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1 | # Assemble with gas |
| 2 | # --register-prefix-optional --bitwise-or |
| 3 | |
| 4 | .macro ldarg arg, stacksz, reg |
| 5 | move.l (4 + \arg * 4 + \stacksz)(%sp), \reg |
| 6 | .endm |
| 7 | |
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8 | .macro ldargw arg, stacksz, reg |
| 9 | move.w (4 + \arg * 4 + 2 + \stacksz)(%sp), \reg |
| 10 | .endm |
| 11 | |
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12 | .global burn10 /* u16 val */ |
| 13 | burn10: |
| 14 | ldarg 0, 0, d0 |
| 15 | subq.l #1, d0 |
| 16 | 0: |
| 17 | dbra d0, 0b |
| 18 | rts |
| 19 | |
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20 | .global write16_x16 /* u32 a, u16 count, u16 d */ |
| 21 | write16_x16: |
| 22 | ldarg 0, 0, a0 |
| 23 | ldarg 2, 0, d0 |
| 24 | move.w d0, d1 |
| 25 | swap d0 |
| 26 | move.w d1, d0 |
| 27 | ldarg 1, 0, d1 |
| 28 | subq.l #1, d1 |
| 29 | 0: |
| 30 | move.l d0, (a0) |
| 31 | move.l d0, (a0) |
| 32 | move.l d0, (a0) |
| 33 | move.l d0, (a0) |
| 34 | move.l d0, (a0) |
| 35 | move.l d0, (a0) |
| 36 | move.l d0, (a0) |
| 37 | move.l d0, (a0) |
| 38 | dbra d1, 0b |
| 39 | rts |
| 40 | |
| 41 | # read single phase from controller |
| 42 | # d0 - result |
| 43 | # destroys d1,d2 |
| 44 | .global get_input |
| 45 | get_input: |
| 46 | move.b #0x40,(0xa10003) |
| 47 | moveq.l #0,d0 |
| 48 | nop |
| 49 | nop |
| 50 | move.b (0xa10003),d1 |
| 51 | move.b #0x00,(0xa10003) |
| 52 | andi.w #0x3f,d1 /* 00CB RLDU */ |
| 53 | nop |
| 54 | move.b (0xa10003),d0 |
| 55 | lsl.b #2,d0 |
| 56 | andi.w #0xc0,d0 /* SA00 0000 */ |
| 57 | or.b d1,d0 |
| 58 | eor.b #0xff,d0 |
| 59 | .if 0 |
| 60 | swap d7 |
| 61 | move.w d7,d1 |
| 62 | eor.w d0,d1 /* changed btns */ |
| 63 | move.w d0,d7 /* old val */ |
| 64 | swap d7 |
| 65 | and.w d0,d1 /* what changed now */ |
| 66 | .endif |
| 67 | rts |
| 68 | |
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69 | .global write_and_read1 /* u32 a, u16 d, void *dst */ |
| 70 | write_and_read1: |
| 71 | ldarg 0, 0, a0 |
| 72 | ldargw 1, 0, d0 |
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73 | #ifndef PICO |
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74 | move.w d0, (a0) |
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75 | #else |
| 76 | movea.l a0, a1 |
| 77 | subq.l #1, a1 |
| 78 | move.w d0, 1(a1) |
| 79 | #endif |
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80 | move.l (a0), d0 |
| 81 | move.l (a0), d1 |
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82 | |
| 83 | ldarg 2, 0, a1 |
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84 | move.l d0, (a1)+ |
| 85 | move.l d1, (a1)+ |
| 86 | rts |
| 87 | |
| 88 | .global move_sr /* u16 sr */ |
| 89 | move_sr: |
| 90 | ldargw 0, 0, d0 |
| 91 | move.w d0, sr |
| 92 | rts |
| 93 | |
| 94 | .global move_sr_and_read /* u16 sr, u32 a */ |
| 95 | move_sr_and_read: |
| 96 | ldargw 0, 0, d0 |
| 97 | ldarg 1, 0, a0 |
| 98 | move.w d0, sr |
| 99 | move.w (a0), d0 |
| 100 | rts |
| 101 | |
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102 | .global read_sr |
| 103 | read_sr: |
| 104 | move.w sr, d0 |
| 105 | rts |
| 106 | |
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107 | .global memcpy_ /* void *dst, const void *src, u16 size */ |
| 108 | memcpy_: |
| 109 | ldarg 0, 0, a0 |
| 110 | ldarg 1, 0, a1 |
| 111 | ldargw 2, 0, d0 |
| 112 | subq.w #1, d0 |
| 113 | 0: |
| 114 | move.b (a1)+, (a0)+ /* not in a hurry */ |
| 115 | dbra d0, 0b |
| 116 | rts |
| 117 | |
| 118 | .global memset_ /* void *dst, int d, u16 size */ |
| 119 | memset_: |
| 120 | ldarg 0, 0, a0 |
| 121 | ldargw 1, 0, d1 |
| 122 | ldargw 2, 0, d0 |
| 123 | subq.w #1, d0 |
| 124 | 0: |
| 125 | move.b d1, (a0)+ /* not in a hurry */ |
| 126 | dbra d0, 0b |
| 127 | rts |
| 128 | |
| 129 | # tests |
| 130 | |
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131 | .global test_vcnt_vb |
| 132 | test_vcnt_vb: |
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133 | movem.l d2-d7/a2, -(sp) |
| 134 | movea.l #0xc00007, a0 |
| 135 | movea.l #0xc00008, a1 |
| 136 | movea.l #0xff0000, a2 |
| 137 | moveq.l #0, d4 /* d4 = count */ |
| 138 | moveq.l #0, d5 /* d5 = vcnt_expect */ |
| 139 | /* d6 = old */ |
| 140 | move.l #1<<(3+16), d7 /* d7 = SR_VB */ |
| 141 | 0: |
| 142 | btst #3, (a0) |
| 143 | beq 0b /* not blanking */ |
| 144 | 0: |
| 145 | btst #3, (a0) |
| 146 | bne 0b /* blanking */ |
| 147 | |
| 148 | addq.l #1, a0 |
| 149 | 0: |
| 150 | tst.b (a0) |
| 151 | bne 0b /* not line 0 */ |
| 152 | |
| 153 | subq.l #2, a0 |
| 154 | move.l (a0), d6 |
| 155 | move.l d6, (a2)+ /* d0 = old */ |
| 156 | ### |
| 157 | 0: |
| 158 | move.b (a1), d2 /* 8 d2 = vcnt */ |
| 159 | cmp.b (a1), d2 /* 8 reread for corruption */ |
| 160 | bne 0b /* 10 on changing vcounter? */ |
| 161 | cmp.b d2, d5 /* 4 vcnt == vcnt_expect? */ |
| 162 | beq 0b /* 10 */ |
| 163 | move.l (a0), d0 /* 12 */ |
| 164 | tst.b d2 /* 4 */ |
| 165 | beq 3f |
| 166 | 1: |
| 167 | addq.l #1, d4 /* count++ */ |
| 168 | addq.l #1, d5 |
| 169 | cmp.b d2, d5 |
| 170 | bne 2f /* vcnt == vcnt_expect + 1 */ |
| 171 | move.l d0, d1 |
| 172 | eor.l d6, d1 |
| 173 | and.l d7, d1 /* (old ^ val) & vb */ |
| 174 | bne 2f |
| 175 | move.l d0, d6 /* old = val */ |
| 176 | bra 0b |
| 177 | |
| 178 | 2: /* vcnt jump or vb change */ |
| 179 | move.l d6, (a2)+ /* *ram++ = old */ |
| 180 | move.l d0, (a2)+ /* *ram++ = val */ |
| 181 | move.b d2, d5 /* vcnt_expect = vcnt */ |
| 182 | move.l d0, d6 /* old = val */ |
| 183 | bra 0b |
| 184 | |
| 185 | 3: /* vcnt == 0 */ |
| 186 | move.l d0, d1 |
| 187 | and.l d7, d1 |
| 188 | bne 1b /* still in VB */ |
| 189 | |
| 190 | move.l d0, (a2)+ /* *ram++ = val */ |
| 191 | move.l d4, (a2)+ /* *ram++ = count */ |
| 192 | |
| 193 | movem.l (sp)+, d2-d7/a2 |
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194 | rts |
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195 | |
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196 | .global test_hint |
| 197 | test_hint: |
| 198 | move.w d0, -(sp) /* 8 */ |
| 199 | move.w (0xc00008).l, d0 /* 16 */ |
| 200 | addq.w #1, (0xf000).w /* 16 */ |
| 201 | tst.w (0xf002).w /* 12 */ |
| 202 | bne 0f /* 10 */ |
| 203 | move.w d0, (0xf002).w /* 12 */ |
| 204 | 0: |
| 205 | move.w d0, (0xf004).w /* 12 */ |
| 206 | move.w (sp)+, d0 /* 8 */ |
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207 | rte /* 20 114+44 */ |
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208 | .global test_hint_end |
| 209 | test_hint_end: |
| 210 | |
| 211 | .global test_vint |
| 212 | test_vint: |
| 213 | move.w d0, -(sp) /* 8 */ |
| 214 | move.w (0xc00008).l, d0 /* 16 */ |
| 215 | addq.w #1, (0xf008).w /* 16 */ |
| 216 | tst.w (0xf00a).w /* 12 */ |
| 217 | bne 0f /* 10 */ |
| 218 | move.w d0, (0xf00a).w /* 12 */ |
| 219 | 0: |
| 220 | move.w d0, (0xf00c).w /* 12 */ |
| 221 | move.w (sp)+, d0 /* 8 */ |
| 222 | rte /* 20 114 */ |
| 223 | .global test_vint_end |
| 224 | test_vint_end: |
| 225 | |
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226 | .global x32x_enable |
| 227 | x32x_enable: |
| 228 | movea.l #0xa15100, a0 |
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229 | movea.l #0xa15122, a1 |
| 230 | move.w #1, (a0) /* ADEN */ |
| 231 | # wait for min(20_sh2_cycles, pll_setup_time) |
| 232 | # pll time is unclear, icd_mars.prg mentions 10ms which sounds |
| 233 | # way too much. Hope 40 68k cycles is enough |
| 234 | move.w #40/10, d0 |
| 235 | 0: |
| 236 | dbra d0, 0b |
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237 | move.w #3, (a0) /* ADEN, nRES */ |
| 238 | 0: |
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239 | move.w #0xffff, d0 /* waste some cycles */ |
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240 | tst.w (a1) |
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241 | beq 0b /* master BIOS busy */ |
| 242 | |
| 243 | 0: /* for slave, use a limit, as it */ |
| 244 | tst.w 4(a1) /* won't respond on master error. */ |
| 245 | dbne d0, 0b /* slave BIOS busy */ |
| 246 | |
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247 | or.w #1, 6(a0) /* RV */ |
| 248 | rts |
| 249 | .global x32x_enable_end |
| 250 | x32x_enable_end: |
| 251 | |
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252 | .global test_32x_b_c0 |
| 253 | test_32x_b_c0: |
| 254 | ldarg 0, 0, a1 |
| 255 | ldargw 1, 0, d0 |
| 256 | jsr (0xc0).l /* move.b d0, (a1); RV=0 */ |
| 257 | bset #0, (0xa15107).l |
| 258 | rts |
| 259 | .global test_32x_b_c0_end |
| 260 | test_32x_b_c0_end: |
| 261 | |
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262 | # some nastyness from Fatal Rewind |
| 263 | .global test_h_v_2 |
| 264 | test_h_v_2: |
| 265 | move.w #0x2000, sr |
| 266 | move.w #0x8014, (0xFFC00004).l |
| 267 | move.w #0x8164, (0xFFC00004).l |
| 268 | move.w #1, d0 |
| 269 | 0: |
| 270 | dbra d0, 0b |
| 271 | move.w #0x2700, sr |
| 272 | rts |
| 273 | |
| 274 | .global test_v_h_2 |
| 275 | test_v_h_2: |
| 276 | move.w #0x2000, sr |
| 277 | movea.l #0xc00004, a0 |
| 278 | move.w #0x8164, (a0) |
| 279 | move.w #0x8144, (a0) |
| 280 | move.w #480/2/10-1, d0 |
| 281 | 0: |
| 282 | dbra d0, 0b |
| 283 | move.w #0x8164, (0xFFC00004).l |
| 284 | move.w #0x8014, (0xFFC00004).l |
| 285 | move.w #0x2700, sr |
| 286 | rts |
| 287 | |
| 288 | .global test_f_vint |
| 289 | test_f_vint: |
| 290 | move.w (a1), d0 |
| 291 | rte |
| 292 | .global test_f_vint_end |
| 293 | test_f_vint_end: |
| 294 | |
| 295 | .global test_f |
| 296 | test_f: |
| 297 | movea.l #0xc00005, a0 |
| 298 | movea.l #0xc00004, a1 |
| 299 | move.w #0x2000, sr |
| 300 | 0: |
| 301 | btst #3, (a0) |
| 302 | bne 0b |
| 303 | 0: |
| 304 | btst #3, (a0) |
| 305 | beq 0b |
| 306 | movem.l d2-d7/a2, -(sp) |
| 307 | move.l (a1), d1 |
| 308 | move.l (a1), d2 |
| 309 | move.l (a1), d3 |
| 310 | move.l (a1), d4 |
| 311 | move.l (a1), d5 |
| 312 | move.l (a1), d6 |
| 313 | move.w #0x2700, sr |
| 314 | movea.l #0xff0000, a0 |
| 315 | move.b d0, (a0)+ |
| 316 | move.b #0, (a0)+ |
| 317 | .macro test_lb_s sr, dr |
| 318 | swap \sr |
| 319 | move.b \sr, (\dr)+ |
| 320 | swap \sr |
| 321 | move.b \sr, (\dr)+ |
| 322 | .endm |
| 323 | test_lb_s d1, a0 |
| 324 | test_lb_s d2, a0 |
| 325 | test_lb_s d3, a0 |
| 326 | test_lb_s d4, a0 |
| 327 | test_lb_s d5, a0 |
| 328 | movem.l (sp)+, d2-d7/a2 |
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329 | rts |
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330 | |
| 331 | .global test_hb |
| 332 | test_hb: |
| 333 | movem.l d2-d7, -(sp) |
| 334 | movea.l #0xc00004, a0 |
| 335 | movea.l #0xc00008, a1 |
| 336 | moveq.l #1, d0 |
| 337 | 0: |
| 338 | cmp.b (a1), d0 |
| 339 | beq 0b |
| 340 | 0: |
| 341 | cmp.b (a1), d0 |
| 342 | bne 0b |
| 343 | move.l (a0), d0 |
| 344 | move.l (a0), d1 |
| 345 | move.l (a0), d2 |
| 346 | movea.l #0xff0000, a1 |
| 347 | movea.l #0xff0000, a1 |
| 348 | nop |
| 349 | nop |
| 350 | move.l (a0), d3 |
| 351 | move.l (a0), d4 |
| 352 | move.l (a0), d5 |
| 353 | move.l (a0), d6 |
| 354 | move.l (a0), d7 |
| 355 | test_lb_s d0, a1 |
| 356 | test_lb_s d1, a1 |
| 357 | test_lb_s d2, a1 |
| 358 | test_lb_s d3, a1 |
| 359 | test_lb_s d4, a1 |
| 360 | test_lb_s d5, a1 |
| 361 | test_lb_s d6, a1 |
| 362 | test_lb_s d7, a1 |
| 363 | movem.l (sp)+, d2-d7 |
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364 | rts |
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365 | |
| ffd4b35c |
366 | # vim:filetype=asmM68k:ts=4:sw=4:expandtab |
notaz.gp2x.de / megadrive.git / blame