[400] | 1 | ; Project name : XTIDE Universal BIOS |
---|
| 2 | ; Description : Memory mapped IDE Device transfer functions. |
---|
| 3 | |
---|
| 4 | ; |
---|
[412] | 5 | ; XTIDE Universal BIOS and Associated Tools |
---|
[400] | 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team. |
---|
| 7 | ; |
---|
| 8 | ; This program is free software; you can redistribute it and/or modify |
---|
| 9 | ; it under the terms of the GNU General Public License as published by |
---|
| 10 | ; the Free Software Foundation; either version 2 of the License, or |
---|
| 11 | ; (at your option) any later version. |
---|
[412] | 12 | ; |
---|
[400] | 13 | ; This program is distributed in the hope that it will be useful, |
---|
| 14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of |
---|
| 15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
---|
[412] | 16 | ; GNU General Public License for more details. |
---|
[400] | 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
---|
[412] | 18 | ; |
---|
[400] | 19 | |
---|
| 20 | ; Structure containing variables for PIO transfer functions. |
---|
| 21 | ; This struct must not be larger than IDEPACK without INTPACK. |
---|
[414] | 22 | struc MEMPIOVARS ; Must not be larger than 9 bytes! See IDEPACK in RamVars.inc. |
---|
| 23 | .wSectorsInBlock resb 2 ; 0-1, Block size in sectors |
---|
| 24 | .fpDPT resb 4 ; 2-5, Far pointer to DPT |
---|
| 25 | .bSectorsLeft resb 1 ; 6, Sectors left to transfer |
---|
[400] | 26 | resb 1 ; 7, IDEPACK.bDeviceControl |
---|
[414] | 27 | .bSectorsDone resb 1 ; 8, Number of sectors xferred |
---|
[400] | 28 | endstruc |
---|
| 29 | |
---|
[473] | 30 | SECTOR_ACCESS_WINDOW_SIZE EQU 512 ; 512 bytes |
---|
[400] | 31 | |
---|
[473] | 32 | |
---|
[400] | 33 | ; Section containing code |
---|
| 34 | SECTION .text |
---|
| 35 | |
---|
| 36 | ;-------------------------------------------------------------------- |
---|
| 37 | ; JrIdeTransfer_StartWithCommandInAL |
---|
| 38 | ; Parameters: |
---|
| 39 | ; AL: IDE command that was used to start the transfer |
---|
| 40 | ; (all PIO read and write commands including Identify Device) |
---|
[474] | 41 | ; ES:SI: Ptr to normalized data buffer |
---|
[400] | 42 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
---|
| 43 | ; SS:BP: Ptr to IDEPACK |
---|
| 44 | ; Returns: |
---|
| 45 | ; AH: INT 13h Error Code |
---|
| 46 | ; CX: Number of successfully transferred sectors |
---|
| 47 | ; CF: Cleared if success, Set if error |
---|
| 48 | ; Corrupts registers: |
---|
| 49 | ; AL, BX, DX, SI, ES |
---|
| 50 | ;-------------------------------------------------------------------- |
---|
| 51 | ALIGN JUMP_ALIGN |
---|
| 52 | JrIdeTransfer_StartWithCommandInAL: |
---|
[473] | 53 | ; Initialize MEMPIOVARS |
---|
| 54 | xchg cx, ax ; IDE command to CL |
---|
| 55 | xor ax, ax |
---|
| 56 | mov [bp+MEMPIOVARS.bSectorsDone], al |
---|
| 57 | mov al, [bp+IDEPACK.bSectorCount] |
---|
| 58 | mov [bp+MEMPIOVARS.bSectorsLeft], al |
---|
| 59 | mov al, [di+DPT_ATA.bBlockSize] |
---|
| 60 | mov [bp+MEMPIOVARS.wSectorsInBlock], ax |
---|
[400] | 61 | mov [bp+MEMPIOVARS.fpDPT], di |
---|
| 62 | mov [bp+MEMPIOVARS.fpDPT+2], ds |
---|
| 63 | |
---|
[473] | 64 | ; Get far pointer to Sector Access Window |
---|
| 65 | mov dx, [di+DPT.wBasePort] |
---|
| 66 | cmp BYTE [di+DPT_ATA.bDevice], DEVICE_8BIT_JRIDE_ISA |
---|
| 67 | jne SHORT .GetSectorAccessWindowForXTCF |
---|
| 68 | |
---|
| 69 | ; Get Sector Access Window for JR-IDE/ISA |
---|
| 70 | mov di, JRIDE_SECTOR_ACCESS_WINDOW_OFFSET |
---|
| 71 | mov ds, dx ; Segment for JR-IDE/ISA |
---|
| 72 | jmp SHORT .SectorAccessWindowLoadedToDSDI |
---|
| 73 | |
---|
| 74 | .GetSectorAccessWindowForXTCF: |
---|
| 75 | xor di, di |
---|
| 76 | add dl, XTCF_CONTROL_REGISTER |
---|
| 77 | in al, dx ; Read high byte for Sector Access Window segment |
---|
| 78 | xchg ah, al |
---|
| 79 | mov ds, ax |
---|
| 80 | |
---|
[400] | 81 | ; Are we reading or writing? |
---|
[473] | 82 | .SectorAccessWindowLoadedToDSDI: |
---|
| 83 | test cl, 16 ; Bit 4 is cleared on all the read commands but set on 3 of the 4 write commands |
---|
[400] | 84 | jnz SHORT WriteToSectorAccessWindow |
---|
[473] | 85 | cmp cl, COMMAND_WRITE_MULTIPLE |
---|
[400] | 86 | je SHORT WriteToSectorAccessWindow |
---|
| 87 | ; Fall to ReadFromSectorAccessWindow |
---|
| 88 | |
---|
| 89 | ;-------------------------------------------------------------------- |
---|
| 90 | ; ReadFromSectorAccessWindow |
---|
| 91 | ; Parameters: |
---|
[473] | 92 | ; DS:DI: Ptr to Sector Access Window |
---|
[400] | 93 | ; ES:SI: Normalized ptr to buffer to receive data |
---|
| 94 | ; SS:BP: Ptr to MEMPIOVARS |
---|
| 95 | ; Returns: |
---|
| 96 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
---|
| 97 | ; AH: BIOS Error code |
---|
| 98 | ; CX: Number of successfully transferred sectors |
---|
| 99 | ; CF: 0 if transfer successful |
---|
| 100 | ; 1 if any error |
---|
| 101 | ; Corrupts registers: |
---|
| 102 | ; AL, BX, DX, SI, ES |
---|
| 103 | ;-------------------------------------------------------------------- |
---|
| 104 | ReadFromSectorAccessWindow: |
---|
[473] | 105 | xchg si, di ; DS:SI = source, ES:DI = Destination |
---|
[400] | 106 | call WaitUntilReadyToTransferNextBlock |
---|
| 107 | jc SHORT ReturnWithMemoryIOtransferErrorInAH |
---|
| 108 | |
---|
| 109 | mov cx, [bp+MEMPIOVARS.wSectorsInBlock] |
---|
[412] | 110 | cmp [bp+MEMPIOVARS.bSectorsLeft], cl |
---|
| 111 | jbe SHORT .ReadLastBlockFromDrive |
---|
[400] | 112 | |
---|
| 113 | ALIGN JUMP_ALIGN |
---|
| 114 | .ReadNextBlockFromDrive: |
---|
| 115 | call ReadSingleBlockFromSectorAccessWindowInDSSItoESDI |
---|
| 116 | call WaitUntilReadyToTransferNextBlock |
---|
| 117 | jc SHORT ReturnWithMemoryIOtransferErrorInAH |
---|
| 118 | |
---|
| 119 | ; Increment number of successfully read sectors |
---|
| 120 | mov cx, [bp+MEMPIOVARS.wSectorsInBlock] |
---|
[412] | 121 | add [bp+MEMPIOVARS.bSectorsDone], cl |
---|
[400] | 122 | sub [bp+MEMPIOVARS.bSectorsLeft], cl |
---|
[412] | 123 | ja SHORT .ReadNextBlockFromDrive |
---|
[400] | 124 | |
---|
| 125 | ALIGN JUMP_ALIGN |
---|
| 126 | .ReadLastBlockFromDrive: |
---|
| 127 | mov cl, [bp+MEMPIOVARS.bSectorsLeft] |
---|
[419] | 128 | push cx |
---|
[400] | 129 | call ReadSingleBlockFromSectorAccessWindowInDSSItoESDI |
---|
| 130 | |
---|
| 131 | ; Check for errors in last block |
---|
| 132 | CheckErrorsAfterTransferringLastMemoryMappedBlock: |
---|
| 133 | lds di, [bp+MEMPIOVARS.fpDPT] ; DPT now in DS:DI |
---|
[417] | 134 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_BSY) |
---|
[400] | 135 | call IdeWait_PollStatusFlagInBLwithTimeoutInBH |
---|
[419] | 136 | pop cx ; [bp+MEMPIOVARS.bSectorsLeft] |
---|
| 137 | jc SHORT ReturnWithMemoryIOtransferErrorInAH |
---|
[400] | 138 | |
---|
[445] | 139 | ; All sectors successfully transferred |
---|
[419] | 140 | add cx, [bp+PIOVARS.bSectorsDone] ; Never sets CF |
---|
| 141 | ret |
---|
| 142 | |
---|
[400] | 143 | ; Return number of successfully transferred sectors |
---|
| 144 | ReturnWithMemoryIOtransferErrorInAH: |
---|
| 145 | lds di, [bp+MEMPIOVARS.fpDPT] ; DPT now in DS:DI |
---|
| 146 | %ifdef USE_386 |
---|
[412] | 147 | movzx cx, [bp+MEMPIOVARS.bSectorsDone] |
---|
[400] | 148 | %else |
---|
| 149 | mov ch, 0 |
---|
| 150 | mov cl, [bp+MEMPIOVARS.bSectorsDone] |
---|
| 151 | %endif |
---|
| 152 | ret |
---|
| 153 | |
---|
| 154 | |
---|
| 155 | ;-------------------------------------------------------------------- |
---|
| 156 | ; WriteToSectorAccessWindow |
---|
| 157 | ; Parameters: |
---|
[473] | 158 | ; DS:DI: Ptr to Sector Access Window |
---|
[400] | 159 | ; ES:SI: Normalized ptr to buffer containing data |
---|
| 160 | ; SS:BP: Ptr to MEMPIOVARS |
---|
| 161 | ; Returns: |
---|
| 162 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
---|
| 163 | ; AH: BIOS Error code |
---|
| 164 | ; CX: Number of successfully transferred sectors |
---|
| 165 | ; CF: 0 if transfer successful |
---|
| 166 | ; 1 if any error |
---|
| 167 | ; Corrupts registers: |
---|
| 168 | ; AL, BX, DX, SI, ES |
---|
| 169 | ;-------------------------------------------------------------------- |
---|
| 170 | ALIGN JUMP_ALIGN |
---|
| 171 | WriteToSectorAccessWindow: |
---|
| 172 | push es |
---|
[473] | 173 | push ds |
---|
| 174 | pop es ; ES:DI = Sector Access Window (destination) |
---|
| 175 | pop ds ; DS:SI = Ptr to source buffer |
---|
[400] | 176 | |
---|
| 177 | ; Always poll when writing first block (IRQs are generated for following blocks) |
---|
| 178 | call WaitUntilReadyToTransferNextBlock |
---|
| 179 | jc SHORT ReturnWithMemoryIOtransferErrorInAH |
---|
| 180 | |
---|
| 181 | mov cx, [bp+MEMPIOVARS.wSectorsInBlock] |
---|
[412] | 182 | cmp [bp+MEMPIOVARS.bSectorsLeft], cl |
---|
| 183 | jbe SHORT .WriteLastBlockToDrive |
---|
[400] | 184 | |
---|
| 185 | ALIGN JUMP_ALIGN |
---|
| 186 | .WriteNextBlockToDrive: |
---|
| 187 | call WriteSingleBlockFromDSSIToSectorAccessWindowInESDI |
---|
| 188 | call WaitUntilReadyToTransferNextBlock |
---|
| 189 | jc SHORT ReturnWithMemoryIOtransferErrorInAH |
---|
| 190 | |
---|
| 191 | ; Increment number of successfully written WORDs |
---|
| 192 | mov cx, [bp+MEMPIOVARS.wSectorsInBlock] |
---|
[412] | 193 | add [bp+MEMPIOVARS.bSectorsDone], cl |
---|
[400] | 194 | sub [bp+MEMPIOVARS.bSectorsLeft], cl |
---|
[412] | 195 | ja SHORT .WriteNextBlockToDrive |
---|
[400] | 196 | |
---|
| 197 | ALIGN JUMP_ALIGN |
---|
| 198 | .WriteLastBlockToDrive: |
---|
| 199 | mov cl, [bp+MEMPIOVARS.bSectorsLeft] |
---|
[419] | 200 | push cx |
---|
[400] | 201 | ePUSH_T bx, CheckErrorsAfterTransferringLastMemoryMappedBlock |
---|
| 202 | ; Fall to WriteSingleBlockFromDSSIToSectorAccessWindowInESDI |
---|
| 203 | |
---|
| 204 | ;-------------------------------------------------------------------- |
---|
| 205 | ; WriteSingleBlockFromDSSIToSectorAccessWindowInESDI |
---|
| 206 | ; Parameters: |
---|
| 207 | ; CX: Number of sectors in block |
---|
| 208 | ; DS:SI: Normalized ptr to source buffer |
---|
| 209 | ; ES:DI: Ptr to Sector Access Window |
---|
| 210 | ; Returns: |
---|
| 211 | ; CX, DX: Zero |
---|
| 212 | ; SI: Updated |
---|
| 213 | ; Corrupts registers: |
---|
| 214 | ; BX |
---|
| 215 | ;-------------------------------------------------------------------- |
---|
| 216 | ALIGN JUMP_ALIGN |
---|
| 217 | WriteSingleBlockFromDSSIToSectorAccessWindowInESDI: |
---|
| 218 | mov bx, di |
---|
| 219 | mov dx, cx |
---|
| 220 | xor cl, cl |
---|
| 221 | ALIGN JUMP_ALIGN |
---|
| 222 | .WriteBlock: |
---|
[473] | 223 | mov ch, SECTOR_ACCESS_WINDOW_SIZE >> 9 |
---|
[400] | 224 | rep movsw |
---|
| 225 | mov di, bx ; Reset for next sector |
---|
| 226 | dec dx |
---|
| 227 | jnz SHORT .WriteBlock |
---|
| 228 | ret |
---|
| 229 | |
---|
| 230 | |
---|
| 231 | ;-------------------------------------------------------------------- |
---|
| 232 | ; ReadSingleBlockFromSectorAccessWindowInDSSItoESDI |
---|
| 233 | ; Parameters: |
---|
| 234 | ; CX Number of sectors in block |
---|
| 235 | ; ES:DI: Normalized ptr to buffer to receive data (destination) |
---|
| 236 | ; DS:SI: Ptr to Sector Access Window (source) |
---|
| 237 | ; Returns: |
---|
| 238 | ; CX, DX: Zero |
---|
| 239 | ; DI: Updated |
---|
| 240 | ; Corrupts registers: |
---|
| 241 | ; BX |
---|
| 242 | ;-------------------------------------------------------------------- |
---|
| 243 | ALIGN JUMP_ALIGN |
---|
| 244 | ReadSingleBlockFromSectorAccessWindowInDSSItoESDI: |
---|
| 245 | mov bx, si |
---|
| 246 | mov dx, cx |
---|
| 247 | xor cl, cl |
---|
| 248 | ALIGN JUMP_ALIGN |
---|
| 249 | .ReadBlock: |
---|
[473] | 250 | mov ch, SECTOR_ACCESS_WINDOW_SIZE >> 9 |
---|
[400] | 251 | rep movsw |
---|
| 252 | mov si, bx ; Reset for next sector |
---|
| 253 | dec dx |
---|
| 254 | jnz SHORT .ReadBlock |
---|
| 255 | ret |
---|
| 256 | |
---|
| 257 | |
---|
| 258 | ;-------------------------------------------------------------------- |
---|
| 259 | ; WaitUntilReadyToTransferNextBlock |
---|
| 260 | ; Parameters: |
---|
| 261 | ; SS:BP: Ptr to MEMPIOVARS |
---|
| 262 | ; Returns: |
---|
| 263 | ; AH: INT 13h Error Code |
---|
| 264 | ; CF: Cleared if success, Set if error |
---|
| 265 | ; Corrupts registers: |
---|
| 266 | ; AL, BX, CX, DX |
---|
| 267 | ;-------------------------------------------------------------------- |
---|
| 268 | ALIGN JUMP_ALIGN |
---|
| 269 | WaitUntilReadyToTransferNextBlock: |
---|
| 270 | push ds |
---|
| 271 | push di |
---|
| 272 | lds di, [bp+MEMPIOVARS.fpDPT] ; DPT now in DS:DI |
---|
| 273 | call IdeWait_IRQorDRQ ; Always polls |
---|
| 274 | pop di |
---|
| 275 | pop ds |
---|
| 276 | ret |
---|
| 277 | |
---|
| 278 | |
---|
[473] | 279 | %if SECTOR_ACCESS_WINDOW_SIZE <> 512 |
---|
| 280 | %error "SECTOR_ACCESS_WINDOW_SIZE is no longer equal to 512. JrIdeTransfer.asm needs changes." |
---|
[400] | 281 | %endif |
---|