 | lb $v0, %lo(Pico+0x22208)($t0) # Pico.m.rotate |
433 | addiu $t1, $v0, 1 |
434 | jr $ra |
435 | sb $t1, %lo(Pico+0x22208)($t0) |
436 | |
437 | # delay slot friendly |
438 | .macro m_read8_call16 funcname |
439 | andi $t0, $a0, 1 |
440 | beqz $t0, 1f |
441 | li $a1, 8 # not always needed, but shouln't cause problems |
442 | j \funcname # odd address |
443 | nop |
444 | 1: |
445 | addiu $sp, -4 |
446 | sw $ra, 0($sp) |
447 | jal \funcname |
448 | xori $a0, 1 |
449 | lw $ra, 0($sp) |
450 | addiu $sp, 4 |
451 | jr $ra |
452 | srl $v0, 8 |
453 | .endm |
454 | |
455 | m_read8_misc4: |
456 | # if everything else fails, use generic handler |
457 | m_read8_call16 OtherRead16 |
458 | |
459 | m_read8_vdp: |
460 | ext $t0, $a0, 16, 3 |
461 | andi $t1, $a0, 0xe0 |
462 | or $t0, $t1 |
463 | bnez $t0, m_read_null # invalid address |
464 | m_read8_call16 PicoVideoRead |
465 | |
466 | m_read8_ram: |
467 | lui $t0, %hi(Pico) |
468 | ins $t0, $a0, 0, 16 |
469 | xori $t0, 1 |
470 | jr $ra |
471 | lb $v0, %lo(Pico)($t0) |
472 | |
473 | m_read8_above_rom: |
474 | # might still be SRam (Micro Machines, HardBall '95) |
475 | m_read_rom_try_sram 0 8 |
476 | m_read8_call16 OtherRead16End |
477 | |
478 | # ############################################################################# |
479 | |
480 | .macro m_read16_rom sect |
481 | lui $t0, %hi(Pico+0x22200) |
482 | lw $t0, %lo(Pico+0x22200)($t0) # rom |
483 | ins $a0, $0, 0, 1 |
484 | ins $a0, $0, 19, 13 |
485 | .if \sect |
486 | lui $t1, 8*\sect |
487 | addu $a0, $t1 |
488 | .endif |
489 | addu $t0, $a0 |
490 | jr $ra |
491 | lh $v0, 0($t0) |
492 | .endm |
493 | |
494 | |
495 | m_read16_rom0: # 0x000000 - 0x07ffff |
496 | m_read16_rom 0 |
497 | |
498 | m_read16_rom1: # 0x080000 - 0x0fffff |
499 | m_read16_rom 1 |
500 | |
501 | m_read16_rom2: # 0x100000 - 0x17ffff |
502 | m_read16_rom 2 |
503 | |
504 | m_read16_rom3: # 0x180000 - 0x1fffff |
505 | m_read16_rom 3 |
506 | |
507 | m_read16_rom4: # 0x200000 - 0x27ffff, SRAM area |
508 | m_read_rom_try_sram 1 16 |
509 | lw $t1, 4($t3) # romsize |
510 | subu $t4, $t1, $a0 |
511 | blez $t4, m_read_null |
512 | lw $t1, 0($t3) # rom |
513 | ins $a0, $0, 0, 1 |
514 | addu $t1, $a0 |
515 | jr $ra |
516 | lh $v0, 0($t1) |
517 | |
518 | m_read16_rom5: # 0x280000 - 0x2fffff |
519 | m_read16_rom 5 |
520 | |
521 | m_read16_rom6: # 0x300000 - 0x37ffff |
522 | m_read16_rom 6 |
523 | |
524 | m_read16_rom7: # 0x380000 - 0x3fffff |
525 | m_read16_rom 7 |
526 | |
527 | m_read16_rom8: # 0x400000 - 0x47ffff |
528 | m_read16_rom 8 |
529 | |
530 | m_read16_rom9: # 0x480000 - 0x4fffff |
531 | m_read16_rom 9 |
532 | |
533 | m_read16_romA: # 0x500000 - 0x57ffff |
534 | m_read16_rom 0xA |
535 | |
536 | m_read16_romB: # 0x580000 - 0x5fffff |
537 | m_read16_rom 0xB |
538 | |
539 | m_read16_romC: # 0x600000 - 0x67ffff |
540 | m_read16_rom 0xC |
541 | |
542 | m_read16_romD: # 0x680000 - 0x6fffff |
543 | m_read16_rom 0xD |
544 | |
545 | m_read16_romE: # 0x700000 - 0x77ffff |
546 | m_read16_rom 0xE |
547 | |
548 | m_read16_romF: # 0x780000 - 0x7fffff |
549 | m_read16_rom 0xF |
550 | |
551 | m_read16_rom10: # 0x800000 - 0x87ffff |
552 | m_read16_rom 0x10 |
553 | |
554 | m_read16_rom11: # 0x880000 - 0x8fffff |
555 | m_read16_rom 0x11 |
556 | |
557 | m_read16_rom12: # 0x900000 - 0x97ffff |
558 | m_read16_rom 0x12 |
559 | |
560 | m_read16_rom13: # 0x980000 - 0x9fffff |
561 | m_read16_rom 0x13 |
562 | |
563 | m_read16_misc: |
564 | ins $a0, $0, 0, 1 |
565 | j OtherRead16 |
566 | li $a1, 16 |
567 | |
568 | m_read16_vdp: |
569 | ext $t0, $a0, 16, 3 |
570 | andi $t1, $a0, 0xe0 |
571 | or $t0, $t1 |
572 | bnez $t0, m_read_null # invalid address |
573 | ins $a0, $0, 0, 1 |
574 | j PicoVideoRead |
575 | nop |
576 | |
577 | m_read16_ram: |
578 | lui $t0, %hi(Pico) |
579 | ins $a0, $0, 0, 1 |
580 | ins $t0, $a0, 0, 16 |
581 | jr $ra |
582 | lh $v0, %lo(Pico)($t0) |
583 | |
584 | m_read16_above_rom: |
585 | # might still be SRam |
586 | m_read_rom_try_sram 0 16 |
587 | j OtherRead16End |
588 | ins $a0, $0, 0, 1 |
589 | |
590 | # ############################################################################# |
591 | |
592 | .macro m_read32_rom sect |
593 | lui $t0, %hi(Pico+0x22200) |
594 | lw $t0, %lo(Pico+0x22200)($t0) # rom |
595 | ins $a0, $0, 0, 1 |
596 | ins $a0, $0, 19, 13 |
597 | .if \sect |
598 | lui $t1, 8*\sect |
599 | addu $a0, $t1 |
600 | .endif |
601 | addu $t0, $a0 |
602 | lh $v1, 0($t0) |
603 | lh $v0, 2($t0) |
604 | jr $ra |
605 | ins $v0, $v1, 16, 16 |
606 | .endm |
607 | |
608 | |
609 | m_read32_rom0: # 0x000000 - 0x07ffff |
610 | m_read32_rom 0 |
611 | |
612 | m_read32_rom1: # 0x080000 - 0x0fffff |
613 | m_read32_rom 1 |
614 | |
615 | m_read32_rom2: # 0x100000 - 0x17ffff |
616 | m_read32_rom 2 |
617 | |
618 | m_read32_rom3: # 0x180000 - 0x1fffff |
619 | m_read32_rom 3 |
620 | |
621 | m_read32_rom4: # 0x200000 - 0x27ffff, SRAM area |
622 | m_read_rom_try_sram 1 32 |
623 | lw $t1, 4($t3) # romsize |
624 | subu $t4, $t1, $a0 |
625 | blez $t4, m_read_null |
626 | lw $t1, 0($t3) # rom |
627 | ins $a0, $0, 0, 1 |
628 | addu $t1, $a0 |
629 | lh $v1, 0($t1) |
630 | lh $v0, 2($t1) |
631 | jr $ra |
632 | ins $v0, $v1, 16, 16 |
633 | |
634 | m_read32_rom5: # 0x280000 - 0x2fffff |
635 | m_read32_rom 5 |
636 | |
637 | m_read32_rom6: # 0x300000 - 0x37ffff |
638 | m_read32_rom 6 |
639 | |
640 | m_read32_rom7: # 0x380000 - 0x3fffff |
641 | m_read32_rom 7 |
642 | |
643 | m_read32_rom8: # 0x400000 - 0x47ffff |
644 | m_read32_rom 8 |
645 | |
646 | m_read32_rom9: # 0x480000 - 0x4fffff |
647 | m_read32_rom 9 |
648 | |
649 | m_read32_romA: # 0x500000 - 0x57ffff |
650 | m_read32_rom 0xA |
651 | |
652 | m_read32_romB: # 0x580000 - 0x5fffff |
653 | m_read32_rom 0xB |
654 | |
655 | m_read32_romC: # 0x600000 - 0x67ffff |
656 | m_read32_rom 0xC |
657 | |
658 | m_read32_romD: # 0x680000 - 0x6fffff |
659 | m_read32_rom 0xD |
660 | |
661 | m_read32_romE: # 0x700000 - 0x77ffff |
662 | m_read32_rom 0xE |
663 | |
664 | m_read32_romF: # 0x780000 - 0x7fffff |
665 | m_read32_rom 0xF |
666 | |
667 | m_read32_rom10: # 0x800000 - 0x87ffff |
668 | m_read32_rom 0x10 |
669 | |
670 | m_read32_rom11: # 0x880000 - 0x8fffff |
671 | m_read32_rom 0x11 |
672 | |
673 | m_read32_rom12: # 0x900000 - 0x97ffff |
674 | m_read32_rom 0x12 |
675 | |
676 | m_read32_rom13: # 0x980000 - 0x9fffff |
677 | m_read32_rom 0x13 |
678 | |
679 | .macro m_read32_call16 func need_a1=0 |
680 | addiu $sp, -8 |
681 | sw $ra, 0($sp) |
682 | sw $s0, 4($sp) |
683 | .if \need_a1 |
684 | li $a1, 16 |
685 | .endif |
686 | jal \func |
687 | move $s0, $a0 |
688 | |
689 | addu $a0, $s0, 2 |
690 | .if \need_a1 |
691 | li $a1, 16 |
692 | .endif |
693 | jal \func |
694 | move $s0, $v0 |
695 | |
696 | ins $v0, $s0, 16, 16 |
697 | lw $ra, 0($sp) |
698 | lw $s0, 4($sp) |
699 | jr $ra |
700 | addiu $sp, 8 |
701 | .endm |
702 | |
703 | m_read32_misc: |
704 | ins $a0, $0, 0, 1 |
705 | m_read32_call16 OtherRead16, 1 |
706 | |
707 | m_read32_vdp: |
708 | ext $t0, $a0, 16, 3 |
709 | andi $t1, $a0, 0xe0 |
710 | or $t0, $t1 |
711 | bnez $t0, m_read_null # invalid address |
712 | ins $a0, $0, 0, 1 |
713 | m_read32_call16 PicoVideoRead |
714 | |
715 | m_read32_ram: |
716 | lui $t0, %hi(Pico) |
717 | ins $a0, $0, 0, 1 |
718 | ins $t0, $a0, 0, 16 |
719 | lh $v1, %lo(Pico)($t0) |
720 | lh $v0, %lo(Pico+2)($t0) |
721 | jr $ra |
722 | ins $v0, $v1, 16, 16 |
723 | |
724 | m_read32_above_rom: |
725 | # might still be SRam |
726 | m_read_rom_try_sram 0 32 |
727 | ins $a0, $0, 0, 1 |
728 | m_read32_call16 OtherRead16End |
729 | |
730 | # ############################################################################# |
731 | |
732 | .macro PicoWriteRomHW_SSF2_ls def_table table |
733 | lui $t3, %hi(\def_table) |
734 | ins $t3, $a1, 2, 5 |
735 | lw $t0, %lo(\def_table)($t3) |
736 | lui $t2, %hi(\table) |
737 | ins $t2, $a0, 2, 3 |
738 | sw $t0, %lo(\table)($t2) |
739 | .endm |
740 | |
741 | PicoWriteRomHW_SSF2: # u32 a, u32 d |
742 | ext $a0, $a0, 1, 3 |
743 | bnez $a0, pwr_banking |
744 | |
745 | # sram register |
746 | lui $t0, %hi(Pico+0x22211) |
747 | lb $t1, %lo(Pico+0x22211)($t0) # Pico.m.sram_reg |
748 | ins $t1, $a1, 0, 2 |
749 | jr $ra |
750 | sb $t1, %lo(Pico+0x22211)($t0) |
751 | |
752 | pwr_banking: |
753 | andi $a1, 0x1f |
754 | |
755 | PicoWriteRomHW_SSF2_ls m_read8_def_table m_read8_table |
756 | PicoWriteRomHW_SSF2_ls m_read16_def_table m_read16_table |
757 | PicoWriteRomHW_SSF2_ls m_read32_def_table m_read32_table |
758 | |
759 | jr $ra |
760 | nop |
761 | |