| 1 | #include "../pico_int.h" |
| 2 | #include "../memory.h" |
| 3 | |
| 4 | static const char str_mars[] = "MARS"; |
| 5 | |
| 6 | struct Pico32xMem { |
| 7 | u8 sdram[0x40000]; |
| 8 | u8 dram[0x40000]; // AKA fb |
| 9 | u8 m68k_rom[M68K_BANK_SIZE]; // 0x100 |
| 10 | }; |
| 11 | |
| 12 | static struct Pico32xMem *Pico32xMem; |
| 13 | |
| 14 | static u32 p32x_reg_read16(u32 a) |
| 15 | { |
| 16 | a &= 0x3e; |
| 17 | |
| 18 | return Pico32x.regs[a / 2]; |
| 19 | } |
| 20 | |
| 21 | static void p32x_reg_write16(u32 a, u32 d) |
| 22 | { |
| 23 | a &= 0x3e; |
| 24 | |
| 25 | if (a == 0 && !(Pico32x.regs[0] & 1)) { |
| 26 | Pico32x.regs[0] |= 1; |
| 27 | Pico32xStartup(); |
| 28 | return; |
| 29 | } |
| 30 | } |
| 31 | |
| 32 | static void p32x_reg_write8(u32 a, u32 d) |
| 33 | { |
| 34 | a &= 0x3f; |
| 35 | |
| 36 | if (a == 1 && !(Pico32x.regs[0] & 1)) { |
| 37 | Pico32x.regs[0] |= 1; |
| 38 | Pico32xStartup(); |
| 39 | return; |
| 40 | } |
| 41 | } |
| 42 | |
| 43 | // VDP regs |
| 44 | static u32 p32x_vdp_read16(u32 a) |
| 45 | { |
| 46 | a &= 0x0e; |
| 47 | |
| 48 | return Pico32x.vdp_regs[a / 2]; |
| 49 | } |
| 50 | |
| 51 | static void p32x_vdp_write16(u32 a, u32 d) |
| 52 | { |
| 53 | a &= 0x0e; |
| 54 | |
| 55 | switch (a) { |
| 56 | case 0x0a: |
| 57 | Pico32x.pending_fb = d & 1; |
| 58 | if (Pico.video.status & 8) { |
| 59 | Pico32x.vdp_regs[0x0a/2] &= ~1; |
| 60 | Pico32x.vdp_regs[0x0a/2] |= d & 1; |
| 61 | } |
| 62 | break; |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | static void p32x_vdp_write8(u32 a, u32 d) |
| 67 | { |
| 68 | a &= 0x0f; |
| 69 | |
| 70 | switch (a) { |
| 71 | case 0x0b: |
| 72 | Pico32x.pending_fb = d & 1; |
| 73 | if (Pico.video.status & 8) { |
| 74 | Pico32x.vdp_regs[0x0a/2] &= ~1; |
| 75 | Pico32x.vdp_regs[0x0a/2] |= d & 1; |
| 76 | } |
| 77 | break; |
| 78 | } |
| 79 | } |
| 80 | |
| 81 | // default 32x handlers |
| 82 | u32 PicoRead8_32x(u32 a) |
| 83 | { |
| 84 | u32 d = 0; |
| 85 | if ((a & 0xffc0) == 0x5100) { // a15100 |
| 86 | d = p32x_reg_read16(a); |
| 87 | goto out_16to8; |
| 88 | } |
| 89 | |
| 90 | if ((a & 0xfff0) == 0x5180 && (Pico32x.regs[0] & 1)) { |
| 91 | d = p32x_vdp_read16(a); |
| 92 | goto out_16to8; |
| 93 | } |
| 94 | |
| 95 | if ((a & 0xfffc) == 0x30ec) { // a130ec |
| 96 | d = str_mars[a & 3]; |
| 97 | goto out; |
| 98 | } |
| 99 | |
| 100 | elprintf(EL_UIO, "m68k unmapped r8 [%06x] @%06x", a, SekPc); |
| 101 | return d; |
| 102 | |
| 103 | out_16to8: |
| 104 | if (a & 1) |
| 105 | d &= 0xff; |
| 106 | else |
| 107 | d >>= 8; |
| 108 | |
| 109 | out: |
| 110 | elprintf(EL_32X, "m68k 32x r8 [%06x] %02x @%06x", a, d, SekPc); |
| 111 | return d; |
| 112 | } |
| 113 | |
| 114 | u32 PicoRead16_32x(u32 a) |
| 115 | { |
| 116 | u32 d = 0; |
| 117 | if ((a & 0xffc0) == 0x5100) { // a15100 |
| 118 | d = p32x_reg_read16(a); |
| 119 | goto out; |
| 120 | } |
| 121 | |
| 122 | if ((a & 0xfff0) == 0x5180 && (Pico32x.regs[0] & 1)) { // a15180 |
| 123 | d = p32x_vdp_read16(a); |
| 124 | goto out; |
| 125 | } |
| 126 | |
| 127 | if ((a & 0xfffc) == 0x30ec) { // a130ec |
| 128 | d = !(a & 2) ? ('M'<<8)|'A' : ('R'<<8)|'S'; |
| 129 | goto out; |
| 130 | } |
| 131 | |
| 132 | elprintf(EL_UIO, "m68k unmapped r16 [%06x] @%06x", a, SekPc); |
| 133 | return d; |
| 134 | |
| 135 | out: |
| 136 | elprintf(EL_32X, "m68k 32x r16 [%06x] %04x @%06x", a, d, SekPc); |
| 137 | return d; |
| 138 | } |
| 139 | |
| 140 | void PicoWrite8_32x(u32 a, u32 d) |
| 141 | { |
| 142 | if ((a & 0xfc00) == 0x5000) |
| 143 | elprintf(EL_32X, "m68k 32x w8 [%06x] %02x @%06x", a, d & 0xff, SekPc); |
| 144 | |
| 145 | if ((a & 0xffc0) == 0x5100) { // a15100 |
| 146 | p32x_reg_write8(a, d); |
| 147 | return; |
| 148 | } |
| 149 | |
| 150 | if ((a & 0xfff0) == 0x5180 && (Pico32x.regs[0] & 1)) { // a15180 |
| 151 | p32x_vdp_write8(a, d); |
| 152 | return; |
| 153 | } |
| 154 | |
| 155 | elprintf(EL_UIO, "m68k unmapped w8 [%06x] %02x @%06x", a, d & 0xff, SekPc); |
| 156 | } |
| 157 | |
| 158 | void PicoWrite16_32x(u32 a, u32 d) |
| 159 | { |
| 160 | if ((a & 0xfc00) == 0x5000) |
| 161 | elprintf(EL_UIO, "m68k 32x w16 [%06x] %04x @%06x", a, d & 0xffff, SekPc); |
| 162 | |
| 163 | if ((a & 0xffc0) == 0x5100) { // a15100 |
| 164 | p32x_reg_write16(a, d); |
| 165 | return; |
| 166 | } |
| 167 | |
| 168 | if ((a & 0xfff0) == 0x5180 && (Pico32x.regs[0] & 1)) { // a15180 |
| 169 | p32x_vdp_write16(a, d); |
| 170 | return; |
| 171 | } |
| 172 | |
| 173 | elprintf(EL_UIO, "m68k unmapped w16 [%06x] %04x @%06x", a, d & 0xffff, SekPc); |
| 174 | } |
| 175 | |
| 176 | // hint vector is writeable |
| 177 | static void PicoWrite8_hint(u32 a, u32 d) |
| 178 | { |
| 179 | if ((a & 0xfffc) == 0x0070) { |
| 180 | Pico32xMem->m68k_rom[a ^ 1] = d; |
| 181 | return; |
| 182 | } |
| 183 | |
| 184 | elprintf(EL_UIO, "m68k unmapped w8 [%06x] %02x @%06x", a, d & 0xff, SekPc); |
| 185 | } |
| 186 | |
| 187 | static void PicoWrite16_hint(u32 a, u32 d) |
| 188 | { |
| 189 | if ((a & 0xfffc) == 0x0070) { |
| 190 | ((u16 *)Pico32xMem->m68k_rom)[a/2] = d; |
| 191 | return; |
| 192 | } |
| 193 | |
| 194 | elprintf(EL_UIO, "m68k unmapped w16 [%06x] %04x @%06x", a, d & 0xffff, SekPc); |
| 195 | } |
| 196 | |
| 197 | #define HWSWAP(x) (((x) << 16) | ((x) >> 16)) |
| 198 | void PicoMemSetup32x(void) |
| 199 | { |
| 200 | unsigned short *ps; |
| 201 | unsigned int *pl; |
| 202 | unsigned int rs, rs1; |
| 203 | int i; |
| 204 | |
| 205 | Pico32xMem = calloc(1, sizeof(*Pico32xMem)); |
| 206 | if (Pico32xMem == NULL) { |
| 207 | elprintf(EL_STATUS, "OOM"); |
| 208 | return; |
| 209 | } |
| 210 | |
| 211 | // generate 68k ROM |
| 212 | ps = (unsigned short *)Pico32xMem->m68k_rom; |
| 213 | pl = (unsigned int *)Pico32xMem->m68k_rom; |
| 214 | for (i = 1; i < 0xc0/4; i++) |
| 215 | pl[i] = HWSWAP(0x880200 + i * 6); |
| 216 | |
| 217 | // fill with nops |
| 218 | for (i = 0xc0/2; i < 0x100/2; i++) |
| 219 | ps[i] = 0x4e71; |
| 220 | |
| 221 | ps[0xc0/2] = 0x46fc; |
| 222 | ps[0xc2/2] = 0x2700; // move #0x2700,sr |
| 223 | ps[0xfe/2] = 0x60fe; // jump to self |
| 224 | |
| 225 | // fill remaining mem with ROM |
| 226 | memcpy(Pico32xMem->m68k_rom + 0x100, Pico.rom + 0x100, M68K_BANK_SIZE - 0x100); |
| 227 | |
| 228 | // cartridge area becomes unmapped |
| 229 | // XXX: we take the easy way and don't unmap ROM, |
| 230 | // so that we can avoid handling the RV bit. |
| 231 | // m68k_map_unmap(0x000000, 0x3fffff); |
| 232 | |
| 233 | // MD ROM area |
| 234 | cpu68k_map_set(m68k_read8_map, 0x000000, M68K_BANK_SIZE - 1, Pico32xMem->m68k_rom, 0); |
| 235 | cpu68k_map_set(m68k_read16_map, 0x000000, M68K_BANK_SIZE - 1, Pico32xMem->m68k_rom, 0); |
| 236 | cpu68k_map_set(m68k_write8_map, 0x000000, M68K_BANK_SIZE - 1, PicoWrite8_hint, 1); // TODO verify |
| 237 | cpu68k_map_set(m68k_write16_map, 0x000000, M68K_BANK_SIZE - 1, PicoWrite16_hint, 1); |
| 238 | |
| 239 | // 32X ROM (unbanked, XXX: consider mirroring?) |
| 240 | rs1 = rs = (Pico.romsize + M68K_BANK_MASK) & ~M68K_BANK_MASK; |
| 241 | if (rs1 > 0x80000) |
| 242 | rs1 = 0x80000; |
| 243 | cpu68k_map_set(m68k_read8_map, 0x880000, 0x880000 + rs1 - 1, Pico.rom, 0); |
| 244 | cpu68k_map_set(m68k_read16_map, 0x880000, 0x880000 + rs1 - 1, Pico.rom, 0); |
| 245 | |
| 246 | // 32X ROM (banked) |
| 247 | if (rs > 0x100000) |
| 248 | rs = 0x100000; |
| 249 | cpu68k_map_set(m68k_read8_map, 0x900000, 0x900000 + rs - 1, Pico.rom, 0); |
| 250 | cpu68k_map_set(m68k_read16_map, 0x900000, 0x900000 + rs - 1, Pico.rom, 0); |
| 251 | } |
| 252 | |