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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 |
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76 | /* different timing due to extra fetch of offset, */ |
77 | /* less troulesome to emulate */ |
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78 | movea.l a0, a1 |
79 | subq.l #1, a1 |
80 | move.w d0, 1(a1) |
81 | #endif |
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82 | move.l (a0), d0 |
83 | move.l (a0), d1 |
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84 | |
85 | ldarg 2, 0, a1 |
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86 | move.l d0, (a1)+ |
87 | move.l d1, (a1)+ |
88 | rts |
89 | |
90 | .global move_sr /* u16 sr */ |
91 | move_sr: |
92 | ldargw 0, 0, d0 |
93 | move.w d0, sr |
94 | rts |
95 | |
96 | .global move_sr_and_read /* u16 sr, u32 a */ |
97 | move_sr_and_read: |
98 | ldargw 0, 0, d0 |
99 | ldarg 1, 0, a0 |
100 | move.w d0, sr |
101 | move.w (a0), d0 |
102 | rts |
103 | |
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104 | .global read_sr |
105 | read_sr: |
106 | move.w sr, d0 |
107 | rts |
108 | |
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109 | .global memcpy_ /* void *dst, const void *src, u16 size */ |
110 | memcpy_: |
111 | ldarg 0, 0, a0 |
112 | ldarg 1, 0, a1 |
113 | ldargw 2, 0, d0 |
114 | subq.w #1, d0 |
115 | 0: |
116 | move.b (a1)+, (a0)+ /* not in a hurry */ |
117 | dbra d0, 0b |
118 | rts |
119 | |
120 | .global memset_ /* void *dst, int d, u16 size */ |
121 | memset_: |
122 | ldarg 0, 0, a0 |
123 | ldargw 1, 0, d1 |
124 | ldargw 2, 0, d0 |
125 | subq.w #1, d0 |
126 | 0: |
127 | move.b d1, (a0)+ /* not in a hurry */ |
128 | dbra d0, 0b |
129 | rts |
130 | |
131 | # tests |
132 | |
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133 | .global test_vcnt_vb |
134 | test_vcnt_vb: |
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135 | movem.l d2-d7/a2, -(sp) |
136 | movea.l #0xc00007, a0 |
137 | movea.l #0xc00008, a1 |
138 | movea.l #0xff0000, a2 |
139 | moveq.l #0, d4 /* d4 = count */ |
140 | moveq.l #0, d5 /* d5 = vcnt_expect */ |
141 | /* d6 = old */ |
142 | move.l #1<<(3+16), d7 /* d7 = SR_VB */ |
143 | 0: |
144 | btst #3, (a0) |
145 | beq 0b /* not blanking */ |
146 | 0: |
147 | btst #3, (a0) |
148 | bne 0b /* blanking */ |
149 | |
150 | addq.l #1, a0 |
151 | 0: |
152 | tst.b (a0) |
153 | bne 0b /* not line 0 */ |
154 | |
155 | subq.l #2, a0 |
156 | move.l (a0), d6 |
157 | move.l d6, (a2)+ /* d0 = old */ |
158 | ### |
159 | 0: |
160 | move.b (a1), d2 /* 8 d2 = vcnt */ |
161 | cmp.b (a1), d2 /* 8 reread for corruption */ |
162 | bne 0b /* 10 on changing vcounter? */ |
163 | cmp.b d2, d5 /* 4 vcnt == vcnt_expect? */ |
164 | beq 0b /* 10 */ |
165 | move.l (a0), d0 /* 12 */ |
166 | tst.b d2 /* 4 */ |
167 | beq 3f |
168 | 1: |
169 | addq.l #1, d4 /* count++ */ |
170 | addq.l #1, d5 |
171 | cmp.b d2, d5 |
172 | bne 2f /* vcnt == vcnt_expect + 1 */ |
173 | move.l d0, d1 |
174 | eor.l d6, d1 |
175 | and.l d7, d1 /* (old ^ val) & vb */ |
176 | bne 2f |
177 | move.l d0, d6 /* old = val */ |
178 | bra 0b |
179 | |
180 | 2: /* vcnt jump or vb change */ |
181 | move.l d6, (a2)+ /* *ram++ = old */ |
182 | move.l d0, (a2)+ /* *ram++ = val */ |
183 | move.b d2, d5 /* vcnt_expect = vcnt */ |
184 | move.l d0, d6 /* old = val */ |
185 | bra 0b |
186 | |
187 | 3: /* vcnt == 0 */ |
188 | move.l d0, d1 |
189 | and.l d7, d1 |
190 | bne 1b /* still in VB */ |
191 | |
192 | move.l d0, (a2)+ /* *ram++ = val */ |
193 | move.l d4, (a2)+ /* *ram++ = count */ |
194 | |
195 | movem.l (sp)+, d2-d7/a2 |
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196 | rts |
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197 | |
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198 | .global test_hint |
199 | test_hint: |
200 | move.w d0, -(sp) /* 8 */ |
201 | move.w (0xc00008).l, d0 /* 16 */ |
202 | addq.w #1, (0xf000).w /* 16 */ |
203 | tst.w (0xf002).w /* 12 */ |
204 | bne 0f /* 10 */ |
205 | move.w d0, (0xf002).w /* 12 */ |
206 | 0: |
207 | move.w d0, (0xf004).w /* 12 */ |
208 | move.w (sp)+, d0 /* 8 */ |
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209 | rte /* 20 114+44 */ |
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210 | .global test_hint_end |
211 | test_hint_end: |
212 | |
213 | .global test_vint |
214 | test_vint: |
215 | move.w d0, -(sp) /* 8 */ |
216 | move.w (0xc00008).l, d0 /* 16 */ |
217 | addq.w #1, (0xf008).w /* 16 */ |
218 | tst.w (0xf00a).w /* 12 */ |
219 | bne 0f /* 10 */ |
220 | move.w d0, (0xf00a).w /* 12 */ |
221 | 0: |
222 | move.w d0, (0xf00c).w /* 12 */ |
223 | move.w (sp)+, d0 /* 8 */ |
224 | rte /* 20 114 */ |
225 | .global test_vint_end |
226 | test_vint_end: |
227 | |
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228 | .global x32x_enable |
229 | x32x_enable: |
230 | movea.l #0xa15100, a0 |
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231 | movea.l #0xa15122, a1 |
232 | move.w #1, (a0) /* ADEN */ |
233 | # wait for min(20_sh2_cycles, pll_setup_time) |
234 | # pll time is unclear, icd_mars.prg mentions 10ms which sounds |
235 | # way too much. Hope 40 68k cycles is enough |
236 | move.w #40/10, d0 |
237 | 0: |
238 | dbra d0, 0b |
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239 | move.w #3, (a0) /* ADEN, nRES */ |
240 | 0: |
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241 | move.w #0xffff, d0 /* waste some cycles */ |
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242 | tst.w (a1) |
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243 | beq 0b /* master BIOS busy */ |
244 | |
245 | 0: /* for slave, use a limit, as it */ |
246 | tst.w 4(a1) /* won't respond on master error. */ |
247 | dbne d0, 0b /* slave BIOS busy */ |
248 | |
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249 | or.w #1, 6(a0) /* RV */ |
250 | rts |
251 | .global x32x_enable_end |
252 | x32x_enable_end: |
253 | |
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254 | .global x32x_disable |
255 | x32x_disable: |
256 | movea.l #0xa15100, a0 |
257 | move.w #1, (a0) /* ADEN (reset sh2) */ |
258 | move.w #0, (a0) /* adapter disable, reset sh2 */ |
259 | move.w #1, d0 |
260 | 0: |
261 | dbra d0, 0b |
262 | move.w #2, (a0) /* nRES - sh2s should see no ADEN and sleep */ |
263 | rts |
264 | .global x32x_disable_end |
265 | x32x_disable_end: |
266 | |
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267 | .global test_32x_b_c0 |
268 | test_32x_b_c0: |
269 | ldarg 0, 0, a1 |
270 | ldargw 1, 0, d0 |
271 | jsr (0xc0).l /* move.b d0, (a1); RV=0 */ |
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272 | bset #0, (0xa15107).l /* RV=1 */ |
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273 | rts |
274 | .global test_32x_b_c0_end |
275 | test_32x_b_c0_end: |
276 | |
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277 | # some nastyness from Fatal Rewind |
278 | .global test_h_v_2 |
279 | test_h_v_2: |
280 | move.w #0x2000, sr |
281 | move.w #0x8014, (0xFFC00004).l |
282 | move.w #0x8164, (0xFFC00004).l |
283 | move.w #1, d0 |
284 | 0: |
285 | dbra d0, 0b |
286 | move.w #0x2700, sr |
287 | rts |
288 | |
289 | .global test_v_h_2 |
290 | test_v_h_2: |
291 | move.w #0x2000, sr |
292 | movea.l #0xc00004, a0 |
293 | move.w #0x8164, (a0) |
294 | move.w #0x8144, (a0) |
295 | move.w #480/2/10-1, d0 |
296 | 0: |
297 | dbra d0, 0b |
298 | move.w #0x8164, (0xFFC00004).l |
299 | move.w #0x8014, (0xFFC00004).l |
300 | move.w #0x2700, sr |
301 | rts |
302 | |
303 | .global test_f_vint |
304 | test_f_vint: |
305 | move.w (a1), d0 |
306 | rte |
307 | .global test_f_vint_end |
308 | test_f_vint_end: |
309 | |
310 | .global test_f |
311 | test_f: |
312 | movea.l #0xc00005, a0 |
313 | movea.l #0xc00004, a1 |
314 | move.w #0x2000, sr |
315 | 0: |
316 | btst #3, (a0) |
317 | bne 0b |
318 | 0: |
319 | btst #3, (a0) |
320 | beq 0b |
321 | movem.l d2-d7/a2, -(sp) |
322 | move.l (a1), d1 |
323 | move.l (a1), d2 |
324 | move.l (a1), d3 |
325 | move.l (a1), d4 |
326 | move.l (a1), d5 |
327 | move.l (a1), d6 |
328 | move.w #0x2700, sr |
329 | movea.l #0xff0000, a0 |
330 | move.b d0, (a0)+ |
331 | move.b #0, (a0)+ |
332 | .macro test_lb_s sr, dr |
333 | swap \sr |
334 | move.b \sr, (\dr)+ |
335 | swap \sr |
336 | move.b \sr, (\dr)+ |
337 | .endm |
338 | test_lb_s d1, a0 |
339 | test_lb_s d2, a0 |
340 | test_lb_s d3, a0 |
341 | test_lb_s d4, a0 |
342 | test_lb_s d5, a0 |
343 | movem.l (sp)+, d2-d7/a2 |
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344 | rts |
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345 | |
346 | .global test_hb |
347 | test_hb: |
348 | movem.l d2-d7, -(sp) |
349 | movea.l #0xc00004, a0 |
350 | movea.l #0xc00008, a1 |
351 | moveq.l #1, d0 |
352 | 0: |
353 | cmp.b (a1), d0 |
354 | beq 0b |
355 | 0: |
356 | cmp.b (a1), d0 |
357 | bne 0b |
358 | move.l (a0), d0 |
359 | move.l (a0), d1 |
360 | move.l (a0), d2 |
361 | movea.l #0xff0000, a1 |
362 | movea.l #0xff0000, a1 |
363 | nop |
364 | nop |
365 | move.l (a0), d3 |
366 | move.l (a0), d4 |
367 | move.l (a0), d5 |
368 | move.l (a0), d6 |
369 | move.l (a0), d7 |
370 | test_lb_s d0, a1 |
371 | test_lb_s d1, a1 |
372 | test_lb_s d2, a1 |
373 | test_lb_s d3, a1 |
374 | test_lb_s d4, a1 |
375 | test_lb_s d5, a1 |
376 | test_lb_s d6, a1 |
377 | test_lb_s d7, a1 |
378 | movem.l (sp)+, d2-d7 |
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379 | rts |
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380 | |
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381 | # vim:filetype=asmM68k:ts=4:sw=4:expandtab |