| 1 | ; Project name : XTIDE Universal BIOS
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| 2 | ; Description : Int 13h function AH=9h, Initialize 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=9h, Initialize Drive Parameters.
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| 9 | ;
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| 10 | ; AH9h_HandlerForInitializeDriveParameters
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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 | ; AH: Int 13h return status
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| 17 | ; CF: 0 if succesfull, 1 if error
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| 18 | ;--------------------------------------------------------------------
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| 19 | AH9h_HandlerForInitializeDriveParameters:
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| 20 | %ifndef USE_186
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| 21 | call AH9h_InitializeDriveForUse
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| 22 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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| 23 | %else
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| 24 | push Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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| 25 | ; Fall to AH9h_InitializeDriveForUse
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| 26 | %endif
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| 27 |
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| 28 |
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| 29 | ;--------------------------------------------------------------------
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| 30 | ; Initialized drive to be ready for use.
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| 31 | ;
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| 32 | ; AH9h_InitializeDriveForUse
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| 33 | ; Parameters:
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| 34 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 35 | ; SS:BP: Ptr to IDEPACK
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| 36 | ; Returns:
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| 37 | ; AH: Int 13h return status
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| 38 | ; CF: 0 if succesfull, 1 if error
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| 39 | ; Corrupts registers:
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| 40 | ; AL, BX, DX
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| 41 | ;--------------------------------------------------------------------
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| 42 | AH9h_InitializeDriveForUse:
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| 43 | push cx
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| 44 |
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| 45 | ; Try to select drive and wait until ready
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| 46 | or BYTE [di+DPT.bFlagsHigh], MASKH_DPT_RESET ; Everything uninitialized
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| 47 | call AccessDPT_GetDriveSelectByteToAL
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| 48 | mov [bp+IDEPACK.bDrvAndHead], al
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| 49 | call Device_SelectDrive
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| 50 | jc SHORT .ReturnNotSuccessfull
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| 51 | and BYTE [di+DPT.bFlagsHigh], ~FLGH_DPT_RESET_nDRDY ; Clear since success
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| 52 |
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| 53 | ; Initialize CHS parameters if LBA is not used
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| 54 | call InitializeDeviceParameters
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| 55 | jc SHORT .RecalibrateDrive
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| 56 | and BYTE [di+DPT.bFlagsHigh], ~FLGH_DPT_RESET_nINITPRMS
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| 57 |
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| 58 | ; Recalibrate drive by seeking to cylinder 0
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| 59 | .RecalibrateDrive:
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| 60 | call AH11h_RecalibrateDrive
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| 61 | jc SHORT .InitializeBlockMode
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| 62 | and BYTE [di+DPT.bFlagsHigh], ~FLGH_DPT_RESET_nRECALIBRATE
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| 63 |
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| 64 | ; Initialize block mode transfers
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| 65 | .InitializeBlockMode:
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| 66 | call InitializeBlockMode
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| 67 | jc SHORT .ReturnNotSuccessfull
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| 68 | and BYTE [di+DPT.bFlagsHigh], ~FLGH_DPT_RESET_nSETBLOCK ; Keeps CF clear
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| 69 |
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| 70 | .ReturnNotSuccessfull:
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| 71 | pop cx
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| 72 | ret
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| 73 |
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| 74 |
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| 75 | ;--------------------------------------------------------------------
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| 76 | ; InitializeDeviceParameters
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| 77 | ; Parameters:
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| 78 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 79 | ; SS:BP: Ptr to IDEPACK
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| 80 | ; Returns:
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| 81 | ; AH: BIOS Error code
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| 82 | ; CF: Cleared if succesfull
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| 83 | ; Set if any error
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| 84 | ; Corrupts registers:
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| 85 | ; AL, BX, CX, DX
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| 86 | ;--------------------------------------------------------------------
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| 87 | InitializeDeviceParameters:
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| 88 | ; No need to initialize CHS parameters if LBA mode enabled
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| 89 | test BYTE [di+DPT.bFlagsLow], FLG_DRVNHEAD_LBA ; Clear CF
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| 90 | jnz SHORT ReturnSuccessSinceInitializationNotNeeded
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| 91 |
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| 92 | ; Initialize Logical Sectors per Track and Max Head number
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| 93 | mov ah, [di+DPT.bPchsHeads]
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| 94 | dec ah ; Max Head number
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| 95 | mov dl, [di+DPT.bPchsSectors] ; Sectors per Track
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| 96 | mov al, COMMAND_INITIALIZE_DEVICE_PARAMETERS
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| 97 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_BSY, FLG_STATUS_BSY)
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| 98 | jmp Idepack_StoreNonExtParametersAndIssueCommandFromAL
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| 99 |
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| 100 |
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| 101 | ;--------------------------------------------------------------------
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| 102 | ; InitializeBlockMode
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| 103 | ; Parameters:
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| 104 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 105 | ; Returns:
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| 106 | ; AH: BIOS Error code
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| 107 | ; CF: Cleared if succesfull
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| 108 | ; Set if any error
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| 109 | ; Corrupts registers:
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| 110 | ; AL, BX, CX, DX
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| 111 | ;--------------------------------------------------------------------
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| 112 | InitializeBlockMode:
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| 113 | test BYTE [di+DPT.bFlagsHigh], FLGH_DPT_BLOCK_MODE_SUPPORTED ; Clear CF
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| 114 | jz SHORT ReturnSuccessSinceInitializationNotNeeded
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| 115 |
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| 116 | mov al, [di+DPT_ATA.bMaxBlock] ; Load max block size, zero AH
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| 117 | jmp AH24h_SetBlockSize
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| 118 | ReturnSuccessSinceInitializationNotNeeded:
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| 119 | ret
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