2023-03-09 21:35:56 -08:00
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DMAData Label Byte
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; Port/Mask, Port/Clear, Port/DMAMode, Address, Page, Count, Port/Mask
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DB 0Ah, 4, 0Ch, 0, 0Bh, 08h, 87h, 0, 1, 0Ah, 0
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DB 0Ah, 5, 0Ch, 0, 0Bh, 09h, 83h, 2, 3, 0Ah, 1
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DB 0Ah, 6, 0Ch, 0, 0Bh, 0Ah, 81h, 4, 5, 0Ah, 2
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DB 0Ah, 7, 0Ch, 0, 0Bh, 0Bh, 82h, 6, 7, 0Ah, 3
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DB 0D4h, 4, 0D8h, 0, 0D6h, 08h, 8Fh, 0C0h, 0C2h, 0D4h, 0
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DB 0D4h, 5, 0D8h, 0, 0D6h, 09h, 8Bh, 0C4h, 0C6h, 0D4h, 1
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DB 0D4h, 6, 0D8h, 0, 0D6h, 0Ah, 89h, 0C8h, 0CAh, 0D4h, 2
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DB 0D4h, 7, 0D8h, 0, 0D6h, 0Bh, 8Ah, 0CCh, 0CEh, 0D4h, 3
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ActualDMAPtr Label DWord
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ActualDMAOffset DW 0
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ActualDMASegment DW 0
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;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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Proc SetDMA ; BX:AX points to DMA buffer
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; DL = DMA Channel
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; DI = DMA Size
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PushA
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Push DS
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Push CS
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Pop DS
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Assume DS:Driver
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Mov ActualDMASegment, BX
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Mov ActualDMAOffset, AX
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Mov CH, BH
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ShR CH, 4
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ShL BX, 4
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Add BX, AX
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AdC CH, 0
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Mov SI, BX ; CH:BH:BL contains 24 bit DMA address
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Neg SI
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Cmp SI, DI
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JA SetDMA1
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Add ActualDMAOffset, SI
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Add BX, SI
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AdC CH, 0
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SetDMA1:
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Cmp DL, 3
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JBE SetDMA2
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ShR DI, 1
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Push CX
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ShR CH, 1
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Pop CX
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RCR BX, 1
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SetDMA2:
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Mov AL, 11
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Mul DL
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Mov SI, AX
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Add SI, Offset DMAData
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Xor DX, DX
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LodsB ; Set mask
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Mov DL, AL
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LodsB
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Out DX, AL
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LodsB ; Clear Ptrs
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Mov DL, AL
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LodsB
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Out DX, AL
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LodsB ; Set Mode
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Mov DL, AL
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LodsB
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Out DX, AL
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LodsB
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Mov DL, AL ; DL = page port
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Mov AL, CH
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Out DX, AL
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LodsB
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Mov DL, AL ; DL = address port
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Mov AL, BL
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Out DX, AL
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Mov AL, BH
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Out DX, AL
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LodsB
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Mov DL, AL ; DL = count port
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Mov AX, DI
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Dec AX
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Out DX, AL
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Mov AL, AH
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Out DX, AL
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LodsB ; Reset mask
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Mov DL, AL
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LodsB
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Out DX, AL
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Pop DS
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PopA
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Ret
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EndP SetDMA
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Assume DS:Nothing
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;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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