| [150] | 1 | ; Project name : XTIDE Universal BIOS |
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| 2 | ; Description : IDE Register I/O functions. |
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| 3 | |
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| 4 | ; Section containing code |
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| 5 | SECTION .text |
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| 6 | |
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| 7 | ;-------------------------------------------------------------------- |
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| [160] | 8 | ; IdeIO_OutputALtoIdeRegisterInDL |
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| [150] | 9 | ; Parameters: |
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| 10 | ; AL: Byte to output |
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| [160] | 11 | ; DL: IDE Register |
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| 12 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| [150] | 13 | ; Returns: |
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| 14 | ; Nothing |
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| 15 | ; Corrupts registers: |
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| [160] | 16 | ; BX, DX |
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| [150] | 17 | ;-------------------------------------------------------------------- |
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| 18 | ALIGN JUMP_ALIGN |
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| [160] | 19 | IdeIO_OutputALtoIdeRegisterInDL: |
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| 20 | mov bx, IDEVARS.wPort |
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| 21 | call GetPortToDXandTranslateA0andA3ifNecessary |
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| [150] | 22 | out dx, al |
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| 23 | ret |
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| 24 | |
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| 25 | |
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| 26 | ;-------------------------------------------------------------------- |
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| [160] | 27 | ; IdeIO_OutputALtoIdeControlBlockRegisterInDL |
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| [150] | 28 | ; Parameters: |
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| 29 | ; AL: Byte to output |
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| [160] | 30 | ; DL: IDE Control Block Register |
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| 31 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| [150] | 32 | ; Returns: |
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| 33 | ; Nothing |
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| 34 | ; Corrupts registers: |
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| [160] | 35 | ; BX, DX |
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| [150] | 36 | ;-------------------------------------------------------------------- |
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| 37 | ALIGN JUMP_ALIGN |
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| [160] | 38 | IdeIO_OutputALtoIdeControlBlockRegisterInDL: |
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| 39 | mov bx, IDEVARS.wPortCtrl |
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| 40 | call GetPortToDXandTranslateA0andA3ifNecessary |
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| [150] | 41 | out dx, al |
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| 42 | ret |
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| 43 | |
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| 44 | |
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| 45 | ;-------------------------------------------------------------------- |
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| [160] | 46 | ; IdeIO_InputToALfromIdeRegisterInDL |
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| [150] | 47 | ; Parameters: |
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| [160] | 48 | ; DL: IDE Register |
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| 49 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| [150] | 50 | ; Returns: |
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| 51 | ; AL: Inputted byte |
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| 52 | ; Corrupts registers: |
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| [160] | 53 | ; BX, DX |
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| [150] | 54 | ;-------------------------------------------------------------------- |
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| 55 | ALIGN JUMP_ALIGN |
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| [160] | 56 | IdeIO_InputToALfromIdeRegisterInDL: |
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| 57 | mov bx, IDEVARS.wPort |
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| 58 | call GetPortToDXandTranslateA0andA3ifNecessary |
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| [150] | 59 | in al, dx |
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| 60 | ret |
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| [160] | 61 | |
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| 62 | |
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| 63 | ;-------------------------------------------------------------------- |
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| 64 | ; GetPortToDXandTranslateA0andA3ifNecessary |
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| 65 | ; Parameters: |
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| 66 | ; BX: Offset to port in IDEVARS (IDEVARS.wPort or IDEVARS.wPortCtrl) |
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| 67 | ; DL: IDE Register |
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| 68 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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| 69 | ; Returns: |
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| 70 | ; DX: Source/Destination Port |
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| 71 | ; Corrupts registers: |
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| 72 | ; BX |
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| 73 | ;-------------------------------------------------------------------- |
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| 74 | ALIGN JUMP_ALIGN |
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| 75 | GetPortToDXandTranslateA0andA3ifNecessary: |
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| 76 | xor dh, dh ; DX now has IDE register offset |
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| 77 | add bl, [di+DPT.bIdevarsOffset] ; CS:BX now points port address |
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| 78 | add dx, [cs:bx] |
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| 79 | test BYTE [di+DPT.bFlagsHigh], FLGH_DPT_REVERSED_A0_AND_A3 |
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| 80 | jz SHORT .ReturnPortInDX |
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| 81 | |
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| 82 | ; Exchange address lines A0 and A3 from DL |
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| 83 | mov bl, dl |
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| 84 | mov bh, MASK_A3_AND_A0_ADDRESS_LINES |
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| 85 | and bh, bl ; BH = 0, 1, 8 or 9, we can ignore 0 and 9 |
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| 86 | jz SHORT .ReturnPortInDX ; Jump out since DH is 0 |
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| 87 | xor bh, MASK_A3_AND_A0_ADDRESS_LINES |
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| 88 | jz SHORT .ReturnPortInDX ; Jump out since DH was 9 |
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| 89 | and dl, ~MASK_A3_AND_A0_ADDRESS_LINES |
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| 90 | or dl, bh ; Address lines now reversed |
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| 91 | .ReturnPortInDX: |
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| 92 | ret |
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