| 1 | #include "../pico_int.h" |
| 2 | #include "../memory.h" |
| 3 | |
| 4 | static const char str_mars[] = "MARS"; |
| 5 | |
| 6 | struct Pico32xMem *Pico32xMem; |
| 7 | |
| 8 | static void bank_switch(int b); |
| 9 | |
| 10 | #define MSB8(x) ((x) >> 8) |
| 11 | |
| 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 | |
| 54 | // SH2 faking |
| 55 | #define FAKE_SH2 |
| 56 | int p32x_csum_faked; |
| 57 | #ifdef FAKE_SH2 |
| 58 | static const u16 comm_fakevals[] = { |
| 59 | 0x4d5f, 0x4f4b, // M_OK |
| 60 | 0x535f, 0x4f4b, // S_OK |
| 61 | 0x4D41, 0x5346, // MASF - Brutal Unleashed |
| 62 | 0x5331, 0x4d31, // Darxide |
| 63 | 0x5332, 0x4d32, |
| 64 | 0x5333, 0x4d33, |
| 65 | 0x0000, 0x0000, // eq for doom |
| 66 | 0x0002, // Mortal Kombat |
| 67 | // 0, // pad |
| 68 | }; |
| 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 |
| 82 | |
| 83 | static u32 p32x_reg_read16(u32 a) |
| 84 | { |
| 85 | a &= 0x3e; |
| 86 | |
| 87 | #if 0 |
| 88 | if ((a & 0x30) == 0x20) |
| 89 | return sh2_comm_faker(a); |
| 90 | #else |
| 91 | if (poll_detect(&m68k_poll, a, SekPc, P32XF_68KPOLL)) { |
| 92 | SekSetStop(1); |
| 93 | SekEndRun(16); |
| 94 | } |
| 95 | #endif |
| 96 | #ifdef FAKE_SH2 |
| 97 | // fake only slave for now |
| 98 | if (a == 0x24 || a == 0x26) |
| 99 | return sh2_comm_faker(a); |
| 100 | #endif |
| 101 | |
| 102 | return Pico32x.regs[a / 2]; |
| 103 | } |
| 104 | |
| 105 | static void p32x_reg_write8(u32 a, u32 d) |
| 106 | { |
| 107 | u16 *r = Pico32x.regs; |
| 108 | a &= 0x3f; |
| 109 | |
| 110 | if (a == 1 && !(r[0] & 1)) { |
| 111 | r[0] |= 1; |
| 112 | Pico32xStartup(); |
| 113 | return; |
| 114 | } |
| 115 | |
| 116 | if (!(r[0] & 1)) |
| 117 | return; |
| 118 | |
| 119 | switch (a) { |
| 120 | case 0: |
| 121 | r[0] = (r[0] & 0x83) | ((d << 8) & P32XS_FM); |
| 122 | break; |
| 123 | case 5: |
| 124 | d &= 7; |
| 125 | if (r[4/2] != d) { |
| 126 | r[4/2] = d; |
| 127 | bank_switch(d); |
| 128 | } |
| 129 | break; |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | static void p32x_reg_write16(u32 a, u32 d) |
| 134 | { |
| 135 | u16 *r = Pico32x.regs; |
| 136 | a &= 0x3e; |
| 137 | |
| 138 | switch (a) { |
| 139 | case 0: |
| 140 | r[0] = (r[0] & 0x83) | (d & P32XS_FM); |
| 141 | return; |
| 142 | } |
| 143 | |
| 144 | if ((a & 0x30) == 0x20 && r[a / 2] != d) { |
| 145 | r[a / 2] = d; |
| 146 | if (poll_undetect(&msh2_poll, P32XF_MSH2POLL)) |
| 147 | // if SH2 is busy waiting, it needs to see the result ASAP |
| 148 | SekEndRun(16); |
| 149 | return; |
| 150 | } |
| 151 | |
| 152 | p32x_reg_write8(a + 1, d); |
| 153 | } |
| 154 | |
| 155 | // VDP regs |
| 156 | static u32 p32x_vdp_read16(u32 a) |
| 157 | { |
| 158 | a &= 0x0e; |
| 159 | |
| 160 | return Pico32x.vdp_regs[a / 2]; |
| 161 | } |
| 162 | |
| 163 | static void p32x_vdp_write8(u32 a, u32 d) |
| 164 | { |
| 165 | u16 *r = Pico32x.vdp_regs; |
| 166 | a &= 0x0f; |
| 167 | |
| 168 | // TODO: verify what's writeable |
| 169 | switch (a) { |
| 170 | case 0x01: |
| 171 | if (((r[0] & 3) == 0) != ((d & 3) == 0)) { // forced blanking changed |
| 172 | if (Pico.video.status & 8) |
| 173 | r[0x0a/2] |= P32XV_VBLK; |
| 174 | else |
| 175 | r[0x0a/2] &= ~P32XV_VBLK; |
| 176 | } |
| 177 | // priority inversion is handled in palette |
| 178 | if ((r[0] ^ d) & P32XV_PRI) |
| 179 | Pico32x.dirty_pal = 1; |
| 180 | r[0] = (r[0] & P32XV_nPAL) | (d & 0xff); |
| 181 | break; |
| 182 | case 0x0b: |
| 183 | d &= 1; |
| 184 | Pico32x.pending_fb = d; |
| 185 | // if we are blanking and FS bit is changing |
| 186 | if ((r[0x0a/2] & P32XV_VBLK) && ((r[0x0a/2] ^ d) & P32XV_FS)) { |
| 187 | r[0x0a/2] ^= 1; |
| 188 | Pico32xSwapDRAM(d ^ 1); |
| 189 | elprintf(EL_32X, "VDP FS: %d", r[0x0a/2] & P32XV_FS); |
| 190 | } |
| 191 | break; |
| 192 | } |
| 193 | } |
| 194 | |
| 195 | static void p32x_vdp_write16(u32 a, u32 d) |
| 196 | { |
| 197 | p32x_vdp_write8(a | 1, d); |
| 198 | } |
| 199 | |
| 200 | // SH2 regs |
| 201 | static u32 p32x_sh2reg_read16(u32 a) |
| 202 | { |
| 203 | a &= 0xff; // ? |
| 204 | |
| 205 | if (poll_detect(&msh2_poll, a, ash2_pc(), P32XF_MSH2POLL)) |
| 206 | ash2_end_run(8); |
| 207 | |
| 208 | if (a == 0) { |
| 209 | return (Pico32x.regs[0] & P32XS_FM) | P32XS2_ADEN; |
| 210 | } |
| 211 | if ((a & 0x30) == 0x20) |
| 212 | return Pico32x.regs[a / 2]; |
| 213 | |
| 214 | return 0; |
| 215 | } |
| 216 | |
| 217 | static void p32x_sh2reg_write8(u32 a, u32 d) |
| 218 | { |
| 219 | } |
| 220 | |
| 221 | static void p32x_sh2reg_write16(u32 a, u32 d) |
| 222 | { |
| 223 | a &= 0xff; |
| 224 | |
| 225 | if ((a & 0x30) == 0x20) { |
| 226 | Pico32x.regs[a/2] = d; |
| 227 | if (poll_undetect(&m68k_poll, P32XF_68KPOLL)) |
| 228 | // dangerous, but let's just assume 68k program |
| 229 | // didn't issue STOP itself. |
| 230 | SekSetStop(0); |
| 231 | return; |
| 232 | } |
| 233 | |
| 234 | p32x_sh2reg_write8(a | 1, d); |
| 235 | } |
| 236 | |
| 237 | // default 32x handlers |
| 238 | u32 PicoRead8_32x(u32 a) |
| 239 | { |
| 240 | u32 d = 0; |
| 241 | if ((a & 0xffc0) == 0x5100) { // a15100 |
| 242 | d = p32x_reg_read16(a); |
| 243 | goto out_16to8; |
| 244 | } |
| 245 | |
| 246 | if (!(Pico32x.regs[0] & 1)) |
| 247 | goto no_vdp; |
| 248 | |
| 249 | if ((a & 0xfff0) == 0x5180) { // a15180 |
| 250 | d = p32x_vdp_read16(a); |
| 251 | goto out_16to8; |
| 252 | } |
| 253 | |
| 254 | if ((a & 0xfe00) == 0x5200) { // a15200 |
| 255 | d = Pico32xMem->pal[(a & 0x1ff) / 2]; |
| 256 | goto out_16to8; |
| 257 | } |
| 258 | |
| 259 | no_vdp: |
| 260 | if ((a & 0xfffc) == 0x30ec) { // a130ec |
| 261 | d = str_mars[a & 3]; |
| 262 | goto out; |
| 263 | } |
| 264 | |
| 265 | elprintf(EL_UIO, "m68k unmapped r8 [%06x] @%06x", a, SekPc); |
| 266 | return d; |
| 267 | |
| 268 | out_16to8: |
| 269 | if (a & 1) |
| 270 | d &= 0xff; |
| 271 | else |
| 272 | d >>= 8; |
| 273 | |
| 274 | out: |
| 275 | elprintf(EL_32X, "m68k 32x r8 [%06x] %02x @%06x", a, d, SekPc); |
| 276 | return d; |
| 277 | } |
| 278 | |
| 279 | u32 PicoRead16_32x(u32 a) |
| 280 | { |
| 281 | u32 d = 0; |
| 282 | if ((a & 0xffc0) == 0x5100) { // a15100 |
| 283 | d = p32x_reg_read16(a); |
| 284 | goto out; |
| 285 | } |
| 286 | |
| 287 | if (!(Pico32x.regs[0] & 1)) |
| 288 | goto no_vdp; |
| 289 | |
| 290 | if ((a & 0xfff0) == 0x5180) { // a15180 |
| 291 | d = p32x_vdp_read16(a); |
| 292 | goto out; |
| 293 | } |
| 294 | |
| 295 | if ((a & 0xfe00) == 0x5200) { // a15200 |
| 296 | d = Pico32xMem->pal[(a & 0x1ff) / 2]; |
| 297 | goto out; |
| 298 | } |
| 299 | |
| 300 | no_vdp: |
| 301 | if ((a & 0xfffc) == 0x30ec) { // a130ec |
| 302 | d = !(a & 2) ? ('M'<<8)|'A' : ('R'<<8)|'S'; |
| 303 | goto out; |
| 304 | } |
| 305 | |
| 306 | elprintf(EL_UIO, "m68k unmapped r16 [%06x] @%06x", a, SekPc); |
| 307 | return d; |
| 308 | |
| 309 | out: |
| 310 | elprintf(EL_32X, "m68k 32x r16 [%06x] %04x @%06x", a, d, SekPc); |
| 311 | return d; |
| 312 | } |
| 313 | |
| 314 | void PicoWrite8_32x(u32 a, u32 d) |
| 315 | { |
| 316 | if ((a & 0xfc00) == 0x5000) |
| 317 | elprintf(EL_32X, "m68k 32x w8 [%06x] %02x @%06x", a, d & 0xff, SekPc); |
| 318 | |
| 319 | if ((a & 0xffc0) == 0x5100) { // a15100 |
| 320 | p32x_reg_write8(a, d); |
| 321 | return; |
| 322 | } |
| 323 | |
| 324 | if (!(Pico32x.regs[0] & 1)) |
| 325 | goto no_vdp; |
| 326 | |
| 327 | if ((a & 0xfff0) == 0x5180) { // a15180 |
| 328 | p32x_vdp_write8(a, d); |
| 329 | return; |
| 330 | } |
| 331 | |
| 332 | // TODO: verify |
| 333 | if ((a & 0xfe00) == 0x5200) { // a15200 |
| 334 | elprintf(EL_32X|EL_ANOMALY, "m68k 32x PAL w8 [%06x] %02x @%06x", a, d & 0xff, SekPc); |
| 335 | ((u8 *)Pico32xMem->pal)[(a & 0x1ff) ^ 1] = d; |
| 336 | Pico32x.dirty_pal = 1; |
| 337 | return; |
| 338 | } |
| 339 | |
| 340 | no_vdp: |
| 341 | elprintf(EL_UIO, "m68k unmapped w8 [%06x] %02x @%06x", a, d & 0xff, SekPc); |
| 342 | } |
| 343 | |
| 344 | void PicoWrite16_32x(u32 a, u32 d) |
| 345 | { |
| 346 | if ((a & 0xfc00) == 0x5000) |
| 347 | elprintf(EL_UIO, "m68k 32x w16 [%06x] %04x @%06x", a, d & 0xffff, SekPc); |
| 348 | |
| 349 | if ((a & 0xffc0) == 0x5100) { // a15100 |
| 350 | p32x_reg_write16(a, d); |
| 351 | return; |
| 352 | } |
| 353 | |
| 354 | if (!(Pico32x.regs[0] & 1)) |
| 355 | goto no_vdp; |
| 356 | |
| 357 | if ((a & 0xfff0) == 0x5180) { // a15180 |
| 358 | p32x_vdp_write16(a, d); |
| 359 | return; |
| 360 | } |
| 361 | |
| 362 | if ((a & 0xfe00) == 0x5200) { // a15200 |
| 363 | Pico32xMem->pal[(a & 0x1ff) / 2] = d; |
| 364 | Pico32x.dirty_pal = 1; |
| 365 | return; |
| 366 | } |
| 367 | |
| 368 | no_vdp: |
| 369 | elprintf(EL_UIO, "m68k unmapped w16 [%06x] %04x @%06x", a, d & 0xffff, SekPc); |
| 370 | } |
| 371 | |
| 372 | // hint vector is writeable |
| 373 | static void PicoWrite8_hint(u32 a, u32 d) |
| 374 | { |
| 375 | if ((a & 0xfffc) == 0x0070) { |
| 376 | Pico32xMem->m68k_rom[a ^ 1] = d; |
| 377 | return; |
| 378 | } |
| 379 | |
| 380 | elprintf(EL_UIO, "m68k unmapped w8 [%06x] %02x @%06x", a, d & 0xff, SekPc); |
| 381 | } |
| 382 | |
| 383 | static void PicoWrite16_hint(u32 a, u32 d) |
| 384 | { |
| 385 | if ((a & 0xfffc) == 0x0070) { |
| 386 | ((u16 *)Pico32xMem->m68k_rom)[a/2] = d; |
| 387 | return; |
| 388 | } |
| 389 | |
| 390 | elprintf(EL_UIO, "m68k unmapped w16 [%06x] %04x @%06x", a, d & 0xffff, SekPc); |
| 391 | } |
| 392 | |
| 393 | void Pico32xSwapDRAM(int b) |
| 394 | { |
| 395 | cpu68k_map_set(m68k_read8_map, 0x840000, 0x85ffff, Pico32xMem->dram[b], 0); |
| 396 | cpu68k_map_set(m68k_read16_map, 0x840000, 0x85ffff, Pico32xMem->dram[b], 0); |
| 397 | cpu68k_map_set(m68k_write8_map, 0x840000, 0x85ffff, Pico32xMem->dram[b], 0); |
| 398 | cpu68k_map_set(m68k_write16_map, 0x840000, 0x85ffff, Pico32xMem->dram[b], 0); |
| 399 | } |
| 400 | |
| 401 | static void bank_switch(int b) |
| 402 | { |
| 403 | unsigned int rs, bank; |
| 404 | |
| 405 | bank = b << 20; |
| 406 | if (bank >= Pico.romsize) { |
| 407 | elprintf(EL_32X|EL_ANOMALY, "missing bank @ %06x", bank); |
| 408 | return; |
| 409 | } |
| 410 | |
| 411 | // 32X ROM (unbanked, XXX: consider mirroring?) |
| 412 | rs = (Pico.romsize + M68K_BANK_MASK) & ~M68K_BANK_MASK; |
| 413 | rs -= bank; |
| 414 | if (rs > 0x100000) |
| 415 | rs = 0x100000; |
| 416 | cpu68k_map_set(m68k_read8_map, 0x900000, 0x900000 + rs - 1, Pico.rom + bank, 0); |
| 417 | cpu68k_map_set(m68k_read16_map, 0x900000, 0x900000 + rs - 1, Pico.rom + bank, 0); |
| 418 | |
| 419 | elprintf(EL_32X, "bank %06x-%06x -> %06x", 0x900000, 0x900000 + rs - 1, bank); |
| 420 | } |
| 421 | |
| 422 | // ----------------------------------------------------------------- |
| 423 | // SH2 |
| 424 | // ----------------------------------------------------------------- |
| 425 | |
| 426 | u32 pico32x_read8(u32 a) |
| 427 | { |
| 428 | u32 d = 0; |
| 429 | if (a < sizeof(Pico32xMem->sh2_rom_m)) |
| 430 | return Pico32xMem->sh2_rom_m[a ^ 1]; |
| 431 | |
| 432 | if ((a & 0x0ffc0000) == 0x06000000) |
| 433 | return Pico32xMem->sdram[(a & 0x3ffff) ^ 1]; |
| 434 | |
| 435 | if ((a & 0x0fc00000) == 0x02000000) |
| 436 | if ((a & 0x003fffff) < Pico.romsize) |
| 437 | return Pico.rom[(a & 0x3fffff) ^ 1]; |
| 438 | |
| 439 | if ((a & 0x0fffff00) == 0x4000) { |
| 440 | d = p32x_sh2reg_read16(a); |
| 441 | goto out_16to8; |
| 442 | } |
| 443 | |
| 444 | if ((a & 0x0fffff00) == 0x4100) { |
| 445 | d = p32x_vdp_read16(a); |
| 446 | goto out_16to8; |
| 447 | } |
| 448 | |
| 449 | if ((a & 0x0fffff00) == 0x4200) { |
| 450 | d = Pico32xMem->pal[(a & 0x1ff) / 2]; |
| 451 | goto out_16to8; |
| 452 | } |
| 453 | |
| 454 | elprintf(EL_UIO, "sh2 unmapped r8 [%08x] %02x @%06x", a, d, ash2_pc()); |
| 455 | return d; |
| 456 | |
| 457 | out_16to8: |
| 458 | if (a & 1) |
| 459 | d &= 0xff; |
| 460 | else |
| 461 | d >>= 8; |
| 462 | |
| 463 | elprintf(EL_32X, "sh2 r8 [%08x] %02x @%06x", a, d, ash2_pc()); |
| 464 | return d; |
| 465 | } |
| 466 | |
| 467 | u32 pico32x_read16(u32 a) |
| 468 | { |
| 469 | u32 d = 0; |
| 470 | |
| 471 | if (a < sizeof(Pico32xMem->sh2_rom_m)) |
| 472 | return *(u16 *)(Pico32xMem->sh2_rom_m + a); |
| 473 | |
| 474 | if ((a & 0x0ffc0000) == 0x06000000) |
| 475 | return ((u16 *)Pico32xMem->sdram)[(a & 0x3ffff) / 2]; |
| 476 | |
| 477 | if ((a & 0x0fc00000) == 0x02000000) |
| 478 | if ((a & 0x003fffff) < Pico.romsize) |
| 479 | return ((u16 *)Pico.rom)[(a & 0x3fffff) / 2]; |
| 480 | |
| 481 | if ((a & 0x0fffff00) == 0x4000) { |
| 482 | d = p32x_sh2reg_read16(a); |
| 483 | goto out; |
| 484 | } |
| 485 | |
| 486 | if ((a & 0x0fffff00) == 0x4100) { |
| 487 | d = p32x_vdp_read16(a); |
| 488 | goto out; |
| 489 | } |
| 490 | |
| 491 | if ((a & 0x0fffff00) == 0x4200) { |
| 492 | d = Pico32xMem->pal[(a & 0x1ff) / 2]; |
| 493 | goto out; |
| 494 | } |
| 495 | |
| 496 | elprintf(EL_UIO, "sh2 unmapped r16 [%08x] %04x @%06x", a, d, ash2_pc()); |
| 497 | return d; |
| 498 | |
| 499 | out: |
| 500 | elprintf(EL_32X, "sh2 r16 [%08x] %04x @%06x", a, d, ash2_pc()); |
| 501 | return d; |
| 502 | } |
| 503 | |
| 504 | u32 pico32x_read32(u32 a) |
| 505 | { |
| 506 | // elprintf(EL_UIO, "sh2 r32 [%08x] %08x @%06x", a, d, ash2_pc()); |
| 507 | return (pico32x_read16(a) << 16) | pico32x_read16(a + 2); |
| 508 | } |
| 509 | |
| 510 | void pico32x_write8(u32 a, u32 d) |
| 511 | { |
| 512 | if ((a & 0x0ffffc00) == 0x4000) |
| 513 | elprintf(EL_32X, "sh2 w8 [%08x] %02x @%06x", a, d & 0xff, ash2_pc()); |
| 514 | |
| 515 | if ((a & 0x0ffc0000) == 0x06000000) { |
| 516 | Pico32xMem->sdram[(a & 0x3ffff) ^ 1] = d; |
| 517 | return; |
| 518 | } |
| 519 | |
| 520 | if ((a & 0x0ffe0000) == 0x04000000) { |
| 521 | u8 *dram = (u8 *)Pico32xMem->dram[(Pico32x.vdp_regs[0x0a/2] & P32XV_FS) ^ 1]; |
| 522 | dram[(a & 0x1ffff) ^ 1] = d; |
| 523 | return; |
| 524 | } |
| 525 | |
| 526 | if ((a & 0x0fffff00) == 0x4100) { |
| 527 | p32x_vdp_write8(a, d); |
| 528 | return; |
| 529 | } |
| 530 | |
| 531 | if ((a & 0x0fffff00) == 0x4000) { |
| 532 | p32x_sh2reg_write8(a, d); |
| 533 | return; |
| 534 | } |
| 535 | |
| 536 | elprintf(EL_UIO, "sh2 unmapped w8 [%08x] %02x @%06x", a, d & 0xff, ash2_pc()); |
| 537 | } |
| 538 | |
| 539 | void pico32x_write16(u32 a, u32 d) |
| 540 | { |
| 541 | if ((a & 0x0ffffc00) == 0x4000) |
| 542 | elprintf(EL_32X, "sh2 w16 [%08x] %04x @%06x", a, d & 0xffff, ash2_pc()); |
| 543 | |
| 544 | if ((a & 0x0ffc0000) == 0x06000000) { |
| 545 | ((u16 *)Pico32xMem->sdram)[(a & 0x3ffff) / 2] = d; |
| 546 | return; |
| 547 | } |
| 548 | |
| 549 | if ((a & 0x0ffe0000) == 0x04000000) { |
| 550 | Pico32xMem->dram[(Pico32x.vdp_regs[0x0a/2] & P32XV_FS) ^ 1][(a & 0x1ffff) / 2] = d; |
| 551 | return; |
| 552 | } |
| 553 | |
| 554 | if ((a & 0x0fffff00) == 0x4100) { |
| 555 | p32x_vdp_write16(a, d); |
| 556 | return; |
| 557 | } |
| 558 | |
| 559 | if ((a & 0x0ffffe00) == 0x4200) { |
| 560 | Pico32xMem->pal[(a & 0x1ff) / 2] = d; |
| 561 | Pico32x.dirty_pal = 1; |
| 562 | return; |
| 563 | } |
| 564 | |
| 565 | if ((a & 0x0fffff00) == 0x4000) { |
| 566 | p32x_sh2reg_write16(a, d); |
| 567 | return; |
| 568 | } |
| 569 | |
| 570 | elprintf(EL_UIO, "sh2 unmapped w16 [%08x] %04x @%06x", a, d & 0xffff, ash2_pc()); |
| 571 | } |
| 572 | |
| 573 | void pico32x_write32(u32 a, u32 d) |
| 574 | { |
| 575 | // elprintf(EL_UIO, "sh2 w32 [%08x] %08x @%06x", a, d, ash2_pc()); |
| 576 | pico32x_write16(a, d >> 16); |
| 577 | pico32x_write16(a + 2, d); |
| 578 | } |
| 579 | |
| 580 | #define HWSWAP(x) (((x) << 16) | ((x) >> 16)) |
| 581 | void PicoMemSetup32x(void) |
| 582 | { |
| 583 | unsigned short *ps; |
| 584 | unsigned int *pl; |
| 585 | unsigned int rs; |
| 586 | int i; |
| 587 | |
| 588 | Pico32xMem = calloc(1, sizeof(*Pico32xMem)); |
| 589 | if (Pico32xMem == NULL) { |
| 590 | elprintf(EL_STATUS, "OOM"); |
| 591 | return; |
| 592 | } |
| 593 | |
| 594 | // generate 68k ROM |
| 595 | ps = (unsigned short *)Pico32xMem->m68k_rom; |
| 596 | pl = (unsigned int *)Pico32xMem->m68k_rom; |
| 597 | for (i = 1; i < 0xc0/4; i++) |
| 598 | pl[i] = HWSWAP(0x880200 + (i - 1) * 6); |
| 599 | |
| 600 | // fill with nops |
| 601 | for (i = 0xc0/2; i < 0x100/2; i++) |
| 602 | ps[i] = 0x4e71; |
| 603 | |
| 604 | #if 0 |
| 605 | ps[0xc0/2] = 0x46fc; |
| 606 | ps[0xc2/2] = 0x2700; // move #0x2700,sr |
| 607 | ps[0xfe/2] = 0x60fe; // jump to self |
| 608 | #else |
| 609 | ps[0xfe/2] = 0x4e75; // rts |
| 610 | #endif |
| 611 | |
| 612 | // fill remaining mem with ROM |
| 613 | memcpy(Pico32xMem->m68k_rom + 0x100, Pico.rom + 0x100, sizeof(Pico32xMem->m68k_rom) - 0x100); |
| 614 | |
| 615 | // 32X ROM |
| 616 | // TODO: move |
| 617 | { |
| 618 | FILE *f = fopen("32X_M_BIOS.BIN", "rb"); |
| 619 | int i; |
| 620 | if (f == NULL) { |
| 621 | printf("missing BIOS\n"); |
| 622 | exit(1); |
| 623 | } |
| 624 | fread(Pico32xMem->sh2_rom_m, 1, sizeof(Pico32xMem->sh2_rom_m), f); |
| 625 | fclose(f); |
| 626 | for (i = 0; i < sizeof(Pico32xMem->sh2_rom_m); i += 2) { |
| 627 | int t = Pico32xMem->sh2_rom_m[i]; |
| 628 | Pico32xMem->sh2_rom_m[i] = Pico32xMem->sh2_rom_m[i + 1]; |
| 629 | Pico32xMem->sh2_rom_m[i + 1] = t; |
| 630 | } |
| 631 | } |
| 632 | |
| 633 | // cartridge area becomes unmapped |
| 634 | // XXX: we take the easy way and don't unmap ROM, |
| 635 | // so that we can avoid handling the RV bit. |
| 636 | // m68k_map_unmap(0x000000, 0x3fffff); |
| 637 | |
| 638 | // MD ROM area |
| 639 | rs = sizeof(Pico32xMem->m68k_rom); |
| 640 | cpu68k_map_set(m68k_read8_map, 0x000000, rs - 1, Pico32xMem->m68k_rom, 0); |
| 641 | cpu68k_map_set(m68k_read16_map, 0x000000, rs - 1, Pico32xMem->m68k_rom, 0); |
| 642 | cpu68k_map_set(m68k_write8_map, 0x000000, rs - 1, PicoWrite8_hint, 1); // TODO verify |
| 643 | cpu68k_map_set(m68k_write16_map, 0x000000, rs - 1, PicoWrite16_hint, 1); |
| 644 | |
| 645 | // DRAM area |
| 646 | Pico32xSwapDRAM(1); |
| 647 | |
| 648 | // 32X ROM (unbanked, XXX: consider mirroring?) |
| 649 | rs = (Pico.romsize + M68K_BANK_MASK) & ~M68K_BANK_MASK; |
| 650 | if (rs > 0x80000) |
| 651 | rs = 0x80000; |
| 652 | cpu68k_map_set(m68k_read8_map, 0x880000, 0x880000 + rs - 1, Pico.rom, 0); |
| 653 | cpu68k_map_set(m68k_read16_map, 0x880000, 0x880000 + rs - 1, Pico.rom, 0); |
| 654 | |
| 655 | // 32X ROM (banked) |
| 656 | bank_switch(0); |
| 657 | } |
| 658 | |