[148] | 1 | ; Project name : XTIDE Universal BIOS
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[3] | 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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[148] | 12 | ; DL: Translated Drive number
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| 13 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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[150] | 14 | ; SS:BP: Ptr to IDEPACK
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| 15 | ; Returns with INTPACK:
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[3] | 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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[84] | 20 | %ifndef USE_186
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[3] | 21 | call AH9h_InitializeDriveForUse
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[148] | 22 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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[84] | 23 | %else
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[148] | 24 | push Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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[162] | 25 | ; Fall to AH9h_InitializeDriveForUse
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[84] | 26 | %endif
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[3] | 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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[148] | 34 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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[150] | 35 | ; SS:BP: Ptr to IDEPACK
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[3] | 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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[148] | 40 | ; AL, BX, DX
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[3] | 41 | ;--------------------------------------------------------------------
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| 42 | AH9h_InitializeDriveForUse:
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[276] | 43 | push si
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[3] | 44 | push cx
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| 45 |
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[258] | 46 | %ifdef MODULE_SERIAL
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| 47 | ;
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| 48 | ; no need to do this for serial deveices, and we use the DPT_RESET flag bits
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| 49 | ; to store the drive type for serial floppy drives (MODULE_SERIAL_FLOPPY)
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| 50 | ;
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| 51 | xor ah, ah
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| 52 | test byte [di+DPT.bFlagsHigh], FLGH_DPT_SERIAL_DEVICE ; Clears CF
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| 53 | jnz .ReturnNotSuccessfull
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| 54 | %endif
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| 55 |
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[3] | 56 | ; Try to select drive and wait until ready
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[158] | 57 | or BYTE [di+DPT.bFlagsHigh], MASKH_DPT_RESET ; Everything uninitialized
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[150] | 58 | call AccessDPT_GetDriveSelectByteToAL
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| 59 | mov [bp+IDEPACK.bDrvAndHead], al
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| 60 | call Device_SelectDrive
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[3] | 61 | jc SHORT .ReturnNotSuccessfull
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[158] | 62 | and BYTE [di+DPT.bFlagsHigh], ~FLGH_DPT_RESET_nDRDY ; Clear since success
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[3] | 63 |
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| 64 | ; Initialize CHS parameters if LBA is not used
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[150] | 65 | call InitializeDeviceParameters
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[276] | 66 | jc SHORT .SetWriteCache
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[158] | 67 | and BYTE [di+DPT.bFlagsHigh], ~FLGH_DPT_RESET_nINITPRMS
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[3] | 68 |
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[276] | 69 | ; Enable or Disable Write Cache
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| 70 | .SetWriteCache:
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[279] | 71 | call SetWriteCache
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[276] | 72 |
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[3] | 73 | ; Recalibrate drive by seeking to cylinder 0
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| 74 | .RecalibrateDrive:
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| 75 | call AH11h_RecalibrateDrive
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| 76 | jc SHORT .InitializeBlockMode
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[158] | 77 | and BYTE [di+DPT.bFlagsHigh], ~FLGH_DPT_RESET_nRECALIBRATE
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[3] | 78 |
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| 79 | ; Initialize block mode transfers
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| 80 | .InitializeBlockMode:
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[150] | 81 | call InitializeBlockMode
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[3] | 82 | jc SHORT .ReturnNotSuccessfull
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[158] | 83 | and BYTE [di+DPT.bFlagsHigh], ~FLGH_DPT_RESET_nSETBLOCK ; Keeps CF clear
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[3] | 84 |
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| 85 | .ReturnNotSuccessfull:
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| 86 | pop cx
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[276] | 87 | pop si
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[3] | 88 | ret
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| 89 |
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| 90 |
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| 91 | ;--------------------------------------------------------------------
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[150] | 92 | ; InitializeDeviceParameters
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[3] | 93 | ; Parameters:
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[150] | 94 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 95 | ; SS:BP: Ptr to IDEPACK
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[3] | 96 | ; Returns:
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| 97 | ; AH: BIOS Error code
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| 98 | ; CF: Cleared if succesfull
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| 99 | ; Set if any error
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| 100 | ; Corrupts registers:
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[150] | 101 | ; AL, BX, CX, DX
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[3] | 102 | ;--------------------------------------------------------------------
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[150] | 103 | InitializeDeviceParameters:
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[3] | 104 | ; No need to initialize CHS parameters if LBA mode enabled
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[158] | 105 | test BYTE [di+DPT.bFlagsLow], FLG_DRVNHEAD_LBA ; Clear CF
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[150] | 106 | jnz SHORT ReturnSuccessSinceInitializationNotNeeded
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[3] | 107 |
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[157] | 108 | ; Initialize Logical Sectors per Track and Max Head number
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[227] | 109 | mov ah, [di+DPT.bPchsHeads]
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[150] | 110 | dec ah ; Max Head number
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[227] | 111 | mov dl, [di+DPT.bPchsSectors] ; Sectors per Track
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[150] | 112 | mov al, COMMAND_INITIALIZE_DEVICE_PARAMETERS
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| 113 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_BSY, FLG_STATUS_BSY)
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| 114 | jmp Idepack_StoreNonExtParametersAndIssueCommandFromAL
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[3] | 115 |
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| 116 |
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| 117 | ;--------------------------------------------------------------------
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[276] | 118 | ; SetWriteCache
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| 119 | ; Parameters:
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| 120 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 121 | ; Returns:
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| 122 | ; AH: BIOS Error code
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| 123 | ; CF: Cleared if succesfull
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| 124 | ; Set if any error
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| 125 | ; Corrupts registers:
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| 126 | ; AL, BX, CX, DX, SI
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| 127 | ;--------------------------------------------------------------------
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| 128 | SetWriteCache:
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| 129 | call AccessDPT_GetPointerToDRVPARAMStoCSBX
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| 130 | mov bl, [cs:bx+DRVPARAMS.wFlags]
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| 131 | and bx, BYTE MASK_DRVPARAMS_WRITECACHE
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| 132 | jz SHORT ReturnSuccessSinceInitializationNotNeeded ; DEFAULT_WRITE_CACHE
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| 133 | mov si, [cs:bx+.rgbWriteCacheCommands]
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| 134 | jmp AH23h_SetControllerFeatures
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| 135 |
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| 136 | .rgbWriteCacheCommands:
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| 137 | db 0 ; DEFAULT_WRITE_CACHE
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| 138 | db FEATURE_DISABLE_WRITE_CACHE ; DISABLE_WRITE_CACHE
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| 139 | db FEATURE_ENABLE_WRITE_CACHE ; ENABLE_WRITE_CACHE
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| 140 |
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| 141 |
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| 142 | ;--------------------------------------------------------------------
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[150] | 143 | ; InitializeBlockMode
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[3] | 144 | ; Parameters:
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[150] | 145 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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[3] | 146 | ; Returns:
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| 147 | ; AH: BIOS Error code
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| 148 | ; CF: Cleared if succesfull
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| 149 | ; Set if any error
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| 150 | ; Corrupts registers:
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| 151 | ; AL, BX, CX, DX
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| 152 | ;--------------------------------------------------------------------
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[150] | 153 | InitializeBlockMode:
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[158] | 154 | test BYTE [di+DPT.bFlagsHigh], FLGH_DPT_BLOCK_MODE_SUPPORTED ; Clear CF
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[150] | 155 | jz SHORT ReturnSuccessSinceInitializationNotNeeded
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| 156 |
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[276] | 157 | call AccessDPT_GetPointerToDRVPARAMStoCSBX
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| 158 | mov al, 1 ; Disable block mode
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| 159 | test BYTE [cs:bx+DRVPARAMS.wFlags], FLG_DRVPARAMS_BLOCKMODE
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| 160 | eCMOVNZ al, [di+DPT_ATA.bMaxBlock] ; Load max block size
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[3] | 161 | jmp AH24h_SetBlockSize
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[150] | 162 | ReturnSuccessSinceInitializationNotNeeded:
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[276] | 163 | xor ah, ah
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[3] | 164 | ret
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