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1 | @* |
2 | @* Memory I/O handlers for Sega/Mega CD emulation |
3 | @* (C) notaz, 2007-2009 |
4 | @* |
5 | @* This work is licensed under the terms of MAME license. |
6 | @* See COPYING file in the top-level directory. |
7 | @* |
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8 | |
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9 | #include "../pico_int_o32.h" |
10 | |
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11 | .equiv PCM_STEP_SHIFT, 11 |
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12 | |
13 | .text |
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14 | .align 2 |
15 | |
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16 | .global PicoRead8_mcd_io |
17 | .global PicoRead16_mcd_io |
18 | .global PicoWrite8_mcd_io |
19 | .global PicoWrite16_mcd_io |
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20 | |
21 | .global PicoReadS68k8_pr |
22 | .global PicoReadS68k16_pr |
23 | .global PicoWriteS68k8_pr |
24 | .global PicoWriteS68k16_pr |
25 | |
26 | .global PicoReadM68k8_cell0 |
27 | .global PicoReadM68k8_cell1 |
28 | .global PicoReadM68k16_cell0 |
29 | .global PicoReadM68k16_cell1 |
30 | .global PicoWriteM68k8_cell0 |
31 | .global PicoWriteM68k8_cell1 |
32 | .global PicoWriteM68k16_cell0 |
33 | .global PicoWriteM68k16_cell1 |
34 | |
35 | .global PicoReadS68k8_dec0 |
36 | .global PicoReadS68k8_dec1 |
37 | .global PicoReadS68k16_dec0 |
38 | .global PicoReadS68k16_dec1 |
39 | .global PicoWriteS68k8_dec_m0b0 |
40 | .global PicoWriteS68k8_dec_m1b0 |
41 | .global PicoWriteS68k8_dec_m2b0 |
42 | .global PicoWriteS68k8_dec_m0b1 |
43 | .global PicoWriteS68k8_dec_m1b1 |
44 | .global PicoWriteS68k8_dec_m2b1 |
45 | .global PicoWriteS68k16_dec_m0b0 |
46 | .global PicoWriteS68k16_dec_m1b0 |
47 | .global PicoWriteS68k16_dec_m2b0 |
48 | .global PicoWriteS68k16_dec_m0b1 |
49 | .global PicoWriteS68k16_dec_m1b1 |
50 | .global PicoWriteS68k16_dec_m2b1 |
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51 | |
52 | @ externs, just for reference |
53 | .extern Pico |
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54 | .extern cdc_host_r |
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55 | .extern m68k_reg_write8 |
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56 | .extern s68k_reg_read16 |
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57 | .extern s68k_reg_write8 |
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58 | .extern s68k_reg_write16 |
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59 | .extern s68k_poll_detect |
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60 | .extern pcd_pcm_write |
61 | .extern pcd_pcm_read |
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62 | .extern PicoCpuCS68k |
63 | .extern PicoRead8_io |
64 | .extern PicoRead16_io |
65 | .extern PicoWrite8_io |
66 | .extern PicoWrite16_io |
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67 | .extern m68k_comm_check |
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68 | |
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69 | |
70 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
71 | |
72 | @ utilities |
73 | |
74 | @ r0=addr[in,out], r1,r2=tmp |
75 | .macro cell_map |
76 | ands r1, r0, #0x01c000 |
77 | ldrne pc, [pc, r1, lsr #12] |
78 | beq 0f @ most common? |
79 | .long 0f |
80 | .long 0f |
81 | .long 0f |
82 | .long 0f |
83 | .long 1f |
84 | .long 1f |
85 | .long 2f |
86 | .long 3f |
87 | 1: @ x16 cells |
88 | and r1, r0, #0x7e00 @ col |
89 | and r2, r0, #0x01fc @ row |
90 | orr r2, r2, #0x0400 |
91 | orr r1, r2, r1, ror #13 |
92 | b 9f |
93 | 2: @ x8 cells |
94 | and r1, r0, #0x3f00 @ col |
95 | and r2, r0, #0x00fc @ row |
96 | orr r2, r2, #0x0600 |
97 | orr r1, r2, r1, ror #12 |
98 | b 9f |
99 | 3: @ x4 cells |
100 | and r1, r0, #0x1f80 @ col |
101 | and r2, r0, #0x007c @ row |
102 | orr r1, r2, r1, ror #11 |
103 | and r2, r0,#0x1e000 |
104 | orr r1, r1, r2, lsr #6 |
105 | b 9f |
106 | 0: @ x32 cells |
107 | and r1, r0, #0xfc00 @ col |
108 | and r2, r0, #0x03fc @ row |
109 | orr r1, r2, r1, ror #14 |
110 | 9: |
111 | and r0, r0, #3 |
112 | orr r0, r0, r1, ror #26 @ rol 4+2 |
113 | .endm |
114 | |
115 | |
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116 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
117 | |
118 | |
119 | m_read_null: |
120 | mov r0, #0 |
121 | bx lr |
122 | |
123 | |
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124 | PicoReadM68k8_cell0: @ 0x220000 - 0x23ffff, cell arranged |
125 | mov r3, #0x0c0000 |
126 | b 0f |
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127 | |
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128 | PicoReadM68k8_cell1: @ 0x220000 - 0x23ffff, cell arranged |
129 | mov r3, #0x0e0000 |
130 | 0: |
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131 | cell_map |
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132 | ldr r1, =Pico |
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133 | add r0, r0, r3 |
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134 | ldr r1, [r1, #OFS_Pico_rom] @ Pico.mcd (used everywhere) |
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135 | eor r0, r0, #1 |
136 | ldrb r0, [r1, r0] |
137 | bx lr |
138 | |
139 | |
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140 | PicoRead8_mcd_io: |
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141 | and r1, r0, #0xff00 |
142 | cmp r1, #0x2000 @ a120xx? |
143 | bne PicoRead8_io |
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144 | |
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145 | ldr r1, =Pico |
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146 | and r0, r0, #0x3f |
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147 | ldr r1, [r1, #OFS_Pico_rom] @ Pico.mcd |
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148 | cmp r0, #0x0e |
149 | ldrlt pc, [pc, r0, lsl #2] |
150 | b m_m68k_read8_hi |
151 | .long m_m68k_read8_r00 |
152 | .long m_m68k_read8_r01 |
153 | .long m_m68k_read8_r02 |
154 | .long m_m68k_read8_r03 |
155 | .long m_m68k_read8_r04 |
156 | .long m_read_null @ unused bits |
157 | .long m_m68k_read8_r06 |
158 | .long m_m68k_read8_r07 |
159 | .long m_m68k_read8_r08 |
160 | .long m_m68k_read8_r09 |
161 | .long m_read_null @ reserved |
162 | .long m_read_null |
163 | .long m_m68k_read8_r0c |
164 | .long m_m68k_read8_r0d |
165 | m_m68k_read8_r00: |
166 | add r1, r1, #0x110000 |
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167 | ldr r0, [r1, #0x30] |
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168 | and r0, r0, #0x04000000 @ we need irq2 mask state |
169 | mov r0, r0, lsr #19 |
170 | bx lr |
171 | m_m68k_read8_r01: |
172 | add r1, r1, #0x110000 |
173 | add r1, r1, #0x002200 |
174 | ldrb r0, [r1, #2] @ Pico_mcd->m.busreq |
175 | bx lr |
176 | m_m68k_read8_r02: |
177 | add r1, r1, #0x110000 |
178 | ldrb r0, [r1, #2] |
179 | bx lr |
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180 | m_m68k_read8_r03: |
181 | add r1, r1, #0x110000 |
182 | push {r1, lr} |
183 | bl m68k_comm_check |
184 | pop {r1, lr} |
185 | ldrb r0, [r1, #3] |
186 | and r0, r0, #0xc7 |
187 | bx lr |
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188 | m_m68k_read8_r04: |
189 | add r1, r1, #0x110000 |
190 | ldrb r0, [r1, #4] |
191 | bx lr |
192 | m_m68k_read8_r06: |
193 | ldrb r0, [r1, #0x73] @ IRQ vector |
194 | bx lr |
195 | m_m68k_read8_r07: |
196 | ldrb r0, [r1, #0x72] |
197 | bx lr |
198 | m_m68k_read8_r08: |
199 | mov r0, #0 |
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200 | bl cdc_host_r |
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201 | mov r0, r0, lsr #8 |
202 | bx lr |
203 | m_m68k_read8_r09: |
204 | mov r0, #0 |
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205 | b cdc_host_r |
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206 | m_m68k_read8_r0c: |
207 | add r1, r1, #0x110000 |
208 | add r1, r1, #0x002200 |
209 | ldr r0, [r1, #0x14] @ Pico_mcd->m.timer_stopwatch |
210 | mov r0, r0, lsr #24 |
211 | bx lr |
212 | m_m68k_read8_r0d: |
213 | add r1, r1, #0x110000 |
214 | add r1, r1, #0x002200 |
215 | ldr r0, [r1, #0x14] |
216 | mov r0, r0, lsr #16 |
217 | bx lr |
218 | m_m68k_read8_hi: |
219 | cmp r0, #0x30 |
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220 | add r1, r1, #0x110000 |
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221 | movge r0, #0 |
222 | bxge lr |
223 | add r1, r0 |
224 | push {r1, lr} |
225 | bl m68k_comm_check |
226 | pop {r1, lr} |
227 | ldrb r0, [r1] |
228 | bx lr |
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229 | |
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230 | |
231 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
232 | |
233 | |
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234 | PicoReadM68k16_cell0: @ 0x220000 - 0x23ffff, cell arranged |
235 | mov r3, #0x0c0000 |
236 | b 0f |
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237 | |
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238 | PicoReadM68k16_cell1: @ 0x220000 - 0x23ffff, cell arranged |
239 | mov r3, #0x0e0000 |
240 | 0: |
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241 | cell_map |
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242 | ldr r1, =Pico |
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243 | add r0, r0, r3 |
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244 | ldr r1, [r1, #OFS_Pico_rom] @ Pico.mcd |
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245 | bic r0, r0, #1 |
246 | ldrh r0, [r1, r0] |
247 | bx lr |
248 | |
249 | |
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250 | PicoRead16_mcd_io: |
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251 | and r1, r0, #0xff00 |
252 | cmp r1, #0x2000 @ a120xx |
253 | bne PicoRead16_io |
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254 | |
255 | m_m68k_read16_m68k_regs: |
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256 | ldr r1, =Pico |
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257 | and r0, r0, #0x3e |
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258 | ldr r1, [r1, #OFS_Pico_rom] @ Pico.mcd |
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259 | cmp r0, #0x0e |
260 | ldrlt pc, [pc, r0, lsl #1] |
261 | b m_m68k_read16_hi |
262 | .long m_m68k_read16_r00 |
263 | .long m_m68k_read16_r02 |
264 | .long m_m68k_read16_r04 |
265 | .long m_m68k_read16_r06 |
266 | .long m_m68k_read16_r08 |
267 | .long m_read_null @ reserved |
268 | .long m_m68k_read16_r0c |
269 | m_m68k_read16_r00: |
270 | add r1, r1, #0x110000 |
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271 | ldr r0, [r1, #0x30] |
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272 | add r1, r1, #0x002200 |
273 | ldrb r1, [r1, #2] @ Pico_mcd->m.busreq |
274 | and r0, r0, #0x04000000 @ we need irq2 mask state |
275 | orr r0, r1, r0, lsr #11 |
276 | bx lr |
cc5ffc3c |
277 | m_m68k_read16_r02: |
278 | add r1, r1, #0x110000 |
279 | push {r1, lr} |
280 | bl m68k_comm_check |
281 | pop {r1, lr} |
282 | ldrb r2, [r1, #3] |
283 | ldrb r0, [r1, #2] |
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284 | and r2, r2, #0xc7 |
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285 | orr r0, r2, r0, lsl #8 |
286 | bx lr |
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287 | m_m68k_read16_r04: |
288 | add r1, r1, #0x110000 |
289 | ldrb r0, [r1, #4] |
290 | mov r0, r0, lsl #8 |
291 | bx lr |
292 | m_m68k_read16_r06: |
293 | ldrh r0, [r1, #0x72] @ IRQ vector |
294 | bx lr |
295 | m_m68k_read16_r08: |
296 | mov r0, #0 |
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297 | b cdc_host_r |
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298 | m_m68k_read16_r0c: |
299 | add r1, r1, #0x110000 |
300 | add r1, r1, #0x002200 |
301 | ldr r0, [r1, #0x14] |
302 | mov r0, r0, lsr #16 |
303 | bx lr |
304 | m_m68k_read16_hi: |
305 | cmp r0, #0x30 |
cc5ffc3c |
306 | add r1, r1, #0x110000 |
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307 | movge r0, #0 |
308 | bxge lr |
cc5ffc3c |
309 | |
310 | add r1, r0, r1 |
311 | push {r1, lr} |
312 | bl m68k_comm_check |
313 | pop {r0, lr} |
314 | ldrh r0, [r0] |
315 | mov r1, r0, lsr #8 |
316 | and r0, r0, #0xff |
317 | orr r0, r1, r0, lsl #8 |
318 | bx lr |
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319 | |
320 | |
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321 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
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322 | |
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323 | |
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324 | PicoWriteM68k8_cell0: @ 0x220000 - 0x23ffff, cell arranged |
325 | mov r12,#0x0c0000 |
326 | b 0f |
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327 | |
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328 | PicoWriteM68k8_cell1: @ 0x220000 - 0x23ffff, cell arranged |
329 | mov r12,#0x0e0000 |
330 | 0: |
331 | mov r3, r1 |
332 | cell_map |
88fd63ad |
333 | ldr r2, =Pico |
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334 | add r0, r0, r12 |
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335 | ldr r2, [r2, #OFS_Pico_rom] @ Pico.mcd |
0ace9b9a |
336 | ldr r2, [r2] |
337 | eor r0, r0, #1 |
338 | strb r3, [r2, r0] |
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339 | bx lr |
340 | |
341 | |
fa8fb754 |
342 | PicoWrite8_mcd_io: |
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343 | and r2, r0, #0xff00 |
344 | cmp r2, #0x2000 @ a120xx? |
345 | beq m68k_reg_write8 |
346 | b PicoWrite8_io |
347 | |
348 | |
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349 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
350 | |
351 | |
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352 | PicoWriteM68k16_cell0: @ 0x220000 - 0x23ffff, cell arranged |
353 | mov r12, #0x0c0000 |
354 | b 0f |
355 | |
356 | PicoWriteM68k16_cell1: @ 0x220000 - 0x23ffff, cell arranged |
357 | mov r12, #0x0e0000 |
358 | 0: |
359 | mov r3, r1 |
360 | cell_map |
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361 | ldr r1, =Pico |
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362 | add r0, r0, r12 |
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363 | ldr r1, [r1, #OFS_Pico_rom] @ Pico.mcd |
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364 | bic r0, r0, #1 |
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365 | strh r3, [r1, r0] |
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366 | bx lr |
367 | |
368 | |
fa8fb754 |
369 | PicoWrite16_mcd_io: |
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370 | and r2, r0, #0xff00 |
371 | cmp r2, #0x2000 @ a120xx? |
372 | bne PicoWrite16_io |
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373 | |
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374 | m_m68k_write16_regs: |
375 | and r0, r0, #0x3e |
376 | cmp r0, #0x0e |
377 | beq m_m68k_write16_regs_spec |
378 | and r3, r1, #0xff |
379 | add r2, r0, #1 |
380 | stmfd sp!,{r2,r3,lr} |
381 | mov r1, r1, lsr #8 |
382 | bl m68k_reg_write8 |
383 | ldmfd sp!,{r0,r1,lr} |
384 | b m68k_reg_write8 |
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385 | |
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386 | m_m68k_write16_regs_spec: @ special case |
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387 | mov r1, r1, lsr #8 |
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388 | b m68k_reg_write8 |
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389 | |
390 | |
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391 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
392 | @ Sub 68k |
393 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
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394 | |
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395 | |
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396 | PicoReadS68k8_dec0: @ 0x080000 - 0x0bffff |
397 | mov r3, #0x080000 @ + ^ / 2 |
398 | b 0f |
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399 | |
0ace9b9a |
400 | PicoReadS68k8_dec1: |
401 | mov r3, #0x0a0000 @ + ^ / 2 |
402 | 0: |
88fd63ad |
403 | ldr r2, =Pico |
5c69a605 |
404 | eor r0, r0, #2 |
88fd63ad |
405 | ldr r2, [r2, #OFS_Pico_rom] @ Pico.mcd |
5c69a605 |
406 | movs r0, r0, lsr #1 @ +4-6 <<16 |
0ace9b9a |
407 | add r2, r2, r3 @ map to our address |
5c69a605 |
408 | ldrb r0, [r2, r0] |
409 | movcc r0, r0, lsr #4 |
410 | andcs r0, r0, #0xf |
411 | bx lr |
5c69a605 |
412 | |
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413 | |
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414 | PicoReadS68k8_pr: |
415 | and r2, r0, #0xfe00 |
416 | cmp r2, #0x8000 |
417 | bne m_s68k_read8_pcm |
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418 | |
419 | m_s68k_read8_regs: |
420 | bic r0, r0, #0xff0000 |
421 | bic r0, r0, #0x008000 |
2433f409 |
422 | sub r2, r0, #0x0e |
423 | cmp r2, #(0x30-0x0e) |
424 | blo m_s68k_read8_comm |
4ff2d527 |
425 | stmfd sp!,{r0,lr} |
426 | bic r0, r0, #1 |
a93a80de |
427 | bl s68k_reg_read16 |
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428 | ldmfd sp!,{r1,lr} |
429 | tst r1, #1 |
430 | moveq r0, r0, lsr #8 |
431 | and r0, r0, #0xff |
432 | bx lr |
433 | |
2433f409 |
434 | m_s68k_read8_comm: |
88fd63ad |
435 | ldr r1, =Pico |
436 | ldr r1, [r1, #OFS_Pico_rom] @ Pico.mcd |
2433f409 |
437 | add r1, r1, #0x110000 |
438 | ldrb r1, [r1, r0] |
334d9fb6 |
439 | bic r0, r0, #1 |
2433f409 |
440 | b s68k_poll_detect |
441 | |
4ff2d527 |
442 | |
0ace9b9a |
443 | m_s68k_read8_pcm: |
444 | tst r0, #0x8000 |
445 | bne m_read_null |
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446 | |
0ace9b9a |
447 | @ must not trash r3 and r12 |
88fd63ad |
448 | ldr r1, =Pico |
0ace9b9a |
449 | bic r0, r0, #0xff0000 |
88fd63ad |
450 | ldr r1, [r1, #OFS_Pico_rom] @ Pico.mcd |
0ace9b9a |
451 | mov r2, #0x110000 |
452 | orr r2, r2, #0x002200 |
453 | cmp r0, #0x2000 |
454 | bge m_s68k_read8_pcm_ram |
455 | cmp r0, #0x20 |
33be04ca |
456 | movge r0, r0, lsr #1 |
457 | bge pcd_pcm_read |
458 | mov r0, #0 |
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459 | bx lr |
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460 | |
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461 | m_s68k_read8_pcm_ram: |
462 | orr r2, r2, #0x40 |
463 | ldr r2, [r1, r2] |
464 | add r1, r1, #0x100000 @ pcm_ram |
465 | and r2, r2, #0x0f000000 @ bank |
466 | add r1, r1, r2, lsr #12 |
467 | bic r0, r0, #0x00e000 |
468 | mov r0, r0, lsr #1 |
469 | ldrb r0, [r1, r0] |
470 | bx lr |
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471 | |
472 | |
473 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
474 | |
475 | |
0ace9b9a |
476 | PicoReadS68k16_dec0: @ 0x080000 - 0x0bffff |
477 | mov r3, #0x080000 @ + ^ / 2 |
478 | b 0f |
5c69a605 |
479 | |
0ace9b9a |
480 | PicoReadS68k16_dec1: |
481 | mov r3, #0x0a0000 @ + ^ / 2 |
482 | 0: |
88fd63ad |
483 | ldr r2, =Pico |
5c69a605 |
484 | eor r0, r0, #2 |
88fd63ad |
485 | ldr r2, [r2, #OFS_Pico_rom] @ Pico.mcd |
5c69a605 |
486 | mov r0, r0, lsr #1 @ +4-6 <<16 |
0ace9b9a |
487 | add r2, r2, r3 @ map to our address |
488 | ldrb r0, [r2, r0] |
5c69a605 |
489 | orr r0, r0, r0, lsl #4 |
490 | bic r0, r0, #0xf0 |
5c69a605 |
491 | bx lr |
4ff2d527 |
492 | |
493 | |
0ace9b9a |
494 | PicoReadS68k16_pr: |
495 | and r2, r0, #0xfe00 |
496 | cmp r2, #0x8000 |
497 | @ pcm is on 8-bit bus, would this be same as byte access? |
498 | bne m_s68k_read8_pcm |
4ff2d527 |
499 | |
0ace9b9a |
500 | m_s68k_read16_regs: |
4ff2d527 |
501 | bic r0, r0, #0xff0000 |
502 | bic r0, r0, #0x008000 |
503 | bic r0, r0, #0x000001 |
0ace9b9a |
504 | cmp r0, #8 |
505 | bne s68k_reg_read16 |
506 | mov r0, #1 |
3f23709e |
507 | b cdc_host_r |
4ff2d527 |
508 | |
4ff2d527 |
509 | |
510 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
511 | |
512 | |
0ace9b9a |
513 | .macro m_s68k_write8_2M_decode |
88fd63ad |
514 | ldr r2, =Pico |
48e8482f |
515 | eor r0, r0, #2 |
88fd63ad |
516 | ldr r2, [r2, #OFS_Pico_rom] @ Pico.mcd |
48e8482f |
517 | movs r0, r0, lsr #1 @ +4-6 <<16 |
0ace9b9a |
518 | add r2, r2, r3 @ map to our address |
48e8482f |
519 | .endm |
520 | |
0ace9b9a |
521 | PicoWriteS68k8_dec_m2b0: @ overwrite |
522 | ands r1, r1, #0x0f |
523 | bxeq lr |
524 | |
525 | PicoWriteS68k8_dec_m0b0: |
526 | mov r3, #0x080000 |
527 | b 0f |
528 | |
529 | PicoWriteS68k8_dec_m2b1: @ overwrite |
530 | ands r1, r1, #0x0f |
531 | bxeq lr |
532 | |
533 | PicoWriteS68k8_dec_m0b1: |
534 | mov r3, #0x0a0000 |
535 | 0: |
536 | m_s68k_write8_2M_decode |
48e8482f |
537 | ldrb r0, [r2, r0]! |
538 | and r1, r1, #0x0f |
539 | movcc r1, r1, lsl #4 |
540 | andcc r3, r0, #0x0f |
541 | andcs r3, r0, #0xf0 |
542 | orr r3, r3, r1 |
48e8482f |
543 | strneb r3, [r2] |
544 | bx lr |
48e8482f |
545 | |
0ace9b9a |
546 | PicoWriteS68k8_dec_m1b0: @ underwrite |
547 | mov r3, #0x080000 |
548 | b 0f |
549 | |
550 | PicoWriteS68k8_dec_m1b1: |
551 | mov r3, #0x0a0000 |
552 | 0: |
48e8482f |
553 | ands r1, r1, #0x0f |
554 | bxeq lr |
0ace9b9a |
555 | m_s68k_write8_2M_decode |
48e8482f |
556 | ldrb r0, [r2, r0]! |
557 | movcc r1, r1, lsl #4 |
558 | andcc r3, r0, #0x0f |
559 | andcs r3, r0, #0xf0 |
0ace9b9a |
560 | teq r3, r0 |
561 | bxne lr |
48e8482f |
562 | orr r3, r3, r1 |
48e8482f |
563 | strneb r3, [r2] |
564 | bx lr |
48e8482f |
565 | |
48e8482f |
566 | |
0ace9b9a |
567 | PicoWriteS68k8_pr: |
568 | and r2, r0, #0xfe00 |
569 | cmp r2, #0x8000 |
570 | bne m_s68k_write8_pcm |
48e8482f |
571 | |
0ace9b9a |
572 | m_s68k_write8_regs: |
4ff2d527 |
573 | bic r0, r0, #0xff0000 |
0ace9b9a |
574 | bic r0, r0, #0x008000 |
575 | tst r0, #0x7e00 |
576 | movne r0, #0 |
577 | bxne lr |
a93a80de |
578 | sub r2, r0, #0x59 |
579 | cmp r2, #0x0f |
0ace9b9a |
580 | bhs s68k_reg_write8 |
581 | bic r0, r0, #1 |
582 | orr r1, r1, r1, lsl #8 |
a93a80de |
583 | b s68k_reg_write16 |
4ff2d527 |
584 | |
585 | |
586 | m_s68k_write8_pcm: |
0ace9b9a |
587 | tst r0, #0x8000 |
588 | bxne lr |
4ff2d527 |
589 | bic r0, r0, #0xff0000 |
590 | cmp r0, #0x12 |
591 | movlt r0, r0, lsr #1 |
33be04ca |
592 | blt pcd_pcm_write |
4ff2d527 |
593 | |
594 | cmp r0, #0x2000 |
595 | bxlt lr |
596 | |
597 | m_s68k_write8_pcm_ram: |
88fd63ad |
598 | ldr r3, =Pico |
4ff2d527 |
599 | bic r0, r0, #0x00e000 |
88fd63ad |
600 | ldr r3, [r3, #OFS_Pico_rom] @ Pico.mcd |
4ff2d527 |
601 | mov r0, r0, lsr #1 |
602 | add r2, r3, #0x110000 |
603 | add r2, r2, #0x002200 |
604 | add r2, r2, #0x000040 |
605 | ldr r2, [r2] |
606 | add r3, r3, #0x100000 @ pcm_ram |
607 | and r2, r2, #0x0f000000 @ bank |
608 | add r3, r3, r2, lsr #12 |
609 | strb r1, [r3, r0] |
610 | bx lr |
611 | |
612 | |
4ff2d527 |
613 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
614 | |
615 | |
0ace9b9a |
616 | .macro m_s68k_write16_2M_decode |
88fd63ad |
617 | ldr r2, =Pico |
48e8482f |
618 | eor r0, r0, #2 |
88fd63ad |
619 | ldr r2, [r2, #OFS_Pico_rom] @ Pico.mcd |
48e8482f |
620 | mov r0, r0, lsr #1 @ +4-6 <<16 |
0ace9b9a |
621 | add r2, r2, r3 @ map to our address |
48e8482f |
622 | .endm |
623 | |
0ace9b9a |
624 | PicoWriteS68k16_dec_m0b0: |
625 | mov r3, #0x080000 |
626 | b 0f |
627 | |
628 | PicoWriteS68k16_dec_m0b1: |
629 | mov r3, #0x0a0000 |
630 | 0: |
631 | m_s68k_write16_2M_decode |
48e8482f |
632 | bic r1, r1, #0xf0 |
633 | orr r1, r1, r1, lsr #4 |
634 | strb r1, [r2, r0] |
635 | bx lr |
48e8482f |
636 | |
0ace9b9a |
637 | PicoWriteS68k16_dec_m1b0: @ underwrite |
638 | mov r3, #0x080000 |
639 | b 0f |
640 | |
641 | PicoWriteS68k16_dec_m1b1: |
642 | mov r3, #0x0a0000 |
643 | 0: |
48e8482f |
644 | bics r1, r1, #0xf000 |
645 | bicnes r1, r1, #0x00f0 |
646 | bxeq lr |
647 | orr r1, r1, r1, lsr #4 |
0ace9b9a |
648 | m_s68k_write16_2M_decode |
48e8482f |
649 | ldrb r0, [r2, r0]! |
650 | and r3, r1, #0x0f |
651 | and r1, r1, #0xf0 |
652 | tst r0, #0x0f |
653 | orreq r0, r0, r3 |
654 | tst r0, #0xf0 |
655 | orreq r0, r0, r1 |
656 | strb r0, [r2] |
657 | bx lr |
48e8482f |
658 | |
0ace9b9a |
659 | PicoWriteS68k16_dec_m2b0: @ overwrite |
660 | mov r3, #0x080000 |
661 | b 0f |
662 | |
663 | PicoWriteS68k16_dec_m2b1: |
664 | mov r3, #0x0a0000 |
665 | 0: |
48e8482f |
666 | bics r1, r1, #0xf000 |
667 | bicnes r1, r1, #0x00f0 |
668 | bxeq lr |
669 | orr r1, r1, r1, lsr #4 |
0ace9b9a |
670 | m_s68k_write16_2M_decode |
48e8482f |
671 | ldrb r0, [r2, r0]! |
672 | ands r3, r1, #0x0f |
673 | andne r0, r0, #0xf0 |
674 | orrne r0, r0, r3 |
675 | ands r1, r1, #0xf0 |
676 | andne r0, r0, #0x0f |
677 | orrne r0, r0, r1 |
678 | strb r0, [r2] |
679 | bx lr |
48e8482f |
680 | |
4ff2d527 |
681 | |
0ace9b9a |
682 | PicoWriteS68k16_pr: |
683 | and r2, r0, #0xfe00 |
684 | cmp r2, #0x8000 |
685 | bne m_s68k_write8_pcm |
4ff2d527 |
686 | |
687 | m_s68k_write16_regs: |
688 | bic r0, r0, #0xff0000 |
689 | bic r0, r0, #0x008000 |
5c69a605 |
690 | bic r0, r0, #1 |
4ff2d527 |
691 | tst r0, #0x7e00 |
692 | movne r0, #0 |
693 | bxne lr |
5c69a605 |
694 | cmp r0, #0x0e |
a93a80de |
695 | bne s68k_reg_write16 |
4ff2d527 |
696 | |
5c69a605 |
697 | m_s68k_write16_regs_spec: @ special case |
88fd63ad |
698 | ldr r2, =Pico |
5c69a605 |
699 | mov r0, #0x110000 |
88fd63ad |
700 | ldr r2, [r2, #OFS_Pico_rom] @ Pico.mcd |
5c69a605 |
701 | add r0, r0, #0x00000f |
702 | strb r1, [r2, r0] @ if (a == 0xe) s68k_regs[0xf] = d; |
48e8482f |
703 | bx lr |
4ff2d527 |
704 | |
0ace9b9a |
705 | .pool |
6cadc2da |
706 | |
cff531af |
707 | @ vim:filetype=armasm |