| cff531af |
1 | /*\r |
| 2 | * PicoDrive\r |
| 3 | * (C) notaz, 2006-2009\r |
| 7bf552b5 |
4 | * (C) irixxxx, 2019,2020\r |
| cff531af |
5 | *\r |
| 6 | * This work is licensed under the terms of MAME license.\r |
| 7 | * See COPYING file in the top-level directory.\r |
| 8 | */\r |
| cc68a136 |
9 | \r |
| 9760505e |
10 | #include "arm_features.h"\r |
| d40a5af4 |
11 | #include "pico_int_offs.h"\r |
| 88fd63ad |
12 | \r |
| 0ace9b9a |
13 | .equ SRR_MAPPED, (1 << 0)\r |
| 14 | .equ SRR_READONLY, (1 << 1)\r |
| 15 | .equ SRF_EEPROM, (1 << 1)\r |
| db1d3564 |
16 | .equ POPT_EN_32X, (1 << 20)\r |
| cc68a136 |
17 | \r |
| 18 | .text\r |
| 3ec29f01 |
19 | .align 4\r |
| cc68a136 |
20 | \r |
| 0ace9b9a |
21 | .global PicoRead8_sram\r |
| 22 | .global PicoRead8_io\r |
| 23 | .global PicoRead16_sram\r |
| 24 | .global PicoRead16_io\r |
| 25 | .global PicoWrite8_io\r |
| 26 | .global PicoWrite16_io\r |
| cc68a136 |
27 | \r |
| 9760505e |
28 | PIC_LDR_INIT()\r |
| 29 | \r |
| 88fd63ad |
30 | PicoRead8_sram: @ u32 a\r |
| 9760505e |
31 | PIC_LDR(r3, r1, Pico)\r |
| 88fd63ad |
32 | ldr r1, [r3, #OFS_Pico_sv_end]\r |
| cc68a136 |
33 | cmp r0, r1\r |
| b4db550e |
34 | bgt m_read8_nosram\r |
| 88fd63ad |
35 | ldr r2, [r3, #OFS_Pico_sv_start]\r |
| 36 | cmp r0, r2\r |
| cc68a136 |
37 | blt m_read8_nosram\r |
| 88fd63ad |
38 | ldrb r1, [r3, #OFS_Pico_m_sram_reg]\r |
| 0ace9b9a |
39 | tst r1, #SRR_MAPPED\r |
| 40 | beq m_read8_nosram\r |
| 88fd63ad |
41 | ldr r1, [r3, #OFS_Pico_sv_flags]\r |
| 0ace9b9a |
42 | tst r1, #SRF_EEPROM\r |
| 43 | bne m_read8_eeprom\r |
| 88fd63ad |
44 | ldr r1, [r3, #OFS_Pico_sv_data]\r |
| 45 | sub r0, r0, r2\r |
| 46 | ldrb r0, [r0, r1]\r |
| 0ace9b9a |
47 | bx lr\r |
| 48 | \r |
| cc68a136 |
49 | m_read8_nosram:\r |
| 88fd63ad |
50 | ldr r1, [r3, #OFS_Pico_romsize]\r |
| cc68a136 |
51 | cmp r0, r1\r |
| 52 | movgt r0, #0\r |
| 53 | bxgt lr @ bad location\r |
| 0ace9b9a |
54 | @ XXX: banking unfriendly\r |
| 88fd63ad |
55 | ldr r1, [r3, #OFS_Pico_rom]\r |
| cc68a136 |
56 | eor r0, r0, #1\r |
| 57 | ldrb r0, [r1, r0]\r |
| 58 | bx lr\r |
| 59 | \r |
| 0ace9b9a |
60 | m_read8_eeprom:\r |
| 61 | stmfd sp!,{r0,lr}\r |
| 62 | bl EEPROM_read\r |
| b4db550e |
63 | ldmfd sp!,{r1,lr}\r |
| 64 | tst r1, #1\r |
| 0ace9b9a |
65 | moveq r0, r0, lsr #8\r |
| 78d817c3 |
66 | and r0, r0, #0xff\r |
| 0ace9b9a |
67 | bx lr\r |
| 29a95187 |
68 | \r |
| 29a95187 |
69 | \r |
| 88fd63ad |
70 | PicoRead8_io: @ u32 a\r |
| 0ace9b9a |
71 | bic r2, r0, #0x001f @ most commonly we get i/o port read,\r |
| 72 | cmp r2, #0xa10000 @ so check for it first\r |
| 531a8f38 |
73 | beq io_ports_read\r |
| e5503e2f |
74 | \r |
| 0ace9b9a |
75 | m_read8_not_io:\r |
| 76 | and r2, r0, #0xfc00\r |
| 77 | cmp r2, #0x1000\r |
| 93f9619e |
78 | bne PicoRead8_32x\r |
| 0ace9b9a |
79 | \r |
| 9760505e |
80 | PIC_LDR(r3, r1, Pico)\r |
| 0ace9b9a |
81 | mov r1, r0\r |
| 88fd63ad |
82 | ldr r0, [r3, #OFS_Pico_m_rotate]\r |
| 0ace9b9a |
83 | add r0, r0, #1\r |
| 88fd63ad |
84 | strb r0, [r3, #OFS_Pico_m_rotate]\r |
| 0ace9b9a |
85 | eor r0, r0, r0, lsl #6\r |
| e5503e2f |
86 | \r |
| cc68a136 |
87 | tst r1, #1\r |
| 0ace9b9a |
88 | bxne lr @ odd addr -> open bus\r |
| 89 | bic r0, r0, #1 @ bit0 defined in this area\r |
| 90 | and r2, r1, #0xff00\r |
| 91 | cmp r2, #0x1100\r |
| 92 | bxne lr @ not busreq\r |
| 93 | \r |
| 88fd63ad |
94 | ldrb r1, [r3, #OFS_Pico_m_z80Run]\r |
| 95 | ldrb r2, [r3, #OFS_Pico_m_z80_reset]\r |
| 0ace9b9a |
96 | orr r0, r0, r1\r |
| 97 | orr r0, r0, r2\r |
| cc68a136 |
98 | bx lr\r |
| 99 | \r |
| cc68a136 |
100 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r |
| 101 | \r |
| 0ace9b9a |
102 | PicoRead16_sram: @ u32 a, u32 d\r |
| 9760505e |
103 | PIC_LDR(r3, r1, Pico)\r |
| 88fd63ad |
104 | ldr r1, [r3, #OFS_Pico_sv_end]\r |
| cc68a136 |
105 | cmp r0, r1\r |
| b4db550e |
106 | bgt m_read16_nosram\r |
| 88fd63ad |
107 | ldr r2, [r3, #OFS_Pico_sv_start]\r |
| 108 | cmp r0, r2\r |
| cc68a136 |
109 | blt m_read16_nosram\r |
| 88fd63ad |
110 | ldrb r1, [r3, #OFS_Pico_m_sram_reg]\r |
| 0ace9b9a |
111 | tst r1, #SRR_MAPPED\r |
| 7969166e |
112 | beq m_read16_nosram\r |
| 88fd63ad |
113 | ldr r1, [r3, #OFS_Pico_sv_flags]\r |
| 0ace9b9a |
114 | tst r1, #SRF_EEPROM\r |
| 115 | bne EEPROM_read\r |
| 88fd63ad |
116 | ldr r1, [r3, #OFS_Pico_sv_data]\r |
| 117 | sub r0, r0, r2\r |
| 118 | ldrb r1, [r0, r1]!\r |
| 119 | ldrb r0, [r0, #1]\r |
| 0ace9b9a |
120 | orr r0, r0, r1, lsl #8\r |
| 121 | bx lr\r |
| 122 | \r |
| cc68a136 |
123 | m_read16_nosram:\r |
| 88fd63ad |
124 | ldr r1, [r3, #OFS_Pico_romsize]\r |
| cc68a136 |
125 | cmp r0, r1\r |
| 126 | movgt r0, #0\r |
| 127 | bxgt lr @ bad location\r |
| 0ace9b9a |
128 | @ XXX: banking unfriendly\r |
| 88fd63ad |
129 | ldr r1, [r3, #OFS_Pico_rom]\r |
| cc68a136 |
130 | ldrh r0, [r1, r0]\r |
| 131 | bx lr\r |
| 132 | \r |
| cc68a136 |
133 | \r |
| 0ace9b9a |
134 | PicoRead16_io: @ u32 a, u32 d\r |
| 135 | bic r2, r0, #0x001f @ most commonly we get i/o port read,\r |
| 136 | cmp r2, #0xa10000 @ so check for it first\r |
| 137 | bne m_read16_not_io\r |
| 1dceadae |
138 | stmfd sp!,{lr}\r |
| 531a8f38 |
139 | bl io_ports_read @ same as read8\r |
| 0ace9b9a |
140 | orr r0, r0, r0, lsl #8 @ only has bytes mirrored\r |
| 1dceadae |
141 | ldmfd sp!,{pc}\r |
| cc68a136 |
142 | \r |
| 0ace9b9a |
143 | m_read16_not_io:\r |
| 144 | and r2, r0, #0xfc00\r |
| 145 | cmp r2, #0x1000\r |
| 93f9619e |
146 | bne PicoRead16_32x\r |
| cc68a136 |
147 | \r |
| 9760505e |
148 | PIC_LDR(r3, r2, Pico)\r |
| 0ace9b9a |
149 | and r2, r0, #0xff00\r |
| 88fd63ad |
150 | ldr r0, [r3, #OFS_Pico_m_rotate]\r |
| 0ace9b9a |
151 | add r0, r0, #1\r |
| 88fd63ad |
152 | strb r0, [r3, #OFS_Pico_m_rotate]\r |
| 0ace9b9a |
153 | eor r0, r0, r0, lsl #5\r |
| 154 | eor r0, r0, r0, lsl #8\r |
| 155 | bic r0, r0, #0x100 @ bit8 defined in this area\r |
| 156 | cmp r2, #0x1100\r |
| 157 | bxne lr @ not busreq\r |
| 158 | \r |
| 88fd63ad |
159 | ldrb r1, [r3, #OFS_Pico_m_z80Run]\r |
| 160 | ldrb r2, [r3, #OFS_Pico_m_z80_reset]\r |
| 0ace9b9a |
161 | orr r0, r0, r1, lsl #8\r |
| 162 | orr r0, r0, r2, lsl #8\r |
| cc68a136 |
163 | bx lr\r |
| 164 | \r |
| e5503e2f |
165 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r |
| 166 | \r |
| 0ace9b9a |
167 | PicoWrite8_io: @ u32 a, u32 d\r |
| 168 | bic r2, r0, #0x1e @ most commonly we get i/o port write,\r |
| 169 | eor r2, r2, #0xa10000 @ so check for it first\r |
| 170 | eors r2, r2, #1\r |
| 531a8f38 |
171 | beq io_ports_write\r |
| e5503e2f |
172 | \r |
| 0ace9b9a |
173 | m_write8_not_io:\r |
| 174 | tst r0, #1\r |
| 175 | bne m_write8_not_z80ctl @ even addrs only\r |
| 176 | and r2, r0, #0xff00\r |
| 177 | cmp r2, #0x1100\r |
| 178 | moveq r0, r1\r |
| 179 | beq ctl_write_z80busreq\r |
| 180 | cmp r2, #0x1200\r |
| 181 | moveq r0, r1\r |
| 182 | beq ctl_write_z80reset\r |
| 183 | \r |
| 184 | m_write8_not_z80ctl:\r |
| 185 | @ unlikely\r |
| 186 | eor r2, r0, #0xa10000\r |
| 187 | eor r2, r2, #0x003000\r |
| 188 | eors r2, r2, #0x0000f1\r |
| 93f9619e |
189 | bne PicoWrite8_32x\r |
| 9760505e |
190 | PIC_LDR(r3, r2, Pico)\r |
| 88fd63ad |
191 | ldrb r2, [r3, #OFS_Pico_m_sram_reg]\r |
| 0ace9b9a |
192 | and r1, r1, #(SRR_MAPPED|SRR_READONLY)\r |
| 193 | bic r2, r2, #(SRR_MAPPED|SRR_READONLY)\r |
| 194 | orr r2, r2, r1\r |
| 88fd63ad |
195 | strb r2, [r3, #OFS_Pico_m_sram_reg]\r |
| e5503e2f |
196 | bx lr\r |
| 197 | \r |
| 0ace9b9a |
198 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r |
| e5503e2f |
199 | \r |
| 0ace9b9a |
200 | PicoWrite16_io: @ u32 a, u32 d\r |
| 201 | bic r2, r0, #0x1f @ most commonly we get i/o port write,\r |
| 202 | cmp r2, #0xa10000 @ so check for it first\r |
| 531a8f38 |
203 | beq io_ports_write\r |
| 0ace9b9a |
204 | \r |
| 205 | m_write16_not_io:\r |
| 206 | and r2, r0, #0xff00\r |
| 207 | cmp r2, #0x1100\r |
| 208 | moveq r0, r1, lsr #8\r |
| 209 | beq ctl_write_z80busreq\r |
| 210 | cmp r2, #0x1200\r |
| 211 | moveq r0, r1, lsr #8\r |
| 212 | beq ctl_write_z80reset\r |
| 213 | \r |
| 214 | m_write16_not_z80ctl:\r |
| 215 | @ unlikely\r |
| 216 | eor r2, r0, #0xa10000\r |
| 217 | eor r2, r2, #0x003000\r |
| 218 | eors r2, r2, #0x0000f0\r |
| 93f9619e |
219 | bne PicoWrite16_32x\r |
| 9760505e |
220 | PIC_LDR(r3, r2, Pico)\r |
| 88fd63ad |
221 | ldrb r2, [r3, #OFS_Pico_m_sram_reg]\r |
| 0ace9b9a |
222 | and r1, r1, #(SRR_MAPPED|SRR_READONLY)\r |
| 223 | bic r2, r2, #(SRR_MAPPED|SRR_READONLY)\r |
| 224 | orr r2, r2, r1\r |
| 88fd63ad |
225 | strb r2, [r3, #OFS_Pico_m_sram_reg]\r |
| 0ace9b9a |
226 | bx lr\r |
| e5503e2f |
227 | \r |
| 78d817c3 |
228 | .global m68k_read8\r |
| 229 | .global m68k_read16\r |
| 82b3e6cf |
230 | .global m68k_read32\r |
| 78d817c3 |
231 | .global m68k_write8\r |
| 232 | .global m68k_write16\r |
| 82b3e6cf |
233 | .global m68k_write32\r |
| 78d817c3 |
234 | \r |
| 235 | m68k_read8:\r |
| 9760505e |
236 | PIC_LDR(r3, r2, m68k_read8_map)\r |
| 78d817c3 |
237 | bic r0, r0, #0xff000000\r |
| 238 | mov r2, r0, lsr #16\r |
| 239 | ldr r3, [r3, r2, lsl #2]\r |
| 240 | eor r2, r0, #1\r |
| 241 | movs r3, r3, lsl #1\r |
| 242 | ldrccb r0, [r3, r2]\r |
| 243 | bxcc lr\r |
| 244 | bx r3\r |
| 245 | \r |
| 246 | m68k_read16:\r |
| 9760505e |
247 | PIC_LDR(r3, r2, m68k_read16_map)\r |
| 78d817c3 |
248 | bic r0, r0, #0xff000000\r |
| 249 | mov r2, r0, lsr #16\r |
| 250 | ldr r3, [r3, r2, lsl #2]\r |
| 251 | bic r0, r0, #1\r |
| 252 | movs r3, r3, lsl #1\r |
| 253 | ldrcch r0, [r3, r0]\r |
| 254 | bxcc lr\r |
| 255 | bx r3\r |
| 256 | \r |
| 257 | m68k_read32:\r |
| 9760505e |
258 | PIC_LDR(r3, r2, m68k_read16_map)\r |
| 78d817c3 |
259 | bic r0, r0, #0xff000000\r |
| 260 | mov r2, r0, lsr #16\r |
| 261 | ldr r3, [r3, r2, lsl #2]\r |
| 262 | bic r0, r0, #1\r |
| 263 | movs r3, r3, lsl #1\r |
| 264 | ldrcch r1, [r3, r0]!\r |
| 265 | ldrcch r0, [r3, #2]\r |
| 266 | orrcc r0, r0, r1, lsl #16\r |
| 267 | bxcc lr\r |
| 268 | \r |
| 269 | stmfd sp!, {r0, r3, r4, lr}\r |
| 270 | mov lr, pc\r |
| 271 | bx r3\r |
| 272 | ldmfd sp!, {r1, r3}\r |
| 273 | str r0, [sp]\r |
| 274 | add r0, r1, #2\r |
| 275 | mov lr, pc\r |
| 276 | bx r3\r |
| 277 | ldmfd sp!, {r1, lr}\r |
| 278 | mov r0, r0, lsl #16\r |
| 279 | mov r1, r1, lsl #16\r |
| 280 | orr r0, r1, r0, lsr #16\r |
| 281 | bx lr\r |
| 282 | \r |
| 283 | m68k_write8:\r |
| 9760505e |
284 | PIC_LDR(r3, r2, m68k_write8_map)\r |
| 78d817c3 |
285 | bic r0, r0, #0xff000000\r |
| 286 | mov r2, r0, lsr #16\r |
| 287 | ldr r3, [r3, r2, lsl #2]\r |
| 288 | eor r2, r0, #1\r |
| 289 | movs r3, r3, lsl #1\r |
| 290 | strccb r1, [r3, r2]\r |
| 291 | bxcc lr\r |
| 292 | bx r3\r |
| 293 | \r |
| 294 | m68k_write16:\r |
| 9760505e |
295 | PIC_LDR(r3, r2, m68k_write16_map)\r |
| 78d817c3 |
296 | bic r0, r0, #0xff000000\r |
| 297 | mov r2, r0, lsr #16\r |
| 298 | ldr r3, [r3, r2, lsl #2]\r |
| 299 | bic r0, r0, #1\r |
| 300 | movs r3, r3, lsl #1\r |
| 301 | strcch r1, [r3, r0]\r |
| 302 | bxcc lr\r |
| 303 | bx r3\r |
| 304 | \r |
| 305 | m68k_write32:\r |
| 9760505e |
306 | PIC_LDR(r3, r2, m68k_write16_map)\r |
| 78d817c3 |
307 | bic r0, r0, #0xff000000\r |
| 308 | mov r2, r0, lsr #16\r |
| 309 | ldr r3, [r3, r2, lsl #2]\r |
| 310 | bic r0, r0, #1\r |
| 311 | movs r3, r3, lsl #1\r |
| 312 | movcc r2, r1, lsr #16\r |
| 313 | strcch r2, [r3, r0]!\r |
| 314 | strcch r1, [r3, #2]\r |
| 315 | bxcc lr\r |
| 316 | \r |
| 317 | stmfd sp!, {r0, r1, r3, lr}\r |
| 318 | mov r1, r1, lsr #16\r |
| 319 | mov lr, pc\r |
| 320 | bx r3\r |
| 321 | ldmfd sp!, {r0, r1, r3, lr}\r |
| 322 | add r0, r0, #2\r |
| 323 | bx r3\r |
| 324 | \r |
| 0ace9b9a |
325 | .pool\r |
| e5503e2f |
326 | \r |
| cff531af |
327 | @ vim:filetype=armasm\r |
notaz.gp2x.de / picodrive.git / blame