| 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 | .equiv POLL_LIMIT, 16 |
| 11 | |
| 12 | @ jump tables |
| 13 | .data |
| 14 | .align 4 |
| 15 | |
| 16 | .altmacro |
| 17 | .macro mk_m68k_jump_table on sz @ operation name, size |
| 18 | .long m_m68k_&\on&\sz&_bios @ 0x000000 - 0x01ffff |
| 19 | .long m_m68k_&\on&\sz&_prgbank @ 0x020000 - 0x03ffff |
| 20 | .long m_&\on&_null, m_&\on&_null @ 0x040000 - 0x07ffff |
| 21 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x080000 - 0x0fffff |
| 22 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x100000 - 0x17ffff |
| 23 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x180000 - 0x1fffff |
| 24 | .long m_m68k_&\on&\sz&_wordram0_2M @ 0x200000 - 0x21ffff |
| 25 | .long m_m68k_&\on&\sz&_wordram1_2M @ 0x220000 - 0x23ffff |
| 26 | .long m_&\on&_null, m_&\on&_null @ 0x240000 - 0x27ffff |
| 27 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x280000 - 0x2fffff |
| 28 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x300000 |
| 29 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ - 0x3fffff |
| 30 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x400000 |
| 31 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ - 0x4fffff |
| 32 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x500000 |
| 33 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ - 0x5fffff |
| 34 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x600000 |
| 35 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ - 0x6fffff |
| 36 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x700000 |
| 37 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ - 0x7fffff |
| 38 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x800000 |
| 39 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ - 0x8fffff |
| 40 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x900000 |
| 41 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ - 0x9fffff |
| 42 | .long m_m68k_&\on&\sz&_system_io @ 0xa00000 - 0xa1ffff |
| 43 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0xa20000 - 0xa7ffff |
| 44 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0xa80000 - 0xafffff |
| 45 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0xb00000 |
| 46 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ - 0xbfffff |
| 47 | .long m_m68k_&\on&\sz&_vdp, m_m68k_&\on&\sz&_vdp, m_m68k_&\on&\sz&_vdp, m_m68k_&\on&\sz&_vdp @ 0xc00000 |
| 48 | .long m_m68k_&\on&\sz&_vdp, m_m68k_&\on&\sz&_vdp, m_m68k_&\on&\sz&_vdp, m_m68k_&\on&\sz&_vdp @ - 0xcfffff |
| 49 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0xd00000 |
| 50 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ - 0xdfffff |
| 51 | .long m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram @ 0xe00000 |
| 52 | .long m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram @ - 0xefffff |
| 53 | .long m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram @ 0xf00000 |
| 54 | .long m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram @ - 0xffffff |
| 55 | .endm |
| 56 | |
| 57 | .macro mk_s68k_jump_table on sz @ operation name, size |
| 58 | .long m_s68k_&\on&\sz&_prg, m_s68k_&\on&\sz&_prg, m_s68k_&\on&\sz&_prg, m_s68k_&\on&\sz&_prg @ 0x000000 - 0x07ffff |
| 59 | .long m_s68k_&\on&\sz&_wordram_2M @ 0x080000 - 0x09ffff |
| 60 | .long m_s68k_&\on&\sz&_wordram_2M @ 0x0a0000 - 0x0bffff |
| 61 | .long m_&\on&_null @ 0x0c0000 - 0x0dffff, 1M area |
| 62 | .long m_&\on&_null @ 0x0e0000 - 0x0fffff |
| 63 | .endm |
| 64 | |
| 65 | |
| 66 | @ the jumptables themselves. |
| 67 | m_m68k_read8_table: mk_m68k_jump_table read 8 |
| 68 | m_m68k_read16_table: mk_m68k_jump_table read 16 |
| 69 | m_m68k_read32_table: mk_m68k_jump_table read 32 |
| 70 | m_m68k_write8_table: mk_m68k_jump_table write 8 |
| 71 | m_m68k_write16_table: mk_m68k_jump_table write 16 |
| 72 | m_m68k_write32_table: mk_m68k_jump_table write 32 |
| 73 | |
| 74 | m_s68k_read8_table: mk_s68k_jump_table read 8 |
| 75 | m_s68k_read16_table: mk_s68k_jump_table read 16 |
| 76 | m_s68k_read32_table: mk_s68k_jump_table read 32 |
| 77 | m_s68k_write8_table: mk_s68k_jump_table write 8 |
| 78 | m_s68k_write16_table: mk_s68k_jump_table write 16 |
| 79 | m_s68k_write32_table: mk_s68k_jump_table write 32 |
| 80 | |
| 81 | m_s68k_decode_write_table: |
| 82 | .long m_s68k_write8_2M_decode_b0_m0 |
| 83 | .long m_s68k_write16_2M_decode_b0_m0 |
| 84 | .long m_s68k_write32_2M_decode_b0_m0 |
| 85 | .long m_s68k_write8_2M_decode_b0_m1 |
| 86 | .long m_s68k_write16_2M_decode_b0_m1 |
| 87 | .long m_s68k_write32_2M_decode_b0_m1 |
| 88 | .long m_s68k_write8_2M_decode_b0_m2 |
| 89 | .long m_s68k_write16_2M_decode_b0_m2 |
| 90 | .long m_s68k_write32_2M_decode_b0_m2 |
| 91 | .long m_s68k_write8_2M_decode_b1_m0 |
| 92 | .long m_s68k_write16_2M_decode_b1_m0 |
| 93 | .long m_s68k_write32_2M_decode_b1_m0 |
| 94 | .long m_s68k_write8_2M_decode_b1_m1 |
| 95 | .long m_s68k_write16_2M_decode_b1_m1 |
| 96 | .long m_s68k_write32_2M_decode_b1_m1 |
| 97 | .long m_s68k_write8_2M_decode_b1_m2 |
| 98 | .long m_s68k_write16_2M_decode_b1_m2 |
| 99 | .long m_s68k_write32_2M_decode_b1_m2 |
| 100 | |
| 101 | |
| 102 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 103 | |
| 104 | .text |
| 105 | .align 4 |
| 106 | |
| 107 | .global PicoMemResetCD |
| 108 | .global PicoMemResetCDdecode |
| 109 | .global PicoReadM68k8 |
| 110 | .global PicoReadM68k16 |
| 111 | .global PicoReadM68k32 |
| 112 | .global PicoWriteM68k8 |
| 113 | .global PicoWriteM68k16 |
| 114 | .global PicoWriteM68k32 |
| 115 | .global PicoReadS68k8 |
| 116 | .global PicoReadS68k16 |
| 117 | .global PicoReadS68k32 |
| 118 | .global PicoWriteS68k8 |
| 119 | .global PicoWriteS68k16 |
| 120 | .global PicoWriteS68k32 |
| 121 | |
| 122 | @ externs, just for reference |
| 123 | .extern Pico |
| 124 | .extern z80Read8 |
| 125 | .extern OtherRead16 |
| 126 | .extern PicoVideoRead |
| 127 | .extern Read_CDC_Host |
| 128 | .extern m68k_reg_write8 |
| 129 | .extern OtherWrite8 |
| 130 | .extern OtherWrite16 |
| 131 | .extern gfx_cd_read |
| 132 | .extern s68k_reg_read16 |
| 133 | .extern SRam |
| 134 | .extern gfx_cd_write16 |
| 135 | .extern s68k_reg_write8 |
| 136 | .extern s68k_poll_adclk |
| 137 | .extern PicoCpuS68k |
| 138 | |
| 139 | |
| 140 | @ r0=reg3, r1-r3=temp |
| 141 | .macro mk_update_table on sz @ operation name, size |
| 142 | @ we only set word-ram handlers |
| 143 | ldr r1, =m_m68k_&\on&\sz&_table |
| 144 | ldr r12,=m_s68k_&\on&\sz&_table |
| 145 | tst r0, #4 |
| 146 | bne 0f @ pmr_8_1M |
| 147 | |
| 148 | @ pmr_8_2M: |
| 149 | ldr r2, =m_m68k_&\on&\sz&_wordram0_2M |
| 150 | ldr r3, =m_s68k_&\on&\sz&_wordram_2M |
| 151 | str r2, [r1, #16*4] |
| 152 | str r2, [r1, #17*4] |
| 153 | ldr r2, =m_&\on&_null |
| 154 | str r3, [r12,#4*4] |
| 155 | str r3, [r12,#5*4] |
| 156 | str r2, [r12,#6*4] |
| 157 | b 9f @ pmr_8_done |
| 158 | |
| 159 | 0: @ pmr_8_1M: |
| 160 | tst r0, #1 |
| 161 | bne 1f @ pmr_8_1M1 |
| 162 | |
| 163 | @ pmr_8_1M0: |
| 164 | ldr r2, =m_m68k_&\on&\sz&_wordram0_1M_b0 |
| 165 | ldr r3, =m_m68k_&\on&\sz&_wordram1_1M_b0 |
| 166 | str r2, [r1, #16*4] |
| 167 | str r3, [r1, #17*4] |
| 168 | ldr r3, =m_s68k_&\on&\sz&_wordram_1M_b1 |
| 169 | .ifeqs "\on", "read" |
| 170 | ldr r2, =m_s68k_&\on&\sz&_wordram_2M_decode_b1 |
| 171 | str r2, [r12,#4*4] |
| 172 | str r2, [r12,#5*4] |
| 173 | .endif |
| 174 | str r3, [r12,#6*4] |
| 175 | b 9f @ pmr_8_done |
| 176 | |
| 177 | 1: @ pmr_8_1M1: |
| 178 | ldr r2, =m_m68k_&\on&\sz&_wordram0_1M_b1 |
| 179 | ldr r3, =m_m68k_&\on&\sz&_wordram1_1M_b1 |
| 180 | str r2, [r1, #16*4] |
| 181 | str r3, [r1, #17*4] |
| 182 | ldr r3, =m_s68k_&\on&\sz&_wordram_1M_b0 |
| 183 | .ifeqs "\on", "read" |
| 184 | ldr r2, =m_s68k_&\on&\sz&_wordram_2M_decode_b0 |
| 185 | str r2, [r12,#4*4] |
| 186 | str r2, [r12,#5*4] |
| 187 | .endif |
| 188 | str r3, [r12,#6*4] |
| 189 | |
| 190 | 9: @ pmr_8_done: |
| 191 | .endm |
| 192 | |
| 193 | |
| 194 | PicoMemResetCD: @ r3 |
| 195 | mk_update_table read 8 |
| 196 | mk_update_table read 16 |
| 197 | mk_update_table read 32 |
| 198 | mk_update_table write 8 |
| 199 | mk_update_table write 16 |
| 200 | mk_update_table write 32 |
| 201 | bx lr |
| 202 | |
| 203 | |
| 204 | PicoMemResetCDdecode: @reg3 |
| 205 | tst r0, #4 |
| 206 | bxeq lr @ we should not be called in 2M mode |
| 207 | ldr r1, =m_s68k_write8_table |
| 208 | ldr r3, =m_s68k_decode_write_table |
| 209 | and r2, r0, #0x18 |
| 210 | mov r2, r2, lsr #3 |
| 211 | cmp r2, #3 |
| 212 | moveq r2, #2 @ mode3 is same as mode2? |
| 213 | tst r0, #1 |
| 214 | addeq r2, r2, #3 @ bank1 (r2=0..5) |
| 215 | add r2, r2, r2, lsl #1 @ *= 3 |
| 216 | add r2, r3, r2, lsl #2 |
| 217 | ldmia r2, {r0,r3,r12} |
| 218 | str r0, [r1, #4*4] |
| 219 | str r0, [r1, #5*4] |
| 220 | str r3, [r1, #4*4+8*4] |
| 221 | str r3, [r1, #5*4+8*4] |
| 222 | str r12,[r1, #4*4+8*4*2] |
| 223 | str r12,[r1, #5*4+8*4*2] |
| 224 | bx lr |
| 225 | |
| 226 | |
| 227 | .pool |
| 228 | |
| 229 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 230 | |
| 231 | .macro mk_entry_m68k table |
| 232 | ldr r2, =\table |
| 233 | bic r0, r0, #0xff000000 |
| 234 | and r3, r0, #0x00fe0000 |
| 235 | ldr pc, [r2, r3, lsr #15] |
| 236 | .endm |
| 237 | |
| 238 | PicoReadM68k8: @ u32 a |
| 239 | mk_entry_m68k m_m68k_read8_table |
| 240 | |
| 241 | PicoReadM68k16: @ u32 a |
| 242 | mk_entry_m68k m_m68k_read16_table |
| 243 | |
| 244 | PicoReadM68k32: @ u32 a |
| 245 | mk_entry_m68k m_m68k_read32_table |
| 246 | |
| 247 | PicoWriteM68k8: @ u32 a, u8 d |
| 248 | mk_entry_m68k m_m68k_write8_table |
| 249 | |
| 250 | PicoWriteM68k16: @ u32 a, u16 d |
| 251 | mk_entry_m68k m_m68k_write16_table |
| 252 | |
| 253 | PicoWriteM68k32: @ u32 a, u32 d |
| 254 | mk_entry_m68k m_m68k_write32_table |
| 255 | |
| 256 | |
| 257 | .macro mk_entry_s68k on sz |
| 258 | bic r0, r0, #0xff000000 |
| 259 | cmp r0, #0x00080000 |
| 260 | blt m_s68k_&\on&\sz&_prg |
| 261 | cmp r0, #0x000e0000 |
| 262 | ldrlt r2, =m_s68k_&\on&\sz&_table |
| 263 | andlt r3, r0, #0x000e0000 |
| 264 | ldrlt pc, [r2, r3, lsr #15] |
| 265 | mov r3, #0x00ff0000 |
| 266 | orr r3, r3, #0x00008000 |
| 267 | cmp r0, r3 |
| 268 | bge m_s68k_&\on&\sz&_regs |
| 269 | cmp r0, #0x00ff0000 |
| 270 | bge m_s68k_&\on&\sz&_pcm |
| 271 | cmp r0, #0x00fe0000 |
| 272 | bge m_s68k_&\on&\sz&_backup |
| 273 | mov r0, #0 |
| 274 | bx lr |
| 275 | .endm |
| 276 | |
| 277 | PicoReadS68k8: @ u32 a |
| 278 | mk_entry_s68k read 8 |
| 279 | |
| 280 | PicoReadS68k16: @ u32 a |
| 281 | mk_entry_s68k read 16 |
| 282 | |
| 283 | PicoReadS68k32: @ u32 a |
| 284 | mk_entry_s68k read 32 |
| 285 | |
| 286 | PicoWriteS68k8: @ u32 a, u8 d |
| 287 | mk_entry_s68k write 8 |
| 288 | |
| 289 | PicoWriteS68k16: @ u32 a, u16 d |
| 290 | mk_entry_s68k write 16 |
| 291 | |
| 292 | PicoWriteS68k32: @ u32 a, u32 d |
| 293 | mk_entry_s68k write 32 |
| 294 | |
| 295 | |
| 296 | .pool |
| 297 | |
| 298 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 299 | |
| 300 | @ utilities |
| 301 | |
| 302 | @ r0=addr[in,out], r1,r2=tmp |
| 303 | .macro cell_map |
| 304 | ands r1, r0, #0x01c000 |
| 305 | ldrne pc, [pc, r1, lsr #12] |
| 306 | beq 0f @ most common? |
| 307 | .long 0f |
| 308 | .long 0f |
| 309 | .long 0f |
| 310 | .long 0f |
| 311 | .long 1f |
| 312 | .long 1f |
| 313 | .long 2f |
| 314 | .long 3f |
| 315 | 1: @ x16 cells |
| 316 | and r1, r0, #0x7e00 @ col |
| 317 | and r2, r0, #0x01fc @ row |
| 318 | orr r2, r2, #0x0400 |
| 319 | orr r1, r2, r1, ror #13 |
| 320 | b 9f |
| 321 | 2: @ x8 cells |
| 322 | and r1, r0, #0x3f00 @ col |
| 323 | and r2, r0, #0x00fc @ row |
| 324 | orr r2, r2, #0x0600 |
| 325 | orr r1, r2, r1, ror #12 |
| 326 | b 9f |
| 327 | 3: @ x4 cells |
| 328 | and r1, r0, #0x1f80 @ col |
| 329 | and r2, r0, #0x007c @ row |
| 330 | orr r1, r2, r1, ror #11 |
| 331 | and r2, r0,#0x1e000 |
| 332 | orr r1, r1, r2, lsr #6 |
| 333 | b 9f |
| 334 | 0: @ x32 cells |
| 335 | and r1, r0, #0xfc00 @ col |
| 336 | and r2, r0, #0x03fc @ row |
| 337 | orr r1, r2, r1, ror #14 |
| 338 | 9: |
| 339 | and r0, r0, #3 |
| 340 | orr r0, r0, r1, ror #26 @ rol 4+2 |
| 341 | .endm |
| 342 | |
| 343 | |
| 344 | @ r0=prt1, r1=ptr2; unaligned ptr MUST be r0 |
| 345 | .macro m_read32_gen |
| 346 | tst r0, #2 |
| 347 | ldrneh r0, [r1, r0]! |
| 348 | ldrneh r1, [r1, #2] |
| 349 | ldreq r0, [r1, r0] |
| 350 | moveq r0, r0, ror #16 |
| 351 | orrne r0, r1, r0, lsl #16 |
| 352 | .endm |
| 353 | |
| 354 | |
| 355 | @ r0=prt1, r1=data, r2=ptr2; unaligned ptr MUST be r0 |
| 356 | .macro m_write32_gen |
| 357 | tst r0, #2 |
| 358 | mov r1, r1, ror #16 |
| 359 | strneh r1, [r2, r0]! |
| 360 | movne r1, r1, lsr #16 |
| 361 | strneh r1, [r2, #2] |
| 362 | streq r1, [r2, r0] |
| 363 | .endm |
| 364 | |
| 365 | |
| 366 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 367 | |
| 368 | |
| 369 | m_read_null: |
| 370 | mov r0, #0 |
| 371 | bx lr |
| 372 | |
| 373 | |
| 374 | m_m68k_read8_bios: |
| 375 | ldr r1, =(Pico+0x22200) |
| 376 | bic r0, r0, #0xfe0000 |
| 377 | ldr r1, [r1] |
| 378 | eor r0, r0, #1 |
| 379 | ldrb r0, [r1, r0] |
| 380 | bx lr |
| 381 | |
| 382 | |
| 383 | m_m68k_read8_prgbank: |
| 384 | ldr r1, =(Pico+0x22200) |
| 385 | eor r0, r0, #1 |
| 386 | ldr r1, [r1] |
| 387 | mov r2, #0x110000 |
| 388 | orr r3, r2, #0x002200 |
| 389 | ldr r3, [r1, r3] |
| 390 | ldr r2, [r1, r2] |
| 391 | tst r3, #0x00020000 @ have bus? |
| 392 | moveq r0, #0 |
| 393 | bxeq lr |
| 394 | and r2, r2, #0xc0000000 @ r3 & 0xC0 |
| 395 | add r1, r1, r2, lsr #12 |
| 396 | ldrb r0, [r1, r0] |
| 397 | bx lr |
| 398 | |
| 399 | |
| 400 | m_m68k_read8_wordram0_2M: @ 0x200000 - 0x21ffff |
| 401 | m_m68k_read8_wordram1_2M: @ 0x220000 - 0x23ffff |
| 402 | ldr r1, =(Pico+0x22200) |
| 403 | sub r0, r0, #0x160000 @ map to our offset, which is 0x0a0000 |
| 404 | ldr r1, [r1] |
| 405 | eor r0, r0, #1 |
| 406 | ldrb r0, [r1, r0] |
| 407 | bx lr |
| 408 | |
| 409 | |
| 410 | m_m68k_read8_wordram0_1M_b0: @ 0x200000 - 0x21ffff |
| 411 | ldr r1, =(Pico+0x22200) |
| 412 | sub r0, r0, #0x140000 @ map to our offset, which is 0x0c0000 |
| 413 | ldr r1, [r1] |
| 414 | eor r0, r0, #1 |
| 415 | ldrb r0, [r1, r0] |
| 416 | bx lr |
| 417 | |
| 418 | |
| 419 | m_m68k_read8_wordram0_1M_b1: @ 0x200000 - 0x21ffff |
| 420 | ldr r1, =(Pico+0x22200) |
| 421 | sub r0, r0, #0x120000 @ map to our offset, which is 0x0e0000 |
| 422 | ldr r1, [r1] |
| 423 | eor r0, r0, #1 |
| 424 | ldrb r0, [r1, r0] |
| 425 | bx lr |
| 426 | |
| 427 | |
| 428 | m_m68k_read8_wordram1_1M_b0: @ 0x220000 - 0x23ffff, cell arranged |
| 429 | cell_map |
| 430 | ldr r1, =(Pico+0x22200) |
| 431 | add r0, r0, #0x0c0000 |
| 432 | ldr r1, [r1] |
| 433 | eor r0, r0, #1 |
| 434 | ldrb r0, [r1, r0] |
| 435 | bx lr |
| 436 | |
| 437 | |
| 438 | m_m68k_read8_wordram1_1M_b1: @ 0x220000 - 0x23ffff, cell arranged |
| 439 | cell_map |
| 440 | ldr r1, =(Pico+0x22200) |
| 441 | add r0, r0, #0x0e0000 |
| 442 | ldr r1, [r1] |
| 443 | eor r0, r0, #1 |
| 444 | ldrb r0, [r1, r0] |
| 445 | bx lr |
| 446 | |
| 447 | |
| 448 | m_m68k_read8_system_io: |
| 449 | bic r2, r0, #0xfe0000 |
| 450 | bic r2, r2, #0x3f |
| 451 | cmp r2, #0x012000 |
| 452 | bne m_m68k_read8_misc |
| 453 | |
| 454 | ldr r1, =(Pico+0x22200) |
| 455 | and r0, r0, #0x3f |
| 456 | ldr r1, [r1] @ Pico.mcd (used everywhere) |
| 457 | cmp r0, #0x0e |
| 458 | ldrlt pc, [pc, r0, lsl #2] |
| 459 | b m_m68k_read8_hi |
| 460 | .long m_m68k_read8_r00 |
| 461 | .long m_m68k_read8_r01 |
| 462 | .long m_m68k_read8_r02 |
| 463 | .long m_m68k_read8_r03 |
| 464 | .long m_m68k_read8_r04 |
| 465 | .long m_read_null @ unused bits |
| 466 | .long m_m68k_read8_r06 |
| 467 | .long m_m68k_read8_r07 |
| 468 | .long m_m68k_read8_r08 |
| 469 | .long m_m68k_read8_r09 |
| 470 | .long m_read_null @ reserved |
| 471 | .long m_read_null |
| 472 | .long m_m68k_read8_r0c |
| 473 | .long m_m68k_read8_r0d |
| 474 | m_m68k_read8_r00: |
| 475 | add r1, r1, #0x110000 |
| 476 | ldr r0, [r1, #0x30] |
| 477 | and r0, r0, #0x04000000 @ we need irq2 mask state |
| 478 | mov r0, r0, lsr #19 |
| 479 | bx lr |
| 480 | m_m68k_read8_r01: |
| 481 | add r1, r1, #0x110000 |
| 482 | add r1, r1, #0x002200 |
| 483 | ldrb r0, [r1, #2] @ Pico_mcd->m.busreq |
| 484 | bx lr |
| 485 | m_m68k_read8_r02: |
| 486 | add r1, r1, #0x110000 |
| 487 | ldrb r0, [r1, #2] |
| 488 | bx lr |
| 489 | m_m68k_read8_r03: |
| 490 | add r1, r1, #0x110000 |
| 491 | ldrb r0, [r1, #3] |
| 492 | add r1, r1, #0x002200 |
| 493 | ldr r1, [r1, #4] |
| 494 | and r0, r0, #0xc7 |
| 495 | tst r1, #2 @ DMNA pending? |
| 496 | bxeq lr |
| 497 | bic r0, r0, #1 |
| 498 | orr r0, r0, #2 |
| 499 | bx lr |
| 500 | m_m68k_read8_r04: |
| 501 | add r1, r1, #0x110000 |
| 502 | ldrb r0, [r1, #4] |
| 503 | bx lr |
| 504 | m_m68k_read8_r06: |
| 505 | ldrb r0, [r1, #0x73] @ IRQ vector |
| 506 | bx lr |
| 507 | m_m68k_read8_r07: |
| 508 | ldrb r0, [r1, #0x72] |
| 509 | bx lr |
| 510 | m_m68k_read8_r08: |
| 511 | mov r0, #0 |
| 512 | bl Read_CDC_Host @ TODO: make it local |
| 513 | mov r0, r0, lsr #8 |
| 514 | bx lr |
| 515 | m_m68k_read8_r09: |
| 516 | mov r0, #0 |
| 517 | b Read_CDC_Host |
| 518 | m_m68k_read8_r0c: |
| 519 | add r1, r1, #0x110000 |
| 520 | add r1, r1, #0x002200 |
| 521 | ldr r0, [r1, #0x14] @ Pico_mcd->m.timer_stopwatch |
| 522 | mov r0, r0, lsr #24 |
| 523 | bx lr |
| 524 | m_m68k_read8_r0d: |
| 525 | add r1, r1, #0x110000 |
| 526 | add r1, r1, #0x002200 |
| 527 | ldr r0, [r1, #0x14] |
| 528 | mov r0, r0, lsr #16 |
| 529 | bx lr |
| 530 | m_m68k_read8_hi: |
| 531 | cmp r0, #0x30 |
| 532 | movge r0, #0 |
| 533 | bxeq lr |
| 534 | add r1, r1, #0x110000 |
| 535 | ldrb r0, [r1, r0] |
| 536 | bx lr |
| 537 | |
| 538 | |
| 539 | m_m68k_read8_misc: |
| 540 | bic r2, r0, #0x00ff |
| 541 | bic r2, r2, #0xbf00 |
| 542 | cmp r2, #0xa00000 @ Z80 RAM? |
| 543 | beq z80Read8 |
| 544 | @ ldreq r2, =z80Read8 |
| 545 | @ bxeq r2 |
| 546 | stmfd sp!,{r0,lr} |
| 547 | bic r0, r0, #1 |
| 548 | mov r1, #8 |
| 549 | bl OtherRead16 @ non-MCD version should be ok too |
| 550 | ldmfd sp!,{r1,lr} |
| 551 | tst r1, #1 |
| 552 | moveq r0, r0, lsr #8 |
| 553 | bx lr |
| 554 | |
| 555 | |
| 556 | m_m68k_read8_vdp: |
| 557 | tst r0, #0x70000 |
| 558 | tsteq r0, #0x000e0 |
| 559 | bxne lr @ invalid read |
| 560 | stmfd sp!,{r0,lr} |
| 561 | bic r0, r0, #1 |
| 562 | bl PicoVideoRead @ TODO: implement it in asm |
| 563 | ldmfd sp!,{r1,lr} |
| 564 | tst r1, #1 |
| 565 | moveq r0, r0, lsr #8 |
| 566 | bx lr |
| 567 | |
| 568 | |
| 569 | m_m68k_read8_ram: |
| 570 | ldr r1, =Pico |
| 571 | bic r0, r0, #0xff0000 |
| 572 | eor r0, r0, #1 |
| 573 | ldrb r0, [r1, r0] |
| 574 | bx lr |
| 575 | |
| 576 | |
| 577 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 578 | |
| 579 | |
| 580 | m_m68k_read16_bios: |
| 581 | ldr r1, =(Pico+0x22200) |
| 582 | bic r0, r0, #0xfe0000 |
| 583 | ldr r1, [r1] |
| 584 | bic r0, r0, #1 |
| 585 | ldrh r0, [r1, r0] |
| 586 | bx lr |
| 587 | |
| 588 | |
| 589 | m_m68k_read16_prgbank: |
| 590 | ldr r1, =(Pico+0x22200) |
| 591 | bic r0, r0, #1 |
| 592 | ldr r1, [r1] |
| 593 | mov r2, #0x110000 |
| 594 | orr r3, r2, #0x002200 |
| 595 | ldr r3, [r1, r3] |
| 596 | ldr r2, [r1, r2] |
| 597 | tst r3, #0x00020000 @ have bus? |
| 598 | moveq r0, #0 |
| 599 | bxeq lr |
| 600 | and r2, r2, #0xc0000000 @ r3 & 0xC0 |
| 601 | add r1, r1, r2, lsr #12 |
| 602 | ldrh r0, [r1, r0] |
| 603 | bx lr |
| 604 | |
| 605 | |
| 606 | m_m68k_read16_wordram0_2M: @ 0x200000 - 0x21ffff |
| 607 | m_m68k_read16_wordram1_2M: @ 0x220000 - 0x23ffff |
| 608 | ldr r1, =(Pico+0x22200) |
| 609 | sub r0, r0, #0x160000 @ map to our offset, which is 0x0a0000 |
| 610 | ldr r1, [r1] |
| 611 | bic r0, r0, #1 |
| 612 | ldrh r0, [r1, r0] |
| 613 | bx lr |
| 614 | |
| 615 | |
| 616 | m_m68k_read16_wordram0_1M_b0: @ 0x200000 - 0x21ffff |
| 617 | ldr r1, =(Pico+0x22200) |
| 618 | sub r0, r0, #0x140000 @ map to our offset, which is 0x0c0000 |
| 619 | ldr r1, [r1] |
| 620 | bic r0, r0, #1 |
| 621 | ldrh r0, [r1, r0] |
| 622 | bx lr |
| 623 | |
| 624 | |
| 625 | m_m68k_read16_wordram0_1M_b1: @ 0x200000 - 0x21ffff |
| 626 | ldr r1, =(Pico+0x22200) |
| 627 | sub r0, r0, #0x120000 @ map to our offset, which is 0x0e0000 |
| 628 | ldr r1, [r1] |
| 629 | bic r0, r0, #1 |
| 630 | ldrh r0, [r1, r0] |
| 631 | bx lr |
| 632 | |
| 633 | |
| 634 | m_m68k_read16_wordram1_1M_b0: @ 0x220000 - 0x23ffff, cell arranged |
| 635 | @ Warning: read32 relies on NOT using r3 and r12 here |
| 636 | cell_map |
| 637 | ldr r1, =(Pico+0x22200) |
| 638 | add r0, r0, #0x0c0000 |
| 639 | ldr r1, [r1] |
| 640 | bic r0, r0, #1 |
| 641 | ldrh r0, [r1, r0] |
| 642 | bx lr |
| 643 | |
| 644 | |
| 645 | m_m68k_read16_wordram1_1M_b1: @ 0x220000 - 0x23ffff, cell arranged |
| 646 | cell_map |
| 647 | ldr r1, =(Pico+0x22200) |
| 648 | add r0, r0, #0x0e0000 |
| 649 | ldr r1, [r1] |
| 650 | bic r0, r0, #1 |
| 651 | ldrh r0, [r1, r0] |
| 652 | bx lr |
| 653 | |
| 654 | |
| 655 | m_m68k_read16_system_io: |
| 656 | bic r1, r0, #0xfe0000 |
| 657 | bic r1, r1, #0x3f |
| 658 | cmp r1, #0x012000 |
| 659 | bne m_m68k_read16_misc |
| 660 | |
| 661 | m_m68k_read16_m68k_regs: |
| 662 | ldr r1, =(Pico+0x22200) |
| 663 | and r0, r0, #0x3e |
| 664 | ldr r1, [r1] @ Pico.mcd (used everywhere) |
| 665 | cmp r0, #0x0e |
| 666 | ldrlt pc, [pc, r0, lsl #1] |
| 667 | b m_m68k_read16_hi |
| 668 | .long m_m68k_read16_r00 |
| 669 | .long m_m68k_read16_r02 |
| 670 | .long m_m68k_read16_r04 |
| 671 | .long m_m68k_read16_r06 |
| 672 | .long m_m68k_read16_r08 |
| 673 | .long m_read_null @ reserved |
| 674 | .long m_m68k_read16_r0c |
| 675 | m_m68k_read16_r00: |
| 676 | add r1, r1, #0x110000 |
| 677 | ldr r0, [r1, #0x30] |
| 678 | add r1, r1, #0x002200 |
| 679 | ldrb r1, [r1, #2] @ Pico_mcd->m.busreq |
| 680 | and r0, r0, #0x04000000 @ we need irq2 mask state |
| 681 | orr r0, r1, r0, lsr #11 |
| 682 | bx lr |
| 683 | m_m68k_read16_r02: |
| 684 | add r1, r1, #0x110000 |
| 685 | ldrb r0, [r1, #2] |
| 686 | ldrb r2, [r1, #3] |
| 687 | add r1, r1, #0x002200 |
| 688 | ldr r1, [r1, #4] |
| 689 | and r2, r2, #0xc7 |
| 690 | orr r0, r2, r0, lsl #8 |
| 691 | tst r1, #2 @ DMNA pending? |
| 692 | bxeq lr |
| 693 | bic r0, r0, #1 |
| 694 | orr r0, r0, #2 |
| 695 | bx lr |
| 696 | m_m68k_read16_r04: |
| 697 | add r1, r1, #0x110000 |
| 698 | ldrb r0, [r1, #4] |
| 699 | mov r0, r0, lsl #8 |
| 700 | bx lr |
| 701 | m_m68k_read16_r06: |
| 702 | ldrh r0, [r1, #0x72] @ IRQ vector |
| 703 | bx lr |
| 704 | m_m68k_read16_r08: |
| 705 | mov r0, #0 |
| 706 | b Read_CDC_Host |
| 707 | m_m68k_read16_r0c: |
| 708 | add r1, r1, #0x110000 |
| 709 | add r1, r1, #0x002200 |
| 710 | ldr r0, [r1, #0x14] |
| 711 | mov r0, r0, lsr #16 |
| 712 | bx lr |
| 713 | m_m68k_read16_hi: |
| 714 | cmp r0, #0x30 |
| 715 | addlt r1, r1, #0x110000 |
| 716 | ldrlth r1, [r1, r0] |
| 717 | movge r0, #0 |
| 718 | bxge lr |
| 719 | mov r0, r1, lsr #8 |
| 720 | and r1, r1, #0xff |
| 721 | orr r0, r0, r1, lsl #8 |
| 722 | bx lr |
| 723 | |
| 724 | |
| 725 | m_m68k_read16_misc: |
| 726 | bic r0, r0, #1 |
| 727 | mov r1, #16 |
| 728 | b OtherRead16 |
| 729 | |
| 730 | |
| 731 | m_m68k_read16_vdp: |
| 732 | tst r0, #0x70000 |
| 733 | tsteq r0, #0x000e0 |
| 734 | bxne lr @ invalid read |
| 735 | bic r0, r0, #1 |
| 736 | b PicoVideoRead |
| 737 | |
| 738 | |
| 739 | m_m68k_read16_ram: |
| 740 | ldr r1, =Pico |
| 741 | bic r0, r0, #0xff0000 |
| 742 | bic r0, r0, #1 |
| 743 | ldrh r0, [r1, r0] |
| 744 | bx lr |
| 745 | |
| 746 | |
| 747 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 748 | |
| 749 | |
| 750 | m_m68k_read32_bios: |
| 751 | ldr r1, =(Pico+0x22200) |
| 752 | bic r0, r0, #0xfe0000 |
| 753 | ldr r1, [r1] |
| 754 | bic r0, r0, #1 |
| 755 | m_read32_gen |
| 756 | bx lr |
| 757 | |
| 758 | |
| 759 | m_m68k_read32_prgbank: |
| 760 | ldr r1, =(Pico+0x22200) |
| 761 | bic r0, r0, #1 |
| 762 | ldr r1, [r1] |
| 763 | mov r2, #0x110000 |
| 764 | orr r3, r2, #0x002200 |
| 765 | ldr r3, [r1, r3] |
| 766 | ldr r2, [r1, r2] |
| 767 | tst r3, #0x00020000 @ have bus? |
| 768 | moveq r0, #0 |
| 769 | bxeq lr |
| 770 | and r2, r2, #0xc0000000 @ r3 & 0xC0 |
| 771 | add r1, r1, r2, lsr #12 |
| 772 | m_read32_gen |
| 773 | bx lr |
| 774 | |
| 775 | |
| 776 | m_m68k_read32_wordram0_2M: @ 0x200000 - 0x21ffff |
| 777 | m_m68k_read32_wordram1_2M: @ 0x220000 - 0x23ffff |
| 778 | ldr r1, =(Pico+0x22200) |
| 779 | sub r0, r0, #0x160000 @ map to our offset, which is 0x0a0000 |
| 780 | ldr r1, [r1] |
| 781 | bic r0, r0, #1 |
| 782 | m_read32_gen |
| 783 | bx lr |
| 784 | |
| 785 | |
| 786 | m_m68k_read32_wordram0_1M_b0: @ 0x200000 - 0x21ffff |
| 787 | ldr r1, =(Pico+0x22200) |
| 788 | sub r0, r0, #0x140000 @ map to our offset, which is 0x0c0000 |
| 789 | ldr r1, [r1] |
| 790 | bic r0, r0, #1 |
| 791 | m_read32_gen |
| 792 | bx lr |
| 793 | |
| 794 | |
| 795 | m_m68k_read32_wordram0_1M_b1: @ 0x200000 - 0x21ffff |
| 796 | ldr r1, =(Pico+0x22200) |
| 797 | sub r0, r0, #0x120000 @ map to our offset, which is 0x0e0000 |
| 798 | ldr r1, [r1] |
| 799 | bic r0, r0, #1 |
| 800 | m_read32_gen |
| 801 | bx lr |
| 802 | |
| 803 | |
| 804 | m_m68k_read32_wordram1_1M_b0: @ 0x220000 - 0x23ffff, cell arranged |
| 805 | tst r0, #2 |
| 806 | bne m_m68k_read32_wordram1_1M_b0_unal |
| 807 | cell_map |
| 808 | ldr r1, =(Pico+0x22200) |
| 809 | add r0, r0, #0x0c0000 |
| 810 | ldr r1, [r1] |
| 811 | bic r0, r0, #1 |
| 812 | m_read32_gen |
| 813 | bx lr |
| 814 | m_m68k_read32_wordram1_1M_b0_unal: |
| 815 | @ hopefully this doesn't happen too often |
| 816 | mov r12,lr |
| 817 | mov r3, r0 |
| 818 | bl m_m68k_read16_wordram1_1M_b0 @ must not trash r12 and r3 |
| 819 | add r1, r3, #2 |
| 820 | mov r3, r0 |
| 821 | mov r0, r1 |
| 822 | bl m_m68k_read16_wordram1_1M_b0 |
| 823 | orr r0, r0, r3, lsl #16 |
| 824 | bx r12 |
| 825 | |
| 826 | |
| 827 | m_m68k_read32_wordram1_1M_b1: @ 0x220000 - 0x23ffff, cell arranged |
| 828 | tst r0, #2 |
| 829 | bne m_m68k_read32_wordram1_1M_b1_unal |
| 830 | cell_map |
| 831 | ldr r1, =(Pico+0x22200) |
| 832 | add r0, r0, #0x0e0000 |
| 833 | ldr r1, [r1] |
| 834 | bic r0, r0, #1 |
| 835 | m_read32_gen |
| 836 | bx lr |
| 837 | m_m68k_read32_wordram1_1M_b1_unal: |
| 838 | mov r12,lr |
| 839 | mov r3, r0 |
| 840 | bl m_m68k_read16_wordram1_1M_b1 @ must not trash r12 and r3 |
| 841 | add r1, r3, #2 |
| 842 | mov r3, r0 |
| 843 | mov r0, r1 |
| 844 | bl m_m68k_read16_wordram1_1M_b1 |
| 845 | orr r0, r0, r3, lsl #16 |
| 846 | bx r12 |
| 847 | |
| 848 | |
| 849 | @ it is not very practical to use long access on hw registers, so I assume it is not used too much. |
| 850 | m_m68k_read32_system_io: |
| 851 | bic r1, r0, #0xfe0000 |
| 852 | bic r1, r1, #0x3f |
| 853 | cmp r1, #0x012000 |
| 854 | bne m_m68k_read32_misc |
| 855 | and r1, r0, #0x3e |
| 856 | cmp r1, #0x0e |
| 857 | blt m_m68k_read32_misc |
| 858 | cmp r1, #0x30 |
| 859 | movge r0, #0 |
| 860 | bxge lr |
| 861 | @ I have seen the range 0x0e-0x2f accessed quite frequently with long i/o, so here is some code for that |
| 862 | mov r0, r1 |
| 863 | ldr r1, =(Pico+0x22200) |
| 864 | mov r2, #0xff |
| 865 | ldr r1, [r1] |
| 866 | orr r2, r2, r2, lsl #16 |
| 867 | add r1, r1, #0x110000 |
| 868 | m_read32_gen |
| 869 | and r1, r2, r0 @ data is big-endian read as little, have to byteswap |
| 870 | and r0, r2, r0, lsr #8 |
| 871 | orr r0, r0, r1, lsl #8 |
| 872 | bx lr |
| 873 | |
| 874 | m_m68k_read32_misc: |
| 875 | add r1, r0, #2 |
| 876 | stmfd sp!,{r1,lr} |
| 877 | bl m_m68k_read16_system_io |
| 878 | swp r0, r0, [sp] |
| 879 | bl m_m68k_read16_system_io |
| 880 | ldmfd sp!,{r1,lr} |
| 881 | orr r0, r0, r1, lsl #16 |
| 882 | bx lr |
| 883 | |
| 884 | |
| 885 | m_m68k_read32_vdp: |
| 886 | tst r0, #0x70000 |
| 887 | tsteq r0, #0x000e0 |
| 888 | bxne lr @ invalid read |
| 889 | bic r0, r0, #1 |
| 890 | add r1, r0, #2 |
| 891 | stmfd sp!,{r1,lr} |
| 892 | bl PicoVideoRead |
| 893 | swp r0, r0, [sp] |
| 894 | bl PicoVideoRead |
| 895 | ldmfd sp!,{r1,lr} |
| 896 | orr r0, r0, r1, lsl #16 |
| 897 | bx lr |
| 898 | |
| 899 | |
| 900 | m_m68k_read32_ram: |
| 901 | ldr r1, =Pico |
| 902 | bic r0, r0, #0xff0000 |
| 903 | bic r0, r0, #1 |
| 904 | m_read32_gen |
| 905 | bx lr |
| 906 | |
| 907 | .pool |
| 908 | |
| 909 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 910 | |
| 911 | |
| 912 | m_write_null: |
| 913 | m_m68k_write8_bios: |
| 914 | bx lr |
| 915 | |
| 916 | |
| 917 | m_m68k_write8_prgbank: |
| 918 | ldr r2, =(Pico+0x22200) |
| 919 | eor r0, r0, #1 |
| 920 | ldr r2, [r2] |
| 921 | mov r12,#0x110000 |
| 922 | orr r3, r12, #0x002200 |
| 923 | ldr r3, [r2, r3] |
| 924 | ldr r12,[r2, r12] |
| 925 | tst r3, #0x00020000 @ have bus? |
| 926 | bxeq lr |
| 927 | and r12,r12,#0xc0000000 @ r3 & 0xC0 |
| 928 | add r2, r2, r12, lsr #12 |
| 929 | strb r1, [r2, r0] |
| 930 | bx lr |
| 931 | |
| 932 | |
| 933 | m_m68k_write8_wordram0_2M: @ 0x200000 - 0x21ffff |
| 934 | m_m68k_write8_wordram1_2M: @ 0x220000 - 0x23ffff |
| 935 | ldr r2, =(Pico+0x22200) |
| 936 | sub r0, r0, #0x160000 @ map to our offset, which is 0x0a0000 |
| 937 | ldr r2, [r2] |
| 938 | eor r0, r0, #1 |
| 939 | strb r1, [r2, r0] |
| 940 | bx lr |
| 941 | |
| 942 | |
| 943 | m_m68k_write8_wordram0_1M_b0: @ 0x200000 - 0x21ffff |
| 944 | ldr r2, =(Pico+0x22200) |
| 945 | sub r0, r0, #0x140000 @ map to our offset, which is 0x0c0000 |
| 946 | ldr r2, [r2] |
| 947 | eor r0, r0, #1 |
| 948 | strb r1, [r2, r0] |
| 949 | bx lr |
| 950 | |
| 951 | |
| 952 | m_m68k_write8_wordram0_1M_b1: @ 0x200000 - 0x21ffff |
| 953 | ldr r2, =(Pico+0x22200) |
| 954 | sub r0, r0, #0x120000 @ map to our offset, which is 0x0e0000 |
| 955 | ldr r2, [r2] |
| 956 | eor r0, r0, #1 |
| 957 | strb r1, [r2, r0] |
| 958 | bx lr |
| 959 | |
| 960 | |
| 961 | m_m68k_write8_wordram1_1M_b0: @ 0x220000 - 0x23ffff, cell arranged |
| 962 | mov r3, r1 |
| 963 | cell_map |
| 964 | ldr r2, =(Pico+0x22200) |
| 965 | add r0, r0, #0x0c0000 |
| 966 | ldr r2, [r2] |
| 967 | eor r0, r0, #1 |
| 968 | strb r3, [r2, r0] |
| 969 | bx lr |
| 970 | |
| 971 | |
| 972 | m_m68k_write8_wordram1_1M_b1: @ 0x220000 - 0x23ffff, cell arranged |
| 973 | mov r3, r1 |
| 974 | cell_map |
| 975 | ldr r2, =(Pico+0x22200) |
| 976 | add r0, r0, #0x0e0000 |
| 977 | ldr r2, [r2] |
| 978 | eor r0, r0, #1 |
| 979 | strb r3, [r2, r0] |
| 980 | bx lr |
| 981 | |
| 982 | |
| 983 | m_m68k_write8_system_io: |
| 984 | bic r2, r0, #0xfe0000 |
| 985 | bic r2, r2, #0x3f |
| 986 | cmp r2, #0x012000 |
| 987 | beq m68k_reg_write8 |
| 988 | mov r2, #8 |
| 989 | b OtherWrite8 |
| 990 | |
| 991 | |
| 992 | m_m68k_write8_vdp: |
| 993 | tst r0, #0x70000 |
| 994 | tsteq r0, #0x000e0 |
| 995 | bxne lr @ invalid |
| 996 | and r1, r1, #0xff |
| 997 | orr r1, r1, r1, lsl #8 @ byte access gets mirrored |
| 998 | b PicoVideoWrite |
| 999 | |
| 1000 | |
| 1001 | m_m68k_write8_ram: |
| 1002 | ldr r2, =Pico |
| 1003 | bic r0, r0, #0xff0000 |
| 1004 | eor r0, r0, #1 |
| 1005 | strb r1, [r2, r0] |
| 1006 | bx lr |
| 1007 | |
| 1008 | |
| 1009 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 1010 | |
| 1011 | |
| 1012 | m_m68k_write16_bios: |
| 1013 | bx lr |
| 1014 | |
| 1015 | |
| 1016 | m_m68k_write16_prgbank: |
| 1017 | ldr r2, =(Pico+0x22200) |
| 1018 | bic r0, r0, #1 |
| 1019 | ldr r2, [r2] |
| 1020 | mov r12,#0x110000 |
| 1021 | orr r3, r12, #0x002200 |
| 1022 | ldr r3, [r2, r3] |
| 1023 | ldr r12,[r2, r12] |
| 1024 | tst r3, #0x00020000 @ have bus? |
| 1025 | bxeq lr |
| 1026 | and r12,r12,#0xc0000000 @ r3 & 0xC0 |
| 1027 | add r2, r2, r12, lsr #12 |
| 1028 | strh r1, [r2, r0] |
| 1029 | bx lr |
| 1030 | |
| 1031 | |
| 1032 | m_m68k_write16_wordram0_2M: @ 0x200000 - 0x21ffff |
| 1033 | m_m68k_write16_wordram1_2M: @ 0x220000 - 0x23ffff |
| 1034 | ldr r2, =(Pico+0x22200) |
| 1035 | sub r0, r0, #0x160000 @ map to our offset, which is 0x0a0000 |
| 1036 | ldr r2, [r2] |
| 1037 | bic r0, r0, #1 |
| 1038 | strh r1, [r2, r0] |
| 1039 | bx lr |
| 1040 | |
| 1041 | |
| 1042 | m_m68k_write16_wordram0_1M_b0: @ 0x200000 - 0x21ffff |
| 1043 | ldr r2, =(Pico+0x22200) |
| 1044 | sub r0, r0, #0x140000 @ map to our offset, which is 0x0c0000 |
| 1045 | ldr r2, [r2] |
| 1046 | bic r0, r0, #1 |
| 1047 | strh r1, [r2, r0] |
| 1048 | bx lr |
| 1049 | |
| 1050 | |
| 1051 | m_m68k_write16_wordram0_1M_b1: @ 0x200000 - 0x21ffff |
| 1052 | ldr r2, =(Pico+0x22200) |
| 1053 | sub r0, r0, #0x120000 @ map to our offset, which is 0x0e0000 |
| 1054 | ldr r2, [r2] |
| 1055 | bic r0, r0, #1 |
| 1056 | strh r1, [r2, r0] |
| 1057 | bx lr |
| 1058 | |
| 1059 | |
| 1060 | m_m68k_write16_wordram1_1M_b0: @ 0x220000 - 0x23ffff, cell arranged |
| 1061 | @ Warning: write32 relies on NOT using r12 and and keeping data in r3 |
| 1062 | mov r3, r1 |
| 1063 | cell_map |
| 1064 | ldr r1, =(Pico+0x22200) |
| 1065 | add r0, r0, #0x0c0000 |
| 1066 | ldr r1, [r1] |
| 1067 | bic r0, r0, #1 |
| 1068 | strh r3, [r1, r0] |
| 1069 | bx lr |
| 1070 | |
| 1071 | |
| 1072 | m_m68k_write16_wordram1_1M_b1: @ 0x220000 - 0x23ffff, cell arranged |
| 1073 | mov r3, r1 |
| 1074 | cell_map |
| 1075 | ldr r1, =(Pico+0x22200) |
| 1076 | add r0, r0, #0x0e0000 |
| 1077 | ldr r1, [r1] |
| 1078 | bic r0, r0, #1 |
| 1079 | strh r3, [r1, r0] |
| 1080 | bx lr |
| 1081 | |
| 1082 | |
| 1083 | m_m68k_write16_system_io: |
| 1084 | bic r0, r0, #1 |
| 1085 | bic r2, r0, #0xfe0000 |
| 1086 | bic r2, r2, #0x3f |
| 1087 | cmp r2, #0x012000 |
| 1088 | bne OtherWrite16 |
| 1089 | |
| 1090 | m_m68k_write16_m68k_regs: |
| 1091 | and r0, r0, #0x3e |
| 1092 | cmp r0, #0x0e |
| 1093 | beq m_m68k_write16_regs_spec |
| 1094 | and r3, r1, #0xff |
| 1095 | add r2, r0, #1 |
| 1096 | stmfd sp!,{r2,r3,lr} |
| 1097 | mov r1, r1, lsr #8 |
| 1098 | bl m68k_reg_write8 |
| 1099 | ldmfd sp!,{r0,r1,lr} |
| 1100 | b m68k_reg_write8 |
| 1101 | |
| 1102 | m_m68k_write16_regs_spec: @ special case |
| 1103 | ldr r2, =(Pico+0x22200) |
| 1104 | ldr r3, =s68k_poll_adclk |
| 1105 | mov r0, #0x110000 |
| 1106 | ldr r2, [r2] |
| 1107 | add r0, r0, #0x00000e |
| 1108 | mov r1, r1, lsr #8 |
| 1109 | strb r1, [r2, r0] @ if (a == 0xe) s68k_regs[0x0e] = d >> 8; |
| 1110 | ldr r2, [r3] |
| 1111 | mov r1, #0 |
| 1112 | and r2, r2, #0xfe |
| 1113 | cmp r2, #0x0e |
| 1114 | bxne lr |
| 1115 | ldr r0, =PicoCpuS68k |
| 1116 | str r1, [r0, #0x58] @ push s68k out of stopped state |
| 1117 | str r1, [r3] |
| 1118 | bx lr |
| 1119 | |
| 1120 | |
| 1121 | m_m68k_write16_vdp: |
| 1122 | tst r0, #0x70000 |
| 1123 | tsteq r0, #0x000e0 |
| 1124 | bxne lr @ invalid |
| 1125 | bic r0, r0, #1 |
| 1126 | b PicoVideoWrite |
| 1127 | |
| 1128 | |
| 1129 | m_m68k_write16_ram: |
| 1130 | ldr r2, =Pico |
| 1131 | bic r0, r0, #0xff0000 |
| 1132 | bic r0, r0, #1 |
| 1133 | strh r1, [r2, r0] |
| 1134 | bx lr |
| 1135 | |
| 1136 | |
| 1137 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 1138 | |
| 1139 | |
| 1140 | m_m68k_write32_bios: |
| 1141 | bx lr |
| 1142 | |
| 1143 | |
| 1144 | m_m68k_write32_prgbank: |
| 1145 | ldr r2, =(Pico+0x22200) |
| 1146 | bic r0, r0, #1 |
| 1147 | ldr r2, [r2] |
| 1148 | mov r12,#0x110000 |
| 1149 | orr r3, r12, #0x002200 |
| 1150 | ldr r3, [r2, r3] |
| 1151 | ldr r12,[r2, r12] |
| 1152 | tst r3, #0x00020000 @ have bus? |
| 1153 | bxeq lr |
| 1154 | and r12,r12,#0xc0000000 @ r3 & 0xC0 |
| 1155 | add r2, r2, r12, lsr #12 |
| 1156 | m_write32_gen |
| 1157 | bx lr |
| 1158 | |
| 1159 | |
| 1160 | m_m68k_write32_wordram0_2M: @ 0x200000 - 0x21ffff |
| 1161 | m_m68k_write32_wordram1_2M: @ 0x220000 - 0x23ffff |
| 1162 | ldr r2, =(Pico+0x22200) |
| 1163 | sub r0, r0, #0x160000 @ map to our offset, which is 0x0a0000 |
| 1164 | ldr r2, [r2] |
| 1165 | bic r0, r0, #1 |
| 1166 | m_write32_gen |
| 1167 | bx lr |
| 1168 | |
| 1169 | |
| 1170 | m_m68k_write32_wordram0_1M_b0: @ 0x200000 - 0x21ffff |
| 1171 | ldr r2, =(Pico+0x22200) |
| 1172 | sub r0, r0, #0x140000 @ map to our offset, which is 0x0c0000 |
| 1173 | ldr r2, [r2] |
| 1174 | bic r0, r0, #1 |
| 1175 | m_write32_gen |
| 1176 | bx lr |
| 1177 | |
| 1178 | |
| 1179 | m_m68k_write32_wordram0_1M_b1: @ 0x200000 - 0x21ffff |
| 1180 | ldr r2, =(Pico+0x22200) |
| 1181 | sub r0, r0, #0x120000 @ map to our offset, which is 0x0e0000 |
| 1182 | ldr r2, [r2] |
| 1183 | bic r0, r0, #1 |
| 1184 | m_write32_gen |
| 1185 | bx lr |
| 1186 | |
| 1187 | |
| 1188 | m_m68k_write32_wordram1_1M_b0: @ 0x220000 - 0x23ffff, cell arranged |
| 1189 | tst r0, #2 |
| 1190 | bne m_m68k_write32_wordram1_1M_b0_unal |
| 1191 | mov r3, r1 |
| 1192 | cell_map |
| 1193 | ldr r2, =(Pico+0x22200) |
| 1194 | add r0, r0, #0x0c0000 |
| 1195 | ldr r2, [r2] |
| 1196 | bic r0, r0, #1 |
| 1197 | mov r1, r3 |
| 1198 | m_write32_gen |
| 1199 | bx lr |
| 1200 | m_m68k_write32_wordram1_1M_b0_unal: |
| 1201 | @ hopefully this doesn't happen too often |
| 1202 | add r12,r0, #2 |
| 1203 | mov r1, r1, ror #16 |
| 1204 | stmfd sp!,{lr} |
| 1205 | bl m_m68k_write16_wordram1_1M_b0 @ must not trash r12 and keep data in r3 |
| 1206 | ldmfd sp!,{lr} |
| 1207 | mov r0, r12 |
| 1208 | mov r1, r3, lsr #16 |
| 1209 | b m_m68k_write16_wordram1_1M_b0 |
| 1210 | |
| 1211 | |
| 1212 | m_m68k_write32_wordram1_1M_b1: @ 0x220000 - 0x23ffff, cell arranged |
| 1213 | tst r0, #2 |
| 1214 | bne m_m68k_write32_wordram1_1M_b1_unal |
| 1215 | mov r3, r1 |
| 1216 | cell_map |
| 1217 | ldr r2, =(Pico+0x22200) |
| 1218 | add r0, r0, #0x0e0000 |
| 1219 | ldr r2, [r2] |
| 1220 | bic r0, r0, #1 |
| 1221 | mov r1, r3 |
| 1222 | m_write32_gen |
| 1223 | bx lr |
| 1224 | m_m68k_write32_wordram1_1M_b1_unal: |
| 1225 | add r12,r0, #2 |
| 1226 | mov r1, r1, ror #16 |
| 1227 | stmfd sp!,{lr} |
| 1228 | bl m_m68k_write16_wordram1_1M_b1 @ same as above |
| 1229 | ldmfd sp!,{lr} |
| 1230 | mov r0, r12 |
| 1231 | mov r1, r3, lsr #16 |
| 1232 | b m_m68k_write16_wordram1_1M_b1 |
| 1233 | |
| 1234 | |
| 1235 | @ it is not very practical to use long access on hw registers, so I assume it is not used too much. |
| 1236 | m_m68k_write32_system_io: |
| 1237 | bic r2, r0, #0xfe0000 |
| 1238 | bic r2, r2, #0x3f |
| 1239 | cmp r2, #0x012000 |
| 1240 | bne m_m68k_write32_misc |
| 1241 | and r2, r0, #0x3e |
| 1242 | cmp r2, #0x10 |
| 1243 | blt m_m68k_write32_regs |
| 1244 | cmp r2, #0x20 |
| 1245 | bxge lr |
| 1246 | @ Handle the 0x10-0x1f range |
| 1247 | ldr r0, =(Pico+0x22200) |
| 1248 | mov r3, #0xff |
| 1249 | ldr r0, [r0] |
| 1250 | orr r3, r3, r3, lsl #16 |
| 1251 | add r0, r0, #0x110000 |
| 1252 | and r12,r3, r1, ror #16 @ data is big-endian to be written as little, have to byteswap |
| 1253 | and r1, r3, r1, ror #24 |
| 1254 | orr r1, r1, r12,lsl #8 @ end of byteswap |
| 1255 | strh r1, [r2, r0]! |
| 1256 | cmp r2, #0x1e |
| 1257 | movne r1, r1, lsr #16 |
| 1258 | strneh r1, [r2, #2] |
| 1259 | bx lr |
| 1260 | |
| 1261 | m_m68k_write32_regs: |
| 1262 | bic r0, r0, #1 |
| 1263 | stmfd sp!,{r0,r1,lr} |
| 1264 | mov r1, r1, lsr #24 |
| 1265 | bl m68k_reg_write8 |
| 1266 | ldr r0, [sp] |
| 1267 | ldr r1, [sp, #4] |
| 1268 | add r0, r0, #1 |
| 1269 | mov r1, r1, lsr #16 |
| 1270 | bl m68k_reg_write8 |
| 1271 | ldr r0, [sp] |
| 1272 | ldr r1, [sp, #4] |
| 1273 | add r0, r0, #2 |
| 1274 | mov r1, r1, lsr #8 |
| 1275 | bl m68k_reg_write8 |
| 1276 | ldmfd sp!,{r0,r1,lr} |
| 1277 | add r0, r0, #3 |
| 1278 | b m68k_reg_write8 |
| 1279 | |
| 1280 | m_m68k_write32_misc: |
| 1281 | bic r0, r0, #1 |
| 1282 | stmfd sp!,{r0,r1,lr} |
| 1283 | mov r1, r1, lsr #16 |
| 1284 | bl OtherWrite16 |
| 1285 | ldmfd sp!,{r0,r1,lr} |
| 1286 | add r0, r0, #2 |
| 1287 | b OtherWrite16 |
| 1288 | |
| 1289 | |
| 1290 | m_m68k_write32_vdp: |
| 1291 | tst r0, #0x70000 |
| 1292 | tsteq r0, #0x000e0 |
| 1293 | bxne lr @ invalid |
| 1294 | stmfd sp!,{r0,r1,lr} |
| 1295 | mov r1, r1, lsr #16 |
| 1296 | bl PicoVideoWrite |
| 1297 | ldmfd sp!,{r0,r1,lr} |
| 1298 | add r0, r0, #2 |
| 1299 | b PicoVideoWrite |
| 1300 | |
| 1301 | |
| 1302 | m_m68k_write32_ram: |
| 1303 | ldr r2, =Pico |
| 1304 | bic r0, r0, #0xff0000 |
| 1305 | bic r0, r0, #1 |
| 1306 | m_write32_gen |
| 1307 | bx lr |
| 1308 | |
| 1309 | .pool |
| 1310 | |
| 1311 | |
| 1312 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 1313 | |
| 1314 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 1315 | |
| 1316 | |
| 1317 | .macro m_s68k_read8_ram map_addr |
| 1318 | ldr r1, =(Pico+0x22200) |
| 1319 | eor r0, r0, #1 |
| 1320 | ldr r1, [r1] |
| 1321 | .if \map_addr |
| 1322 | add r0, r0, #\map_addr @ map to our address |
| 1323 | .endif |
| 1324 | ldrb r0, [r1, r0] |
| 1325 | bx lr |
| 1326 | .endm |
| 1327 | |
| 1328 | .macro m_s68k_read8_wordram_2M_decode map_addr |
| 1329 | ldr r2, =(Pico+0x22200) |
| 1330 | eor r0, r0, #2 |
| 1331 | ldr r2, [r2] |
| 1332 | movs r0, r0, lsr #1 @ +4-6 <<16 |
| 1333 | add r2, r2, #\map_addr @ map to our address |
| 1334 | ldrb r0, [r2, r0] |
| 1335 | movcc r0, r0, lsr #4 |
| 1336 | andcs r0, r0, #0xf |
| 1337 | bx lr |
| 1338 | .endm |
| 1339 | |
| 1340 | |
| 1341 | m_s68k_read8_prg: @ 0x000000 - 0x07ffff |
| 1342 | m_s68k_read8_wordram_2M: @ 0x080000 - 0x0bffff |
| 1343 | m_s68k_read8_wordram_1M_b1: @ 0x0c0000 - 0x0dffff, maps to 0x0e0000 |
| 1344 | m_s68k_read8_ram 0x020000 |
| 1345 | |
| 1346 | |
| 1347 | m_s68k_read8_wordram_2M_decode_b0: @ 0x080000 - 0x0bffff |
| 1348 | m_s68k_read8_wordram_2M_decode 0x080000 @ + ^ / 2 |
| 1349 | |
| 1350 | |
| 1351 | m_s68k_read8_wordram_2M_decode_b1: @ 0x080000 - 0x0bffff |
| 1352 | m_s68k_read8_wordram_2M_decode 0x0a0000 @ + ^ / 2 |
| 1353 | |
| 1354 | |
| 1355 | m_s68k_read8_wordram_1M_b0: @ 0x0c0000 - 0x0dffff (same as our offset :) |
| 1356 | m_s68k_read8_ram 0 |
| 1357 | |
| 1358 | |
| 1359 | m_s68k_read8_backup: @ 0xfe0000 - 0xfe3fff (repeated?) |
| 1360 | @ must not trash r3 and r12 |
| 1361 | ldr r1, =(Pico+0x22200) |
| 1362 | mov r0, r0, lsr #1 |
| 1363 | ldr r1, [r1] |
| 1364 | bic r0, r0, #0xff0000 |
| 1365 | bic r0, r0, #0x00e000 |
| 1366 | add r1, r1, #0x110000 |
| 1367 | add r1, r1, #0x000200 |
| 1368 | ldrb r0, [r1, r0] |
| 1369 | bx lr |
| 1370 | |
| 1371 | |
| 1372 | m_s68k_read8_pcm: |
| 1373 | @ must not trash r3 and r12 |
| 1374 | ldr r1, =(Pico+0x22200) |
| 1375 | bic r0, r0, #0xff0000 |
| 1376 | @ bic r0, r0, #0x008000 |
| 1377 | ldr r1, [r1] |
| 1378 | mov r2, #0x110000 |
| 1379 | orr r2, r2, #0x002200 |
| 1380 | cmp r0, #0x2000 |
| 1381 | bge m_s68k_read8_pcm_ram |
| 1382 | cmp r0, #0x20 |
| 1383 | movlt r0, #0 |
| 1384 | bxlt lr |
| 1385 | orr r2, r2, #(0x48+8) @ pcm.ch + addr_offset |
| 1386 | add r1, r1, r2 |
| 1387 | and r2, r0, #0x1c |
| 1388 | ldr r1, [r1, r2, lsl #2] |
| 1389 | tst r0, #2 |
| 1390 | moveq r0, r1, lsr #PCM_STEP_SHIFT |
| 1391 | movne r0, r1, lsr #(PCM_STEP_SHIFT+8) |
| 1392 | and r0, r0, #0xff |
| 1393 | bx lr |
| 1394 | |
| 1395 | m_s68k_read8_pcm_ram: |
| 1396 | orr r2, r2, #0x40 |
| 1397 | ldr r2, [r1, r2] |
| 1398 | add r1, r1, #0x100000 @ pcm_ram |
| 1399 | and r2, r2, #0x0f000000 @ bank |
| 1400 | add r1, r1, r2, lsr #12 |
| 1401 | bic r0, r0, #0x00e000 |
| 1402 | mov r0, r0, lsr #1 |
| 1403 | ldrb r0, [r1, r0] |
| 1404 | bx lr |
| 1405 | |
| 1406 | |
| 1407 | m_s68k_read8_regs: |
| 1408 | bic r0, r0, #0xff0000 |
| 1409 | bic r0, r0, #0x008000 |
| 1410 | tst r0, #0x7e00 |
| 1411 | movne r0, #0 |
| 1412 | bxne lr |
| 1413 | sub r2, r0, #0x58 |
| 1414 | cmp r2, #0x10 |
| 1415 | ldrlo r2, =gfx_cd_read |
| 1416 | ldrhs r2, =s68k_reg_read16 |
| 1417 | stmfd sp!,{r0,lr} |
| 1418 | bic r0, r0, #1 |
| 1419 | mov lr, pc |
| 1420 | bx r2 |
| 1421 | ldmfd sp!,{r1,lr} |
| 1422 | tst r1, #1 |
| 1423 | moveq r0, r0, lsr #8 |
| 1424 | and r0, r0, #0xff |
| 1425 | bx lr |
| 1426 | |
| 1427 | |
| 1428 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 1429 | |
| 1430 | |
| 1431 | .macro m_s68k_read16_ram map_addr |
| 1432 | ldr r1, =(Pico+0x22200) |
| 1433 | bic r0, r0, #1 |
| 1434 | ldr r1, [r1] |
| 1435 | .if \map_addr |
| 1436 | add r0, r0, #\map_addr @ map to our address |
| 1437 | .endif |
| 1438 | ldrh r0, [r1, r0] |
| 1439 | bx lr |
| 1440 | .endm |
| 1441 | |
| 1442 | .macro m_s68k_read16_wordram_2M_decode map_addr |
| 1443 | ldr r2, =(Pico+0x22200) |
| 1444 | eor r0, r0, #2 |
| 1445 | ldr r2, [r2] |
| 1446 | mov r0, r0, lsr #1 @ +4-6 <<16 |
| 1447 | add r2, r2, #\map_addr @ map to our address |
| 1448 | ldrb r0, [r2, r0] |
| 1449 | orr r0, r0, r0, lsl #4 |
| 1450 | bic r0, r0, #0xf0 |
| 1451 | bx lr |
| 1452 | .endm |
| 1453 | |
| 1454 | |
| 1455 | m_s68k_read16_prg: @ 0x000000 - 0x07ffff |
| 1456 | m_s68k_read16_wordram_2M: @ 0x080000 - 0x0bffff |
| 1457 | m_s68k_read16_wordram_1M_b1: @ 0x0c0000 - 0x0dffff, maps to 0x0e0000 |
| 1458 | m_s68k_read16_ram 0x020000 |
| 1459 | |
| 1460 | |
| 1461 | m_s68k_read16_wordram_2M_decode_b0: @ 0x080000 - 0x0bffff |
| 1462 | m_s68k_read16_wordram_2M_decode 0x080000 |
| 1463 | |
| 1464 | |
| 1465 | m_s68k_read16_wordram_2M_decode_b1: @ 0x080000 - 0x0bffff |
| 1466 | m_s68k_read16_wordram_2M_decode 0x0a0000 |
| 1467 | |
| 1468 | |
| 1469 | m_s68k_read16_wordram_1M_b0: @ 0x0c0000 - 0x0dffff (same as our offset :) |
| 1470 | m_s68k_read16_ram 0 |
| 1471 | |
| 1472 | |
| 1473 | @ m_s68k_read16_backup: @ 0xfe0000 - 0xfe3fff (repeated?) |
| 1474 | @ bram is not meant to be accessed by words, does any game do this? |
| 1475 | .equiv m_s68k_read16_backup, m_s68k_read8_backup |
| 1476 | |
| 1477 | |
| 1478 | @ m_s68k_read16_pcm: |
| 1479 | @ pcm is on 8-bit bus, would this be same as byte access? |
| 1480 | .equiv m_s68k_read16_pcm, m_s68k_read8_pcm |
| 1481 | |
| 1482 | |
| 1483 | m_s68k_read16_regs: |
| 1484 | bic r0, r0, #0xff0000 |
| 1485 | bic r0, r0, #0x008000 |
| 1486 | bic r0, r0, #0x000001 |
| 1487 | tst r0, #0x7e00 |
| 1488 | movne r0, #0 |
| 1489 | bxne lr |
| 1490 | sub r2, r0, #0x58 |
| 1491 | cmp r2, #0x10 |
| 1492 | blo gfx_cd_read |
| 1493 | cmp r0, #8 |
| 1494 | bne s68k_reg_read16 |
| 1495 | mov r0, #1 |
| 1496 | b Read_CDC_Host |
| 1497 | |
| 1498 | |
| 1499 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 1500 | |
| 1501 | |
| 1502 | .macro m_s68k_read32_ram map_addr |
| 1503 | ldr r1, =(Pico+0x22200) |
| 1504 | bic r0, r0, #1 |
| 1505 | ldr r1, [r1] |
| 1506 | .if \map_addr |
| 1507 | add r0, r0, #\map_addr @ map to our address |
| 1508 | .endif |
| 1509 | m_read32_gen |
| 1510 | bx lr |
| 1511 | .endm |
| 1512 | |
| 1513 | .macro m_s68k_read32_wordram_2M_decode map_addr |
| 1514 | ldr r2, =(Pico+0x22200) |
| 1515 | eor r0, r0, #2 |
| 1516 | ldr r2, [r2] |
| 1517 | mov r0, r0, lsr #1 @ +4-6 <<16 |
| 1518 | add r2, r2, #\map_addr @ map to our address |
| 1519 | ldrb r1, [r2, r0]! |
| 1520 | tst r0, #1 |
| 1521 | ldrneb r0, [r2, #-1] |
| 1522 | ldreqb r0, [r2, #2] |
| 1523 | orr r1, r1, r1, lsl #4 |
| 1524 | bic r1, r1, #0xf0 |
| 1525 | orr r0, r0, r0, lsl #4 |
| 1526 | bic r0, r0, #0xf0 |
| 1527 | orr r0, r0, r1, lsl #16 |
| 1528 | bx lr |
| 1529 | .endm |
| 1530 | |
| 1531 | |
| 1532 | m_s68k_read32_prg: @ 0x000000 - 0x07ffff |
| 1533 | m_s68k_read32_wordram_2M: @ 0x080000 - 0x0bffff |
| 1534 | m_s68k_read32_wordram_1M_b1: @ 0x0c0000 - 0x0dffff, maps to 0x0e0000 |
| 1535 | m_s68k_read32_ram 0x020000 |
| 1536 | |
| 1537 | |
| 1538 | m_s68k_read32_wordram_2M_decode_b0: @ 0x080000 - 0x0bffff |
| 1539 | m_s68k_read32_wordram_2M_decode 0x080000 |
| 1540 | |
| 1541 | |
| 1542 | m_s68k_read32_wordram_2M_decode_b1: @ 0x080000 - 0x0bffff |
| 1543 | m_s68k_read32_wordram_2M_decode 0x0a0000 |
| 1544 | |
| 1545 | |
| 1546 | m_s68k_read32_wordram_1M_b0: @ 0x0c0000 - 0x0dffff (same as our offset :) |
| 1547 | m_s68k_read32_ram 0 |
| 1548 | |
| 1549 | |
| 1550 | m_s68k_read32_backup: @ 0xfe0000 - 0xfe3fff (repeated?) |
| 1551 | @ bram is not meant to be accessed by words, does any game do this? |
| 1552 | mov r12,lr |
| 1553 | mov r3, r0 |
| 1554 | bl m_s68k_read8_backup @ must preserve r3 and r12 |
| 1555 | mov r1, r0 |
| 1556 | add r0, r3, #2 |
| 1557 | mov r3, r1 |
| 1558 | bl m_s68k_read8_backup |
| 1559 | orr r0, r0, r3, lsl #16 |
| 1560 | bx r12 |
| 1561 | |
| 1562 | |
| 1563 | m_s68k_read32_pcm: |
| 1564 | mov r12,lr |
| 1565 | mov r3, r0 |
| 1566 | bl m_s68k_read8_pcm @ must preserve r3 and r12 |
| 1567 | mov r1, r0 |
| 1568 | add r0, r3, #2 |
| 1569 | mov r3, r1 |
| 1570 | bl m_s68k_read8_pcm |
| 1571 | orr r0, r0, r3, lsl #16 |
| 1572 | bx r12 |
| 1573 | |
| 1574 | |
| 1575 | m_s68k_read32_regs: |
| 1576 | bic r0, r0, #0xff0000 |
| 1577 | bic r0, r0, #0x008000 |
| 1578 | bic r0, r0, #0x000001 |
| 1579 | tst r0, #0x7e00 |
| 1580 | movne r0, #0 |
| 1581 | bxne lr |
| 1582 | sub r2, r0, #0x58 |
| 1583 | cmp r2, #0x10 |
| 1584 | add r1, r0, #2 |
| 1585 | blo m_s68k_read32_regs_gfx |
| 1586 | stmfd sp!,{r1,lr} |
| 1587 | bl s68k_reg_read16 |
| 1588 | swp r0, r0, [sp] |
| 1589 | bl s68k_reg_read16 |
| 1590 | ldmfd sp!,{r1,lr} |
| 1591 | orr r0, r0, r1, lsl #16 |
| 1592 | bx lr |
| 1593 | |
| 1594 | |
| 1595 | m_s68k_read32_regs_gfx: |
| 1596 | stmfd sp!,{r1,lr} |
| 1597 | bl gfx_cd_read |
| 1598 | swp r0, r0, [sp] |
| 1599 | bl gfx_cd_read |
| 1600 | ldmfd sp!,{r1,lr} |
| 1601 | orr r0, r0, r1, lsl #16 |
| 1602 | bx lr |
| 1603 | |
| 1604 | .pool |
| 1605 | |
| 1606 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 1607 | |
| 1608 | |
| 1609 | .macro m_s68k_write8_ram map_addr |
| 1610 | ldr r2, =(Pico+0x22200) |
| 1611 | eor r0, r0, #1 |
| 1612 | ldr r2, [r2] |
| 1613 | .if \map_addr |
| 1614 | add r0, r0, #\map_addr @ map to our address |
| 1615 | .endif |
| 1616 | strb r1, [r2, r0] |
| 1617 | bx lr |
| 1618 | .endm |
| 1619 | |
| 1620 | .macro m_s68k_write8_2M_decode map_addr |
| 1621 | ldr r2, =(Pico+0x22200) |
| 1622 | eor r0, r0, #2 |
| 1623 | ldr r2, [r2] |
| 1624 | movs r0, r0, lsr #1 @ +4-6 <<16 |
| 1625 | add r2, r2, #\map_addr @ map to our address |
| 1626 | .endm |
| 1627 | |
| 1628 | .macro m_s68k_write8_2M_decode_m0 map_addr @ mode off |
| 1629 | m_s68k_write8_2M_decode \map_addr |
| 1630 | ldrb r0, [r2, r0]! |
| 1631 | and r1, r1, #0x0f |
| 1632 | movcc r1, r1, lsl #4 |
| 1633 | andcc r3, r0, #0x0f |
| 1634 | andcs r3, r0, #0xf0 |
| 1635 | orr r3, r3, r1 |
| 1636 | cmp r0, r3 @ avoid writing if result is same |
| 1637 | strneb r3, [r2] |
| 1638 | bx lr |
| 1639 | .endm |
| 1640 | |
| 1641 | .macro m_s68k_write8_2M_decode_m1 map_addr @ mode underwrite |
| 1642 | ands r1, r1, #0x0f |
| 1643 | bxeq lr |
| 1644 | m_s68k_write8_2M_decode \map_addr |
| 1645 | ldrb r0, [r2, r0]! |
| 1646 | movcc r1, r1, lsl #4 |
| 1647 | andcc r3, r0, #0x0f |
| 1648 | andcs r3, r0, #0xf0 |
| 1649 | tst r3, r3 |
| 1650 | bxeq lr |
| 1651 | orr r3, r3, r1 |
| 1652 | cmp r0, r3 |
| 1653 | strneb r3, [r2] |
| 1654 | bx lr |
| 1655 | .endm |
| 1656 | |
| 1657 | .macro m_s68k_write8_2M_decode_m2 map_addr @ mode overwrite |
| 1658 | ands r1, r1, #0x0f |
| 1659 | bxeq lr |
| 1660 | m_s68k_write8_2M_decode_m0 \map_addr @ same as in off mode |
| 1661 | .endm |
| 1662 | |
| 1663 | |
| 1664 | |
| 1665 | m_s68k_write8_prg: @ 0x000000 - 0x07ffff |
| 1666 | m_s68k_write8_wordram_2M: @ 0x080000 - 0x0bffff |
| 1667 | m_s68k_write8_wordram_1M_b1: @ 0x0c0000 - 0x0dffff, maps to 0x0e0000 |
| 1668 | m_s68k_write8_ram 0x020000 |
| 1669 | |
| 1670 | |
| 1671 | m_s68k_write8_2M_decode_b0_m0: @ 0x080000 - 0x0bffff |
| 1672 | m_s68k_write8_2M_decode_m0 0x080000 |
| 1673 | |
| 1674 | m_s68k_write8_2M_decode_b0_m1: |
| 1675 | m_s68k_write8_2M_decode_m1 0x080000 |
| 1676 | |
| 1677 | m_s68k_write8_2M_decode_b0_m2: |
| 1678 | m_s68k_write8_2M_decode_m2 0x080000 |
| 1679 | |
| 1680 | m_s68k_write8_2M_decode_b1_m0: |
| 1681 | m_s68k_write8_2M_decode_m0 0x0a0000 |
| 1682 | |
| 1683 | m_s68k_write8_2M_decode_b1_m1: |
| 1684 | m_s68k_write8_2M_decode_m1 0x0a0000 |
| 1685 | |
| 1686 | m_s68k_write8_2M_decode_b1_m2: |
| 1687 | m_s68k_write8_2M_decode_m2 0x0a0000 |
| 1688 | |
| 1689 | |
| 1690 | m_s68k_write8_wordram_1M_b0: @ 0x0c0000 - 0x0dffff (same as our offset :) |
| 1691 | m_s68k_write8_ram 0 |
| 1692 | |
| 1693 | |
| 1694 | m_s68k_write8_backup: @ 0xfe0000 - 0xfe3fff (repeated?) |
| 1695 | @ must not trash r3 and r12 |
| 1696 | ldr r2, =(Pico+0x22200) |
| 1697 | mov r0, r0, lsr #1 |
| 1698 | ldr r2, [r2] |
| 1699 | bic r0, r0, #0xff0000 |
| 1700 | bic r0, r0, #0x00e000 |
| 1701 | add r2, r2, #0x110000 |
| 1702 | add r2, r2, #0x000200 |
| 1703 | strb r1, [r2, r0] |
| 1704 | ldr r1, =SRam |
| 1705 | mov r0, #1 |
| 1706 | strb r0, [r1, #0x0e] @ SRam.changed = 1 |
| 1707 | bx lr |
| 1708 | |
| 1709 | |
| 1710 | m_s68k_write8_pcm: |
| 1711 | bic r0, r0, #0xff0000 |
| 1712 | cmp r0, #0x12 |
| 1713 | movlt r0, r0, lsr #1 |
| 1714 | blt pcm_write |
| 1715 | |
| 1716 | cmp r0, #0x2000 |
| 1717 | bxlt lr |
| 1718 | |
| 1719 | m_s68k_write8_pcm_ram: |
| 1720 | ldr r3, =(Pico+0x22200) |
| 1721 | bic r0, r0, #0x00e000 |
| 1722 | ldr r3, [r3] |
| 1723 | mov r0, r0, lsr #1 |
| 1724 | add r2, r3, #0x110000 |
| 1725 | add r2, r2, #0x002200 |
| 1726 | add r2, r2, #0x000040 |
| 1727 | ldr r2, [r2] |
| 1728 | add r3, r3, #0x100000 @ pcm_ram |
| 1729 | and r2, r2, #0x0f000000 @ bank |
| 1730 | add r3, r3, r2, lsr #12 |
| 1731 | strb r1, [r3, r0] |
| 1732 | bx lr |
| 1733 | |
| 1734 | |
| 1735 | m_s68k_write8_regs: |
| 1736 | bic r0, r0, #0xff0000 |
| 1737 | bic r0, r0, #0x008000 |
| 1738 | tst r0, #0x7e00 |
| 1739 | movne r0, #0 |
| 1740 | bxne lr |
| 1741 | sub r2, r0, #0x58 |
| 1742 | cmp r2, #0x10 |
| 1743 | bhs s68k_reg_write8 |
| 1744 | bic r0, r0, #1 |
| 1745 | orr r1, r1, r1, lsl #8 |
| 1746 | b gfx_cd_write16 |
| 1747 | |
| 1748 | |
| 1749 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 1750 | |
| 1751 | |
| 1752 | .macro m_s68k_write16_ram map_addr |
| 1753 | ldr r2, =(Pico+0x22200) |
| 1754 | bic r0, r0, #1 |
| 1755 | ldr r2, [r2] |
| 1756 | .if \map_addr |
| 1757 | add r0, r0, #\map_addr @ map to our address |
| 1758 | .endif |
| 1759 | strh r1, [r2, r0] |
| 1760 | bx lr |
| 1761 | .endm |
| 1762 | |
| 1763 | .macro m_s68k_write16_2M_decode map_addr |
| 1764 | ldr r2, =(Pico+0x22200) |
| 1765 | eor r0, r0, #2 |
| 1766 | ldr r2, [r2] |
| 1767 | mov r0, r0, lsr #1 @ +4-6 <<16 |
| 1768 | add r2, r2, #\map_addr @ map to our address |
| 1769 | .endm |
| 1770 | |
| 1771 | .macro m_s68k_write16_2M_decode_m0 map_addr @ mode off |
| 1772 | m_s68k_write16_2M_decode \map_addr |
| 1773 | bic r1, r1, #0xf0 |
| 1774 | orr r1, r1, r1, lsr #4 |
| 1775 | strb r1, [r2, r0] |
| 1776 | bx lr |
| 1777 | .endm |
| 1778 | |
| 1779 | .macro m_s68k_write16_2M_decode_m1 map_addr @ mode underwrite |
| 1780 | bics r1, r1, #0xf000 |
| 1781 | bicnes r1, r1, #0x00f0 |
| 1782 | bxeq lr |
| 1783 | orr r1, r1, r1, lsr #4 |
| 1784 | m_s68k_write16_2M_decode \map_addr |
| 1785 | ldrb r0, [r2, r0]! |
| 1786 | and r3, r1, #0x0f |
| 1787 | and r1, r1, #0xf0 |
| 1788 | tst r0, #0x0f |
| 1789 | orreq r0, r0, r3 |
| 1790 | tst r0, #0xf0 |
| 1791 | orreq r0, r0, r1 |
| 1792 | strb r0, [r2] |
| 1793 | bx lr |
| 1794 | .endm |
| 1795 | |
| 1796 | .macro m_s68k_write16_2M_decode_m2 map_addr @ mode overwrite |
| 1797 | bics r1, r1, #0xf000 |
| 1798 | bicnes r1, r1, #0x00f0 |
| 1799 | bxeq lr |
| 1800 | orr r1, r1, r1, lsr #4 |
| 1801 | m_s68k_write16_2M_decode \map_addr |
| 1802 | ldrb r0, [r2, r0]! |
| 1803 | ands r3, r1, #0x0f |
| 1804 | andne r0, r0, #0xf0 |
| 1805 | orrne r0, r0, r3 |
| 1806 | ands r1, r1, #0xf0 |
| 1807 | andne r0, r0, #0x0f |
| 1808 | orrne r0, r0, r1 |
| 1809 | strb r0, [r2] |
| 1810 | bx lr |
| 1811 | .endm |
| 1812 | |
| 1813 | |
| 1814 | |
| 1815 | m_s68k_write16_prg: @ 0x000000 - 0x07ffff |
| 1816 | m_s68k_write16_wordram_2M: @ 0x080000 - 0x0bffff |
| 1817 | m_s68k_write16_wordram_1M_b1: @ 0x0c0000 - 0x0dffff, maps to 0x0e0000 |
| 1818 | m_s68k_write16_ram 0x020000 |
| 1819 | |
| 1820 | |
| 1821 | m_s68k_write16_2M_decode_b0_m0: @ 0x080000 - 0x0bffff |
| 1822 | m_s68k_write16_2M_decode_m0 0x080000 |
| 1823 | |
| 1824 | m_s68k_write16_2M_decode_b0_m1: |
| 1825 | m_s68k_write16_2M_decode_m1 0x080000 |
| 1826 | |
| 1827 | m_s68k_write16_2M_decode_b0_m2: |
| 1828 | m_s68k_write16_2M_decode_m2 0x080000 |
| 1829 | |
| 1830 | m_s68k_write16_2M_decode_b1_m0: |
| 1831 | m_s68k_write16_2M_decode_m0 0x0a0000 |
| 1832 | |
| 1833 | m_s68k_write16_2M_decode_b1_m1: |
| 1834 | m_s68k_write16_2M_decode_m1 0x0a0000 |
| 1835 | |
| 1836 | m_s68k_write16_2M_decode_b1_m2: |
| 1837 | m_s68k_write16_2M_decode_m2 0x0a0000 |
| 1838 | |
| 1839 | |
| 1840 | m_s68k_write16_wordram_1M_b0: @ 0x0c0000 - 0x0dffff (same as our offset :) |
| 1841 | m_s68k_write16_ram 0 |
| 1842 | |
| 1843 | |
| 1844 | @ m_s68k_write16_backup: |
| 1845 | .equiv m_s68k_write16_backup, m_s68k_write8_backup |
| 1846 | |
| 1847 | |
| 1848 | @ m_s68k_write16_pcm: |
| 1849 | .equiv m_s68k_write16_pcm, m_s68k_write8_pcm |
| 1850 | |
| 1851 | |
| 1852 | m_s68k_write16_regs: |
| 1853 | bic r0, r0, #0xff0000 |
| 1854 | bic r0, r0, #0x008000 |
| 1855 | bic r0, r0, #1 |
| 1856 | tst r0, #0x7e00 |
| 1857 | movne r0, #0 |
| 1858 | bxne lr |
| 1859 | cmp r0, #0x0e |
| 1860 | beq m_s68k_write16_regs_spec |
| 1861 | sub r2, r0, #0x58 |
| 1862 | cmp r2, #0x10 |
| 1863 | blo gfx_cd_write16 |
| 1864 | and r3, r1, #0xff |
| 1865 | add r2, r0, #1 |
| 1866 | stmfd sp!,{r2,r3,lr} |
| 1867 | mov r1, r1, lsr #8 |
| 1868 | bl s68k_reg_write8 |
| 1869 | ldmfd sp!,{r0,r1,lr} |
| 1870 | b s68k_reg_write8 |
| 1871 | |
| 1872 | m_s68k_write16_regs_spec: @ special case |
| 1873 | ldr r2, =(Pico+0x22200) |
| 1874 | mov r0, #0x110000 |
| 1875 | ldr r2, [r2] |
| 1876 | add r0, r0, #0x00000f |
| 1877 | strb r1, [r2, r0] @ if (a == 0xe) s68k_regs[0xf] = d; |
| 1878 | bx lr |
| 1879 | |
| 1880 | |
| 1881 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 1882 | |
| 1883 | |
| 1884 | .macro m_s68k_write32_ram map_addr |
| 1885 | ldr r2, =(Pico+0x22200) |
| 1886 | bic r0, r0, #1 |
| 1887 | ldr r2, [r2] |
| 1888 | .if \map_addr |
| 1889 | add r0, r0, #\map_addr @ map to our address |
| 1890 | .endif |
| 1891 | m_write32_gen |
| 1892 | bx lr |
| 1893 | .endm |
| 1894 | |
| 1895 | .macro m_s68k_write32_2M_decode map_addr |
| 1896 | ldr r2, =(Pico+0x22200) |
| 1897 | eor r0, r0, #2 |
| 1898 | ldr r2, [r2] |
| 1899 | mov r0, r0, lsr #1 @ +4-6 <<16 |
| 1900 | add r2, r2, #\map_addr @ map to our address |
| 1901 | .endm |
| 1902 | |
| 1903 | .macro m_s68k_write32_2M_decode_m0 map_addr @ mode off |
| 1904 | m_s68k_write32_2M_decode \map_addr |
| 1905 | bic r1, r1, #0x000000f0 |
| 1906 | bic r1, r1, #0x00f00000 |
| 1907 | orr r1, r1, r1, lsr #4 |
| 1908 | mov r3, r1, lsr #16 |
| 1909 | strb r3, [r2, r0]! |
| 1910 | tst r0, #1 |
| 1911 | strneb r1, [r2, #-1] |
| 1912 | streqb r1, [r2, #3] |
| 1913 | bx lr |
| 1914 | .endm |
| 1915 | |
| 1916 | .macro m_s68k_write32_2M_decode_m1 map_addr @ mode underwrite |
| 1917 | bics r1, r1, #0x000000f0 |
| 1918 | bicnes r1, r1, #0x0000f000 |
| 1919 | bicnes r1, r1, #0x00f00000 |
| 1920 | bicnes r1, r1, #0xf0000000 |
| 1921 | bxeq lr |
| 1922 | orr r1, r1, r1, lsr #4 |
| 1923 | m_s68k_write32_2M_decode \map_addr |
| 1924 | ldrb r3, [r2, r0]! |
| 1925 | tst r0, #1 |
| 1926 | ldrneb r0, [r2, #-1] |
| 1927 | ldreqb r0, [r2, #3] |
| 1928 | and r12,r1, #0x0000000f |
| 1929 | orr r0, r0, r3, lsl #16 |
| 1930 | orrne r0, r0, #0x80000000 @ remember addr lsb bit |
| 1931 | tst r0, #0x0000000f |
| 1932 | orreq r0, r0, r12 |
| 1933 | tst r0, #0x000000f0 |
| 1934 | andeq r12,r1, #0x000000f0 |
| 1935 | orreq r0, r0, r12 |
| 1936 | tst r0, #0x000f0000 |
| 1937 | andeq r12,r1, #0x000f0000 |
| 1938 | orreq r0, r0, r12 |
| 1939 | tst r0, #0x00f00000 |
| 1940 | andeq r12,r1, #0x00f00000 |
| 1941 | orreq r0, r0, r12 |
| 1942 | tst r0, #0x80000000 |
| 1943 | strneb r0, [r2, #-1] |
| 1944 | streqb r0, [r2, #3] |
| 1945 | mov r0, r0, lsr #16 |
| 1946 | strb r0, [r2] |
| 1947 | bx lr |
| 1948 | .endm |
| 1949 | |
| 1950 | .macro m_s68k_write32_2M_decode_m2 map_addr @ mode overwrite |
| 1951 | bics r1, r1, #0x000000f0 |
| 1952 | bicnes r1, r1, #0x0000f000 |
| 1953 | bicnes r1, r1, #0x00f00000 |
| 1954 | bicnes r1, r1, #0xf0000000 |
| 1955 | bxeq lr |
| 1956 | orr r1, r1, r1, lsr #4 |
| 1957 | m_s68k_write32_2M_decode \map_addr |
| 1958 | ldrb r3, [r2, r0]! |
| 1959 | tst r0, #1 |
| 1960 | ldrneb r0, [r2, #-1] |
| 1961 | ldreqb r0, [r2, #3] |
| 1962 | orrne r1, r1, #0x80000000 @ remember addr lsb bit |
| 1963 | orr r0, r0, r3, lsl #16 |
| 1964 | tst r1, #0x0000000f |
| 1965 | andeq r12,r0, #0x0000000f |
| 1966 | orreq r1, r1, r12 |
| 1967 | tst r1, #0x000000f0 |
| 1968 | andeq r12,r0, #0x000000f0 |
| 1969 | orreq r1, r1, r12 |
| 1970 | tst r1, #0x000f0000 |
| 1971 | andeq r12,r0, #0x000f0000 |
| 1972 | orreq r1, r1, r12 |
| 1973 | tst r1, #0x00f00000 |
| 1974 | andeq r12,r0, #0x00f00000 |
| 1975 | orreq r1, r1, r12 |
| 1976 | cmp r0, r1 |
| 1977 | bxeq lr |
| 1978 | tst r1, #0x80000000 |
| 1979 | strneb r1, [r2, #-1] |
| 1980 | streqb r1, [r2, #3] |
| 1981 | mov r1, r1, lsr #16 |
| 1982 | strb r1, [r2] |
| 1983 | bx lr |
| 1984 | .endm |
| 1985 | |
| 1986 | |
| 1987 | |
| 1988 | m_s68k_write32_prg: @ 0x000000 - 0x07ffff |
| 1989 | m_s68k_write32_wordram_2M: @ 0x080000 - 0x0bffff |
| 1990 | m_s68k_write32_wordram_1M_b1: @ 0x0c0000 - 0x0dffff, maps to 0x0e0000 |
| 1991 | m_s68k_write32_ram 0x020000 |
| 1992 | |
| 1993 | |
| 1994 | m_s68k_write32_2M_decode_b0_m0: @ 0x080000 - 0x0bffff |
| 1995 | m_s68k_write32_2M_decode_m0 0x080000 |
| 1996 | |
| 1997 | m_s68k_write32_2M_decode_b0_m1: |
| 1998 | m_s68k_write32_2M_decode_m1 0x080000 |
| 1999 | |
| 2000 | m_s68k_write32_2M_decode_b0_m2: |
| 2001 | m_s68k_write32_2M_decode_m2 0x080000 |
| 2002 | |
| 2003 | m_s68k_write32_2M_decode_b1_m0: |
| 2004 | m_s68k_write32_2M_decode_m0 0x0a0000 |
| 2005 | |
| 2006 | m_s68k_write32_2M_decode_b1_m1: |
| 2007 | m_s68k_write32_2M_decode_m1 0x0a0000 |
| 2008 | |
| 2009 | m_s68k_write32_2M_decode_b1_m2: |
| 2010 | m_s68k_write32_2M_decode_m2 0x0a0000 |
| 2011 | |
| 2012 | |
| 2013 | m_s68k_write32_wordram_1M_b0: @ 0x0c0000 - 0x0dffff (same as our offset :) |
| 2014 | m_s68k_write32_ram 0 |
| 2015 | |
| 2016 | |
| 2017 | m_s68k_write32_backup: |
| 2018 | add r12,r0, #2 |
| 2019 | mov r3, r1 |
| 2020 | mov r1, r1, lsr #16 |
| 2021 | stmfd sp!,{lr} |
| 2022 | bl m_s68k_write8_backup @ must preserve r3 and r12 |
| 2023 | ldmfd sp!,{lr} |
| 2024 | mov r0, r12 |
| 2025 | mov r1, r3 |
| 2026 | b m_s68k_write8_backup |
| 2027 | |
| 2028 | |
| 2029 | m_s68k_write32_pcm: |
| 2030 | bic r0, r0, #0xff0000 |
| 2031 | cmp r0, #0x12 |
| 2032 | blt m_s68k_write32_pcm_reg |
| 2033 | |
| 2034 | cmp r0, #0x2000 |
| 2035 | bxlt lr |
| 2036 | |
| 2037 | m_s68k_write32_pcm_ram: |
| 2038 | ldr r3, =(Pico+0x22200) |
| 2039 | bic r0, r0, #0x00e000 |
| 2040 | ldr r3, [r3] |
| 2041 | mov r0, r0, lsr #1 |
| 2042 | add r2, r3, #0x110000 |
| 2043 | add r2, r2, #0x002200 |
| 2044 | add r2, r2, #0x000040 |
| 2045 | ldr r2, [r2] |
| 2046 | add r3, r3, #0x100000 @ pcm_ram |
| 2047 | and r2, r2, #0x0f000000 @ bank |
| 2048 | add r3, r3, r2, lsr #12 |
| 2049 | mov r1, r1, ror #16 |
| 2050 | strb r1, [r3, r0]! |
| 2051 | mov r1, r1, ror #16 |
| 2052 | strb r1, [r3] |
| 2053 | bx lr |
| 2054 | |
| 2055 | m_s68k_write32_pcm_reg: |
| 2056 | mov r0, r0, lsr #1 |
| 2057 | add r2, r0, #1 |
| 2058 | mov r3, r1 |
| 2059 | stmfd sp!,{r2,r3,lr} |
| 2060 | mov r1, r1, lsr #16 |
| 2061 | bl pcm_write |
| 2062 | ldmfd sp!,{r0,r1,lr} |
| 2063 | b pcm_write |
| 2064 | |
| 2065 | |
| 2066 | m_s68k_write32_regs: |
| 2067 | bic r0, r0, #0xff0000 |
| 2068 | bic r0, r0, #0x008000 |
| 2069 | bic r0, r0, #1 |
| 2070 | tst r0, #0x7e00 |
| 2071 | movne r0, #0 |
| 2072 | bxne lr |
| 2073 | sub r2, r0, #0x58 |
| 2074 | cmp r2, #0x10 |
| 2075 | blo m_s68k_write32_regs_gfx |
| 2076 | |
| 2077 | stmfd sp!,{r0,r1,lr} |
| 2078 | mov r1, r1, lsr #24 |
| 2079 | bl s68k_reg_write8 |
| 2080 | ldr r0, [sp] |
| 2081 | ldr r1, [sp, #4] |
| 2082 | add r0, r0, #1 |
| 2083 | mov r1, r1, lsr #16 |
| 2084 | bl s68k_reg_write8 |
| 2085 | ldr r0, [sp] |
| 2086 | ldr r1, [sp, #4] |
| 2087 | add r0, r0, #2 |
| 2088 | mov r1, r1, lsr #8 |
| 2089 | bl s68k_reg_write8 |
| 2090 | ldmfd sp!,{r0,r1,lr} |
| 2091 | add r0, r0, #3 |
| 2092 | b s68k_reg_write8 |
| 2093 | |
| 2094 | m_s68k_write32_regs_gfx: |
| 2095 | mov r3, r1 |
| 2096 | add r2, r0, #2 |
| 2097 | stmfd sp!,{r2,r3,lr} |
| 2098 | mov r1, r1, lsr #16 |
| 2099 | bl gfx_cd_write16 |
| 2100 | ldmfd sp!,{r0,r1,lr} |
| 2101 | b gfx_cd_write16 |
| 2102 | |