| 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, 2011-2012 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 PIOVARS
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| 23 | .wDataPort resb 2 ; 0, IDE Data Port
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| 24 | .fnXfer resb 2 ; 2, Offset to transfer function
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| 25 | .wSectorsInBlock resb 2 ; 4, 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 normalized 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: Normalized 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 |
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| 81 | ; Wait until drive is ready to transfer
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| 82 | call IdeWait_IRQorDRQ ; Wait until ready to transfer
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| 83 | jc SHORT ReturnWithTransferErrorInAH
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| 84 | xchg si, di ; ES:DI now points buffer
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| 85 |
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| 86 | mov cx, [bp+PIOVARS.wSectorsInBlock] ; Max 128
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| 87 |
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| 88 | ALIGN JUMP_ALIGN
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| 89 | .ReadNextBlockFromDrive:
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| 90 | mov dx, [bp+PIOVARS.wDataPort]
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| 91 | cmp [bp+PIOVARS.bSectorsLeft], cl
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| 92 | jbe SHORT .ReadLastBlockFromDrive
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| 93 | call [bp+PIOVARS.fnXfer]
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| 94 |
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| 95 | ; Wait until ready for next block and check for errors
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| 96 | xchg di, si ; DS:DI now points DPT
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| 97 | call IdeWait_IRQorDRQ ; Wait until ready to transfer
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| 98 | jc SHORT ReturnWithTransferErrorInAH
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| 99 | xchg si, di ; ES:DI now points buffer
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| 100 |
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| 101 | ; Increment number of successfully read sectors
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| 102 | mov cx, [bp+PIOVARS.wSectorsInBlock]
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| 103 | sub [bp+PIOVARS.bSectorsLeft], cl
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| 104 | add [bp+PIOVARS.bSectorsDone], cl
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| 105 | jmp SHORT .ReadNextBlockFromDrive
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| 106 |
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| 107 | ALIGN JUMP_ALIGN
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| 108 | .ReadLastBlockFromDrive:
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| 109 | mov cl, [bp+PIOVARS.bSectorsLeft] ; CH is already zero
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| 110 | call [bp+PIOVARS.fnXfer] ; Transfer possibly partial block
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| 111 |
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| 112 | ; Check for errors in last block
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| 113 | mov di, si ; DS:DI now points DPT
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| 114 | CheckErrorsAfterTransferringLastBlock:
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| 115 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRDY)
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| 116 | call IdeWait_PollStatusFlagInBLwithTimeoutInBH
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| 117 |
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| 118 | ; Return number of successfully read sectors
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| 119 | ReturnWithTransferErrorInAH:
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| 120 | %ifdef USE_386
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| 121 | movzx cx, [bp+PIOVARS.bSectorsDone]
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| 122 | %else
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| 123 | mov cl, [bp+PIOVARS.bSectorsDone]
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| 124 | mov ch, 0 ; Preserve CF
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| 125 | %endif
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| 126 | ret
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| 127 |
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| 128 |
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| 129 | ;--------------------------------------------------------------------
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| 130 | ; WriteToDrive
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| 131 | ; Parameters:
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| 132 | ; AH: Number of sectors to transfer (1...128)
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| 133 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 134 | ; ES:SI: Normalized ptr to buffer containing data
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| 135 | ; SS:BP: Ptr to PIOVARS
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| 136 | ; Returns:
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| 137 | ; AH: BIOS Error code
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| 138 | ; CX: Number of successfully transferred sectors
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| 139 | ; CF: 0 if transfer successful
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| 140 | ; 1 if any error
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| 141 | ; Corrupts registers:
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| 142 | ; AL, BX, DX, SI, ES
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| 143 | ;--------------------------------------------------------------------
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| 144 | ALIGN JUMP_ALIGN
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| 145 | WriteToDrive:
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| 146 | ; Prepare to write data from ESSI
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| 147 | mov bx, g_rgfnPioWrite
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| 148 | call InitializePiovarsInSSBPwithSectorCountInAH
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| 149 |
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| 150 | ; Always poll when writing first block (IRQs are generated for following blocks)
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| 151 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRQ)
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| 152 | call IdeWait_PollStatusFlagInBLwithTimeoutInBH
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| 153 | jc SHORT ReturnWithTransferErrorInAH
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| 154 |
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| 155 | mov cx, [bp+PIOVARS.wSectorsInBlock] ; Max 128
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| 156 |
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| 157 | ALIGN JUMP_ALIGN
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| 158 | .WriteNextBlockToDrive:
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| 159 | mov dx, [bp+PIOVARS.wDataPort]
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| 160 | cmp [bp+PIOVARS.bSectorsLeft], cl
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| 161 | jbe SHORT .WriteLastBlockToDrive
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| 162 | call [bp+PIOVARS.fnXfer]
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| 163 |
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| 164 | ; Wait until ready for next block and check for errors
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| 165 | call IdeWait_IRQorDRQ ; Wait until ready to transfer
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| 166 | jc SHORT ReturnWithTransferErrorInAH
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| 167 |
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| 168 | ; Increment number of successfully written sectors
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| 169 | mov cx, [bp+PIOVARS.wSectorsInBlock]
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| 170 | sub [bp+PIOVARS.bSectorsLeft], cl
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| 171 | add [bp+PIOVARS.bSectorsDone], cl
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| 172 | jmp SHORT .WriteNextBlockToDrive
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| 173 |
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| 174 | ALIGN JUMP_ALIGN
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| 175 | .WriteLastBlockToDrive:
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| 176 | mov cl, [bp+PIOVARS.bSectorsLeft] ; CH is already zero
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| 177 | %ifdef USE_186
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| 178 | push CheckErrorsAfterTransferringLastBlock
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| 179 | jmp [bp+PIOVARS.fnXfer] ; Transfer possibly partial block
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| 180 | %else
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| 181 | call [bp+PIOVARS.fnXfer] ; Transfer possibly partial block
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| 182 | jmp SHORT CheckErrorsAfterTransferringLastBlock
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| 183 | %endif
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| 184 |
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| 185 |
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| 186 | ;--------------------------------------------------------------------
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| 187 | ; InitializePiovarsInSSBPwithSectorCountInAH
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| 188 | ; Parameters:
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| 189 | ; AH: Number of sectors to transfer (1...128)
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| 190 | ; BX: Offset to transfer function lookup table
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| 191 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 192 | ; SS:BP: Ptr to PIOVARS
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| 193 | ; Returns:
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| 194 | ; Nothing
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| 195 | ; Corrupts registers:
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| 196 | ; AX, BX, DX
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| 197 | ;--------------------------------------------------------------------
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| 198 | ALIGN JUMP_ALIGN
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| 199 | InitializePiovarsInSSBPwithSectorCountInAH:
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| 200 | ; Store sizes
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| 201 | mov [bp+PIOVARS.bSectorsLeft], ah
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| 202 | eMOVZX ax, [di+DPT_ATA.bBlockSize]
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| 203 | mov [bp+PIOVARS.wSectorsInBlock], ax
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| 204 | mov [bp+PIOVARS.bSectorsDone], ah ; Zero
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| 205 |
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| 206 | ; Get transfer function based on bus type
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| 207 | xchg ax, bx ; Lookup table offset to AX
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| 208 | mov bl, [di+DPT.bIdevarsOffset] ; CS:BX now points to IDEVARS
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| 209 | mov dx, [cs:bx+IDEVARS.wPort] ; Load IDE Data port address
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| 210 | mov bl, [di+DPT_ATA.bDevice]
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| 211 | add bx, ax
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| 212 |
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| 213 | mov [bp+PIOVARS.wDataPort], dx
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| 214 | mov ax, [cs:bx] ; Load offset to transfer function
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| 215 | mov [bp+PIOVARS.fnXfer], ax
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| 216 | ret
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| 217 |
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| 218 |
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| 219 | ;--------------------------------------------------------------------
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| 220 | ; ReadBlockFromXtideRev1 XTIDE rev 1
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| 221 | ; ReadBlockFromXtideRev2 XTIDE rev 2 or rev 1 with swapped A0 and A3 (chuck-mod)
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| 222 | ; ReadBlockFrom16bitDataPort Normal 16-bit IDE
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| 223 | ; ReadBlockFrom32bitDataPort VLB/PCI 32-bit IDE
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| 224 | ; Parameters:
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| 225 | ; CX: Block size in 512 byte sectors
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| 226 | ; DX: IDE Data port address
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| 227 | ; ES:DI: Normalized ptr to buffer to receive data
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| 228 | ; Returns:
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| 229 | ; Nothing
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| 230 | ; Corrupts registers:
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| 231 | ; AX, BX, CX
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| 232 | ;--------------------------------------------------------------------
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| 233 | %ifdef MODULE_8BIT_IDE
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| 234 |
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| 235 | ALIGN JUMP_ALIGN
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| 236 | ReadBlockFromXtideRev1:
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| 237 | UNROLL_SECTORS_IN_CX_TO_QWORDS
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| 238 | mov bl, 8 ; Bit mask for toggling data low/high reg
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| 239 | ALIGN JUMP_ALIGN
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| 240 | .InswLoop:
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| 241 | XTIDE_INSW
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| 242 | XTIDE_INSW
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| 243 | XTIDE_INSW
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| 244 | XTIDE_INSW
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| 245 | loop .InswLoop
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| 246 | ret
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| 247 |
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| 248 | ;--------------------------------------------------------------------
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| 249 | %ifndef USE_186 ; 8086/8088 compatible WORD read
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| 250 | ALIGN JUMP_ALIGN
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| 251 | ReadBlockFromXtideRev2:
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| 252 | UNROLL_SECTORS_IN_CX_TO_QWORDS
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| 253 | ALIGN JUMP_ALIGN
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| 254 | .ReadNextQword:
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| 255 | in ax, dx ; Read 1st WORD
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| 256 | stosw ; Store 1st WORD to [ES:DI]
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| 257 | in ax, dx
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| 258 | stosw ; 2nd
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| 259 | in ax, dx
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| 260 | stosw ; 3rd
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| 261 | in ax, dx
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| 262 | stosw ; 4th
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| 263 | loop .ReadNextQword
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| 264 | ret
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| 265 | %endif
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| 266 |
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| 267 | %endif ; MODULE_8BIT_IDE
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| 268 |
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| 269 | ;--------------------------------------------------------------------
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| 270 | ALIGN JUMP_ALIGN
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| 271 | ReadBlockFrom16bitDataPort:
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| 272 | xchg cl, ch ; Sectors to WORDs
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| 273 | rep
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| 274 | db 6Dh ; INSW (we want this in XT build)
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| 275 | ret
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| 276 |
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| 277 | ;--------------------------------------------------------------------
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| 278 | ALIGN JUMP_ALIGN
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| 279 | ReadBlockFrom32bitDataPort:
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| 280 | db 0C1h ; SHL
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| 281 | db 0E1h ; CX
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| 282 | db 7 ; 7 (Sectors to DWORDs)
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| 283 | rep
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| 284 | db 66h ; Override operand size to 32-bit
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| 285 | db 6Dh ; INSW/INSD
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| 286 | ret
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| 287 |
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| 288 |
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| 289 | ;--------------------------------------------------------------------
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| 290 | ; WriteBlockToXtideRev1 XTIDE rev 1
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| 291 | ; WriteBlockToXtideRev2 XTIDE rev 2 or rev 1 with swapped A0 and A3 (chuck-mod)
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| 292 | ; WriteBlockToFastXtide Fast XTIDE (CPLD v2 project)
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| 293 | ; WriteBlockTo16bitDataPort Normal 16-bit IDE
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| 294 | ; WriteBlockTo32bitDataPort VLB/PCI 32-bit IDE
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| 295 | ; Parameters:
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| 296 | ; CX: Block size in 512-byte sectors
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| 297 | ; DX: IDE Data port address
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| 298 | ; ES:SI: Normalized ptr to buffer containing data
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| 299 | ; Returns:
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| 300 | ; Nothing
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| 301 | ; Corrupts registers:
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| 302 | ; AX, CX
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| 303 | ;--------------------------------------------------------------------
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| 304 | %ifdef MODULE_8BIT_IDE
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| 305 |
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| 306 | ALIGN JUMP_ALIGN
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| 307 | WriteBlockToXtideRev1:
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| 308 | push ds
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| 309 | push bx
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| 310 | UNROLL_SECTORS_IN_CX_TO_QWORDS
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| 311 | mov bl, 8 ; Bit mask for toggling data low/high reg
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| 312 | push es ; Copy ES...
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| 313 | pop ds ; ...to DS
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| 314 | ALIGN JUMP_ALIGN
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| 315 | .OutswLoop:
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| 316 | XTIDE_OUTSW
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| 317 | XTIDE_OUTSW
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| 318 | XTIDE_OUTSW
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| 319 | XTIDE_OUTSW
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| 320 | loop .OutswLoop
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| 321 | pop bx
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| 322 | pop ds
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| 323 | ret
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| 324 |
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| 325 | ;--------------------------------------------------------------------
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| 326 | ALIGN JUMP_ALIGN
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| 327 | WriteBlockToXtideRev2:
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| 328 | UNROLL_SECTORS_IN_CX_TO_QWORDS
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| 329 | push ds
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| 330 | push es ; Copy ES...
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| 331 | pop ds ; ...to DS
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| 332 | ALIGN JUMP_ALIGN
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| 333 | .WriteNextQword:
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| 334 | XTIDE_MOD_OUTSW
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| 335 | XTIDE_MOD_OUTSW
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| 336 | XTIDE_MOD_OUTSW
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| 337 | XTIDE_MOD_OUTSW
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| 338 | loop .WriteNextQword
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| 339 | pop ds
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| 340 | ret
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| 341 |
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| 342 | ;--------------------------------------------------------------------
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| 343 | %ifndef USE_186 ; 8086/8088 compatible WORD write
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| 344 | ALIGN JUMP_ALIGN
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| 345 | WriteBlockToFastXtide:
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| 346 | UNROLL_SECTORS_IN_CX_TO_QWORDS
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| 347 | push ds
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| 348 | push es
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| 349 | pop ds
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| 350 | ALIGN JUMP_ALIGN
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| 351 | .ReadNextQword:
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| 352 | lodsw ; Load 1st WORD from [DS:SI]
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| 353 | out dx, ax ; Write 1st WORD
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| 354 | lodsw
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| 355 | out dx, ax ; 2nd
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| 356 | lodsw
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| 357 | out dx, ax ; 3rd
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| 358 | lodsw
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| 359 | out dx, ax ; 4th
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| 360 | loop .ReadNextQword
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| 361 | pop ds
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| 362 | ret
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| 363 | %endif
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| 364 |
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| 365 | %endif ; MODULE_8BIT_IDE
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| 366 |
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| 367 | ;--------------------------------------------------------------------
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| 368 | ALIGN JUMP_ALIGN
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| 369 | WriteBlockTo16bitDataPort:
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| 370 | xchg cl, ch ; Sectors to WORDs
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| 371 | es ; Source is ES segment
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| 372 | rep
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| 373 | db 6Fh ; OUTSW (we want this in XT build)
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| 374 | ret
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| 375 |
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| 376 | ;--------------------------------------------------------------------
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| 377 | ALIGN JUMP_ALIGN
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| 378 | WriteBlockTo32bitDataPort:
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| 379 | db 0C1h ; SHL
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| 380 | db 0E1h ; CX
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| 381 | db 7 ; 7 (Sectors to DWORDs)
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| 382 | es ; Source is ES segment
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| 383 | rep
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| 384 | db 66h ; Override operand size to 32-bit
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| 385 | db 6Fh ; OUTSW/OUTSD
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| 386 | ret
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| 387 |
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| 388 |
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| 389 |
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| 390 | ; Lookup tables to get transfer function based on bus type
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| 391 | ALIGN WORD_ALIGN
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| 392 | g_rgfnPioRead:
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| 393 | %ifdef MODULE_8BIT_IDE
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| 394 | dw ReadBlockFromXtideRev1 ; DEVICE_XTIDE_REV1
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| 395 | %ifdef USE_186
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| 396 | dw ReadBlockFrom16bitDataPort ; DEVICE_XTIDE_REV2
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| 397 | dw ReadBlockFrom16bitDataPort ; DEVICE_FAST_XTIDE
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| 398 | %else
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| 399 | dw ReadBlockFromXtideRev2 ; DEVICE_XTIDE_REV2
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| 400 | dw ReadBlockFromXtideRev2 ; DEVICE_FAST_XTIDE
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| 401 | %endif
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| 402 |
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| 403 | %else
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| 404 | times COUNT_OF_8BIT_IDE_DEVICES dw 0
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| 405 | %endif
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| 406 | dw ReadBlockFrom16bitDataPort ; DEVICE_16BIT_ATA
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| 407 | dw ReadBlockFrom32bitDataPort ; DEVICE_32BIT_ATA
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| 408 |
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| 409 |
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| 410 | g_rgfnPioWrite:
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| 411 | %ifdef MODULE_8BIT_IDE
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| 412 | dw WriteBlockToXtideRev1 ; DEVICE_XTIDE_REV1
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| 413 | dw WriteBlockToXtideRev2 ; DEVICE_XTIDE_REV2
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| 414 | %ifdef USE_186
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| 415 | dw WriteBlockTo16bitDataPort ; DEVICE_FAST_XTIDE
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| 416 | %else
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| 417 | dw WriteBlockToFastXtide ; DEVICE_FAST_XTIDE
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| 418 | %endif
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| 419 |
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| 420 | %else
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| 421 | times COUNT_OF_8BIT_IDE_DEVICES dw 0
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| 422 | %endif
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| 423 | dw WriteBlockTo16bitDataPort ; DEVICE_16BIT_ATA
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| 424 | dw WriteBlockTo32bitDataPort ; DEVICE_32BIT_ATA
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