| 1 | ; Project name : XTIDE Universal BIOS
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| 2 | ; Description : Int 13h function AH=8h, Read Disk Drive Parameters.
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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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| 8 | ; Int 13h function AH=8h, Read Disk Drive Parameters.
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| 9 | ;
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| 10 | ; AH8h_HandlerForReadDiskDriveParameters
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| 11 | ; Parameters:
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| 12 | ; DL: Translated Drive number
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| 13 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 14 | ; SS:BP: Ptr to IDEPACK
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| 15 | ; Returns with INTPACK:
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| 16 | ; CH: Maximum cylinder number, bits 7...0
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| 17 | ; CL: Bits 7...6: Cylinder number bits 9...8
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| 18 | ; Bits 5...0: Maximum sector number (1...63)
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| 19 | ; DH: Maximum head number (0...255)
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| 20 | ; DL: Number of drives
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| 21 | ; AH: Int 13h/40h floppy return status
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| 22 | ; CF: 0 if successfull, 1 if error
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| 23 | ;--------------------------------------------------------------------
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| 24 | AH8h_HandlerForReadDiskDriveParameters:
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| 25 | call RamVars_IsDriveHandledByThisBIOS
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| 26 | jnc SHORT .GetDriveParametersForForeignHardDiskInDL
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| 27 | call AH8h_GetDriveParameters
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| 28 | jmp SHORT .ReturnAfterStoringValuesToIntpack
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| 29 |
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| 30 | .GetDriveParametersForForeignHardDiskInDL:
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| 31 | call Int13h_CallPreviousInt13hHandler
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| 32 | jc SHORT .ReturnErrorFromPreviousInt13hHandler
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| 33 | call RamVars_GetCountOfKnownDrivesToDL
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| 34 | .ReturnAfterStoringValuesToIntpack:
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| 35 | mov [bp+IDEPACK.intpack+INTPACK.cx], cx
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| 36 | mov [bp+IDEPACK.intpack+INTPACK.dx], dx
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| 37 | xor ah, ah
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| 38 | .ReturnErrorFromPreviousInt13hHandler:
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| 39 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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| 40 |
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| 41 |
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| 42 | ;--------------------------------------------------------------------
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| 43 | ; Returns L-CHS parameters for drive and total hard disk count.
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| 44 | ;
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| 45 | ; AH8h_GetDriveParameters
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| 46 | ; Parameters:
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| 47 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 48 | ; Returns:
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| 49 | ; CH: Maximum cylinder number, bits 7...0
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| 50 | ; CL: Bits 7...6: Cylinder number bits 9...8
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| 51 | ; Bits 5...0: Maximum sector number (1...63)
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| 52 | ; DH: Maximum head number (0...255)
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| 53 | ; DL: Number of drives
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| 54 | ; Corrupts registers:
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| 55 | ; AX, BX
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| 56 | ;--------------------------------------------------------------------
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| 57 | AH8h_GetDriveParameters:
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| 58 | call AccessDPT_GetLCHStoAXBLBH
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| 59 | ; Fall to .PackReturnValues
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| 60 |
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| 61 | ;--------------------------------------------------------------------
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| 62 | ; Packs L-CHS values to INT 13h, AH=08h return values.
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| 63 | ;
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| 64 | ; .PackReturnValues
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| 65 | ; Parameters:
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| 66 | ; AX: Number of L-CHS cylinders available (1...1024)
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| 67 | ; BL: Number of L-CHS heads (1...256)
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| 68 | ; BH: Number of L-CHS sectors per track (1...63)
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| 69 | ; DS: RAMVARS segment
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| 70 | ; Returns:
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| 71 | ; CH: Maximum cylinder number, bits 7...0
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| 72 | ; CL: Bits 7...6: Cylinder number bits 9...8
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| 73 | ; Bits 5...0: Maximum sector number (1...63)
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| 74 | ; DH: Maximum head number (0...255)
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| 75 | ; DL: Number of drives
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| 76 | ; Corrupts registers:
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| 77 | ; AX, BX
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| 78 | ;--------------------------------------------------------------------
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| 79 | .PackReturnValues:
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| 80 | dec ax ; AX = Number of last cylinder
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| 81 | dec bx ; BL = Number of last head
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| 82 | xchg cx, ax
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| 83 | xchg cl, ch ; CH = Last cylinder bits 0...7
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| 84 | eROR_IM cl, 2 ; CL bits 6...7 = Last cylinder bits 8...9
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| 85 | or cl, bh ; CL bits 0...5 = Sectors per track
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| 86 | mov dh, bl ; DH = Maximum head number
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| 87 | jmp RamVars_GetCountOfKnownDrivesToDL
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