| 1 | ; Project name : XTIDE Universal BIOS
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| 2 | ; Description : IDE Device transfer functions.
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| 3 |
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| 4 | ;
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| 5 | ; XTIDE Universal BIOS and Associated Tools
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| 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team.
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| 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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| 12 | ;
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| 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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| 16 | ; GNU General Public License for more details.
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| 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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| 18 | ;
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| 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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| 22 | struc PIOVARS ; Must not be larger than 9 bytes! See IDEPACK in RamVars.inc.
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| 23 | .wDataPort resb 2 ; 0-1, IDE Data Port
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| 24 | .fnXfer resb 2 ; 2-3, Offset to transfer function
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| 25 | .wSectorsInBlock resb 2 ; 4-5, Block size in sectors
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| 26 | .bSectorsLeft resb 1 ; 6, Sectors left to transfer
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| 27 | resb 1 ; 7, IDEPACK.bDeviceControl
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| 28 | .bSectorsDone resb 1 ; 8, Number of sectors xferred
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| 29 | endstruc
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| 30 |
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| 31 |
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| 32 | ; Section containing code
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| 33 | SECTION .text
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| 34 |
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| 35 | ;--------------------------------------------------------------------
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| 36 | ; IdeTransfer_StartWithCommandInAL
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| 37 | ; Parameters:
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| 38 | ; AL: IDE command that was used to start the transfer
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| 39 | ; (all PIO read and write commands including Identify Device)
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| 40 | ; ES:SI: Ptr to data buffer
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| 41 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 42 | ; SS:BP: Ptr to IDEPACK
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| 43 | ; Returns:
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| 44 | ; AH: INT 13h Error Code
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| 45 | ; CX: Number of successfully transferred sectors
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| 46 | ; CF: Cleared if success, Set if error
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| 47 | ; Corrupts registers:
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| 48 | ; AL, BX, DX, SI, ES
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| 49 | ;--------------------------------------------------------------------
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| 50 | ALIGN JUMP_ALIGN
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| 51 | IdeTransfer_StartWithCommandInAL:
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| 52 | ; Are we reading or writing?
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| 53 | test al, 16 ; Bit 4 is cleared on all the read commands but set on 3 of the 4 write commands
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| 54 | mov ah, [bp+IDEPACK.bSectorCount]
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| 55 | jnz SHORT WriteToDrive
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| 56 | cmp al, COMMAND_WRITE_MULTIPLE
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| 57 | je SHORT WriteToDrive
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| 58 | ; Fall to ReadFromDrive
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| 59 |
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| 60 | ;--------------------------------------------------------------------
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| 61 | ; ReadFromDrive
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| 62 | ; Parameters:
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| 63 | ; AH: Number of sectors to transfer (1...128)
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| 64 | ; ES:SI: Ptr to buffer to receive data
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| 65 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 66 | ; SS:BP: Ptr to PIOVARS
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| 67 | ; Returns:
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| 68 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 69 | ; AH: BIOS Error code
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| 70 | ; CX: Number of successfully transferred sectors
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| 71 | ; CF: 0 if transfer successful
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| 72 | ; 1 if any error
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| 73 | ; Corrupts registers:
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| 74 | ; AL, BX, DX, SI, ES
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| 75 | ;--------------------------------------------------------------------
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| 76 | ReadFromDrive:
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| 77 | ; Prepare to read data to ESSI
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| 78 | mov bx, g_rgfnPioRead
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| 79 | call InitializePiovarsInSSBPwithSectorCountInAH
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| 80 | %ifdef USE_AT
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| 81 | jc SHORT ReturnWithTransferErrorInAH
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| 82 | %endif
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| 83 |
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| 84 | ; Wait until drive is ready to transfer
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| 85 | call IdeWait_IRQorDRQ ; Wait until ready to transfer
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| 86 | jc SHORT ReturnWithTransferErrorInAH
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| 87 | xchg si, di ; ES:DI now points buffer
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| 88 |
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| 89 | mov cx, [bp+PIOVARS.wSectorsInBlock] ; Max 128
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| 90 |
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| 91 | ALIGN JUMP_ALIGN
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| 92 | .ReadNextBlockFromDrive:
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| 93 | mov dx, [bp+PIOVARS.wDataPort]
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| 94 | cmp [bp+PIOVARS.bSectorsLeft], cl
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| 95 | jbe SHORT .ReadLastBlockFromDrive
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| 96 | call [bp+PIOVARS.fnXfer]
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| 97 |
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| 98 | ; Wait until ready for next block and check for errors
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| 99 | xchg di, si ; DS:DI now points DPT
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| 100 | call IdeWait_IRQorDRQ ; Wait until ready to transfer
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| 101 | jc SHORT ReturnWithTransferErrorInAH
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| 102 | xchg si, di ; ES:DI now points buffer
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| 103 |
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| 104 | ; Increment number of successfully read sectors
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| 105 | mov cx, [bp+PIOVARS.wSectorsInBlock]
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| 106 | sub [bp+PIOVARS.bSectorsLeft], cl
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| 107 | add [bp+PIOVARS.bSectorsDone], cl
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| 108 | jmp SHORT .ReadNextBlockFromDrive
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| 109 |
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| 110 | ALIGN JUMP_ALIGN
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| 111 | .ReadLastBlockFromDrive:
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| 112 | mov cl, [bp+PIOVARS.bSectorsLeft] ; CH is already zero
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| 113 | push cx
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| 114 | call [bp+PIOVARS.fnXfer] ; Transfer possibly partial block
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| 115 |
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| 116 | ; Check for errors in last block
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| 117 | mov di, si ; DS:DI now points DPT
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| 118 | CheckErrorsAfterTransferringLastBlock:
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| 119 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_BSY)
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| 120 | call IdeWait_PollStatusFlagInBLwithTimeoutInBH
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| 121 | pop cx ; [bp+PIOVARS.bSectorsLeft]
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| 122 | jc SHORT ReturnWithTransferErrorInAH
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| 123 |
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| 124 | ; All sectors successfully transferred
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| 125 | add cx, [bp+PIOVARS.bSectorsDone] ; Never sets CF
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| 126 | ret
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| 127 |
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| 128 | ; Return number of successfully read sectors
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| 129 | ReturnWithTransferErrorInAH:
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| 130 | %ifdef USE_386
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| 131 | movzx cx, [bp+PIOVARS.bSectorsDone]
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| 132 | %else
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| 133 | mov cl, [bp+PIOVARS.bSectorsDone]
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| 134 | mov ch, 0 ; Preserve CF
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| 135 | %endif
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| 136 | ret
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| 137 |
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| 138 |
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| 139 | ;--------------------------------------------------------------------
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| 140 | ; WriteToDrive
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| 141 | ; Parameters:
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| 142 | ; AH: Number of sectors to transfer (1...128)
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| 143 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 144 | ; ES:SI: Ptr to buffer containing data
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| 145 | ; SS:BP: Ptr to PIOVARS
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| 146 | ; Returns:
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| 147 | ; AH: BIOS Error code
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| 148 | ; CX: Number of successfully transferred sectors
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| 149 | ; CF: 0 if transfer successful
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| 150 | ; 1 if any error
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| 151 | ; Corrupts registers:
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| 152 | ; AL, BX, DX, SI, ES
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| 153 | ;--------------------------------------------------------------------
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| 154 | ALIGN JUMP_ALIGN
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| 155 | WriteToDrive:
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| 156 | ; Prepare to write data from ESSI
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| 157 | mov bx, g_rgfnPioWrite
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| 158 | call InitializePiovarsInSSBPwithSectorCountInAH
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| 159 | %ifdef USE_AT
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| 160 | jc SHORT ReturnWithTransferErrorInAH
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| 161 | %endif
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| 162 |
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| 163 | ; Always poll when writing first block (IRQs are generated for following blocks)
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| 164 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRQ)
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| 165 | call IdeWait_PollStatusFlagInBLwithTimeoutInBH
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| 166 | jc SHORT ReturnWithTransferErrorInAH
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| 167 |
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| 168 | mov cx, [bp+PIOVARS.wSectorsInBlock] ; Max 128
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| 169 |
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| 170 | ALIGN JUMP_ALIGN
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| 171 | .WriteNextBlockToDrive:
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| 172 | mov dx, [bp+PIOVARS.wDataPort]
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| 173 | cmp [bp+PIOVARS.bSectorsLeft], cl
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| 174 | jbe SHORT .WriteLastBlockToDrive
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| 175 | call [bp+PIOVARS.fnXfer]
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| 176 |
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| 177 | ; Wait until ready for next block and check for errors
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| 178 | call IdeWait_IRQorDRQ ; Wait until ready to transfer
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| 179 | jc SHORT ReturnWithTransferErrorInAH
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| 180 |
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| 181 | ; Increment number of successfully written sectors
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| 182 | mov cx, [bp+PIOVARS.wSectorsInBlock]
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| 183 | sub [bp+PIOVARS.bSectorsLeft], cl
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| 184 | add [bp+PIOVARS.bSectorsDone], cl
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| 185 | jmp SHORT .WriteNextBlockToDrive
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| 186 |
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| 187 | ALIGN JUMP_ALIGN
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| 188 | .WriteLastBlockToDrive:
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| 189 | mov cl, [bp+PIOVARS.bSectorsLeft] ; CH is already zero
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| 190 | push cx
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| 191 | %ifdef USE_186
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| 192 | push CheckErrorsAfterTransferringLastBlock
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| 193 | jmp [bp+PIOVARS.fnXfer] ; Transfer possibly partial block
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| 194 | %else
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| 195 | call [bp+PIOVARS.fnXfer] ; Transfer possibly partial block
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| 196 | jmp SHORT CheckErrorsAfterTransferringLastBlock
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| 197 | %endif
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| 198 |
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| 199 |
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| 200 | ;--------------------------------------------------------------------
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| 201 | ; InitializePiovarsInSSBPwithSectorCountInAH
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| 202 | ; Parameters:
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| 203 | ; AH: Number of sectors to transfer (1...128)
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| 204 | ; BX: Offset to transfer function lookup table
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| 205 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 206 | ; ES:SI: Ptr to data buffer
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| 207 | ; SS:BP: Ptr to PIOVARS
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| 208 | ; Returns:
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| 209 | ; ES:SI: Normalized pointer
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| 210 | ; AH: INT 13h Error Code (only when CF set)
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| 211 | ; CF: Set of failed to normalize pointer (segment overflow)
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| 212 | ; Cleared if success
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| 213 | ; Corrupts registers:
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| 214 | ; AL, BX, DX
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| 215 | ;--------------------------------------------------------------------
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| 216 | ALIGN JUMP_ALIGN
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| 217 | InitializePiovarsInSSBPwithSectorCountInAH:
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| 218 | ; Store sizes and Data Port
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| 219 | mov [bp+PIOVARS.bSectorsLeft], ah
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| 220 | %ifdef USE_AT
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| 221 | xchg dx, ax
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| 222 | %endif
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| 223 | mov ax, [di+DPT.wBasePort]
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| 224 | mov [bp+PIOVARS.wDataPort], ax
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| 225 | eMOVZX ax, [di+DPT_ATA.bBlockSize]
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| 226 | mov [bp+PIOVARS.wSectorsInBlock], ax
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| 227 | mov [bp+PIOVARS.bSectorsDone], ah ; Zero
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| 228 |
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| 229 | ; Get transfer function based on bus type
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| 230 | xchg ax, bx ; Lookup table offset to AX
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| 231 | mov bl, [di+DPT_ATA.bDevice]
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| 232 | %ifdef MODULE_8BIT_IDE_ADVANCED
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| 233 | mov dl, bl
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| 234 | %endif
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| 235 | add bx, ax
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| 236 | mov ax, [cs:bx] ; Load offset to transfer function
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| 237 | mov [bp+PIOVARS.fnXfer], ax
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| 238 |
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| 239 | ; Normalize pointer for PIO-transfers and convert to physical address for DMA transfers
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| 240 | %ifdef MODULE_8BIT_IDE_ADVANCED
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| 241 | cmp dl, DEVICE_8BIT_XTCF_DMA
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| 242 | jb SHORT IdeTransfer_NormalizePointerInESSI
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| 243 |
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| 244 | ; Convert ES:SI to physical address
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| 245 | %ifdef USE_186 ; Bytes EU Cycles(286)
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| 246 | mov ax, es ; 2 2
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| 247 | rol ax, 4 ; 3 9
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| 248 | mov dx, ax ; 2 2
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| 249 | and ax, BYTE 0Fh; 3 3
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| 250 | xor dx, ax ; 2 2
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| 251 | add si, dx ; 2 2
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| 252 | adc al, ah ; 2 2
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| 253 | mov es, ax ; 2 2
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| 254 | ;------------------------------------
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| 255 | ; 18 24
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| 256 | %else ; 808x
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| 257 |
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| 258 | %if 0
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| 259 | ; Bytes EU Cycles(808x)
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| 260 | mov al, 4 ; 2 4
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| 261 | mov dx, es ; 2 2
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| 262 | xchg cx, ax ; 1 3
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| 263 | rol dx, cl ; 2 24
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| 264 | mov cx, dx ; 2 2
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| 265 | xchg cx, ax ; 1 3
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| 266 | and ax, BYTE 0Fh; 3 4
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| 267 | xor dx, ax ; 2 3
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| 268 | add si, dx ; 2 3
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| 269 | adc al, ah ; 2 3
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| 270 | mov es, ax ; 2 2
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| 271 | ;------------------------------------
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| 272 | ; 21 53
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| 273 | ;
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| 274 | ; Judging by the Execution Unit cycle count the above block of code is
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| 275 | ; apparently slower. However, the shifts and rotates in the block below
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| 276 | ; execute faster than the Bus Interface Unit on an 8088 can fetch them,
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| 277 | ; thus causing the EU to starve. The difference in true execution speed
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| 278 | ; (if any) might not be worth the extra 5 bytes.
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| 279 | ; In other words, we could use a real world test here.
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| 280 | ;
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| 281 | %endif ; 0
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| 282 | ; Bytes EU Cycles(808x/286)
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| 283 | xor dx, dx ; 2 3/2
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| 284 | mov ax, es ; 2 2/2
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| 285 | %rep 4
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| 286 | shl ax, 1 ; 8 8/8
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| 287 | rcl dx, 1 ; 8 8/8
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| 288 | %endrep
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| 289 | add si, ax ; 2 3/2
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| 290 | adc dl, dh ; 2 3/2
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| 291 | mov es, dx ; 2 2/2
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| 292 | ;------------------------------------
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| 293 | %endif ; 26 29/26
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| 294 | clc
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| 295 | ret
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| 296 | %endif ; MODULE_8BIT_IDE_ADVANCED
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| 297 | ; Fall to IdeTransfer_NormalizePointerInESSI if no MODULE_8BIT_IDE
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| 298 |
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| 299 |
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| 300 | ;--------------------------------------------------------------------
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| 301 | ; IdeTransfer_NormalizePointerInESSI
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| 302 | ; Parameters:
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| 303 | ; DH: Number of sectors to transfer (when USE_AT defined)
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| 304 | ; ES:SI: Ptr to be normalized
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| 305 | ; Returns:
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| 306 | ; ES:SI: Normalized pointer (SI = 0...15)
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| 307 | ; AH: INT 13h Error Code (only when CF set)
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| 308 | ; CF: Set of failed to normalize pointer (segment overflow)
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| 309 | ; Cleared if success
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| 310 | ; Corrupts registers:
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| 311 | ; AX, DX
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| 312 | ;--------------------------------------------------------------------
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| 313 | IdeTransfer_NormalizePointerInESSI:
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| 314 | ; Normalization can cause segment overflow if it is done when not needed
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| 315 | ; (I don't know if any software calls with such seg:off address).
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| 316 | ; This does not apply to XT systems since nothing will write to main BIOS ROM.
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| 317 | ; On AT systems things are quite different, even in protected mode the address
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| 318 | ; is passed in seg:offset form and HMA is accessible in real mode.
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| 319 | %ifdef USE_AT
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| 320 | xor dl, dl
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| 321 | shl dx, 1
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| 322 | dec dx ; Prevents normalization when bytes + offset will be zero
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| 323 | add dx, si
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| 324 | jc SHORT .NormalizationRequired
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| 325 | ret
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| 326 | .NormalizationRequired:
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| 327 | %endif ; USE_AT
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| 328 |
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| 329 | NORMALIZE_FAR_POINTER es, si, ax, dx
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| 330 | %ifdef USE_AT ; CF is always clear for XT builds
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| 331 | jc SHORT .SegmentOverflow
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| 332 | ret
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| 333 | .SegmentOverflow:
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| 334 | mov ah, RET_HD_INVALID
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| 335 | %endif
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| 336 | ret
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| 337 |
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| 338 |
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| 339 |
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| 340 | ; Lookup tables to get transfer function based on bus type
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| 341 | ALIGN WORD_ALIGN
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| 342 | g_rgfnPioRead:
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| 343 | dw IdePioBlock_ReadFrom16bitDataPort ; 0, DEVICE_16BIT_ATA
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| 344 | dw IdePioBlock_ReadFrom32bitDataPort ; 1, DEVICE_32BIT_ATA
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| 345 | %ifdef MODULE_8BIT_IDE
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| 346 | dw IdePioBlock_ReadFrom8bitDataPort ; 2, DEVICE_8BIT_ATA
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| 347 | dw IdePioBlock_ReadFromXtideRev1 ; 3, DEVICE_8BIT_XTIDE_REV1
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| 348 | dw IdePioBlock_ReadFrom16bitDataPort ; 4, DEVICE_8BIT_XTIDE_REV2
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| 349 | dw IdePioBlock_ReadFrom8bitDataPort ; 5, DEVICE_8BIT_XTCF_PIO8
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| 350 | dw IdePioBlock_ReadFrom16bitDataPort ; 6, DEVICE_8BIT_XTCF_PIO8_WITH_BIU_OFFLOAD
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| 351 | %ifdef MODULE_8BIT_IDE_ADVANCED
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| 352 | dw IdeDmaBlock_ReadFromXTCF ; 7, DEVICE_8BIT_XTCF_DMA
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| 353 | %endif ; MODULE_8BIT_IDE_ADVANCED
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| 354 | %endif ; MODULE_8BIT_IDE
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| 355 |
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| 356 |
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| 357 | g_rgfnPioWrite:
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| 358 | dw IdePioBlock_WriteTo16bitDataPort ; 0, DEVICE_16BIT_ATA
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| 359 | dw IdePioBlock_WriteTo32bitDataPort ; 1, DEVICE_32BIT_ATA
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| 360 | %ifdef MODULE_8BIT_IDE
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| 361 | dw IdePioBlock_WriteTo8bitDataPort ; 2, DEVICE_8BIT_ATA
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| 362 | dw IdePioBlock_WriteToXtideRev1 ; 3, DEVICE_8BIT_XTIDE_REV1
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| 363 | dw IdePioBlock_WriteToXtideRev2 ; 4, DEVICE_8BIT_XTIDE_REV2
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| 364 | dw IdePioBlock_WriteTo8bitDataPort ; 5, DEVICE_8BIT_XTCF_PIO8
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| 365 | dw IdePioBlock_WriteTo16bitDataPort ; 6, DEVICE_8BIT_XTCF_PIO8_WITH_BIU_OFFLOAD
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| 366 | %ifdef MODULE_8BIT_IDE_ADVANCED
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| 367 | dw IdeDmaBlock_WriteToXTCF ; 7, DEVICE_8BIT_XTCF_DMA
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| 368 | %endif ; MODULE_8BIT_IDE_ADVANCED
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| 369 | %endif ; MODULE_8BIT_IDE
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