| 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 | ; Structure containing variables for PIO transfer functions.
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| 5 | ; This struct must not be larger than IDEPACK without INTPACK.
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| 6 | struc MEMPIOVARS
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| 7 | .wWordsInBlock resb 2 ; 0, Block size in WORDs
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| 8 | .wWordsLeft resb 2 ; 2, WORDs left to transfer
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| 9 | .wWordsDone resb 2 ; 4, Number of sectors xferred
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| 10 | ; TODO: The above word vars could just as well be byte vars?
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| 11 | resb 1 ; 6,
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| 12 | resb 1 ; 7, IDEPACK.bDeviceControl
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| 13 | .fpDPT resb 4 ; 8, Far pointer to DPT
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| 14 | endstruc
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| 15 |
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| 16 |
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| 17 | ; Section containing code
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| 18 | SECTION .text
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| 19 |
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| 20 | ;--------------------------------------------------------------------
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| 21 | ; MemIdeTransfer_StartWithCommandInAL
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| 22 | ; Parameters:
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| 23 | ; AL: IDE command that was used to start the transfer
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| 24 | ; (all PIO read and write commands including Identify Device)
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| 25 | ; ES:SI: Ptr to normalized data buffer
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| 26 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 27 | ; SS:BP: Ptr to IDEPACK
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| 28 | ; Returns:
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| 29 | ; AH: INT 13h Error Code
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| 30 | ; CX: Number of successfully transferred sectors
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| 31 | ; CF: Cleared if success, Set if error
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| 32 | ; Corrupts registers:
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| 33 | ; AL, BX, DX, SI, ES
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| 34 | ;--------------------------------------------------------------------
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| 35 | ALIGN JUMP_ALIGN
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| 36 | MemIdeTransfer_StartWithCommandInAL:
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| 37 | push cs ; We push CS here (segment of SAW) and later pop it to DS (reads) or ES (writes)
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| 38 |
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| 39 | ; Initialize MEMPIOVARS
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| 40 | xor cx, cx
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| 41 | mov [bp+MEMPIOVARS.wWordsDone], cx
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| 42 | mov ch, [bp+IDEPACK.bSectorCount]
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| 43 | mov [bp+MEMPIOVARS.wWordsLeft], cx
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| 44 | mov ch, [di+DPT_ATA.bSetBlock]
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| 45 | mov [bp+MEMPIOVARS.wWordsInBlock], cx
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| 46 | mov [bp+MEMPIOVARS.fpDPT], di
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| 47 | mov [bp+MEMPIOVARS.fpDPT+2], ds
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| 48 |
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| 49 | ; Are we reading or writing?
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| 50 | 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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| 51 | jnz SHORT WriteToSectorAccessWindow
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| 52 | cmp al, COMMAND_WRITE_MULTIPLE
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| 53 | je SHORT WriteToSectorAccessWindow
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| 54 | ; Fall to ReadFromSectorAccessWindow
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| 55 |
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| 56 | ;--------------------------------------------------------------------
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| 57 | ; ReadFromSectorAccessWindow
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| 58 | ; Parameters:
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| 59 | ; Stack: Segment part of ptr to Sector Access Window
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| 60 | ; ES:SI: Normalized ptr to buffer to receive data
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| 61 | ; SS:BP: Ptr to MEMPIOVARS
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| 62 | ; Returns:
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| 63 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 64 | ; AH: BIOS Error code
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| 65 | ; CX: Number of successfully transferred sectors
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| 66 | ; CF: 0 if transfer successful
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| 67 | ; 1 if any error
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| 68 | ; Corrupts registers:
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| 69 | ; AL, BX, DX, SI, ES
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| 70 | ;--------------------------------------------------------------------
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| 71 | ReadFromSectorAccessWindow:
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| 72 | pop ds ; CS -> DS
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| 73 | mov di, si ; ES:DI = destination
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| 74 | mov si, JRIDE_SECTOR_ACCESS_WINDOW_OFFSET ; DS:SI = source
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| 75 |
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| 76 | call WaitUntilReadyToTransferNextBlock
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| 77 | jc SHORT ReturnWithMemoryIOtransferErrorInAH
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| 78 |
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| 79 | mov cx, [bp+MEMPIOVARS.wWordsInBlock]
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| 80 |
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| 81 | ALIGN JUMP_ALIGN
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| 82 | .ReadNextBlockFromDrive:
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| 83 | cmp [bp+MEMPIOVARS.wWordsLeft], cx
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| 84 | jbe SHORT .ReadLastBlockFromDrive
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| 85 | call ReadSingleBlockFromSectorAccessWindowInDSSItoESDI
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| 86 | call WaitUntilReadyToTransferNextBlock
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| 87 | jc SHORT ReturnWithMemoryIOtransferErrorInAH
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| 88 |
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| 89 | ; Increment number of successfully read WORDs
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| 90 | mov cx, [bp+MEMPIOVARS.wWordsInBlock]
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| 91 | sub [bp+MEMPIOVARS.wWordsLeft], cx
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| 92 | add [bp+MEMPIOVARS.wWordsDone], cx
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| 93 | jmp SHORT .ReadNextBlockFromDrive
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| 94 |
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| 95 | ALIGN JUMP_ALIGN
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| 96 | .ReadLastBlockFromDrive:
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| 97 | mov ch, [bp+MEMPIOVARS.wWordsLeft+1] ; Sectors left
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| 98 | call ReadSingleBlockFromSectorAccessWindowInDSSItoESDI
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| 99 |
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| 100 | ; Check for errors in last block
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| 101 | CheckErrorsAfterTransferringLastMemoryMappedBlock:
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| 102 | lds di, [bp+MEMPIOVARS.fpDPT] ; DPT now in DS:DI
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| 103 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRDY)
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| 104 | call IDEDEVICE%+Wait_PollStatusFlagInBLwithTimeoutInBH
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| 105 |
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| 106 | ; Return number of successfully transferred sectors
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| 107 | ReturnWithMemoryIOtransferErrorInAH:
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| 108 | lds di, [bp+MEMPIOVARS.fpDPT] ; DPT now in DS:DI
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| 109 | mov cx, [bp+MEMPIOVARS.wWordsDone]
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| 110 | jc SHORT .ConvertTransferredWordsInCXtoSectors
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| 111 | add cx, [bp+MEMPIOVARS.wWordsLeft] ; Never sets CF
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| 112 | .ConvertTransferredWordsInCXtoSectors:
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| 113 | xchg cl, ch
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| 114 | ret
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| 115 |
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| 116 |
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| 117 | ;--------------------------------------------------------------------
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| 118 | ; WriteToSectorAccessWindow
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| 119 | ; Parameters:
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| 120 | ; Stack: Segment part of ptr to Sector Access Window
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| 121 | ; ES:SI: Normalized ptr to buffer containing data
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| 122 | ; SS:BP: Ptr to MEMPIOVARS
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| 123 | ; Returns:
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| 124 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 125 | ; AH: BIOS Error code
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| 126 | ; CX: Number of successfully transferred sectors
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| 127 | ; CF: 0 if transfer successful
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| 128 | ; 1 if any error
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| 129 | ; Corrupts registers:
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| 130 | ; AL, BX, DX, SI, ES
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| 131 | ;--------------------------------------------------------------------
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| 132 | ALIGN JUMP_ALIGN
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| 133 | WriteToSectorAccessWindow:
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| 134 | push es
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| 135 | pop ds
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| 136 | pop es ; CS -> ES
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| 137 | mov di, JRIDE_SECTOR_ACCESS_WINDOW_OFFSET
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| 138 |
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| 139 | ; Always poll when writing first block (IRQs are generated for following blocks)
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| 140 | call WaitUntilReadyToTransferNextBlock
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| 141 | jc SHORT ReturnWithMemoryIOtransferErrorInAH
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| 142 |
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| 143 | mov cx, [bp+MEMPIOVARS.wWordsInBlock]
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| 144 |
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| 145 | ALIGN JUMP_ALIGN
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| 146 | .WriteNextBlockToDrive:
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| 147 | cmp [bp+MEMPIOVARS.wWordsLeft], cx
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| 148 | jbe SHORT .WriteLastBlockToDrive
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| 149 | call WriteSingleBlockFromDSSIToSectorAccessWindowInESDI
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| 150 | call WaitUntilReadyToTransferNextBlock
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| 151 | jc SHORT ReturnWithMemoryIOtransferErrorInAH
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| 152 |
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| 153 | ; Increment number of successfully written WORDs
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| 154 | mov cx, [bp+MEMPIOVARS.wWordsInBlock]
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| 155 | sub [bp+MEMPIOVARS.wWordsLeft], cx
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| 156 | add [bp+MEMPIOVARS.wWordsDone], cx
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| 157 | jmp SHORT .WriteNextBlockToDrive
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| 158 |
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| 159 | ALIGN JUMP_ALIGN
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| 160 | .WriteLastBlockToDrive:
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| 161 | mov ch, [bp+MEMPIOVARS.wWordsLeft+1] ; Sectors left
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| 162 | ePUSH_T bx, CheckErrorsAfterTransferringLastMemoryMappedBlock
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| 163 | ; Fall to WriteSingleBlockFromDSSIToSectorAccessWindowInESDI
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| 164 |
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| 165 | ;--------------------------------------------------------------------
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| 166 | ; WriteSingleBlockFromDSSIToSectorAccessWindowInESDI
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| 167 | ; Parameters:
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| 168 | ; CH: Number of sectors in block
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| 169 | ; DS:SI: Normalized ptr to source buffer
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| 170 | ; ES:DI: Ptr to Sector Access Window
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| 171 | ; Returns:
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| 172 | ; CX, DX: Zero
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| 173 | ; SI: Updated
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| 174 | ; Corrupts registers:
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| 175 | ; BX
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| 176 | ;--------------------------------------------------------------------
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| 177 | ALIGN JUMP_ALIGN
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| 178 | WriteSingleBlockFromDSSIToSectorAccessWindowInESDI:
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| 179 | mov bx, di
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| 180 | eMOVZX dx, ch
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| 181 | xor cl, cl
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| 182 | ALIGN JUMP_ALIGN
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| 183 | .WriteBlock:
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| 184 | mov ch, JRIDE_SECTOR_ACCESS_WINDOW_SIZE >> 9
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| 185 | rep movsw
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| 186 | mov di, bx ; Reset for next sector
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| 187 | dec dx
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| 188 | jnz SHORT .WriteBlock
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| 189 | ret
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| 190 |
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| 191 |
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| 192 | ;--------------------------------------------------------------------
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| 193 | ; ReadSingleBlockFromSectorAccessWindowInDSSItoESDI
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| 194 | ; Parameters:
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| 195 | ; CH: Number of sectors in block
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| 196 | ; ES:DI: Normalized ptr to buffer to receive data (destination)
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| 197 | ; DS:SI: Ptr to Sector Access Window (source)
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| 198 | ; Returns:
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| 199 | ; CX, DX: Zero
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| 200 | ; DI: Updated
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| 201 | ; Corrupts registers:
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| 202 | ; BX
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| 203 | ;--------------------------------------------------------------------
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| 204 | ALIGN JUMP_ALIGN
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| 205 | ReadSingleBlockFromSectorAccessWindowInDSSItoESDI:
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| 206 | mov bx, si
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| 207 | eMOVZX dx, ch
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| 208 | xor cl, cl
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| 209 | ALIGN JUMP_ALIGN
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| 210 | .ReadBlock:
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| 211 | mov ch, JRIDE_SECTOR_ACCESS_WINDOW_SIZE >> 9
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| 212 | rep movsw
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| 213 | mov si, bx ; Reset for next sector
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| 214 | dec dx
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| 215 | jnz SHORT .ReadBlock
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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 | ; WaitUntilReadyToTransferNextBlock
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| 221 | ; Parameters:
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| 222 | ; SS:BP: Ptr to MEMPIOVARS
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| 223 | ; Returns:
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| 224 | ; AH: INT 13h Error Code
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| 225 | ; CF: Cleared if success, Set if error
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| 226 | ; Corrupts registers:
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| 227 | ; AL, BX, CX, DX
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| 228 | ;--------------------------------------------------------------------
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| 229 | ALIGN JUMP_ALIGN
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| 230 | WaitUntilReadyToTransferNextBlock:
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| 231 | push ds
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| 232 | push di
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| 233 | lds di, [bp+MEMPIOVARS.fpDPT] ; DPT now in DS:DI
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| 234 | call IDEDEVICE%+Wait_IRQorDRQ ; Always polls
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| 235 | pop di
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| 236 | pop ds
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| 237 | ret
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| 238 |
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| 239 |
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| 240 | %if JRIDE_SECTOR_ACCESS_WINDOW_SIZE <> 512
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| 241 | %error "JRIDE_SECTOR_ACCESS_WINDOW_SIZE is no longer equal to 512. MemIdeTransfer.asm needs changes."
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| 242 | %endif
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| 243 |
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