| 1 | @ vim:filetype=armasm |
| 2 | |
| 3 | @ Memory I/O handlers for Sega/Mega CD emulation |
| 4 | @ (c) Copyright 2007, Grazvydas "notaz" Ignotas |
| 5 | |
| 6 | |
| 7 | |
| 8 | .equiv PCM_STEP_SHIFT, 11 |
| 9 | .equiv POLL_LIMIT, 16 |
| 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_m68k_&\on&\sz&_bcram_size @ 0x400000 |
| 30 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x420000 |
| 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_m68k_&\on&\sz&_bcram @ 0x600000 |
| 35 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x620000 |
| 36 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ - 0x6fffff |
| 37 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x700000 |
| 38 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null @ - 0x7dffff |
| 39 | .long m_m68k_&\on&\sz&_bcram_reg @ 0x7e0000 |
| 40 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x800000 |
| 41 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ - 0x8fffff |
| 42 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0x900000 |
| 43 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ - 0x9fffff |
| 44 | .long m_m68k_&\on&\sz&_system_io @ 0xa00000 - 0xa1ffff |
| 45 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0xa20000 - 0xa7ffff |
| 46 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0xa80000 - 0xafffff |
| 47 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0xb00000 |
| 48 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ - 0xbfffff |
| 49 | .long m_m68k_&\on&\sz&_vdp, m_m68k_&\on&\sz&_vdp, m_m68k_&\on&\sz&_vdp, m_m68k_&\on&\sz&_vdp @ 0xc00000 |
| 50 | .long m_m68k_&\on&\sz&_vdp, m_m68k_&\on&\sz&_vdp, m_m68k_&\on&\sz&_vdp, m_m68k_&\on&\sz&_vdp @ - 0xcfffff |
| 51 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ 0xd00000 |
| 52 | .long m_&\on&_null, m_&\on&_null, m_&\on&_null, m_&\on&_null @ - 0xdfffff |
| 53 | .long m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram @ 0xe00000 |
| 54 | .long m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram @ - 0xefffff |
| 55 | .long m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram @ 0xf00000 |
| 56 | .long m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram, m_m68k_&\on&\sz&_ram @ - 0xffffff |
| 57 | .endm |
| 58 | |
| 59 | .macro mk_s68k_jump_table on sz @ operation name, size |
| 60 | .long m_s68k_&\on&\sz&_prg, m_s68k_&\on&\sz&_prg, m_s68k_&\on&\sz&_prg, m_s68k_&\on&\sz&_prg @ 0x000000 - 0x07ffff |
| 61 | .long m_s68k_&\on&\sz&_wordram_2M @ 0x080000 - 0x09ffff |
| 62 | .long m_s68k_&\on&\sz&_wordram_2M @ 0x0a0000 - 0x0bffff |
| 63 | .long m_&\on&_null @ 0x0c0000 - 0x0dffff, 1M area |
| 64 | .long m_&\on&_null @ 0x0e0000 - 0x0fffff |
| 65 | .endm |
| 66 | |
| 67 | |
| 68 | @ the jumptables themselves. |
| 69 | m_m68k_read8_table: mk_m68k_jump_table read 8 |
| 70 | m_m68k_read16_table: mk_m68k_jump_table read 16 |
| 71 | m_m68k_read32_table: mk_m68k_jump_table read 32 |
| 72 | m_m68k_write8_table: mk_m68k_jump_table write 8 |
| 73 | m_m68k_write16_table: mk_m68k_jump_table write 16 |
| 74 | m_m68k_write32_table: mk_m68k_jump_table write 32 |
| 75 | |
| 76 | m_s68k_read8_table: mk_s68k_jump_table read 8 |
| 77 | m_s68k_read16_table: mk_s68k_jump_table read 16 |
| 78 | m_s68k_read32_table: mk_s68k_jump_table read 32 |
| 79 | m_s68k_write8_table: mk_s68k_jump_table write 8 |
| 80 | m_s68k_write16_table: mk_s68k_jump_table write 16 |
| 81 | m_s68k_write32_table: mk_s68k_jump_table write 32 |
| 82 | |
| 83 | m_s68k_decode_write_table: |
| 84 | .long m_s68k_write8_2M_decode_b0_m0 |
| 85 | .long m_s68k_write16_2M_decode_b0_m0 |
| 86 | .long m_s68k_write32_2M_decode_b0_m0 |
| 87 | .long m_s68k_write8_2M_decode_b0_m1 |
| 88 | .long m_s68k_write16_2M_decode_b0_m1 |
| 89 | .long m_s68k_write32_2M_decode_b0_m1 |
| 90 | .long m_s68k_write8_2M_decode_b0_m2 |
| 91 | .long m_s68k_write16_2M_decode_b0_m2 |
| 92 | .long m_s68k_write32_2M_decode_b0_m2 |
| 93 | .long m_s68k_write8_2M_decode_b1_m0 |
| 94 | .long m_s68k_write16_2M_decode_b1_m0 |
| 95 | .long m_s68k_write32_2M_decode_b1_m0 |
| 96 | .long m_s68k_write8_2M_decode_b1_m1 |
| 97 | .long m_s68k_write16_2M_decode_b1_m1 |
| 98 | .long m_s68k_write32_2M_decode_b1_m1 |
| 99 | .long m_s68k_write8_2M_decode_b1_m2 |
| 100 | .long m_s68k_write16_2M_decode_b1_m2 |
| 101 | .long m_s68k_write32_2M_decode_b1_m2 |
| 102 | |
| 103 | |
| 104 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 105 | |
| 106 | .text |
| 107 | .align 4 |
| 108 | |
| 109 | .global PicoMemResetCD |
| 110 | .global PicoMemResetCDdecode |
| 111 | .global PicoReadM68k8 |
| 112 | .global PicoReadM68k16 |
| 113 | .global PicoReadM68k32 |
| 114 | .global PicoWriteM68k8 |
| 115 | .global PicoWriteM68k16 |
| 116 | .global PicoWriteM68k32 |
| 117 | .global PicoReadS68k8 |
| 118 | .global PicoReadS68k16 |
| 119 | .global PicoReadS68k32 |
| 120 | .global PicoWriteS68k8 |
| 121 | .global PicoWriteS68k16 |
| 122 | .global PicoWriteS68k32 |
| 123 | |
| 124 | @ externs, just for reference |
| 125 | .extern Pico |
| 126 | .extern z80Read8 |
| 127 | .extern OtherRead16 |
| 128 | .extern PicoVideoRead |
| 129 | .extern Read_CDC_Host |
| 130 | .extern m68k_reg_write8 |
| 131 | .extern OtherWrite8 |
| 132 | .extern OtherWrite16 |
| 133 | .extern gfx_cd_read |
| 134 | .extern s68k_reg_read16 |
| 135 | .extern SRam |
| 136 | .extern gfx_cd_write16 |
| 137 | .extern s68k_reg_write8 |
| 138 | .extern s68k_poll_adclk |
| 139 | .extern PicoCpuS68k |
| 140 | .extern s68k_poll_detect |
| 141 | .extern SN76496Write |
| 142 | |
| 143 | |
| 144 | @ r0=reg3, r1-r3=temp |
| 145 | .macro mk_update_table on sz @ operation name, size |
| 146 | @ we only set word-ram handlers |
| 147 | ldr r1, =m_m68k_&\on&\sz&_table |
| 148 | ldr r12,=m_s68k_&\on&\sz&_table |
| 149 | tst r0, #4 |
| 150 | bne 0f @ pmr_8_1M |
| 151 | |
| 152 | @ pmr_8_2M: |
| 153 | ldr r2, =m_m68k_&\on&\sz&_wordram0_2M |
| 154 | ldr r3, =m_s68k_&\on&\sz&_wordram_2M |
| 155 | str r2, [r1, #16*4] |
| 156 | str r2, [r1, #17*4] |
| 157 | ldr r2, =m_&\on&_null |
| 158 | str r3, [r12,#4*4] |
| 159 | str r3, [r12,#5*4] |
| 160 | str r2, [r12,#6*4] |
| 161 | b 9f @ pmr_8_done |
| 162 | |
| 163 | 0: @ pmr_8_1M: |
| 164 | tst r0, #1 |
| 165 | bne 1f @ pmr_8_1M1 |
| 166 | |
| 167 | @ pmr_8_1M0: |
| 168 | ldr r2, =m_m68k_&\on&\sz&_wordram0_1M_b0 |
| 169 | ldr r3, =m_m68k_&\on&\sz&_wordram1_1M_b0 |
| 170 | str r2, [r1, #16*4] |
| 171 | str r3, [r1, #17*4] |
| 172 | ldr r3, =m_s68k_&\on&\sz&_wordram_1M_b1 |
| 173 | .ifeqs "\on", "read" |
| 174 | ldr r2, =m_s68k_&\on&\sz&_wordram_2M_decode_b1 |
| 175 | str r2, [r12,#4*4] |
| 176 | str r2, [r12,#5*4] |
| 177 | .endif |
| 178 | str r3, [r12,#6*4] |
| 179 | b 9f @ pmr_8_done |
| 180 | |
| 181 | 1: @ pmr_8_1M1: |
| 182 | ldr r2, =m_m68k_&\on&\sz&_wordram0_1M_b1 |
| 183 | ldr r3, =m_m68k_&\on&\sz&_wordram1_1M_b1 |
| 184 | str r2, [r1, #16*4] |
| 185 | str r3, [r1, #17*4] |
| 186 | ldr r3, =m_s68k_&\on&\sz&_wordram_1M_b0 |
| 187 | .ifeqs "\on", "read" |
| 188 | ldr r2, =m_s68k_&\on&\sz&_wordram_2M_decode_b0 |
| 189 | str r2, [r12,#4*4] |
| 190 | str r2, [r12,#5*4] |
| 191 | .endif |
| 192 | str r3, [r12,#6*4] |
| 193 | |
| 194 | 9: @ pmr_8_done: |
| 195 | .endm |
| 196 | |
| 197 | |
| 198 | PicoMemResetCD: @ r3 |
| 199 | mk_update_table read 8 |
| 200 | mk_update_table read 16 |
| 201 | mk_update_table read 32 |
| 202 | mk_update_table write 8 |
| 203 | mk_update_table write 16 |
| 204 | mk_update_table write 32 |
| 205 | bx lr |
| 206 | |
| 207 | |
| 208 | PicoMemResetCDdecode: @reg3 |
| 209 | tst r0, #4 |
| 210 | bxeq lr @ we should not be called in 2M mode |
| 211 | ldr r1, =m_s68k_write8_table |
| 212 | ldr r3, =m_s68k_decode_write_table |
| 213 | and r2, r0, #0x18 |
| 214 | mov r2, r2, lsr #3 |
| 215 | cmp r2, #3 |
| 216 | moveq r2, #2 @ mode3 is same as mode2? |
| 217 | tst r0, #1 |
| 218 | addeq r2, r2, #3 @ bank1 (r2=0..5) |
| 219 | add r2, r2, r2, lsl #1 @ *= 3 |
| 220 | add r2, r3, r2, lsl #2 |
| 221 | ldmia r2, {r0,r3,r12} |
| 222 | str r0, [r1, #4*4] |
| 223 | str r0, [r1, #5*4] |
| 224 | str r3, [r1, #4*4+8*4] |
| 225 | str r3, [r1, #5*4+8*4] |
| 226 | str r12,[r1, #4*4+8*4*2] |
| 227 | str r12,[r1, #5*4+8*4*2] |
| 228 | bx lr |
| 229 | |
| 230 | |
| 231 | .pool |
| 232 | |
| 233 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 234 | |
| 235 | .macro mk_entry_m68k table |
| 236 | ldr r2, =\table |
| 237 | bic r0, r0, #0xff000000 |
| 238 | and r3, r0, #0x00fe0000 |
| 239 | ldr pc, [r2, r3, lsr #15] |
| 240 | .endm |
| 241 | |
| 242 | PicoReadM68k8: @ u32 a |
| 243 | mk_entry_m68k m_m68k_read8_table |
| 244 | |
| 245 | PicoReadM68k16: @ u32 a |
| 246 | mk_entry_m68k m_m68k_read16_table |
| 247 | |
| 248 | PicoReadM68k32: @ u32 a |
| 249 | mk_entry_m68k m_m68k_read32_table |
| 250 | |
| 251 | PicoWriteM68k8: @ u32 a, u8 d |
| 252 | mk_entry_m68k m_m68k_write8_table |
| 253 | |
| 254 | PicoWriteM68k16: @ u32 a, u16 d |
| 255 | mk_entry_m68k m_m68k_write16_table |
| 256 | |
| 257 | PicoWriteM68k32: @ u32 a, u32 d |
| 258 | mk_entry_m68k m_m68k_write32_table |
| 259 | |
| 260 | |
| 261 | .macro mk_entry_s68k on sz |
| 262 | bic r0, r0, #0xff000000 |
| 263 | cmp r0, #0x00080000 |
| 264 | blt m_s68k_&\on&\sz&_prg |
| 265 | cmp r0, #0x000e0000 |
| 266 | ldrlt r2, =m_s68k_&\on&\sz&_table |
| 267 | andlt r3, r0, #0x000e0000 |
| 268 | ldrlt pc, [r2, r3, lsr #15] |
| 269 | mov r3, #0x00ff0000 |
| 270 | orr r3, r3, #0x00008000 |
| 271 | cmp r0, r3 |
| 272 | bge m_s68k_&\on&\sz&_regs |
| 273 | cmp r0, #0x00ff0000 |
| 274 | bge m_s68k_&\on&\sz&_pcm |
| 275 | cmp r0, #0x00fe0000 |
| 276 | bge m_s68k_&\on&\sz&_backup |
| 277 | mov r0, #0 |
| 278 | bx lr |
| 279 | .endm |
| 280 | |
| 281 | PicoReadS68k8: @ u32 a |
| 282 | mk_entry_s68k read 8 |
| 283 | |
| 284 | PicoReadS68k16: @ u32 a |
| 285 | mk_entry_s68k read 16 |
| 286 | |
| 287 | PicoReadS68k32: @ u32 a |
| 288 | mk_entry_s68k read 32 |
| 289 | |
| 290 | PicoWriteS68k8: @ u32 a, u8 d |
| 291 | mk_entry_s68k write 8 |
| 292 | |
| 293 | PicoWriteS68k16: @ u32 a, u16 d |
| 294 | mk_entry_s68k write 16 |
| 295 | |
| 296 | PicoWriteS68k32: @ u32 a, u32 d |
| 297 | mk_entry_s68k write 32 |
| 298 | |
| 299 | |
| 300 | .pool |
| 301 | |
| 302 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 303 | |
| 304 | @ utilities |
| 305 | |
| 306 | @ r0=addr[in,out], r1,r2=tmp |
| 307 | .macro cell_map |
| 308 | ands r1, r0, #0x01c000 |
| 309 | ldrne pc, [pc, r1, lsr #12] |
| 310 | beq 0f @ most common? |
| 311 | .long 0f |
| 312 | .long 0f |
| 313 | .long 0f |
| 314 | .long 0f |
| 315 | .long 1f |
| 316 | .long 1f |
| 317 | .long 2f |
| 318 | .long 3f |
| 319 | 1: @ x16 cells |
| 320 | and r1, r0, #0x7e00 @ col |
| 321 | and r2, r0, #0x01fc @ row |
| 322 | orr r2, r2, #0x0400 |
| 323 | orr r1, r2, r1, ror #13 |
| 324 | b 9f |
| 325 | 2: @ x8 cells |
| 326 | and r1, r0, #0x3f00 @ col |
| 327 | and r2, r0, #0x00fc @ row |
| 328 | orr r2, r2, #0x0600 |
| 329 | orr r1, r2, r1, ror #12 |
| 330 | b 9f |
| 331 | 3: @ x4 cells |
| 332 | and r1, r0, #0x1f80 @ col |
| 333 | and r2, r0, #0x007c @ row |
| 334 | orr r1, r2, r1, ror #11 |
| 335 | and r2, r0,#0x1e000 |
| 336 | orr r1, r1, r2, lsr #6 |
| 337 | b 9f |
| 338 | 0: @ x32 cells |
| 339 | and r1, r0, #0xfc00 @ col |
| 340 | and r2, r0, #0x03fc @ row |
| 341 | orr r1, r2, r1, ror #14 |
| 342 | 9: |
| 343 | and r0, r0, #3 |
| 344 | orr r0, r0, r1, ror #26 @ rol 4+2 |
| 345 | .endm |
| 346 | |
| 347 | |
| 348 | @ r0=prt1, r1=ptr2; unaligned ptr MUST be r0 |
| 349 | .macro m_read32_gen |
| 350 | tst r0, #2 |
| 351 | ldrneh r0, [r1, r0]! |
| 352 | ldrneh r1, [r1, #2] |
| 353 | ldreq r0, [r1, r0] |
| 354 | moveq r0, r0, ror #16 |
| 355 | orrne r0, r1, r0, lsl #16 |
| 356 | .endm |
| 357 | |
| 358 | |
| 359 | @ r0=prt1, r1=data, r2=ptr2; unaligned ptr MUST be r0 |
| 360 | .macro m_write32_gen |
| 361 | tst r0, #2 |
| 362 | mov r1, r1, ror #16 |
| 363 | strneh r1, [r2, r0]! |
| 364 | movne r1, r1, lsr #16 |
| 365 | strneh r1, [r2, #2] |
| 366 | streq r1, [r2, r0] |
| 367 | .endm |
| 368 | |
| 369 | @ |
| 370 | .macro bcram_reg_rw is_read addr_check |
| 371 | rsb r0, r0, #0x800000 |
| 372 | ldr r2, =(Pico+0x22200) |
| 373 | cmp r0, #(0x800000-\addr_check) |
| 374 | ldreq r2, [r2] |
| 375 | .if \is_read |
| 376 | movne r0, #0 |
| 377 | .endif |
| 378 | bxne lr |
| 379 | add r2, r2, #0x110000 |
| 380 | add r2, r2, #0x002200 |
| 381 | .if \is_read |
| 382 | ldrb r0, [r2, #0x18] |
| 383 | .else |
| 384 | strb r1, [r2, #0x18] |
| 385 | .endif |
| 386 | bx lr |
| 387 | .endm |
| 388 | |
| 389 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 390 | |
| 391 | |
| 392 | m_read_null: |
| 393 | mov r0, #0 |
| 394 | bx lr |
| 395 | |
| 396 | |
| 397 | m_m68k_read8_bios: |
| 398 | ldr r1, =(Pico+0x22200) |
| 399 | bic r0, r0, #0xfe0000 |
| 400 | ldr r1, [r1] |
| 401 | eor r0, r0, #1 |
| 402 | ldrb r0, [r1, r0] |
| 403 | bx lr |
| 404 | |
| 405 | |
| 406 | m_m68k_read8_prgbank: |
| 407 | ldr r1, =(Pico+0x22200) |
| 408 | eor r0, r0, #1 |
| 409 | ldr r1, [r1] |
| 410 | mov r2, #0x110000 |
| 411 | orr r3, r2, #0x002200 |
| 412 | ldr r3, [r1, r3] |
| 413 | ldr r2, [r1, r2] |
| 414 | and r3, r3, #0x00030000 |
| 415 | cmp r3, #0x00010000 @ have bus or in reset state? |
| 416 | moveq r0, #0 |
| 417 | bxeq lr |
| 418 | and r2, r2, #0xc0000000 @ r3 & 0xC0 |
| 419 | add r1, r1, r2, lsr #12 |
| 420 | ldrb r0, [r1, r0] |
| 421 | bx lr |
| 422 | |
| 423 | |
| 424 | m_m68k_read8_wordram0_2M: @ 0x200000 - 0x21ffff |
| 425 | m_m68k_read8_wordram1_2M: @ 0x220000 - 0x23ffff |
| 426 | ldr r1, =(Pico+0x22200) |
| 427 | sub r0, r0, #0x160000 @ map to our offset, which is 0x0a0000 |
| 428 | ldr r1, [r1] |
| 429 | eor r0, r0, #1 |
| 430 | ldrb r0, [r1, r0] |
| 431 | bx lr |
| 432 | |
| 433 | |
| 434 | m_m68k_read8_wordram0_1M_b0: @ 0x200000 - 0x21ffff |
| 435 | ldr r1, =(Pico+0x22200) |
| 436 | sub r0, r0, #0x140000 @ map to our offset, which is 0x0c0000 |
| 437 | ldr r1, [r1] |
| 438 | eor r0, r0, #1 |
| 439 | ldrb r0, [r1, r0] |
| 440 | bx lr |
| 441 | |
| 442 | |
| 443 | m_m68k_read8_wordram0_1M_b1: @ 0x200000 - 0x21ffff |
| 444 | ldr r1, =(Pico+0x22200) |
| 445 | sub r0, r0, #0x120000 @ map to our offset, which is 0x0e0000 |
| 446 | ldr r1, [r1] |
| 447 | eor r0, r0, #1 |
| 448 | ldrb r0, [r1, r0] |
| 449 | bx lr |
| 450 | |
| 451 | |
| 452 | m_m68k_read8_wordram1_1M_b0: @ 0x220000 - 0x23ffff, cell arranged |
| 453 | cell_map |
| 454 | ldr r1, =(Pico+0x22200) |
| 455 | add r0, r0, #0x0c0000 |
| 456 | ldr r1, [r1] |
| 457 | eor r0, r0, #1 |
| 458 | ldrb r0, [r1, r0] |
| 459 | bx lr |
| 460 | |
| 461 | |
| 462 | m_m68k_read8_wordram1_1M_b1: @ 0x220000 - 0x23ffff, cell arranged |
| 463 | cell_map |
| 464 | ldr r1, =(Pico+0x22200) |
| 465 | add r0, r0, #0x0e0000 |
| 466 | ldr r1, [r1] |
| 467 | eor r0, r0, #1 |
| 468 | ldrb r0, [r1, r0] |
| 469 | bx lr |
| 470 | |
| 471 | |
| 472 | m_m68k_read8_bcram_size: @ 0x400000 |
| 473 | sub r0, r0, #1 |
| 474 | cmp r0, #0x400000 |
| 475 | ldreq r1, =SRam |
| 476 | mov r0, #0 |
| 477 | ldreq r1, [r1] |
| 478 | bxne lr |
| 479 | tst r1, r1 |
| 480 | movne r0, #3 @ pretend to be a 64k cart (8<<3) |
| 481 | bx lr |
| 482 | |
| 483 | |
| 484 | m_m68k_read8_bcram: @ 0x600000 - 0x61ffff |
| 485 | ldr r1, =SRam |
| 486 | bic r0, r0, #0xfe0000 |
| 487 | ldr r1, [r1] |
| 488 | mov r0, r0, lsr #1 |
| 489 | tst r1, r1 |
| 490 | moveq r0, #0 |
| 491 | bxeq lr |
| 492 | add r1, r1, #0x2000 |
| 493 | ldrb r0, [r1, r0] |
| 494 | bx lr |
| 495 | |
| 496 | |
| 497 | m_m68k_read8_bcram_reg: @ 0x7fffff |
| 498 | bcram_reg_rw 1, 0x7fffff |
| 499 | |
| 500 | |
| 501 | m_m68k_read8_system_io: |
| 502 | bic r2, r0, #0xfe0000 |
| 503 | bic r2, r2, #0x3f |
| 504 | cmp r2, #0x012000 |
| 505 | bne m_m68k_read8_misc |
| 506 | |
| 507 | ldr r1, =(Pico+0x22200) |
| 508 | and r0, r0, #0x3f |
| 509 | ldr r1, [r1] @ Pico.mcd (used everywhere) |
| 510 | cmp r0, #0x0e |
| 511 | ldrlt pc, [pc, r0, lsl #2] |
| 512 | b m_m68k_read8_hi |
| 513 | .long m_m68k_read8_r00 |
| 514 | .long m_m68k_read8_r01 |
| 515 | .long m_m68k_read8_r02 |
| 516 | .long m_m68k_read8_r03 |
| 517 | .long m_m68k_read8_r04 |
| 518 | .long m_read_null @ unused bits |
| 519 | .long m_m68k_read8_r06 |
| 520 | .long m_m68k_read8_r07 |
| 521 | .long m_m68k_read8_r08 |
| 522 | .long m_m68k_read8_r09 |
| 523 | .long m_read_null @ reserved |
| 524 | .long m_read_null |
| 525 | .long m_m68k_read8_r0c |
| 526 | .long m_m68k_read8_r0d |
| 527 | m_m68k_read8_r00: |
| 528 | add r1, r1, #0x110000 |
| 529 | ldr r0, [r1, #0x30] |
| 530 | and r0, r0, #0x04000000 @ we need irq2 mask state |
| 531 | mov r0, r0, lsr #19 |
| 532 | bx lr |
| 533 | m_m68k_read8_r01: |
| 534 | add r1, r1, #0x110000 |
| 535 | add r1, r1, #0x002200 |
| 536 | ldrb r0, [r1, #2] @ Pico_mcd->m.busreq |
| 537 | bx lr |
| 538 | m_m68k_read8_r02: |
| 539 | add r1, r1, #0x110000 |
| 540 | ldrb r0, [r1, #2] |
| 541 | bx lr |
| 542 | m_m68k_read8_r03: |
| 543 | add r1, r1, #0x110000 |
| 544 | ldrb r0, [r1, #3] |
| 545 | add r1, r1, #0x002200 |
| 546 | ldr r1, [r1, #4] |
| 547 | and r0, r0, #0xc7 |
| 548 | tst r1, #2 @ DMNA pending? |
| 549 | bxeq lr |
| 550 | bic r0, r0, #1 |
| 551 | orr r0, r0, #2 |
| 552 | bx lr |
| 553 | m_m68k_read8_r04: |
| 554 | add r1, r1, #0x110000 |
| 555 | ldrb r0, [r1, #4] |
| 556 | bx lr |
| 557 | m_m68k_read8_r06: |
| 558 | ldrb r0, [r1, #0x73] @ IRQ vector |
| 559 | bx lr |
| 560 | m_m68k_read8_r07: |
| 561 | ldrb r0, [r1, #0x72] |
| 562 | bx lr |
| 563 | m_m68k_read8_r08: |
| 564 | mov r0, #0 |
| 565 | bl Read_CDC_Host @ TODO: make it local |
| 566 | mov r0, r0, lsr #8 |
| 567 | bx lr |
| 568 | m_m68k_read8_r09: |
| 569 | mov r0, #0 |
| 570 | b Read_CDC_Host |
| 571 | m_m68k_read8_r0c: |
| 572 | add r1, r1, #0x110000 |
| 573 | add r1, r1, #0x002200 |
| 574 | ldr r0, [r1, #0x14] @ Pico_mcd->m.timer_stopwatch |
| 575 | mov r0, r0, lsr #24 |
| 576 | bx lr |
| 577 | m_m68k_read8_r0d: |
| 578 | add r1, r1, #0x110000 |
| 579 | add r1, r1, #0x002200 |
| 580 | ldr r0, [r1, #0x14] |
| 581 | mov r0, r0, lsr #16 |
| 582 | bx lr |
| 583 | m_m68k_read8_hi: |
| 584 | cmp r0, #0x30 |
| 585 | movge r0, #0 |
| 586 | bxeq lr |
| 587 | add r1, r1, #0x110000 |
| 588 | ldrb r0, [r1, r0] |
| 589 | bx lr |
| 590 | |
| 591 | |
| 592 | m_m68k_read8_misc: |
| 593 | bic r2, r0, #0x00ff |
| 594 | bic r2, r2, #0xbf00 |
| 595 | cmp r2, #0xa00000 @ Z80 RAM? |
| 596 | beq z80Read8 |
| 597 | @ ldreq r2, =z80Read8 |
| 598 | @ bxeq r2 |
| 599 | stmfd sp!,{r0,lr} |
| 600 | bic r0, r0, #1 |
| 601 | mov r1, #8 |
| 602 | bl OtherRead16 @ non-MCD version should be ok too |
| 603 | ldmfd sp!,{r1,lr} |
| 604 | tst r1, #1 |
| 605 | moveq r0, r0, lsr #8 |
| 606 | bx lr |
| 607 | |
| 608 | |
| 609 | m_m68k_read8_vdp: |
| 610 | tst r0, #0x70000 |
| 611 | tsteq r0, #0x000e0 |
| 612 | bxne lr @ invalid read |
| 613 | stmfd sp!,{r0,lr} |
| 614 | bic r0, r0, #1 |
| 615 | bl PicoVideoRead @ TODO: implement it in asm |
| 616 | ldmfd sp!,{r1,lr} |
| 617 | tst r1, #1 |
| 618 | moveq r0, r0, lsr #8 |
| 619 | bx lr |
| 620 | |
| 621 | |
| 622 | m_m68k_read8_ram: |
| 623 | ldr r1, =Pico |
| 624 | bic r0, r0, #0xff0000 |
| 625 | eor r0, r0, #1 |
| 626 | ldrb r0, [r1, r0] |
| 627 | bx lr |
| 628 | |
| 629 | |
| 630 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 631 | |
| 632 | |
| 633 | m_m68k_read16_bios: |
| 634 | ldr r1, =(Pico+0x22200) |
| 635 | bic r0, r0, #0xfe0000 |
| 636 | ldr r1, [r1] |
| 637 | bic r0, r0, #1 |
| 638 | ldrh r0, [r1, r0] |
| 639 | bx lr |
| 640 | |
| 641 | |
| 642 | m_m68k_read16_prgbank: |
| 643 | ldr r1, =(Pico+0x22200) |
| 644 | bic r0, r0, #1 |
| 645 | ldr r1, [r1] |
| 646 | mov r2, #0x110000 |
| 647 | orr r3, r2, #0x002200 |
| 648 | ldr r3, [r1, r3] |
| 649 | ldr r2, [r1, r2] |
| 650 | and r3, r3, #0x00030000 |
| 651 | cmp r3, #0x00010000 @ have bus or in reset state? |
| 652 | moveq r0, #0 |
| 653 | bxeq lr |
| 654 | and r2, r2, #0xc0000000 @ r3 & 0xC0 |
| 655 | add r1, r1, r2, lsr #12 |
| 656 | ldrh r0, [r1, r0] |
| 657 | bx lr |
| 658 | |
| 659 | |
| 660 | m_m68k_read16_wordram0_2M: @ 0x200000 - 0x21ffff |
| 661 | m_m68k_read16_wordram1_2M: @ 0x220000 - 0x23ffff |
| 662 | ldr r1, =(Pico+0x22200) |
| 663 | sub r0, r0, #0x160000 @ map to our offset, which is 0x0a0000 |
| 664 | ldr r1, [r1] |
| 665 | bic r0, r0, #1 |
| 666 | ldrh r0, [r1, r0] |
| 667 | bx lr |
| 668 | |
| 669 | |
| 670 | m_m68k_read16_wordram0_1M_b0: @ 0x200000 - 0x21ffff |
| 671 | ldr r1, =(Pico+0x22200) |
| 672 | sub r0, r0, #0x140000 @ map to our offset, which is 0x0c0000 |
| 673 | ldr r1, [r1] |
| 674 | bic r0, r0, #1 |
| 675 | ldrh r0, [r1, r0] |
| 676 | bx lr |
| 677 | |
| 678 | |
| 679 | m_m68k_read16_wordram0_1M_b1: @ 0x200000 - 0x21ffff |
| 680 | ldr r1, =(Pico+0x22200) |
| 681 | sub r0, r0, #0x120000 @ map to our offset, which is 0x0e0000 |
| 682 | ldr r1, [r1] |
| 683 | bic r0, r0, #1 |
| 684 | ldrh r0, [r1, r0] |
| 685 | bx lr |
| 686 | |
| 687 | |
| 688 | m_m68k_read16_wordram1_1M_b0: @ 0x220000 - 0x23ffff, cell arranged |
| 689 | @ Warning: read32 relies on NOT using r3 and r12 here |
| 690 | cell_map |
| 691 | ldr r1, =(Pico+0x22200) |
| 692 | add r0, r0, #0x0c0000 |
| 693 | ldr r1, [r1] |
| 694 | bic r0, r0, #1 |
| 695 | ldrh r0, [r1, r0] |
| 696 | bx lr |
| 697 | |
| 698 | |
| 699 | m_m68k_read16_wordram1_1M_b1: @ 0x220000 - 0x23ffff, cell arranged |
| 700 | cell_map |
| 701 | ldr r1, =(Pico+0x22200) |
| 702 | add r0, r0, #0x0e0000 |
| 703 | ldr r1, [r1] |
| 704 | bic r0, r0, #1 |
| 705 | ldrh r0, [r1, r0] |
| 706 | bx lr |
| 707 | |
| 708 | |
| 709 | m_m68k_read16_bcram_size: @ 0x400000 |
| 710 | cmp r0, #0x400000 |
| 711 | ldreq r1, =SRam |
| 712 | mov r0, #0 |
| 713 | ldreq r1, [r1] |
| 714 | bxne lr |
| 715 | tst r1, r1 |
| 716 | movne r0, #3 @ pretend to be a 64k cart |
| 717 | bx lr |
| 718 | |
| 719 | |
| 720 | @ m_m68k_read16_bcram: @ 0x600000 - 0x61ffff |
| 721 | .equiv m_m68k_read16_bcram, m_m68k_read8_bcram |
| 722 | |
| 723 | |
| 724 | m_m68k_read16_bcram_reg: @ 0x7fffff |
| 725 | bcram_reg_rw 1, 0x7ffffe |
| 726 | |
| 727 | |
| 728 | m_m68k_read16_system_io: |
| 729 | bic r1, r0, #0xfe0000 |
| 730 | bic r1, r1, #0x3f |
| 731 | cmp r1, #0x012000 |
| 732 | bne m_m68k_read16_misc |
| 733 | |
| 734 | m_m68k_read16_m68k_regs: |
| 735 | ldr r1, =(Pico+0x22200) |
| 736 | and r0, r0, #0x3e |
| 737 | ldr r1, [r1] @ Pico.mcd (used everywhere) |
| 738 | cmp r0, #0x0e |
| 739 | ldrlt pc, [pc, r0, lsl #1] |
| 740 | b m_m68k_read16_hi |
| 741 | .long m_m68k_read16_r00 |
| 742 | .long m_m68k_read16_r02 |
| 743 | .long m_m68k_read16_r04 |
| 744 | .long m_m68k_read16_r06 |
| 745 | .long m_m68k_read16_r08 |
| 746 | .long m_read_null @ reserved |
| 747 | .long m_m68k_read16_r0c |
| 748 | m_m68k_read16_r00: |
| 749 | add r1, r1, #0x110000 |
| 750 | ldr r0, [r1, #0x30] |
| 751 | add r1, r1, #0x002200 |
| 752 | ldrb r1, [r1, #2] @ Pico_mcd->m.busreq |
| 753 | and r0, r0, #0x04000000 @ we need irq2 mask state |
| 754 | orr r0, r1, r0, lsr #11 |
| 755 | bx lr |
| 756 | m_m68k_read16_r02: |
| 757 | add r1, r1, #0x110000 |
| 758 | ldrb r0, [r1, #2] |
| 759 | ldrb r2, [r1, #3] |
| 760 | add r1, r1, #0x002200 |
| 761 | ldr r1, [r1, #4] |
| 762 | and r2, r2, #0xc7 |
| 763 | orr r0, r2, r0, lsl #8 |
| 764 | tst r1, #2 @ DMNA pending? |
| 765 | bxeq lr |
| 766 | bic r0, r0, #1 |
| 767 | orr r0, r0, #2 |
| 768 | bx lr |
| 769 | m_m68k_read16_r04: |
| 770 | add r1, r1, #0x110000 |
| 771 | ldrb r0, [r1, #4] |
| 772 | mov r0, r0, lsl #8 |
| 773 | bx lr |
| 774 | m_m68k_read16_r06: |
| 775 | ldrh r0, [r1, #0x72] @ IRQ vector |
| 776 | bx lr |
| 777 | m_m68k_read16_r08: |
| 778 | mov r0, #0 |
| 779 | b Read_CDC_Host |
| 780 | m_m68k_read16_r0c: |
| 781 | add r1, r1, #0x110000 |
| 782 | add r1, r1, #0x002200 |
| 783 | ldr r0, [r1, #0x14] |
| 784 | mov r0, r0, lsr #16 |
| 785 | bx lr |
| 786 | m_m68k_read16_hi: |
| 787 | cmp r0, #0x30 |
| 788 | addlt r1, r1, #0x110000 |
| 789 | ldrlth r1, [r1, r0] |
| 790 | movge r0, #0 |
| 791 | bxge lr |
| 792 | mov r0, r1, lsr #8 |
| 793 | and r1, r1, #0xff |
| 794 | orr r0, r0, r1, lsl #8 |
| 795 | bx lr |
| 796 | |
| 797 | |
| 798 | m_m68k_read16_misc: |
| 799 | bic r0, r0, #1 |
| 800 | mov r1, #16 |
| 801 | b OtherRead16 |
| 802 | |
| 803 | |
| 804 | m_m68k_read16_vdp: |
| 805 | tst r0, #0x70000 |
| 806 | tsteq r0, #0x000e0 |
| 807 | bxne lr @ invalid read |
| 808 | bic r0, r0, #1 |
| 809 | b PicoVideoRead |
| 810 | |
| 811 | |
| 812 | m_m68k_read16_ram: |
| 813 | ldr r1, =Pico |
| 814 | bic r0, r0, #0xff0000 |
| 815 | bic r0, r0, #1 |
| 816 | ldrh r0, [r1, r0] |
| 817 | bx lr |
| 818 | |
| 819 | |
| 820 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 821 | |
| 822 | |
| 823 | m_m68k_read32_bios: |
| 824 | ldr r1, =(Pico+0x22200) |
| 825 | bic r0, r0, #0xfe0000 |
| 826 | ldr r1, [r1] |
| 827 | bic r0, r0, #1 |
| 828 | m_read32_gen |
| 829 | bx lr |
| 830 | |
| 831 | |
| 832 | m_m68k_read32_prgbank: |
| 833 | ldr r1, =(Pico+0x22200) |
| 834 | bic r0, r0, #1 |
| 835 | ldr r1, [r1] |
| 836 | mov r2, #0x110000 |
| 837 | orr r3, r2, #0x002200 |
| 838 | ldr r3, [r1, r3] |
| 839 | ldr r2, [r1, r2] |
| 840 | and r3, r3, #0x00030000 |
| 841 | cmp r3, #0x00010000 @ have bus or in reset state? |
| 842 | moveq r0, #0 |
| 843 | bxeq lr |
| 844 | and r2, r2, #0xc0000000 @ r3 & 0xC0 |
| 845 | add r1, r1, r2, lsr #12 |
| 846 | m_read32_gen |
| 847 | bx lr |
| 848 | |
| 849 | |
| 850 | m_m68k_read32_wordram0_2M: @ 0x200000 - 0x21ffff |
| 851 | m_m68k_read32_wordram1_2M: @ 0x220000 - 0x23ffff |
| 852 | ldr r1, =(Pico+0x22200) |
| 853 | sub r0, r0, #0x160000 @ map to our offset, which is 0x0a0000 |
| 854 | ldr r1, [r1] |
| 855 | bic r0, r0, #1 |
| 856 | m_read32_gen |
| 857 | bx lr |
| 858 | |
| 859 | |
| 860 | m_m68k_read32_wordram0_1M_b0: @ 0x200000 - 0x21ffff |
| 861 | ldr r1, =(Pico+0x22200) |
| 862 | sub r0, r0, #0x140000 @ map to our offset, which is 0x0c0000 |
| 863 | ldr r1, [r1] |
| 864 | bic r0, r0, #1 |
| 865 | m_read32_gen |
| 866 | bx lr |
| 867 | |
| 868 | |
| 869 | m_m68k_read32_wordram0_1M_b1: @ 0x200000 - 0x21ffff |
| 870 | ldr r1, =(Pico+0x22200) |
| 871 | sub r0, r0, #0x120000 @ map to our offset, which is 0x0e0000 |
| 872 | ldr r1, [r1] |
| 873 | bic r0, r0, #1 |
| 874 | m_read32_gen |
| 875 | bx lr |
| 876 | |
| 877 | |
| 878 | m_m68k_read32_wordram1_1M_b0: @ 0x220000 - 0x23ffff, cell arranged |
| 879 | tst r0, #2 |
| 880 | bne m_m68k_read32_wordram1_1M_b0_unal |
| 881 | cell_map |
| 882 | ldr r1, =(Pico+0x22200) |
| 883 | add r0, r0, #0x0c0000 |
| 884 | ldr r1, [r1] |
| 885 | bic r0, r0, #1 |
| 886 | m_read32_gen |
| 887 | bx lr |
| 888 | m_m68k_read32_wordram1_1M_b0_unal: |
| 889 | @ hopefully this doesn't happen too often |
| 890 | mov r12,lr |
| 891 | mov r3, r0 |
| 892 | bl m_m68k_read16_wordram1_1M_b0 @ must not trash r12 and r3 |
| 893 | add r1, r3, #2 |
| 894 | mov r3, r0 |
| 895 | mov r0, r1 |
| 896 | bl m_m68k_read16_wordram1_1M_b0 |
| 897 | orr r0, r0, r3, lsl #16 |
| 898 | bx r12 |
| 899 | |
| 900 | |
| 901 | m_m68k_read32_wordram1_1M_b1: @ 0x220000 - 0x23ffff, cell arranged |
| 902 | tst r0, #2 |
| 903 | bne m_m68k_read32_wordram1_1M_b1_unal |
| 904 | cell_map |
| 905 | ldr r1, =(Pico+0x22200) |
| 906 | add r0, r0, #0x0e0000 |
| 907 | ldr r1, [r1] |
| 908 | bic r0, r0, #1 |
| 909 | m_read32_gen |
| 910 | bx lr |
| 911 | m_m68k_read32_wordram1_1M_b1_unal: |
| 912 | mov r12,lr |
| 913 | mov r3, r0 |
| 914 | bl m_m68k_read16_wordram1_1M_b1 @ must not trash r12 and r3 |
| 915 | add r1, r3, #2 |
| 916 | mov r3, r0 |
| 917 | mov r0, r1 |
| 918 | bl m_m68k_read16_wordram1_1M_b1 |
| 919 | orr r0, r0, r3, lsl #16 |
| 920 | bx r12 |
| 921 | |
| 922 | |
| 923 | m_m68k_read32_bcram_size: @ 0x400000 |
| 924 | cmp r0, #0x400000 |
| 925 | ldreq r1, =SRam |
| 926 | mov r0, #0 |
| 927 | ldreq r1, [r1] |
| 928 | bxne lr |
| 929 | tst r1, r1 |
| 930 | movne r0, #0x30000 @ pretend to be a 64k cart |
| 931 | bx lr |
| 932 | |
| 933 | |
| 934 | m_m68k_read32_bcram: @ 0x600000 - 0x61ffff, not likely to be called |
| 935 | mov r12,lr |
| 936 | add r3, r0, #2 |
| 937 | bl m_m68k_read8_bcram |
| 938 | mov r1, r0 |
| 939 | mov r0, r3 |
| 940 | mov r3, r1 |
| 941 | bl m_m68k_read8_bcram |
| 942 | orr r0, r0, r3, lsl #16 |
| 943 | bx r12 |
| 944 | |
| 945 | |
| 946 | m_m68k_read32_bcram_reg: @ 0x7fffff |
| 947 | bcram_reg_rw 1, 0x7ffffc |
| 948 | |
| 949 | |
| 950 | @ it is not very practical to use long access on hw registers, so I assume it is not used too much. |
| 951 | m_m68k_read32_system_io: |
| 952 | bic r1, r0, #0xfe0000 |
| 953 | bic r1, r1, #0x3f |
| 954 | cmp r1, #0x012000 |
| 955 | bne m_m68k_read32_misc |
| 956 | and r1, r0, #0x3e |
| 957 | cmp r1, #0x0e |
| 958 | blt m_m68k_read32_misc |
| 959 | cmp r1, #0x30 |
| 960 | movge r0, #0 |
| 961 | bxge lr |
| 962 | @ I have seen the range 0x0e-0x2f accessed quite frequently with long i/o, so here is some code for that |
| 963 | mov r0, r1 |
| 964 | ldr r1, =(Pico+0x22200) |
| 965 | mov r2, #0xff |
| 966 | ldr r1, [r1] |
| 967 | orr r2, r2, r2, lsl #16 |
| 968 | add r1, r1, #0x110000 |
| 969 | m_read32_gen |
| 970 | and r1, r2, r0 @ data is big-endian read as little, have to byteswap |
| 971 | and r0, r2, r0, lsr #8 |
| 972 | orr r0, r0, r1, lsl #8 |
| 973 | bx lr |
| 974 | |
| 975 | m_m68k_read32_misc: |
| 976 | add r1, r0, #2 |
| 977 | stmfd sp!,{r1,lr} |
| 978 | bl m_m68k_read16_system_io |
| 979 | swp r0, r0, [sp] |
| 980 | bl m_m68k_read16_system_io |
| 981 | ldmfd sp!,{r1,lr} |
| 982 | orr r0, r0, r1, lsl #16 |
| 983 | bx lr |
| 984 | |
| 985 | |
| 986 | m_m68k_read32_vdp: |
| 987 | tst r0, #0x70000 |
| 988 | tsteq r0, #0x000e0 |
| 989 | bxne lr @ invalid read |
| 990 | bic r0, r0, #1 |
| 991 | add r1, r0, #2 |
| 992 | stmfd sp!,{r1,lr} |
| 993 | bl PicoVideoRead |
| 994 | swp r0, r0, [sp] |
| 995 | bl PicoVideoRead |
| 996 | ldmfd sp!,{r1,lr} |
| 997 | orr r0, r0, r1, lsl #16 |
| 998 | bx lr |
| 999 | |
| 1000 | |
| 1001 | m_m68k_read32_ram: |
| 1002 | ldr r1, =Pico |
| 1003 | bic r0, r0, #0xff0000 |
| 1004 | bic r0, r0, #1 |
| 1005 | m_read32_gen |
| 1006 | bx lr |
| 1007 | |
| 1008 | .pool |
| 1009 | |
| 1010 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 1011 | |
| 1012 | |
| 1013 | m_write_null: |
| 1014 | m_m68k_write8_bios: |
| 1015 | m_m68k_write8_bcram_size: @ 0x400000 |
| 1016 | bx lr |
| 1017 | |
| 1018 | |
| 1019 | m_m68k_write8_prgbank: |
| 1020 | ldr r2, =(Pico+0x22200) |
| 1021 | eor r0, r0, #1 |
| 1022 | ldr r2, [r2] |
| 1023 | mov r12,#0x110000 |
| 1024 | orr r3, r12, #0x002200 |
| 1025 | ldr r3, [r2, r3] |
| 1026 | ldr r12,[r2, r12] |
| 1027 | and r3, r3, #0x00030000 |
| 1028 | cmp r3, #0x00010000 @ have bus or in reset state? |
| 1029 | bxeq lr |
| 1030 | and r12,r12,#0xc0000000 @ r3 & 0xC0 |
| 1031 | add r2, r2, r12, lsr #12 |
| 1032 | strb r1, [r2, r0] |
| 1033 | bx lr |
| 1034 | |
| 1035 | |
| 1036 | m_m68k_write8_wordram0_2M: @ 0x200000 - 0x21ffff |
| 1037 | m_m68k_write8_wordram1_2M: @ 0x220000 - 0x23ffff |
| 1038 | ldr r2, =(Pico+0x22200) |
| 1039 | sub r0, r0, #0x160000 @ map to our offset, which is 0x0a0000 |
| 1040 | ldr r2, [r2] |
| 1041 | eor r0, r0, #1 |
| 1042 | strb r1, [r2, r0] |
| 1043 | bx lr |
| 1044 | |
| 1045 | |
| 1046 | m_m68k_write8_wordram0_1M_b0: @ 0x200000 - 0x21ffff |
| 1047 | ldr r2, =(Pico+0x22200) |
| 1048 | sub r0, r0, #0x140000 @ map to our offset, which is 0x0c0000 |
| 1049 | ldr r2, [r2] |
| 1050 | eor r0, r0, #1 |
| 1051 | strb r1, [r2, r0] |
| 1052 | bx lr |
| 1053 | |
| 1054 | |
| 1055 | m_m68k_write8_wordram0_1M_b1: @ 0x200000 - 0x21ffff |
| 1056 | ldr r2, =(Pico+0x22200) |
| 1057 | sub r0, r0, #0x120000 @ map to our offset, which is 0x0e0000 |
| 1058 | ldr r2, [r2] |
| 1059 | eor r0, r0, #1 |
| 1060 | strb r1, [r2, r0] |
| 1061 | bx lr |
| 1062 | |
| 1063 | |
| 1064 | m_m68k_write8_wordram1_1M_b0: @ 0x220000 - 0x23ffff, cell arranged |
| 1065 | mov r3, r1 |
| 1066 | cell_map |
| 1067 | ldr r2, =(Pico+0x22200) |
| 1068 | add r0, r0, #0x0c0000 |
| 1069 | ldr r2, [r2] |
| 1070 | eor r0, r0, #1 |
| 1071 | strb r3, [r2, r0] |
| 1072 | bx lr |
| 1073 | |
| 1074 | |
| 1075 | m_m68k_write8_wordram1_1M_b1: @ 0x220000 - 0x23ffff, cell arranged |
| 1076 | mov r3, r1 |
| 1077 | cell_map |
| 1078 | ldr r2, =(Pico+0x22200) |
| 1079 | add r0, r0, #0x0e0000 |
| 1080 | ldr r2, [r2] |
| 1081 | eor r0, r0, #1 |
| 1082 | strb r3, [r2, r0] |
| 1083 | bx lr |
| 1084 | |
| 1085 | |
| 1086 | m_m68k_write8_bcram: @ 0x600000 - 0x61ffff |
| 1087 | @ can't use r3 or r12, because of write32 |
| 1088 | ldr r2, =SRam |
| 1089 | bic r0, r0, #0xfe0000 |
| 1090 | ldr r2, [r2] |
| 1091 | tst r2, r2 |
| 1092 | bxeq lr |
| 1093 | add r0, r2, r0, lsr #1 |
| 1094 | ldr r2, =(Pico+0x22200) |
| 1095 | ldr r2, [r2] |
| 1096 | add r0, r0, #0x2000 |
| 1097 | add r2, r2, #0x110000 |
| 1098 | add r2, r2, #0x002200 |
| 1099 | ldr r2, [r2, #0x18] |
| 1100 | tst r2, #1 @ check bcram reg |
| 1101 | bxeq lr |
| 1102 | strb r1, [r0] |
| 1103 | ldr r2, =SRam |
| 1104 | mov r0, #1 |
| 1105 | strb r0, [r2, #0x0e] @ SRam.changed = 1 |
| 1106 | bx lr |
| 1107 | |
| 1108 | |
| 1109 | m_m68k_write8_bcram_reg: @ 0x7fffff |
| 1110 | bcram_reg_rw 0, 0x7fffff |
| 1111 | |
| 1112 | |
| 1113 | m_m68k_write8_system_io: |
| 1114 | bic r2, r0, #0xfe0000 |
| 1115 | bic r2, r2, #0x3f |
| 1116 | cmp r2, #0x012000 |
| 1117 | beq m68k_reg_write8 |
| 1118 | mov r2, #8 |
| 1119 | b OtherWrite8 |
| 1120 | |
| 1121 | |
| 1122 | m_m68k_write8_vdp: |
| 1123 | tst r0, #0x70000 |
| 1124 | tsteq r0, #0x000e0 |
| 1125 | bxne lr @ invalid |
| 1126 | and r2, r0, #0x19 |
| 1127 | cmp r2, #0x11 |
| 1128 | andeq r0, r1, #0xff |
| 1129 | beq SN76496Write |
| 1130 | and r1, r1, #0xff |
| 1131 | orr r1, r1, r1, lsl #8 @ byte access gets mirrored |
| 1132 | b PicoVideoWrite |
| 1133 | |
| 1134 | |
| 1135 | m_m68k_write8_ram: |
| 1136 | ldr r2, =Pico |
| 1137 | bic r0, r0, #0xff0000 |
| 1138 | eor r0, r0, #1 |
| 1139 | strb r1, [r2, r0] |
| 1140 | bx lr |
| 1141 | |
| 1142 | |
| 1143 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 1144 | |
| 1145 | |
| 1146 | m_m68k_write16_bios: |
| 1147 | m_m68k_write16_bcram_size: @ 0x400000 |
| 1148 | bx lr |
| 1149 | |
| 1150 | |
| 1151 | m_m68k_write16_prgbank: |
| 1152 | ldr r2, =(Pico+0x22200) |
| 1153 | bic r0, r0, #1 |
| 1154 | ldr r2, [r2] |
| 1155 | mov r12,#0x110000 |
| 1156 | orr r3, r12, #0x002200 |
| 1157 | ldr r3, [r2, r3] |
| 1158 | ldr r12,[r2, r12] |
| 1159 | and r3, r3, #0x00030000 |
| 1160 | cmp r3, #0x00010000 @ have bus or in reset state? |
| 1161 | bxeq lr |
| 1162 | and r12,r12,#0xc0000000 @ r3 & 0xC0 |
| 1163 | add r2, r2, r12, lsr #12 |
| 1164 | strh r1, [r2, r0] |
| 1165 | bx lr |
| 1166 | |
| 1167 | |
| 1168 | m_m68k_write16_wordram0_2M: @ 0x200000 - 0x21ffff |
| 1169 | m_m68k_write16_wordram1_2M: @ 0x220000 - 0x23ffff |
| 1170 | ldr r2, =(Pico+0x22200) |
| 1171 | sub r0, r0, #0x160000 @ map to our offset, which is 0x0a0000 |
| 1172 | ldr r2, [r2] |
| 1173 | bic r0, r0, #1 |
| 1174 | strh r1, [r2, r0] |
| 1175 | bx lr |
| 1176 | |
| 1177 | |
| 1178 | m_m68k_write16_wordram0_1M_b0: @ 0x200000 - 0x21ffff |
| 1179 | ldr r2, =(Pico+0x22200) |
| 1180 | sub r0, r0, #0x140000 @ map to our offset, which is 0x0c0000 |
| 1181 | ldr r2, [r2] |
| 1182 | bic r0, r0, #1 |
| 1183 | strh r1, [r2, r0] |
| 1184 | bx lr |
| 1185 | |
| 1186 | |
| 1187 | m_m68k_write16_wordram0_1M_b1: @ 0x200000 - 0x21ffff |
| 1188 | ldr r2, =(Pico+0x22200) |
| 1189 | sub r0, r0, #0x120000 @ map to our offset, which is 0x0e0000 |
| 1190 | ldr r2, [r2] |
| 1191 | bic r0, r0, #1 |
| 1192 | strh r1, [r2, r0] |
| 1193 | bx lr |
| 1194 | |
| 1195 | |
| 1196 | m_m68k_write16_wordram1_1M_b0: @ 0x220000 - 0x23ffff, cell arranged |
| 1197 | @ Warning: write32 relies on NOT using r12 and and keeping data in r3 |
| 1198 | mov r3, r1 |
| 1199 | cell_map |
| 1200 | ldr r1, =(Pico+0x22200) |
| 1201 | add r0, r0, #0x0c0000 |
| 1202 | ldr r1, [r1] |
| 1203 | bic r0, r0, #1 |
| 1204 | strh r3, [r1, r0] |
| 1205 | bx lr |
| 1206 | |
| 1207 | |
| 1208 | m_m68k_write16_wordram1_1M_b1: @ 0x220000 - 0x23ffff, cell arranged |
| 1209 | mov r3, r1 |
| 1210 | cell_map |
| 1211 | ldr r1, =(Pico+0x22200) |
| 1212 | add r0, r0, #0x0e0000 |
| 1213 | ldr r1, [r1] |
| 1214 | bic r0, r0, #1 |
| 1215 | strh r3, [r1, r0] |
| 1216 | bx lr |
| 1217 | |
| 1218 | |
| 1219 | @ m_m68k_write16_bcram: @ 0x600000 - 0x61ffff |
| 1220 | .equiv m_m68k_write16_bcram, m_m68k_write8_bcram |
| 1221 | |
| 1222 | |
| 1223 | m_m68k_write16_bcram_reg: @ 0x7fffff |
| 1224 | bcram_reg_rw 0, 0x7ffffe |
| 1225 | |
| 1226 | |
| 1227 | m_m68k_write16_system_io: |
| 1228 | bic r0, r0, #1 |
| 1229 | bic r2, r0, #0xfe0000 |
| 1230 | bic r2, r2, #0x3f |
| 1231 | cmp r2, #0x012000 |
| 1232 | bne OtherWrite16 |
| 1233 | |
| 1234 | m_m68k_write16_regs: |
| 1235 | and r0, r0, #0x3e |
| 1236 | cmp r0, #0x0e |
| 1237 | beq m_m68k_write16_regs_spec |
| 1238 | and r3, r1, #0xff |
| 1239 | add r2, r0, #1 |
| 1240 | stmfd sp!,{r2,r3,lr} |
| 1241 | mov r1, r1, lsr #8 |
| 1242 | bl m68k_reg_write8 |
| 1243 | ldmfd sp!,{r0,r1,lr} |
| 1244 | b m68k_reg_write8 |
| 1245 | |
| 1246 | m_m68k_write16_regs_spec: @ special case |
| 1247 | ldr r2, =(Pico+0x22200) |
| 1248 | ldr r3, =s68k_poll_adclk |
| 1249 | mov r0, #0x110000 |
| 1250 | ldr r2, [r2] |
| 1251 | add r0, r0, #0x00000e |
| 1252 | mov r1, r1, lsr #8 |
| 1253 | strb r1, [r2, r0] @ if (a == 0xe) s68k_regs[0x0e] = d >> 8; |
| 1254 | ldr r2, [r3] |
| 1255 | mov r1, #0 |
| 1256 | and r2, r2, #0xfe |
| 1257 | cmp r2, #0x0e |
| 1258 | bxne lr |
| 1259 | ldr r0, =PicoCpuS68k |
| 1260 | str r1, [r0, #0x58] @ push s68k out of stopped state |
| 1261 | str r1, [r3] |
| 1262 | bx lr |
| 1263 | |
| 1264 | |
| 1265 | m_m68k_write16_vdp: |
| 1266 | tst r0, #0x70000 |
| 1267 | tsteq r0, #0x000e0 |
| 1268 | bxne lr @ invalid |
| 1269 | bic r0, r0, #1 |
| 1270 | and r2, r0, #0x18 |
| 1271 | cmp r2, #0x10 |
| 1272 | bne PicoVideoWrite |
| 1273 | and r0, r1, #0xff |
| 1274 | b SN76496Write @ lsb goes to 0x11 |
| 1275 | |
| 1276 | |
| 1277 | m_m68k_write16_ram: |
| 1278 | ldr r2, =Pico |
| 1279 | bic r0, r0, #0xff0000 |
| 1280 | bic r0, r0, #1 |
| 1281 | strh r1, [r2, r0] |
| 1282 | bx lr |
| 1283 | |
| 1284 | |
| 1285 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 1286 | |
| 1287 | |
| 1288 | m_m68k_write32_bios: |
| 1289 | m_m68k_write32_bcram_size: @ 0x400000 |
| 1290 | bx lr |
| 1291 | |
| 1292 | |
| 1293 | m_m68k_write32_prgbank: |
| 1294 | ldr r2, =(Pico+0x22200) |
| 1295 | bic r0, r0, #1 |
| 1296 | ldr r2, [r2] |
| 1297 | mov r12,#0x110000 |
| 1298 | orr r3, r12, #0x002200 |
| 1299 | ldr r3, [r2, r3] |
| 1300 | ldr r12,[r2, r12] |
| 1301 | and r3, r3, #0x00030000 |
| 1302 | cmp r3, #0x00010000 @ have bus or in reset state? |
| 1303 | bxeq lr |
| 1304 | and r12,r12,#0xc0000000 @ r3 & 0xC0 |
| 1305 | add r2, r2, r12, lsr #12 |
| 1306 | m_write32_gen |
| 1307 | bx lr |
| 1308 | |
| 1309 | |
| 1310 | m_m68k_write32_wordram0_2M: @ 0x200000 - 0x21ffff |
| 1311 | m_m68k_write32_wordram1_2M: @ 0x220000 - 0x23ffff |
| 1312 | ldr r2, =(Pico+0x22200) |
| 1313 | sub r0, r0, #0x160000 @ map to our offset, which is 0x0a0000 |
| 1314 | ldr r2, [r2] |
| 1315 | bic r0, r0, #1 |
| 1316 | m_write32_gen |
| 1317 | bx lr |
| 1318 | |
| 1319 | |
| 1320 | m_m68k_write32_wordram0_1M_b0: @ 0x200000 - 0x21ffff |
| 1321 | ldr r2, =(Pico+0x22200) |
| 1322 | sub r0, r0, #0x140000 @ map to our offset, which is 0x0c0000 |
| 1323 | ldr r2, [r2] |
| 1324 | bic r0, r0, #1 |
| 1325 | m_write32_gen |
| 1326 | bx lr |
| 1327 | |
| 1328 | |
| 1329 | m_m68k_write32_wordram0_1M_b1: @ 0x200000 - 0x21ffff |
| 1330 | ldr r2, =(Pico+0x22200) |
| 1331 | sub r0, r0, #0x120000 @ map to our offset, which is 0x0e0000 |
| 1332 | ldr r2, [r2] |
| 1333 | bic r0, r0, #1 |
| 1334 | m_write32_gen |
| 1335 | bx lr |
| 1336 | |
| 1337 | |
| 1338 | m_m68k_write32_wordram1_1M_b0: @ 0x220000 - 0x23ffff, cell arranged |
| 1339 | tst r0, #2 |
| 1340 | bne m_m68k_write32_wordram1_1M_b0_unal |
| 1341 | mov r3, r1 |
| 1342 | cell_map |
| 1343 | ldr r2, =(Pico+0x22200) |
| 1344 | add r0, r0, #0x0c0000 |
| 1345 | ldr r2, [r2] |
| 1346 | bic r0, r0, #1 |
| 1347 | mov r1, r3 |
| 1348 | m_write32_gen |
| 1349 | bx lr |
| 1350 | m_m68k_write32_wordram1_1M_b0_unal: |
| 1351 | @ hopefully this doesn't happen too often |
| 1352 | add r12,r0, #2 |
| 1353 | mov r1, r1, ror #16 |
| 1354 | stmfd sp!,{lr} |
| 1355 | bl m_m68k_write16_wordram1_1M_b0 @ must not trash r12 and keep data in r3 |
| 1356 | ldmfd sp!,{lr} |
| 1357 | mov r0, r12 |
| 1358 | mov r1, r3, lsr #16 |
| 1359 | b m_m68k_write16_wordram1_1M_b0 |
| 1360 | |
| 1361 | |
| 1362 | m_m68k_write32_wordram1_1M_b1: @ 0x220000 - 0x23ffff, cell arranged |
| 1363 | tst r0, #2 |
| 1364 | bne m_m68k_write32_wordram1_1M_b1_unal |
| 1365 | mov r3, r1 |
| 1366 | cell_map |
| 1367 | ldr r2, =(Pico+0x22200) |
| 1368 | add r0, r0, #0x0e0000 |
| 1369 | ldr r2, [r2] |
| 1370 | bic r0, r0, #1 |
| 1371 | mov r1, r3 |
| 1372 | m_write32_gen |
| 1373 | bx lr |
| 1374 | m_m68k_write32_wordram1_1M_b1_unal: |
| 1375 | add r12,r0, #2 |
| 1376 | mov r1, r1, ror #16 |
| 1377 | stmfd sp!,{lr} |
| 1378 | bl m_m68k_write16_wordram1_1M_b1 @ same as above |
| 1379 | ldmfd sp!,{lr} |
| 1380 | mov r0, r12 |
| 1381 | mov r1, r3, lsr #16 |
| 1382 | b m_m68k_write16_wordram1_1M_b1 |
| 1383 | |
| 1384 | |
| 1385 | m_m68k_write32_bcram: @ 0x600000 - 0x61ffff, not likely to be called |
| 1386 | mov r12,lr |
| 1387 | add r3, r0, #2 |
| 1388 | mov r1, r1, ror #16 |
| 1389 | bl m_m68k_write8_bcram |
| 1390 | mov r0, r3 |
| 1391 | mov r1, r1, ror #16 |
| 1392 | bl m_m68k_write8_bcram |
| 1393 | bx r12 |
| 1394 | |
| 1395 | |
| 1396 | m_m68k_write32_bcram_reg: @ 0x7fffff |
| 1397 | bcram_reg_rw 0, 0x7ffffc |
| 1398 | |
| 1399 | |
| 1400 | |
| 1401 | @ it is not very practical to use long access on hw registers, so I assume it is not used too much. |
| 1402 | m_m68k_write32_system_io: |
| 1403 | bic r2, r0, #0xfe0000 |
| 1404 | bic r2, r2, #0x3f |
| 1405 | cmp r2, #0x012000 |
| 1406 | bne m_m68k_write32_misc |
| 1407 | and r2, r0, #0x3e |
| 1408 | cmp r2, #0x20 |
| 1409 | bxge lr |
| 1410 | cmp r2, #0x10 |
| 1411 | bge m_m68k_write32_regs_comm |
| 1412 | cmp r2, #0x0c |
| 1413 | bge m_m68k_write32_regs_spec @ hits the nasty comm reg qiurk |
| 1414 | |
| 1415 | bic r0, r0, #1 |
| 1416 | stmfd sp!,{r0,r1,lr} |
| 1417 | mov r1, r1, lsr #24 |
| 1418 | bl m68k_reg_write8 |
| 1419 | ldr r0, [sp] |
| 1420 | ldr r1, [sp, #4] |
| 1421 | add r0, r0, #1 |
| 1422 | mov r1, r1, lsr #16 |
| 1423 | bl m68k_reg_write8 |
| 1424 | ldr r0, [sp] |
| 1425 | ldr r1, [sp, #4] |
| 1426 | add r0, r0, #2 |
| 1427 | mov r1, r1, lsr #8 |
| 1428 | bl m68k_reg_write8 |
| 1429 | ldmfd sp!,{r0,r1,lr} |
| 1430 | add r0, r0, #3 |
| 1431 | b m68k_reg_write8 |
| 1432 | |
| 1433 | m_m68k_write32_regs_comm: @ Handle the 0x10-0x1f range |
| 1434 | ldr r0, =(Pico+0x22200) |
| 1435 | mov r3, #0xff |
| 1436 | ldr r0, [r0] |
| 1437 | orr r3, r3, r3, lsl #16 |
| 1438 | add r0, r0, #0x110000 |
| 1439 | and r12,r3, r1, ror #16 @ data is big-endian to be written as little, have to byteswap |
| 1440 | and r1, r3, r1, ror #24 |
| 1441 | orr r1, r1, r12,lsl #8 @ end of byteswap |
| 1442 | cmp r2, #0x1e |
| 1443 | strh r1, [r2, r0]! |
| 1444 | ldr r3, =s68k_poll_adclk |
| 1445 | ldr r0, [r3] |
| 1446 | movne r1, r1, lsr #16 |
| 1447 | strneh r1, [r2, #2] |
| 1448 | cmp r0, #0x10 |
| 1449 | bxlt lr |
| 1450 | ldr r0, =PicoCpuS68k @ remove poll detected state for s68k |
| 1451 | mov r1, #0 |
| 1452 | str r1, [r0, #0x58] |
| 1453 | str r1, [r3] |
| 1454 | bx lr |
| 1455 | |
| 1456 | m_m68k_write32_misc: |
| 1457 | bic r0, r0, #1 |
| 1458 | stmfd sp!,{r0,r1,lr} |
| 1459 | mov r1, r1, lsr #16 |
| 1460 | bl OtherWrite16 |
| 1461 | ldmfd sp!,{r0,r1,lr} |
| 1462 | add r0, r0, #2 |
| 1463 | b OtherWrite16 |
| 1464 | |
| 1465 | m_m68k_write32_regs_spec: |
| 1466 | bic r0, r0, #1 |
| 1467 | stmfd sp!,{r0,r1,lr} |
| 1468 | mov r1, r1, lsr #16 |
| 1469 | bl m_m68k_write16_regs |
| 1470 | ldmfd sp!,{r0,r1,lr} |
| 1471 | add r0, r0, #2 |
| 1472 | b m_m68k_write16_regs |
| 1473 | |
| 1474 | |
| 1475 | m_m68k_write32_vdp: |
| 1476 | tst r0, #0x70000 |
| 1477 | tsteq r0, #0x000e0 |
| 1478 | bxne lr @ invalid |
| 1479 | and r2, r0, #0x18 |
| 1480 | cmp r2, #0x10 |
| 1481 | moveq r0, r1, lsr #16 |
| 1482 | beq SN76496Write @ which game is crazy enough to do that? |
| 1483 | stmfd sp!,{r0,r1,lr} |
| 1484 | mov r1, r1, lsr #16 |
| 1485 | bl PicoVideoWrite |
| 1486 | ldmfd sp!,{r0,r1,lr} |
| 1487 | add r0, r0, #2 |
| 1488 | b PicoVideoWrite |
| 1489 | |
| 1490 | |
| 1491 | m_m68k_write32_ram: |
| 1492 | ldr r2, =Pico |
| 1493 | bic r0, r0, #0xff0000 |
| 1494 | bic r0, r0, #1 |
| 1495 | m_write32_gen |
| 1496 | bx lr |
| 1497 | |
| 1498 | .pool |
| 1499 | |
| 1500 | |
| 1501 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 1502 | |
| 1503 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 1504 | |
| 1505 | |
| 1506 | .macro m_s68k_read8_ram map_addr |
| 1507 | ldr r1, =(Pico+0x22200) |
| 1508 | eor r0, r0, #1 |
| 1509 | ldr r1, [r1] |
| 1510 | .if \map_addr |
| 1511 | add r0, r0, #\map_addr @ map to our address |
| 1512 | .endif |
| 1513 | ldrb r0, [r1, r0] |
| 1514 | bx lr |
| 1515 | .endm |
| 1516 | |
| 1517 | .macro m_s68k_read8_wordram_2M_decode map_addr |
| 1518 | ldr r2, =(Pico+0x22200) |
| 1519 | eor r0, r0, #2 |
| 1520 | ldr r2, [r2] |
| 1521 | movs r0, r0, lsr #1 @ +4-6 <<16 |
| 1522 | add r2, r2, #\map_addr @ map to our address |
| 1523 | ldrb r0, [r2, r0] |
| 1524 | movcc r0, r0, lsr #4 |
| 1525 | andcs r0, r0, #0xf |
| 1526 | bx lr |
| 1527 | .endm |
| 1528 | |
| 1529 | |
| 1530 | m_s68k_read8_prg: @ 0x000000 - 0x07ffff |
| 1531 | m_s68k_read8_wordram_2M: @ 0x080000 - 0x0bffff |
| 1532 | m_s68k_read8_wordram_1M_b1: @ 0x0c0000 - 0x0dffff, maps to 0x0e0000 |
| 1533 | m_s68k_read8_ram 0x020000 |
| 1534 | |
| 1535 | |
| 1536 | m_s68k_read8_wordram_2M_decode_b0: @ 0x080000 - 0x0bffff |
| 1537 | m_s68k_read8_wordram_2M_decode 0x080000 @ + ^ / 2 |
| 1538 | |
| 1539 | |
| 1540 | m_s68k_read8_wordram_2M_decode_b1: @ 0x080000 - 0x0bffff |
| 1541 | m_s68k_read8_wordram_2M_decode 0x0a0000 @ + ^ / 2 |
| 1542 | |
| 1543 | |
| 1544 | m_s68k_read8_wordram_1M_b0: @ 0x0c0000 - 0x0dffff (same as our offset :) |
| 1545 | m_s68k_read8_ram 0 |
| 1546 | |
| 1547 | |
| 1548 | m_s68k_read8_backup: @ 0xfe0000 - 0xfe3fff (repeated?) |
| 1549 | @ must not trash r3 and r12 |
| 1550 | ldr r1, =(Pico+0x22200) |
| 1551 | mov r0, r0, lsr #1 |
| 1552 | ldr r1, [r1] |
| 1553 | bic r0, r0, #0xff0000 |
| 1554 | bic r0, r0, #0x00e000 |
| 1555 | add r1, r1, #0x110000 |
| 1556 | add r1, r1, #0x000200 |
| 1557 | ldrb r0, [r1, r0] |
| 1558 | bx lr |
| 1559 | |
| 1560 | |
| 1561 | m_s68k_read8_pcm: |
| 1562 | @ must not trash r3 and r12 |
| 1563 | ldr r1, =(Pico+0x22200) |
| 1564 | bic r0, r0, #0xff0000 |
| 1565 | @ bic r0, r0, #0x008000 |
| 1566 | ldr r1, [r1] |
| 1567 | mov r2, #0x110000 |
| 1568 | orr r2, r2, #0x002200 |
| 1569 | cmp r0, #0x2000 |
| 1570 | bge m_s68k_read8_pcm_ram |
| 1571 | cmp r0, #0x20 |
| 1572 | movlt r0, #0 |
| 1573 | bxlt lr |
| 1574 | orr r2, r2, #(0x48+8) @ pcm.ch + addr_offset |
| 1575 | add r1, r1, r2 |
| 1576 | and r2, r0, #0x1c |
| 1577 | ldr r1, [r1, r2, lsl #2] |
| 1578 | tst r0, #2 |
| 1579 | moveq r0, r1, lsr #PCM_STEP_SHIFT |
| 1580 | movne r0, r1, lsr #(PCM_STEP_SHIFT+8) |
| 1581 | and r0, r0, #0xff |
| 1582 | bx lr |
| 1583 | |
| 1584 | m_s68k_read8_pcm_ram: |
| 1585 | orr r2, r2, #0x40 |
| 1586 | ldr r2, [r1, r2] |
| 1587 | add r1, r1, #0x100000 @ pcm_ram |
| 1588 | and r2, r2, #0x0f000000 @ bank |
| 1589 | add r1, r1, r2, lsr #12 |
| 1590 | bic r0, r0, #0x00e000 |
| 1591 | mov r0, r0, lsr #1 |
| 1592 | ldrb r0, [r1, r0] |
| 1593 | bx lr |
| 1594 | |
| 1595 | |
| 1596 | m_s68k_read8_regs: |
| 1597 | bic r0, r0, #0xff0000 |
| 1598 | bic r0, r0, #0x008000 |
| 1599 | tst r0, #0x7e00 |
| 1600 | movne r0, #0 |
| 1601 | bxne lr |
| 1602 | sub r2, r0, #0x0e |
| 1603 | cmp r2, #(0x30-0x0e) |
| 1604 | blo m_s68k_read8_comm |
| 1605 | sub r2, r0, #0x58 |
| 1606 | cmp r2, #0x10 |
| 1607 | ldrlo r2, =gfx_cd_read |
| 1608 | ldrhs r2, =s68k_reg_read16 |
| 1609 | stmfd sp!,{r0,lr} |
| 1610 | bic r0, r0, #1 |
| 1611 | mov lr, pc |
| 1612 | bx r2 |
| 1613 | ldmfd sp!,{r1,lr} |
| 1614 | tst r1, #1 |
| 1615 | moveq r0, r0, lsr #8 |
| 1616 | and r0, r0, #0xff |
| 1617 | bx lr |
| 1618 | |
| 1619 | m_s68k_read8_comm: |
| 1620 | ldr r1, =(Pico+0x22200) |
| 1621 | ldr r1, [r1] |
| 1622 | add r1, r1, #0x110000 |
| 1623 | ldrb r1, [r1, r0] |
| 1624 | b s68k_poll_detect |
| 1625 | |
| 1626 | |
| 1627 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 1628 | |
| 1629 | |
| 1630 | .macro m_s68k_read16_ram map_addr |
| 1631 | ldr r1, =(Pico+0x22200) |
| 1632 | bic r0, r0, #1 |
| 1633 | ldr r1, [r1] |
| 1634 | .if \map_addr |
| 1635 | add r0, r0, #\map_addr @ map to our address |
| 1636 | .endif |
| 1637 | ldrh r0, [r1, r0] |
| 1638 | bx lr |
| 1639 | .endm |
| 1640 | |
| 1641 | .macro m_s68k_read16_wordram_2M_decode map_addr |
| 1642 | ldr r2, =(Pico+0x22200) |
| 1643 | eor r0, r0, #2 |
| 1644 | ldr r2, [r2] |
| 1645 | mov r0, r0, lsr #1 @ +4-6 <<16 |
| 1646 | add r2, r2, #\map_addr @ map to our address |
| 1647 | ldrb r0, [r2, r0] |
| 1648 | orr r0, r0, r0, lsl #4 |
| 1649 | bic r0, r0, #0xf0 |
| 1650 | bx lr |
| 1651 | .endm |
| 1652 | |
| 1653 | |
| 1654 | m_s68k_read16_prg: @ 0x000000 - 0x07ffff |
| 1655 | m_s68k_read16_wordram_2M: @ 0x080000 - 0x0bffff |
| 1656 | m_s68k_read16_wordram_1M_b1: @ 0x0c0000 - 0x0dffff, maps to 0x0e0000 |
| 1657 | m_s68k_read16_ram 0x020000 |
| 1658 | |
| 1659 | |
| 1660 | m_s68k_read16_wordram_2M_decode_b0: @ 0x080000 - 0x0bffff |
| 1661 | m_s68k_read16_wordram_2M_decode 0x080000 |
| 1662 | |
| 1663 | |
| 1664 | m_s68k_read16_wordram_2M_decode_b1: @ 0x080000 - 0x0bffff |
| 1665 | m_s68k_read16_wordram_2M_decode 0x0a0000 |
| 1666 | |
| 1667 | |
| 1668 | m_s68k_read16_wordram_1M_b0: @ 0x0c0000 - 0x0dffff (same as our offset :) |
| 1669 | m_s68k_read16_ram 0 |
| 1670 | |
| 1671 | |
| 1672 | @ m_s68k_read16_backup: @ 0xfe0000 - 0xfe3fff (repeated?) |
| 1673 | @ bram is not meant to be accessed by words, does any game do this? |
| 1674 | .equiv m_s68k_read16_backup, m_s68k_read8_backup |
| 1675 | |
| 1676 | |
| 1677 | @ m_s68k_read16_pcm: |
| 1678 | @ pcm is on 8-bit bus, would this be same as byte access? |
| 1679 | .equiv m_s68k_read16_pcm, m_s68k_read8_pcm |
| 1680 | |
| 1681 | |
| 1682 | m_s68k_read16_regs: |
| 1683 | bic r0, r0, #0xff0000 |
| 1684 | bic r0, r0, #0x008000 |
| 1685 | bic r0, r0, #0x000001 |
| 1686 | tst r0, #0x7e00 |
| 1687 | movne r0, #0 |
| 1688 | bxne lr |
| 1689 | sub r2, r0, #0x58 |
| 1690 | cmp r2, #0x10 |
| 1691 | blo gfx_cd_read |
| 1692 | cmp r0, #8 |
| 1693 | bne s68k_reg_read16 |
| 1694 | mov r0, #1 |
| 1695 | b Read_CDC_Host |
| 1696 | |
| 1697 | |
| 1698 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 1699 | |
| 1700 | |
| 1701 | .macro m_s68k_read32_ram map_addr |
| 1702 | ldr r1, =(Pico+0x22200) |
| 1703 | bic r0, r0, #1 |
| 1704 | ldr r1, [r1] |
| 1705 | .if \map_addr |
| 1706 | add r0, r0, #\map_addr @ map to our address |
| 1707 | .endif |
| 1708 | m_read32_gen |
| 1709 | bx lr |
| 1710 | .endm |
| 1711 | |
| 1712 | .macro m_s68k_read32_wordram_2M_decode map_addr |
| 1713 | ldr r2, =(Pico+0x22200) |
| 1714 | eor r0, r0, #2 |
| 1715 | ldr r2, [r2] |
| 1716 | mov r0, r0, lsr #1 @ +4-6 <<16 |
| 1717 | add r2, r2, #\map_addr @ map to our address |
| 1718 | ldrb r1, [r2, r0]! |
| 1719 | tst r0, #1 |
| 1720 | ldrneb r0, [r2, #-1] |
| 1721 | ldreqb r0, [r2, #2] |
| 1722 | orr r1, r1, r1, lsl #4 |
| 1723 | bic r1, r1, #0xf0 |
| 1724 | orr r0, r0, r0, lsl #4 |
| 1725 | bic r0, r0, #0xf0 |
| 1726 | orr r0, r0, r1, lsl #16 |
| 1727 | bx lr |
| 1728 | .endm |
| 1729 | |
| 1730 | |
| 1731 | m_s68k_read32_prg: @ 0x000000 - 0x07ffff |
| 1732 | m_s68k_read32_wordram_2M: @ 0x080000 - 0x0bffff |
| 1733 | m_s68k_read32_wordram_1M_b1: @ 0x0c0000 - 0x0dffff, maps to 0x0e0000 |
| 1734 | m_s68k_read32_ram 0x020000 |
| 1735 | |
| 1736 | |
| 1737 | m_s68k_read32_wordram_2M_decode_b0: @ 0x080000 - 0x0bffff |
| 1738 | m_s68k_read32_wordram_2M_decode 0x080000 |
| 1739 | |
| 1740 | |
| 1741 | m_s68k_read32_wordram_2M_decode_b1: @ 0x080000 - 0x0bffff |
| 1742 | m_s68k_read32_wordram_2M_decode 0x0a0000 |
| 1743 | |
| 1744 | |
| 1745 | m_s68k_read32_wordram_1M_b0: @ 0x0c0000 - 0x0dffff (same as our offset :) |
| 1746 | m_s68k_read32_ram 0 |
| 1747 | |
| 1748 | |
| 1749 | m_s68k_read32_backup: @ 0xfe0000 - 0xfe3fff (repeated?) |
| 1750 | @ bram is not meant to be accessed by words, does any game do this? |
| 1751 | mov r12,lr |
| 1752 | mov r3, r0 |
| 1753 | bl m_s68k_read8_backup @ must preserve r3 and r12 |
| 1754 | mov r1, r0 |
| 1755 | add r0, r3, #2 |
| 1756 | mov r3, r1 |
| 1757 | bl m_s68k_read8_backup |
| 1758 | orr r0, r0, r3, lsl #16 |
| 1759 | bx r12 |
| 1760 | |
| 1761 | |
| 1762 | m_s68k_read32_pcm: |
| 1763 | mov r12,lr |
| 1764 | mov r3, r0 |
| 1765 | bl m_s68k_read8_pcm @ must preserve r3 and r12 |
| 1766 | mov r1, r0 |
| 1767 | add r0, r3, #2 |
| 1768 | mov r3, r1 |
| 1769 | bl m_s68k_read8_pcm |
| 1770 | orr r0, r0, r3, lsl #16 |
| 1771 | bx r12 |
| 1772 | |
| 1773 | |
| 1774 | m_s68k_read32_regs: |
| 1775 | bic r0, r0, #0xff0000 |
| 1776 | bic r0, r0, #0x008000 |
| 1777 | bic r0, r0, #0x000001 |
| 1778 | tst r0, #0x7e00 |
| 1779 | movne r0, #0 |
| 1780 | bxne lr |
| 1781 | sub r2, r0, #0x58 |
| 1782 | cmp r2, #0x10 |
| 1783 | add r1, r0, #2 |
| 1784 | blo m_s68k_read32_regs_gfx |
| 1785 | stmfd sp!,{r1,lr} |
| 1786 | bl s68k_reg_read16 |
| 1787 | swp r0, r0, [sp] |
| 1788 | bl s68k_reg_read16 |
| 1789 | ldmfd sp!,{r1,lr} |
| 1790 | orr r0, r0, r1, lsl #16 |
| 1791 | bx lr |
| 1792 | |
| 1793 | |
| 1794 | m_s68k_read32_regs_gfx: |
| 1795 | stmfd sp!,{r1,lr} |
| 1796 | bl gfx_cd_read |
| 1797 | swp r0, r0, [sp] |
| 1798 | bl gfx_cd_read |
| 1799 | ldmfd sp!,{r1,lr} |
| 1800 | orr r0, r0, r1, lsl #16 |
| 1801 | bx lr |
| 1802 | |
| 1803 | .pool |
| 1804 | |
| 1805 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 1806 | |
| 1807 | |
| 1808 | .macro m_s68k_write8_ram map_addr |
| 1809 | ldr r2, =(Pico+0x22200) |
| 1810 | eor r0, r0, #1 |
| 1811 | ldr r2, [r2] |
| 1812 | .if \map_addr |
| 1813 | add r0, r0, #\map_addr @ map to our address |
| 1814 | .endif |
| 1815 | strb r1, [r2, r0] |
| 1816 | bx lr |
| 1817 | .endm |
| 1818 | |
| 1819 | .macro m_s68k_write8_2M_decode map_addr |
| 1820 | ldr r2, =(Pico+0x22200) |
| 1821 | eor r0, r0, #2 |
| 1822 | ldr r2, [r2] |
| 1823 | movs r0, r0, lsr #1 @ +4-6 <<16 |
| 1824 | add r2, r2, #\map_addr @ map to our address |
| 1825 | .endm |
| 1826 | |
| 1827 | .macro m_s68k_write8_2M_decode_m0 map_addr @ mode off |
| 1828 | m_s68k_write8_2M_decode \map_addr |
| 1829 | ldrb r0, [r2, r0]! |
| 1830 | and r1, r1, #0x0f |
| 1831 | movcc r1, r1, lsl #4 |
| 1832 | andcc r3, r0, #0x0f |
| 1833 | andcs r3, r0, #0xf0 |
| 1834 | orr r3, r3, r1 |
| 1835 | cmp r0, r3 @ avoid writing if result is same |
| 1836 | strneb r3, [r2] |
| 1837 | bx lr |
| 1838 | .endm |
| 1839 | |
| 1840 | .macro m_s68k_write8_2M_decode_m1 map_addr @ mode underwrite |
| 1841 | ands r1, r1, #0x0f |
| 1842 | bxeq lr |
| 1843 | m_s68k_write8_2M_decode \map_addr |
| 1844 | ldrb r0, [r2, r0]! |
| 1845 | movcc r1, r1, lsl #4 |
| 1846 | andcc r3, r0, #0x0f |
| 1847 | andcs r3, r0, #0xf0 |
| 1848 | tst r3, r3 |
| 1849 | bxeq lr |
| 1850 | orr r3, r3, r1 |
| 1851 | cmp r0, r3 |
| 1852 | strneb r3, [r2] |
| 1853 | bx lr |
| 1854 | .endm |
| 1855 | |
| 1856 | .macro m_s68k_write8_2M_decode_m2 map_addr @ mode overwrite |
| 1857 | ands r1, r1, #0x0f |
| 1858 | bxeq lr |
| 1859 | m_s68k_write8_2M_decode_m0 \map_addr @ same as in off mode |
| 1860 | .endm |
| 1861 | |
| 1862 | |
| 1863 | |
| 1864 | m_s68k_write8_prg: @ 0x000000 - 0x07ffff |
| 1865 | ldr r2, =(Pico+0x22200) |
| 1866 | eor r0, r0, #1 |
| 1867 | ldr r2, [r2] |
| 1868 | add r3, r0, #0x020000 @ map to our address |
| 1869 | add r12,r2, #0x110000 |
| 1870 | ldr r12,[r12] |
| 1871 | and r12,r12,#0x00ff0000 @ wp |
| 1872 | cmp r0, r12, lsr #8 |
| 1873 | strgeb r1, [r2, r3] |
| 1874 | bx lr |
| 1875 | |
| 1876 | |
| 1877 | m_s68k_write8_wordram_2M: @ 0x080000 - 0x0bffff |
| 1878 | m_s68k_write8_wordram_1M_b1: @ 0x0c0000 - 0x0dffff, maps to 0x0e0000 |
| 1879 | m_s68k_write8_ram 0x020000 |
| 1880 | |
| 1881 | |
| 1882 | m_s68k_write8_2M_decode_b0_m0: @ 0x080000 - 0x0bffff |
| 1883 | m_s68k_write8_2M_decode_m0 0x080000 |
| 1884 | |
| 1885 | m_s68k_write8_2M_decode_b0_m1: |
| 1886 | m_s68k_write8_2M_decode_m1 0x080000 |
| 1887 | |
| 1888 | m_s68k_write8_2M_decode_b0_m2: |
| 1889 | m_s68k_write8_2M_decode_m2 0x080000 |
| 1890 | |
| 1891 | m_s68k_write8_2M_decode_b1_m0: |
| 1892 | m_s68k_write8_2M_decode_m0 0x0a0000 |
| 1893 | |
| 1894 | m_s68k_write8_2M_decode_b1_m1: |
| 1895 | m_s68k_write8_2M_decode_m1 0x0a0000 |
| 1896 | |
| 1897 | m_s68k_write8_2M_decode_b1_m2: |
| 1898 | m_s68k_write8_2M_decode_m2 0x0a0000 |
| 1899 | |
| 1900 | |
| 1901 | m_s68k_write8_wordram_1M_b0: @ 0x0c0000 - 0x0dffff (same as our offset :) |
| 1902 | m_s68k_write8_ram 0 |
| 1903 | |
| 1904 | |
| 1905 | m_s68k_write8_backup: @ 0xfe0000 - 0xfe3fff (repeated?) |
| 1906 | @ must not trash r3 and r12 |
| 1907 | ldr r2, =(Pico+0x22200) |
| 1908 | mov r0, r0, lsr #1 |
| 1909 | ldr r2, [r2] |
| 1910 | bic r0, r0, #0xff0000 |
| 1911 | bic r0, r0, #0x00e000 |
| 1912 | add r2, r2, #0x110000 |
| 1913 | add r2, r2, #0x000200 |
| 1914 | strb r1, [r2, r0] |
| 1915 | ldr r1, =SRam |
| 1916 | mov r0, #1 |
| 1917 | strb r0, [r1, #0x0e] @ SRam.changed = 1 |
| 1918 | bx lr |
| 1919 | |
| 1920 | |
| 1921 | m_s68k_write8_pcm: |
| 1922 | bic r0, r0, #0xff0000 |
| 1923 | cmp r0, #0x12 |
| 1924 | movlt r0, r0, lsr #1 |
| 1925 | blt pcm_write |
| 1926 | |
| 1927 | cmp r0, #0x2000 |
| 1928 | bxlt lr |
| 1929 | |
| 1930 | m_s68k_write8_pcm_ram: |
| 1931 | ldr r3, =(Pico+0x22200) |
| 1932 | bic r0, r0, #0x00e000 |
| 1933 | ldr r3, [r3] |
| 1934 | mov r0, r0, lsr #1 |
| 1935 | add r2, r3, #0x110000 |
| 1936 | add r2, r2, #0x002200 |
| 1937 | add r2, r2, #0x000040 |
| 1938 | ldr r2, [r2] |
| 1939 | add r3, r3, #0x100000 @ pcm_ram |
| 1940 | and r2, r2, #0x0f000000 @ bank |
| 1941 | add r3, r3, r2, lsr #12 |
| 1942 | strb r1, [r3, r0] |
| 1943 | bx lr |
| 1944 | |
| 1945 | |
| 1946 | m_s68k_write8_regs: |
| 1947 | bic r0, r0, #0xff0000 |
| 1948 | bic r0, r0, #0x008000 |
| 1949 | tst r0, #0x7e00 |
| 1950 | movne r0, #0 |
| 1951 | bxne lr |
| 1952 | sub r2, r0, #0x58 |
| 1953 | cmp r2, #0x10 |
| 1954 | bhs s68k_reg_write8 |
| 1955 | bic r0, r0, #1 |
| 1956 | orr r1, r1, r1, lsl #8 |
| 1957 | b gfx_cd_write16 |
| 1958 | |
| 1959 | |
| 1960 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 1961 | |
| 1962 | |
| 1963 | .macro m_s68k_write16_ram map_addr |
| 1964 | ldr r2, =(Pico+0x22200) |
| 1965 | bic r0, r0, #1 |
| 1966 | ldr r2, [r2] |
| 1967 | .if \map_addr |
| 1968 | add r0, r0, #\map_addr @ map to our address |
| 1969 | .endif |
| 1970 | strh r1, [r2, r0] |
| 1971 | bx lr |
| 1972 | .endm |
| 1973 | |
| 1974 | .macro m_s68k_write16_2M_decode map_addr |
| 1975 | ldr r2, =(Pico+0x22200) |
| 1976 | eor r0, r0, #2 |
| 1977 | ldr r2, [r2] |
| 1978 | mov r0, r0, lsr #1 @ +4-6 <<16 |
| 1979 | add r2, r2, #\map_addr @ map to our address |
| 1980 | .endm |
| 1981 | |
| 1982 | .macro m_s68k_write16_2M_decode_m0 map_addr @ mode off |
| 1983 | m_s68k_write16_2M_decode \map_addr |
| 1984 | bic r1, r1, #0xf0 |
| 1985 | orr r1, r1, r1, lsr #4 |
| 1986 | strb r1, [r2, r0] |
| 1987 | bx lr |
| 1988 | .endm |
| 1989 | |
| 1990 | .macro m_s68k_write16_2M_decode_m1 map_addr @ mode underwrite |
| 1991 | bics r1, r1, #0xf000 |
| 1992 | bicnes r1, r1, #0x00f0 |
| 1993 | bxeq lr |
| 1994 | orr r1, r1, r1, lsr #4 |
| 1995 | m_s68k_write16_2M_decode \map_addr |
| 1996 | ldrb r0, [r2, r0]! |
| 1997 | and r3, r1, #0x0f |
| 1998 | and r1, r1, #0xf0 |
| 1999 | tst r0, #0x0f |
| 2000 | orreq r0, r0, r3 |
| 2001 | tst r0, #0xf0 |
| 2002 | orreq r0, r0, r1 |
| 2003 | strb r0, [r2] |
| 2004 | bx lr |
| 2005 | .endm |
| 2006 | |
| 2007 | .macro m_s68k_write16_2M_decode_m2 map_addr @ mode overwrite |
| 2008 | bics r1, r1, #0xf000 |
| 2009 | bicnes r1, r1, #0x00f0 |
| 2010 | bxeq lr |
| 2011 | orr r1, r1, r1, lsr #4 |
| 2012 | m_s68k_write16_2M_decode \map_addr |
| 2013 | ldrb r0, [r2, r0]! |
| 2014 | ands r3, r1, #0x0f |
| 2015 | andne r0, r0, #0xf0 |
| 2016 | orrne r0, r0, r3 |
| 2017 | ands r1, r1, #0xf0 |
| 2018 | andne r0, r0, #0x0f |
| 2019 | orrne r0, r0, r1 |
| 2020 | strb r0, [r2] |
| 2021 | bx lr |
| 2022 | .endm |
| 2023 | |
| 2024 | |
| 2025 | |
| 2026 | m_s68k_write16_prg: @ 0x000000 - 0x07ffff |
| 2027 | ldr r2, =(Pico+0x22200) |
| 2028 | bic r0, r0, #1 |
| 2029 | ldr r2, [r2] |
| 2030 | add r3, r0, #0x020000 @ map to our address |
| 2031 | add r12,r2, #0x110000 |
| 2032 | ldr r12,[r12] |
| 2033 | and r12,r12,#0x00ff0000 @ wp |
| 2034 | cmp r0, r12, lsr #8 |
| 2035 | strgeh r1, [r2, r3] |
| 2036 | bx lr |
| 2037 | |
| 2038 | |
| 2039 | m_s68k_write16_wordram_2M: @ 0x080000 - 0x0bffff |
| 2040 | m_s68k_write16_wordram_1M_b1: @ 0x0c0000 - 0x0dffff, maps to 0x0e0000 |
| 2041 | m_s68k_write16_ram 0x020000 |
| 2042 | |
| 2043 | |
| 2044 | m_s68k_write16_2M_decode_b0_m0: @ 0x080000 - 0x0bffff |
| 2045 | m_s68k_write16_2M_decode_m0 0x080000 |
| 2046 | |
| 2047 | m_s68k_write16_2M_decode_b0_m1: |
| 2048 | m_s68k_write16_2M_decode_m1 0x080000 |
| 2049 | |
| 2050 | m_s68k_write16_2M_decode_b0_m2: |
| 2051 | m_s68k_write16_2M_decode_m2 0x080000 |
| 2052 | |
| 2053 | m_s68k_write16_2M_decode_b1_m0: |
| 2054 | m_s68k_write16_2M_decode_m0 0x0a0000 |
| 2055 | |
| 2056 | m_s68k_write16_2M_decode_b1_m1: |
| 2057 | m_s68k_write16_2M_decode_m1 0x0a0000 |
| 2058 | |
| 2059 | m_s68k_write16_2M_decode_b1_m2: |
| 2060 | m_s68k_write16_2M_decode_m2 0x0a0000 |
| 2061 | |
| 2062 | |
| 2063 | m_s68k_write16_wordram_1M_b0: @ 0x0c0000 - 0x0dffff (same as our offset :) |
| 2064 | m_s68k_write16_ram 0 |
| 2065 | |
| 2066 | |
| 2067 | @ m_s68k_write16_backup: |
| 2068 | .equiv m_s68k_write16_backup, m_s68k_write8_backup |
| 2069 | |
| 2070 | |
| 2071 | @ m_s68k_write16_pcm: |
| 2072 | .equiv m_s68k_write16_pcm, m_s68k_write8_pcm |
| 2073 | |
| 2074 | |
| 2075 | m_s68k_write16_regs: |
| 2076 | bic r0, r0, #0xff0000 |
| 2077 | bic r0, r0, #0x008000 |
| 2078 | bic r0, r0, #1 |
| 2079 | tst r0, #0x7e00 |
| 2080 | movne r0, #0 |
| 2081 | bxne lr |
| 2082 | cmp r0, #0x0e |
| 2083 | beq m_s68k_write16_regs_spec |
| 2084 | sub r2, r0, #0x58 |
| 2085 | cmp r2, #0x10 |
| 2086 | blo gfx_cd_write16 |
| 2087 | and r3, r1, #0xff |
| 2088 | add r2, r0, #1 |
| 2089 | stmfd sp!,{r2,r3,lr} |
| 2090 | mov r1, r1, lsr #8 |
| 2091 | bl s68k_reg_write8 |
| 2092 | ldmfd sp!,{r0,r1,lr} |
| 2093 | b s68k_reg_write8 |
| 2094 | |
| 2095 | m_s68k_write16_regs_spec: @ special case |
| 2096 | ldr r2, =(Pico+0x22200) |
| 2097 | mov r0, #0x110000 |
| 2098 | ldr r2, [r2] |
| 2099 | add r0, r0, #0x00000f |
| 2100 | strb r1, [r2, r0] @ if (a == 0xe) s68k_regs[0xf] = d; |
| 2101 | bx lr |
| 2102 | |
| 2103 | |
| 2104 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
| 2105 | |
| 2106 | |
| 2107 | .macro m_s68k_write32_ram map_addr |
| 2108 | ldr r2, =(Pico+0x22200) |
| 2109 | bic r0, r0, #1 |
| 2110 | ldr r2, [r2] |
| 2111 | .if \map_addr |
| 2112 | add r0, r0, #\map_addr @ map to our address |
| 2113 | .endif |
| 2114 | m_write32_gen |
| 2115 | bx lr |
| 2116 | .endm |
| 2117 | |
| 2118 | .macro m_s68k_write32_2M_decode map_addr |
| 2119 | ldr r2, =(Pico+0x22200) |
| 2120 | eor r0, r0, #2 |
| 2121 | ldr r2, [r2] |
| 2122 | mov r0, r0, lsr #1 @ +4-6 <<16 |
| 2123 | add r2, r2, #\map_addr @ map to our address |
| 2124 | .endm |
| 2125 | |
| 2126 | .macro m_s68k_write32_2M_decode_m0 map_addr @ mode off |
| 2127 | m_s68k_write32_2M_decode \map_addr |
| 2128 | bic r1, r1, #0x000000f0 |
| 2129 | bic r1, r1, #0x00f00000 |
| 2130 | orr r1, r1, r1, lsr #4 |
| 2131 | mov r3, r1, lsr #16 |
| 2132 | strb r3, [r2, r0]! |
| 2133 | tst r0, #1 |
| 2134 | strneb r1, [r2, #-1] |
| 2135 | streqb r1, [r2, #3] |
| 2136 | bx lr |
| 2137 | .endm |
| 2138 | |
| 2139 | .macro m_s68k_write32_2M_decode_m1 map_addr @ mode underwrite |
| 2140 | bics r1, r1, #0x000000f0 |
| 2141 | bicnes r1, r1, #0x0000f000 |
| 2142 | bicnes r1, r1, #0x00f00000 |
| 2143 | bicnes r1, r1, #0xf0000000 |
| 2144 | bxeq lr |
| 2145 | orr r1, r1, r1, lsr #4 |
| 2146 | m_s68k_write32_2M_decode \map_addr |
| 2147 | ldrb r3, [r2, r0]! |
| 2148 | tst r0, #1 |
| 2149 | ldrneb r0, [r2, #-1] |
| 2150 | ldreqb r0, [r2, #3] |
| 2151 | and r12,r1, #0x0000000f |
| 2152 | orr r0, r0, r3, lsl #16 |
| 2153 | orrne r0, r0, #0x80000000 @ remember addr lsb bit |
| 2154 | tst r0, #0x0000000f |
| 2155 | orreq r0, r0, r12 |
| 2156 | tst r0, #0x000000f0 |
| 2157 | andeq r12,r1, #0x000000f0 |
| 2158 | orreq r0, r0, r12 |
| 2159 | tst r0, #0x000f0000 |
| 2160 | andeq r12,r1, #0x000f0000 |
| 2161 | orreq r0, r0, r12 |
| 2162 | tst r0, #0x00f00000 |
| 2163 | andeq r12,r1, #0x00f00000 |
| 2164 | orreq r0, r0, r12 |
| 2165 | tst r0, #0x80000000 |
| 2166 | strneb r0, [r2, #-1] |
| 2167 | streqb r0, [r2, #3] |
| 2168 | mov r0, r0, lsr #16 |
| 2169 | strb r0, [r2] |
| 2170 | bx lr |
| 2171 | .endm |
| 2172 | |
| 2173 | .macro m_s68k_write32_2M_decode_m2 map_addr @ mode overwrite |
| 2174 | bics r1, r1, #0x000000f0 |
| 2175 | bicnes r1, r1, #0x0000f000 |
| 2176 | bicnes r1, r1, #0x00f00000 |
| 2177 | bicnes r1, r1, #0xf0000000 |
| 2178 | bxeq lr |
| 2179 | orr r1, r1, r1, lsr #4 |
| 2180 | m_s68k_write32_2M_decode \map_addr |
| 2181 | ldrb r3, [r2, r0]! |
| 2182 | tst r0, #1 |
| 2183 | ldrneb r0, [r2, #-1] |
| 2184 | ldreqb r0, [r2, #3] |
| 2185 | orrne r1, r1, #0x80000000 @ remember addr lsb bit |
| 2186 | orr r0, r0, r3, lsl #16 |
| 2187 | tst r1, #0x0000000f |
| 2188 | andeq r12,r0, #0x0000000f |
| 2189 | orreq r1, r1, r12 |
| 2190 | tst r1, #0x000000f0 |
| 2191 | andeq r12,r0, #0x000000f0 |
| 2192 | orreq r1, r1, r12 |
| 2193 | tst r1, #0x000f0000 |
| 2194 | andeq r12,r0, #0x000f0000 |
| 2195 | orreq r1, r1, r12 |
| 2196 | tst r1, #0x00f00000 |
| 2197 | andeq r12,r0, #0x00f00000 |
| 2198 | orreq r1, r1, r12 |
| 2199 | cmp r0, r1 |
| 2200 | bxeq lr |
| 2201 | tst r1, #0x80000000 |
| 2202 | strneb r1, [r2, #-1] |
| 2203 | streqb r1, [r2, #3] |
| 2204 | mov r1, r1, lsr #16 |
| 2205 | strb r1, [r2] |
| 2206 | bx lr |
| 2207 | .endm |
| 2208 | |
| 2209 | |
| 2210 | |
| 2211 | m_s68k_write32_prg: @ 0x000000 - 0x07ffff |
| 2212 | ldr r2, =(Pico+0x22200) |
| 2213 | bic r0, r0, #1 |
| 2214 | ldr r2, [r2] |
| 2215 | add r3, r0, #0x020000 @ map to our address |
| 2216 | add r12,r2, #0x110000 |
| 2217 | ldr r12,[r12] |
| 2218 | and r12,r12,#0x00ff0000 @ wp |
| 2219 | cmp r0, r12, lsr #8 |
| 2220 | bxlt lr |
| 2221 | mov r0, r1, lsr #16 |
| 2222 | strh r0, [r2, r3]! |
| 2223 | strh r1, [r2, #2] |
| 2224 | bx lr |
| 2225 | |
| 2226 | |
| 2227 | m_s68k_write32_wordram_2M: @ 0x080000 - 0x0bffff |
| 2228 | m_s68k_write32_wordram_1M_b1: @ 0x0c0000 - 0x0dffff, maps to 0x0e0000 |
| 2229 | m_s68k_write32_ram 0x020000 |
| 2230 | |
| 2231 | |
| 2232 | m_s68k_write32_2M_decode_b0_m0: @ 0x080000 - 0x0bffff |
| 2233 | m_s68k_write32_2M_decode_m0 0x080000 |
| 2234 | |
| 2235 | m_s68k_write32_2M_decode_b0_m1: |
| 2236 | m_s68k_write32_2M_decode_m1 0x080000 |
| 2237 | |
| 2238 | m_s68k_write32_2M_decode_b0_m2: |
| 2239 | m_s68k_write32_2M_decode_m2 0x080000 |
| 2240 | |
| 2241 | m_s68k_write32_2M_decode_b1_m0: |
| 2242 | m_s68k_write32_2M_decode_m0 0x0a0000 |
| 2243 | |
| 2244 | m_s68k_write32_2M_decode_b1_m1: |
| 2245 | m_s68k_write32_2M_decode_m1 0x0a0000 |
| 2246 | |
| 2247 | m_s68k_write32_2M_decode_b1_m2: |
| 2248 | m_s68k_write32_2M_decode_m2 0x0a0000 |
| 2249 | |
| 2250 | |
| 2251 | m_s68k_write32_wordram_1M_b0: @ 0x0c0000 - 0x0dffff (same as our offset :) |
| 2252 | m_s68k_write32_ram 0 |
| 2253 | |
| 2254 | |
| 2255 | m_s68k_write32_backup: |
| 2256 | add r12,r0, #2 |
| 2257 | mov r3, r1 |
| 2258 | mov r1, r1, lsr #16 |
| 2259 | stmfd sp!,{lr} |
| 2260 | bl m_s68k_write8_backup @ must preserve r3 and r12 |
| 2261 | ldmfd sp!,{lr} |
| 2262 | mov r0, r12 |
| 2263 | mov r1, r3 |
| 2264 | b m_s68k_write8_backup |
| 2265 | |
| 2266 | |
| 2267 | m_s68k_write32_pcm: |
| 2268 | bic r0, r0, #0xff0000 |
| 2269 | cmp r0, #0x12 |
| 2270 | blt m_s68k_write32_pcm_reg |
| 2271 | |
| 2272 | cmp r0, #0x2000 |
| 2273 | bxlt lr |
| 2274 | |
| 2275 | m_s68k_write32_pcm_ram: |
| 2276 | ldr r3, =(Pico+0x22200) |
| 2277 | bic r0, r0, #0x00e000 |
| 2278 | ldr r3, [r3] |
| 2279 | mov r0, r0, lsr #1 |
| 2280 | add r2, r3, #0x110000 |
| 2281 | add r2, r2, #0x002200 |
| 2282 | add r2, r2, #0x000040 |
| 2283 | ldr r2, [r2] |
| 2284 | add r3, r3, #0x100000 @ pcm_ram |
| 2285 | and r2, r2, #0x0f000000 @ bank |
| 2286 | add r3, r3, r2, lsr #12 |
| 2287 | mov r1, r1, ror #16 |
| 2288 | strb r1, [r3, r0]! |
| 2289 | mov r1, r1, ror #16 |
| 2290 | strb r1, [r3] |
| 2291 | bx lr |
| 2292 | |
| 2293 | m_s68k_write32_pcm_reg: |
| 2294 | mov r0, r0, lsr #1 |
| 2295 | stmfd sp!,{r0,r1,lr} |
| 2296 | mov r1, r1, lsr #16 |
| 2297 | bl pcm_write |
| 2298 | ldmfd sp!,{r0,r1,lr} |
| 2299 | add r0, r0, #1 |
| 2300 | b pcm_write |
| 2301 | |
| 2302 | |
| 2303 | m_s68k_write32_regs: |
| 2304 | bic r0, r0, #0xff0000 |
| 2305 | bic r0, r0, #0x008000 |
| 2306 | bic r0, r0, #1 |
| 2307 | tst r0, #0x7e00 |
| 2308 | bxne lr |
| 2309 | sub r2, r0, #0x58 |
| 2310 | cmp r2, #0x10 |
| 2311 | blo m_s68k_write32_regs_gfx |
| 2312 | and r2, r0, #0x1fc |
| 2313 | cmp r2, #0x0c |
| 2314 | beq m_s68k_write32_regs_spec @ hits 0x0f |
| 2315 | and r2, r0, #0x1f0 |
| 2316 | cmp r2, #0x20 |
| 2317 | beq m_s68k_write32_regs_comm |
| 2318 | |
| 2319 | stmfd sp!,{r0,r1,lr} |
| 2320 | mov r1, r1, lsr #24 |
| 2321 | bl s68k_reg_write8 |
| 2322 | ldr r0, [sp] |
| 2323 | ldr r1, [sp, #4] |
| 2324 | add r0, r0, #1 |
| 2325 | mov r1, r1, lsr #16 |
| 2326 | bl s68k_reg_write8 |
| 2327 | ldr r0, [sp] |
| 2328 | ldr r1, [sp, #4] |
| 2329 | add r0, r0, #2 |
| 2330 | mov r1, r1, lsr #8 |
| 2331 | bl s68k_reg_write8 |
| 2332 | ldmfd sp!,{r0,r1,lr} |
| 2333 | add r0, r0, #3 |
| 2334 | b s68k_reg_write8 |
| 2335 | |
| 2336 | m_s68k_write32_regs_gfx: |
| 2337 | stmfd sp!,{r0,r1,lr} |
| 2338 | mov r1, r1, lsr #16 |
| 2339 | bl gfx_cd_write16 |
| 2340 | ldmfd sp!,{r0,r1,lr} |
| 2341 | add r0, r0, #2 |
| 2342 | b gfx_cd_write16 |
| 2343 | |
| 2344 | m_s68k_write32_regs_comm: @ Handle the 0x20-0x2f range |
| 2345 | ldr r2, =(Pico+0x22200) |
| 2346 | mov r3, #0xff |
| 2347 | ldr r2, [r2] |
| 2348 | orr r3, r3, r3, lsl #16 |
| 2349 | add r2, r2, #0x110000 |
| 2350 | and r12,r3, r1, ror #16 @ data is big-endian to be written as little, have to byteswap |
| 2351 | and r1, r3, r1, ror #24 |
| 2352 | orr r1, r1, r12,lsl #8 @ end of byteswap |
| 2353 | cmp r0, #0x2e |
| 2354 | strh r1, [r0, r2]! |
| 2355 | movne r1, r1, lsr #16 |
| 2356 | strneh r1, [r0, #2] |
| 2357 | bx lr |
| 2358 | |
| 2359 | m_s68k_write32_regs_spec: |
| 2360 | stmfd sp!,{r0,r1,lr} |
| 2361 | mov r1, r1, lsr #16 |
| 2362 | bl m_s68k_write16_regs |
| 2363 | ldmfd sp!,{r0,r1,lr} |
| 2364 | add r0, r0, #2 |
| 2365 | b m_s68k_write16_regs |
| 2366 | |
| 2367 | |