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1 | /*\r |
2 | * PicoDrive\r |
3 | * (C) notaz, 2006-2009\r |
4 | *\r |
5 | * This work is licensed under the terms of MAME license.\r |
6 | * See COPYING file in the top-level directory.\r |
7 | */\r |
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8 | \r |
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9 | .equ SRR_MAPPED, (1 << 0)\r |
10 | .equ SRR_READONLY, (1 << 1)\r |
11 | .equ SRF_EEPROM, (1 << 1)\r |
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12 | .equ POPT_EN_32X, (1 << 20)\r |
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13 | \r |
14 | .text\r |
3ec29f01 |
15 | .align 4\r |
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16 | \r |
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17 | .global PicoRead8_sram\r |
18 | .global PicoRead8_io\r |
19 | .global PicoRead16_sram\r |
20 | .global PicoRead16_io\r |
21 | .global PicoWrite8_io\r |
22 | .global PicoWrite16_io\r |
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23 | \r |
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24 | PicoRead8_sram: @ u32 a, u32 d\r |
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25 | ldr r2, =(SRam)\r |
26 | ldr r3, =(Pico+0x22200)\r |
27 | ldr r1, [r2, #8] @ SRam.end\r |
cc68a136 |
28 | cmp r0, r1\r |
b4db550e |
29 | bgt m_read8_nosram\r |
7969166e |
30 | ldr r1, [r2, #4] @ SRam.start\r |
cc68a136 |
31 | cmp r0, r1\r |
32 | blt m_read8_nosram\r |
7969166e |
33 | ldrb r1, [r3, #0x11] @ Pico.m.sram_reg\r |
0ace9b9a |
34 | tst r1, #SRR_MAPPED\r |
35 | beq m_read8_nosram\r |
36 | ldr r1, [r2, #0x0c]\r |
37 | tst r1, #SRF_EEPROM\r |
38 | bne m_read8_eeprom\r |
39 | ldr r1, [r2, #4] @ SRam.start\r |
40 | ldr r2, [r2] @ SRam.data\r |
41 | sub r0, r0, r1\r |
42 | add r0, r0, r2\r |
43 | ldrb r0, [r0]\r |
44 | bx lr\r |
45 | \r |
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46 | m_read8_nosram:\r |
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47 | ldr r1, [r3, #4] @ romsize\r |
cc68a136 |
48 | cmp r0, r1\r |
49 | movgt r0, #0\r |
50 | bxgt lr @ bad location\r |
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51 | @ XXX: banking unfriendly\r |
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52 | ldr r1, [r3]\r |
53 | eor r0, r0, #1\r |
54 | ldrb r0, [r1, r0]\r |
55 | bx lr\r |
56 | \r |
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57 | m_read8_eeprom:\r |
58 | stmfd sp!,{r0,lr}\r |
59 | bl EEPROM_read\r |
b4db550e |
60 | ldmfd sp!,{r1,lr}\r |
61 | tst r1, #1\r |
0ace9b9a |
62 | moveq r0, r0, lsr #8\r |
63 | bx lr\r |
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64 | \r |
29a95187 |
65 | \r |
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66 | PicoRead8_io: @ u32 a, u32 d\r |
67 | bic r2, r0, #0x001f @ most commonly we get i/o port read,\r |
68 | cmp r2, #0xa10000 @ so check for it first\r |
531a8f38 |
69 | beq io_ports_read\r |
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70 | \r |
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71 | m_read8_not_io:\r |
72 | and r2, r0, #0xfc00\r |
73 | cmp r2, #0x1000\r |
74 | bne m_read8_not_brq\r |
75 | \r |
e5503e2f |
76 | ldr r3, =(Pico+0x22200)\r |
0ace9b9a |
77 | mov r1, r0\r |
78 | ldr r0, [r3, #8] @ Pico.m.rotate\r |
79 | add r0, r0, #1\r |
80 | strb r0, [r3, #8]\r |
81 | eor r0, r0, r0, lsl #6\r |
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82 | \r |
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83 | tst r1, #1\r |
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84 | bxne lr @ odd addr -> open bus\r |
85 | bic r0, r0, #1 @ bit0 defined in this area\r |
86 | and r2, r1, #0xff00\r |
87 | cmp r2, #0x1100\r |
88 | bxne lr @ not busreq\r |
89 | \r |
90 | ldrb r1, [r3, #(8+0x01)] @ Pico.m.z80Run\r |
91 | ldrb r2, [r3, #(8+0x0f)] @ Pico.m.z80_reset\r |
92 | orr r0, r0, r1\r |
93 | orr r0, r0, r2\r |
cc68a136 |
94 | bx lr\r |
95 | \r |
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96 | m_read8_not_brq:\r |
97 | ldr r2, =PicoOpt\r |
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98 | ldr r2, [r2]\r |
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99 | tst r2, #POPT_EN_32X\r |
100 | bne PicoRead8_32x\r |
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101 | mov r0, #0\r |
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102 | bx lr\r |
103 | \r |
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104 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r |
105 | \r |
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106 | PicoRead16_sram: @ u32 a, u32 d\r |
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107 | ldr r2, =(SRam)\r |
108 | ldr r3, =(Pico+0x22200)\r |
109 | ldr r1, [r2, #8] @ SRam.end\r |
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110 | cmp r0, r1\r |
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111 | bgt m_read16_nosram\r |
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112 | ldr r1, [r2, #4] @ SRam.start\r |
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113 | cmp r0, r1\r |
114 | blt m_read16_nosram\r |
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115 | ldrb r1, [r3, #0x11] @ Pico.m.sram_reg\r |
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116 | tst r1, #SRR_MAPPED\r |
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117 | beq m_read16_nosram\r |
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118 | ldr r1, [r2, #0x0c]\r |
119 | tst r1, #SRF_EEPROM\r |
120 | bne EEPROM_read\r |
121 | ldr r1, [r2, #4] @ SRam.start\r |
122 | ldr r2, [r2] @ SRam.data\r |
123 | sub r0, r0, r1\r |
124 | add r0, r0, r2\r |
125 | ldrb r1, [r0], #1\r |
126 | ldrb r0, [r0]\r |
127 | orr r0, r0, r1, lsl #8\r |
128 | bx lr\r |
129 | \r |
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130 | m_read16_nosram:\r |
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131 | ldr r1, [r3, #4] @ romsize\r |
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132 | cmp r0, r1\r |
133 | movgt r0, #0\r |
134 | bxgt lr @ bad location\r |
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135 | @ XXX: banking unfriendly\r |
136 | ldr r1, [r3]\r |
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137 | ldrh r0, [r1, r0]\r |
138 | bx lr\r |
139 | \r |
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140 | \r |
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141 | PicoRead16_io: @ u32 a, u32 d\r |
142 | bic r2, r0, #0x001f @ most commonly we get i/o port read,\r |
143 | cmp r2, #0xa10000 @ so check for it first\r |
144 | bne m_read16_not_io\r |
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145 | stmfd sp!,{lr}\r |
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146 | bl io_ports_read @ same as read8\r |
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147 | orr r0, r0, r0, lsl #8 @ only has bytes mirrored\r |
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148 | ldmfd sp!,{pc}\r |
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149 | \r |
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150 | m_read16_not_io:\r |
151 | and r2, r0, #0xfc00\r |
152 | cmp r2, #0x1000\r |
153 | bne m_read16_not_brq\r |
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154 | \r |
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155 | ldr r3, =(Pico+0x22200)\r |
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156 | and r2, r0, #0xff00\r |
157 | ldr r0, [r3, #8] @ Pico.m.rotate\r |
158 | add r0, r0, #1\r |
159 | strb r0, [r3, #8]\r |
160 | eor r0, r0, r0, lsl #5\r |
161 | eor r0, r0, r0, lsl #8\r |
162 | bic r0, r0, #0x100 @ bit8 defined in this area\r |
163 | cmp r2, #0x1100\r |
164 | bxne lr @ not busreq\r |
165 | \r |
166 | ldrb r1, [r3, #(8+0x01)] @ Pico.m.z80Run\r |
167 | ldrb r2, [r3, #(8+0x0f)] @ Pico.m.z80_reset\r |
168 | orr r0, r0, r1, lsl #8\r |
169 | orr r0, r0, r2, lsl #8\r |
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170 | bx lr\r |
171 | \r |
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172 | m_read16_not_brq:\r |
173 | ldr r2, =PicoOpt\r |
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174 | ldr r2, [r2]\r |
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175 | tst r2, #POPT_EN_32X\r |
176 | bne PicoRead16_32x\r |
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177 | mov r0, #0\r |
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178 | bx lr\r |
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179 | \r |
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180 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r |
181 | \r |
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182 | PicoWrite8_io: @ u32 a, u32 d\r |
183 | bic r2, r0, #0x1e @ most commonly we get i/o port write,\r |
184 | eor r2, r2, #0xa10000 @ so check for it first\r |
185 | eors r2, r2, #1\r |
531a8f38 |
186 | beq io_ports_write\r |
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187 | \r |
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188 | m_write8_not_io:\r |
189 | tst r0, #1\r |
190 | bne m_write8_not_z80ctl @ even addrs only\r |
191 | and r2, r0, #0xff00\r |
192 | cmp r2, #0x1100\r |
193 | moveq r0, r1\r |
194 | beq ctl_write_z80busreq\r |
195 | cmp r2, #0x1200\r |
196 | moveq r0, r1\r |
197 | beq ctl_write_z80reset\r |
198 | \r |
199 | m_write8_not_z80ctl:\r |
200 | @ unlikely\r |
201 | eor r2, r0, #0xa10000\r |
202 | eor r2, r2, #0x003000\r |
203 | eors r2, r2, #0x0000f1\r |
204 | bne m_write8_not_sreg\r |
205 | ldr r3, =(Pico+0x22200)\r |
206 | ldrb r2, [r3, #(8+9)] @ Pico.m.sram_reg\r |
207 | and r1, r1, #(SRR_MAPPED|SRR_READONLY)\r |
208 | bic r2, r2, #(SRR_MAPPED|SRR_READONLY)\r |
209 | orr r2, r2, r1\r |
210 | strb r2, [r3, #(8+9)]\r |
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211 | bx lr\r |
212 | \r |
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213 | m_write8_not_sreg:\r |
214 | ldr r2, =PicoOpt\r |
215 | ldr r2, [r2]\r |
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216 | tst r2, #POPT_EN_32X\r |
217 | bne PicoWrite8_32x\r |
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218 | bx lr\r |
219 | \r |
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220 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r |
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221 | \r |
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222 | PicoWrite16_io: @ u32 a, u32 d\r |
223 | bic r2, r0, #0x1f @ most commonly we get i/o port write,\r |
224 | cmp r2, #0xa10000 @ so check for it first\r |
531a8f38 |
225 | beq io_ports_write\r |
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226 | \r |
227 | m_write16_not_io:\r |
228 | and r2, r0, #0xff00\r |
229 | cmp r2, #0x1100\r |
230 | moveq r0, r1, lsr #8\r |
231 | beq ctl_write_z80busreq\r |
232 | cmp r2, #0x1200\r |
233 | moveq r0, r1, lsr #8\r |
234 | beq ctl_write_z80reset\r |
235 | \r |
236 | m_write16_not_z80ctl:\r |
237 | @ unlikely\r |
238 | eor r2, r0, #0xa10000\r |
239 | eor r2, r2, #0x003000\r |
240 | eors r2, r2, #0x0000f0\r |
241 | bne m_write16_not_sreg\r |
242 | ldr r3, =(Pico+0x22200)\r |
243 | ldrb r2, [r3, #(8+9)] @ Pico.m.sram_reg\r |
244 | and r1, r1, #(SRR_MAPPED|SRR_READONLY)\r |
245 | bic r2, r2, #(SRR_MAPPED|SRR_READONLY)\r |
246 | orr r2, r2, r1\r |
247 | strb r2, [r3, #(8+9)]\r |
248 | bx lr\r |
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249 | \r |
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250 | m_write16_not_sreg:\r |
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251 | ldr r2, =PicoOpt\r |
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252 | ldr r2, [r2]\r |
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253 | tst r2, #POPT_EN_32X\r |
254 | bne PicoWrite16_32x\r |
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255 | bx lr\r |
256 | \r |
257 | .pool\r |
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258 | \r |
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259 | @ vim:filetype=armasm\r |