| 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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| 5 | ; XTIDE Universal BIOS and Associated Tools
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| 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 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 MEMPIOVARS
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| 23 | .wWordsInBlock resb 2 ; 0, Block size in WORDs
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| 24 | .wWordsLeft resb 2 ; 2, WORDs left to transfer
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| 25 | .wWordsDone resb 2 ; 4, Number of sectors xferred
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| 26 | ; TODO: The above word vars could just as well be byte vars?
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| 27 | resb 1 ; 6,
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| 28 | resb 1 ; 7, IDEPACK.bDeviceControl
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| 29 | .fpDPT resb 4 ; 8, Far pointer to DPT
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| 30 | endstruc
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| 31 |
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| 32 |
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| 33 | ; Section containing code
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| 34 | SECTION .text
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| 35 |
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| 36 | ;--------------------------------------------------------------------
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| 37 | ; MemIdeTransfer_StartWithCommandInAL
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| 38 | ; Parameters:
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| 39 | ; AL: IDE command that was used to start the transfer
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| 40 | ; (all PIO read and write commands including Identify Device)
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| 41 | ; ES:SI: Ptr to normalized data buffer
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| 42 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 43 | ; SS:BP: Ptr to IDEPACK
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| 44 | ; Returns:
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| 45 | ; AH: INT 13h Error Code
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| 46 | ; CX: Number of successfully transferred sectors
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| 47 | ; CF: Cleared if success, Set if error
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| 48 | ; Corrupts registers:
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| 49 | ; AL, BX, DX, SI, ES
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| 50 | ;--------------------------------------------------------------------
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| 51 | ALIGN JUMP_ALIGN
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| 52 | MemIdeTransfer_StartWithCommandInAL:
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| 53 | push cs ; We push CS here (segment of SAW) and later pop it to DS (reads) or ES (writes)
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| 54 |
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| 55 | ; Initialize MEMPIOVARS
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| 56 | xor cx, cx
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| 57 | mov [bp+MEMPIOVARS.wWordsDone], cx
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| 58 | mov ch, [bp+IDEPACK.bSectorCount]
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| 59 | mov [bp+MEMPIOVARS.wWordsLeft], cx
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| 60 | mov ch, [di+DPT_ATA.bBlockSize]
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| 61 | mov [bp+MEMPIOVARS.wWordsInBlock], cx
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| 62 | mov [bp+MEMPIOVARS.fpDPT], di
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| 63 | mov [bp+MEMPIOVARS.fpDPT+2], ds
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| 64 |
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| 65 | ; Are we reading or writing?
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| 66 | 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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| 67 | jnz SHORT WriteToSectorAccessWindow
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| 68 | cmp al, COMMAND_WRITE_MULTIPLE
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| 69 | je SHORT WriteToSectorAccessWindow
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| 70 | ; Fall to ReadFromSectorAccessWindow
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| 71 |
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| 72 | ;--------------------------------------------------------------------
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| 73 | ; ReadFromSectorAccessWindow
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| 74 | ; Parameters:
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| 75 | ; Stack: Segment part of ptr to Sector Access Window
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| 76 | ; ES:SI: Normalized ptr to buffer to receive data
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| 77 | ; SS:BP: Ptr to MEMPIOVARS
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| 78 | ; Returns:
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| 79 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 80 | ; AH: BIOS Error code
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| 81 | ; CX: Number of successfully transferred sectors
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| 82 | ; CF: 0 if transfer successful
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| 83 | ; 1 if any error
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| 84 | ; Corrupts registers:
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| 85 | ; AL, BX, DX, SI, ES
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| 86 | ;--------------------------------------------------------------------
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| 87 | ReadFromSectorAccessWindow:
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| 88 | pop ds ; CS -> DS
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| 89 | mov di, si ; ES:DI = destination
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| 90 | mov si, JRIDE_SECTOR_ACCESS_WINDOW_OFFSET ; DS:SI = source
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| 91 |
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| 92 | call WaitUntilReadyToTransferNextBlock
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| 93 | jc SHORT ReturnWithMemoryIOtransferErrorInAH
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| 94 |
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| 95 | mov cx, [bp+MEMPIOVARS.wWordsInBlock]
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| 96 |
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| 97 | ALIGN JUMP_ALIGN
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| 98 | .ReadNextBlockFromDrive:
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| 99 | cmp [bp+MEMPIOVARS.wWordsLeft], cx
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| 100 | jbe SHORT .ReadLastBlockFromDrive
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| 101 | call ReadSingleBlockFromSectorAccessWindowInDSSItoESDI
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| 102 | call WaitUntilReadyToTransferNextBlock
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| 103 | jc SHORT ReturnWithMemoryIOtransferErrorInAH
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| 104 |
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| 105 | ; Increment number of successfully read WORDs
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| 106 | mov cx, [bp+MEMPIOVARS.wWordsInBlock]
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| 107 | sub [bp+MEMPIOVARS.wWordsLeft], cx
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| 108 | add [bp+MEMPIOVARS.wWordsDone], cx
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| 109 | jmp SHORT .ReadNextBlockFromDrive
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| 110 |
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| 111 | ALIGN JUMP_ALIGN
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| 112 | .ReadLastBlockFromDrive:
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| 113 | mov ch, [bp+MEMPIOVARS.wWordsLeft+1] ; Sectors left
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| 114 | call ReadSingleBlockFromSectorAccessWindowInDSSItoESDI
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| 115 |
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| 116 | ; Check for errors in last block
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| 117 | CheckErrorsAfterTransferringLastMemoryMappedBlock:
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| 118 | lds di, [bp+MEMPIOVARS.fpDPT] ; DPT now in DS:DI
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| 119 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRDY)
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| 120 | call IDEDEVICE%+Wait_PollStatusFlagInBLwithTimeoutInBH
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| 121 |
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| 122 | ; Return number of successfully transferred sectors
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| 123 | ReturnWithMemoryIOtransferErrorInAH:
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| 124 | lds di, [bp+MEMPIOVARS.fpDPT] ; DPT now in DS:DI
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| 125 | mov cx, [bp+MEMPIOVARS.wWordsDone]
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| 126 | jc SHORT .ConvertTransferredWordsInCXtoSectors
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| 127 | add cx, [bp+MEMPIOVARS.wWordsLeft] ; Never sets CF
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| 128 | .ConvertTransferredWordsInCXtoSectors:
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| 129 | xchg cl, ch
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| 130 | ret
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| 131 |
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| 132 |
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| 133 | ;--------------------------------------------------------------------
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| 134 | ; WriteToSectorAccessWindow
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| 135 | ; Parameters:
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| 136 | ; Stack: Segment part of ptr to Sector Access Window
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| 137 | ; ES:SI: Normalized ptr to buffer containing data
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| 138 | ; SS:BP: Ptr to MEMPIOVARS
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| 139 | ; Returns:
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| 140 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 141 | ; AH: BIOS Error code
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| 142 | ; CX: Number of successfully transferred sectors
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| 143 | ; CF: 0 if transfer successful
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| 144 | ; 1 if any error
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| 145 | ; Corrupts registers:
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| 146 | ; AL, BX, DX, SI, ES
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| 147 | ;--------------------------------------------------------------------
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| 148 | ALIGN JUMP_ALIGN
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| 149 | WriteToSectorAccessWindow:
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| 150 | push es
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| 151 | pop ds
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| 152 | pop es ; CS -> ES
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| 153 | mov di, JRIDE_SECTOR_ACCESS_WINDOW_OFFSET
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| 154 |
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| 155 | ; Always poll when writing first block (IRQs are generated for following blocks)
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| 156 | call WaitUntilReadyToTransferNextBlock
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| 157 | jc SHORT ReturnWithMemoryIOtransferErrorInAH
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| 158 |
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| 159 | mov cx, [bp+MEMPIOVARS.wWordsInBlock]
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| 160 |
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| 161 | ALIGN JUMP_ALIGN
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| 162 | .WriteNextBlockToDrive:
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| 163 | cmp [bp+MEMPIOVARS.wWordsLeft], cx
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| 164 | jbe SHORT .WriteLastBlockToDrive
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| 165 | call WriteSingleBlockFromDSSIToSectorAccessWindowInESDI
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| 166 | call WaitUntilReadyToTransferNextBlock
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| 167 | jc SHORT ReturnWithMemoryIOtransferErrorInAH
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| 168 |
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| 169 | ; Increment number of successfully written WORDs
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| 170 | mov cx, [bp+MEMPIOVARS.wWordsInBlock]
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| 171 | sub [bp+MEMPIOVARS.wWordsLeft], cx
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| 172 | add [bp+MEMPIOVARS.wWordsDone], cx
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| 173 | jmp SHORT .WriteNextBlockToDrive
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| 174 |
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| 175 | ALIGN JUMP_ALIGN
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| 176 | .WriteLastBlockToDrive:
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| 177 | mov ch, [bp+MEMPIOVARS.wWordsLeft+1] ; Sectors left
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| 178 | ePUSH_T bx, CheckErrorsAfterTransferringLastMemoryMappedBlock
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| 179 | ; Fall to WriteSingleBlockFromDSSIToSectorAccessWindowInESDI
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| 180 |
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| 181 | ;--------------------------------------------------------------------
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| 182 | ; WriteSingleBlockFromDSSIToSectorAccessWindowInESDI
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| 183 | ; Parameters:
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| 184 | ; CH: Number of sectors in block
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| 185 | ; DS:SI: Normalized ptr to source buffer
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| 186 | ; ES:DI: Ptr to Sector Access Window
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| 187 | ; Returns:
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| 188 | ; CX, DX: Zero
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| 189 | ; SI: Updated
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| 190 | ; Corrupts registers:
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| 191 | ; BX
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| 192 | ;--------------------------------------------------------------------
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| 193 | ALIGN JUMP_ALIGN
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| 194 | WriteSingleBlockFromDSSIToSectorAccessWindowInESDI:
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| 195 | mov bx, di
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| 196 | eMOVZX dx, ch
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| 197 | xor cl, cl
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| 198 | ALIGN JUMP_ALIGN
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| 199 | .WriteBlock:
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| 200 | mov ch, JRIDE_SECTOR_ACCESS_WINDOW_SIZE >> 9
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| 201 | rep movsw
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| 202 | mov di, bx ; Reset for next sector
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| 203 | dec dx
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| 204 | jnz SHORT .WriteBlock
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| 205 | ret
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| 206 |
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| 207 |
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| 208 | ;--------------------------------------------------------------------
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| 209 | ; ReadSingleBlockFromSectorAccessWindowInDSSItoESDI
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| 210 | ; Parameters:
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| 211 | ; CH: Number of sectors in block
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| 212 | ; ES:DI: Normalized ptr to buffer to receive data (destination)
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| 213 | ; DS:SI: Ptr to Sector Access Window (source)
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| 214 | ; Returns:
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| 215 | ; CX, DX: Zero
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| 216 | ; DI: Updated
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| 217 | ; Corrupts registers:
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| 218 | ; BX
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| 219 | ;--------------------------------------------------------------------
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| 220 | ALIGN JUMP_ALIGN
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| 221 | ReadSingleBlockFromSectorAccessWindowInDSSItoESDI:
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| 222 | mov bx, si
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| 223 | eMOVZX dx, ch
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| 224 | xor cl, cl
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| 225 | ALIGN JUMP_ALIGN
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| 226 | .ReadBlock:
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| 227 | mov ch, JRIDE_SECTOR_ACCESS_WINDOW_SIZE >> 9
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| 228 | rep movsw
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| 229 | mov si, bx ; Reset for next sector
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| 230 | dec dx
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| 231 | jnz SHORT .ReadBlock
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| 232 | ret
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| 233 |
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| 234 |
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| 235 | ;--------------------------------------------------------------------
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| 236 | ; WaitUntilReadyToTransferNextBlock
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| 237 | ; Parameters:
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| 238 | ; SS:BP: Ptr to MEMPIOVARS
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| 239 | ; Returns:
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| 240 | ; AH: INT 13h Error Code
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| 241 | ; CF: Cleared if success, Set if error
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| 242 | ; Corrupts registers:
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| 243 | ; AL, BX, CX, DX
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| 244 | ;--------------------------------------------------------------------
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| 245 | ALIGN JUMP_ALIGN
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| 246 | WaitUntilReadyToTransferNextBlock:
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| 247 | push ds
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| 248 | push di
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| 249 | lds di, [bp+MEMPIOVARS.fpDPT] ; DPT now in DS:DI
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| 250 | call IDEDEVICE%+Wait_IRQorDRQ ; Always polls
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| 251 | pop di
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| 252 | pop ds
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| 253 | ret
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| 254 |
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| 255 |
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| 256 | %if JRIDE_SECTOR_ACCESS_WINDOW_SIZE <> 512
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| 257 | %error "JRIDE_SECTOR_ACCESS_WINDOW_SIZE is no longer equal to 512. MemIdeTransfer.asm needs changes."
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| 258 | %endif
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| 259 |
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