| cff531af |
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 |
| cc68a136 |
8 | \r |
| 88fd63ad |
9 | #include "pico_int_o32.h"\r |
| 10 | \r |
| 0ace9b9a |
11 | .equ SRR_MAPPED, (1 << 0)\r |
| 12 | .equ SRR_READONLY, (1 << 1)\r |
| 13 | .equ SRF_EEPROM, (1 << 1)\r |
| db1d3564 |
14 | .equ POPT_EN_32X, (1 << 20)\r |
| cc68a136 |
15 | \r |
| 16 | .text\r |
| 3ec29f01 |
17 | .align 4\r |
| cc68a136 |
18 | \r |
| 0ace9b9a |
19 | .global PicoRead8_sram\r |
| 20 | .global PicoRead8_io\r |
| 21 | .global PicoRead16_sram\r |
| 22 | .global PicoRead16_io\r |
| 23 | .global PicoWrite8_io\r |
| 24 | .global PicoWrite16_io\r |
| cc68a136 |
25 | \r |
| 88fd63ad |
26 | PicoRead8_sram: @ u32 a\r |
| 27 | ldr r3, =Pico\r |
| 28 | ldr r1, [r3, #OFS_Pico_sv_end]\r |
| cc68a136 |
29 | cmp r0, r1\r |
| b4db550e |
30 | bgt m_read8_nosram\r |
| 88fd63ad |
31 | ldr r2, [r3, #OFS_Pico_sv_start]\r |
| 32 | cmp r0, r2\r |
| cc68a136 |
33 | blt m_read8_nosram\r |
| 88fd63ad |
34 | ldrb r1, [r3, #OFS_Pico_m_sram_reg]\r |
| 0ace9b9a |
35 | tst r1, #SRR_MAPPED\r |
| 36 | beq m_read8_nosram\r |
| 88fd63ad |
37 | ldr r1, [r3, #OFS_Pico_sv_flags]\r |
| 0ace9b9a |
38 | tst r1, #SRF_EEPROM\r |
| 39 | bne m_read8_eeprom\r |
| 88fd63ad |
40 | ldr r1, [r3, #OFS_Pico_sv_data]\r |
| 41 | sub r0, r0, r2\r |
| 42 | ldrb r0, [r0, r1]\r |
| 0ace9b9a |
43 | bx lr\r |
| 44 | \r |
| cc68a136 |
45 | m_read8_nosram:\r |
| 88fd63ad |
46 | ldr r1, [r3, #OFS_Pico_romsize]\r |
| cc68a136 |
47 | cmp r0, r1\r |
| 48 | movgt r0, #0\r |
| 49 | bxgt lr @ bad location\r |
| 0ace9b9a |
50 | @ XXX: banking unfriendly\r |
| 88fd63ad |
51 | ldr r1, [r3, #OFS_Pico_rom]\r |
| cc68a136 |
52 | eor r0, r0, #1\r |
| 53 | ldrb r0, [r1, r0]\r |
| 54 | bx lr\r |
| 55 | \r |
| 0ace9b9a |
56 | m_read8_eeprom:\r |
| 57 | stmfd sp!,{r0,lr}\r |
| 58 | bl EEPROM_read\r |
| b4db550e |
59 | ldmfd sp!,{r1,lr}\r |
| 60 | tst r1, #1\r |
| 0ace9b9a |
61 | moveq r0, r0, lsr #8\r |
| 62 | bx lr\r |
| 29a95187 |
63 | \r |
| 29a95187 |
64 | \r |
| 88fd63ad |
65 | PicoRead8_io: @ u32 a\r |
| 0ace9b9a |
66 | bic r2, r0, #0x001f @ most commonly we get i/o port read,\r |
| 67 | cmp r2, #0xa10000 @ so check for it first\r |
| 531a8f38 |
68 | beq io_ports_read\r |
| e5503e2f |
69 | \r |
| 0ace9b9a |
70 | m_read8_not_io:\r |
| 71 | and r2, r0, #0xfc00\r |
| 72 | cmp r2, #0x1000\r |
| 73 | bne m_read8_not_brq\r |
| 74 | \r |
| 88fd63ad |
75 | ldr r3, =Pico\r |
| 0ace9b9a |
76 | mov r1, r0\r |
| 88fd63ad |
77 | ldr r0, [r3, #OFS_Pico_m_rotate]\r |
| 0ace9b9a |
78 | add r0, r0, #1\r |
| 88fd63ad |
79 | strb r0, [r3, #OFS_Pico_m_rotate]\r |
| 0ace9b9a |
80 | eor r0, r0, r0, lsl #6\r |
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81 | \r |
| cc68a136 |
82 | tst r1, #1\r |
| 0ace9b9a |
83 | bxne lr @ odd addr -> open bus\r |
| 84 | bic r0, r0, #1 @ bit0 defined in this area\r |
| 85 | and r2, r1, #0xff00\r |
| 86 | cmp r2, #0x1100\r |
| 87 | bxne lr @ not busreq\r |
| 88 | \r |
| 88fd63ad |
89 | ldrb r1, [r3, #OFS_Pico_m_z80Run]\r |
| 90 | ldrb r2, [r3, #OFS_Pico_m_z80_reset]\r |
| 0ace9b9a |
91 | orr r0, r0, r1\r |
| 92 | orr r0, r0, r2\r |
| cc68a136 |
93 | bx lr\r |
| 94 | \r |
| 0ace9b9a |
95 | m_read8_not_brq:\r |
| 96 | ldr r2, =PicoOpt\r |
| 0ffefdb8 |
97 | ldr r2, [r2]\r |
| db1d3564 |
98 | tst r2, #POPT_EN_32X\r |
| 99 | bne PicoRead8_32x\r |
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100 | mov r0, #0\r |
| cc68a136 |
101 | bx lr\r |
| 102 | \r |
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103 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r |
| 104 | \r |
| 0ace9b9a |
105 | PicoRead16_sram: @ u32 a, u32 d\r |
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106 | ldr r3, =Pico\r |
| 107 | ldr r1, [r3, #OFS_Pico_sv_end]\r |
| cc68a136 |
108 | cmp r0, r1\r |
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109 | bgt m_read16_nosram\r |
| 88fd63ad |
110 | ldr r2, [r3, #OFS_Pico_sv_start]\r |
| 111 | cmp r0, r2\r |
| cc68a136 |
112 | blt m_read16_nosram\r |
| 88fd63ad |
113 | ldrb r1, [r3, #OFS_Pico_m_sram_reg]\r |
| 0ace9b9a |
114 | tst r1, #SRR_MAPPED\r |
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115 | beq m_read16_nosram\r |
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116 | ldr r1, [r3, #OFS_Pico_sv_flags]\r |
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117 | tst r1, #SRF_EEPROM\r |
| 118 | bne EEPROM_read\r |
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119 | ldr r1, [r3, #OFS_Pico_sv_data]\r |
| 120 | sub r0, r0, r2\r |
| 121 | ldrb r1, [r0, r1]!\r |
| 122 | ldrb r0, [r0, #1]\r |
| 0ace9b9a |
123 | orr r0, r0, r1, lsl #8\r |
| 124 | bx lr\r |
| 125 | \r |
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126 | m_read16_nosram:\r |
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127 | ldr r1, [r3, #OFS_Pico_romsize]\r |
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128 | cmp r0, r1\r |
| 129 | movgt r0, #0\r |
| 130 | bxgt lr @ bad location\r |
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131 | @ XXX: banking unfriendly\r |
| 88fd63ad |
132 | ldr r1, [r3, #OFS_Pico_rom]\r |
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133 | ldrh r0, [r1, r0]\r |
| 134 | bx lr\r |
| 135 | \r |
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136 | \r |
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137 | PicoRead16_io: @ u32 a, u32 d\r |
| 138 | bic r2, r0, #0x001f @ most commonly we get i/o port read,\r |
| 139 | cmp r2, #0xa10000 @ so check for it first\r |
| 140 | bne m_read16_not_io\r |
| 1dceadae |
141 | stmfd sp!,{lr}\r |
| 531a8f38 |
142 | bl io_ports_read @ same as read8\r |
| 0ace9b9a |
143 | orr r0, r0, r0, lsl #8 @ only has bytes mirrored\r |
| 1dceadae |
144 | ldmfd sp!,{pc}\r |
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145 | \r |
| 0ace9b9a |
146 | m_read16_not_io:\r |
| 147 | and r2, r0, #0xfc00\r |
| 148 | cmp r2, #0x1000\r |
| 149 | bne m_read16_not_brq\r |
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150 | \r |
| 88fd63ad |
151 | ldr r3, =Pico\r |
| 0ace9b9a |
152 | and r2, r0, #0xff00\r |
| 88fd63ad |
153 | ldr r0, [r3, #OFS_Pico_m_rotate]\r |
| 0ace9b9a |
154 | add r0, r0, #1\r |
| 88fd63ad |
155 | strb r0, [r3, #OFS_Pico_m_rotate]\r |
| 0ace9b9a |
156 | eor r0, r0, r0, lsl #5\r |
| 157 | eor r0, r0, r0, lsl #8\r |
| 158 | bic r0, r0, #0x100 @ bit8 defined in this area\r |
| 159 | cmp r2, #0x1100\r |
| 160 | bxne lr @ not busreq\r |
| 161 | \r |
| 88fd63ad |
162 | ldrb r1, [r3, #OFS_Pico_m_z80Run]\r |
| 163 | ldrb r2, [r3, #OFS_Pico_m_z80_reset]\r |
| 0ace9b9a |
164 | orr r0, r0, r1, lsl #8\r |
| 165 | orr r0, r0, r2, lsl #8\r |
| cc68a136 |
166 | bx lr\r |
| 167 | \r |
| 0ace9b9a |
168 | m_read16_not_brq:\r |
| 169 | ldr r2, =PicoOpt\r |
| 0ffefdb8 |
170 | ldr r2, [r2]\r |
| db1d3564 |
171 | tst r2, #POPT_EN_32X\r |
| 172 | bne PicoRead16_32x\r |
| 0ace9b9a |
173 | mov r0, #0\r |
| cc68a136 |
174 | bx lr\r |
| 721cd396 |
175 | \r |
| e5503e2f |
176 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r |
| 177 | \r |
| 0ace9b9a |
178 | PicoWrite8_io: @ u32 a, u32 d\r |
| 179 | bic r2, r0, #0x1e @ most commonly we get i/o port write,\r |
| 180 | eor r2, r2, #0xa10000 @ so check for it first\r |
| 181 | eors r2, r2, #1\r |
| 531a8f38 |
182 | beq io_ports_write\r |
| e5503e2f |
183 | \r |
| 0ace9b9a |
184 | m_write8_not_io:\r |
| 185 | tst r0, #1\r |
| 186 | bne m_write8_not_z80ctl @ even addrs only\r |
| 187 | and r2, r0, #0xff00\r |
| 188 | cmp r2, #0x1100\r |
| 189 | moveq r0, r1\r |
| 190 | beq ctl_write_z80busreq\r |
| 191 | cmp r2, #0x1200\r |
| 192 | moveq r0, r1\r |
| 193 | beq ctl_write_z80reset\r |
| 194 | \r |
| 195 | m_write8_not_z80ctl:\r |
| 196 | @ unlikely\r |
| 197 | eor r2, r0, #0xa10000\r |
| 198 | eor r2, r2, #0x003000\r |
| 199 | eors r2, r2, #0x0000f1\r |
| 200 | bne m_write8_not_sreg\r |
| 88fd63ad |
201 | ldr r3, =Pico\r |
| 202 | ldrb r2, [r3, #OFS_Pico_m_sram_reg]\r |
| 0ace9b9a |
203 | and r1, r1, #(SRR_MAPPED|SRR_READONLY)\r |
| 204 | bic r2, r2, #(SRR_MAPPED|SRR_READONLY)\r |
| 205 | orr r2, r2, r1\r |
| 88fd63ad |
206 | strb r2, [r3, #OFS_Pico_m_sram_reg]\r |
| e5503e2f |
207 | bx lr\r |
| 208 | \r |
| 0ace9b9a |
209 | m_write8_not_sreg:\r |
| 210 | ldr r2, =PicoOpt\r |
| 211 | ldr r2, [r2]\r |
| db1d3564 |
212 | tst r2, #POPT_EN_32X\r |
| 213 | bne PicoWrite8_32x\r |
| e5503e2f |
214 | bx lr\r |
| 215 | \r |
| 0ace9b9a |
216 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r |
| e5503e2f |
217 | \r |
| 0ace9b9a |
218 | PicoWrite16_io: @ u32 a, u32 d\r |
| 219 | bic r2, r0, #0x1f @ most commonly we get i/o port write,\r |
| 220 | cmp r2, #0xa10000 @ so check for it first\r |
| 531a8f38 |
221 | beq io_ports_write\r |
| 0ace9b9a |
222 | \r |
| 223 | m_write16_not_io:\r |
| 224 | and r2, r0, #0xff00\r |
| 225 | cmp r2, #0x1100\r |
| 226 | moveq r0, r1, lsr #8\r |
| 227 | beq ctl_write_z80busreq\r |
| 228 | cmp r2, #0x1200\r |
| 229 | moveq r0, r1, lsr #8\r |
| 230 | beq ctl_write_z80reset\r |
| 231 | \r |
| 232 | m_write16_not_z80ctl:\r |
| 233 | @ unlikely\r |
| 234 | eor r2, r0, #0xa10000\r |
| 235 | eor r2, r2, #0x003000\r |
| 236 | eors r2, r2, #0x0000f0\r |
| 237 | bne m_write16_not_sreg\r |
| 88fd63ad |
238 | ldr r3, =Pico\r |
| 239 | ldrb r2, [r3, #OFS_Pico_m_sram_reg]\r |
| 0ace9b9a |
240 | and r1, r1, #(SRR_MAPPED|SRR_READONLY)\r |
| 241 | bic r2, r2, #(SRR_MAPPED|SRR_READONLY)\r |
| 242 | orr r2, r2, r1\r |
| 88fd63ad |
243 | strb r2, [r3, #OFS_Pico_m_sram_reg]\r |
| 0ace9b9a |
244 | bx lr\r |
| e5503e2f |
245 | \r |
| 0ace9b9a |
246 | m_write16_not_sreg:\r |
| e5503e2f |
247 | ldr r2, =PicoOpt\r |
| e5503e2f |
248 | ldr r2, [r2]\r |
| db1d3564 |
249 | tst r2, #POPT_EN_32X\r |
| 250 | bne PicoWrite16_32x\r |
| 0ace9b9a |
251 | bx lr\r |
| 252 | \r |
| 253 | .pool\r |
| e5503e2f |
254 | \r |
| cff531af |
255 | @ vim:filetype=armasm\r |
notaz.gp2x.de / picodrive.git / blame