| 1 | @ vim:filetype=armasm |
| 2 | |
| 3 | @ Memory i/o handlers for Sega/Mega CD emulation |
| 4 | @ (c) Copyright 2007, Grazvydas "notaz" Ignotas |
| 5 | @ All Rights Reserved |
| 6 | |
| 7 | |
| 8 | |
| 9 | .equiv PCM_STEP_SHIFT, 11 |
| 10 | |
| 11 | @ jump tables |
| 12 | .data |
| 13 | .align 4 |
| 14 | |
| 15 | .altmacro |
| 16 | .macro mk_m68k_jump_table on sz @ operation name, size |
| 17 | .long m_m68k_&\on&\sz&_bios @ 0x000000 - 0x01ffff |
| 18 | .long m_m68k_&\on&\sz&_prgbank @ 0x020000 - 0x03ffff |
| 19 | .long m_&\on&_null, m_&\on&_null @ 0x040000 - 0x07ffff |
| 20 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x080000 - 0x0fffff |
| 21 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x100000 - 0x17ffff |
| 22 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x180000 - 0x1fffff |
| 23 | .long m_m68k_&\on&\sz&_wordram0_2M @ 0x200000 - 0x21ffff |
| 24 | .long m_m68k_&\on&\sz&_wordram1_2M @ 0x220000 - 0x23ffff |
| 25 | .long m_&\on&_null, m_&\on&_null @ 0x240000 - 0x27ffff |
| 26 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x280000 - 0x2fffff |
| 27 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x300000 |
| 28 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ - 0x3fffff |
| 29 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x400000 |
| 30 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ - 0x4fffff |
| 31 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x500000 |
| 32 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ - 0x5fffff |
| 33 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x600000 |
| 34 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ - 0x6fffff |
| 35 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x700000 |
| 36 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ - 0x7fffff |
| 37 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x800000 |
| 38 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ - 0x8fffff |
| 39 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x900000 |
| 40 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ - 0x9fffff |
| 41 | .long m_m68k_&\on&\sz&_system_io @ 0xa00000 - 0xa1ffff |
| 42 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0xa20000 - 0xa7ffff |
| 43 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0xa80000 - 0xafffff |
| 44 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0xb00000 |
| 45 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ - 0xbfffff |
| 46 | .long m_m68k_&\on&\sz&_vdp, m_m68k_&\on&\sz&_vdp, m_m68k_&\on&\sz&_vdp, m_m68k_&\on&\sz&_vdp @ 0xc00000 |
| 47 | .long m_m68k_&\on&\sz&_vdp, m_m68k_&\on&\sz&_vdp, m_m68k_&\on&\sz&_vdp, m_m68k_&\on&\sz&_vdp @ - 0xcfffff |
| 48 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0xd00000 |
| 49 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ - 0xdfffff |
| 50 | .long m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram @ 0xe00000 |
| 51 | .long m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram @ - 0xefffff |
| 52 | .long m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram @ 0xf00000 |
| 53 | .long m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram @ - 0xffffff |
| 54 | .endm |
| 55 | |
| 56 | .macro mk_s68k_jump_table on sz @ operation name, size |
| 57 | .long m_s68k_&\on&\sz&_prg, m_s68k_&\on&\sz&_prg, m_s68k_&\on&\sz&_prg, m_s68k_&\on&\sz&_prg @ 0x000000 - 0x07ffff |
| 58 | .long m_s68k_&\on&\sz&_wordram_2M @ 0x080000 - 0x09ffff |
| 59 | .long m_s68k_&\on&\sz&_wordram_2M @ 0x0a0000 - 0x0bffff |
| 60 | .long m_&\on&_null @ 0x0c0000 - 0x0dffff, 1M area |
| 61 | .long m_&\on&_null @ 0x0e0000 - 0x0fffff |
| 62 | .endm |
| 63 | |
| 64 | |
| 65 | @ the jumptables themselves |
| 66 | m_m68k_read8_table: mk_m68k_jump_table read 8 |
| 67 | m_m68k_read16_table: mk_m68k_jump_table read 16 |
| 68 | m_m68k_read32_table: mk_m68k_jump_table read 32 |
| 69 | m_m68k_write8_table: mk_m68k_jump_table write 8 |
| 70 | m_m68k_write16_table: mk_m68k_jump_table write 16 |
| 71 | m_m68k_write32_table: mk_m68k_jump_table write 32 |
| 72 | |
| 73 | m_s68k_read8_table: mk_s68k_jump_table read 8 |
| 74 | m_s68k_read16_table: mk_s68k_jump_table read 16 |
| 75 | m_s68k_read32_table: mk_s68k_jump_table read 32 |
| 76 | m_s68k_write8_table: mk_s68k_jump_table write 8 |
| 77 | m_s68k_write16_table: mk_s68k_jump_table write 16 |
| 78 | m_s68k_write32_table: mk_s68k_jump_table write 32 |
| 79 | |
| 80 | |
| 81 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 82 | |
| 83 | .text |
| 84 | .align 4 |
| 85 | |
| 86 | .global PicoMemResetCD |
| 87 | .global PicoReadM68k8 |
| 88 | .global PicoReadM68k16 |
| 89 | .global PicoReadM68k32 |
| 90 | .global PicoWriteM68k8 |
| 91 | .global PicoWriteM68k16 |
| 92 | .global PicoWriteM68k32 |
| 93 | .global PicoReadS68k8 |
| 94 | .global PicoReadS68k16 |
| 95 | .global PicoReadS68k32 |
| 96 | .global PicoWriteS68k8 |
| 97 | .global PicoWriteS68k16 |
| 98 | .global PicoWriteS68k32 |
| 99 | |
| 100 | @ externs, just for reference |
| 101 | .extern Pico |
| 102 | .extern z80Read8 |
| 103 | .extern OtherRead16 |
| 104 | .extern PicoVideoRead |
| 105 | .extern Read_CDC_Host |
| 106 | .extern m68k_reg_write8 |
| 107 | .extern OtherWrite8 |
| 108 | .extern OtherWrite16 |
| 109 | .extern gfx_cd_read |
| 110 | .extern s68k_reg_read16 |
| 111 | .extern SRam |
| 112 | .extern gfx_cd_write16 |
| 113 | .extern s68k_reg_write8 |
| 114 | |
| 115 | |
| 116 | @ r0=reg3, r1-r3=temp |
| 117 | .macro mk_update_table on sz @ operation name, size |
| 118 | @ we only set word-ram handlers |
| 119 | ldr r1, =m_m68k_&\on&\sz&_table |
| 120 | ldr r12,=m_s68k_&\on&\sz&_table |
| 121 | tst r0, #4 |
| 122 | bne 0f @ pmr_8_1M |
| 123 | |
| 124 | @ pmr_8_2M: |
| 125 | ldr r2, =m_m68k_&\on&\sz&_wordram0_2M |
| 126 | ldr r3, =m_s68k_&\on&\sz&_wordram_2M |
| 127 | str r2, [r1, #16*4] |
| 128 | str r2, [r1, #17*4] |
| 129 | ldr r2, =m_&\on&_null |
| 130 | str r3, [r12,#4*4] |
| 131 | str r3, [r12,#5*4] |
| 132 | str r2, [r12,#6*4] |
| 133 | b 9f @ pmr_8_done |
| 134 | |
| 135 | 0: @ pmr_8_1M: |
| 136 | tst r0, #1 |
| 137 | bne 1f @ pmr_8_1M1 |
| 138 | |
| 139 | @ pmr_8_1M0: |
| 140 | ldr r2, =m_m68k_&\on&\sz&_wordram0_1M_b0 |
| 141 | ldr r3, =m_m68k_&\on&\sz&_wordram1_1M_b0 |
| 142 | str r2, [r1, #16*4] |
| 143 | str r3, [r1, #17*4] |
| 144 | ldr r2, =m_s68k_&\on&\sz&_wordram_2M_decode_b1 |
| 145 | ldr r3, =m_s68k_&\on&\sz&_wordram_1M_b1 |
| 146 | str r2, [r12,#4*4] |
| 147 | str r2, [r12,#5*4] |
| 148 | str r3, [r12,#6*4] |
| 149 | b 9f @ pmr_8_done |
| 150 | |
| 151 | 1: @ pmr_8_1M1: |
| 152 | ldr r2, =m_m68k_&\on&\sz&_wordram0_1M_b1 |
| 153 | ldr r3, =m_m68k_&\on&\sz&_wordram1_1M_b1 |
| 154 | str r2, [r1, #16*4] |
| 155 | str r3, [r1, #17*4] |
| 156 | ldr r2, =m_s68k_&\on&\sz&_wordram_2M_decode_b0 |
| 157 | ldr r3, =m_s68k_&\on&\sz&_wordram_1M_b0 |
| 158 | str r2, [r12,#4*4] |
| 159 | str r2, [r12,#5*4] |
| 160 | str r3, [r12,#6*4] |
| 161 | |
| 162 | 9: @ pmr_8_done: |
| 163 | .endm |
| 164 | |
| 165 | |
| 166 | PicoMemResetCD: @ r3 |
| 167 | mk_update_table read 8 |
| 168 | mk_update_table read 16 |
| 169 | mk_update_table read 32 |
| 170 | mk_update_table write 8 |
| 171 | mk_update_table write 16 |
| 172 | mk_update_table write 32 |
| 173 | bx lr |
| 174 | |
| 175 | |
| 176 | .pool |
| 177 | |
| 178 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 179 | |
| 180 | .macro mk_entry_m68k table |
| 181 | ldr r2, =\table |
| 182 | bic r0, r0, #0xff000000 |
| 183 | and r3, r0, #0x00fe0000 |
| 184 | ldr pc, [r2, r3, lsr #15] |
| 185 | .endm |
| 186 | |
| 187 | PicoReadM68k8: @ u32 a |
| 188 | mk_entry_m68k m_m68k_read8_table |
| 189 | |
| 190 | PicoReadM68k16: @ u32 a |
| 191 | mk_entry_m68k m_m68k_read16_table |
| 192 | |
| 193 | PicoReadM68k32: @ u32 a |
| 194 | mk_entry_m68k m_m68k_read32_table |
| 195 | |
| 196 | PicoWriteM68k8: @ u32 a, u8 d |
| 197 | mk_entry_m68k m_m68k_write8_table |
| 198 | |
| 199 | PicoWriteM68k16: @ u32 a, u16 d |
| 200 | mk_entry_m68k m_m68k_write16_table |
| 201 | |
| 202 | PicoWriteM68k32: @ u32 a, u32 d |
| 203 | mk_entry_m68k m_m68k_write32_table |
| 204 | |
| 205 | |
| 206 | .macro mk_entry_s68k on sz |
| 207 | bic r0, r0, #0xff000000 |
| 208 | cmp r0, #0x00080000 |
| 209 | blt m_s68k_&\on&\sz&_prg |
| 210 | cmp r0, #0x000e0000 |
| 211 | ldrlt r2, =m_s68k_&\on&\sz&_table |
| 212 | andlt r3, r0, #0x000e0000 |
| 213 | ldrlt pc, [r2, r3, lsr #15] |
| 214 | mov r3, #0x00ff0000 |
| 215 | orr r3, r3, #0x00008000 |
| 216 | cmp r0, r3 |
| 217 | bge m_s68k_&\on&\sz&_regs |
| 218 | cmp r0, #0x00ff0000 |
| 219 | bge m_s68k_&\on&\sz&_pcm |
| 220 | cmp r0, #0x00fe0000 |
| 221 | bge m_s68k_&\on&\sz&_backup |
| 222 | mov r0, #0 |
| 223 | bx lr |
| 224 | .endm |
| 225 | |
| 226 | PicoReadS68k8: @ u32 a |
| 227 | mk_entry_s68k read 8 |
| 228 | |
| 229 | PicoReadS68k16: @ u32 a |
| 230 | mk_entry_s68k read 16 |
| 231 | |
| 232 | PicoReadS68k32: @ u32 a |
| 233 | mk_entry_s68k read 32 |
| 234 | |
| 235 | PicoWriteS68k8: @ u32 a, u8 d |
| 236 | mk_entry_s68k write 8 |
| 237 | |
| 238 | PicoWriteS68k16: @ u32 a, u16 d |
| 239 | mk_entry_s68k write 16 |
| 240 | |
| 241 | PicoWriteS68k32: @ u32 a, u32 d |
| 242 | mk_entry_s68k write 32 |
| 243 | |
| 244 | |
| 245 | .pool |
| 246 | |
| 247 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 248 | |
| 249 | @ utilities |
| 250 | |
| 251 | @ r0=addr[in,out], r1,r2=tmp |
| 252 | .macro cell_map |
| 253 | ands r1, r0, #0x01c000 |
| 254 | ldrne pc, [pc, r1, lsr #12] |
| 255 | beq 0f @ most common? |
| 256 | .long 0f |
| 257 | .long 0f |
| 258 | .long 0f |
| 259 | .long 0f |
| 260 | .long 1f |
| 261 | .long 1f |
| 262 | .long 2f |
| 263 | .long 3f |
| 264 | 1: @ x16 cells |
| 265 | and r1, r0, #0x7e00 @ col |
| 266 | and r2, r0, #0x01fc @ row |
| 267 | orr r2, r2, #0x0400 |
| 268 | orr r1, r2, r1, ror #13 |
| 269 | b 9f |
| 270 | 2: @ x8 cells |
| 271 | and r1, r0, #0x3f00 @ col |
| 272 | and r2, r0, #0x00fc @ row |
| 273 | orr r2, r2, #0x0600 |
| 274 | orr r1, r2, r1, ror #12 |
| 275 | b 9f |
| 276 | 3: @ x4 cells |
| 277 | and r1, r0, #0x1f80 @ col |
| 278 | and r2, r0, #0x007c @ row |
| 279 | orr r1, r2, r1, ror #11 |
| 280 | and r2, r0,#0x1e000 |
| 281 | orr r1, r1, r2, lsr #6 |
| 282 | b 9f |
| 283 | 0: @ x32 cells |
| 284 | and r1, r0, #0xfc00 @ col |
| 285 | and r2, r0, #0x03fc @ row |
| 286 | orr r1, r2, r1, ror #14 |
| 287 | 9: |
| 288 | and r0, r0, #3 |
| 289 | orr r0, r0, r1, ror #26 @ rol 4+2 |
| 290 | .endm |
| 291 | |
| 292 | |
| 293 | @ r0=prt1, r1=ptr2 |
| 294 | .macro m_read32_gen |
| 295 | tst r0, #2 |
| 296 | ldrneh r0, [r1, r0]! |
| 297 | ldrneh r1, [r1, #2] |
| 298 | ldreq r0, [r1, r0] |
| 299 | moveq r0, r0, ror #16 |
| 300 | orrne r0, r1, r0, lsl #16 |
| 301 | .endm |
| 302 | |
| 303 | |
| 304 | @ r0=prt1, r1=data, r2=ptr2 |
| 305 | .macro m_write32_gen |
| 306 | tst r0, #2 |
| 307 | mov r1, r1, ror #16 |
| 308 | strneh r1, [r2, r0]! |
| 309 | movne r1, r1, lsr #16 |
| 310 | strneh r1, [r2, #2] |
| 311 | streq r1, [r2, r0] |
| 312 | .endm |
| 313 | |
| 314 | |
| 315 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 316 | |
| 317 | |
| 318 | m_read_null: |
| 319 | mov r0, #0 |
| 320 | bx lr |
| 321 | |
| 322 | |
| 323 | m_m68k_read8_bios: |
| 324 | ldr r1, =(Pico+0x22200) |
| 325 | bic r0, r0, #0xfe0000 |
| 326 | ldr r1, [r1] |
| 327 | eor r0, r0, #1 |
| 328 | ldrb r0, [r1, r0] |
| 329 | bx lr |
| 330 | |
| 331 | |
| 332 | m_m68k_read8_prgbank: |
| 333 | ldr r1, =(Pico+0x22200) |
| 334 | eor r0, r0, #1 |
| 335 | ldr r1, [r1] |
| 336 | mov r2, #0x110000 |
| 337 | orr r3, r2, #0x002200 |
| 338 | ldr r3, [r1, r3] |
| 339 | ldr r2, [r1, r2] |
| 340 | tst r3, #0x00020000 @ have bus? |
| 341 | moveq r0, #0 |
| 342 | bxeq lr |
| 343 | and r2, r2, #0xc0000000 @ r3 & 0xC0 |
| 344 | add r1, r1, r2, lsr #12 |
| 345 | ldrb r0, [r1, r0] |
| 346 | bx lr |
| 347 | |
| 348 | |
| 349 | m_m68k_read8_wordram0_2M: @ 0x200000 - 0x21ffff |
| 350 | m_m68k_read8_wordram1_2M: @ 0x220000 - 0x23ffff |
| 351 | ldr r1, =(Pico+0x22200) |
| 352 | sub r0, r0, #0x160000 @ map to our offset, which is 0x0a0000 |
| 353 | ldr r1, [r1] |
| 354 | eor r0, r0, #1 |
| 355 | ldrb r0, [r1, r0] |
| 356 | bx lr |
| 357 | |
| 358 | |
| 359 | m_m68k_read8_wordram0_1M_b0: @ 0x200000 - 0x21ffff |
| 360 | ldr r1, =(Pico+0x22200) |
| 361 | sub r0, r0, #0x140000 @ map to our offset, which is 0x0c0000 |
| 362 | ldr r1, [r1] |
| 363 | eor r0, r0, #1 |
| 364 | ldrb r0, [r1, r0] |
| 365 | bx lr |
| 366 | |
| 367 | |
| 368 | m_m68k_read8_wordram0_1M_b1: @ 0x200000 - 0x21ffff |
| 369 | ldr r1, =(Pico+0x22200) |
| 370 | sub r0, r0, #0x120000 @ map to our offset, which is 0x0e0000 |
| 371 | ldr r1, [r1] |
| 372 | eor r0, r0, #1 |
| 373 | ldrb r0, [r1, r0] |
| 374 | bx lr |
| 375 | |
| 376 | |
| 377 | m_m68k_read8_wordram1_1M_b0: @ 0x220000 - 0x23ffff, cell arranged |
| 378 | cell_map |
| 379 | ldr r1, =(Pico+0x22200) |
| 380 | add r0, r0, #0x0c0000 |
| 381 | ldr r1, [r1] |
| 382 | eor r0, r0, #1 |
| 383 | ldrb r0, [r1, r0] |
| 384 | bx lr |
| 385 | |
| 386 | |
| 387 | m_m68k_read8_wordram1_1M_b1: @ 0x220000 - 0x23ffff, cell arranged |
| 388 | cell_map |
| 389 | ldr r1, =(Pico+0x22200) |
| 390 | add r0, r0, #0x0e0000 |
| 391 | ldr r1, [r1] |
| 392 | eor r0, r0, #1 |
| 393 | ldrb r0, [r1, r0] |
| 394 | bx lr |
| 395 | |
| 396 | |
| 397 | m_m68k_read8_system_io: |
| 398 | bic r2, r0, #0xfe0000 |
| 399 | bic r2, r2, #0x3f |
| 400 | cmp r2, #0x012000 |
| 401 | bne m_m68k_read8_misc |
| 402 | |
| 403 | ldr r1, =(Pico+0x22200) |
| 404 | and r0, r0, #0x3f |
| 405 | ldr r1, [r1] @ Pico.mcd (used everywhere) |
| 406 | cmp r0, #0x0e |
| 407 | ldrlt pc, [pc, r0, lsl #2] |
| 408 | b m_m68k_read8_hi |
| 409 | .long m_m68k_read8_r00 |
| 410 | .long m_m68k_read8_r01 |
| 411 | .long m_m68k_read8_r02 |
| 412 | .long m_m68k_read8_r03 |
| 413 | .long m_m68k_read8_r04 |
| 414 | .long m_read_null @ unused bits |
| 415 | .long m_m68k_read8_r06 |
| 416 | .long m_m68k_read8_r07 |
| 417 | .long m_m68k_read8_r08 |
| 418 | .long m_m68k_read8_r09 |
| 419 | .long m_read_null @ reserved |
| 420 | .long m_read_null |
| 421 | .long m_m68k_read8_r0c |
| 422 | .long m_m68k_read8_r0d |
| 423 | m_m68k_read8_r00: |
| 424 | add r1, r1, #0x110000 |
| 425 | ldr r0, [r1, #30] |
| 426 | and r0, r0, #0x04000000 @ we need irq2 mask state |
| 427 | mov r0, r0, lsr #19 |
| 428 | bx lr |
| 429 | m_m68k_read8_r01: |
| 430 | add r1, r1, #0x110000 |
| 431 | add r1, r1, #0x002200 |
| 432 | ldrb r0, [r1, #2] @ Pico_mcd->m.busreq |
| 433 | bx lr |
| 434 | m_m68k_read8_r02: |
| 435 | add r1, r1, #0x110000 |
| 436 | ldrb r0, [r1, #2] |
| 437 | bx lr |
| 438 | m_m68k_read8_r03: |
| 439 | add r1, r1, #0x110000 |
| 440 | ldrb r0, [r1, #3] |
| 441 | and r0, r0, #0xc7 |
| 442 | bx lr |
| 443 | m_m68k_read8_r04: |
| 444 | add r1, r1, #0x110000 |
| 445 | ldrb r0, [r1, #4] |
| 446 | bx lr |
| 447 | m_m68k_read8_r06: |
| 448 | ldrb r0, [r1, #0x73] @ IRQ vector |
| 449 | bx lr |
| 450 | m_m68k_read8_r07: |
| 451 | ldrb r0, [r1, #0x72] |
| 452 | bx lr |
| 453 | m_m68k_read8_r08: |
| 454 | mov r0, #0 |
| 455 | bl Read_CDC_Host @ TODO: make it local |
| 456 | mov r0, r0, lsr #8 |
| 457 | bx lr |
| 458 | m_m68k_read8_r09: |
| 459 | mov r0, #0 |
| 460 | b Read_CDC_Host |
| 461 | m_m68k_read8_r0c: |
| 462 | add r1, r1, #0x110000 |
| 463 | add r1, r1, #0x002200 |
| 464 | ldr r0, [r1, #0x14] @ Pico_mcd->m.timer_stopwatch |
| 465 | mov r0, r0, lsr #24 |
| 466 | bx lr |
| 467 | m_m68k_read8_r0d: |
| 468 | add r1, r1, #0x110000 |
| 469 | add r1, r1, #0x002200 |
| 470 | ldr r0, [r1, #0x14] |
| 471 | mov r0, r0, lsr #16 |
| 472 | bx lr |
| 473 | m_m68k_read8_hi: |
| 474 | cmp r0, #0x30 |
| 475 | movge r0, #0 |
| 476 | bxeq lr |
| 477 | add r1, r1, #0x110000 |
| 478 | ldrb r0, [r1, r0] |
| 479 | bx lr |
| 480 | |
| 481 | |
| 482 | m_m68k_read8_misc: |
| 483 | bic r2, r0, #0x00ff |
| 484 | bic r2, r2, #0xbf00 |
| 485 | cmp r2, #0xa00000 @ Z80 RAM? |
| 486 | beq z80Read8 |
| 487 | @ ldreq r2, =z80Read8 |
| 488 | @ bxeq r2 |
| 489 | stmfd sp!,{r0,lr} |
| 490 | bic r0, r0, #1 |
| 491 | mov r1, #8 |
| 492 | bl OtherRead16 @ non-MCD version should be ok too |
| 493 | ldmfd sp!,{r1,lr} |
| 494 | tst r1, #1 |
| 495 | moveq r0, r0, lsr #8 |
| 496 | bx lr |
| 497 | |
| 498 | |
| 499 | m_m68k_read8_vdp: |
| 500 | tst r0, #0x70000 |
| 501 | tsteq r0, #0x000e0 |
| 502 | bxne lr @ invalid read |
| 503 | stmfd sp!,{r0,lr} |
| 504 | bic r0, r0, #1 |
| 505 | bl PicoVideoRead @ TODO: implement it in asm |
| 506 | ldmfd sp!,{r1,lr} |
| 507 | tst r1, #1 |
| 508 | moveq r0, r0, lsr #8 |
| 509 | bx lr |
| 510 | |
| 511 | |
| 512 | m_m68k_read8_ram: |
| 513 | ldr r1, =Pico |
| 514 | bic r0, r0, #0xff0000 |
| 515 | eor r0, r0, #1 |
| 516 | ldrb r0, [r1, r0] |
| 517 | bx lr |
| 518 | |
| 519 | |
| 520 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 521 | |
| 522 | |
| 523 | m_m68k_read16_bios: |
| 524 | ldr r1, =(Pico+0x22200) |
| 525 | bic r0, r0, #0xfe0000 |
| 526 | ldr r1, [r1] |
| 527 | bic r0, r0, #1 |
| 528 | ldrh r0, [r1, r0] |
| 529 | bx lr |
| 530 | |
| 531 | |
| 532 | m_m68k_read16_prgbank: |
| 533 | ldr r1, =(Pico+0x22200) |
| 534 | bic r0, r0, #1 |
| 535 | ldr r1, [r1] |
| 536 | mov r2, #0x110000 |
| 537 | orr r3, r2, #0x002200 |
| 538 | ldr r3, [r1, r3] |
| 539 | ldr r2, [r1, r2] |
| 540 | tst r3, #0x00020000 @ have bus? |
| 541 | moveq r0, #0 |
| 542 | bxeq lr |
| 543 | and r2, r2, #0xc0000000 @ r3 & 0xC0 |
| 544 | add r1, r1, r2, lsr #12 |
| 545 | ldrh r0, [r1, r0] |
| 546 | bx lr |
| 547 | |
| 548 | |
| 549 | m_m68k_read16_wordram0_2M: @ 0x200000 - 0x21ffff |
| 550 | m_m68k_read16_wordram1_2M: @ 0x220000 - 0x23ffff |
| 551 | ldr r1, =(Pico+0x22200) |
| 552 | sub r0, r0, #0x160000 @ map to our offset, which is 0x0a0000 |
| 553 | ldr r1, [r1] |
| 554 | bic r0, r0, #1 |
| 555 | ldrh r0, [r1, r0] |
| 556 | bx lr |
| 557 | |
| 558 | |
| 559 | m_m68k_read16_wordram0_1M_b0: @ 0x200000 - 0x21ffff |
| 560 | ldr r1, =(Pico+0x22200) |
| 561 | sub r0, r0, #0x140000 @ map to our offset, which is 0x0c0000 |
| 562 | ldr r1, [r1] |
| 563 | bic r0, r0, #1 |
| 564 | ldrh r0, [r1, r0] |
| 565 | bx lr |
| 566 | |
| 567 | |
| 568 | m_m68k_read16_wordram0_1M_b1: @ 0x200000 - 0x21ffff |
| 569 | ldr r1, =(Pico+0x22200) |
| 570 | sub r0, r0, #0x120000 @ map to our offset, which is 0x0e0000 |
| 571 | ldr r1, [r1] |
| 572 | bic r0, r0, #1 |
| 573 | ldrh r0, [r1, r0] |
| 574 | bx lr |
| 575 | |
| 576 | |
| 577 | m_m68k_read16_wordram1_1M_b0: @ 0x220000 - 0x23ffff, cell arranged |
| 578 | @ Warning: read32 relies on NOT using r3 and r12 here |
| 579 | cell_map |
| 580 | ldr r1, =(Pico+0x22200) |
| 581 | add r0, r0, #0x0c0000 |
| 582 | ldr r1, [r1] |
| 583 | bic r0, r0, #1 |
| 584 | ldrh r0, [r1, r0] |
| 585 | bx lr |
| 586 | |
| 587 | |
| 588 | m_m68k_read16_wordram1_1M_b1: @ 0x220000 - 0x23ffff, cell arranged |
| 589 | cell_map |
| 590 | ldr r1, =(Pico+0x22200) |
| 591 | add r0, r0, #0x0e0000 |
| 592 | ldr r1, [r1] |
| 593 | bic r0, r0, #1 |
| 594 | ldrh r0, [r1, r0] |
| 595 | bx lr |
| 596 | |
| 597 | |
| 598 | m_m68k_read16_system_io: |
| 599 | bic r1, r0, #0xfe0000 |
| 600 | bic r1, r1, #0x3f |
| 601 | cmp r1, #0x012000 |
| 602 | bne m_m68k_read16_misc |
| 603 | |
| 604 | m_m68k_read16_m68k_regs: |
| 605 | ldr r1, =(Pico+0x22200) |
| 606 | and r0, r0, #0x3e |
| 607 | ldr r1, [r1] @ Pico.mcd (used everywhere) |
| 608 | cmp r0, #0x0e |
| 609 | ldrlt pc, [pc, r0, lsl #1] |
| 610 | b m_m68k_read16_hi |
| 611 | .long m_m68k_read16_r00 |
| 612 | .long m_m68k_read16_r02 |
| 613 | .long m_m68k_read16_r04 |
| 614 | .long m_m68k_read16_r06 |
| 615 | .long m_m68k_read16_r08 |
| 616 | .long m_read_null @ reserved |
| 617 | .long m_m68k_read16_r0c |
| 618 | m_m68k_read16_r00: |
| 619 | add r1, r1, #0x110000 |
| 620 | ldr r0, [r1, #30] |
| 621 | add r1, r1, #0x002200 |
| 622 | ldrb r1, [r1, #2] @ Pico_mcd->m.busreq |
| 623 | and r0, r0, #0x04000000 @ we need irq2 mask state |
| 624 | orr r0, r1, r0, lsr #11 |
| 625 | bx lr |
| 626 | m_m68k_read16_r02: |
| 627 | add r1, r1, #0x110000 |
| 628 | ldrb r0, [r1, #2] |
| 629 | ldrb r1, [r1, #3] |
| 630 | and r1, r1, #0xc7 |
| 631 | orr r0, r1, r0, lsl #8 |
| 632 | bx lr |
| 633 | m_m68k_read16_r04: |
| 634 | add r1, r1, #0x110000 |
| 635 | ldrb r0, [r1, #4] |
| 636 | mov r0, r0, lsl #8 |
| 637 | bx lr |
| 638 | m_m68k_read16_r06: |
| 639 | ldrh r0, [r1, #0x72] @ IRQ vector |
| 640 | bx lr |
| 641 | m_m68k_read16_r08: |
| 642 | mov r0, #0 |
| 643 | b Read_CDC_Host |
| 644 | m_m68k_read16_r0c: |
| 645 | add r1, r1, #0x110000 |
| 646 | add r1, r1, #0x002200 |
| 647 | ldr r0, [r1, #0x14] |
| 648 | mov r0, r0, lsr #16 |
| 649 | bx lr |
| 650 | m_m68k_read16_hi: |
| 651 | cmp r0, #0x30 |
| 652 | addlt r1, r1, #0x110000 |
| 653 | ldrlth r1, [r1, r0] |
| 654 | movge r0, #0 |
| 655 | bxge lr |
| 656 | mov r0, r1, lsr #8 |
| 657 | and r1, r1, #0xff |
| 658 | orr r0, r0, r1, lsl #8 |
| 659 | bx lr |
| 660 | |
| 661 | |
| 662 | m_m68k_read16_misc: |
| 663 | bic r0, r0, #1 |
| 664 | mov r1, #16 |
| 665 | b OtherRead16 |
| 666 | |
| 667 | |
| 668 | m_m68k_read16_vdp: |
| 669 | tst r0, #0x70000 |
| 670 | tsteq r0, #0x000e0 |
| 671 | bxne lr @ invalid read |
| 672 | bic r0, r0, #1 |
| 673 | b PicoVideoRead |
| 674 | |
| 675 | |
| 676 | m_m68k_read16_ram: |
| 677 | ldr r1, =Pico |
| 678 | bic r0, r0, #0xff0000 |
| 679 | bic r0, r0, #1 |
| 680 | ldrh r0, [r1, r0] |
| 681 | bx lr |
| 682 | |
| 683 | |
| 684 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 685 | |
| 686 | |
| 687 | m_m68k_read32_bios: |
| 688 | ldr r1, =(Pico+0x22200) |
| 689 | bic r0, r0, #0xfe0000 |
| 690 | ldr r1, [r1] |
| 691 | bic r0, r0, #1 |
| 692 | m_read32_gen |
| 693 | bx lr |
| 694 | |
| 695 | |
| 696 | m_m68k_read32_prgbank: |
| 697 | ldr r1, =(Pico+0x22200) |
| 698 | bic r0, r0, #1 |
| 699 | ldr r1, [r1] |
| 700 | mov r2, #0x110000 |
| 701 | orr r3, r2, #0x002200 |
| 702 | ldr r3, [r1, r3] |
| 703 | ldr r2, [r1, r2] |
| 704 | tst r3, #0x00020000 @ have bus? |
| 705 | moveq r0, #0 |
| 706 | bxeq lr |
| 707 | and r2, r2, #0xc0000000 @ r3 & 0xC0 |
| 708 | add r1, r1, r2, lsr #12 |
| 709 | m_read32_gen |
| 710 | bx lr |
| 711 | |
| 712 | |
| 713 | m_m68k_read32_wordram0_2M: @ 0x200000 - 0x21ffff |
| 714 | m_m68k_read32_wordram1_2M: @ 0x220000 - 0x23ffff |
| 715 | ldr r1, =(Pico+0x22200) |
| 716 | sub r0, r0, #0x160000 @ map to our offset, which is 0x0a0000 |
| 717 | ldr r1, [r1] |
| 718 | bic r0, r0, #1 |
| 719 | m_read32_gen |
| 720 | bx lr |
| 721 | |
| 722 | |
| 723 | m_m68k_read32_wordram0_1M_b0: @ 0x200000 - 0x21ffff |
| 724 | ldr r1, =(Pico+0x22200) |
| 725 | sub r0, r0, #0x140000 @ map to our offset, which is 0x0c0000 |
| 726 | ldr r1, [r1] |
| 727 | bic r0, r0, #1 |
| 728 | m_read32_gen |
| 729 | bx lr |
| 730 | |
| 731 | |
| 732 | m_m68k_read32_wordram0_1M_b1: @ 0x200000 - 0x21ffff |
| 733 | ldr r1, =(Pico+0x22200) |
| 734 | sub r0, r0, #0x120000 @ map to our offset, which is 0x0e0000 |
| 735 | ldr r1, [r1] |
| 736 | bic r0, r0, #1 |
| 737 | m_read32_gen |
| 738 | bx lr |
| 739 | |
| 740 | |
| 741 | m_m68k_read32_wordram1_1M_b0: @ 0x220000 - 0x23ffff, cell arranged |
| 742 | tst r0, #2 |
| 743 | bne m_m68k_read32_wordram1_1M_b0_unal |
| 744 | cell_map |
| 745 | ldr r1, =(Pico+0x22200) |
| 746 | add r0, r0, #0x0c0000 |
| 747 | ldr r1, [r1] |
| 748 | bic r0, r0, #1 |
| 749 | m_read32_gen |
| 750 | bx lr |
| 751 | m_m68k_read32_wordram1_1M_b0_unal: |
| 752 | @ hopefully this doesn't happen too often |
| 753 | mov r12,lr |
| 754 | mov r3, r0 |
| 755 | bl m_m68k_read16_wordram1_1M_b0 @ must not trash r12 and r3 |
| 756 | add r1, r3, #2 |
| 757 | mov r3, r0 |
| 758 | mov r0, r1 |
| 759 | bl m_m68k_read16_wordram1_1M_b0 |
| 760 | orr r0, r0, r3, lsl #16 |
| 761 | bx r12 |
| 762 | |
| 763 | |
| 764 | m_m68k_read32_wordram1_1M_b1: @ 0x220000 - 0x23ffff, cell arranged |
| 765 | tst r0, #2 |
| 766 | bne m_m68k_read32_wordram1_1M_b1_unal |
| 767 | cell_map |
| 768 | ldr r1, =(Pico+0x22200) |
| 769 | add r0, r0, #0x0e0000 |
| 770 | ldr r1, [r1] |
| 771 | bic r0, r0, #1 |
| 772 | m_read32_gen |
| 773 | bx lr |
| 774 | m_m68k_read32_wordram1_1M_b1_unal: |
| 775 | mov r12,lr |
| 776 | mov r3, r0 |
| 777 | bl m_m68k_read16_wordram1_1M_b1 @ must not trash r12 and r3 |
| 778 | add r1, r3, #2 |
| 779 | mov r3, r0 |
| 780 | mov r0, r1 |
| 781 | bl m_m68k_read16_wordram1_1M_b1 |
| 782 | orr r0, r0, r3, lsl #16 |
| 783 | bx r12 |
| 784 | |
| 785 | |
| 786 | @ it is not very practical to use long access on hw registers, so I assume it is not used too much. |
| 787 | m_m68k_read32_system_io: |
| 788 | bic r1, r0, #0xfe0000 |
| 789 | bic r1, r1, #0x3f |
| 790 | cmp r1, #0x012000 |
| 791 | bne m_m68k_read32_misc |
| 792 | and r1, r0, #0x3e |
| 793 | cmp r1, #0x0e |
| 794 | blt m_m68k_read32_misc |
| 795 | cmp r1, #0x30 |
| 796 | movge r0, #0 |
| 797 | bxge lr |
| 798 | @ I have seen the range 0x0e-0x2f accessed quite frequently with long i/o, so here is some code for that |
| 799 | ldr r0, =(Pico+0x22200) |
| 800 | mov r2, #0xff |
| 801 | ldr r0, [r0] |
| 802 | orr r2, r2, r2, lsl #16 |
| 803 | add r0, r0, #0x110000 |
| 804 | m_read32_gen |
| 805 | and r1, r2, r0 @ data is big-endian read as little, have to byteswap |
| 806 | and r0, r2, r0, lsr #8 |
| 807 | orr r0, r0, r1, lsl #8 |
| 808 | bx lr |
| 809 | |
| 810 | m_m68k_read32_misc: |
| 811 | add r1, r0, #2 |
| 812 | stmfd sp!,{r1,lr} |
| 813 | bl m_m68k_read16_system_io |
| 814 | swp r0, r0, [sp] |
| 815 | bl m_m68k_read16_system_io |
| 816 | ldmfd sp!,{r1,lr} |
| 817 | orr r0, r0, r1, lsl #16 |
| 818 | bx lr |
| 819 | |
| 820 | |
| 821 | m_m68k_read32_vdp: |
| 822 | tst r0, #0x70000 |
| 823 | tsteq r0, #0x000e0 |
| 824 | bxne lr @ invalid read |
| 825 | bic r0, r0, #1 |
| 826 | add r1, r0, #2 |
| 827 | stmfd sp!,{r1,lr} |
| 828 | bl PicoVideoRead |
| 829 | swp r0, r0, [sp] |
| 830 | bl PicoVideoRead |
| 831 | ldmfd sp!,{r1,lr} |
| 832 | orr r0, r0, r1, lsl #16 |
| 833 | bx lr |
| 834 | |
| 835 | |
| 836 | m_m68k_read32_ram: |
| 837 | ldr r1, =Pico |
| 838 | bic r0, r0, #0xff0000 |
| 839 | bic r0, r0, #1 |
| 840 | m_read32_gen |
| 841 | bx lr |
| 842 | |
| 843 | .pool |
| 844 | |
| 845 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 846 | |
| 847 | |
| 848 | m_write_null: |
| 849 | m_m68k_write8_bios: |
| 850 | bx lr |
| 851 | |
| 852 | |
| 853 | m_m68k_write8_prgbank: |
| 854 | ldr r2, =(Pico+0x22200) |
| 855 | eor r0, r0, #1 |
| 856 | ldr r2, [r2] |
| 857 | mov r12,#0x110000 |
| 858 | orr r3, r12, #0x002200 |
| 859 | ldr r3, [r2, r3] |
| 860 | ldr r12,[r2, r12] |
| 861 | tst r3, #0x00020000 @ have bus? |
| 862 | bxeq lr |
| 863 | and r12,r12,#0xc0000000 @ r3 & 0xC0 |
| 864 | add r2, r2, r12, lsr #12 |
| 865 | strb r1, [r2, r0] |
| 866 | bx lr |
| 867 | |
| 868 | |
| 869 | m_m68k_write8_wordram0_2M: @ 0x200000 - 0x21ffff |
| 870 | m_m68k_write8_wordram1_2M: @ 0x220000 - 0x23ffff |
| 871 | ldr r2, =(Pico+0x22200) |
| 872 | sub r0, r0, #0x160000 @ map to our offset, which is 0x0a0000 |
| 873 | ldr r2, [r2] |
| 874 | eor r0, r0, #1 |
| 875 | strb r1, [r2, r0] |
| 876 | bx lr |
| 877 | |
| 878 | |
| 879 | m_m68k_write8_wordram0_1M_b0: @ 0x200000 - 0x21ffff |
| 880 | ldr r2, =(Pico+0x22200) |
| 881 | sub r0, r0, #0x140000 @ map to our offset, which is 0x0c0000 |
| 882 | ldr r2, [r2] |
| 883 | eor r0, r0, #1 |
| 884 | strb r1, [r2, r0] |
| 885 | bx lr |
| 886 | |
| 887 | |
| 888 | m_m68k_write8_wordram0_1M_b1: @ 0x200000 - 0x21ffff |
| 889 | ldr r2, =(Pico+0x22200) |
| 890 | sub r0, r0, #0x120000 @ map to our offset, which is 0x0e0000 |
| 891 | ldr r2, [r2] |
| 892 | eor r0, r0, #1 |
| 893 | strb r1, [r2, r0] |
| 894 | bx lr |
| 895 | |
| 896 | |
| 897 | m_m68k_write8_wordram1_1M_b0: @ 0x220000 - 0x23ffff, cell arranged |
| 898 | mov r3, r1 |
| 899 | cell_map |
| 900 | ldr r2, =(Pico+0x22200) |
| 901 | add r0, r0, #0x0c0000 |
| 902 | ldr r2, [r2] |
| 903 | eor r0, r0, #1 |
| 904 | strb r3, [r2, r0] |
| 905 | bx lr |
| 906 | |
| 907 | |
| 908 | m_m68k_write8_wordram1_1M_b1: @ 0x220000 - 0x23ffff, cell arranged |
| 909 | mov r3, r1 |
| 910 | cell_map |
| 911 | ldr r2, =(Pico+0x22200) |
| 912 | add r0, r0, #0x0e0000 |
| 913 | ldr r2, [r2] |
| 914 | eor r0, r0, #1 |
| 915 | strb r3, [r2, r0] |
| 916 | bx lr |
| 917 | |
| 918 | |
| 919 | m_m68k_write8_system_io: |
| 920 | bic r2, r0, #0xfe0000 |
| 921 | bic r2, r2, #0x3f |
| 922 | cmp r2, #0x012000 |
| 923 | beq m68k_reg_write8 |
| 924 | mov r2, #8 |
| 925 | b OtherWrite8 |
| 926 | |
| 927 | |
| 928 | m_m68k_write8_vdp: |
| 929 | tst r0, #0x70000 |
| 930 | tsteq r0, #0x000e0 |
| 931 | bxne lr @ invalid |
| 932 | and r1, r1, #0xff |
| 933 | orr r1, r1, r1, lsl #8 @ byte access gets mirrored |
| 934 | b PicoVideoWrite |
| 935 | |
| 936 | |
| 937 | m_m68k_write8_ram: |
| 938 | ldr r2, =Pico |
| 939 | bic r0, r0, #0xff0000 |
| 940 | eor r0, r0, #1 |
| 941 | strb r1, [r2, r0] |
| 942 | bx lr |
| 943 | |
| 944 | |
| 945 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 946 | |
| 947 | |
| 948 | m_m68k_write16_bios: |
| 949 | bx lr |
| 950 | |
| 951 | |
| 952 | m_m68k_write16_prgbank: |
| 953 | ldr r2, =(Pico+0x22200) |
| 954 | bic r0, r0, #1 |
| 955 | ldr r2, [r2] |
| 956 | mov r12,#0x110000 |
| 957 | orr r3, r12, #0x002200 |
| 958 | ldr r3, [r2, r3] |
| 959 | ldr r12,[r2, r12] |
| 960 | tst r3, #0x00020000 @ have bus? |
| 961 | bxeq lr |
| 962 | and r12,r12,#0xc0000000 @ r3 & 0xC0 |
| 963 | add r2, r2, r12, lsr #12 |
| 964 | strh r1, [r2, r0] |
| 965 | bx lr |
| 966 | |
| 967 | |
| 968 | m_m68k_write16_wordram0_2M: @ 0x200000 - 0x21ffff |
| 969 | m_m68k_write16_wordram1_2M: @ 0x220000 - 0x23ffff |
| 970 | ldr r2, =(Pico+0x22200) |
| 971 | sub r0, r0, #0x160000 @ map to our offset, which is 0x0a0000 |
| 972 | ldr r2, [r2] |
| 973 | bic r0, r0, #1 |
| 974 | strh r1, [r2, r0] |
| 975 | bx lr |
| 976 | |
| 977 | |
| 978 | m_m68k_write16_wordram0_1M_b0: @ 0x200000 - 0x21ffff |
| 979 | ldr r2, =(Pico+0x22200) |
| 980 | sub r0, r0, #0x140000 @ map to our offset, which is 0x0c0000 |
| 981 | ldr r2, [r2] |
| 982 | bic r0, r0, #1 |
| 983 | strh r1, [r2, r0] |
| 984 | bx lr |
| 985 | |
| 986 | |
| 987 | m_m68k_write16_wordram0_1M_b1: @ 0x200000 - 0x21ffff |
| 988 | ldr r2, =(Pico+0x22200) |
| 989 | sub r0, r0, #0x120000 @ map to our offset, which is 0x0e0000 |
| 990 | ldr r2, [r2] |
| 991 | bic r0, r0, #1 |
| 992 | strh r1, [r2, r0] |
| 993 | bx lr |
| 994 | |
| 995 | |
| 996 | m_m68k_write16_wordram1_1M_b0: @ 0x220000 - 0x23ffff, cell arranged |
| 997 | @ Warning: write32 relies on NOT using r12 and and keeping data in r3 |
| 998 | mov r3, r1 |
| 999 | cell_map |
| 1000 | ldr r1, =(Pico+0x22200) |
| 1001 | add r0, r0, #0x0c0000 |
| 1002 | ldr r1, [r1] |
| 1003 | bic r0, r0, #1 |
| 1004 | strh r3, [r1, r0] |
| 1005 | bx lr |
| 1006 | |
| 1007 | |
| 1008 | m_m68k_write16_wordram1_1M_b1: @ 0x220000 - 0x23ffff, cell arranged |
| 1009 | mov r3, r1 |
| 1010 | cell_map |
| 1011 | ldr r1, =(Pico+0x22200) |
| 1012 | add r0, r0, #0x0e0000 |
| 1013 | ldr r1, [r1] |
| 1014 | bic r0, r0, #1 |
| 1015 | strh r3, [r1, r0] |
| 1016 | bx lr |
| 1017 | |
| 1018 | |
| 1019 | m_m68k_write16_system_io: |
| 1020 | bic r0, r0, #1 |
| 1021 | bic r2, r0, #0xfe0000 |
| 1022 | bic r2, r2, #0x3f |
| 1023 | cmp r2, #0x012000 |
| 1024 | bne OtherWrite16 |
| 1025 | |
| 1026 | m_m68k_write16_m68k_regs: |
| 1027 | and r3, r1, #0xff |
| 1028 | add r2, r0, #1 |
| 1029 | stmfd sp!,{r2,r3,lr} |
| 1030 | mov r1, r1, lsr #8 |
| 1031 | bl m68k_reg_write8 |
| 1032 | ldmfd sp!,{r0,r1,lr} |
| 1033 | b m68k_reg_write8 |
| 1034 | |
| 1035 | |
| 1036 | m_m68k_write16_vdp: |
| 1037 | tst r0, #0x70000 |
| 1038 | tsteq r0, #0x000e0 |
| 1039 | bxne lr @ invalid |
| 1040 | bic r0, r0, #1 |
| 1041 | b PicoVideoWrite |
| 1042 | |
| 1043 | |
| 1044 | m_m68k_write16_ram: |
| 1045 | ldr r2, =Pico |
| 1046 | bic r0, r0, #0xff0000 |
| 1047 | bic r0, r0, #1 |
| 1048 | strh r1, [r2, r0] |
| 1049 | bx lr |
| 1050 | |
| 1051 | |
| 1052 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 1053 | |
| 1054 | |
| 1055 | m_m68k_write32_bios: |
| 1056 | bx lr |
| 1057 | |
| 1058 | |
| 1059 | m_m68k_write32_prgbank: |
| 1060 | ldr r2, =(Pico+0x22200) |
| 1061 | bic r0, r0, #1 |
| 1062 | ldr r2, [r2] |
| 1063 | mov r12,#0x110000 |
| 1064 | orr r3, r12, #0x002200 |
| 1065 | ldr r3, [r2, r3] |
| 1066 | ldr r12,[r2, r12] |
| 1067 | tst r3, #0x00020000 @ have bus? |
| 1068 | bxeq lr |
| 1069 | and r12,r12,#0xc0000000 @ r3 & 0xC0 |
| 1070 | add r2, r2, r12, lsr #12 |
| 1071 | m_write32_gen |
| 1072 | bx lr |
| 1073 | |
| 1074 | |
| 1075 | m_m68k_write32_wordram0_2M: @ 0x200000 - 0x21ffff |
| 1076 | m_m68k_write32_wordram1_2M: @ 0x220000 - 0x23ffff |
| 1077 | ldr r2, =(Pico+0x22200) |
| 1078 | sub r0, r0, #0x160000 @ map to our offset, which is 0x0a0000 |
| 1079 | ldr r2, [r2] |
| 1080 | bic r0, r0, #1 |
| 1081 | m_write32_gen |
| 1082 | bx lr |
| 1083 | |
| 1084 | |
| 1085 | m_m68k_write32_wordram0_1M_b0: @ 0x200000 - 0x21ffff |
| 1086 | ldr r2, =(Pico+0x22200) |
| 1087 | sub r0, r0, #0x140000 @ map to our offset, which is 0x0c0000 |
| 1088 | ldr r2, [r2] |
| 1089 | bic r0, r0, #1 |
| 1090 | m_write32_gen |
| 1091 | bx lr |
| 1092 | |
| 1093 | |
| 1094 | m_m68k_write32_wordram0_1M_b1: @ 0x200000 - 0x21ffff |
| 1095 | ldr r2, =(Pico+0x22200) |
| 1096 | sub r0, r0, #0x120000 @ map to our offset, which is 0x0e0000 |
| 1097 | ldr r2, [r2] |
| 1098 | bic r0, r0, #1 |
| 1099 | m_write32_gen |
| 1100 | bx lr |
| 1101 | |
| 1102 | |
| 1103 | m_m68k_write32_wordram1_1M_b0: @ 0x220000 - 0x23ffff, cell arranged |
| 1104 | tst r0, #2 |
| 1105 | bne m_m68k_write32_wordram1_1M_b0_unal |
| 1106 | mov r3, r1 |
| 1107 | cell_map |
| 1108 | ldr r2, =(Pico+0x22200) |
| 1109 | add r0, r0, #0x0c0000 |
| 1110 | ldr r2, [r2] |
| 1111 | bic r0, r0, #1 |
| 1112 | mov r1, r3 |
| 1113 | m_write32_gen |
| 1114 | bx lr |
| 1115 | m_m68k_write32_wordram1_1M_b0_unal: |
| 1116 | @ hopefully this doesn't happen too often |
| 1117 | add r12,r0, #2 |
| 1118 | mov r1, r1, ror #16 |
| 1119 | stmfd sp!,{lr} |
| 1120 | bl m_m68k_write16_wordram1_1M_b0 @ must not trash r12 and keep data in r3 |
| 1121 | ldmfd sp!,{lr} |
| 1122 | mov r0, r12 |
| 1123 | mov r1, r3, lsr #16 |
| 1124 | b m_m68k_write16_wordram1_1M_b0 |
| 1125 | |
| 1126 | |
| 1127 | m_m68k_write32_wordram1_1M_b1: @ 0x220000 - 0x23ffff, cell arranged |
| 1128 | tst r0, #2 |
| 1129 | bne m_m68k_write32_wordram1_1M_b1_unal |
| 1130 | mov r3, r1 |
| 1131 | cell_map |
| 1132 | ldr r2, =(Pico+0x22200) |
| 1133 | add r0, r0, #0x0e0000 |
| 1134 | ldr r2, [r2] |
| 1135 | bic r0, r0, #1 |
| 1136 | mov r1, r3 |
| 1137 | m_write32_gen |
| 1138 | bx lr |
| 1139 | m_m68k_write32_wordram1_1M_b1_unal: |
| 1140 | add r12,r0, #2 |
| 1141 | mov r1, r1, ror #16 |
| 1142 | stmfd sp!,{lr} |
| 1143 | bl m_m68k_write16_wordram1_1M_b1 @ same as above |
| 1144 | ldmfd sp!,{lr} |
| 1145 | mov r0, r12 |
| 1146 | mov r1, r3, lsr #16 |
| 1147 | b m_m68k_write16_wordram1_1M_b1 |
| 1148 | |
| 1149 | |
| 1150 | @ it is not very practical to use long access on hw registers, so I assume it is not used too much. |
| 1151 | m_m68k_write32_system_io: |
| 1152 | bic r2, r0, #0xfe0000 |
| 1153 | bic r2, r2, #0x3f |
| 1154 | cmp r2, #0x012000 |
| 1155 | bne m_m68k_write32_misc |
| 1156 | and r2, r0, #0x3e |
| 1157 | cmp r2, #0x10 |
| 1158 | blt m_m68k_write32_regs |
| 1159 | cmp r2, #0x20 |
| 1160 | bxge lr |
| 1161 | @ Handle the 0x10-0x1f range |
| 1162 | ldr r0, =(Pico+0x22200) |
| 1163 | mov r3, #0xff |
| 1164 | ldr r0, [r0] |
| 1165 | orr r3, r3, r3, lsl #16 |
| 1166 | add r0, r0, #0x110000 |
| 1167 | and r12,r3, r1, ror #16 @ data is big-endian to be written as little, have to byteswap |
| 1168 | and r1, r3, r1, ror #24 |
| 1169 | orr r1, r1, r12,lsl #8 @ end of byteswap |
| 1170 | strh r1, [r2, r0]! |
| 1171 | cmp r2, #0x1e |
| 1172 | movne r1, r1, lsr #16 |
| 1173 | strneh r1, [r2, #2] |
| 1174 | bx lr |
| 1175 | |
| 1176 | m_m68k_write32_regs: |
| 1177 | bic r0, r0, #1 |
| 1178 | stmfd sp!,{r0,r1,lr} |
| 1179 | mov r1, r1, lsr #24 |
| 1180 | bl m68k_reg_write8 |
| 1181 | ldr r0, [sp] |
| 1182 | ldr r1, [sp, #4] |
| 1183 | add r0, r0, #1 |
| 1184 | mov r1, r1, lsr #16 |
| 1185 | bl m68k_reg_write8 |
| 1186 | ldr r0, [sp] |
| 1187 | ldr r1, [sp, #4] |
| 1188 | add r0, r0, #2 |
| 1189 | mov r1, r1, lsr #8 |
| 1190 | bl m68k_reg_write8 |
| 1191 | ldmfd sp!,{r0,r1,lr} |
| 1192 | add r0, r0, #3 |
| 1193 | b m68k_reg_write8 |
| 1194 | |
| 1195 | m_m68k_write32_misc: |
| 1196 | bic r0, r0, #1 |
| 1197 | stmfd sp!,{r0,r1,lr} |
| 1198 | mov r1, r1, lsr #16 |
| 1199 | bl OtherWrite16 |
| 1200 | ldmfd sp!,{r0,r1,lr} |
| 1201 | add r0, r0, #2 |
| 1202 | b OtherWrite16 |
| 1203 | |
| 1204 | |
| 1205 | m_m68k_write32_vdp: |
| 1206 | tst r0, #0x70000 |
| 1207 | tsteq r0, #0x000e0 |
| 1208 | bxne lr @ invalid |
| 1209 | stmfd sp!,{r0,r1,lr} |
| 1210 | mov r1, r1, lsr #16 |
| 1211 | bl PicoVideoWrite |
| 1212 | ldmfd sp!,{r0,r1,lr} |
| 1213 | add r0, r0, #2 |
| 1214 | b PicoVideoWrite |
| 1215 | |
| 1216 | |
| 1217 | m_m68k_write32_ram: |
| 1218 | ldr r2, =Pico |
| 1219 | bic r0, r0, #0xff0000 |
| 1220 | bic r0, r0, #1 |
| 1221 | m_write32_gen |
| 1222 | bx lr |
| 1223 | |
| 1224 | .pool |
| 1225 | |
| 1226 | |
| 1227 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 1228 | |
| 1229 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 1230 | |
| 1231 | |
| 1232 | .macro m_s68k_read8_ram map_addr |
| 1233 | ldr r1, =(Pico+0x22200) |
| 1234 | eor r0, r0, #1 |
| 1235 | ldr r1, [r1] |
| 1236 | .if \map_addr |
| 1237 | add r0, r0, #\map_addr @ map to our address |
| 1238 | .endif |
| 1239 | ldrb r0, [r1, r0] |
| 1240 | bx lr |
| 1241 | .endm |
| 1242 | |
| 1243 | .macro m_s68k_read8_wordram_2M_decode map_addr |
| 1244 | ldr r2, =(Pico+0x22200) |
| 1245 | eor r0, r0, #2 |
| 1246 | ldr r2, [r2] |
| 1247 | movs r0, r0, lsr #1 @ +4-6 <<16 |
| 1248 | add r2, r2, #\map_addr @ map to our address |
| 1249 | ldrb r0, [r2, r0] |
| 1250 | movcc r0, r0, lsr #4 |
| 1251 | andcs r0, r0, #0xf |
| 1252 | bx lr |
| 1253 | .endm |
| 1254 | |
| 1255 | |
| 1256 | m_s68k_read8_prg: @ 0x000000 - 0x07ffff |
| 1257 | m_s68k_read8_wordram_2M: @ 0x080000 - 0x0bffff |
| 1258 | m_s68k_read8_wordram_1M_b1: @ 0x0c0000 - 0x0dffff, maps to 0x0e0000 |
| 1259 | m_s68k_read8_ram 0x020000 |
| 1260 | |
| 1261 | |
| 1262 | m_s68k_read8_wordram_2M_decode_b0: @ 0x080000 - 0x0bffff |
| 1263 | m_s68k_read8_wordram_2M_decode 0x080000 @ + ^ / 2 |
| 1264 | |
| 1265 | |
| 1266 | m_s68k_read8_wordram_2M_decode_b1: @ 0x080000 - 0x0bffff |
| 1267 | m_s68k_read8_wordram_2M_decode 0x0a0000 @ + ^ / 2 |
| 1268 | |
| 1269 | |
| 1270 | m_s68k_read8_wordram_1M_b0: @ 0x0c0000 - 0x0dffff (same as our offset :) |
| 1271 | m_s68k_read8_ram 0 |
| 1272 | |
| 1273 | |
| 1274 | m_s68k_read8_backup: @ 0xfe0000 - 0xfe3fff (repeated?) |
| 1275 | @ must not trash r3 and r12 |
| 1276 | ldr r1, =(Pico+0x22200) |
| 1277 | mov r0, r0, lsr #1 |
| 1278 | ldr r1, [r1] |
| 1279 | bic r0, r0, #0xff0000 |
| 1280 | bic r0, r0, #0x00e000 |
| 1281 | add r1, r1, #0x110000 |
| 1282 | add r1, r1, #0x000200 |
| 1283 | ldrb r0, [r1, r0] |
| 1284 | bx lr |
| 1285 | |
| 1286 | |
| 1287 | m_s68k_read8_pcm: |
| 1288 | @ must not trash r3 and r12 |
| 1289 | ldr r1, =(Pico+0x22200) |
| 1290 | bic r0, r0, #0xff0000 |
| 1291 | @ bic r0, r0, #0x008000 |
| 1292 | ldr r1, [r1] |
| 1293 | mov r2, #0x110000 |
| 1294 | orr r2, r2, #0x002200 |
| 1295 | cmp r0, #0x2000 |
| 1296 | bge m_s68k_read8_pcm_ram |
| 1297 | cmp r0, #0x20 |
| 1298 | movlt r0, #0 |
| 1299 | bxlt lr |
| 1300 | orr r2, r2, #(0x48+8) @ pcm.ch + addr_offset |
| 1301 | add r1, r1, r2 |
| 1302 | and r2, r0, #0x1c |
| 1303 | ldr r1, [r1, r2, lsl #2] |
| 1304 | tst r0, #2 |
| 1305 | moveq r0, r1, lsr #PCM_STEP_SHIFT |
| 1306 | movne r0, r1, lsr #(PCM_STEP_SHIFT+8) |
| 1307 | and r0, r0, #0xff |
| 1308 | bx lr |
| 1309 | |
| 1310 | m_s68k_read8_pcm_ram: |
| 1311 | orr r2, r2, #0x40 |
| 1312 | ldr r2, [r1, r2] |
| 1313 | add r1, r1, #0x100000 @ pcm_ram |
| 1314 | and r2, r2, #0x0f000000 @ bank |
| 1315 | add r1, r1, r2, lsr #12 |
| 1316 | bic r0, r0, #0x00e000 |
| 1317 | mov r0, r0, lsr #1 |
| 1318 | ldrb r0, [r1, r0] |
| 1319 | bx lr |
| 1320 | |
| 1321 | |
| 1322 | m_s68k_read8_regs: |
| 1323 | bic r0, r0, #0xff0000 |
| 1324 | bic r0, r0, #0x008000 |
| 1325 | tst r0, #0x7e00 |
| 1326 | movne r0, #0 |
| 1327 | bxne lr |
| 1328 | sub r2, r0, #0x58 |
| 1329 | cmp r2, #0x10 |
| 1330 | ldrlo r2, =gfx_cd_read |
| 1331 | ldrhs r2, =s68k_reg_read16 |
| 1332 | stmfd sp!,{r0,lr} |
| 1333 | bic r0, r0, #1 |
| 1334 | mov lr, pc |
| 1335 | bx r2 |
| 1336 | ldmfd sp!,{r1,lr} |
| 1337 | tst r1, #1 |
| 1338 | moveq r0, r0, lsr #8 |
| 1339 | and r0, r0, #0xff |
| 1340 | bx lr |
| 1341 | |
| 1342 | |
| 1343 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 1344 | |
| 1345 | |
| 1346 | .macro m_s68k_read16_ram map_addr |
| 1347 | ldr r1, =(Pico+0x22200) |
| 1348 | bic r0, r0, #1 |
| 1349 | ldr r1, [r1] |
| 1350 | .if \map_addr |
| 1351 | add r0, r0, #\map_addr @ map to our address |
| 1352 | .endif |
| 1353 | ldrh r0, [r1, r0] |
| 1354 | bx lr |
| 1355 | .endm |
| 1356 | |
| 1357 | .macro m_s68k_read16_wordram_2M_decode map_addr |
| 1358 | ldr r2, =(Pico+0x22200) |
| 1359 | eor r0, r0, #2 |
| 1360 | ldr r2, [r2] |
| 1361 | mov r0, r0, lsr #1 @ +4-6 <<16 |
| 1362 | add r2, r2, #\map_addr @ map to our address |
| 1363 | ldrb r0, [r2, r0] |
| 1364 | orr r0, r0, r0, lsl #4 |
| 1365 | bic r0, r0, #0xf0 |
| 1366 | bx lr |
| 1367 | .endm |
| 1368 | |
| 1369 | |
| 1370 | m_s68k_read16_prg: @ 0x000000 - 0x07ffff |
| 1371 | m_s68k_read16_wordram_2M: @ 0x080000 - 0x0bffff |
| 1372 | m_s68k_read16_wordram_1M_b1: @ 0x0c0000 - 0x0dffff, maps to 0x0e0000 |
| 1373 | m_s68k_read16_ram 0x020000 |
| 1374 | |
| 1375 | |
| 1376 | m_s68k_read16_wordram_2M_decode_b0: @ 0x080000 - 0x0bffff |
| 1377 | m_s68k_read16_wordram_2M_decode 0x080000 |
| 1378 | |
| 1379 | |
| 1380 | m_s68k_read16_wordram_2M_decode_b1: @ 0x080000 - 0x0bffff |
| 1381 | m_s68k_read16_wordram_2M_decode 0x0a0000 |
| 1382 | |
| 1383 | |
| 1384 | m_s68k_read16_wordram_1M_b0: @ 0x0c0000 - 0x0dffff (same as our offset :) |
| 1385 | m_s68k_read16_ram 0 |
| 1386 | |
| 1387 | |
| 1388 | @ m_s68k_read16_backup: @ 0xfe0000 - 0xfe3fff (repeated?) |
| 1389 | @ bram is not meant to be accessed by words, does any game do this? |
| 1390 | .equiv m_s68k_read16_backup, m_s68k_read8_backup |
| 1391 | |
| 1392 | |
| 1393 | @ m_s68k_read16_pcm: |
| 1394 | @ pcm is on 8-bit bus, would this be same as byte access? |
| 1395 | .equiv m_s68k_read16_pcm, m_s68k_read8_pcm |
| 1396 | |
| 1397 | |
| 1398 | m_s68k_read16_regs: |
| 1399 | bic r0, r0, #0xff0000 |
| 1400 | bic r0, r0, #0x008000 |
| 1401 | bic r0, r0, #0x000001 |
| 1402 | tst r0, #0x7e00 |
| 1403 | movne r0, #0 |
| 1404 | bxne lr |
| 1405 | sub r2, r0, #0x58 |
| 1406 | cmp r2, #0x10 |
| 1407 | blo gfx_cd_read |
| 1408 | b s68k_reg_read16 |
| 1409 | |
| 1410 | |
| 1411 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 1412 | |
| 1413 | |
| 1414 | .macro m_s68k_read32_ram map_addr |
| 1415 | ldr r1, =(Pico+0x22200) |
| 1416 | bic r0, r0, #1 |
| 1417 | ldr r1, [r1] |
| 1418 | .if \map_addr |
| 1419 | add r0, r0, #\map_addr @ map to our address |
| 1420 | .endif |
| 1421 | m_read32_gen |
| 1422 | bx lr |
| 1423 | .endm |
| 1424 | |
| 1425 | .macro m_s68k_read32_wordram_2M_decode map_addr |
| 1426 | ldr r2, =(Pico+0x22200) |
| 1427 | eor r0, r0, #2 |
| 1428 | ldr r2, [r2] |
| 1429 | mov r0, r0, lsr #1 @ +4-6 <<16 |
| 1430 | add r2, r2, #\map_addr @ map to our address |
| 1431 | ldrb r1, [r2, r0]! |
| 1432 | tst r0, #1 |
| 1433 | ldrneb r0, [r2, #-1] |
| 1434 | ldreqb r0, [r2, #2] |
| 1435 | orr r1, r1, r1, lsl #4 |
| 1436 | bic r1, r1, #0xf0 |
| 1437 | orr r0, r0, r0, lsl #4 |
| 1438 | bic r0, r0, #0xf0 |
| 1439 | orr r0, r0, r1, lsl #16 |
| 1440 | bx lr |
| 1441 | .endm |
| 1442 | |
| 1443 | |
| 1444 | m_s68k_read32_prg: @ 0x000000 - 0x07ffff |
| 1445 | m_s68k_read32_wordram_2M: @ 0x080000 - 0x0bffff |
| 1446 | m_s68k_read32_wordram_1M_b1: @ 0x0c0000 - 0x0dffff, maps to 0x0e0000 |
| 1447 | m_s68k_read32_ram 0x020000 |
| 1448 | |
| 1449 | |
| 1450 | m_s68k_read32_wordram_2M_decode_b0: @ 0x080000 - 0x0bffff |
| 1451 | m_s68k_read32_wordram_2M_decode 0x080000 |
| 1452 | |
| 1453 | |
| 1454 | m_s68k_read32_wordram_2M_decode_b1: @ 0x080000 - 0x0bffff |
| 1455 | m_s68k_read32_wordram_2M_decode 0x0a0000 |
| 1456 | |
| 1457 | |
| 1458 | m_s68k_read32_wordram_1M_b0: @ 0x0c0000 - 0x0dffff (same as our offset :) |
| 1459 | m_s68k_read32_ram 0 |
| 1460 | |
| 1461 | |
| 1462 | m_s68k_read32_backup: @ 0xfe0000 - 0xfe3fff (repeated?) |
| 1463 | @ bram is not meant to be accessed by words, does any game do this? |
| 1464 | mov r12,lr |
| 1465 | mov r3, r0 |
| 1466 | bl m_s68k_read8_backup @ must preserve r3 and r12 |
| 1467 | mov r1, r0 |
| 1468 | add r0, r3, #2 |
| 1469 | mov r3, r1 |
| 1470 | bl m_s68k_read8_backup |
| 1471 | orr r0, r0, r3, lsl #16 |
| 1472 | bx r12 |
| 1473 | |
| 1474 | |
| 1475 | m_s68k_read32_pcm: |
| 1476 | mov r12,lr |
| 1477 | mov r3, r0 |
| 1478 | bl m_s68k_read8_pcm @ must preserve r3 and r12 |
| 1479 | mov r1, r0 |
| 1480 | add r0, r3, #2 |
| 1481 | mov r3, r1 |
| 1482 | bl m_s68k_read8_pcm |
| 1483 | orr r0, r0, r3, lsl #16 |
| 1484 | bx r12 |
| 1485 | |
| 1486 | |
| 1487 | m_s68k_read32_regs: |
| 1488 | bic r0, r0, #0xff0000 |
| 1489 | bic r0, r0, #0x008000 |
| 1490 | bic r0, r0, #0x000001 |
| 1491 | tst r0, #0x7e00 |
| 1492 | movne r0, #0 |
| 1493 | bxne lr |
| 1494 | sub r2, r0, #0x58 |
| 1495 | cmp r2, #0x10 |
| 1496 | add r1, r0, #2 |
| 1497 | blo m_s68k_read32_regs_gfx |
| 1498 | stmfd sp!,{r1,lr} |
| 1499 | bl s68k_reg_read16 |
| 1500 | swp r0, r0, [sp] |
| 1501 | bl s68k_reg_read16 |
| 1502 | ldmfd sp!,{r1,lr} |
| 1503 | orr r0, r0, r1, lsl #16 |
| 1504 | bx lr |
| 1505 | |
| 1506 | |
| 1507 | m_s68k_read32_regs_gfx: |
| 1508 | stmfd sp!,{r1,lr} |
| 1509 | bl gfx_cd_read |
| 1510 | swp r0, r0, [sp] |
| 1511 | bl gfx_cd_read |
| 1512 | ldmfd sp!,{r1,lr} |
| 1513 | orr r0, r0, r1, lsl #16 |
| 1514 | bx lr |
| 1515 | |
| 1516 | .pool |
| 1517 | |
| 1518 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 1519 | |
| 1520 | |
| 1521 | .macro m_s68k_write8_ram map_addr |
| 1522 | ldr r2, =(Pico+0x22200) |
| 1523 | eor r0, r0, #1 |
| 1524 | ldr r2, [r2] |
| 1525 | .if \map_addr |
| 1526 | add r0, r0, #\map_addr @ map to our address |
| 1527 | .endif |
| 1528 | strb r1, [r2, r0] |
| 1529 | bx lr |
| 1530 | .endm |
| 1531 | |
| 1532 | |
| 1533 | m_s68k_write8_prg: @ 0x000000 - 0x07ffff |
| 1534 | m_s68k_write8_wordram_2M: @ 0x080000 - 0x0bffff |
| 1535 | m_s68k_write8_wordram_1M_b1: @ 0x0c0000 - 0x0dffff, maps to 0x0e0000 |
| 1536 | m_s68k_write8_ram 0x020000 |
| 1537 | |
| 1538 | |
| 1539 | m_s68k_write8_wordram_2M_decode_b0: @ 0x080000 - 0x0bffff |
| 1540 | m_s68k_write8_wordram_2M_decode_b1: @ 0x080000 - 0x0bffff |
| 1541 | bx lr @ TODO |
| 1542 | |
| 1543 | |
| 1544 | m_s68k_write8_wordram_1M_b0: @ 0x0c0000 - 0x0dffff (same as our offset :) |
| 1545 | m_s68k_write8_ram 0 |
| 1546 | |
| 1547 | |
| 1548 | m_s68k_write8_backup: @ 0xfe0000 - 0xfe3fff (repeated?) |
| 1549 | @ must not trash r3 and r12 |
| 1550 | ldr r2, =(Pico+0x22200) |
| 1551 | mov r0, r0, lsr #1 |
| 1552 | ldr r2, [r2] |
| 1553 | bic r0, r0, #0xff0000 |
| 1554 | bic r0, r0, #0x00e000 |
| 1555 | add r2, r2, #0x110000 |
| 1556 | add r2, r2, #0x000200 |
| 1557 | strb r1, [r2, r0] |
| 1558 | ldr r1, =SRam |
| 1559 | mov r0, #1 |
| 1560 | str r0, [r1, #0x0e] @ SRam.changed = 1 |
| 1561 | bx lr |
| 1562 | |
| 1563 | |
| 1564 | m_s68k_write8_pcm: |
| 1565 | bic r0, r0, #0xff0000 |
| 1566 | cmp r0, #0x12 |
| 1567 | movlt r0, r0, lsr #1 |
| 1568 | blt pcm_write |
| 1569 | |
| 1570 | cmp r0, #0x2000 |
| 1571 | bxlt lr |
| 1572 | |
| 1573 | m_s68k_write8_pcm_ram: |
| 1574 | ldr r3, =(Pico+0x22200) |
| 1575 | bic r0, r0, #0x00e000 |
| 1576 | ldr r3, [r3] |
| 1577 | mov r0, r0, lsr #1 |
| 1578 | add r2, r3, #0x110000 |
| 1579 | add r2, r2, #0x002200 |
| 1580 | add r2, r2, #0x000040 |
| 1581 | ldr r2, [r2] |
| 1582 | add r3, r3, #0x100000 @ pcm_ram |
| 1583 | and r2, r2, #0x0f000000 @ bank |
| 1584 | add r3, r3, r2, lsr #12 |
| 1585 | strb r1, [r3, r0] |
| 1586 | bx lr |
| 1587 | |
| 1588 | |
| 1589 | m_s68k_write8_regs: |
| 1590 | bic r0, r0, #0xff0000 |
| 1591 | bic r0, r0, #0x008000 |
| 1592 | tst r0, #0x7e00 |
| 1593 | movne r0, #0 |
| 1594 | bxne lr |
| 1595 | sub r2, r0, #0x58 |
| 1596 | cmp r2, #0x10 |
| 1597 | bhs s68k_reg_write8 |
| 1598 | bic r0, r0, #1 |
| 1599 | orr r1, r1, r1, lsl #8 |
| 1600 | b gfx_cd_write16 |
| 1601 | |
| 1602 | |
| 1603 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 1604 | |
| 1605 | |
| 1606 | .macro m_s68k_write16_ram map_addr |
| 1607 | ldr r2, =(Pico+0x22200) |
| 1608 | bic r0, r0, #1 |
| 1609 | ldr r2, [r2] |
| 1610 | .if \map_addr |
| 1611 | add r0, r0, #\map_addr @ map to our address |
| 1612 | .endif |
| 1613 | strh r1, [r2, r0] |
| 1614 | bx lr |
| 1615 | .endm |
| 1616 | |
| 1617 | |
| 1618 | m_s68k_write16_prg: @ 0x000000 - 0x07ffff |
| 1619 | m_s68k_write16_wordram_2M: @ 0x080000 - 0x0bffff |
| 1620 | m_s68k_write16_wordram_1M_b1: @ 0x0c0000 - 0x0dffff, maps to 0x0e0000 |
| 1621 | m_s68k_write16_ram 0x020000 |
| 1622 | |
| 1623 | |
| 1624 | m_s68k_write16_wordram_2M_decode_b0: @ 0x080000 - 0x0bffff |
| 1625 | m_s68k_write16_wordram_2M_decode_b1: @ 0x080000 - 0x0bffff |
| 1626 | bx lr @ TODO |
| 1627 | |
| 1628 | |
| 1629 | m_s68k_write16_wordram_1M_b0: @ 0x0c0000 - 0x0dffff (same as our offset :) |
| 1630 | m_s68k_write16_ram 0 |
| 1631 | |
| 1632 | |
| 1633 | @ m_s68k_write16_backup: |
| 1634 | .equiv m_s68k_write16_backup, m_s68k_write8_backup |
| 1635 | |
| 1636 | |
| 1637 | @ m_s68k_write16_pcm: |
| 1638 | .equiv m_s68k_write16_pcm, m_s68k_write8_pcm |
| 1639 | |
| 1640 | |
| 1641 | m_s68k_write16_regs: |
| 1642 | bic r0, r0, #0xff0000 |
| 1643 | bic r0, r0, #0x008000 |
| 1644 | bic r0, r0, #1 |
| 1645 | tst r0, #0x7e00 |
| 1646 | movne r0, #0 |
| 1647 | bxne lr |
| 1648 | cmp r0, #0x0e |
| 1649 | beq m_s68k_write16_regs_spec |
| 1650 | sub r2, r0, #0x58 |
| 1651 | cmp r2, #0x10 |
| 1652 | blo gfx_cd_write16 |
| 1653 | and r3, r1, #0xff |
| 1654 | add r2, r0, #1 |
| 1655 | stmfd sp!,{r2,r3,lr} |
| 1656 | mov r1, r1, lsr #8 |
| 1657 | bl s68k_reg_write8 |
| 1658 | ldmfd sp!,{r0,r1,lr} |
| 1659 | b s68k_reg_write8 |
| 1660 | |
| 1661 | m_s68k_write16_regs_spec: @ special case |
| 1662 | ldr r2, =(Pico+0x22200) |
| 1663 | mov r0, #0x110000 |
| 1664 | ldr r2, [r2] |
| 1665 | add r0, r0, #0x00000f |
| 1666 | strb r1, [r2, r0] @ if (a == 0xe) s68k_regs[0xf] = d; |
| 1667 | bxeq lr |
| 1668 | |
| 1669 | |
| 1670 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 1671 | |
| 1672 | |
| 1673 | .macro m_s68k_write32_ram map_addr |
| 1674 | ldr r2, =(Pico+0x22200) |
| 1675 | bic r0, r0, #1 |
| 1676 | ldr r2, [r2] |
| 1677 | .if \map_addr |
| 1678 | add r0, r0, #\map_addr @ map to our address |
| 1679 | .endif |
| 1680 | m_write32_gen |
| 1681 | bx lr |
| 1682 | .endm |
| 1683 | |
| 1684 | |
| 1685 | m_s68k_write32_prg: @ 0x000000 - 0x07ffff |
| 1686 | m_s68k_write32_wordram_2M: @ 0x080000 - 0x0bffff |
| 1687 | m_s68k_write32_wordram_1M_b1: @ 0x0c0000 - 0x0dffff, maps to 0x0e0000 |
| 1688 | m_s68k_write32_ram 0x020000 |
| 1689 | |
| 1690 | |
| 1691 | m_s68k_write32_wordram_2M_decode_b0: @ 0x080000 - 0x0bffff |
| 1692 | m_s68k_write32_wordram_2M_decode_b1: @ 0x080000 - 0x0bffff |
| 1693 | bx lr @ TODO |
| 1694 | |
| 1695 | |
| 1696 | m_s68k_write32_wordram_1M_b0: @ 0x0c0000 - 0x0dffff (same as our offset :) |
| 1697 | m_s68k_write32_ram 0 |
| 1698 | |
| 1699 | |
| 1700 | m_s68k_write32_backup: |
| 1701 | add r12,r0, #2 |
| 1702 | mov r3, r1 |
| 1703 | mov r1, r1, lsr #16 |
| 1704 | stmfd sp!,{lr} |
| 1705 | bl m_s68k_write8_backup @ must preserve r3 and r12 |
| 1706 | ldmfd sp!,{lr} |
| 1707 | mov r0, r12 |
| 1708 | mov r1, r3 |
| 1709 | b m_s68k_write8_backup |
| 1710 | |
| 1711 | |
| 1712 | m_s68k_write32_pcm: |
| 1713 | bic r0, r0, #0xff0000 |
| 1714 | cmp r0, #0x12 |
| 1715 | blt m_s68k_write32_pcm_reg |
| 1716 | |
| 1717 | cmp r0, #0x2000 |
| 1718 | bxlt lr |
| 1719 | |
| 1720 | m_s68k_write32_pcm_ram: |
| 1721 | ldr r3, =(Pico+0x22200) |
| 1722 | bic r0, r0, #0x00e000 |
| 1723 | ldr r3, [r3] |
| 1724 | mov r0, r0, lsr #1 |
| 1725 | add r2, r3, #0x110000 |
| 1726 | add r2, r2, #0x002200 |
| 1727 | add r2, r2, #0x000040 |
| 1728 | ldr r2, [r2] |
| 1729 | add r3, r3, #0x100000 @ pcm_ram |
| 1730 | and r2, r2, #0x0f000000 @ bank |
| 1731 | add r3, r3, r2, lsr #12 |
| 1732 | mov r1, r1, ror #16 |
| 1733 | strb r1, [r3, r0]! |
| 1734 | mov r1, r1, ror #16 |
| 1735 | strb r1, [r3] |
| 1736 | bx lr |
| 1737 | |
| 1738 | m_s68k_write32_pcm_reg: |
| 1739 | mov r0, r0, lsr #1 |
| 1740 | add r2, r0, #1 |
| 1741 | mov r3, r1 |
| 1742 | stmfd sp!,{r2,r3,lr} |
| 1743 | mov r1, r1, lsr #16 |
| 1744 | bl pcm_write |
| 1745 | ldmfd sp!,{r0,r1,lr} |
| 1746 | b pcm_write |
| 1747 | |
| 1748 | |
| 1749 | m_s68k_write32_regs: |
| 1750 | bic r0, r0, #0xff0000 |
| 1751 | bic r0, r0, #0x008000 |
| 1752 | bic r0, r0, #1 |
| 1753 | tst r0, #0x7e00 |
| 1754 | movne r0, #0 |
| 1755 | bxne lr |
| 1756 | sub r2, r0, #0x58 |
| 1757 | cmp r2, #0x10 |
| 1758 | blo m_s68k_write32_regs_gfx |
| 1759 | |
| 1760 | stmfd sp!,{r0,r1,lr} |
| 1761 | mov r1, r1, lsr #24 |
| 1762 | bl s68k_reg_write8 |
| 1763 | ldr r0, [sp] |
| 1764 | ldr r1, [sp, #4] |
| 1765 | add r0, r0, #1 |
| 1766 | mov r1, r1, lsr #16 |
| 1767 | bl s68k_reg_write8 |
| 1768 | ldr r0, [sp] |
| 1769 | ldr r1, [sp, #4] |
| 1770 | add r0, r0, #2 |
| 1771 | mov r1, r1, lsr #8 |
| 1772 | bl s68k_reg_write8 |
| 1773 | ldmfd sp!,{r0,r1,lr} |
| 1774 | add r0, r0, #3 |
| 1775 | b s68k_reg_write8 |
| 1776 | |
| 1777 | m_s68k_write32_regs_gfx: |
| 1778 | mov r3, r1 |
| 1779 | add r2, r0, #2 |
| 1780 | stmfd sp!,{r2,r3,lr} |
| 1781 | mov r1, r1, lsr #16 |
| 1782 | bl gfx_cd_write16 |
| 1783 | ldmfd sp!,{r0,r1,lr} |
| 1784 | b gfx_cd_write16 |
| 1785 | |