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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 | |
ffd4b35c |
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 |
73 | ldarg 2, 0, a1 |
74 | move.w d0, (a0) |
75 | move.l (a0), d0 |
76 | move.l (a0), d1 |
77 | move.l d0, (a1)+ |
78 | move.l d1, (a1)+ |
79 | rts |
80 | |
81 | .global move_sr /* u16 sr */ |
82 | move_sr: |
83 | ldargw 0, 0, d0 |
84 | move.w d0, sr |
85 | rts |
86 | |
87 | .global move_sr_and_read /* u16 sr, u32 a */ |
88 | move_sr_and_read: |
89 | ldargw 0, 0, d0 |
90 | ldarg 1, 0, a0 |
91 | move.w d0, sr |
92 | move.w (a0), d0 |
93 | rts |
94 | |
95 | .global memcpy_ /* void *dst, const void *src, u16 size */ |
96 | memcpy_: |
97 | ldarg 0, 0, a0 |
98 | ldarg 1, 0, a1 |
99 | ldargw 2, 0, d0 |
100 | subq.w #1, d0 |
101 | 0: |
102 | move.b (a1)+, (a0)+ /* not in a hurry */ |
103 | dbra d0, 0b |
104 | rts |
105 | |
106 | .global memset_ /* void *dst, int d, u16 size */ |
107 | memset_: |
108 | ldarg 0, 0, a0 |
109 | ldargw 1, 0, d1 |
110 | ldargw 2, 0, d0 |
111 | subq.w #1, d0 |
112 | 0: |
113 | move.b d1, (a0)+ /* not in a hurry */ |
114 | dbra d0, 0b |
115 | rts |
116 | |
117 | # tests |
118 | |
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119 | .global do_vcnt_vb |
120 | do_vcnt_vb: |
121 | movem.l d2-d7/a2, -(sp) |
122 | movea.l #0xc00007, a0 |
123 | movea.l #0xc00008, a1 |
124 | movea.l #0xff0000, a2 |
125 | moveq.l #0, d4 /* d4 = count */ |
126 | moveq.l #0, d5 /* d5 = vcnt_expect */ |
127 | /* d6 = old */ |
128 | move.l #1<<(3+16), d7 /* d7 = SR_VB */ |
129 | 0: |
130 | btst #3, (a0) |
131 | beq 0b /* not blanking */ |
132 | 0: |
133 | btst #3, (a0) |
134 | bne 0b /* blanking */ |
135 | |
136 | addq.l #1, a0 |
137 | 0: |
138 | tst.b (a0) |
139 | bne 0b /* not line 0 */ |
140 | |
141 | subq.l #2, a0 |
142 | move.l (a0), d6 |
143 | move.l d6, (a2)+ /* d0 = old */ |
144 | ### |
145 | 0: |
146 | move.b (a1), d2 /* 8 d2 = vcnt */ |
147 | cmp.b (a1), d2 /* 8 reread for corruption */ |
148 | bne 0b /* 10 on changing vcounter? */ |
149 | cmp.b d2, d5 /* 4 vcnt == vcnt_expect? */ |
150 | beq 0b /* 10 */ |
151 | move.l (a0), d0 /* 12 */ |
152 | tst.b d2 /* 4 */ |
153 | beq 3f |
154 | 1: |
155 | addq.l #1, d4 /* count++ */ |
156 | addq.l #1, d5 |
157 | cmp.b d2, d5 |
158 | bne 2f /* vcnt == vcnt_expect + 1 */ |
159 | move.l d0, d1 |
160 | eor.l d6, d1 |
161 | and.l d7, d1 /* (old ^ val) & vb */ |
162 | bne 2f |
163 | move.l d0, d6 /* old = val */ |
164 | bra 0b |
165 | |
166 | 2: /* vcnt jump or vb change */ |
167 | move.l d6, (a2)+ /* *ram++ = old */ |
168 | move.l d0, (a2)+ /* *ram++ = val */ |
169 | move.b d2, d5 /* vcnt_expect = vcnt */ |
170 | move.l d0, d6 /* old = val */ |
171 | bra 0b |
172 | |
173 | 3: /* vcnt == 0 */ |
174 | move.l d0, d1 |
175 | and.l d7, d1 |
176 | bne 1b /* still in VB */ |
177 | |
178 | move.l d0, (a2)+ /* *ram++ = val */ |
179 | move.l d4, (a2)+ /* *ram++ = count */ |
180 | |
181 | movem.l (sp)+, d2-d7/a2 |
182 | rts |
183 | |
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184 | .global test_hint |
185 | test_hint: |
186 | move.w d0, -(sp) /* 8 */ |
187 | move.w (0xc00008).l, d0 /* 16 */ |
188 | addq.w #1, (0xf000).w /* 16 */ |
189 | tst.w (0xf002).w /* 12 */ |
190 | bne 0f /* 10 */ |
191 | move.w d0, (0xf002).w /* 12 */ |
192 | 0: |
193 | move.w d0, (0xf004).w /* 12 */ |
194 | move.w (sp)+, d0 /* 8 */ |
195 | rte /* 20 114 */ |
196 | .global test_hint_end |
197 | test_hint_end: |
198 | |
199 | .global test_vint |
200 | test_vint: |
201 | move.w d0, -(sp) /* 8 */ |
202 | move.w (0xc00008).l, d0 /* 16 */ |
203 | addq.w #1, (0xf008).w /* 16 */ |
204 | tst.w (0xf00a).w /* 12 */ |
205 | bne 0f /* 10 */ |
206 | move.w d0, (0xf00a).w /* 12 */ |
207 | 0: |
208 | move.w d0, (0xf00c).w /* 12 */ |
209 | move.w (sp)+, d0 /* 8 */ |
210 | rte /* 20 114 */ |
211 | .global test_vint_end |
212 | test_vint_end: |
213 | |
214 | |
ffd4b35c |
215 | # vim:filetype=asmM68k:ts=4:sw=4:expandtab |