| 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 | ; 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 PIOVARS
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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 | resb 1 ; 6,
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| 11 | resb 1 ; 7, IDEPACK.bDeviceControl
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| 12 | .wDataPort resb 2 ; 8, IDE Data Port
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| 13 | .fnXfer resb 2 ; 10, Offset to transfer function
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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 | ; IdeTransfer_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 | IdeTransfer_StartWithCommandInAL:
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| 37 | ; Are we reading or writing?
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| 38 | 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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| 39 | mov ah, [bp+IDEPACK.bSectorCount]
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| 40 | jnz SHORT WriteToDrive
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| 41 | cmp al, COMMAND_WRITE_MULTIPLE
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| 42 | je SHORT WriteToDrive
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| 43 | ; Fall to ReadFromDrive
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| 44 |
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| 45 | ;--------------------------------------------------------------------
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| 46 | ; ReadFromDrive
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| 47 | ; Parameters:
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| 48 | ; AH: Number of sectors to transfer (1...128)
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| 49 | ; ES:SI: Normalized ptr to buffer to receive data
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| 50 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 51 | ; SS:BP: Ptr to PIOVARS
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| 52 | ; Returns:
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| 53 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 54 | ; AH: BIOS Error code
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| 55 | ; CX: Number of successfully transferred sectors
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| 56 | ; CF: 0 if transfer succesfull
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| 57 | ; 1 if any error
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| 58 | ; Corrupts registers:
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| 59 | ; AL, BX, DX, SI, ES
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| 60 | ;--------------------------------------------------------------------
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| 61 | ReadFromDrive:
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| 62 | ; Prepare to read data to ESSI
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| 63 | mov bx, g_rgfnPioRead
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| 64 | call InitializePiovarsInSSBPwithSectorCountInAH
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| 65 |
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| 66 | ; Wait until drive is ready to transfer
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| 67 | call IdeWait_IRQorDRQ ; Wait until ready to transfer
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| 68 | jc SHORT ReturnWithTransferErrorInAH
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| 69 | xchg si, di ; ES:DI now points buffer
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| 70 |
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| 71 | mov cx, [bp+PIOVARS.wWordsInBlock]
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| 72 |
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| 73 | ALIGN JUMP_ALIGN
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| 74 | .ReadNextBlockFromDrive:
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| 75 | mov dx, [bp+PIOVARS.wDataPort]
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| 76 | cmp [bp+PIOVARS.wWordsLeft], cx
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| 77 | jbe SHORT .ReadLastBlockFromDrive
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| 78 | call [bp+PIOVARS.fnXfer]
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| 79 |
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| 80 | ; Wait until ready for next block and check for errors
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| 81 | xchg di, si ; DS:DI now points DPT
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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 | ; Increment number of successfully read WORDs
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| 87 | mov cx, [bp+PIOVARS.wWordsInBlock]
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| 88 | sub [bp+PIOVARS.wWordsLeft], cx
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| 89 | add [bp+PIOVARS.wWordsDone], cx
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| 90 | jmp SHORT .ReadNextBlockFromDrive
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| 91 |
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| 92 | ALIGN JUMP_ALIGN
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| 93 | .ReadLastBlockFromDrive:
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| 94 | mov cx, [bp+PIOVARS.wWordsLeft]
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| 95 | call [bp+PIOVARS.fnXfer] ; Transfer possibly partial block
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| 96 |
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| 97 | ; Check for errors in last block
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| 98 | mov di, si ; DS:DI now points DPT
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| 99 | CheckErrorsAfterTransferringLastBlock:
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| 100 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRDY)
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| 101 | call IdeWait_PollStatusFlagInBLwithTimeoutInBH
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| 102 |
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| 103 | ; Return number of successfully read sectors
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| 104 | ReturnWithTransferErrorInAH:
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| 105 | mov cx, [bp+PIOVARS.wWordsDone]
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| 106 | jc SHORT .ConvertTransferredWordsInCXtoSectors
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| 107 | add cx, [bp+PIOVARS.wWordsLeft] ; Never sets CF
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| 108 | .ConvertTransferredWordsInCXtoSectors:
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| 109 | xchg cl, ch
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| 110 | ret
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| 111 |
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| 112 |
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| 113 | ;--------------------------------------------------------------------
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| 114 | ; WriteToDrive
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| 115 | ; Parameters:
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| 116 | ; AH: Number of sectors to transfer (1...128)
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| 117 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 118 | ; ES:SI: Normalized ptr to buffer containing data
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| 119 | ; SS:BP: Ptr to PIOVARS
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| 120 | ; Returns:
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| 121 | ; AH: BIOS Error code
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| 122 | ; CX: Number of successfully transferred sectors
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| 123 | ; CF: 0 if transfer succesfull
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| 124 | ; 1 if any error
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| 125 | ; Corrupts registers:
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| 126 | ; AL, BX, DX, SI, ES
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| 127 | ;--------------------------------------------------------------------
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| 128 | ALIGN JUMP_ALIGN
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| 129 | WriteToDrive:
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| 130 | ; Prepare to write data from ESSI
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| 131 | mov bx, g_rgfnPioWrite
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| 132 | call InitializePiovarsInSSBPwithSectorCountInAH
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| 133 |
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| 134 | ; Always poll when writing first block (IRQs are generated for following blocks)
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| 135 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRQ)
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| 136 | call IdeWait_PollStatusFlagInBLwithTimeoutInBH
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| 137 | jc SHORT ReturnWithTransferErrorInAH
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| 138 |
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| 139 | mov cx, [bp+PIOVARS.wWordsInBlock]
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| 140 |
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| 141 | ALIGN JUMP_ALIGN
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| 142 | .WriteNextBlockToDrive:
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| 143 | mov dx, [bp+PIOVARS.wDataPort]
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| 144 | cmp [bp+PIOVARS.wWordsLeft], cx
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| 145 | jbe SHORT .WriteLastBlockToDrive
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| 146 | call [bp+PIOVARS.fnXfer]
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| 147 |
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| 148 | ; Wait until ready for next block and check for errors
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| 149 | call IdeWait_IRQorDRQ ; Wait until ready to transfer
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| 150 | jc SHORT ReturnWithTransferErrorInAH
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| 151 |
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| 152 | ; Increment number of successfully written WORDs
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| 153 | mov cx, [bp+PIOVARS.wWordsInBlock]
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| 154 | sub [bp+PIOVARS.wWordsLeft], cx
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| 155 | add [bp+PIOVARS.wWordsDone], cx
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| 156 | jmp SHORT .WriteNextBlockToDrive
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| 157 |
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| 158 | ALIGN JUMP_ALIGN
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| 159 | .WriteLastBlockToDrive:
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| 160 | mov cx, [bp+PIOVARS.wWordsLeft]
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| 161 | %ifdef USE_186
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| 162 | push CheckErrorsAfterTransferringLastBlock
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| 163 | jmp [bp+PIOVARS.fnXfer] ; Transfer possibly partial block
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| 164 | %else
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| 165 | call [bp+PIOVARS.fnXfer] ; Transfer possibly partial block
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| 166 | jmp SHORT CheckErrorsAfterTransferringLastBlock
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| 167 | %endif
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| 168 |
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| 169 |
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| 170 | ;--------------------------------------------------------------------
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| 171 | ; InitializePiovarsInSSBPwithSectorCountInAH
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| 172 | ; Parameters:
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| 173 | ; AH: Number of sectors to transfer (1...128)
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| 174 | ; BX: Offset to transfer function lookup table
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| 175 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 176 | ; SS:BP: Ptr to PIOVARS
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| 177 | ; Returns:
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| 178 | ; Nothing
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| 179 | ; Corrupts registers:
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| 180 | ; AX, BX, DX
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| 181 | ;--------------------------------------------------------------------
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| 182 | ALIGN JUMP_ALIGN
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| 183 | InitializePiovarsInSSBPwithSectorCountInAH:
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| 184 | ; Store sizes
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| 185 | xor al, al
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| 186 | mov [bp+PIOVARS.wWordsLeft], ax
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| 187 | mov ah, [di+DPT_ATA.bSetBlock]
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| 188 | mov [bp+PIOVARS.wWordsInBlock], ax
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| 189 | cbw
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| 190 | mov [bp+PIOVARS.wWordsDone], ax ; Zero
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| 191 |
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| 192 | ; Get transfer function based on bus type
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| 193 | xchg ax, bx ; Lookup table offset to AX
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| 194 | mov bl, [di+DPT.bIdevarsOffset] ; CS:BX now points to IDEVARS
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| 195 | mov dx, [cs:bx+IDEVARS.wPort] ; Load IDE Data port address
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| 196 | mov bl, [cs:bx+IDEVARS.bDevice] ; Load device type to BX
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| 197 | add bx, ax
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| 198 | mov [bp+PIOVARS.wDataPort], dx
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| 199 | mov ax, [cs:bx] ; Load offset to transfer function
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| 200 | mov [bp+PIOVARS.fnXfer], ax
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| 201 | ret
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| 202 |
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| 203 |
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| 204 | ;--------------------------------------------------------------------
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| 205 | ; DualByteReadForXtide Dual port 8-bit XTIDE PIO read transfer
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| 206 | ; SingleByteRead Single port 8-bit PIO read transfer
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| 207 | ; WordReadForXTIDEmod 8088/8086 compatible 16-bit IDE PIO read transfer
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| 208 | ; WordReadForXTplusAndAT Normal 16-bit IDE PIO read transfer
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| 209 | ; DWordRead VLB/PCI 32-bit IDE PIO read transfer
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| 210 | ; Parameters:
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| 211 | ; CX: Block size in WORDs
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| 212 | ; DX: IDE Data port address
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| 213 | ; ES:DI: Normalized ptr to buffer to receive data
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| 214 | ; Returns:
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| 215 | ; Nothing
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| 216 | ; Corrupts registers:
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| 217 | ; AX, BX, CX
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| 218 | ;--------------------------------------------------------------------
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| 219 | ALIGN JUMP_ALIGN
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| 220 | DualByteReadForXtide:
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| 221 | eSHR_IM cx, 2 ; Loop unrolling
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| 222 | mov bx, 8 ; Bit mask for toggling data low/high reg
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| 223 | ALIGN JUMP_ALIGN
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| 224 | .InswLoop:
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| 225 | XTIDE_INSW
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| 226 | XTIDE_INSW
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| 227 | XTIDE_INSW
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| 228 | XTIDE_INSW
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| 229 | loop .InswLoop
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| 230 | ret
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| 231 |
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| 232 | ;----
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| 233 | ALIGN JUMP_ALIGN
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| 234 | SingleByteRead:
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| 235 | %ifdef USE_186 ; INS instruction available
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| 236 | shl cx, 1 ; WORD count to BYTE count
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| 237 | dec cx ; Fix for CX overflowing on a 128 sector transfer
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| 238 | insb
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| 239 | rep insb
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| 240 | %else ; If 8088/8086
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| 241 | shr cx, 1 ; WORD count to DWORD count
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| 242 | ALIGN JUMP_ALIGN
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| 243 | .InsdLoop:
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| 244 | in al, dx
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| 245 | stosb ; Store to [ES:DI]
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| 246 | in al, dx
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| 247 | stosb
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| 248 | in al, dx
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| 249 | stosb
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| 250 | in al, dx
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| 251 | stosb
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| 252 | loop .InsdLoop
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| 253 | %endif
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| 254 | ret
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| 255 |
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| 256 | ;----
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| 257 | %ifndef USE_186
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| 258 | ALIGN JUMP_ALIGN
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| 259 | WordReadForXTIDEmod:
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| 260 | times 2 shr cx, 1 ; WORD count to QWORD count
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| 261 | ALIGN JUMP_ALIGN
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| 262 | .ReadNextQword:
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| 263 | in ax, dx ; Read 1st WORD
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| 264 | stosw ; Store 1st WORD to [ES:DI]
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| 265 | in ax, dx
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| 266 | stosw ; 2nd
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| 267 | in ax, dx
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| 268 | stosw ; 3rd
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| 269 | in ax, dx
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| 270 | stosw ; 4th
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| 271 | loop .ReadNextQword
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| 272 | ret
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| 273 | %endif
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| 274 |
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| 275 | ;----
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| 276 | ALIGN JUMP_ALIGN
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| 277 | WordReadForXTplusAndAT:
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| 278 | rep
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| 279 | db 6Dh ; INSW (we want this in XT build)
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| 280 | ret
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| 281 |
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| 282 | ;----
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| 283 | ALIGN JUMP_ALIGN
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| 284 | DWordRead:
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| 285 | shr cx, 1 ; WORD count to DWORD count
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| 286 | rep
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| 287 | db 66h ; Override operand size to 32-bit
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| 288 | db 6Dh ; INSW/INSD
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| 289 | ret
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| 290 |
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| 291 |
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| 292 | ;--------------------------------------------------------------------
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| 293 | ; DualByteWriteForXtide Dual port 8-bit XTIDE PIO write transfer
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| 294 | ; SingleByteWrite Single port 8-bit PIO write transfer
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| 295 | ; WordWriteForXTIDEmod 8088/8086 compatible 16-bit IDE PIO read transfer
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| 296 | ; WordWrite Normal 16-bit IDE PIO write transfer
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| 297 | ; DWordWrite VLB/PCI 32-bit IDE PIO write transfer
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| 298 | ; Parameters:
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| 299 | ; CX: Block size in WORDs
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| 300 | ; DX: IDE Data port address
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| 301 | ; ES:SI: Normalized ptr to buffer containing data
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| 302 | ; Returns:
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| 303 | ; Nothing
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| 304 | ; Corrupts registers:
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| 305 | ; AX, CX
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| 306 | ;--------------------------------------------------------------------
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| 307 | ALIGN JUMP_ALIGN
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| 308 | DualByteWriteForXtide:
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| 309 | push ds
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| 310 | push bx
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| 311 | eSHR_IM cx, 2 ; Loop unrolling
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| 312 | mov bx, 8 ; Bit mask for toggling data low/high reg
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| 313 | push es ; Copy ES...
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| 314 | pop ds ; ...to DS
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| 315 | ALIGN JUMP_ALIGN
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| 316 | .OutswLoop:
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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 | XTIDE_OUTSW
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| 321 | loop .OutswLoop
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| 322 | pop bx
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| 323 | pop ds
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| 324 | ret
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| 325 |
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| 326 | ;----
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| 327 | ALIGN JUMP_ALIGN
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| 328 | SingleByteWrite:
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| 329 | %ifdef USE_186 ; OUTS instruction available
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| 330 | shl cx, 1 ; WORD count to BYTE count
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| 331 | dec cx ; Fix for CX overflowing on a 128 sector transfer
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| 332 | es outsb ; Source is ES segment
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| 333 | rep es outsb
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| 334 | %else ; If 8088/8086
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| 335 | shr cx, 1 ; WORD count to DWORD count
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| 336 | push ds ; Store DS
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| 337 | push es ; Copy ES...
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| 338 | pop ds ; ...to DS
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| 339 | ALIGN JUMP_ALIGN
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| 340 | .OutsdLoop:
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| 341 | lodsb ; Load from [DS:SI] to AL
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| 342 | out dx, al
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| 343 | lodsb
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| 344 | out dx, al
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| 345 | lodsb
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| 346 | out dx, al
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| 347 | lodsb
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| 348 | out dx, al
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| 349 | loop .OutsdLoop
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| 350 | pop ds ; Restore DS
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| 351 | %endif
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| 352 | ret
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| 353 |
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| 354 | ;---
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| 355 | ALIGN JUMP_ALIGN
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| 356 | WordWriteForXTIDEmod:
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| 357 | push ds
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| 358 | eSHR_IM cx, 2 ; Loop unrolling
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| 359 | push es ; Copy ES...
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| 360 | pop ds ; ...to DS
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| 361 | ALIGN JUMP_ALIGN
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| 362 | .WriteNextQword:
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| 363 | XTIDE_MOD_OUTSW
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| 364 | XTIDE_MOD_OUTSW
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| 365 | XTIDE_MOD_OUTSW
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| 366 | XTIDE_MOD_OUTSW
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| 367 | loop .WriteNextQword
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| 368 | pop ds
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| 369 | ret
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| 370 |
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| 371 | ;----
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| 372 | ALIGN JUMP_ALIGN
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| 373 | WordWrite:
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| 374 | es ; Source is ES segment
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| 375 | rep
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| 376 | db 6Fh ; OUTSW (we want this in XT build)
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| 377 | ret
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| 378 |
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| 379 | ALIGN JUMP_ALIGN
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| 380 | DWordWrite:
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| 381 | shr cx, 1 ; WORD count to DWORD count
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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 | ; Lookup tables to get transfer function based on bus type
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| 390 | ALIGN WORD_ALIGN
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| 391 | g_rgfnPioRead:
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| 392 | dw DualByteReadForXtide ; DEVICE_8BIT_DUAL_PORT_XTIDE
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| 393 | %ifdef USE_186
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| 394 | dw WordReadForXTplusAndAT ; DEVICE_XTIDE_WITH_REVERSED_A3_AND_A0
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| 395 | %else
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| 396 | dw WordReadForXTIDEmod
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| 397 | %endif
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| 398 | dw SingleByteRead ; DEVICE_8BIT_SINGLE_PORT
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| 399 | dw WordReadForXTplusAndAT ; DEVICE_16BIT_ATA
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| 400 | dw DWordRead ; DEVICE_32BIT_ATA
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| 401 |
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| 402 | g_rgfnPioWrite:
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| 403 | dw DualByteWriteForXtide ; DEVICE_8BIT_DUAL_PORT_XTIDE
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| 404 | dw WordWriteForXTIDEmod ; DEVICE_XTIDE_WITH_REVERSED_A3_AND_A0
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| 405 | dw SingleByteWrite ; DEVICE_8BIT_SINGLE_PORT
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| 406 | dw WordWrite ; DEVICE_16BIT_ATA
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| 407 | dw DWordWrite ; DEVICE_32BIT_ATA
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