[238] | 1 | ; Project name : XTIDE Universal BIOS |
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| 2 | ; Description : Memory mapped IDE Device transfer functions. |
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| 3 | |
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| 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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[242] | 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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[238] | 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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[242] | 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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[238] | 39 | ; Initialize MEMPIOVARS |
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[242] | 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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[238] | 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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[242] | 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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[238] | 55 | |
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[242] | 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 succesfull |
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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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[267] | 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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[238] | 75 | |
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[242] | 76 | call WaitUntilReadyToTransferNextBlock |
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| 77 | jc SHORT ReturnWithMemoryIOtransferErrorInAH |
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| 78 | |
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[267] | 79 | mov cx, [bp+MEMPIOVARS.wWordsInBlock] |
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[242] | 80 | |
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[238] | 81 | ALIGN JUMP_ALIGN |
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[242] | 82 | .ReadNextBlockFromDrive: |
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[267] | 83 | cmp [bp+MEMPIOVARS.wWordsLeft], cx |
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[242] | 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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[238] | 88 | |
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[242] | 89 | ; Increment number of successfully read WORDs |
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[267] | 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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[242] | 93 | jmp SHORT .ReadNextBlockFromDrive |
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[238] | 94 | |
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[242] | 95 | ALIGN JUMP_ALIGN |
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| 96 | .ReadLastBlockFromDrive: |
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[267] | 97 | mov ch, [bp+MEMPIOVARS.wWordsLeft+1] ; Sectors left |
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[242] | 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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[267] | 109 | mov cx, [bp+MEMPIOVARS.wWordsDone] |
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[242] | 110 | jc SHORT .ConvertTransferredWordsInCXtoSectors |
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[267] | 111 | add cx, [bp+MEMPIOVARS.wWordsLeft] ; Never sets CF |
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[242] | 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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[238] | 117 | ;-------------------------------------------------------------------- |
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[242] | 118 | ; WriteToSectorAccessWindow |
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[238] | 119 | ; Parameters: |
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[242] | 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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[238] | 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 succesfull |
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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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[242] | 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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[238] | 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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[267] | 143 | mov cx, [bp+MEMPIOVARS.wWordsInBlock] |
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[242] | 144 | |
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[238] | 145 | ALIGN JUMP_ALIGN |
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| 146 | .WriteNextBlockToDrive: |
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[267] | 147 | cmp [bp+MEMPIOVARS.wWordsLeft], cx |
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[238] | 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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[267] | 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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[238] | 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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[267] | 161 | mov ch, [bp+MEMPIOVARS.wWordsLeft+1] ; Sectors left |
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[266] | 162 | ePUSH_T bx, CheckErrorsAfterTransferringLastMemoryMappedBlock |
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[242] | 163 | ; Fall to WriteSingleBlockFromDSSIToSectorAccessWindowInESDI |
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[238] | 164 | |
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| 165 | ;-------------------------------------------------------------------- |
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| 166 | ; WriteSingleBlockFromDSSIToSectorAccessWindowInESDI |
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| 167 | ; Parameters: |
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[242] | 168 | ; CH: Number of sectors in block |
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[238] | 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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[242] | 175 | ; BX |
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[238] | 176 | ;-------------------------------------------------------------------- |
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| 177 | ALIGN JUMP_ALIGN |
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| 178 | WriteSingleBlockFromDSSIToSectorAccessWindowInESDI: |
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[242] | 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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[238] | 185 | rep movsw |
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[242] | 186 | mov di, bx ; Reset for next sector |
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[238] | 187 | dec dx |
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[242] | 188 | jnz SHORT .WriteBlock |
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[238] | 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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[242] | 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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[238] | 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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[242] | 202 | ; BX |
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[238] | 203 | ;-------------------------------------------------------------------- |
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| 204 | ALIGN JUMP_ALIGN |
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| 205 | ReadSingleBlockFromSectorAccessWindowInDSSItoESDI: |
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[242] | 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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[238] | 212 | rep movsw |
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[242] | 213 | mov si, bx ; Reset for next sector |
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[238] | 214 | dec dx |
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[242] | 215 | jnz SHORT .ReadBlock |
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[238] | 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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[242] | 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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