[238] | 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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[376] | 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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[238] | 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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[242] | 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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[238] | 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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[242] | 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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[238] | 55 | ; Initialize MEMPIOVARS |
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[242] | 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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[365] | 60 | mov ch, [di+DPT_ATA.bBlockSize] |
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[242] | 61 | mov [bp+MEMPIOVARS.wWordsInBlock], cx |
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[238] | 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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[242] | 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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[238] | 71 | |
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[242] | 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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[294] | 82 | ; CF: 0 if transfer successful |
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[242] | 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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[267] | 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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[238] | 91 | |
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[242] | 92 | call WaitUntilReadyToTransferNextBlock |
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| 93 | jc SHORT ReturnWithMemoryIOtransferErrorInAH |
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| 94 | |
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[267] | 95 | mov cx, [bp+MEMPIOVARS.wWordsInBlock] |
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[242] | 96 | |
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[238] | 97 | ALIGN JUMP_ALIGN |
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[242] | 98 | .ReadNextBlockFromDrive: |
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[267] | 99 | cmp [bp+MEMPIOVARS.wWordsLeft], cx |
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[242] | 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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[238] | 104 | |
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[242] | 105 | ; Increment number of successfully read WORDs |
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[267] | 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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[242] | 109 | jmp SHORT .ReadNextBlockFromDrive |
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[238] | 110 | |
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[242] | 111 | ALIGN JUMP_ALIGN |
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| 112 | .ReadLastBlockFromDrive: |
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[267] | 113 | mov ch, [bp+MEMPIOVARS.wWordsLeft+1] ; Sectors left |
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[242] | 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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[267] | 125 | mov cx, [bp+MEMPIOVARS.wWordsDone] |
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[242] | 126 | jc SHORT .ConvertTransferredWordsInCXtoSectors |
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[267] | 127 | add cx, [bp+MEMPIOVARS.wWordsLeft] ; Never sets CF |
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[242] | 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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[238] | 133 | ;-------------------------------------------------------------------- |
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[242] | 134 | ; WriteToSectorAccessWindow |
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[238] | 135 | ; Parameters: |
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[242] | 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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[238] | 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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[294] | 143 | ; CF: 0 if transfer successful |
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[238] | 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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[242] | 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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[238] | 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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[267] | 159 | mov cx, [bp+MEMPIOVARS.wWordsInBlock] |
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[242] | 160 | |
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[238] | 161 | ALIGN JUMP_ALIGN |
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| 162 | .WriteNextBlockToDrive: |
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[267] | 163 | cmp [bp+MEMPIOVARS.wWordsLeft], cx |
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[238] | 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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[267] | 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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[238] | 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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[267] | 177 | mov ch, [bp+MEMPIOVARS.wWordsLeft+1] ; Sectors left |
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[266] | 178 | ePUSH_T bx, CheckErrorsAfterTransferringLastMemoryMappedBlock |
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[242] | 179 | ; Fall to WriteSingleBlockFromDSSIToSectorAccessWindowInESDI |
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[238] | 180 | |
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| 181 | ;-------------------------------------------------------------------- |
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| 182 | ; WriteSingleBlockFromDSSIToSectorAccessWindowInESDI |
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| 183 | ; Parameters: |
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[242] | 184 | ; CH: Number of sectors in block |
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[238] | 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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[242] | 191 | ; BX |
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[238] | 192 | ;-------------------------------------------------------------------- |
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| 193 | ALIGN JUMP_ALIGN |
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| 194 | WriteSingleBlockFromDSSIToSectorAccessWindowInESDI: |
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[242] | 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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[238] | 201 | rep movsw |
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[242] | 202 | mov di, bx ; Reset for next sector |
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[238] | 203 | dec dx |
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[242] | 204 | jnz SHORT .WriteBlock |
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[238] | 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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[242] | 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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[238] | 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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[242] | 218 | ; BX |
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[238] | 219 | ;-------------------------------------------------------------------- |
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| 220 | ALIGN JUMP_ALIGN |
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| 221 | ReadSingleBlockFromSectorAccessWindowInDSSItoESDI: |
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[242] | 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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[238] | 228 | rep movsw |
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[242] | 229 | mov si, bx ; Reset for next sector |
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[238] | 230 | dec dx |
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[242] | 231 | jnz SHORT .ReadBlock |
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[238] | 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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[242] | 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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