| | 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 |
| | 8 | \r |
| | 9 | #include "pico_int_o32.h"\r |
| | 10 | \r |
| | 11 | .equ SRR_MAPPED, (1 << 0)\r |
| | 12 | .equ SRR_READONLY, (1 << 1)\r |
| | 13 | .equ SRF_EEPROM, (1 << 1)\r |
| | 14 | .equ POPT_EN_32X, (1 << 20)\r |
| | 15 | \r |
| | 16 | .text\r |
| | 17 | .align 4\r |
| | 18 | \r |
| | 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 |
| | 25 | \r |
| | 26 | PicoRead8_sram: @ u32 a\r |
| | 27 | ldr r3, =Pico\r |
| | 28 | ldr r1, [r3, #OFS_Pico_sv_end]\r |
| | 29 | cmp r0, r1\r |
| | 30 | bgt m_read8_nosram\r |
| | 31 | ldr r2, [r3, #OFS_Pico_sv_start]\r |
| | 32 | cmp r0, r2\r |
| | 33 | blt m_read8_nosram\r |
| | 34 | ldrb r1, [r3, #OFS_Pico_m_sram_reg]\r |
| | 35 | tst r1, #SRR_MAPPED\r |
| | 36 | beq m_read8_nosram\r |
| | 37 | ldr r1, [r3, #OFS_Pico_sv_flags]\r |
| | 38 | tst r1, #SRF_EEPROM\r |
| | 39 | bne m_read8_eeprom\r |
| | 40 | ldr r1, [r3, #OFS_Pico_sv_data]\r |
| | 41 | sub r0, r0, r2\r |
| | 42 | ldrb r0, [r0, r1]\r |
| | 43 | bx lr\r |
| | 44 | \r |
| | 45 | m_read8_nosram:\r |
| | 46 | ldr r1, [r3, #OFS_Pico_romsize]\r |
| | 47 | cmp r0, r1\r |
| | 48 | movgt r0, #0\r |
| | 49 | bxgt lr @ bad location\r |
| | 50 | @ XXX: banking unfriendly\r |
| | 51 | ldr r1, [r3, #OFS_Pico_rom]\r |
| | 52 | eor r0, r0, #1\r |
| | 53 | ldrb r0, [r1, r0]\r |
| | 54 | bx lr\r |
| | 55 | \r |
| | 56 | m_read8_eeprom:\r |
| | 57 | stmfd sp!,{r0,lr}\r |
| | 58 | bl EEPROM_read\r |
| | 59 | ldmfd sp!,{r1,lr}\r |
| | 60 | tst r1, #1\r |
| | 61 | moveq r0, r0, lsr #8\r |
| | 62 | bx lr\r |
| | 63 | \r |
| | 64 | \r |
| | 65 | PicoRead8_io: @ u32 a\r |
| | 66 | bic r2, r0, #0x001f @ most commonly we get i/o port read,\r |
| | 67 | cmp r2, #0xa10000 @ so check for it first\r |
| | 68 | beq io_ports_read\r |
| | 69 | \r |
| | 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 |
| | 75 | ldr r3, =Pico\r |
| | 76 | mov r1, r0\r |
| | 77 | ldr r0, [r3, #OFS_Pico_m_rotate]\r |
| | 78 | add r0, r0, #1\r |
| | 79 | strb r0, [r3, #OFS_Pico_m_rotate]\r |
| | 80 | eor r0, r0, r0, lsl #6\r |
| | 81 | \r |
| | 82 | tst r1, #1\r |
| | 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 |
| | 89 | ldrb r1, [r3, #OFS_Pico_m_z80Run]\r |
| | 90 | ldrb r2, [r3, #OFS_Pico_m_z80_reset]\r |
| | 91 | orr r0, r0, r1\r |
| | 92 | orr r0, r0, r2\r |
| | 93 | bx lr\r |
| | 94 | \r |
| | 95 | m_read8_not_brq:\r |
| | 96 | ldr r2, =PicoOpt\r |
| | 97 | ldr r2, [r2]\r |
| | 98 | tst r2, #POPT_EN_32X\r |
| | 99 | bne PicoRead8_32x\r |
| | 100 | mov r0, #0\r |
| | 101 | bx lr\r |
| | 102 | \r |
| | 103 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r |
| | 104 | \r |
| | 105 | PicoRead16_sram: @ u32 a, u32 d\r |
| | 106 | ldr r3, =Pico\r |
| | 107 | ldr r1, [r3, #OFS_Pico_sv_end]\r |
| | 108 | cmp r0, r1\r |
| | 109 | bgt m_read16_nosram\r |
| | 110 | ldr r2, [r3, #OFS_Pico_sv_start]\r |
| | 111 | cmp r0, r2\r |
| | 112 | blt m_read16_nosram\r |
| | 113 | ldrb r1, [r3, #OFS_Pico_m_sram_reg]\r |
| | 114 | tst r1, #SRR_MAPPED\r |
| | 115 | beq m_read16_nosram\r |
| | 116 | ldr r1, [r3, #OFS_Pico_sv_flags]\r |
| | 117 | tst r1, #SRF_EEPROM\r |
| | 118 | bne EEPROM_read\r |
| | 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 |
| | 123 | orr r0, r0, r1, lsl #8\r |
| | 124 | bx lr\r |
| | 125 | \r |
| | 126 | m_read16_nosram:\r |
| | 127 | ldr r1, [r3, #OFS_Pico_romsize]\r |
| | 128 | cmp r0, r1\r |
| | 129 | movgt r0, #0\r |
| | 130 | bxgt lr @ bad location\r |
| | 131 | @ XXX: banking unfriendly\r |
| | 132 | ldr r1, [r3, #OFS_Pico_rom]\r |
| | 133 | ldrh r0, [r1, r0]\r |
| | 134 | bx lr\r |
| | 135 | \r |
| | 136 | \r |
| | 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 |
| | 141 | stmfd sp!,{lr}\r |
| | 142 | bl io_ports_read @ same as read8\r |
| | 143 | orr r0, r0, r0, lsl #8 @ only has bytes mirrored\r |
| | 144 | ldmfd sp!,{pc}\r |
| | 145 | \r |
| | 146 | m_read16_not_io:\r |
| | 147 | and r2, r0, #0xfc00\r |
| | 148 | cmp r2, #0x1000\r |
| | 149 | bne m_read16_not_brq\r |
| | 150 | \r |
| | 151 | ldr r3, =Pico\r |
| | 152 | and r2, r0, #0xff00\r |
| | 153 | ldr r0, [r3, #OFS_Pico_m_rotate]\r |
| | 154 | add r0, r0, #1\r |
| | 155 | strb r0, [r3, #OFS_Pico_m_rotate]\r |
| | 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 |
| | 162 | ldrb r1, [r3, #OFS_Pico_m_z80Run]\r |
| | 163 | ldrb r2, [r3, #OFS_Pico_m_z80_reset]\r |
| | 164 | orr r0, r0, r1, lsl #8\r |
| | 165 | orr r0, r0, r2, lsl #8\r |
| | 166 | bx lr\r |
| | 167 | \r |
| | 168 | m_read16_not_brq:\r |
| | 169 | ldr r2, =PicoOpt\r |
| | 170 | ldr r2, [r2]\r |
| | 171 | tst r2, #POPT_EN_32X\r |
| | 172 | bne PicoRead16_32x\r |
| | 173 | mov r0, #0\r |
| | 174 | bx lr\r |
| | 175 | \r |
| | 176 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r |
| | 177 | \r |
| | 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 |
| | 182 | beq io_ports_write\r |
| | 183 | \r |
| | 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 |
| | 201 | ldr r3, =Pico\r |
| | 202 | ldrb r2, [r3, #OFS_Pico_m_sram_reg]\r |
| | 203 | and r1, r1, #(SRR_MAPPED|SRR_READONLY)\r |
| | 204 | bic r2, r2, #(SRR_MAPPED|SRR_READONLY)\r |
| | 205 | orr r2, r2, r1\r |
| | 206 | strb r2, [r3, #OFS_Pico_m_sram_reg]\r |
| | 207 | bx lr\r |
| | 208 | \r |
| | 209 | m_write8_not_sreg:\r |
| | 210 | ldr r2, =PicoOpt\r |
| | 211 | ldr r2, [r2]\r |
| | 212 | tst r2, #POPT_EN_32X\r |
| | 213 | bne PicoWrite8_32x\r |
| | 214 | bx lr\r |
| | 215 | \r |
| | 216 | @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\r |
| | 217 | \r |
| | 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 |
| | 221 | beq io_ports_write\r |
| | 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 |
| | 238 | ldr r3, =Pico\r |
| | 239 | ldrb r2, [r3, #OFS_Pico_m_sram_reg]\r |
| | 240 | and r1, r1, #(SRR_MAPPED|SRR_READONLY)\r |
| | 241 | bic r2, r2, #(SRR_MAPPED|SRR_READONLY)\r |
| | 242 | orr r2, r2, r1\r |
| | 243 | strb r2, [r3, #OFS_Pico_m_sram_reg]\r |
| | 244 | bx lr\r |
| | 245 | \r |
| | 246 | m_write16_not_sreg:\r |
| | 247 | ldr r2, =PicoOpt\r |
| | 248 | ldr r2, [r2]\r |
| | 249 | tst r2, #POPT_EN_32X\r |
| | 250 | bne PicoWrite16_32x\r |
| | 251 | bx lr\r |
| | 252 | \r |
| | 253 | .pool\r |
| | 254 | \r |
| | 255 | @ vim:filetype=armasm\r |
notaz.gp2x.de / picodrive.git / blame_incremental