be2c4208 |
1 | #include "../pico_int.h" |
2 | #include "../memory.h" |
3 | |
4 | static const char str_mars[] = "MARS"; |
5 | |
974fdb5b |
6 | struct Pico32xMem *Pico32xMem; |
7 | |
5e49c3a8 |
8 | static void bank_switch(int b); |
9 | |
acd35d4c |
10 | #define MSB8(x) ((x) >> 8) |
11 | |
266c6afa |
12 | // poll detection |
13 | struct poll_det { |
14 | int addr, pc, cnt; |
15 | }; |
16 | static struct poll_det m68k_poll; |
17 | static struct poll_det msh2_poll; |
18 | |
19 | #define POLL_THRESHOLD 6 |
20 | |
21 | static int poll_detect(struct poll_det *pd, u32 a, u32 pc, int flag) |
22 | { |
23 | int ret = 0; |
24 | |
25 | if (a - 2 <= pd->addr && pd->addr <= a + 2 && pd->pc == pc) { |
26 | pd->cnt++; |
27 | if (pd->cnt > POLL_THRESHOLD) { |
28 | if (!(Pico32x.emu_flags & flag)) { |
29 | elprintf(EL_32X, "%s poll addr %08x @ %06x", |
30 | flag == P32XF_68KPOLL ? "m68k" : (flag == P32XF_MSH2POLL ? "msh2" : "ssh2"), a, pc); |
31 | ret = 1; |
32 | } |
33 | Pico32x.emu_flags |= flag; |
34 | } |
35 | } |
36 | else |
37 | pd->cnt = 0; |
38 | pd->addr = a; |
39 | pd->pc = pc; |
40 | |
41 | return ret; |
42 | } |
43 | |
44 | static int poll_undetect(struct poll_det *pd, int flag) |
45 | { |
46 | int ret = 0; |
47 | if (pd->cnt > POLL_THRESHOLD) |
48 | ret = 1; |
49 | pd->addr = pd->cnt = 0; |
50 | Pico32x.emu_flags &= ~flag; |
51 | return ret; |
52 | } |
53 | |
974fdb5b |
54 | // SH2 faking |
266c6afa |
55 | //#define FAKE_SH2 |
acd35d4c |
56 | int p32x_csum_faked; |
57 | #ifdef FAKE_SH2 |
974fdb5b |
58 | static const u16 comm_fakevals[] = { |
59 | 0x4d5f, 0x4f4b, // M_OK |
60 | 0x535f, 0x4f4b, // S_OK |
5e49c3a8 |
61 | 0x4D41, 0x5346, // MASF - Brutal Unleashed |
62 | 0x5331, 0x4d31, // Darxide |
63 | 0x5332, 0x4d32, |
64 | 0x5333, 0x4d33, |
65 | 0x0000, 0x0000, // eq for doom |
974fdb5b |
66 | 0x0002, // Mortal Kombat |
acd35d4c |
67 | // 0, // pad |
be2c4208 |
68 | }; |
acd35d4c |
69 | |
70 | static u32 sh2_comm_faker(u32 a) |
71 | { |
72 | static int f = 0; |
73 | if (a == 0x28 && !p32x_csum_faked) { |
74 | p32x_csum_faked = 1; |
75 | return *(unsigned short *)(Pico.rom + 0x18e); |
76 | } |
77 | if (f >= sizeof(comm_fakevals) / sizeof(comm_fakevals[0])) |
78 | f = 0; |
79 | return comm_fakevals[f++]; |
80 | } |
81 | #endif |
be2c4208 |
82 | |
be2c4208 |
83 | static u32 p32x_reg_read16(u32 a) |
84 | { |
85 | a &= 0x3e; |
86 | |
acd35d4c |
87 | #ifdef FAKE_SH2 |
974fdb5b |
88 | if ((a & 0x30) == 0x20) |
acd35d4c |
89 | return sh2_comm_faker(a); |
266c6afa |
90 | #else |
91 | if (poll_detect(&m68k_poll, a, SekPc, P32XF_68KPOLL)) { |
92 | SekSetStop(1); |
93 | SekEndRun(16); |
94 | } |
acd35d4c |
95 | #endif |
974fdb5b |
96 | |
be2c4208 |
97 | return Pico32x.regs[a / 2]; |
98 | } |
99 | |
be2c4208 |
100 | static void p32x_reg_write8(u32 a, u32 d) |
101 | { |
acd35d4c |
102 | u16 *r = Pico32x.regs; |
be2c4208 |
103 | a &= 0x3f; |
104 | |
acd35d4c |
105 | if (a == 1 && !(r[0] & 1)) { |
106 | r[0] |= 1; |
be2c4208 |
107 | Pico32xStartup(); |
108 | return; |
109 | } |
5e49c3a8 |
110 | |
acd35d4c |
111 | if (!(r[0] & 1)) |
5e49c3a8 |
112 | return; |
113 | |
acd35d4c |
114 | switch (a) { |
115 | case 0: |
116 | r[0] = (r[0] & 0x83) | ((d << 8) & P32XS_FM); |
117 | break; |
118 | case 5: |
119 | d &= 7; |
120 | if (r[4/2] != d) { |
121 | r[4/2] = d; |
122 | bank_switch(d); |
123 | } |
124 | break; |
5e49c3a8 |
125 | } |
126 | } |
127 | |
128 | static void p32x_reg_write16(u32 a, u32 d) |
129 | { |
acd35d4c |
130 | u16 *r = Pico32x.regs; |
131 | a &= 0x3e; |
132 | |
133 | switch (a) { |
134 | case 0: |
135 | r[0] = (r[0] & 0x83) | (d & P32XS_FM); |
136 | return; |
137 | } |
138 | |
139 | if ((a & 0x30) == 0x20) { |
140 | r[a / 2] = d; |
266c6afa |
141 | poll_undetect(&msh2_poll, P32XF_MSH2POLL); |
acd35d4c |
142 | return; |
143 | } |
144 | |
5e49c3a8 |
145 | p32x_reg_write8(a + 1, d); |
be2c4208 |
146 | } |
147 | |
148 | // VDP regs |
149 | static u32 p32x_vdp_read16(u32 a) |
150 | { |
151 | a &= 0x0e; |
152 | |
153 | return Pico32x.vdp_regs[a / 2]; |
154 | } |
155 | |
be2c4208 |
156 | static void p32x_vdp_write8(u32 a, u32 d) |
157 | { |
974fdb5b |
158 | u16 *r = Pico32x.vdp_regs; |
be2c4208 |
159 | a &= 0x0f; |
160 | |
974fdb5b |
161 | // TODO: verify what's writeable |
be2c4208 |
162 | switch (a) { |
974fdb5b |
163 | case 0x01: |
164 | if (((r[0] & 3) == 0) != ((d & 3) == 0)) { // forced blanking changed |
165 | if (Pico.video.status & 8) |
166 | r[0x0a/2] |= P32XV_VBLK; |
167 | else |
168 | r[0x0a/2] &= ~P32XV_VBLK; |
169 | } |
5e49c3a8 |
170 | // priority inversion is handled in palette |
171 | if ((r[0] ^ d) & P32XV_PRI) |
172 | Pico32x.dirty_pal = 1; |
974fdb5b |
173 | r[0] = (r[0] & P32XV_nPAL) | (d & 0xff); |
174 | break; |
be2c4208 |
175 | case 0x0b: |
974fdb5b |
176 | d &= 1; |
177 | Pico32x.pending_fb = d; |
178 | // if we are blanking and FS bit is changing |
179 | if ((r[0x0a/2] & P32XV_VBLK) && ((r[0x0a/2] ^ d) & P32XV_FS)) { |
180 | r[0x0a/2] ^= 1; |
181 | Pico32xSwapDRAM(d ^ 1); |
266c6afa |
182 | elprintf(EL_32X, "VDP FS: %d", r[0x0a/2] & P32XV_FS); |
be2c4208 |
183 | } |
184 | break; |
185 | } |
186 | } |
187 | |
974fdb5b |
188 | static void p32x_vdp_write16(u32 a, u32 d) |
189 | { |
190 | p32x_vdp_write8(a | 1, d); |
191 | } |
192 | |
acd35d4c |
193 | // SH2 regs |
194 | static u32 p32x_sh2reg_read16(u32 a) |
195 | { |
196 | a &= 0xff; // ? |
266c6afa |
197 | |
198 | if (poll_detect(&msh2_poll, a, ash2_pc(), P32XF_MSH2POLL)) |
199 | ash2_end_run(8); |
200 | |
acd35d4c |
201 | if (a == 0) { |
202 | return (Pico32x.regs[0] & P32XS_FM) | P32XS2_ADEN; |
203 | } |
266c6afa |
204 | if ((a & 0x30) == 0x20) |
205 | return Pico32x.regs[a / 2]; |
acd35d4c |
206 | |
207 | return 0; |
208 | } |
209 | |
210 | static void p32x_sh2reg_write8(u32 a, u32 d) |
211 | { |
212 | } |
213 | |
214 | static void p32x_sh2reg_write16(u32 a, u32 d) |
215 | { |
216 | a &= 0xff; |
217 | |
218 | if ((a & 0x30) == 0x20) { |
219 | Pico32x.regs[a/2] = d; |
266c6afa |
220 | if (poll_undetect(&m68k_poll, P32XF_68KPOLL)) |
221 | // dangerous, but let's just assume 68k program |
222 | // didn't issue STOP itself. |
223 | SekSetStop(0); |
acd35d4c |
224 | return; |
225 | } |
226 | |
227 | p32x_sh2reg_write8(a | 1, d); |
228 | } |
229 | |
be2c4208 |
230 | // default 32x handlers |
231 | u32 PicoRead8_32x(u32 a) |
232 | { |
233 | u32 d = 0; |
234 | if ((a & 0xffc0) == 0x5100) { // a15100 |
235 | d = p32x_reg_read16(a); |
236 | goto out_16to8; |
237 | } |
238 | |
974fdb5b |
239 | if (!(Pico32x.regs[0] & 1)) |
240 | goto no_vdp; |
241 | |
242 | if ((a & 0xfff0) == 0x5180) { // a15180 |
be2c4208 |
243 | d = p32x_vdp_read16(a); |
244 | goto out_16to8; |
245 | } |
246 | |
974fdb5b |
247 | if ((a & 0xfe00) == 0x5200) { // a15200 |
248 | d = Pico32xMem->pal[(a & 0x1ff) / 2]; |
249 | goto out_16to8; |
250 | } |
251 | |
252 | no_vdp: |
be2c4208 |
253 | if ((a & 0xfffc) == 0x30ec) { // a130ec |
254 | d = str_mars[a & 3]; |
255 | goto out; |
256 | } |
257 | |
258 | elprintf(EL_UIO, "m68k unmapped r8 [%06x] @%06x", a, SekPc); |
259 | return d; |
260 | |
261 | out_16to8: |
262 | if (a & 1) |
263 | d &= 0xff; |
264 | else |
265 | d >>= 8; |
266 | |
267 | out: |
268 | elprintf(EL_32X, "m68k 32x r8 [%06x] %02x @%06x", a, d, SekPc); |
269 | return d; |
270 | } |
271 | |
272 | u32 PicoRead16_32x(u32 a) |
273 | { |
274 | u32 d = 0; |
275 | if ((a & 0xffc0) == 0x5100) { // a15100 |
276 | d = p32x_reg_read16(a); |
277 | goto out; |
278 | } |
279 | |
974fdb5b |
280 | if (!(Pico32x.regs[0] & 1)) |
281 | goto no_vdp; |
282 | |
283 | if ((a & 0xfff0) == 0x5180) { // a15180 |
be2c4208 |
284 | d = p32x_vdp_read16(a); |
285 | goto out; |
286 | } |
287 | |
974fdb5b |
288 | if ((a & 0xfe00) == 0x5200) { // a15200 |
289 | d = Pico32xMem->pal[(a & 0x1ff) / 2]; |
290 | goto out; |
291 | } |
292 | |
293 | no_vdp: |
be2c4208 |
294 | if ((a & 0xfffc) == 0x30ec) { // a130ec |
295 | d = !(a & 2) ? ('M'<<8)|'A' : ('R'<<8)|'S'; |
296 | goto out; |
297 | } |
298 | |
299 | elprintf(EL_UIO, "m68k unmapped r16 [%06x] @%06x", a, SekPc); |
300 | return d; |
301 | |
302 | out: |
303 | elprintf(EL_32X, "m68k 32x r16 [%06x] %04x @%06x", a, d, SekPc); |
304 | return d; |
305 | } |
306 | |
307 | void PicoWrite8_32x(u32 a, u32 d) |
308 | { |
309 | if ((a & 0xfc00) == 0x5000) |
310 | elprintf(EL_32X, "m68k 32x w8 [%06x] %02x @%06x", a, d & 0xff, SekPc); |
311 | |
312 | if ((a & 0xffc0) == 0x5100) { // a15100 |
313 | p32x_reg_write8(a, d); |
314 | return; |
315 | } |
316 | |
974fdb5b |
317 | if (!(Pico32x.regs[0] & 1)) |
318 | goto no_vdp; |
319 | |
320 | if ((a & 0xfff0) == 0x5180) { // a15180 |
be2c4208 |
321 | p32x_vdp_write8(a, d); |
322 | return; |
323 | } |
324 | |
974fdb5b |
325 | // TODO: verify |
326 | if ((a & 0xfe00) == 0x5200) { // a15200 |
327 | elprintf(EL_32X|EL_ANOMALY, "m68k 32x PAL w8 [%06x] %02x @%06x", a, d & 0xff, SekPc); |
328 | ((u8 *)Pico32xMem->pal)[(a & 0x1ff) ^ 1] = d; |
329 | Pico32x.dirty_pal = 1; |
330 | return; |
331 | } |
332 | |
333 | no_vdp: |
be2c4208 |
334 | elprintf(EL_UIO, "m68k unmapped w8 [%06x] %02x @%06x", a, d & 0xff, SekPc); |
335 | } |
336 | |
337 | void PicoWrite16_32x(u32 a, u32 d) |
338 | { |
339 | if ((a & 0xfc00) == 0x5000) |
340 | elprintf(EL_UIO, "m68k 32x w16 [%06x] %04x @%06x", a, d & 0xffff, SekPc); |
341 | |
342 | if ((a & 0xffc0) == 0x5100) { // a15100 |
343 | p32x_reg_write16(a, d); |
344 | return; |
345 | } |
346 | |
974fdb5b |
347 | if (!(Pico32x.regs[0] & 1)) |
348 | goto no_vdp; |
349 | |
350 | if ((a & 0xfff0) == 0x5180) { // a15180 |
be2c4208 |
351 | p32x_vdp_write16(a, d); |
352 | return; |
353 | } |
354 | |
974fdb5b |
355 | if ((a & 0xfe00) == 0x5200) { // a15200 |
356 | Pico32xMem->pal[(a & 0x1ff) / 2] = d; |
357 | Pico32x.dirty_pal = 1; |
358 | return; |
359 | } |
360 | |
361 | no_vdp: |
be2c4208 |
362 | elprintf(EL_UIO, "m68k unmapped w16 [%06x] %04x @%06x", a, d & 0xffff, SekPc); |
363 | } |
364 | |
365 | // hint vector is writeable |
366 | static void PicoWrite8_hint(u32 a, u32 d) |
367 | { |
368 | if ((a & 0xfffc) == 0x0070) { |
369 | Pico32xMem->m68k_rom[a ^ 1] = d; |
370 | return; |
371 | } |
372 | |
373 | elprintf(EL_UIO, "m68k unmapped w8 [%06x] %02x @%06x", a, d & 0xff, SekPc); |
374 | } |
375 | |
376 | static void PicoWrite16_hint(u32 a, u32 d) |
377 | { |
378 | if ((a & 0xfffc) == 0x0070) { |
379 | ((u16 *)Pico32xMem->m68k_rom)[a/2] = d; |
380 | return; |
381 | } |
382 | |
383 | elprintf(EL_UIO, "m68k unmapped w16 [%06x] %04x @%06x", a, d & 0xffff, SekPc); |
384 | } |
385 | |
974fdb5b |
386 | void Pico32xSwapDRAM(int b) |
387 | { |
388 | cpu68k_map_set(m68k_read8_map, 0x840000, 0x85ffff, Pico32xMem->dram[b], 0); |
389 | cpu68k_map_set(m68k_read16_map, 0x840000, 0x85ffff, Pico32xMem->dram[b], 0); |
390 | cpu68k_map_set(m68k_write8_map, 0x840000, 0x85ffff, Pico32xMem->dram[b], 0); |
391 | cpu68k_map_set(m68k_write16_map, 0x840000, 0x85ffff, Pico32xMem->dram[b], 0); |
392 | } |
393 | |
5e49c3a8 |
394 | static void bank_switch(int b) |
395 | { |
396 | unsigned int rs, bank; |
397 | |
398 | bank = b << 20; |
399 | if (bank >= Pico.romsize) { |
400 | elprintf(EL_32X|EL_ANOMALY, "missing bank @ %06x", bank); |
401 | return; |
402 | } |
403 | |
404 | // 32X ROM (unbanked, XXX: consider mirroring?) |
405 | rs = (Pico.romsize + M68K_BANK_MASK) & ~M68K_BANK_MASK; |
406 | rs -= bank; |
407 | if (rs > 0x100000) |
408 | rs = 0x100000; |
409 | cpu68k_map_set(m68k_read8_map, 0x900000, 0x900000 + rs - 1, Pico.rom + bank, 0); |
410 | cpu68k_map_set(m68k_read16_map, 0x900000, 0x900000 + rs - 1, Pico.rom + bank, 0); |
411 | |
412 | elprintf(EL_32X, "bank %06x-%06x -> %06x", 0x900000, 0x900000 + rs - 1, bank); |
413 | } |
414 | |
acd35d4c |
415 | // ----------------------------------------------------------------- |
416 | // SH2 |
417 | // ----------------------------------------------------------------- |
418 | |
419 | u32 pico32x_read8(u32 a) |
420 | { |
421 | u32 d = 0; |
422 | if (a < sizeof(Pico32xMem->sh2_rom_m)) |
423 | return Pico32xMem->sh2_rom_m[a ^ 1]; |
424 | |
425 | if ((a & 0x0ffc0000) == 0x06000000) |
426 | return Pico32xMem->sdram[(a & 0x3ffff) ^ 1]; |
427 | |
428 | if ((a & 0x0fc00000) == 0x02000000) |
429 | if ((a & 0x003fffff) < Pico.romsize) |
430 | return Pico.rom[(a & 0x3fffff) ^ 1]; |
431 | |
432 | if ((a & 0x0fffff00) == 0x4000) { |
433 | d = p32x_sh2reg_read16(a); |
434 | goto out_16to8; |
435 | } |
436 | |
437 | if ((a & 0x0fffff00) == 0x4100) { |
438 | d = p32x_vdp_read16(a); |
439 | goto out_16to8; |
440 | } |
441 | |
442 | if ((a & 0x0fffff00) == 0x4200) { |
443 | d = Pico32xMem->pal[(a & 0x1ff) / 2]; |
444 | goto out_16to8; |
445 | } |
446 | |
447 | elprintf(EL_UIO, "sh2 unmapped r8 [%08x] %02x @%06x", a, d, ash2_pc()); |
448 | return d; |
449 | |
450 | out_16to8: |
451 | if (a & 1) |
452 | d &= 0xff; |
453 | else |
454 | d >>= 8; |
455 | |
456 | elprintf(EL_32X, "sh2 r8 [%08x] %02x @%06x", a, d, ash2_pc()); |
457 | return d; |
458 | } |
459 | |
460 | u32 pico32x_read16(u32 a) |
461 | { |
462 | u32 d = 0; |
463 | if (a < sizeof(Pico32xMem->sh2_rom_m)) |
464 | return *(u16 *)(Pico32xMem->sh2_rom_m + a); |
465 | |
466 | if ((a & 0x0ffc0000) == 0x06000000) |
467 | return ((u16 *)Pico32xMem->sdram)[(a & 0x3ffff) / 2]; |
468 | |
469 | if ((a & 0x0fc00000) == 0x02000000) |
470 | if ((a & 0x003fffff) < Pico.romsize) |
471 | return ((u16 *)Pico.rom)[(a & 0x3fffff) / 2]; |
472 | |
473 | if ((a & 0x0fffff00) == 0x4000) { |
474 | d = p32x_sh2reg_read16(a); |
475 | goto out; |
476 | } |
477 | |
478 | if ((a & 0x0fffff00) == 0x4100) { |
479 | d = p32x_vdp_read16(a); |
480 | goto out; |
481 | } |
482 | |
483 | if ((a & 0x0fffff00) == 0x4200) { |
484 | d = Pico32xMem->pal[(a & 0x1ff) / 2]; |
485 | goto out; |
486 | } |
487 | |
488 | elprintf(EL_UIO, "sh2 unmapped r16 [%08x] %04x @%06x", a, d, ash2_pc()); |
489 | return d; |
490 | |
491 | out: |
492 | elprintf(EL_32X, "sh2 r16 [%08x] %04x @%06x", a, d, ash2_pc()); |
493 | return d; |
494 | } |
495 | |
496 | u32 pico32x_read32(u32 a) |
497 | { |
498 | // elprintf(EL_UIO, "sh2 r32 [%08x] %08x @%06x", a, d, ash2_pc()); |
499 | return (pico32x_read16(a) << 16) | pico32x_read16(a + 2); |
500 | } |
501 | |
502 | void pico32x_write8(u32 a, u32 d) |
503 | { |
504 | if ((a & 0x0ffffc00) == 0x4000) |
505 | elprintf(EL_32X, "sh2 w8 [%08x] %02x @%06x", a, d & 0xff, ash2_pc()); |
506 | |
507 | if ((a & 0x0ffc0000) == 0x06000000) { |
508 | Pico32xMem->sdram[(a & 0x3ffff) ^ 1] = d; |
509 | return; |
510 | } |
511 | |
266c6afa |
512 | if ((a & 0x0ffe0000) == 0x04000000) { |
513 | u8 *dram = (u8 *)Pico32xMem->dram[(Pico32x.vdp_regs[0x0a/2] & P32XV_FS) ^ 1]; |
514 | dram[(a & 0x1ffff) ^ 1] = d; |
515 | return; |
516 | } |
517 | |
acd35d4c |
518 | if ((a & 0x0fffff00) == 0x4100) { |
519 | p32x_vdp_write8(a, d); |
520 | return; |
521 | } |
522 | |
523 | if ((a & 0x0fffff00) == 0x4000) { |
524 | p32x_sh2reg_write8(a, d); |
525 | return; |
526 | } |
527 | |
528 | elprintf(EL_UIO, "sh2 unmapped w8 [%08x] %02x @%06x", a, d & 0xff, ash2_pc()); |
529 | } |
530 | |
531 | void pico32x_write16(u32 a, u32 d) |
532 | { |
533 | if ((a & 0x0ffffc00) == 0x4000) |
534 | elprintf(EL_32X, "sh2 w16 [%08x] %04x @%06x", a, d & 0xffff, ash2_pc()); |
535 | |
536 | if ((a & 0x0ffc0000) == 0x06000000) { |
537 | ((u16 *)Pico32xMem->sdram)[(a & 0x3ffff) / 2] = d; |
538 | return; |
539 | } |
540 | |
266c6afa |
541 | if ((a & 0x0ffe0000) == 0x04000000) { |
542 | Pico32xMem->dram[(Pico32x.vdp_regs[0x0a/2] & P32XV_FS) ^ 1][(a & 0x1ffff) / 2] = d; |
543 | return; |
544 | } |
545 | |
acd35d4c |
546 | if ((a & 0x0fffff00) == 0x4100) { |
547 | p32x_vdp_write16(a, d); |
548 | return; |
549 | } |
550 | |
551 | if ((a & 0x0ffffe00) == 0x4200) { |
552 | Pico32xMem->pal[(a & 0x1ff) / 2] = d; |
553 | Pico32x.dirty_pal = 1; |
554 | return; |
555 | } |
556 | |
557 | if ((a & 0x0fffff00) == 0x4000) { |
558 | p32x_sh2reg_write16(a, d); |
559 | return; |
560 | } |
561 | |
562 | elprintf(EL_UIO, "sh2 unmapped w16 [%08x] %04x @%06x", a, d & 0xffff, ash2_pc()); |
563 | } |
564 | |
565 | void pico32x_write32(u32 a, u32 d) |
566 | { |
567 | // elprintf(EL_UIO, "sh2 w32 [%08x] %08x @%06x", a, d, ash2_pc()); |
568 | pico32x_write16(a, d >> 16); |
569 | pico32x_write16(a + 2, d); |
570 | } |
571 | |
be2c4208 |
572 | #define HWSWAP(x) (((x) << 16) | ((x) >> 16)) |
573 | void PicoMemSetup32x(void) |
574 | { |
575 | unsigned short *ps; |
576 | unsigned int *pl; |
5e49c3a8 |
577 | unsigned int rs; |
be2c4208 |
578 | int i; |
579 | |
580 | Pico32xMem = calloc(1, sizeof(*Pico32xMem)); |
581 | if (Pico32xMem == NULL) { |
582 | elprintf(EL_STATUS, "OOM"); |
583 | return; |
584 | } |
585 | |
586 | // generate 68k ROM |
587 | ps = (unsigned short *)Pico32xMem->m68k_rom; |
588 | pl = (unsigned int *)Pico32xMem->m68k_rom; |
589 | for (i = 1; i < 0xc0/4; i++) |
974fdb5b |
590 | pl[i] = HWSWAP(0x880200 + (i - 1) * 6); |
be2c4208 |
591 | |
592 | // fill with nops |
593 | for (i = 0xc0/2; i < 0x100/2; i++) |
594 | ps[i] = 0x4e71; |
595 | |
5e49c3a8 |
596 | #if 0 |
be2c4208 |
597 | ps[0xc0/2] = 0x46fc; |
598 | ps[0xc2/2] = 0x2700; // move #0x2700,sr |
599 | ps[0xfe/2] = 0x60fe; // jump to self |
5e49c3a8 |
600 | #else |
601 | ps[0xfe/2] = 0x4e75; // rts |
602 | #endif |
be2c4208 |
603 | |
604 | // fill remaining mem with ROM |
974fdb5b |
605 | memcpy(Pico32xMem->m68k_rom + 0x100, Pico.rom + 0x100, sizeof(Pico32xMem->m68k_rom) - 0x100); |
be2c4208 |
606 | |
acd35d4c |
607 | // 32X ROM |
608 | // TODO: move |
609 | { |
610 | FILE *f = fopen("32X_M_BIOS.BIN", "rb"); |
611 | int i; |
612 | if (f == NULL) { |
613 | printf("missing BIOS\n"); |
614 | exit(1); |
615 | } |
616 | fread(Pico32xMem->sh2_rom_m, 1, sizeof(Pico32xMem->sh2_rom_m), f); |
617 | fclose(f); |
618 | for (i = 0; i < sizeof(Pico32xMem->sh2_rom_m); i += 2) { |
619 | int t = Pico32xMem->sh2_rom_m[i]; |
620 | Pico32xMem->sh2_rom_m[i] = Pico32xMem->sh2_rom_m[i + 1]; |
621 | Pico32xMem->sh2_rom_m[i + 1] = t; |
622 | } |
623 | } |
624 | |
be2c4208 |
625 | // cartridge area becomes unmapped |
626 | // XXX: we take the easy way and don't unmap ROM, |
627 | // so that we can avoid handling the RV bit. |
628 | // m68k_map_unmap(0x000000, 0x3fffff); |
629 | |
630 | // MD ROM area |
974fdb5b |
631 | rs = sizeof(Pico32xMem->m68k_rom); |
632 | cpu68k_map_set(m68k_read8_map, 0x000000, rs - 1, Pico32xMem->m68k_rom, 0); |
633 | cpu68k_map_set(m68k_read16_map, 0x000000, rs - 1, Pico32xMem->m68k_rom, 0); |
634 | cpu68k_map_set(m68k_write8_map, 0x000000, rs - 1, PicoWrite8_hint, 1); // TODO verify |
635 | cpu68k_map_set(m68k_write16_map, 0x000000, rs - 1, PicoWrite16_hint, 1); |
636 | |
637 | // DRAM area |
638 | Pico32xSwapDRAM(1); |
be2c4208 |
639 | |
640 | // 32X ROM (unbanked, XXX: consider mirroring?) |
5e49c3a8 |
641 | rs = (Pico.romsize + M68K_BANK_MASK) & ~M68K_BANK_MASK; |
642 | if (rs > 0x80000) |
643 | rs = 0x80000; |
644 | cpu68k_map_set(m68k_read8_map, 0x880000, 0x880000 + rs - 1, Pico.rom, 0); |
645 | cpu68k_map_set(m68k_read16_map, 0x880000, 0x880000 + rs - 1, Pico.rom, 0); |
be2c4208 |
646 | |
647 | // 32X ROM (banked) |
5e49c3a8 |
648 | bank_switch(0); |
be2c4208 |
649 | } |
650 | |