| 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, 2011-2013 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 MEMPIOVARS ; Must not be larger than 9 bytes! See IDEPACK in RamVars.inc.
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| 23 | .wSectorsInBlock resb 2 ; 0-1, Block size in sectors
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| 24 | .fpDPT resb 4 ; 2-5, Far pointer to DPT
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| 25 | .bSectorsLeft resb 1 ; 6, Sectors left to transfer
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| 26 | resb 1 ; 7, IDEPACK.bDeviceControl
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| 27 | .bSectorsDone resb 1 ; 8, Number of sectors xferred
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| 28 | endstruc
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| 29 |
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| 30 |
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| 31 | ; Section containing code
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| 32 | SECTION .text
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| 33 |
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| 34 | ;--------------------------------------------------------------------
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| 35 | ; JrIdeTransfer_StartWithCommandInAL
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| 36 | ; Parameters:
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| 37 | ; AL: IDE command that was used to start the transfer
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| 38 | ; (all PIO read and write commands including Identify Device)
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| 39 | ; ES:SI: Ptr to data buffer
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| 40 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 41 | ; SS:BP: Ptr to IDEPACK
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| 42 | ; Returns:
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| 43 | ; AH: INT 13h Error Code
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| 44 | ; CX: Number of successfully transferred sectors
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| 45 | ; CF: Cleared if success, Set if error
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| 46 | ; Corrupts registers:
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| 47 | ; AL, BX, DX, SI, ES
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| 48 | ;--------------------------------------------------------------------
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| 49 | ALIGN JUMP_ALIGN
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| 50 | JrIdeTransfer_StartWithCommandInAL:
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| 51 | ; Initialize MEMPIOVARS
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| 52 | xchg cx, ax ; IDE command to CL
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| 53 | xor ax, ax
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| 54 | mov [bp+MEMPIOVARS.bSectorsDone], al
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| 55 | mov dh, [bp+IDEPACK.bSectorCount]
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| 56 | mov [bp+MEMPIOVARS.bSectorsLeft], dh
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| 57 | mov al, [di+DPT_ATA.bBlockSize]
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| 58 | mov [bp+MEMPIOVARS.wSectorsInBlock], ax
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| 59 | mov [bp+MEMPIOVARS.fpDPT], di
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| 60 | mov [bp+MEMPIOVARS.fpDPT+2], ds
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| 61 |
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| 62 | ; Normalize pointer
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| 63 | call IdeTransfer_NormalizePointerInESSI
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| 64 | %ifdef USE_AT
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| 65 | jc SHORT ReturnWithMemoryIOtransferErrorInAH
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| 66 | %endif
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| 67 |
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| 68 | ; Get far pointer to Sector Access Window
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| 69 | cmp BYTE [di+DPT_ATA.bDevice], DEVICE_8BIT_JRIDE_ISA
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| 70 | mov ds, [di+DPT.wBasePort] ; Segment for JR-IDE/ISA and ADP50L
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| 71 | mov di, ADP50L_SECTOR_ACCESS_WINDOW_OFFSET
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| 72 | eCMOVE di, JRIDE_SECTOR_ACCESS_WINDOW_OFFSET
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| 73 |
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| 74 | ; Are we reading or writing?
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| 75 | .SectorAccessWindowLoadedToDSDI:
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| 76 | test cl, 16 ; Bit 4 is cleared on all the read commands but set on 3 of the 4 write commands
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| 77 | jnz SHORT WriteToSectorAccessWindow
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| 78 | cmp cl, COMMAND_WRITE_MULTIPLE
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| 79 | je SHORT WriteToSectorAccessWindow
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| 80 | ; Fall to ReadFromSectorAccessWindow
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| 81 |
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| 82 | ;--------------------------------------------------------------------
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| 83 | ; ReadFromSectorAccessWindow
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| 84 | ; Parameters:
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| 85 | ; DS:DI: Ptr to Sector Access Window
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| 86 | ; ES:SI: Normalized ptr to buffer to receive data
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| 87 | ; SS:BP: Ptr to MEMPIOVARS
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| 88 | ; Returns:
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| 89 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 90 | ; AH: BIOS Error code
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| 91 | ; CX: Number of successfully transferred sectors
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| 92 | ; CF: 0 if transfer successful
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| 93 | ; 1 if any error
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| 94 | ; Corrupts registers:
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| 95 | ; AL, BX, DX, SI
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| 96 | ;--------------------------------------------------------------------
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| 97 | ReadFromSectorAccessWindow:
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| 98 | xchg si, di ; DS:SI = source, ES:DI = Destination
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| 99 | call WaitUntilReadyToTransferNextBlock
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| 100 | jc SHORT ReturnWithMemoryIOtransferErrorInAH
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| 101 |
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| 102 | mov cx, [bp+MEMPIOVARS.wSectorsInBlock] ; Clears CH
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| 103 | cmp [bp+MEMPIOVARS.bSectorsLeft], cl
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| 104 | jbe SHORT .ReadLastBlockFromDrive
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| 105 |
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| 106 | ALIGN JUMP_ALIGN
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| 107 | .ReadNextBlockFromDrive:
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| 108 | call ReadSingleBlockFromSectorAccessWindowInDSSItoESDI
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| 109 | call WaitUntilReadyToTransferNextBlock
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| 110 | jc SHORT ReturnWithMemoryIOtransferErrorInAH
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| 111 |
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| 112 | ; Update number of successfully read sectors and sectors left to transfer.
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| 113 | ; We cannot use SUB instruction as a comparison since it will not
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| 114 | ; work in this situation:
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| 115 | ; Before SUB we have 2 full blocks left to transfer. SUB command
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| 116 | ; then compares 2 full blocks against one full block and updates
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| 117 | ; sectors left to one full block and jumps to .ReadNextBlockFromDrive,
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| 118 | ; since we have one full block left to transfer. After it has been
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| 119 | ; transferred, there will be a wait for next block but DRQ is never
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| 120 | ; set since all is transferred! Then we get timeout error.
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| 121 | mov cx, [bp+MEMPIOVARS.wSectorsInBlock]
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| 122 | sub [bp+MEMPIOVARS.bSectorsLeft], cl
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| 123 | add [bp+MEMPIOVARS.bSectorsDone], cl
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| 124 | cmp [bp+MEMPIOVARS.bSectorsLeft], cl
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| 125 | ja SHORT .ReadNextBlockFromDrive
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| 126 |
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| 127 | ALIGN JUMP_ALIGN
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| 128 | .ReadLastBlockFromDrive:
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| 129 | mov cl, [bp+MEMPIOVARS.bSectorsLeft]
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| 130 | push cx
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| 131 | call ReadSingleBlockFromSectorAccessWindowInDSSItoESDI
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| 132 |
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| 133 | ; Check for errors in last block
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| 134 | CheckErrorsAfterTransferringLastMemoryMappedBlock:
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| 135 | lds di, [bp+MEMPIOVARS.fpDPT] ; DPT now in DS:DI
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| 136 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_BSY)
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| 137 | call IdeWait_PollStatusFlagInBLwithTimeoutInBH
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| 138 | pop cx ; [bp+MEMPIOVARS.bSectorsLeft]
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| 139 | jc SHORT ReturnWithMemoryIOtransferErrorInAH
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| 140 |
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| 141 | ; All sectors successfully transferred
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| 142 | add cl, [bp+MEMPIOVARS.bSectorsDone] ; Never sets CF
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| 143 | ret
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| 144 |
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| 145 | ; Return number of successfully transferred sectors
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| 146 | ReturnWithMemoryIOtransferErrorInAH:
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| 147 | lds di, [bp+MEMPIOVARS.fpDPT] ; DPT now in DS:DI
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| 148 | %ifdef USE_386
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| 149 | movzx cx, BYTE [bp+MEMPIOVARS.bSectorsDone]
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| 150 | %else
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| 151 | mov ch, 0 ; Preserve CF
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| 152 | mov cl, [bp+MEMPIOVARS.bSectorsDone]
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| 153 | %endif
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| 154 | ret
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| 155 |
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| 156 |
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| 157 | ;--------------------------------------------------------------------
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| 158 | ; WriteToSectorAccessWindow
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| 159 | ; Parameters:
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| 160 | ; DS:DI: Ptr to Sector Access Window
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| 161 | ; ES:SI: Normalized ptr to buffer containing data
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| 162 | ; SS:BP: Ptr to MEMPIOVARS
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| 163 | ; Returns:
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| 164 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 165 | ; AH: BIOS Error code
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| 166 | ; CX: Number of successfully transferred sectors
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| 167 | ; CF: 0 if transfer successful
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| 168 | ; 1 if any error
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| 169 | ; Corrupts registers:
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| 170 | ; AL, BX, DX, SI, ES
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| 171 | ;--------------------------------------------------------------------
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| 172 | ALIGN JUMP_ALIGN
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| 173 | WriteToSectorAccessWindow:
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| 174 | push es
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| 175 | push ds
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| 176 | pop es ; ES:DI = Sector Access Window (destination)
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| 177 | pop ds ; DS:SI = Ptr to source buffer
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| 178 |
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| 179 | ; Always poll when writing first block (IRQs are generated for following blocks)
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| 180 | call WaitUntilReadyToTransferNextBlock
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| 181 | jc SHORT ReturnWithMemoryIOtransferErrorInAH
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| 182 |
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| 183 | mov cx, [bp+MEMPIOVARS.wSectorsInBlock]
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| 184 | cmp [bp+MEMPIOVARS.bSectorsLeft], cl
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| 185 | jbe SHORT .WriteLastBlockToDrive
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| 186 |
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| 187 | ALIGN JUMP_ALIGN
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| 188 | .WriteNextBlockToDrive:
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| 189 | call WriteSingleBlockFromDSSIToSectorAccessWindowInESDI
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| 190 | call WaitUntilReadyToTransferNextBlock
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| 191 | jc SHORT ReturnWithMemoryIOtransferErrorInAH
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| 192 |
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| 193 | ; Increment number of successfully written WORDs
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| 194 | mov cx, [bp+MEMPIOVARS.wSectorsInBlock]
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| 195 | sub [bp+MEMPIOVARS.bSectorsLeft], cl
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| 196 | add [bp+MEMPIOVARS.bSectorsDone], cl
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| 197 | cmp [bp+MEMPIOVARS.bSectorsLeft], cl
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| 198 | ja SHORT .WriteNextBlockToDrive
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| 199 |
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| 200 | ALIGN JUMP_ALIGN
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| 201 | .WriteLastBlockToDrive:
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| 202 | mov cl, [bp+MEMPIOVARS.bSectorsLeft]
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| 203 | push cx
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| 204 | ePUSH_T bx, CheckErrorsAfterTransferringLastMemoryMappedBlock
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| 205 | ; Fall to WriteSingleBlockFromDSSIToSectorAccessWindowInESDI
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| 206 |
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| 207 | ;--------------------------------------------------------------------
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| 208 | ; WriteSingleBlockFromDSSIToSectorAccessWindowInESDI
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| 209 | ; Parameters:
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| 210 | ; CX: Number of sectors in block
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| 211 | ; DS:SI: Normalized ptr to source buffer
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| 212 | ; ES:DI: Ptr to Sector Access Window
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| 213 | ; Returns:
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| 214 | ; CX, DX: Zero
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| 215 | ; SI: Updated
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| 216 | ; Corrupts registers:
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| 217 | ; BX
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| 218 | ;--------------------------------------------------------------------
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| 219 | ALIGN JUMP_ALIGN
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| 220 | WriteSingleBlockFromDSSIToSectorAccessWindowInESDI:
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| 221 | mov bx, di
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| 222 | mov dx, cx
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| 223 | xor cx, cx
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| 224 | ALIGN JUMP_ALIGN
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| 225 | .WriteNextSector:
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| 226 | inc ch
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| 227 | rep movsw
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| 228 | mov di, bx ; Reset for next sector
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| 229 | dec dx
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| 230 | jnz SHORT .WriteNextSector
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| 231 | ret
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| 232 |
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| 233 |
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| 234 | ;--------------------------------------------------------------------
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| 235 | ; ReadSingleBlockFromSectorAccessWindowInDSSItoESDI
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| 236 | ; Parameters:
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| 237 | ; CX Number of sectors in full block or sectors in last partial block
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| 238 | ; ES:DI: Normalized ptr to buffer to receive data (destination)
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| 239 | ; DS:SI: Ptr to Sector Access Window (source)
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| 240 | ; Returns:
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| 241 | ; CX, DX: Zero
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| 242 | ; DI: Updated
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| 243 | ; Corrupts registers:
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| 244 | ; BX
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| 245 | ;--------------------------------------------------------------------
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| 246 | ALIGN JUMP_ALIGN
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| 247 | ReadSingleBlockFromSectorAccessWindowInDSSItoESDI:
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| 248 | mov bx, si
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| 249 | mov dx, cx
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| 250 | xor cx, cx
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| 251 | ALIGN JUMP_ALIGN
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| 252 | .ReadNextSector:
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| 253 | inc ch
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| 254 | rep movsw
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| 255 | mov si, bx ; Reset for next sector
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| 256 | dec dx
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| 257 | jnz SHORT .ReadNextSector
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| 258 | ret
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| 259 |
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| 260 |
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| 261 | ;--------------------------------------------------------------------
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| 262 | ; WaitUntilReadyToTransferNextBlock
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| 263 | ; Parameters:
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| 264 | ; SS:BP: Ptr to MEMPIOVARS
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| 265 | ; Returns:
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| 266 | ; AH: INT 13h Error Code
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| 267 | ; CF: Cleared if success, Set if error
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| 268 | ; Corrupts registers:
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| 269 | ; AL, BX, CX, DX
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| 270 | ;--------------------------------------------------------------------
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| 271 | ALIGN JUMP_ALIGN
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| 272 | WaitUntilReadyToTransferNextBlock:
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| 273 | push ds
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| 274 | push di
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| 275 | lds di, [bp+MEMPIOVARS.fpDPT] ; DPT now in DS:DI
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| 276 | call IdeWait_IRQorDRQ ; Always polls
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| 277 | pop di
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| 278 | pop ds
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| 279 | ret
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| 280 |
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