[400] | 1 | ; Project name : XTIDE Universal BIOS |
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| 2 | ; Description : Memory mapped IDE Device transfer functions. |
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| 3 | |
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| 4 | ; |
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[412] | 5 | ; XTIDE Universal BIOS and Associated Tools |
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[526] | 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team. |
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[400] | 7 | ; |
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| 8 | ; This program is free software; you can redistribute it and/or modify |
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| 9 | ; it under the terms of the GNU General Public License as published by |
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| 10 | ; the Free Software Foundation; either version 2 of the License, or |
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| 11 | ; (at your option) any later version. |
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[412] | 12 | ; |
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[400] | 13 | ; This program is distributed in the hope that it will be useful, |
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| 14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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[412] | 16 | ; GNU General Public License for more details. |
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[400] | 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
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[412] | 18 | ; |
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[400] | 19 | |
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| 20 | ; Structure containing variables for PIO transfer functions. |
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| 21 | ; This struct must not be larger than IDEPACK without INTPACK. |
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[414] | 22 | struc MEMPIOVARS ; Must not be larger than 9 bytes! See IDEPACK in RamVars.inc. |
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| 23 | .wSectorsInBlock resb 2 ; 0-1, Block size in sectors |
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| 24 | .fpDPT resb 4 ; 2-5, Far pointer to DPT |
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| 25 | .bSectorsLeft resb 1 ; 6, Sectors left to transfer |
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[400] | 26 | resb 1 ; 7, IDEPACK.bDeviceControl |
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[414] | 27 | .bSectorsDone resb 1 ; 8, Number of sectors xferred |
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[400] | 28 | endstruc |
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| 29 | |
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| 30 | |
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| 31 | ; Section containing code |
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| 32 | SECTION .text |
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| 33 | |
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| 34 | ;-------------------------------------------------------------------- |
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| 35 | ; JrIdeTransfer_StartWithCommandInAL |
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| 36 | ; Parameters: |
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| 37 | ; AL: IDE command that was used to start the transfer |
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| 38 | ; (all PIO read and write commands including Identify Device) |
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[480] | 39 | ; ES:SI: Ptr to data buffer |
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[400] | 40 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 41 | ; SS:BP: Ptr to IDEPACK |
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| 42 | ; Returns: |
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| 43 | ; AH: INT 13h Error Code |
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| 44 | ; CX: Number of successfully transferred sectors |
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| 45 | ; CF: Cleared if success, Set if error |
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| 46 | ; Corrupts registers: |
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| 47 | ; AL, BX, DX, SI, ES |
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| 48 | ;-------------------------------------------------------------------- |
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| 49 | ALIGN JUMP_ALIGN |
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| 50 | JrIdeTransfer_StartWithCommandInAL: |
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[473] | 51 | ; Initialize MEMPIOVARS |
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| 52 | xchg cx, ax ; IDE command to CL |
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| 53 | xor ax, ax |
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| 54 | mov [bp+MEMPIOVARS.bSectorsDone], al |
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[538] | 55 | mov dh, [bp+IDEPACK.bSectorCount] |
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| 56 | mov [bp+MEMPIOVARS.bSectorsLeft], dh |
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[473] | 57 | mov al, [di+DPT_ATA.bBlockSize] |
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| 58 | mov [bp+MEMPIOVARS.wSectorsInBlock], ax |
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[400] | 59 | mov [bp+MEMPIOVARS.fpDPT], di |
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| 60 | mov [bp+MEMPIOVARS.fpDPT+2], ds |
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| 61 | |
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[480] | 62 | ; Normalize pointer |
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| 63 | call IdeTransfer_NormalizePointerInESSI |
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[538] | 64 | %ifdef USE_AT |
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| 65 | jc SHORT ReturnWithMemoryIOtransferErrorInAH |
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| 66 | %endif |
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[480] | 67 | |
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[473] | 68 | ; Get far pointer to Sector Access Window |
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| 69 | cmp BYTE [di+DPT_ATA.bDevice], DEVICE_8BIT_JRIDE_ISA |
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[545] | 70 | mov ds, [di+DPT.wBasePort] ; Segment for JR-IDE/ISA and ADP50L |
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[536] | 71 | mov di, ADP50L_SECTOR_ACCESS_WINDOW_OFFSET |
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[545] | 72 | eCMOVE di, JRIDE_SECTOR_ACCESS_WINDOW_OFFSET |
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[473] | 73 | |
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[400] | 74 | ; Are we reading or writing? |
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[473] | 75 | .SectorAccessWindowLoadedToDSDI: |
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| 76 | test cl, 16 ; Bit 4 is cleared on all the read commands but set on 3 of the 4 write commands |
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[400] | 77 | jnz SHORT WriteToSectorAccessWindow |
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[473] | 78 | cmp cl, COMMAND_WRITE_MULTIPLE |
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[400] | 79 | je SHORT WriteToSectorAccessWindow |
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| 80 | ; Fall to ReadFromSectorAccessWindow |
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| 81 | |
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| 82 | ;-------------------------------------------------------------------- |
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| 83 | ; ReadFromSectorAccessWindow |
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| 84 | ; Parameters: |
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[473] | 85 | ; DS:DI: Ptr to Sector Access Window |
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[400] | 86 | ; ES:SI: Normalized ptr to buffer to receive data |
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| 87 | ; SS:BP: Ptr to MEMPIOVARS |
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| 88 | ; Returns: |
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| 89 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 90 | ; AH: BIOS Error code |
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| 91 | ; CX: Number of successfully transferred sectors |
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| 92 | ; CF: 0 if transfer successful |
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| 93 | ; 1 if any error |
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| 94 | ; Corrupts registers: |
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[475] | 95 | ; AL, BX, DX, SI |
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[400] | 96 | ;-------------------------------------------------------------------- |
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| 97 | ReadFromSectorAccessWindow: |
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[473] | 98 | xchg si, di ; DS:SI = source, ES:DI = Destination |
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[400] | 99 | call WaitUntilReadyToTransferNextBlock |
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| 100 | jc SHORT ReturnWithMemoryIOtransferErrorInAH |
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| 101 | |
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[601] | 102 | mov dx, [bp+MEMPIOVARS.wSectorsInBlock] ; Clears DH |
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| 103 | cmp [bp+MEMPIOVARS.bSectorsLeft], dl |
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[412] | 104 | jbe SHORT .ReadLastBlockFromDrive |
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[400] | 105 | |
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| 106 | ALIGN JUMP_ALIGN |
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| 107 | .ReadNextBlockFromDrive: |
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| 108 | call ReadSingleBlockFromSectorAccessWindowInDSSItoESDI |
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| 109 | call WaitUntilReadyToTransferNextBlock |
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| 110 | jc SHORT ReturnWithMemoryIOtransferErrorInAH |
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| 111 | |
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[476] | 112 | ; Update number of successfully read sectors and sectors left to transfer. |
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| 113 | ; We cannot use SUB instruction as a comparison since it will not |
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| 114 | ; work in this situation: |
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| 115 | ; Before SUB we have 2 full blocks left to transfer. SUB command |
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| 116 | ; then compares 2 full blocks against one full block and updates |
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| 117 | ; sectors left to one full block and jumps to .ReadNextBlockFromDrive, |
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| 118 | ; since we have one full block left to transfer. After it has been |
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| 119 | ; transferred, there will be a wait for next block but DRQ is never |
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| 120 | ; set since all is transferred! Then we get timeout error. |
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[601] | 121 | mov dx, [bp+MEMPIOVARS.wSectorsInBlock] |
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| 122 | sub [bp+MEMPIOVARS.bSectorsLeft], dl |
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| 123 | add [bp+MEMPIOVARS.bSectorsDone], dl |
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| 124 | cmp [bp+MEMPIOVARS.bSectorsLeft], dl |
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[412] | 125 | ja SHORT .ReadNextBlockFromDrive |
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[400] | 126 | |
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| 127 | ALIGN JUMP_ALIGN |
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| 128 | .ReadLastBlockFromDrive: |
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[601] | 129 | mov dl, [bp+MEMPIOVARS.bSectorsLeft] |
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| 130 | push dx |
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[400] | 131 | call ReadSingleBlockFromSectorAccessWindowInDSSItoESDI |
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| 132 | |
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| 133 | ; Check for errors in last block |
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| 134 | CheckErrorsAfterTransferringLastMemoryMappedBlock: |
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| 135 | lds di, [bp+MEMPIOVARS.fpDPT] ; DPT now in DS:DI |
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[417] | 136 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_BSY) |
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[400] | 137 | call IdeWait_PollStatusFlagInBLwithTimeoutInBH |
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[419] | 138 | pop cx ; [bp+MEMPIOVARS.bSectorsLeft] |
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| 139 | jc SHORT ReturnWithMemoryIOtransferErrorInAH |
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[400] | 140 | |
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[445] | 141 | ; All sectors successfully transferred |
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[475] | 142 | add cl, [bp+MEMPIOVARS.bSectorsDone] ; Never sets CF |
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[419] | 143 | ret |
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| 144 | |
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[400] | 145 | ; Return number of successfully transferred sectors |
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| 146 | ReturnWithMemoryIOtransferErrorInAH: |
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| 147 | lds di, [bp+MEMPIOVARS.fpDPT] ; DPT now in DS:DI |
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| 148 | %ifdef USE_386 |
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[592] | 149 | movzx cx, [bp+MEMPIOVARS.bSectorsDone] |
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[400] | 150 | %else |
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[475] | 151 | mov ch, 0 ; Preserve CF |
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[400] | 152 | mov cl, [bp+MEMPIOVARS.bSectorsDone] |
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| 153 | %endif |
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| 154 | ret |
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| 155 | |
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| 156 | |
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| 157 | ;-------------------------------------------------------------------- |
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| 158 | ; WriteToSectorAccessWindow |
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| 159 | ; Parameters: |
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[473] | 160 | ; DS:DI: Ptr to Sector Access Window |
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[400] | 161 | ; ES:SI: Normalized ptr to buffer containing data |
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| 162 | ; SS:BP: Ptr to MEMPIOVARS |
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| 163 | ; Returns: |
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| 164 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 165 | ; AH: BIOS Error code |
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| 166 | ; CX: Number of successfully transferred sectors |
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| 167 | ; CF: 0 if transfer successful |
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| 168 | ; 1 if any error |
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| 169 | ; Corrupts registers: |
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| 170 | ; AL, BX, DX, SI, ES |
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| 171 | ;-------------------------------------------------------------------- |
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| 172 | ALIGN JUMP_ALIGN |
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| 173 | WriteToSectorAccessWindow: |
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| 174 | push es |
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[473] | 175 | push ds |
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| 176 | pop es ; ES:DI = Sector Access Window (destination) |
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| 177 | pop ds ; DS:SI = Ptr to source buffer |
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[400] | 178 | |
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| 179 | ; Always poll when writing first block (IRQs are generated for following blocks) |
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| 180 | call WaitUntilReadyToTransferNextBlock |
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| 181 | jc SHORT ReturnWithMemoryIOtransferErrorInAH |
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| 182 | |
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[601] | 183 | mov dx, [bp+MEMPIOVARS.wSectorsInBlock] |
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| 184 | cmp [bp+MEMPIOVARS.bSectorsLeft], dl |
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[412] | 185 | jbe SHORT .WriteLastBlockToDrive |
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[400] | 186 | |
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| 187 | ALIGN JUMP_ALIGN |
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| 188 | .WriteNextBlockToDrive: |
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| 189 | call WriteSingleBlockFromDSSIToSectorAccessWindowInESDI |
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| 190 | call WaitUntilReadyToTransferNextBlock |
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| 191 | jc SHORT ReturnWithMemoryIOtransferErrorInAH |
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| 192 | |
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| 193 | ; Increment number of successfully written WORDs |
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[601] | 194 | mov dx, [bp+MEMPIOVARS.wSectorsInBlock] |
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| 195 | sub [bp+MEMPIOVARS.bSectorsLeft], dl |
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| 196 | add [bp+MEMPIOVARS.bSectorsDone], dl |
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| 197 | cmp [bp+MEMPIOVARS.bSectorsLeft], dl |
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[412] | 198 | ja SHORT .WriteNextBlockToDrive |
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[400] | 199 | |
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| 200 | ALIGN JUMP_ALIGN |
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| 201 | .WriteLastBlockToDrive: |
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[601] | 202 | mov dl, [bp+MEMPIOVARS.bSectorsLeft] |
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| 203 | push dx |
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[400] | 204 | ePUSH_T bx, CheckErrorsAfterTransferringLastMemoryMappedBlock |
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| 205 | ; Fall to WriteSingleBlockFromDSSIToSectorAccessWindowInESDI |
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| 206 | |
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| 207 | ;-------------------------------------------------------------------- |
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| 208 | ; WriteSingleBlockFromDSSIToSectorAccessWindowInESDI |
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| 209 | ; Parameters: |
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[601] | 210 | ; DX: Number of sectors in block |
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[400] | 211 | ; DS:SI: Normalized ptr to source buffer |
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| 212 | ; ES:DI: Ptr to Sector Access Window |
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| 213 | ; Returns: |
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| 214 | ; CX, DX: Zero |
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| 215 | ; SI: Updated |
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| 216 | ; Corrupts registers: |
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| 217 | ; BX |
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| 218 | ;-------------------------------------------------------------------- |
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| 219 | ALIGN JUMP_ALIGN |
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| 220 | WriteSingleBlockFromDSSIToSectorAccessWindowInESDI: |
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| 221 | mov bx, di |
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[536] | 222 | xor cx, cx |
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[400] | 223 | ALIGN JUMP_ALIGN |
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[475] | 224 | .WriteNextSector: |
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[536] | 225 | inc ch |
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[400] | 226 | rep movsw |
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| 227 | mov di, bx ; Reset for next sector |
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| 228 | dec dx |
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[475] | 229 | jnz SHORT .WriteNextSector |
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[400] | 230 | ret |
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| 231 | |
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| 232 | |
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| 233 | ;-------------------------------------------------------------------- |
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| 234 | ; ReadSingleBlockFromSectorAccessWindowInDSSItoESDI |
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| 235 | ; Parameters: |
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[601] | 236 | ; DX: Number of sectors in block |
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| 237 | ; ES:DI: Normalized ptr to destination buffer |
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| 238 | ; DS:SI: Ptr to Sector Access Window |
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[400] | 239 | ; Returns: |
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| 240 | ; CX, DX: Zero |
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| 241 | ; DI: Updated |
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| 242 | ; Corrupts registers: |
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| 243 | ; BX |
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| 244 | ;-------------------------------------------------------------------- |
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| 245 | ALIGN JUMP_ALIGN |
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| 246 | ReadSingleBlockFromSectorAccessWindowInDSSItoESDI: |
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| 247 | mov bx, si |
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[536] | 248 | xor cx, cx |
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[400] | 249 | ALIGN JUMP_ALIGN |
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[475] | 250 | .ReadNextSector: |
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[536] | 251 | inc ch |
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[400] | 252 | rep movsw |
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| 253 | mov si, bx ; Reset for next sector |
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| 254 | dec dx |
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[475] | 255 | jnz SHORT .ReadNextSector |
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[400] | 256 | ret |
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| 257 | |
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| 258 | |
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| 259 | ;-------------------------------------------------------------------- |
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| 260 | ; WaitUntilReadyToTransferNextBlock |
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| 261 | ; Parameters: |
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| 262 | ; SS:BP: Ptr to MEMPIOVARS |
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| 263 | ; Returns: |
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| 264 | ; AH: INT 13h Error Code |
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| 265 | ; CF: Cleared if success, Set if error |
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| 266 | ; Corrupts registers: |
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| 267 | ; AL, BX, CX, DX |
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| 268 | ;-------------------------------------------------------------------- |
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| 269 | ALIGN JUMP_ALIGN |
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| 270 | WaitUntilReadyToTransferNextBlock: |
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| 271 | push ds |
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| 272 | push di |
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| 273 | lds di, [bp+MEMPIOVARS.fpDPT] ; DPT now in DS:DI |
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| 274 | call IdeWait_IRQorDRQ ; Always polls |
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| 275 | pop di |
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| 276 | pop ds |
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| 277 | ret |
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| 278 | |
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