| 1 | #include "../pico_int.h" |
| 2 | #include "../memory.h" |
| 3 | |
| 4 | static const char str_mars[] = "MARS"; |
| 5 | |
| 6 | struct Pico32xMem *Pico32xMem; |
| 7 | |
| 8 | // SH2 faking |
| 9 | static const u16 comm_fakevals[] = { |
| 10 | 0x4d5f, 0x4f4b, // M_OK |
| 11 | 0x535f, 0x4f4b, // S_OK |
| 12 | 0x0002, // Mortal Kombat |
| 13 | 0, // pad |
| 14 | }; |
| 15 | |
| 16 | static u32 p32x_reg_read16(u32 a) |
| 17 | { |
| 18 | a &= 0x3e; |
| 19 | |
| 20 | // SH2 faker |
| 21 | if ((a & 0x30) == 0x20) |
| 22 | { |
| 23 | static int f = 0, csum_faked = 0; |
| 24 | if (a == 0x28 && !csum_faked) { |
| 25 | csum_faked = 1; |
| 26 | return *(unsigned short *)(Pico.rom + 0x18e); |
| 27 | } |
| 28 | if (f >= sizeof(comm_fakevals) / sizeof(comm_fakevals[0])) |
| 29 | f = 0; |
| 30 | return comm_fakevals[f++]; |
| 31 | } |
| 32 | |
| 33 | return Pico32x.regs[a / 2]; |
| 34 | } |
| 35 | |
| 36 | static void p32x_reg_write16(u32 a, u32 d) |
| 37 | { |
| 38 | a &= 0x3e; |
| 39 | |
| 40 | if (a == 0 && !(Pico32x.regs[0] & 1)) { |
| 41 | Pico32x.regs[0] |= 1; |
| 42 | Pico32xStartup(); |
| 43 | return; |
| 44 | } |
| 45 | } |
| 46 | |
| 47 | static void p32x_reg_write8(u32 a, u32 d) |
| 48 | { |
| 49 | a &= 0x3f; |
| 50 | |
| 51 | if (a == 1 && !(Pico32x.regs[0] & 1)) { |
| 52 | Pico32x.regs[0] |= 1; |
| 53 | Pico32xStartup(); |
| 54 | return; |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | // VDP regs |
| 59 | static u32 p32x_vdp_read16(u32 a) |
| 60 | { |
| 61 | a &= 0x0e; |
| 62 | |
| 63 | return Pico32x.vdp_regs[a / 2]; |
| 64 | } |
| 65 | |
| 66 | static void p32x_vdp_write8(u32 a, u32 d) |
| 67 | { |
| 68 | u16 *r = Pico32x.vdp_regs; |
| 69 | a &= 0x0f; |
| 70 | |
| 71 | // TODO: verify what's writeable |
| 72 | switch (a) { |
| 73 | case 0x01: |
| 74 | if (((r[0] & 3) == 0) != ((d & 3) == 0)) { // forced blanking changed |
| 75 | if (Pico.video.status & 8) |
| 76 | r[0x0a/2] |= P32XV_VBLK; |
| 77 | else |
| 78 | r[0x0a/2] &= ~P32XV_VBLK; |
| 79 | } |
| 80 | r[0] = (r[0] & P32XV_nPAL) | (d & 0xff); |
| 81 | break; |
| 82 | case 0x0b: |
| 83 | d &= 1; |
| 84 | Pico32x.pending_fb = d; |
| 85 | // if we are blanking and FS bit is changing |
| 86 | if ((r[0x0a/2] & P32XV_VBLK) && ((r[0x0a/2] ^ d) & P32XV_FS)) { |
| 87 | r[0x0a/2] ^= 1; |
| 88 | Pico32xSwapDRAM(d ^ 1); |
| 89 | } |
| 90 | break; |
| 91 | } |
| 92 | } |
| 93 | |
| 94 | static void p32x_vdp_write16(u32 a, u32 d) |
| 95 | { |
| 96 | p32x_vdp_write8(a | 1, d); |
| 97 | } |
| 98 | |
| 99 | // default 32x handlers |
| 100 | u32 PicoRead8_32x(u32 a) |
| 101 | { |
| 102 | u32 d = 0; |
| 103 | if ((a & 0xffc0) == 0x5100) { // a15100 |
| 104 | d = p32x_reg_read16(a); |
| 105 | goto out_16to8; |
| 106 | } |
| 107 | |
| 108 | if (!(Pico32x.regs[0] & 1)) |
| 109 | goto no_vdp; |
| 110 | |
| 111 | if ((a & 0xfff0) == 0x5180) { // a15180 |
| 112 | d = p32x_vdp_read16(a); |
| 113 | goto out_16to8; |
| 114 | } |
| 115 | |
| 116 | if ((a & 0xfe00) == 0x5200) { // a15200 |
| 117 | d = Pico32xMem->pal[(a & 0x1ff) / 2]; |
| 118 | goto out_16to8; |
| 119 | } |
| 120 | |
| 121 | no_vdp: |
| 122 | if ((a & 0xfffc) == 0x30ec) { // a130ec |
| 123 | d = str_mars[a & 3]; |
| 124 | goto out; |
| 125 | } |
| 126 | |
| 127 | elprintf(EL_UIO, "m68k unmapped r8 [%06x] @%06x", a, SekPc); |
| 128 | return d; |
| 129 | |
| 130 | out_16to8: |
| 131 | if (a & 1) |
| 132 | d &= 0xff; |
| 133 | else |
| 134 | d >>= 8; |
| 135 | |
| 136 | out: |
| 137 | elprintf(EL_32X, "m68k 32x r8 [%06x] %02x @%06x", a, d, SekPc); |
| 138 | return d; |
| 139 | } |
| 140 | |
| 141 | u32 PicoRead16_32x(u32 a) |
| 142 | { |
| 143 | u32 d = 0; |
| 144 | if ((a & 0xffc0) == 0x5100) { // a15100 |
| 145 | d = p32x_reg_read16(a); |
| 146 | goto out; |
| 147 | } |
| 148 | |
| 149 | if (!(Pico32x.regs[0] & 1)) |
| 150 | goto no_vdp; |
| 151 | |
| 152 | if ((a & 0xfff0) == 0x5180) { // a15180 |
| 153 | d = p32x_vdp_read16(a); |
| 154 | goto out; |
| 155 | } |
| 156 | |
| 157 | if ((a & 0xfe00) == 0x5200) { // a15200 |
| 158 | d = Pico32xMem->pal[(a & 0x1ff) / 2]; |
| 159 | goto out; |
| 160 | } |
| 161 | |
| 162 | no_vdp: |
| 163 | if ((a & 0xfffc) == 0x30ec) { // a130ec |
| 164 | d = !(a & 2) ? ('M'<<8)|'A' : ('R'<<8)|'S'; |
| 165 | goto out; |
| 166 | } |
| 167 | |
| 168 | elprintf(EL_UIO, "m68k unmapped r16 [%06x] @%06x", a, SekPc); |
| 169 | return d; |
| 170 | |
| 171 | out: |
| 172 | elprintf(EL_32X, "m68k 32x r16 [%06x] %04x @%06x", a, d, SekPc); |
| 173 | return d; |
| 174 | } |
| 175 | |
| 176 | void PicoWrite8_32x(u32 a, u32 d) |
| 177 | { |
| 178 | if ((a & 0xfc00) == 0x5000) |
| 179 | elprintf(EL_32X, "m68k 32x w8 [%06x] %02x @%06x", a, d & 0xff, SekPc); |
| 180 | |
| 181 | if ((a & 0xffc0) == 0x5100) { // a15100 |
| 182 | p32x_reg_write8(a, d); |
| 183 | return; |
| 184 | } |
| 185 | |
| 186 | if (!(Pico32x.regs[0] & 1)) |
| 187 | goto no_vdp; |
| 188 | |
| 189 | if ((a & 0xfff0) == 0x5180) { // a15180 |
| 190 | p32x_vdp_write8(a, d); |
| 191 | return; |
| 192 | } |
| 193 | |
| 194 | // TODO: verify |
| 195 | if ((a & 0xfe00) == 0x5200) { // a15200 |
| 196 | elprintf(EL_32X|EL_ANOMALY, "m68k 32x PAL w8 [%06x] %02x @%06x", a, d & 0xff, SekPc); |
| 197 | ((u8 *)Pico32xMem->pal)[(a & 0x1ff) ^ 1] = d; |
| 198 | Pico32x.dirty_pal = 1; |
| 199 | return; |
| 200 | } |
| 201 | |
| 202 | no_vdp: |
| 203 | elprintf(EL_UIO, "m68k unmapped w8 [%06x] %02x @%06x", a, d & 0xff, SekPc); |
| 204 | } |
| 205 | |
| 206 | void PicoWrite16_32x(u32 a, u32 d) |
| 207 | { |
| 208 | if ((a & 0xfc00) == 0x5000) |
| 209 | elprintf(EL_UIO, "m68k 32x w16 [%06x] %04x @%06x", a, d & 0xffff, SekPc); |
| 210 | |
| 211 | if ((a & 0xffc0) == 0x5100) { // a15100 |
| 212 | p32x_reg_write16(a, d); |
| 213 | return; |
| 214 | } |
| 215 | |
| 216 | if (!(Pico32x.regs[0] & 1)) |
| 217 | goto no_vdp; |
| 218 | |
| 219 | if ((a & 0xfff0) == 0x5180) { // a15180 |
| 220 | p32x_vdp_write16(a, d); |
| 221 | return; |
| 222 | } |
| 223 | |
| 224 | if ((a & 0xfe00) == 0x5200) { // a15200 |
| 225 | Pico32xMem->pal[(a & 0x1ff) / 2] = d; |
| 226 | Pico32x.dirty_pal = 1; |
| 227 | return; |
| 228 | } |
| 229 | |
| 230 | no_vdp: |
| 231 | elprintf(EL_UIO, "m68k unmapped w16 [%06x] %04x @%06x", a, d & 0xffff, SekPc); |
| 232 | } |
| 233 | |
| 234 | // hint vector is writeable |
| 235 | static void PicoWrite8_hint(u32 a, u32 d) |
| 236 | { |
| 237 | if ((a & 0xfffc) == 0x0070) { |
| 238 | Pico32xMem->m68k_rom[a ^ 1] = d; |
| 239 | return; |
| 240 | } |
| 241 | |
| 242 | elprintf(EL_UIO, "m68k unmapped w8 [%06x] %02x @%06x", a, d & 0xff, SekPc); |
| 243 | } |
| 244 | |
| 245 | static void PicoWrite16_hint(u32 a, u32 d) |
| 246 | { |
| 247 | if ((a & 0xfffc) == 0x0070) { |
| 248 | ((u16 *)Pico32xMem->m68k_rom)[a/2] = d; |
| 249 | return; |
| 250 | } |
| 251 | |
| 252 | elprintf(EL_UIO, "m68k unmapped w16 [%06x] %04x @%06x", a, d & 0xffff, SekPc); |
| 253 | } |
| 254 | |
| 255 | void Pico32xSwapDRAM(int b) |
| 256 | { |
| 257 | cpu68k_map_set(m68k_read8_map, 0x840000, 0x85ffff, Pico32xMem->dram[b], 0); |
| 258 | cpu68k_map_set(m68k_read16_map, 0x840000, 0x85ffff, Pico32xMem->dram[b], 0); |
| 259 | cpu68k_map_set(m68k_write8_map, 0x840000, 0x85ffff, Pico32xMem->dram[b], 0); |
| 260 | cpu68k_map_set(m68k_write16_map, 0x840000, 0x85ffff, Pico32xMem->dram[b], 0); |
| 261 | } |
| 262 | |
| 263 | #define HWSWAP(x) (((x) << 16) | ((x) >> 16)) |
| 264 | void PicoMemSetup32x(void) |
| 265 | { |
| 266 | unsigned short *ps; |
| 267 | unsigned int *pl; |
| 268 | unsigned int rs, rs1; |
| 269 | int i; |
| 270 | |
| 271 | Pico32xMem = calloc(1, sizeof(*Pico32xMem)); |
| 272 | if (Pico32xMem == NULL) { |
| 273 | elprintf(EL_STATUS, "OOM"); |
| 274 | return; |
| 275 | } |
| 276 | |
| 277 | // generate 68k ROM |
| 278 | ps = (unsigned short *)Pico32xMem->m68k_rom; |
| 279 | pl = (unsigned int *)Pico32xMem->m68k_rom; |
| 280 | for (i = 1; i < 0xc0/4; i++) |
| 281 | pl[i] = HWSWAP(0x880200 + (i - 1) * 6); |
| 282 | |
| 283 | // fill with nops |
| 284 | for (i = 0xc0/2; i < 0x100/2; i++) |
| 285 | ps[i] = 0x4e71; |
| 286 | |
| 287 | ps[0xc0/2] = 0x46fc; |
| 288 | ps[0xc2/2] = 0x2700; // move #0x2700,sr |
| 289 | ps[0xfe/2] = 0x60fe; // jump to self |
| 290 | |
| 291 | // fill remaining mem with ROM |
| 292 | memcpy(Pico32xMem->m68k_rom + 0x100, Pico.rom + 0x100, sizeof(Pico32xMem->m68k_rom) - 0x100); |
| 293 | |
| 294 | // cartridge area becomes unmapped |
| 295 | // XXX: we take the easy way and don't unmap ROM, |
| 296 | // so that we can avoid handling the RV bit. |
| 297 | // m68k_map_unmap(0x000000, 0x3fffff); |
| 298 | |
| 299 | // MD ROM area |
| 300 | rs = sizeof(Pico32xMem->m68k_rom); |
| 301 | cpu68k_map_set(m68k_read8_map, 0x000000, rs - 1, Pico32xMem->m68k_rom, 0); |
| 302 | cpu68k_map_set(m68k_read16_map, 0x000000, rs - 1, Pico32xMem->m68k_rom, 0); |
| 303 | cpu68k_map_set(m68k_write8_map, 0x000000, rs - 1, PicoWrite8_hint, 1); // TODO verify |
| 304 | cpu68k_map_set(m68k_write16_map, 0x000000, rs - 1, PicoWrite16_hint, 1); |
| 305 | |
| 306 | // DRAM area |
| 307 | Pico32xSwapDRAM(1); |
| 308 | |
| 309 | // 32X ROM (unbanked, XXX: consider mirroring?) |
| 310 | rs1 = rs = (Pico.romsize + M68K_BANK_MASK) & ~M68K_BANK_MASK; |
| 311 | if (rs1 > 0x80000) |
| 312 | rs1 = 0x80000; |
| 313 | cpu68k_map_set(m68k_read8_map, 0x880000, 0x880000 + rs1 - 1, Pico.rom, 0); |
| 314 | cpu68k_map_set(m68k_read16_map, 0x880000, 0x880000 + rs1 - 1, Pico.rom, 0); |
| 315 | |
| 316 | // 32X ROM (banked) |
| 317 | if (rs > 0x100000) |
| 318 | rs = 0x100000; |
| 319 | cpu68k_map_set(m68k_read8_map, 0x900000, 0x900000 + rs - 1, Pico.rom, 0); |
| 320 | cpu68k_map_set(m68k_read16_map, 0x900000, 0x900000 + rs - 1, Pico.rom, 0); |
| 321 | } |
| 322 | |