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3546 lines
90 KiB
3546 lines
90 KiB
;/*
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; * Microsoft Confidential
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; * Copyright (C) Microsoft Corporation 1991
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; * All Rights Reserved.
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; */
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;===========================================================================
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;
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; FILE: DSKFRMT.ASM
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;
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;===========================================================================
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;===========================================================================
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;Declaration of include files
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;===========================================================================
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debug equ 0
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.xlist
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INCLUDE DOSEQUS.INC
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INCLUDE DOSMAC.INC
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INCLUDE SYSCALL.INC
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INCLUDE ERROR.INC
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INCLUDE BPB.INC
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INCLUDE FOREQU.INC
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INCLUDE FORMACRO.INC
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INCLUDE IOCTL.INC
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INCLUDE FORSWTCH.INC
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.list
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;===========================================================================
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; Declarations for all publics in other modules used by this module
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;===========================================================================
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;===========================================================================
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; Data segment
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;===========================================================================
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DATA SEGMENT PUBLIC PARA 'DATA'
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;Bytes
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EXTRN fBigFat :BYTE
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EXTRN fBig32Fat :BYTE
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EXTRN ExitStatus :BYTE
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EXTRN DblFlg :BYTE
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EXTRN DriveToFormat :BYTE
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EXTRN msgFormatFailure :BYTE
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EXTRN msgDiskUnusable :BYTE
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EXTRN msgNotSystemDisk :BYTE
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EXTRN msgParametersNotSupported:BYTE
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EXTRN msgParametersNotSupportedByDrive:BYTE
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EXTRN msgHardDiskWarning :BYTE
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EXTRN msgDiskWarning :BYTE
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EXTRN msgInsertDisk :BYTE
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EXTRN msgCrLf :BYTE
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EXTRN msgCurrentTrack :BYTE
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EXTRN msgFormatComplete :BYTE
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EXTRN msgVerify :BYTE
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EXTRN msgSetBadClus :BYTE
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EXTRN msgSetBadClusDone :BYTE
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EXTRN ContinueMsg :BYTE
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EXTRN Extended_Error_Msg :BYTE
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EXTRN Clustbound_Flag :BYTE
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EXTRN Fatal_Error :BYTE
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EXTRN FATNotAllInMem :BYTE
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EXTRN msgInsufficientMemory :BYTE
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EXTRN msgWriteFat :BYTE
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;Words
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EXTRN FirstHead :WORD
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EXTRN FirstCylinder :WORD
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EXTRN Formatted_Tracks_Low :WORD
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EXTRN Formatted_Tracks_High :WORD
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EXTRN Paras_Per_Fat :WORD
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EXTRN SwitchMap :WORD
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EXTRN SwitchMap2 :WORD
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EXTRN Relative_Sector_Low :WORD
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EXTRN Relative_Sector_High :WORD
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EXTRN Clustbound_Buffer_Seg :WORD
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EXTRN Clustbound_Adj_Factor :WORD
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EXTRN Clustbound_Spt_Count :WORD
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; Dwords
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EXTRN TracksLeft :DWORD
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EXTRN TracksPerDisk :DWORD
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EXTRN sector_in_buffer :DWORD
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EXTRN sector_to_read :DWORD
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EXTRN TotalClusters :DWORD
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EXTRN StartSector :DWORD
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EXTRN FATSecCntInMem :DWORD
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;Pointers
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EXTRN SysSiz :DWORD
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EXTRN BioSiz :DWORD
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EXTRN Msg_Allocation_Unit_Val :DWORD
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EXTRN FatSpace :DWORD
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EXTRN FatSector :DWORD
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;Structures
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EXTRN DeviceParameters :BYTE
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EXTRN IsExtRAWIODrv :BYTE
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EXTRN FormatPacket :BYTE
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EXTRN Read_Write_Relative :BYTE
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RWPacket a_TrackReadWritePacket <>
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ifdef NEC_98
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RW_TRF_Area db 2048 dup(0)
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else
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RW_TRF_Area db 512 dup(0)
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endif
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fLastChance db FALSE ; Flags reinvocation from
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; LastChanceToSaveIt. Used by DskPrm
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FormatError db 0
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Format_End db FALSE
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Track_Action db ? ; Actual operation performed on disk
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odd_entry db 1 ; flag for 12-bit FAT entry alignment
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entry_offset dw ? ; Offset of entry from start of sector
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PercentComplete dw 0FFFFh ; Init non-zero so msg will display
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; first time
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Fat_Init_Value dw 0 ; initializes the Fat
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SysTrks dd ?
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Sectors dw ?
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CurrentHead dw 0
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CurrentCylinder dw 0
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Tracks_To_Format dw ?
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Track_Count dw ?
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CurrentCluster dd ? ; holds the cluster currently being checked
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; in QuickFormat
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BadClusValue dd ? ; holds FAT entry value for bad cluster
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BadClusBitMap dd 0
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CurrFATInMemStartSec dd 0
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CurrFATInMemSecCnt dd 0
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CurrFATInMemStartClus dd 0
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FATInMemClusCnt dd 0
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DATA ENDS
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;===========================================================================
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; Executable code segment
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;===========================================================================
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CODE SEGMENT PUBLIC PARA 'CODE'
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ASSUME CS:CODE, DS:DATA, ES:DATA
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;===========================================================================
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;EXTRNs needed in code segment
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;===========================================================================
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;Labels
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EXTRN FatalExit :NEAR
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EXTRN CrLf :NEAR
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;Functions
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EXTRN DetermineExistingFormatNoMsg :NEAR
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EXTRN SetStartSector :NEAR
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EXTRN SetfBigFat :NEAR
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EXTRN Phase2Initialization :NEAR
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EXTRN GetBioSize :NEAR
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EXTRN GetDosSize :NEAR
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EXTRN GetCmdSize :NEAR
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EXTRN LastChanceToSaveIt :NEAR
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EXTRN AccessDisk :NEAR
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EXTRN Yes? :NEAR
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EXTRN ExitProgram :NEAR
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EXTRN User_String :NEAR
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EXTRN Read_Disk :NEAR
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EXTRN Seg_Adj :NEAR
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EXTRN IsDblSpaceDisk :NEAR
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EXTRN Write_Disk :NEAR
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EXTRN ShowFormatSize :NEAR
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;Constants
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EXTRN EXIT_FATAL :ABS
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EXTRN EXIT_NO :ABS
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EXTRN EXIT_DRV_NOT_READY :ABS
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EXTRN EXIT_WRIT_PROTECT :ABS
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EXTRN EXIT_FATAL :ABS
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EXTRN EXIT_NO :ABS
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;===========================================================================
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; Declarations for all publics in this module
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;===========================================================================
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PUBLIC Disk_Format_Proc
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PUBLIC FrmtProb
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PUBLIC fLastChance
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PUBLIC CurrentHead
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PUBLIC CurrentCylinder
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PUBLIC Multiply_32_Bits
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PUBLIC SetDeviceParameters
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PUBLIC PercentComplete
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PUBLIC Prompt_User_For_Disk
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PUBLIC calc_sector_and_offset
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PUBLIC ReadFatSector
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PUBLIC GetSetFatEntry
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PUBLIC GetFatSectorEntry
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PUBLIC DetermineTrackAction
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PUBLIC QuickFormat
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PUBLIC FlushFATBuf
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PUBLIC Fat_Init
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PUBLIC Get_Bad_Sector_Hard
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PUBLIC Multiply_32_Bits
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PUBLIC IsThisClusterBad
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PUBLIC WrtEOFMrkInRootClus
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;========================================================================
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;
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; DISK_FORMAT_PROC : This procedure is used to call
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; the real DiskFormat procedure.
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; Returns : NC --> Format successful
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; CY --> Format unsuccessful, go to next disk
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;
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;========================================================================
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Disk_Format_Proc proc near
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call DetermineTrackAction ; Check for safe format, and validity
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; of quick format switch
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call init_fat_with_header ; setup blank FAT image
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test SwitchMap,SWITCH_Q ; Check for quick format
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jz RegularFormat
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test SwitchMap,SWITCH_Z ; Check for sec/clus override
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jnz RegularFormat
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call ShowFormatSize ; size being formatted message
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call QuickFormat
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jc FarExit ; procedure exit is too far for direct jump
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Message msgFormatComplete
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FarExit:
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jmp Exit_Disk_Format_Proc
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RegularFormat:
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test SwitchMap,SWITCH_Z
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jnz no_load_old_fat ; don't need to load the old FAT
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test SwitchMap2,Switch2_C
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jnz no_load_old_fat ; don't need to load the old FAT
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call SetUpBadClusTransfer
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jnc no_load_old_fat
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Message msgInsufficientMemory
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stc
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jmp short FarExit
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no_load_old_fat:
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call ShowFormatSize ; size being formatted message
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call DiskFormat ; Format the disk
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jnc GetTrk ; check for problems
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FrmtProb:
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test SwitchMap,Switch_Select ; SELECT option?
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jnz CheckForMore ; No - display message
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Message msgFormatFailure
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mov ExitStatus, EXIT_FATAL
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CheckForMore:
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stc ; Signal error which will be handled
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; in main routine (by prompting for
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; next disk)
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jmp Exit_Disk_Format_Proc
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;Mark any bad Sectors in the Fats
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;And keep track of how many bytes there are in bad Sectors
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GetTrk:
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call BadSector ; Do bad track fix-up
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jc FrmtProb ; Had an error in Fmt - can't recover
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CMP AX,0 ; Are we finished?
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jnz TrkFnd ; No - check error conditions
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jmp Exit_Disk_Format_Proc ; Yes
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;--------------------------------------------------------------------------
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; BUG NOTE: The two sections in "if ibmcopyright..." here and below are
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; to correct a bug. If one of the Sectors just above the 32M boundary
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; were bad, it thought they were in the system area, and hence that the
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; disk was unusable.
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;
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; PYS: IBMCOPYRIGHT removed
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;
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;--------------------------------------------------------------------------
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TrkFnd:
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.386
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mov EBX,dword ptr Relative_Sector_Low ; get the sector
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cmp EBX,StartSector ; Any sec in the sys area bad?
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.8086
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jae ClrTest ; MZ 2.26 unsigned compare
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Message msgDiskUnusable
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jmp FrmtProb ; Bad disk -- try again
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ClrTest:
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mov Sectors,AX ; Save # sectors on the track
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test SwitchMap,SWITCH_S ; If sys requested calc size
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jz Bad100
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cmp BYTE PTR DblFlg,0 ; Is sys space aready calced?
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jnz cmpTrks ; Yes - all ready for the compare
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inc BYTE PTR DblFlg ; No - set the flag
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call GetBioSize ; Get the size of the Bios
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mov DX,WORD PTR SysSiz+2
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mov AX,WORD PTR SysSiz
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mov WORD PTR BioSiz+2,DX
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mov WORD PTR BioSiz,AX
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call GETDOSSIZE
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call GETCMDSIZE
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mov DX,WORD PTR BioSiz+2
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mov AX,WORD PTR BioSiz
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div DeviceParameters.DP_BPB.oldBPB.BPB_BytesPerSector
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.errnz EDP_BPB NE DP_BPB
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.386
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movzx eax,ax
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add EAX,StartSector
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mov SysTrks,EAX ; Space Fat,Dir,and system
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; files require
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cmpTrks:
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mov EBX,dword ptr Relative_Sector_Low ;get the low word of the sector
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cmp EBX,SysTrks
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.8086
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JA Bad100 ; MZ 2.26 unsigned compare
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mov ExitStatus, EXIT_FATAL
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Message msgNotSystemDisk
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AND SwitchMap,NOT SWITCH_S ; Turn off system transfer switch
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mov WORD PTR SysSiz+2,0 ; No system to transfer
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mov WORD PTR SysSiz,0 ; No system to transfer
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Bad100:
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cmp DeviceParameters.DP_DeviceType, DEV_HARDDISK ;hard disk?
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.errnz EDP_DEVICETYPE NE DP_DEVICETYPE
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jne $$IF5 ; no
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call Get_Bad_Sector_Hard ; see if a sector is bad
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jmp SHORT $$EN5
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$$IF5:
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call Get_Bad_Sector_Floppy ; mark entire track bad
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$$EN5:
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jmp GetTrk
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Exit_Disk_Format_Proc:
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ret
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Disk_Format_Proc ENDP
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;==========================================================================
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;
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; DetermineTrackAction : This procedure sets the value of
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; Track_Action based on the setting of
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; SWITCH_U, the unconditional format switch.
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; Track_Action is the function that is
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; actually performed on each track of the
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; disk to be formatted.
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;
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; Inputs : SwitchMap
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; Output : SWITCH_U set - Track_Action = Format and Verify
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; SWITCH_U clear - Track_Action = Verify only
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;
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;==========================================================================
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DetermineTrackAction proc near
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test SwitchMap,SWITCH_U
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jz Verify_Only
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Format_And_Verify:
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mov Track_Action,FORMAT_TRACK ; regular format
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ret
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Verify_Only:
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mov Track_Action,VERIFY_TRACK ; safe format
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ret
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DetermineTrackAction endp
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; =========================================================================
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; DiskFormat:
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; Format the tracks on the disk
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; Since we do our SetDeviceParameters here, we also need to
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; detect the legality of /N /T if present and abort with errors
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; if not.
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; This routine stops as soon as it encounters a bad track
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; Then BadSector is called to report the bad track, and it continues
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; the format
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;
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; Algorithm:
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; current track = first
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; while not done
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; if format track fails
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; DiskFormatErrors = true
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; return
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; next track
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; =========================================================================
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DiskFormat proc near
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mov DeviceParameters.DP_SpecialFunctions, (INSTALL_FAKE_BPB or TRACKLAYOUT_IS_GOOD)
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.errnz EDP_SPECIALFUNCTIONS NE DP_SPECIALFUNCTIONS
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lea DX, DeviceParameters
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call SetDeviceParameters
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test SwitchMap,switch_8 ; DCL 5/12/86 avoid Naples AH=18h
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jnz stdBpB ; lackof support for 8 Secs/track
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; DCL 5/12/86 - Always do the Status_FOR_FORMAT test, as we
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; don't know if the machine has this support. For 3.2 /N:
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; & /T: were not documented & therefore not fully supported
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; thru the ROM of Aquarius & Naples & Royal Palm
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; test SwitchMap, SWITCH_N or SWITCH_T ; IF (/N or /T)
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; jz StdBPB
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; THEN check if
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; supported
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; Check to see if device driver can handle specified parameters
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mov FormatPacket.FP_SpecialFunctions, Status_FOR_FORMAT
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mov AX, (IOCTL shl 8) or GENERIC_IOCTL
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mov BL, DriveToFormat
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inc BL
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mov CX, (RAWIO shl 8) or FORMAT_TRACK
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cmp IsEXTRAWIODrv,0
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je DoFrmt
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mov CX, (EXTRAWIO shl 8) or FORMAT_TRACK
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DoFrmt:
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lea DX, FormatPacket
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int 21h
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;;%out FORQUICK ENABLED!!!!!
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;; clc ;**ARR
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; switch ( FormatStatusCall)
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; cmp FormatPacket.FP_SpecialFunctions, \
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; Format_No_ROM_Support
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; jb NTSupported ; 0 returned from IBMBIO
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; ja IllegalComb ; 2 returned - ROM Support
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; Illegal Combination!
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cmp FormatPacket.FP_SpecialFunctions,0 ; 0 --> Can support
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je NTSupported
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cmp FormatPacket.FP_SpecialFunctions,2 ; 2 --> Cannot support
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jne $$IF28
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Message msgParametersNotSupportedByDrive
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mov Fatal_Error,Yes ; Indicate quittin'type err!
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jmp SHORT $$EN28
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$$IF28:
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cmp FormatPacket.FP_SpecialFunctions,3 ; 3 --> No disk in drive
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jne $$IF30
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mov AX,Error_Not_Ready ; flag not ready
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call CheckError ; set error level
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jmp FrmtProb ; exit program
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jmp SHORT $$EN30 ; DCL No ROM support is okay
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$$IF30:
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; except for /N: & /T:
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test SwitchMap, SWITCH_N or SWITCH_T ; DCL 5/12/86
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jz $$IF32
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Message msgParametersNotSupported
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mov Fatal_Error,Yes ; Indicate quittin 'type err!
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$$IF32:
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$$EN30:
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$$EN28:
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cmp Fatal_Error,Yes
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jne StdBPB
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jmp FatalExit
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; We have the support to carry
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; out the FORMAT
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NTSupported:
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StdBPB:
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mov FormatPacket.FP_SpecialFunctions, 0
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mov AX, FirstHead
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mov FormatPacket.FP_Head, AX
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mov AX, FirstCylinder
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mov FormatPacket.FP_Cylinder, AX
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;M018 - begin
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mov AX, word ptr TracksPerDisk
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mov word ptr TracksLeft, AX
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mov AX, word ptr TracksPerDisk+2
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mov word ptr TracksLeft+2, AX
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;M018 - end
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mov Format_End,False ; flag not at end of format
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call Calc_MAX_Tracks_To_Format ; Max track count for
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; FormatTrack call
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FormatLoop:
|
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call Format_Loop ; Format until CY occurs
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cmp Format_End,True ; End of Format?
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jne $$IF36
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mov FormatError,0 ; signal good format
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clc ; clear CY
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jmp SHORT $$EN36 ; bad format
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$$IF36:
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call CheckError ; determine type of error
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jc $$IF38
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call LastChanceToSaveIt ; acceptable error?
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jnc $$IF39 ; yes
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mov FormatError,1 ; signal error type
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clc ; clear CY
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jmp SHORT $$EN39 ; not acceptable error
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$$IF39:
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call SetStartSector ; start from scratch
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call SetfBigFat
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push AX
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call Phase2Initialization
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clc
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pop AX
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jmp DiskFormat ; try again
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$$EN39:
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$$IF38:
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$$EN36:
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return
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FormatDone:
|
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mov FormatError,0
|
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clc
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return
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|
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DiskFormat endp
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|
|
;=========================================================================
|
|
; Fat_INIT: This routine initializes the Fat based on the
|
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; number of paragraphs.
|
|
;
|
|
; input - FatSpace
|
|
; FatSpace+2
|
|
; paras_per_Fat
|
|
; Fat_init_value
|
|
; output - Fat space is initialized
|
|
;
|
|
; Assumes: nothing
|
|
;
|
|
;=========================================================================
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|
|
Fat_Init PROC NEAR
|
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|
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push ds
|
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push ES
|
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push DI
|
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push AX
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push BX
|
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push CX
|
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mov ax,DATA
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mov ds,ax
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|
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les di,FatSpace
|
|
mov BX,Paras_Per_Fat ; Get number of paras
|
|
mov AX,Fat_init_value
|
|
push DX
|
|
mov DX,ES ; Grab ES into DX
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|
|
$$DO87:
|
|
cmp BX,0 ; do while BX not = 0
|
|
je $$EN87 ; exit if 0
|
|
mov CX,08h ; Word store of paragraph
|
|
rep stosw ; Move the data to Fat
|
|
xor DI,DI ; Offset always init to 0
|
|
inc DX ; Next paragraph
|
|
mov ES,DX ; Put next para in ES
|
|
dec BX ; Loop iteration counter
|
|
jmp SHORT $$DO87
|
|
|
|
$$EN87:
|
|
pop DX
|
|
pop CX
|
|
pop BX
|
|
pop AX
|
|
pop DI
|
|
pop ES
|
|
pop ds
|
|
ret
|
|
|
|
Fat_Init ENDP
|
|
|
|
;=========================================================================
|
|
; SetDeviceParameters:
|
|
; Set the device parameters
|
|
;
|
|
; Input:
|
|
; Drive
|
|
; DS:DX - pointer to device parameters
|
|
;=========================================================================
|
|
|
|
SetDeviceParameters proc near
|
|
|
|
mov CX, (EXTRAWIO shl 8) or SET_DEVICE_PARAMETERS
|
|
cmp IsEXTRAWIODrv,0
|
|
jne DoIoctl
|
|
mov CX, (RAWIO shl 8) or SET_DEVICE_PARAMETERS
|
|
DoIoctl:
|
|
mov AX, (IOCTL shl 8) or GENERIC_IOCTL
|
|
mov bl, DriveToFormat
|
|
inc bl
|
|
int 21H
|
|
return
|
|
|
|
SetDeviceParameters endp
|
|
|
|
|
|
;=========================================================================
|
|
; Prompt_User_For_Disk : This routine prompts the user for the
|
|
; disk to be formatted. An appropriate
|
|
; message is chosen based on the type
|
|
; of switch entered. If the /SELECT
|
|
; switch is entered, the disk prompt is
|
|
; issued through the int 2fh services
|
|
; provided by SELECT.
|
|
;
|
|
; Inputs : SwitchMap - Switches chosen for format
|
|
;
|
|
; Outputs : Message printed as appropriate.
|
|
;=========================================================================
|
|
|
|
Procedure Prompt_User_For_Disk
|
|
|
|
push AX
|
|
test SwitchMap, (SWITCH_Backup or SWITCH_Select or SWITCH_AUTOTEST)
|
|
jnz $$IF186
|
|
ifdef NEC_98
|
|
test SwitchMap2,SWITCH2_P
|
|
jnz $$IF188
|
|
endif
|
|
call DskPrm ; prompt user for disk
|
|
|
|
$$IF186:
|
|
test SwitchMap, (Switch_Select) ; /SELECT requested?
|
|
jz $$IF188
|
|
mov AL, DriveToFormat ; get drv to access for format
|
|
call AccessDisk ; access the disk
|
|
mov AX,Select_Disk_Message ; display disk prompt
|
|
int 2fh ; through int 2fh services
|
|
|
|
$$IF188:
|
|
pop AX
|
|
ret
|
|
|
|
Prompt_User_For_Disk ENDP
|
|
|
|
;==========================================================================
|
|
; DiskPrompt:
|
|
;
|
|
; This routine prompts for the insertion of the correct diskette
|
|
; into the Target Drive, UNLESS we are being re-entrantly invoked
|
|
; from LastChanceToSaveIt. If the target is a Hardisk we issue a
|
|
; warning message.
|
|
;
|
|
; INPUTS:
|
|
; DeviceParameters.DP_DeviceType
|
|
; fLastChance
|
|
;
|
|
; OUTPUTS:
|
|
; Prompt string
|
|
; fLastChance := FALSE
|
|
;
|
|
; Registers affected:
|
|
; Flags
|
|
;
|
|
;==========================================================================
|
|
|
|
DskPrm PROC NEAR
|
|
|
|
cmp fLastChance,TRUE
|
|
je PrmptRet
|
|
|
|
cmp DeviceParameters.DP_DeviceType, DEV_HARDDISK
|
|
.errnz EDP_DEVICETYPE NE DP_DEVICETYPE
|
|
jne GoPrnIt
|
|
|
|
; DblSpaced floppies return DEV_HARDDISK to the GetDeviceParameters
|
|
; call. If this is a DblSpaced drive, go make some additional checks
|
|
; before putting out the hard disk warning.
|
|
|
|
mov al, DriveToFormat
|
|
call IsDblSpaceDisk ; sets Z flag if NOT dblspaced disk
|
|
jnz MaybeDblSpace
|
|
|
|
RealHardDisk:
|
|
test DeviceParameters.DP_DeviceAttributes, 1
|
|
.errnz EDP_DEVICEATTRIBUTES NE DP_DEVICEATTRIBUTES
|
|
jnz non_rem
|
|
Message msgDiskWarning
|
|
jmp short ask_yes
|
|
non_rem:
|
|
ifndef OPKBLD
|
|
Message msgHardDiskWarning
|
|
endif ;OPKBLD
|
|
ask_yes:
|
|
ifndef OPKBLD
|
|
call Yes?
|
|
|
|
pushf
|
|
Message msgCrlf
|
|
popf
|
|
else
|
|
clc
|
|
endif ;OPKBLD
|
|
|
|
jnc OkToFormatHardDisk
|
|
mov ExitStatus, EXIT_NO
|
|
jmp ExitProgram
|
|
|
|
OkToFormatHardDisk:
|
|
call CrLf
|
|
call CrLf
|
|
return
|
|
|
|
; Got a DblSpaced drive--see if it's removable or not.
|
|
|
|
MaybeDblSpace:
|
|
mov AX, (IOCTL shl 8) or IOCTL_CHANGEABLE?
|
|
mov bl, DriveToFormat
|
|
inc bl
|
|
int 21H
|
|
jc RealHardDisk ; should not happen, but if it does...
|
|
|
|
or ax, ax ; AX=0 if not removable--quietly exit
|
|
jnz PrmptRet ; in this case, later checks will
|
|
; stop the format process
|
|
GoPrnIt:
|
|
mov AL, DriveToFormat
|
|
call AccessDisk
|
|
Message msgInsertDisk
|
|
Message ContinueMsg
|
|
call USER_STRING ; Wait for any key
|
|
call CrLf
|
|
call CrLf
|
|
|
|
PrmptRet:
|
|
mov fLastChance, FALSE
|
|
ret
|
|
|
|
DskPrm ENDP
|
|
|
|
;=========================================================================
|
|
; CheckError:
|
|
; Input:
|
|
; AX - extended error code
|
|
; Ouput:
|
|
; carry set if error is Fatal
|
|
; Message printed if Not Ready or Write Protect
|
|
;=========================================================================
|
|
|
|
CheckError proc near
|
|
|
|
cmp AX, error_write_protect
|
|
je WriteProtectError
|
|
cmp AX, error_not_ready
|
|
je NotReadyError
|
|
cmp CurrentCylinder, 0
|
|
jne CheckRealErrors
|
|
cmp CurrentHead, 0
|
|
je BadTrackZero
|
|
|
|
CheckRealErrors:
|
|
cmp AX, error_CRC
|
|
je JustABadTrack
|
|
cmp AX, error_sector_not_found
|
|
je JustABadTrack
|
|
cmp AX, error_write_fault
|
|
je JustABadTrack
|
|
cmp AX, error_read_fault
|
|
je JustABadTrack
|
|
cmp AX, error_gen_failure
|
|
je JustABadTrack
|
|
|
|
stc
|
|
ret
|
|
|
|
JustABadTrack:
|
|
clc
|
|
ret
|
|
|
|
WriteProtectError:
|
|
test SwitchMap,Switch_SELECT ; SELECT option?
|
|
jnz $$IF56 ; no - display messages
|
|
|
|
Message msgCrLf
|
|
Message msgCrLf
|
|
Extended_Message
|
|
jmp SHORT $$EN56 ; yes - set error level
|
|
|
|
$$IF56:
|
|
mov ExitStatus,EXIT_WRIT_PROTECT ; signal write protect error
|
|
|
|
$$EN56:
|
|
stc ; signal Fatal error
|
|
ret ; return to caller
|
|
|
|
NotReadyError:
|
|
test SwitchMap,Switch_SELECT ; SELECT option?
|
|
jnz $$IF59 ; no - display messages
|
|
|
|
Message msgCrLf
|
|
Message msgCrLf
|
|
Extended_Message
|
|
jmp SHORT $$EN59 ; yes - set error level
|
|
|
|
$$IF59:
|
|
mov ExitStatus,EXIT_DRV_NOT_READY ;signal Drive not ready
|
|
|
|
$$EN59:
|
|
stc
|
|
ret
|
|
|
|
BadTrackZero:
|
|
Message msgDiskUnusable
|
|
stc
|
|
ret
|
|
|
|
CheckError endp
|
|
|
|
;=========================================================================
|
|
;
|
|
; Calc_MAX_Tracks_To_Format : This routine determines the maximum
|
|
; number of tracks to format at 1 time.
|
|
;
|
|
; Inputs : DeviceParameters - SectorsPerTrack
|
|
; BytesPerSector
|
|
;
|
|
; Outputs : Track_Count - MAX. # of tracks to format in 1 call
|
|
; to FormatTrack
|
|
;=========================================================================
|
|
|
|
Procedure Calc_Max_Tracks_To_Format
|
|
|
|
push AX ; Save regs
|
|
push BX
|
|
push DX
|
|
|
|
mov AX,DeviceParameters.DP_BPB.oldBPB.BPB_SectorsPerTrack
|
|
mov BX,DeviceParameters.DP_BPB.oldBPB.BPB_BytesPerSector
|
|
.errnz EDP_BPB NE DP_BPB
|
|
xor DX,DX
|
|
mul BX ; Get total byte count
|
|
mov BX,AX ; Put count in BX
|
|
mov ax, 1
|
|
or dx, dx
|
|
jnz cmttf_onetrack
|
|
mov AX,MAX_Format_Size ; Max bytes to format
|
|
div BX ; Get track count
|
|
cmttf_onetrack:
|
|
mov Track_Count,AX
|
|
|
|
pop DX
|
|
pop BX
|
|
pop AX
|
|
|
|
ret
|
|
|
|
Calc_Max_Tracks_To_Format ENDP
|
|
|
|
;=========================================================================
|
|
; Format_Loop : This routine provides the main template
|
|
; for the formatting of a disk. A disk
|
|
; will be formatted as long as there are
|
|
; tracks remaining to be formatted.
|
|
; This routine can be exited on a carry
|
|
; condition; i.e., bad track, last track, etc.
|
|
;
|
|
; Inputs : none
|
|
;
|
|
; Outputs : CY - Set on exit from this routine
|
|
; AX - Possible error condition code
|
|
;
|
|
;=========================================================================
|
|
|
|
Procedure Format_Loop
|
|
|
|
clc ; Initialize to NC
|
|
|
|
$$DO173: ; While NC
|
|
jc $$EN173 ; Exit on CY
|
|
call Calc_Current_Head_Cyl ; Head and cylinder calc.
|
|
call Determine_Format_Type ; Floppy/hard media?
|
|
call Determine_Track_Count ; How many tracks?
|
|
call FormatTrack ; Format track(s)
|
|
jnc $$IF175 ; Formattrack failed
|
|
|
|
pushf ; Save flags
|
|
cmp DeviceParameters.DP_DeviceType,Dev_HardDisk ; Harddisk?
|
|
.errnz EDP_DEVICETYPE NE DP_DEVICETYPE
|
|
jne $$IF176
|
|
|
|
popf ; Restore flags
|
|
call Format_Track_Retry ; Find failing track
|
|
jmp SHORT $$EN176
|
|
|
|
$$IF176:
|
|
popf ; Restore flags
|
|
|
|
$$EN176:
|
|
$$IF175:
|
|
jnc $$IF180 ; Format error?
|
|
pushf ; Yes - save flags
|
|
push AX ; Save return code
|
|
call CheckRealErrors ; Check error type
|
|
jc $$IF181 ; If non-Fatal
|
|
call DisplayCurrentTrack ; Display % formatted
|
|
|
|
$$IF181:
|
|
pop AX ; Restore regs
|
|
popf
|
|
|
|
$$IF180:
|
|
jc $$EN173 ; Exit on CY
|
|
|
|
call DisplayCurrentTrack ; Tell how much formatted
|
|
call Adj_Track_Count ; Decrease track counter
|
|
call NextTrack ; Adjust head and cylinder
|
|
jmp SHORT $$DO173
|
|
|
|
$$EN173:
|
|
ret
|
|
|
|
Format_Loop ENDP
|
|
|
|
;=========================================================================
|
|
; Calc_Current_Head_Cyl : Obtain the current head and cylinder of the
|
|
; track being formatted.
|
|
;
|
|
; Inputs: FP_Cylinder - Cylinder of track being formatted
|
|
; FP_Head - Head of track being formatted
|
|
;=========================================================================
|
|
|
|
Procedure Calc_Current_Head_Cyl
|
|
|
|
push CX ; save CX
|
|
mov CX,FormatPacket.FP_Cylinder ; get current cylinder
|
|
mov CurrentCylinder,CX ; put into variable
|
|
mov CX,FormatPacket.FP_Head ; get current head
|
|
mov CurrentHead,CX ; put into variable
|
|
pop CX ; restore CX
|
|
ret
|
|
|
|
Calc_Current_Head_Cyl endp
|
|
|
|
; =========================================================================
|
|
; Determine_Format_Type : This routine determines the type of format
|
|
; that is to occur based on the media type.
|
|
;
|
|
; Inputs : Dev_HardDisk - Media type (harddisk)
|
|
; Multi_Track_Format - EQU 02h
|
|
; Single_Track_Format - EQU 00h
|
|
;
|
|
; Outputs : FP_SpecialFunctions - Set appropriately for single
|
|
; or multi track format
|
|
; =========================================================================
|
|
|
|
Procedure Determine_Format_Type
|
|
|
|
cmp DeviceParameters.DP_DeviceType,Dev_HardDisk ;harddisk?
|
|
.errnz EDP_DEVICETYPE NE DP_DEVICETYPE
|
|
jne $$IF158
|
|
; Set for multi track format
|
|
mov FormatPacket.FP_SpecialFunctions,Multi_Track_Format
|
|
jmp SHORT $$EN158
|
|
|
|
$$IF158: ; Set for single track format
|
|
mov FormatPacket.FP_SpecialFunctions,Single_Track_Format
|
|
|
|
$$EN158:
|
|
ret
|
|
|
|
Determine_Format_Type ENDP
|
|
|
|
;=========================================================================
|
|
;
|
|
; Determine_Track_Count : This routine determines the number of
|
|
; tracks to be formatted, based on whether
|
|
; or not we have a hard disk. If we have
|
|
; a hard disk we can use multi-track
|
|
; format/verify, otherwise we use the
|
|
; single track format/verify.
|
|
;
|
|
; Inputs : Device_Type - Media type
|
|
;
|
|
; Outputs : Tracks_To_Format - MAX. number of tracks
|
|
; to be formatted in one
|
|
; call
|
|
;=========================================================================
|
|
|
|
Procedure Determine_Track_Count
|
|
|
|
; Harddisk?
|
|
cmp DeviceParameters.DP_DeviceType,Dev_HardDisk
|
|
.errnz EDP_DEVICETYPE NE DP_DEVICETYPE
|
|
jne $$IF163
|
|
call Calc_Track_Count ; Calc Tracks_To_Format
|
|
jmp SHORT $$EN163 ; Removable media
|
|
|
|
$$IF163:
|
|
mov Tracks_To_Format,0001h ; Default to 1 track
|
|
$$EN163:
|
|
|
|
ret
|
|
|
|
Determine_Track_Count ENDP
|
|
|
|
;=========================================================================
|
|
;
|
|
; Calc_Track_Count : This routine determines if we have enough tracks
|
|
; remaining to use the Max. number of tracks
|
|
; in the FormatTrack call. If the tracks remaining
|
|
; to be formatted is less that the mAX. number of
|
|
; allowable tracks for the call, the mAX. number
|
|
; of allowable tracks is set to the remaining track
|
|
; count.
|
|
;
|
|
; Inputs : Track_Count - MAX. number of allowable tracks to be
|
|
; formatted in 1 FormatTrack call.
|
|
; TracksLeft - Track count of remaining tracks to be
|
|
; formatted.
|
|
;
|
|
; Outputs : Tracks_To_Format - Count of the tracks to be formatted
|
|
; in the next FormatTrack call.
|
|
;
|
|
;=========================================================================
|
|
|
|
Procedure Calc_Track_Count
|
|
|
|
push AX ; Save regs
|
|
|
|
mov AX,Track_Count ; Max bytes to format
|
|
|
|
cmp word ptr TracksLeft+2,0 ; M018; More than 64K of tracks?
|
|
jnz $$IF166 ; M018; Then surely use Track_Count
|
|
|
|
cmp AX,word ptr TracksLeft ; M018; Too many tracks?
|
|
JNA $$IF166
|
|
mov AX,word ptr TracksLeft ; M018; Format remaining tracks
|
|
|
|
$$IF166:
|
|
mov Tracks_To_Format,AX ; Save track count
|
|
pop AX
|
|
ret
|
|
|
|
Calc_Track_Count ENDP
|
|
|
|
;=========================================================================
|
|
; FormatTrack : This routine performs multi track or single
|
|
; track formatting based on the state of the
|
|
; SpecialFunctions byte.
|
|
;
|
|
; Inputs : Tracks_To_Format - # of tracks to format in 1 call
|
|
; FormatPacket - Parms for IOCTL call
|
|
;
|
|
; Outputs : NC - formatted track(s)
|
|
; CY - error in format
|
|
; AX - extended error on CY
|
|
;
|
|
;=========================================================================
|
|
|
|
|
|
Procedure FormatTrack
|
|
|
|
mov AX,(IOCTL shl 8) or Generic_IOCTL
|
|
mov BL,DriveToFormat ; Get Drive number
|
|
inc BL ; Make it 1 based
|
|
|
|
mov CX,(RawIO shl 8)
|
|
cmp IsEXTRAWIODrv,0
|
|
je DoFrmt2
|
|
mov CX,(EXTRawIO shl 8)
|
|
DoFrmt2:
|
|
or CL,Track_Action ; Track_Action is either
|
|
; Format and Verify, or
|
|
; Verify only
|
|
mov DX,Tracks_To_Format ; Get track count
|
|
mov FormatPacket.FP_TrackCount,DX ; Put count in parms list
|
|
lea DX,FormatPacket ; Ptr to parms
|
|
int 21h
|
|
|
|
;;%out FORQUICK ENABLED!!!!!
|
|
;; clc ;;** ARR
|
|
|
|
jnc FormatTrackExit ; Error?
|
|
mov AH,59h ; Get extended error
|
|
xor BX,BX ; Clear BX
|
|
int 21h
|
|
|
|
cmp AX,67 ; Induced error from ENHDISK?
|
|
jne notInducedError
|
|
clc
|
|
ret
|
|
notInducedError:
|
|
stc ; Flag an error
|
|
|
|
FormatTrackExit:
|
|
ret
|
|
|
|
FormatTrack ENDP
|
|
|
|
;=========================================================================
|
|
;
|
|
; Format_Track_Retry : This routine performs the retry logic for
|
|
; the format multi-track. It will retry each track
|
|
; until the failing track is encountered through
|
|
; a CY condition.
|
|
;
|
|
; Inputs : none
|
|
;
|
|
; Outputs : CY - indicates either a failing track or end of format
|
|
;
|
|
;
|
|
;=========================================================================
|
|
|
|
Procedure Format_Track_Retry
|
|
|
|
clc ; Clear existing CY
|
|
mov Tracks_To_Format,1 ; Only format 1 track
|
|
|
|
$$DO168: ; While we have good tracks
|
|
jc $$EN168 ; Exit on bad track
|
|
|
|
call FormatTrack ; Format the track
|
|
jc $$IF170 ; Error?
|
|
|
|
call DisplayCurrentTrack ; Adjust percent counter
|
|
call Adj_Track_Count
|
|
call NextTrack ; Calc next track
|
|
|
|
$$IF170:
|
|
jmp SHORT $$DO168
|
|
|
|
$$EN168:
|
|
ret
|
|
|
|
Format_Track_Retry ENDP
|
|
|
|
;=========================================================================
|
|
;
|
|
; DisplayCurrentTrack : This procedure prints the percentage of disk
|
|
; formatted so far.
|
|
; If /select is present, format can be exited
|
|
; by returning AX!=0 from the int 2fh call, which
|
|
; is handled by install. This is to permit the
|
|
; user to stop the format in progress.
|
|
;
|
|
;===========================================================================
|
|
|
|
DisplayCurrentTrack proc near
|
|
|
|
push DX
|
|
push CX
|
|
push AX
|
|
|
|
push DI ; M018
|
|
push SI ; M018
|
|
|
|
mov AX,Tracks_To_Format ;get track count
|
|
|
|
add Formatted_Tracks_Low,AX ;Indicate formatted a track
|
|
adc Formatted_Tracks_High,0
|
|
mov AX,Formatted_Tracks_Low
|
|
mov BX,Formatted_Tracks_High
|
|
mov CX,100 ;Make integer calc for div
|
|
call Multiply_32_Bits ; BX:AX = (Cyl * Head *100)
|
|
mov DX,BX ;Set up divide
|
|
|
|
; DX:AX: 100*head*cylinder (should not be bigger than a DWORD)
|
|
; DI:SI: heads*cylinder
|
|
; We need to assure a word division
|
|
|
|
mov DI,word ptr TracksPerDisk+2
|
|
mov SI,word ptr TracksPerDisk
|
|
SetUpDivide:
|
|
or DI,DI
|
|
jz DivideOK
|
|
shr DI,1 ; shift DI:SI 1 bit right
|
|
rcr SI,1
|
|
shr DX,1 ; shift DX:AX 1 bit right
|
|
rcr AX,1
|
|
jmp short SetUpDivide
|
|
DivideOk:
|
|
div SI
|
|
|
|
cmp AX,PercentComplete ;Only print message when change
|
|
je ScreenUpdateDone
|
|
|
|
; johnhe 02-27-90
|
|
; Change added here for DOS 5.0 install program to do a
|
|
; special interrupt to display the percent complete on
|
|
; a gage. AX == special code, BX == percent complete
|
|
|
|
test SwitchMap,Switch_Select ; Was format spawned by the
|
|
jz NormalDisplay ; install program?
|
|
mov BX,AX ; BX == percent completed
|
|
mov AX,GAGE_UPDATE ; AX == special function code
|
|
clc
|
|
int 2fh ; Multiplex interrupt
|
|
or AX,AX ; AX <> 0 --> user wants to exit
|
|
jz ScreenUpdateDone
|
|
jmp FatalExit
|
|
|
|
; End of code added for DOS 5.0 install program
|
|
|
|
NormalDisplay:
|
|
mov PercentComplete,AX ; Save it if changed
|
|
Message msgCurrentTrack
|
|
|
|
ScreenUpdateDone:
|
|
pop SI ; M018
|
|
pop DI ; M018
|
|
|
|
pop AX
|
|
pop CX ; Restore register
|
|
pop DX
|
|
return
|
|
|
|
DisplayCurrentTrack endp
|
|
|
|
;=========================================================================
|
|
; Adj_Track_Count : This routine adjusts the track count by the
|
|
; number of tracks that have been formatted
|
|
; in one FormatTrack call.
|
|
;
|
|
; Inputs : TracksLeft - # of tracks remaining to be formatted
|
|
; Tracks_To_Format - Tracks formatted in 1 call
|
|
;
|
|
; Outputs : TracksLeft - # of tracks remaining to be formatted
|
|
;=========================================================================
|
|
|
|
Procedure Adj_Track_Count
|
|
|
|
push AX ; save regs
|
|
push DX ; M018
|
|
|
|
mov DX,word ptr TracksLeft+2; get tracks remaining
|
|
mov AX,word ptr TracksLeft
|
|
|
|
sub AX,Tracks_To_Format ; subtract amount formatted
|
|
sbb DX,0
|
|
|
|
mov word ptr TracksLeft,AX ; save new tracks remaining value
|
|
mov word ptr TracksLeft+2,DX
|
|
|
|
pop DX ; M018
|
|
pop AX ; restore regs
|
|
ret
|
|
|
|
Adj_Track_Count endp
|
|
|
|
;=========================================================================
|
|
;
|
|
; NextTrack : This routine determines the next track to be
|
|
; formatted.
|
|
;
|
|
; Inputs : TracksLeft - # of tracks remaining
|
|
; Tracks_To_Format - # of tracks to format in 1 call
|
|
; FP_Head - disk head
|
|
; FP_Cylinder - disk cylinder
|
|
;
|
|
; Outputs : TracksLeft - # of tracks remaining
|
|
; FP_Head - disk head
|
|
; FP_Cylinder - disk cylinder
|
|
; CY - no tracks left to format
|
|
; NC - tracks left to format
|
|
;
|
|
;=========================================================================
|
|
|
|
Procedure NextTrack
|
|
|
|
|
|
mov CX,word ptr TracksLeft+2
|
|
or CX,Word ptr TracksLeft
|
|
jne $$IF149 ; Yes
|
|
|
|
stc ; Signal end of format
|
|
mov Format_End,True
|
|
jmp SHORT $$EN149
|
|
|
|
$$IF149:
|
|
mov CX,Tracks_To_Format ; Get mAX track count for call
|
|
|
|
$$DO151: ; While tracks remain
|
|
cmp CX,00 ; End of head/cyl. adjustment?
|
|
je $$EN151 ; Yes
|
|
|
|
inc FormatPacket.FP_Head ; Next head
|
|
mov AX,FormatPacket.FP_Head ; Get head for comp
|
|
cmp AX,DeviceParameters.DP_BPB.oldBPB.BPB_Heads ; Exceeded head count?
|
|
.errnz EDP_BPB NE DP_BPB
|
|
jne $$IF154 ; Yes
|
|
|
|
mov FormatPacket.FP_Head,00 ; Reinit. head
|
|
inc FormatPacket.FP_Cylinder ; Next cylinder
|
|
|
|
$$IF154:
|
|
dec CX ; Decrease counter
|
|
jmp SHORT $$DO151
|
|
|
|
$$EN151:
|
|
clc ; Clear CY
|
|
|
|
$$EN149:
|
|
ret
|
|
|
|
NextTrack ENDP
|
|
|
|
;=========================================================================
|
|
; CurrentLogicalSector:
|
|
; Get the current logical sector number
|
|
;
|
|
; Input:
|
|
; current track = TracksPerDisk - TracksLeft
|
|
; SectorsPerTrack
|
|
;
|
|
; Output:
|
|
; BX = logical sector number of the first sector in the track we
|
|
; just tried to format
|
|
;=========================================================================
|
|
|
|
CurrentLogicalSector PROC NEAR
|
|
|
|
push AX ; Save regs
|
|
push BX
|
|
push DX
|
|
.386
|
|
mov EAX, TracksPerDisk
|
|
sub EAX, TracksLeft
|
|
movzx ebx, DeviceParameters.DP_BPB.oldBPB.BPB_SectorsPerTrack
|
|
.errnz EDP_BPB NE DP_BPB
|
|
mul ebx
|
|
mov dword ptr Relative_Sector_Low,EAX ; Save sector #
|
|
.8086
|
|
pop DX ; Restore regs
|
|
pop BX
|
|
pop AX
|
|
|
|
return
|
|
|
|
CurrentLogicalSector ENDP
|
|
|
|
;=========================================================================
|
|
;
|
|
; BadSector:
|
|
; Reports the bad Sectors.
|
|
; Reports the track where DiskFormat stopped.
|
|
; From then on it formats until it reaches a bad track, or end,
|
|
; and reports that.
|
|
;
|
|
; Output:
|
|
; Carry: set --> Fatal error
|
|
; if Carry not set
|
|
; AX - The number of consecutive bad Sectors encountered
|
|
; AX == 0 --> no More bad Sectors
|
|
; BX - The logical sector number of the first bad sector
|
|
;
|
|
; Algorithm:
|
|
; if DiskFormatErrors
|
|
; DiskFormatErrors = false
|
|
; return current track
|
|
; else
|
|
; next track
|
|
; while not done
|
|
; if format track fails
|
|
; return current track
|
|
; next track
|
|
; return 0
|
|
;=========================================================================
|
|
|
|
BadSector proc near
|
|
; Don't bother to do the format
|
|
; /c was given
|
|
test FormatError, 0ffH
|
|
jz ContinueFormat
|
|
|
|
mov FormatError, 0
|
|
jmp SHORT ReportBadTrack
|
|
|
|
ContinueFormat:
|
|
call Adj_Track_Count ; Decrease track counter
|
|
call NextTrack ; Adjust head and cylinder
|
|
cmp Format_End,True ; End of format?
|
|
je $$IF44 ; No
|
|
|
|
call Format_Loop ; Format until CY
|
|
cmp Format_End,True ; End of format?
|
|
je $$IF45 ; No
|
|
|
|
call CheckError ; Must be error - which error?
|
|
jc $$IF46 ; Non-Fatal error?
|
|
|
|
call CurrentLogicalSector ; Yes - get position
|
|
; set tracksize
|
|
mov AX,DeviceParameters.DP_BPB.oldBPB.BPB_SectorsPerTrack
|
|
.errnz EDP_BPB NE DP_BPB
|
|
clc ; Signal O.K. to continue
|
|
|
|
$$IF46:
|
|
jmp SHORT $$EN45
|
|
$$IF45:
|
|
jmp SHORT NoMoreTracks ;End of format
|
|
$$EN45:
|
|
jmp SHORT $$EN44
|
|
$$IF44:
|
|
jmp SHORT NoMoreTracks ; end of format
|
|
$$EN44:
|
|
return
|
|
|
|
ReportBadTrack:
|
|
call CurrentLogicalSector
|
|
mov AX, DeviceParameters.DP_BPB.oldBPB.BPB_SectorsPerTrack
|
|
clc
|
|
return
|
|
|
|
NoMoreTracks: ; Don't display done msg
|
|
test SwitchMap,(Switch_Select or SWITCH_AUTOtest)
|
|
jnz $$IF52 ; if EXEC'd by SELECT
|
|
Message msgFormatComplete
|
|
|
|
$$IF52:
|
|
mov AX, 0
|
|
clc
|
|
return
|
|
|
|
BadSector endp
|
|
|
|
;=========================================================================
|
|
; Get_Bad_Sector_Hard : Determine the bad sector.
|
|
;
|
|
; Inputs :
|
|
; Head of failing track
|
|
; Cylinder of failing track
|
|
; Relative_Sector_Low - 1st. sector in track
|
|
; Relative_Sector_High
|
|
;
|
|
; ClustBound_Adj_Factor - The number of Sectors
|
|
; that are to be read
|
|
; at one time.
|
|
; ClustBound_SPT_Count - Used by Calc_Cluster_Boundary
|
|
; to track how many Sectors
|
|
; have been read.
|
|
; ClustBound_Flag - True (Use cluster buffer)
|
|
; - False (Use internal buffer)
|
|
; ClustBound_Buffer_Seg - Segment of buffer
|
|
;
|
|
; Outputs : Marked cluster as bad
|
|
;=========================================================================
|
|
|
|
Procedure Get_Bad_Sector_Hard
|
|
|
|
push CX ; Save CX
|
|
mov CX,0001h ; Set counter to start at 1
|
|
mov ClustBound_SPT_Count,00h ; Clear sector counter
|
|
mov ClustBound_Adj_Factor,01h ; Default value
|
|
|
|
; DO WHILE Sectors left
|
|
$$DO115:
|
|
cmp CX,DeviceParameters.DP_BPB.oldBPB.BPB_SectorsPerTrack ;At end?
|
|
.errnz EDP_BPB NE DP_BPB
|
|
ja $$EN115 ; Yes,exit
|
|
push CX ; Save CX
|
|
|
|
cmp ClustBound_Flag,True ; Full buffer there?
|
|
jne $$IF117 ; Yes
|
|
call Calc_ClustBound_ ; See if on boundary
|
|
mov AX,ClustBound_Buffer_Seg
|
|
; Point to transfer area
|
|
mov WORD PTR RWPacket.TRWP_Transferaddress[0],0
|
|
mov WORD PTR RWPacket.TRWP_Transferaddress[2],AX
|
|
jmp SHORT $$EN117 ; Default to internal buffer
|
|
|
|
$$IF117: ; Point to transfer area
|
|
mov WORD PTR RWPacket.TRWP_Transferaddress[0],offset RW_TRF_Area
|
|
mov WORD PTR RWPacket.TRWP_Transferaddress[2],DS
|
|
|
|
$$EN117:
|
|
call Verify_Structure_Set_Up ; Set up verify vars
|
|
mov AX,(IOCTL shl 8) or GENERIC_IOCTL
|
|
xor BX,BX ; Clear BX
|
|
mov BL,DriveToFormat ; Get Drive
|
|
inc BL ; Adjust it
|
|
|
|
mov CX,(IOC_DC shl 8) or READ_TRACK
|
|
cmp IsEXTRAWIODrv,0
|
|
je DoIOCTL2
|
|
mov CX,(IOC_EDC shl 8) or READ_TRACK
|
|
; Buffer is only cluster size
|
|
DoIOCTL2:
|
|
lea DX,RWPacket ; Point to parms
|
|
int 21h
|
|
|
|
pop CX ; Restore CX
|
|
push CX ; Save CX
|
|
|
|
jnc $$IF120 ; An error occurred
|
|
call Calc_Cluster_Position ; Determine which cluster
|
|
call BadClus ; Mark the cluster as bad
|
|
|
|
$$IF120:
|
|
pop CX
|
|
add CX,ClustBound_Adj_Factor ; Adjust loop counter
|
|
mov AX,ClustBound_Adj_Factor ; Get adjustment factor
|
|
xor DX,DX
|
|
add AX,Relative_Sector_Low ; Add in low word
|
|
adc DX,Relative_Sector_High ; Pick up carry in high word
|
|
mov Relative_Sector_Low,AX ; Save low word
|
|
mov Relative_Sector_High,DX ; Save high word
|
|
jmp SHORT $$DO115
|
|
|
|
$$EN115:
|
|
pop CX
|
|
ret
|
|
|
|
Get_Bad_Sector_Hard ENDP
|
|
|
|
;=========================================================================
|
|
; Get_Bad_Sector_Floppy : This routine marks an entire track as bad
|
|
; since it is a floppy disk.
|
|
;
|
|
; Inputs : Relative_Sector_Low - first sector
|
|
;
|
|
; Outputs : Fat marked with bad Sectors
|
|
;=========================================================================
|
|
|
|
Procedure Get_Bad_Sector_Floppy
|
|
|
|
push BX ; Save regs
|
|
push CX
|
|
; Get Sectors/track
|
|
mov CX,DeviceParameters.DP_BPB.oldBPB.BPB_SectorsPerTrack
|
|
.errnz EDP_BPB NE DP_BPB
|
|
|
|
$$DO123: ; While Sectors left
|
|
cmp CX,00 ; At end
|
|
je $$EN123 ; Yes
|
|
|
|
push BX ; Save BX we destroy it
|
|
push CX ; Save CX we destroy it
|
|
call Calc_Cluster_Position ; Get cluster position
|
|
call BadClus ; Mark it as bad
|
|
pop CX ; Restore regs
|
|
pop BX
|
|
dec CX ; Decrease loop counter
|
|
.386
|
|
inc dword ptr Relative_Sector_Low ; Next sector
|
|
.8086
|
|
jmp SHORT $$DO123
|
|
|
|
$$EN123:
|
|
pop CX ; Restore regs
|
|
pop BX
|
|
ret
|
|
|
|
Get_Bad_Sector_Floppy ENDP
|
|
|
|
;=========================================================================
|
|
;
|
|
; Inputs: DX:AX - Cluster number
|
|
; Outputs: The given cluster is marked as invalid
|
|
; Zero flag is set if the cluster was already marked bad
|
|
;
|
|
; Registers modified: DX
|
|
; SI
|
|
;
|
|
; BADCLUS : Marks off a bad cluster in the Fat
|
|
; If a cluster has already been marked bad it
|
|
; will return with ZR.
|
|
;
|
|
; Inputs : DX:AX - Cluster Number
|
|
;
|
|
; Outputs : Cluster is marked invalid
|
|
; ZR set if cluster already marked bad
|
|
;
|
|
;=========================================================================
|
|
|
|
BadClus proc near ; mark bad clusters
|
|
|
|
push DI ; save affected regs
|
|
push AX
|
|
push BX
|
|
push CX
|
|
push DX
|
|
push ES
|
|
|
|
cmp FATNotAllInMem,0
|
|
je DoBadInMem
|
|
push dx ; Save cluster number
|
|
push ax
|
|
call AllocInitBadClusBitmap ; Does nothing if BadClusBitmap
|
|
; already exists
|
|
.386
|
|
;; Manual assemble to prevent compile warning
|
|
;; pop eax ; recover cluster #
|
|
db 066h,058h
|
|
;;
|
|
jc $$EN10
|
|
push ds
|
|
push si
|
|
lds si,BadClusBitMap
|
|
mov ebx,eax
|
|
shr ebx,19 ; (E)BX is "64k index" of this bit
|
|
and eax,00007FFFFh ; bit index in that 64k
|
|
mov cx,ds
|
|
add cx,bx ; Go to correct 64k piece
|
|
mov ds,cx
|
|
bts dword ptr [si],eax ; Set the bit
|
|
pop si
|
|
pop ds
|
|
jnc short ClrZr
|
|
xor ax,ax ; Set zero flag, cluster already marked
|
|
jmp $$EN10
|
|
|
|
ClrZr:
|
|
inc eax ; Clear the zero flag
|
|
.8086
|
|
jmp $$EN10
|
|
|
|
DoBadInMem:
|
|
mov ES, WORD PTR FatSpace + 2 ; obtain seg of Fat
|
|
|
|
cmp fBig32Fat,TRUE ; 32 bit Fat?
|
|
je $$IF8a ; yes
|
|
cmp fBigFat,TRUE ; 16 bit Fat?
|
|
je $$IF8 ; yes
|
|
|
|
; 12-bit FAT
|
|
|
|
mov CX,2 ; divide by 2
|
|
|
|
push AX ; saves low cluster number
|
|
mov SI,DX ; pick up high word of cluster
|
|
mov DI,AX ; pick up low word of cluster
|
|
call divide_32_Bits ; 32 bit divide
|
|
|
|
add AX,DI ; add in low word of result
|
|
adc DX,SI ; pick up low word carry
|
|
; cluster = cluster * 1.5
|
|
add AX,WORD PTR FatSpace ; add 0
|
|
adc DX,0 ; pick up carry
|
|
|
|
mov BX,DX ; get high word for adjust
|
|
mov CX,ES ; place seg in AX
|
|
call BadClus_address_Adjust ; adjust segment offset
|
|
mov ES,CX ; new segment
|
|
mov SI,AX ; new offset
|
|
|
|
mov DX,0ff7h ; bad cluster flag
|
|
mov AX,0fffh ; mask value
|
|
|
|
pop CX ; restore AX in CX - low cluster #
|
|
test CX,1 ; is old clus num odd?
|
|
jz $$IF9 ; yes
|
|
.386
|
|
shl AX,4 ; get only 12 bits - fff0
|
|
shl DX,4 ; get 12 bits - ff70
|
|
.8086
|
|
$$IF9:
|
|
jmp SHORT $$EN8
|
|
|
|
$$IF8a:
|
|
; 32-bit FAT
|
|
xor SI,SI ; clear si
|
|
mov BX,DX ; get high word for multiply
|
|
mov CX,4 ; multiply by 4
|
|
call Multiply_32_Bits ; 32 bit multiply due to 4 bytes per
|
|
; Fat cell. This gives us an offset
|
|
; into the FAT
|
|
mov CX,ES ; place seg in CX
|
|
call BadClus_Address_Adjust ; adjust segment:offset
|
|
mov ES,CX ; new segment
|
|
mov SI,AX ; new offset
|
|
.386
|
|
mov ecx,dword ptr ES:[SI] ; Get previous value
|
|
and ecx,00FFFFFFFh ; Discard high 4 bits
|
|
mov edx,00ffffff7h
|
|
mov dword ptr ES:[SI],edx ; flag it a bad cluster
|
|
cmp EDX,ECX ; return op == badval;
|
|
.8086
|
|
jmp short $$EN10
|
|
|
|
$$IF8:
|
|
; 16-bit FAT
|
|
xor SI,SI ; clear si
|
|
mov BX,DX ; get high word for multiply
|
|
mov CX,2 ; multiply by 2
|
|
call Multiply_32_Bits ; 32 bit multiply due to 2 bytes per
|
|
; Fat cell. This gives us an offset
|
|
; into the FAT
|
|
|
|
mov CX,ES ; place seg in CX
|
|
call BadClus_Address_Adjust ; adjust segment:offset
|
|
mov ES,CX ; new segment
|
|
mov SI,AX ; new offset
|
|
|
|
mov DX,0fff7h ; bad cluster value
|
|
mov AX,0ffffh ; mask value
|
|
|
|
$$EN8:
|
|
mov CX,ES:[SI] ; get contents of Fat cell
|
|
and CX,AX ; make it 12 or 16 bit
|
|
; depending on value in AX
|
|
not AX ; set AX to 0
|
|
|
|
and ES:[SI],AX ; clear Fat entry
|
|
|
|
or ES:[SI],DX ; flag it a bad cluster
|
|
cmp DX,CX ; return op == badval;
|
|
$$EN10:
|
|
pop ES
|
|
pop DX
|
|
pop CX
|
|
pop BX
|
|
pop AX
|
|
pop DI
|
|
return
|
|
|
|
badclus endp
|
|
|
|
;=========================================================================
|
|
; Verify_Structure_Set_Up : Set up the fields for the Read IOCTL
|
|
; to verify the Sectors in a failing
|
|
; track. Also, it displays the
|
|
; message notifying the user of the
|
|
; Sectors it is verifying.
|
|
;=========================================================================
|
|
|
|
Procedure Verify_Structure_Set_Up ; Set up verify structure
|
|
|
|
mov RWPacket.TRWP_SpecialFunctions,00h ; Reset special functions
|
|
|
|
mov AX,FormatPacket.FP_Head ; Get current head
|
|
mov RWPacket.TRWP_Head,AX ; Get current head
|
|
|
|
mov AX,FormatPacket.FP_Cylinder ; Get current cylinder
|
|
mov RWPacket.TRWP_Cylinder,AX ; Get current cylinder
|
|
|
|
dec CX ; Make sector 0 based
|
|
mov RWPacket.TRWP_FirstSector,CX ; Get sector to read
|
|
|
|
mov AX,ClustBound_Adj_Factor ; Get # of Sectors to read
|
|
mov RWPacket.TRWP_SectorsToReadWrite,AX ; Read only # sector(s)
|
|
|
|
call Calc_Cluster_Position ; Determine cluster number
|
|
mov WORD PTR Msg_Allocation_Unit_Val[+2],DX ; Save high word of cluster
|
|
mov WORD PTR Msg_Allocation_Unit_Val[+0],AX ; Save low word of cluster
|
|
message msgVerify
|
|
|
|
ret
|
|
|
|
Verify_Structure_Set_Up ENDP
|
|
|
|
;=========================================================================
|
|
; Calc_Cluster_Position : This routine calculates which cluster the
|
|
; failing sector falls in.
|
|
;
|
|
; Inputs : Relative_Sector_High - high word of sector position
|
|
; Relative_Sector_Low - low word of sector position
|
|
;
|
|
; Outputs : DX:AX - Cluster number
|
|
;=========================================================================
|
|
|
|
Procedure Calc_Cluster_Position
|
|
|
|
push CX ; Save regs
|
|
push DI
|
|
push SI
|
|
|
|
mov DX,WORD PTR Relative_Sector_High ; Get the high sector word
|
|
mov AX,WORD PTR Relative_Sector_Low ; Get the low sector word
|
|
sub AX,word ptr StartSector ; Get relative sector #
|
|
sbb DX,word ptr StartSector+2 ; Pick up borrow
|
|
|
|
mov SI,DX ; Get high word
|
|
mov DI,AX ; Get low word
|
|
xor CX,CX ; Clear CX
|
|
; Get Sectors/cluster
|
|
mov CL,DeviceParameters.DP_BPB.oldBPB.BPB_SectorsPerCluster
|
|
.errnz EDP_BPB NE DP_BPB
|
|
call divide_32_Bits ; 32 bit division
|
|
|
|
mov DX,SI ; Get high word of result
|
|
mov AX,DI ; Get low word of result
|
|
add AX,2 ; Adjust for cluster bias
|
|
adc DX,0 ; Pick up carry
|
|
|
|
pop SI ; Restore regs
|
|
pop DI
|
|
pop CX
|
|
ret
|
|
|
|
Calc_Cluster_Position ENDP
|
|
|
|
;=========================================================================
|
|
; Calc_ClustBound_ : This routine will determine where, within a
|
|
; cluster, a sector resides.
|
|
;
|
|
; Inputs : Relative_Sector_Low - Sector
|
|
; Relative_Sector_High
|
|
;
|
|
; Outputs : ClustBound_Adj_Factor - The number of Sectors
|
|
; remaining in the cluster.
|
|
; ClustBound_SPT_Count - The count of Sectors
|
|
; having been accessed for
|
|
; a track.
|
|
;=========================================================================
|
|
|
|
Procedure Calc_ClustBound_
|
|
|
|
push AX ; Save regs
|
|
push BX
|
|
push CX
|
|
push DX
|
|
push SI
|
|
push DI
|
|
|
|
xor DX,DX ; Clear high word
|
|
mov DX,WORD PTR Relative_Sector_High
|
|
mov AX,WORD PTR Relative_Sector_Low
|
|
sub AX,word ptr StartSector ; Get relative sector #
|
|
sbb DX,word ptr StartSector+2 ; Pick up borrow
|
|
|
|
mov SI,DX ; Get high word
|
|
mov DI,AX ; Get low word
|
|
xor CX,CX ; Clear CX
|
|
mov CL,DeviceParameters.DP_BPB.oldBPB.BPB_SectorsPerCluster
|
|
.errnz EDP_BPB NE DP_BPB
|
|
call divide_32_Bits ; 32 bit division
|
|
|
|
or CX,CX ; See if remainder exists
|
|
jz $$IF132 ; Remainder exists
|
|
|
|
xor BX,BX
|
|
mov BL,DeviceParameters.DP_BPB.oldBPB.BPB_SectorsPerCluster
|
|
sub BX,CX
|
|
mov ClustBound_Adj_Factor,BX ; Remainder = sector count
|
|
jmp SHORT $$EN132 ; Noremainder
|
|
|
|
$$IF132:
|
|
xor BX,BX ; Clear BX
|
|
mov BL,DeviceParameters.DP_BPB.oldBPB.BPB_SectorsPerCluster
|
|
mov ClustBound_Adj_Factor,BX
|
|
|
|
$$EN132:
|
|
|
|
mov AX,ClustBound_SPT_Count ; Get current sector count
|
|
xor DX,DX ; Clear high word
|
|
add AX,ClustBound_Adj_Factor ; Get next sector count
|
|
; Exceeded Sectors/track?
|
|
cmp AX,DeviceParameters.DP_BPB.oldBPB.BPB_SectorsPerTrack
|
|
jna $$IF135 ; Yes
|
|
; only use difference
|
|
mov AX,DeviceParameters.DP_BPB.oldBPB.BPB_SectorsPerTrack
|
|
sub AX,ClustBound_SPT_Count ; Get next sector count
|
|
mov ClustBound_Adj_Factor,AX
|
|
|
|
$$IF135:
|
|
mov AX,ClustBound_SPT_Count ; Get sector count
|
|
xor DX,DX ; Clear high word
|
|
add AX,ClustBound_Adj_Factor ; Get new sector count
|
|
mov ClustBound_SPT_Count,AX ; Save it
|
|
|
|
pop DI ; Restore regs
|
|
pop SI
|
|
pop DX
|
|
pop CX
|
|
pop BX
|
|
pop AX
|
|
|
|
ret
|
|
|
|
Calc_ClustBound_ ENDP
|
|
|
|
;=========================================================================
|
|
;
|
|
; BadClus_address_Adjust - This routine adjusts the segment and
|
|
; offset to provide addressibility into
|
|
; the Fat table.
|
|
;
|
|
; Inputs : BX - high word to adjust segment for
|
|
; AX - low word to adjust segment for
|
|
; CX - segment to be adjusted
|
|
;
|
|
; Outputs : CX - new segment value
|
|
; AX - new offset value
|
|
;
|
|
;=========================================================================
|
|
|
|
Procedure BadClus_address_Adjust
|
|
|
|
push BX ; Save regs
|
|
push DX
|
|
push DI
|
|
push SI
|
|
|
|
mov DX,CX ; Save segment value
|
|
mov SI,BX ; Get high word for divide
|
|
mov DI,AX ; Get low word for divide
|
|
xor CX,CX ; Clear CX
|
|
mov CL,Paragraph_Size ; Divide by 16
|
|
call divide_32_Bits ; Perform division
|
|
|
|
add DX,DI ; Adjust segment for result
|
|
mov AX,CX ; Pick up the remainder
|
|
mov CX,DX ; Pass back new segment
|
|
|
|
pop SI ; Restore regs
|
|
pop DI
|
|
pop DX
|
|
pop BX
|
|
|
|
ret
|
|
|
|
BadClus_address_Adjust ENDP
|
|
|
|
;=========================================================================
|
|
;Routine name: Multiply_32_Bits
|
|
;=========================================================================
|
|
;Description: A real sleazy 32 bit x 16 bit multiply routine. Works by adding
|
|
; the 32 bit number to itself for each power of 2 contained in the
|
|
; 16 bit number. Whenever a bit that is set in the multiplier (CX)
|
|
; gets shifted to the bit 0 spot, it means that that amount has
|
|
; been multiplied so far, and it should be added into the total
|
|
; value. Take the example CX = 12 (1100). Using the associative
|
|
; rule, this is the same as CX = 8+4 (1000 + 0100). The
|
|
; multiply is done on this principle - whenever a bit that is set
|
|
; is shifted down to the bit 0 location, the value in BX:AX is
|
|
; added to the running total in DI:SI. The multiply is continued
|
|
; until CX = 0. The routine will exit with CY set if overflow
|
|
; occurs.
|
|
;
|
|
;
|
|
;Called Procedures: None
|
|
;
|
|
;Change History: Created 7/23/87 MT
|
|
;
|
|
;Input: BX:AX = 32 bit number to be multiplied
|
|
; CX = 16 bit number to be multiplied. (Must be even number)
|
|
;
|
|
;Output: BX:AX = output.
|
|
; CY set if overflow
|
|
;
|
|
;=========================================================================
|
|
|
|
Multiply_32_Bits PROC
|
|
|
|
.386
|
|
push ax
|
|
mov ax,bx
|
|
shl eax,16
|
|
pop ax
|
|
movzx ecx,cx
|
|
mul ecx
|
|
mov ebx,eax
|
|
shr ebx,16
|
|
or edx,edx ; Overflow?
|
|
jz short OkRet ; No, carry clear
|
|
stc
|
|
OkRet:
|
|
.8086
|
|
ret
|
|
|
|
Multiply_32_Bits endp
|
|
|
|
;=========================================================================
|
|
; divide_32_Bits - This routine will perform 32bit division
|
|
; It works by first dividing the high word
|
|
; and leaving the remainder in DX and then
|
|
; dividing the low word with the remainder
|
|
; still in DX
|
|
;
|
|
; Inputs : SI:DI - value to be divided
|
|
; CX - divisor
|
|
;
|
|
; Outputs : SI:DI - result
|
|
; CX - remainder
|
|
;=========================================================================
|
|
|
|
Procedure divide_32_Bits
|
|
|
|
push AX ; Save regs
|
|
push BX
|
|
push DX
|
|
|
|
|
|
xor DX,DX ; clear DX
|
|
mov AX,SI ; get high word
|
|
div CX ; get high word result
|
|
mov SI,AX ; save high word result
|
|
|
|
|
|
mov AX,DI ; get low word
|
|
div CX ; get low word result
|
|
mov DI,AX ; save low word result
|
|
mov CX,DX ; pick up remainder
|
|
|
|
pop DX ; restore regs
|
|
pop BX
|
|
pop AX
|
|
|
|
ret
|
|
|
|
divide_32_Bits endp
|
|
|
|
|
|
;=========================================================================
|
|
;
|
|
; QuickFormat : This procedure will perform a Quick format by
|
|
; simply copying any bad cluster markers from the
|
|
; old FAT on the disk to the new FAT. The old FAT is
|
|
; read in one sector at a time using FatSector buffer.
|
|
; The new FAT is held in FatSpace buffer.
|
|
;
|
|
; Registers Destroyed : SI,AX,BX,CX
|
|
;
|
|
; Assumes: DS:DATA,ES:Nothing
|
|
;
|
|
;=========================================================================
|
|
|
|
QuickFormat proc near
|
|
|
|
mov SI,DATA
|
|
mov ES,SI ; Set ES to data segment
|
|
|
|
assume ES:DATA,DS:Nothing ; Assembler directive
|
|
|
|
; Set device parameters here
|
|
mov ES:DeviceParameters.DP_SpecialFunctions,(INSTALL_FAKE_BPB or TRACKLAYOUT_IS_GOOD)
|
|
.errnz EDP_SPECIALFUNCTIONS NE DP_SPECIALFUNCTIONS
|
|
lea DX,ES:DeviceParameters
|
|
call SetDeviceParameters
|
|
|
|
.386
|
|
mov ES:sector_in_buffer,0ffffffffh ; force first read to ensure
|
|
; buffer validity
|
|
|
|
test ES:fBig32FAT,0ffh ; See if 32 bit fat
|
|
jz short Test16BitEntry ; If zero then 16 or 12 bit fat
|
|
mov EBX,00ffffff7h ; Set 32 bit value for bad cluster
|
|
jmp SHORT InitClusCount
|
|
|
|
Test16BitEntry:
|
|
test ES:fBigFAT,0ffh ; See if 16 bit fat
|
|
jz short Set12BitEntry ; If zero then 12 bit fat
|
|
mov EBX,0000fff7h ; Set 16 bit value for bad cluster
|
|
jmp SHORT InitClusCount
|
|
|
|
Set12BitEntry:
|
|
mov EBX,00000ff7h ; Set 12 bit value for bad cluster
|
|
|
|
InitClusCount:
|
|
mov ES:CurrentCluster,2 ; M015; No need to do the first 2
|
|
mov ES:BadClusValue,EBX
|
|
|
|
cmp es:FATNotAllInMem,0
|
|
je short QuickLoop
|
|
push ds
|
|
push es
|
|
pop ds
|
|
|
|
message msgSetBadClus
|
|
|
|
pop ds
|
|
QuickLoop:
|
|
mov EAX,ES:CurrentCluster
|
|
call calc_sector_and_offset ; determine location of this entry
|
|
|
|
mov EBX,ES:sector_in_buffer
|
|
mov EAX,ES:sector_to_read
|
|
cmp EAX,EBX ; check if required sector is in buffer
|
|
je short DontHaveToRead
|
|
cmp es:FATNotAllInMem,0
|
|
je short DoRead
|
|
push ds
|
|
push es
|
|
pop ds
|
|
|
|
call DisplayFatDonePcnt
|
|
|
|
pop ds
|
|
DoRead:
|
|
call ReadFatSector ; read a sector of the FAT into buffer
|
|
jc ExitQuickFormatCRLFErr ; check for error
|
|
|
|
DontHaveToRead:
|
|
mov EAX,ES:CurrentCluster ; EAX = current cluster
|
|
xor CX,CX ; ECX = get cluster contents signal
|
|
lds SI,ES:FatSector ; DS:SI --> FAT buffer
|
|
call GetFatSectorEntry ; EAX = contents of FAT entry
|
|
|
|
mov EBX,ES:BadClusValue ; Restore bad cluster value
|
|
cmp EAX,EBX ; Is this cluster marked bad?
|
|
jne short NextCluster ; If EAX<>EBX good cluster
|
|
MarkInFormatBuffer:
|
|
cmp es:FATNotAllInMem,0
|
|
je short DoBadInMem2
|
|
push es
|
|
pop ds
|
|
call AllocInitBadClusBitmap ; Does nothing if BadClusBitmap
|
|
; already exists
|
|
jc short ExitQuickFormatCRLFErr ; check for error
|
|
mov EAX,ES:CurrentCluster ; EAX = current cluster
|
|
lds si,es:BadClusBitMap
|
|
mov ebx,eax
|
|
shr ebx,19 ; (E)BX is "64k index" of this bit
|
|
and eax,00007FFFFh ; bit index in that 64k
|
|
mov cx,ds
|
|
add cx,bx ; Go to correct 64k piece
|
|
mov ds,cx
|
|
bts dword ptr [si],eax ; Set the bit
|
|
jmp short NextCluster
|
|
|
|
DoBadInMem2:
|
|
mov ECX,EBX ; ECX = value to set in FAT buffer
|
|
mov EAX,ES:CurrentCluster ; EAX = this cluster number
|
|
lds SI,ES:FatSpace ; DS:SI --> Format's FAT buffer
|
|
call GetSetFatEntry ; Set the cluster in Format's buffer
|
|
|
|
NextCluster:
|
|
inc ES:CurrentCluster ; go to next cluster
|
|
|
|
mov EAX,ES:CurrentCluster
|
|
mov EBX,ES:TotalClusters
|
|
cmp EAX,EBX ; check for last cluster in FAT
|
|
jna QuickLoop
|
|
.8086
|
|
mov BX,DATA
|
|
mov DS,BX ; restore DS to DATA segment
|
|
|
|
assume DS:DATA,ES:DATA ; Assembler directive
|
|
|
|
cmp ds:FATNotAllInMem,0
|
|
je ExitQuickFormatRet ; Carry clear if jmp
|
|
|
|
message msgSetBadClusDone
|
|
|
|
clc
|
|
ExitQuickFormatRet:
|
|
ret
|
|
|
|
ExitQuickFormatCRLFErr:
|
|
mov BX,DATA
|
|
mov DS,BX
|
|
cmp ds:FATNotAllInMem,0
|
|
stc
|
|
je ExitQuickFormatRet
|
|
|
|
Message msgCrLf
|
|
|
|
stc
|
|
jmp short ExitQuickFormatRet
|
|
|
|
QuickFormat endp
|
|
|
|
;===========================================================================
|
|
;
|
|
; calc_sector_and_offset : This procedure computes the logical sector
|
|
; number the given FAT entry is in, and its
|
|
; offset from the start of the sector.
|
|
;
|
|
; Inputs : EAX = entry number
|
|
; fBigFat = flag for 12- or 16-bit FAT entries
|
|
; Number of reserved sectors
|
|
;
|
|
; Output : sector_to_read = logical disk sector holding FAT entry
|
|
; entry_offset = offset from start of sector
|
|
; odd_entry = flag for 12-bit entry alignment (1=odd,0=even)
|
|
;
|
|
; Registers Destroyed : AX,BX,CX,DX
|
|
;
|
|
; Strategy : This procedure assumes the sector size is 512 bytes.
|
|
; The byte offset from the start of the FAT is first
|
|
; calculated. This is then divided by 512, so that
|
|
; required sector = quotient
|
|
; offset = remainder
|
|
; The logical sector number is obtained by adding on the
|
|
; number of reserved sectors.
|
|
;
|
|
; M017: The code does not assume 512 BytesPerSector (it is even simpler!)
|
|
;============================================================================
|
|
|
|
calc_sector_and_offset proc near
|
|
|
|
assume DS:NOTHING,ES:DATA
|
|
.386
|
|
xor EDX,EDX
|
|
test ES:fBig32Fat,0ffh ; See if 32 bit FAT
|
|
jz short TestOffset16 ; If not do 16 or 12 bit FAT
|
|
shl EAX,1 ; EAX *= 2
|
|
rcl EDX,1
|
|
jmp short FindOffset16 ; Now mult by 2 again for * 4
|
|
|
|
TestOffset16:
|
|
test ES:fBigFat,0ffh ; See if 16 bit FAT
|
|
jz short FindOffset12 ; If not do 12 bit FAT
|
|
FindOffset16:
|
|
shl EAX,1 ; EAX *= 2
|
|
rcl EDX,1
|
|
; Now offset from start of FAT is
|
|
; in EDX:EAX
|
|
jmp SHORT FindSector
|
|
|
|
FindOffset12:
|
|
mov BX,AX ; BX = cluster number
|
|
shl AX,1
|
|
add AX,BX ; AX *= 3
|
|
|
|
mov ES:odd_entry,AL ; lsb of AX determines even or odd
|
|
and ES:odd_entry,1
|
|
|
|
shr AX,1 ; Divide by 2
|
|
; Now offset from start of FAT is
|
|
; in EDX:EAX
|
|
|
|
FindSector:
|
|
movzx ebx,ES:DeviceParameters.DP_BPB.oldBPB.BPB_BytesPerSector
|
|
.errnz EDP_BPB NE DP_BPB
|
|
div ebx
|
|
mov ES:entry_offset,DX
|
|
movzx ebx,ES:DeviceParameters.DP_BPB.oldBPB.BPB_RESERVEDSECTORS
|
|
add EAX,ebx
|
|
mov ES:sector_to_read,EAX
|
|
.8086
|
|
ret
|
|
|
|
calc_sector_and_offset endp
|
|
|
|
;===========================================================================
|
|
;
|
|
; ReadFatSector : This procedure will read in a sector of the FAT
|
|
; into the FatSector buffer. This is done by loading
|
|
; the required parameters and calling ReadWriteSectors.
|
|
;
|
|
; Input : sector_to_read
|
|
; Output: loaded buffer
|
|
; sector_in_buffer
|
|
;
|
|
; Registers destroyed: AX,BX,CX,DX
|
|
;
|
|
;===========================================================================
|
|
|
|
ReadFatSector proc near
|
|
|
|
assume DS:NOTHING,ES:DATA
|
|
|
|
push DS ; Preserve DS
|
|
|
|
.386
|
|
mov EDX,ES:sector_to_read ; EDX = starting sector
|
|
;; Manual assemble to prevent compile warning
|
|
;; push edx
|
|
db 066h,052h
|
|
;;
|
|
cmp ES:DeviceParameters.DP_BPB.oldBPB.BPB_SectorsPerFAT,0
|
|
.errnz EDP_BPB NE DP_BPB
|
|
je short NotBigFAT1
|
|
mov cx,ES:DeviceParameters.DP_BPB.BGBPB_ExtFlags
|
|
test cx,BGBPB_F_NoFATMirror
|
|
jz short NotBigFAT1
|
|
and ecx,NOT BGBPB_F_ActiveFATMsk
|
|
jz short NotBigFAT1
|
|
mov ebx,edx
|
|
mov eax,dword ptr ES:DeviceParameters.DP_BPB.BGBPB_BigSectorsPerFat
|
|
mul ecx
|
|
add eax,ebx
|
|
mov edx,eax
|
|
NotBigFAT1:
|
|
mov ebx,edx
|
|
shr ebx,16
|
|
mov ES:Read_Write_Relative.Start_Sector_High,bx
|
|
mov AL,ES:DriveToFormat ; AL = DOS drive number
|
|
mov CX,1 ; 1 sector only
|
|
lds BX,ES:FatSector ; DS:BX --> read buffer
|
|
|
|
call Read_Disk ; perform read
|
|
|
|
;; Manual assemble to prevent compile warning
|
|
;; pop edx
|
|
db 066h,05Ah
|
|
;;
|
|
mov ES:sector_in_buffer,EDX ; update sector in memory
|
|
.8086
|
|
pop DS ; Restore DS
|
|
|
|
ret
|
|
|
|
ReadFatSector endp
|
|
|
|
;=========================================================================
|
|
; WriteFatSector : This routine writes the logical sector count requested.
|
|
; of the FAT
|
|
;
|
|
; Inputs : AL - Drive letter
|
|
; DS:BX - Segment:offset of transfer address
|
|
; ECX - Sector count
|
|
; EDX - 1st. sector
|
|
; ES -> Data
|
|
;
|
|
; Outputs : Logical Sectors written
|
|
;=========================================================================
|
|
|
|
procedure WriteFatSector
|
|
assume DS:NOTHING,ES:DATA
|
|
.386
|
|
$$DO67:
|
|
or ECX,ECX ; any Sectors?
|
|
jz short $$EN67 ; no
|
|
ifdef NEC_98
|
|
cmp ECX,10h ; Single write?
|
|
jna short $$IF69 ; yes
|
|
|
|
;; Manual assemble to prevent compilke warning
|
|
;; push ECX ; save count left
|
|
db 066h,051h
|
|
;;
|
|
mov CX,10h
|
|
push AX ; save AX
|
|
mov eax,edx
|
|
shr eax,16
|
|
mov Read_Write_Relative.Start_Sector_High,ax
|
|
pop ax ; Recover drive
|
|
push ax
|
|
;; Manual assemble to prevent compile warning
|
|
;; push EDX
|
|
db 066h,052h
|
|
;;
|
|
call write_disk ; write it
|
|
;; Manual assemble to prevent compile warning
|
|
;; pop EDX
|
|
db 066h,05Ah
|
|
;;
|
|
pop AX ; restore AX
|
|
;; Manual assemble to prevent compile warning
|
|
;; pop ECX ; restore count
|
|
db 066h,059h
|
|
;;
|
|
jc short Write_Exit ; exit if fail
|
|
mov SI,ES:DeviceParameters.DP_BPB.oldBPB.BPB_BytesPerSector
|
|
shl SI,1
|
|
shl SI,1
|
|
shl SI,1
|
|
shl SI,1 ; * 10h
|
|
call seg_adj ; adjust segment
|
|
mov BX,SI ; new offset
|
|
add EDX,10h
|
|
sub ECX,10h
|
|
jmp SHORT $$DO67
|
|
else
|
|
cmp ECX,40h ; Single write?
|
|
jna short $$IF69 ; yes
|
|
|
|
;; Manual assemble to prevent compilke warning
|
|
;; push ECX ; save count left
|
|
db 066h,051h
|
|
;;
|
|
mov CX,40h
|
|
push AX ; save AX
|
|
mov eax,edx
|
|
shr eax,16
|
|
mov Read_Write_Relative.Start_Sector_High,ax
|
|
pop ax ; Recover drive
|
|
push ax
|
|
;; Manual assemble to prevent compile warning
|
|
;; push EDX
|
|
db 066h,052h
|
|
;;
|
|
call write_disk ; write it
|
|
;; Manual assemble to prevent compile warning
|
|
;; pop EDX
|
|
db 066h,05Ah
|
|
;;
|
|
pop AX ; restore AX
|
|
;; Manual assemble to prevent compile warning
|
|
;; pop ECX ; restore count
|
|
db 066h,059h
|
|
;;
|
|
jc short Write_Exit ; exit if fail
|
|
mov SI,8000h
|
|
call seg_adj ; adjust segment
|
|
mov BX,SI ; new offset
|
|
add EDX,40h
|
|
sub ECX,40h
|
|
jmp SHORT $$DO67
|
|
endif
|
|
|
|
$$IF69:
|
|
push AX ; save drive
|
|
mov eax,edx
|
|
shr eax,16
|
|
mov Read_Write_Relative.Start_Sector_High,ax
|
|
pop ax ; Recover drive
|
|
push ax
|
|
call write_disk ; write it
|
|
pop AX ; restore AX
|
|
mov ECX,0 ; set CX to 0 - last read
|
|
.8086 ; DO NOT XOR!!!
|
|
$$EN67:
|
|
Write_Exit:
|
|
ret
|
|
|
|
WriteFatSector ENDP
|
|
|
|
FlushCurrInMemFATBuf proc near
|
|
ASSUME DS:DATA,ES:NOTHING
|
|
|
|
push ds
|
|
push ds
|
|
pop es
|
|
.386
|
|
assume ES:DATA
|
|
movzx cx,DeviceParameters.DP_BPB.oldBPB.BPB_NumberOfFats ;loop control
|
|
.errnz EDP_BPB NE DP_BPB
|
|
or CX,CX ;check for zero
|
|
stc
|
|
jz short FFMExit
|
|
|
|
movzx eax,DeviceParameters.DP_BPB.oldBPB.BPB_SectorsPerFat
|
|
or ax,ax
|
|
jnz short GtFatSz
|
|
mov eax,dword ptr DeviceParameters.DP_BPB.BGBPB_BigSectorsPerFat
|
|
GtFatSz:
|
|
mov edx,CurrFATInMemStartSec
|
|
lds BX,FatSpace ;DS:BX --> FatSpace
|
|
assume DS:NOTHING,ES:DATA
|
|
mov SI,BX ;Set up for add. calc
|
|
call SEG_ADJ ;Get adjusted seg:off
|
|
mov BX,SI ;Get new offset
|
|
|
|
WriteFatLp: ;loop while FATs > 0
|
|
;; Manual assemble to prevent compile warning
|
|
;; push eax ;Save FAT size
|
|
db 066h,050h
|
|
;;
|
|
push BX ;save Fat offset
|
|
push DS ;save Fat segment
|
|
push CX ;save Fat count
|
|
;; Manual assemble to prevent compile warning
|
|
;; push EDX ;Fat start sector
|
|
db 066h,052h
|
|
;;
|
|
mov ecx,CurrFATInMemSecCnt
|
|
mov AL,DriveToFormat
|
|
call WriteFatSector ;write the Fat
|
|
;; Manual assemble to prevent compile warning
|
|
;; pop EDX ;get 1st. Fat sector
|
|
db 066h,05Ah
|
|
;;
|
|
pop CX ;get Fat count
|
|
pop DS ;restore Fat segment
|
|
pop BX ;restore Fat offset
|
|
;; Manual assemble to prevent compile warning
|
|
;; pop eax ;restore FAT size
|
|
db 066h,058h
|
|
;;
|
|
jc short FFMExit ;check for errors
|
|
add EDX,EAX ;next FAT start sector
|
|
loop WriteFatLp ;write all FATs
|
|
clc
|
|
FFMExit:
|
|
pop ds
|
|
ret
|
|
|
|
FlushCurrInMemFATBuf endp
|
|
|
|
DisplayFatDonePcnt proc near
|
|
assume DS:DATA,ES:NOTHING
|
|
|
|
.386
|
|
mov eax,CurrentCluster
|
|
dec eax
|
|
dec eax
|
|
mov ecx,100
|
|
mul ecx
|
|
mov ecx,TotalClusters
|
|
dec ecx
|
|
dec ecx
|
|
div ecx
|
|
.8086
|
|
cmp ax,100
|
|
jbe PcntOk
|
|
mov ax,100
|
|
PcntOk:
|
|
cmp AX,PercentComplete ;Only print message when change
|
|
je NoUpd
|
|
mov PercentComplete,AX ; Save it if changed
|
|
Message msgCurrentTrack
|
|
NoUpd:
|
|
ret
|
|
|
|
DisplayFatDonePcnt endp
|
|
|
|
|
|
;===========================================================================
|
|
; Routine name: FlushFATBuf
|
|
;===========================================================================
|
|
;
|
|
; Description: Flush the in memory FAT buffer out to the disk
|
|
;
|
|
; Arguments: None
|
|
; ----------------------------------------------------------------
|
|
; Returns: carry set if error
|
|
; -----------------------------------------------------
|
|
; Registers destroyed: EAX EBX ECX EDX
|
|
; ----------------------------------------
|
|
; Strategy
|
|
; --------
|
|
;===========================================================================
|
|
|
|
FlushFATBuf PROC near
|
|
assume DS:DATA,ES:NOTHING
|
|
|
|
push DS ;preserve DS
|
|
cmp FATNotAllInMem,0
|
|
.386
|
|
je WrtWholeFat
|
|
;
|
|
; What we have at this point is the first part of the FAT in the in
|
|
; memory FAT buf and the BadClusBitMap which indicates what clusters
|
|
; we want to mark bad.
|
|
;
|
|
; Go through the in memory FAT buf (currently first FATSecCntInMem
|
|
; sectors of the FAT) marking any bad clusters, and/or write an EOF
|
|
; mark in the root directory start cluster, write it out.
|
|
;
|
|
; For rest of FAT, zero init in memory FAT buf, mark bad clusters
|
|
; and/or put EOF mark in root directory start cluster and write it out.
|
|
;
|
|
; We had better be talking 32-bit FAT here!!!!!! 12-bit and 16-bit
|
|
; FATs always fit in memory.
|
|
;
|
|
test fBig32FAT,0ffh
|
|
stc ; Set error
|
|
jz ExitWriteFat ; Not 32-bit FAT !!!?????
|
|
|
|
; Set the bad clus value
|
|
mov BadClusValue,00ffffff7h ; Set 32 bit value for bad cluster
|
|
|
|
; Set the current in mem FAT start sector
|
|
movzx eax,DeviceParameters.DP_BPB.oldBPB.BPB_ReservedSectors
|
|
.errnz EDP_BPB NE DP_BPB
|
|
mov CurrFATInMemStartSec,eax
|
|
|
|
; Calculate how many clusters fit in memory NOTE that since we are
|
|
; restricted to 32-bit FAT here we KNOW clusters do not span sector
|
|
; boundaries in the FAT.
|
|
mov eax,FATSecCntInMem
|
|
mov CurrFATInMemSecCnt,eax
|
|
movzx ecx,DeviceParameters.DP_BPB.oldBPB.BPB_BytesPerSector
|
|
mul ecx
|
|
mov ecx,4 ; 4 bytes per cluster
|
|
div ecx
|
|
mov FATInMemClusCnt,eax
|
|
|
|
; Init the in memory buffer with the start of the fat
|
|
|
|
call init_fat_with_header
|
|
|
|
message msgWriteFat
|
|
|
|
; Set the rest of the buffer control variables for the in memory buffer
|
|
mov CurrentCluster,2
|
|
mov CurrFATInMemStartClus,0
|
|
ClusLoop2:
|
|
call DisplayFatDonePcnt
|
|
mov eax,dword ptr DeviceParameters.DP_BPB.BGBPB_RootDirStrtClus
|
|
cmp eax,2
|
|
jb short NoRootEOF
|
|
cmp EAX,TotalClusters
|
|
ja short NoRootEOF
|
|
sub eax,CurrFATInMemStartClus
|
|
jc short NoRootEOF
|
|
cmp eax,FATInMemClusCnt
|
|
jae short NoRootEOF
|
|
shl eax,2 ; * 4 bytes per cluster
|
|
mov ecx,00FFFFFFFh
|
|
push ds
|
|
lds BX,FatSpace ;DS:BX --> FatSpace
|
|
assume DS:nothing
|
|
ror eax,16 ; AX is high 16 bits of EAX
|
|
; which is "64k index" of
|
|
; this DWORD
|
|
shl ax,12 ; Convert to SEGMENT value
|
|
push cx ; Save low 16 of bad mark
|
|
mov cx,ds
|
|
add cx,ax
|
|
mov ds,cx
|
|
pop cx
|
|
ror eax,16 ; Get back offset in this 64k
|
|
add bx,ax ; Index this cluster entry
|
|
mov dword ptr ds:[bx],ecx ; Mark as BAD
|
|
pop ds
|
|
assume DS:data
|
|
NoRootEOF:
|
|
cmp BadClusBitMap,0 ; Anything to mark?
|
|
je short NoBadToMark ; Nope
|
|
mov eax,CurrentCluster
|
|
push ds
|
|
lds si,BadClusBitMap
|
|
assume DS:nothing
|
|
mov ebx,eax
|
|
shr ebx,19 ; (E)BX is "64k index" of this bit
|
|
and eax,00007FFFFh ; bit index in that 64k
|
|
mov cx,ds
|
|
add cx,bx ; Go to correct 64k piece
|
|
mov ds,cx
|
|
bt dword ptr [si],eax ; Bad cluster?
|
|
pop ds
|
|
assume DS:data
|
|
jnc short NxtClus ; No
|
|
mov eax,CurrentCluster
|
|
sub eax,CurrFATInMemStartClus
|
|
shl eax,2 ; * 4 bytes per cluster
|
|
mov ecx,BadClusValue
|
|
push ds
|
|
lds BX,FatSpace ;DS:BX --> FatSpace
|
|
assume DS:nothing
|
|
ror eax,16 ; AX is high 16 bits of EAX
|
|
; which is "64k index" of
|
|
; this DWORD
|
|
shl ax,12 ; Convert to SEGMENT value
|
|
push cx ; Save low 16 of bad mark
|
|
mov cx,ds
|
|
add cx,ax
|
|
mov ds,cx
|
|
pop cx
|
|
ror eax,16 ; Get back offset in this 64k
|
|
add bx,ax ; Index this cluster entry
|
|
mov dword ptr ds:[bx],ecx ; Mark as BAD
|
|
pop ds
|
|
assume DS:data
|
|
NxtClus:
|
|
inc CurrentCluster
|
|
mov eax,CurrentCluster
|
|
sub eax,CurrFATInMemStartClus
|
|
cmp eax,FATInMemClusCnt
|
|
jae short NextBuf
|
|
jmp short TestDone
|
|
|
|
NoBadToMark:
|
|
mov eax,FATInMemClusCnt
|
|
cmp CurrentCluster,2 ; Special case?
|
|
ja short OkayAdd ; No
|
|
sub eax,2 ; Special case for first FAT buffer
|
|
OkayAdd:
|
|
add CurrentCluster,eax
|
|
NextBuf:
|
|
call FlushCurrInMemFATBuf
|
|
jc short ExitWriteFatCRLFErr
|
|
call Fat_Init ; Zero init the in mem buffer
|
|
mov eax,CurrFATInMemSecCnt
|
|
add eax,CurrFATInMemStartSec
|
|
movzx ECX,DeviceParameters.DP_BPB.oldBPB.BPB_ReservedSectors
|
|
movzx edx,DeviceParameters.DP_BPB.oldBPB.BPB_SectorsPerFat
|
|
or dx,dx
|
|
jnz short GtFatSz2
|
|
mov edx,dword ptr DeviceParameters.DP_BPB.BGBPB_BigSectorsPerFat
|
|
GtFatSz2:
|
|
add ecx,edx ; First sector after the FAT
|
|
cmp eax,ecx ; Start sector in the FAT area?
|
|
jae short DoMsgDone ; No, all done, carry clear if jump
|
|
mov CurrFATInMemStartSec,eax
|
|
sub ecx,eax ; ecx is count of sectors left in FAT
|
|
cmp ecx,CurrFATInMemSecCnt ; Partial buffer at end of FAT?
|
|
jae short CntOK ; No.
|
|
mov CurrFATInMemSecCnt,ecx ; Last part of FAT < buffer size
|
|
CntOK:
|
|
mov eax,CurrentCluster
|
|
mov CurrFATInMemStartClus,eax
|
|
TestDone:
|
|
mov EAX,CurrentCluster
|
|
cmp EAX,TotalClusters ; check for last cluster in FAT
|
|
jna ClusLoop2
|
|
.8086
|
|
call FlushCurrInMemFATBuf ; Sets carry for return
|
|
jc ExitWriteFatCRLFErr
|
|
DoMsgDone:
|
|
|
|
message msgSetBadClusDone
|
|
|
|
clc
|
|
jmp short ExitWriteFat
|
|
|
|
ExitWriteFatCRLFErr:
|
|
Message msgCrLf
|
|
|
|
stc
|
|
jmp short ExitWriteFat
|
|
|
|
WrtWholeFat:
|
|
.386
|
|
push ds
|
|
pop es
|
|
assume ES:DATA
|
|
movzx cx,DeviceParameters.DP_BPB.oldBPB.BPB_NumberOfFats ;loop control
|
|
or CX,CX ;check for zero
|
|
jz short ExitWriteFat
|
|
movzx eax,ES:DeviceParameters.DP_BPB.oldBPB.BPB_SectorsPerFat
|
|
or ax,ax
|
|
jnz short GotFatSz
|
|
mov eax,dword ptr ES:DeviceParameters.DP_BPB.BGBPB_BigSectorsPerFat
|
|
GotFatSz:
|
|
movzx EDX,DeviceParameters.DP_BPB.oldBPB.BPB_ReservedSectors ;starting sector
|
|
lds BX,FatSpace ;DS:BX --> FatSpace
|
|
assume DS:NOTHING,ES:DATA
|
|
mov SI,BX ;Set up for add. calc
|
|
call SEG_ADJ ;Get adjusted seg:off
|
|
mov BX,SI ;Get new offset
|
|
|
|
WriteFatLoop: ;loop while FATs > 0
|
|
;; Manual assemble to prevent compile warning
|
|
;; push eax ;Save FAT size
|
|
db 066h,050h
|
|
;;
|
|
push BX ;save Fat offset
|
|
push DS ;save Fat segment
|
|
push CX ;save Fat count
|
|
;; Manual assemble to prevent compile warning
|
|
;; push EDX ;Fat start sector
|
|
db 066h,052h
|
|
;;
|
|
mov ecx,eax
|
|
mov AL,DriveToFormat
|
|
call WriteFatSector ;write the Fat
|
|
;; Manual assemble to prevent compile warning
|
|
;; pop EDX ;get 1st. Fat sector
|
|
db 066h,05Ah
|
|
;;
|
|
pop CX ;get Fat count
|
|
pop DS ;restore Fat segment
|
|
pop BX ;restore Fat offset
|
|
;; Manual assemble to prevent compile warning
|
|
;; pop eax ;restore FAT size
|
|
db 066h,058h
|
|
;;
|
|
jc short ExitWriteFat ;check for errors
|
|
add EDX,EAX ;next FAT start sector
|
|
loop WriteFatLoop ;write all FATs
|
|
ExitWriteFatOK:
|
|
clc ;signal success
|
|
ExitWriteFat:
|
|
pop DS ;restore DS
|
|
assume DS:DATA
|
|
ret
|
|
|
|
FlushFATBuf endp
|
|
|
|
|
|
;===========================================================================
|
|
; Routine name: GetSetFatEntry
|
|
;===========================================================================
|
|
;
|
|
; Description: Returns or sets the contents of the specified fat
|
|
; entry from a specified buffer. The buffer may be
|
|
; up to 128K in length for 16 bit FATs and 16K for
|
|
; 12 bit FATs.
|
|
;
|
|
; WARNING: Do not call this if FATNotAllInMem is TRUE
|
|
;
|
|
; Arguments: DS:SI --> Start of FAT buffer
|
|
; EAX = Cluster number
|
|
; ECX = 0fffffffeh if get cluster else set cluster from ECX
|
|
; ----------------------------------------------------------------
|
|
; Returns: EAX --> Contents of FAT entry
|
|
; -----------------------------------------------------
|
|
; Registers destroyed: EAX EBX ECX EDX
|
|
; ----------------------------------------
|
|
; Strategy
|
|
; --------
|
|
;===========================================================================
|
|
|
|
GetSetFatEntry PROC near
|
|
|
|
assume DS:NOTHING,ES:DATA
|
|
|
|
push SI ; Save regs for 'C' compatibility
|
|
push DS
|
|
push ES
|
|
|
|
; mov BX,DATA ; ES = DATA
|
|
; mov ES,BX
|
|
|
|
call Seg_Adj ; Normalize the pointer
|
|
.386
|
|
xor edx,edx
|
|
test ES:fBig32Fat,0ffh ; See if 32 bit FAT
|
|
jz short TestEntry16 ; If not do 12 bit FAT
|
|
shl EAX,1 ; EDX:EAX *= 2
|
|
rcl edx,1
|
|
jmp short FindEntry16 ; and *2 again for total of *4
|
|
|
|
TestEntry16:
|
|
test ES:fBigFat,0ffh ; See if 16 bit FAT
|
|
jz short FindEntry12 ; If not do 12 bit FAT
|
|
|
|
FindEntry16:
|
|
shl EAX,1 ; EDX:EAX *= 2
|
|
rcl edx,1
|
|
|
|
AddToBufStart: ; Offset in EAX may be > 64K
|
|
mov EBX,16 ; Convert EDX:EAX to paragraphs
|
|
div EBX ; (AX = DX:AX / 16) (DX = DX:AX % 16)
|
|
|
|
mov BX,DS ; Add paragraphs to DS
|
|
add AX,BX
|
|
mov DS,AX
|
|
|
|
add SI,DX ; Add remaining offset in DX to SI
|
|
|
|
|
|
cmp ecx,0fffffffeh ; if ECX == 0fffffffeh, then get entry
|
|
jz short GetFatEntry16
|
|
test ES:fBig32Fat,0ffh ; See if 32 bit FAT
|
|
jz short DoEntry16a
|
|
mov dword ptr [SI],ECX ; Set the entry
|
|
jmp SHORT GetSetEntryExit
|
|
|
|
DoEntry16a:
|
|
mov word ptr [SI],CX ; Set the entry
|
|
jmp SHORT GetSetEntryExitzx ; AX = FAT entry
|
|
|
|
GetFatEntry16:
|
|
test ES:fBig32Fat,0ffh ; See if 32 bit FAT
|
|
jz short DoEntry16
|
|
mov EAX,dword ptr [SI] ; Move the entry into EAX
|
|
and EAX,00FFFFFFFh ; Discard high 4 bits
|
|
jmp SHORT GetSetEntryExit ; EAX = FAT entry
|
|
.8086
|
|
|
|
DoEntry16:
|
|
mov AX,word ptr [SI] ; Move the entry into AX
|
|
jmp SHORT GetSetEntryExitzx ; AX = FAT entry
|
|
|
|
FindEntry12:
|
|
mov BX,AX ; BX = cluster number
|
|
shl AX,1
|
|
add AX,BX ; AX *= 3
|
|
|
|
test AX,1 ; Test lsb of AX to see if even or odd
|
|
pushf ; Save zero flag
|
|
|
|
shr AX,1 ; Divid by 2
|
|
add SI,AX ; Address the cluster
|
|
mov AX,[SI] ; AX = entry + part of another entry
|
|
popf ; Get bit test off the stack
|
|
jnz OddCluster ; If not zero then it's an odd cluster
|
|
|
|
EvenCluster:
|
|
cmp cx,0fffeh
|
|
jz GetEvenCluster ; Check for get or set
|
|
and AX,0f000h ; Zero out the value in 12 lsb
|
|
or AX,CX ; Set the new value
|
|
mov [SI],AX
|
|
jmp SHORT GetSetEntryExitzx ; AX = FAT entry
|
|
|
|
GetEvenCluster:
|
|
and AX,0fffh ; Mask off high 4 bits
|
|
jmp SHORT GetSetEntryExitzx ; AX = FAT entry
|
|
|
|
OddCluster:
|
|
cmp cx,0fffeh
|
|
jz GetOddCluster ; Check for get or set
|
|
|
|
.386
|
|
shl CX,4 ; Set the value Shift left 4 bits
|
|
.8086
|
|
and AX,0fh ; Zero out existing value in 12 msb
|
|
or AX,CX ; Insert new value
|
|
mov [SI],AX
|
|
jmp SHORT GetSetEntryExitzx ; AX = FAT entry
|
|
|
|
GetOddCluster:
|
|
.386
|
|
shr AX,4 ; Shift over 4 bits to get entry
|
|
GetSetEntryExitzx:
|
|
movzx eax,ax
|
|
.8086
|
|
GetSetEntryExit:
|
|
pop ES ; Restore regs for 'C' compatibility
|
|
pop DS
|
|
pop SI
|
|
ret
|
|
|
|
GetSetFatEntry ENDP
|
|
|
|
;===========================================================================
|
|
; Routine name: GetFatSectorEntry
|
|
;===========================================================================
|
|
;
|
|
; Description: Returns the contents of the specified fat
|
|
; entry from the FatSector buffer. It is assumed that the
|
|
; required sector is in the buffer already. If the entry is
|
|
; 12 bits and overlaps sectors, the next sector will be read
|
|
; into the FatSector buffer.
|
|
;
|
|
; Arguments: DS:SI --> Start of FatSector buffer
|
|
; entry_offset = offset of entry from start of buffer
|
|
; fBigFat fBig32Fat = flags for 12-16-32-bit FAT
|
|
; -------------------------------------------------------------------------
|
|
; Returns: EAX --> Contents of FAT entry
|
|
; -----------------------------------------------------
|
|
; Registers destroyed: EAX BX CX DX
|
|
; ---------------------------------
|
|
;
|
|
;===========================================================================
|
|
|
|
GetFatSectorEntry PROC near
|
|
|
|
assume DS:NOTHING,ES:DATA
|
|
|
|
push SI ; Save regs for 'C' compatibility
|
|
push DS
|
|
push ES
|
|
|
|
; mov BX,DATA ; ES = DATA
|
|
; mov ES,BX
|
|
|
|
call Seg_Adj ; Normalize the pointer
|
|
|
|
mov DX,ES:entry_offset
|
|
add SI,DX ; Add offset value in DX to SI
|
|
|
|
test ES:fBig32Fat,0ffh ; See if 32 bit FAT
|
|
jz short TestEntry16x ; If not do 12-16 bit FAT
|
|
.386
|
|
mov EAX,dword ptr [SI] ; Move the entry into AX
|
|
and EAX,00FFFFFFFh ; Discard high 4 bits
|
|
.8086
|
|
jmp SHORT GetFatSectorEntryExit ; EAX = FAT entry
|
|
|
|
TestEntry16x:
|
|
test ES:fBigFat,0ffh ; See if 16 bit FAT
|
|
jz Get12 ; If not do 12 bit FAT
|
|
|
|
Get16:
|
|
.386
|
|
movzx EAX,word ptr [SI] ; Move the entry into AX
|
|
.8086
|
|
jmp SHORT GetFatSectorEntryExit ; EAX = FAT entry
|
|
|
|
Get12:
|
|
ifdef NEC_98
|
|
;;; mov AX,DeviceParameters.DP_BPB.BPB_BytesPerSector
|
|
; Fix for B#7418
|
|
mov AX,ES:DeviceParameters.DP_BPB.oldBPB.BPB_BytesPerSector
|
|
dec AX
|
|
cmp DX,AX
|
|
else
|
|
cmp DX,1ffh ; Entry straddles two FAT sectors if
|
|
endif
|
|
jb Does_Not_Straddle ; offset is 511 (last byte in sector)
|
|
Does_Straddle:
|
|
call ReadInTwoParts ; Handle special case by reading in
|
|
jmp SHORT GetFatSectorEntryExit ; the next FAT sector also
|
|
|
|
Does_Not_Straddle:
|
|
.386
|
|
movzx EAX,word ptr [SI] ; EAX = entry + part of another entry
|
|
.8086
|
|
test ES:odd_entry,1
|
|
jnz IsOddCluster ; If not zero then it's an odd cluster
|
|
|
|
IsEvenCluster:
|
|
and AX,0fffh ; Mask off high 4 bits
|
|
jmp SHORT GetFatSectorEntryExit ; EAX = FAT entry
|
|
|
|
IsOddCluster:
|
|
.386
|
|
shr AX,4 ; Shift over 4 bits to get entry
|
|
.8086
|
|
GetFatSectorEntryExit:
|
|
pop ES ; Restore regs for 'C' compatibility
|
|
pop DS
|
|
pop SI
|
|
ret
|
|
|
|
GetFatSectorEntry ENDP
|
|
|
|
;===========================================================================
|
|
;
|
|
; ReadInTwoParts : This procedure will determine the value of a 12-bit
|
|
; FAT entry which is straddled across two consecutive
|
|
; sectors in the FAT. The value is found by reading
|
|
; the available part from the first sector, and then
|
|
; loading the next sector in the FatSector buffer and
|
|
; reading and combining the next part.
|
|
; Input : odd_entry
|
|
; sector_to_read
|
|
; DS:SI pointer to required entry location in buffer (this is
|
|
; offset 511 from start of FatSector buffer)
|
|
;
|
|
; Output: AX = entry value
|
|
; FatSector contains next FAT sector
|
|
;
|
|
; Registers destroyed : AX
|
|
;
|
|
; Strategy : The position of the entry is different for odd and even
|
|
; entries. The 3-byte layout for two consecutive 12-bit entries
|
|
; is shown below. (The byte |X1 X0| or |Y2 X2| is the last
|
|
; in the buffer).
|
|
;
|
|
; |X1 X0|Y0 X2|Y2 Y1|
|
|
;
|
|
; Even entries start at X1 (thus need to get X2X1X0).
|
|
; Odd entries start at Y0 (thus need to get Y2Y1Y0).
|
|
;
|
|
;===========================================================================
|
|
|
|
ReadInTwoParts proc near
|
|
|
|
assume DS:NOTHING,ES:DATA
|
|
|
|
push BX ; Save registers
|
|
push CX
|
|
push DX
|
|
push SI
|
|
|
|
xor AX,AX
|
|
mov AL,BYTE PTR [SI] ; read last byte of buffer
|
|
.386
|
|
mov EBX,ES:sector_to_read ; compute next sector to read
|
|
inc EBX
|
|
mov ES:sector_to_read,EBX
|
|
.8086
|
|
test ES:odd_entry,1
|
|
jnz OddEntry
|
|
|
|
EvenEntry:
|
|
push AX
|
|
call ReadFatSector ; read in the next FAT sector
|
|
pop AX
|
|
|
|
lds SI,ES:FatSector ; set DS:SI to start of buffer
|
|
xor BX,BX
|
|
|
|
mov BH,BYTE PTR [SI] ; read first byte of buffer
|
|
and BH,0fh ; mask out Y2
|
|
or AX,BX ; place X2 into position
|
|
|
|
jmp SHORT EndReadInTwo
|
|
|
|
OddEntry:
|
|
and AL,0f0h ; mask out X2
|
|
mov CL,4
|
|
shr AX,CL ; place Y0 into position
|
|
|
|
push AX
|
|
call ReadFatSector ; read in the next FAT sector
|
|
pop AX
|
|
|
|
lds SI,ES:FatSector ; set DS:SI to start of buffer
|
|
|
|
xor BX,BX
|
|
mov BL,BYTE PTR [SI] ; read first byte of buffer
|
|
mov CL,4
|
|
shl BX,CL
|
|
or AX,BX ; place Y2 Y1 into position
|
|
|
|
EndReadInTwo:
|
|
pop SI ; Restore registers
|
|
pop DX
|
|
pop CX
|
|
pop BX
|
|
ret
|
|
|
|
ReadInTwoParts endp
|
|
|
|
AllocInitBadClusBitmap proc near
|
|
|
|
assume DS:DATA,ES:NOTHING
|
|
push es
|
|
.386
|
|
cmp BadClusBitMap,0
|
|
jne short DoneOk
|
|
mov ebx, TotalClusters
|
|
add ebx,32 ; 32 not 31
|
|
shr ebx,5 ; Cnt of DWORDs
|
|
shl ebx,2 ; Cnt of BYTEs
|
|
add ebx,15
|
|
shr ebx,4 ; Cnt of paras
|
|
|
|
%out BUG limit on bad cluster bitmap
|
|
|
|
cmp ebx,00005000h ; Bitmap > 320k? (2,621,440 clusters)
|
|
ja short ErrExit_Alloc_BCB ; Yes
|
|
mov AH, Alloc
|
|
int 21h
|
|
jc short Exit_Alloc_BCB
|
|
mov WORD PTR BadClusBitMap+2,AX
|
|
mov es,ax
|
|
xor di,di
|
|
xor AX,AX
|
|
mov WORD PTR BadClusBitMap,AX
|
|
movzx ecx,bx ; Cnt of paras
|
|
shl ecx,3 ; 8 words per para
|
|
mov edx,ecx
|
|
NxtBlock:
|
|
cmp ecx,8000h ; More than 64k left?
|
|
jbe short ZotIt ; Nope, last one
|
|
mov ecx,00008000h ; Do at most 64k at a time
|
|
ZotIt:
|
|
mov ebx,ecx ; Save count
|
|
cld
|
|
rep stosw ; zero init bit array
|
|
sub edx,ebx ; Sub off amount done
|
|
jbe short DoneOk ; All done
|
|
mov ax,es
|
|
add ax,1000h ; Next 64k
|
|
mov es,ax
|
|
xor di,di
|
|
mov ecx,edx
|
|
jmp short NxtBlock
|
|
.8086
|
|
DoneOk:
|
|
clc
|
|
Exit_Alloc_BCB:
|
|
pop es
|
|
ret
|
|
|
|
ErrExit_Alloc_BCB:
|
|
stc
|
|
jmp short Exit_Alloc_BCB
|
|
|
|
AllocInitBadClusBitmap endp
|
|
|
|
|
|
;*** SetUpBadClusTransfer - Set things up to copy bad clusters from the current
|
|
; disk to the new disk.
|
|
;
|
|
; DS -> data
|
|
;
|
|
SetUpBadClusTransfer proc near
|
|
assume DS:DATA,ES:NOTHING
|
|
|
|
mov word ptr BadClusBitMap,0
|
|
mov word ptr BadClusBitMap+2,0
|
|
cmp FATNotAllInMem,0
|
|
.386
|
|
je InitFatWithBad
|
|
call DetermineExistingFormatNoMsg
|
|
cmc
|
|
jnc AllDone6 ; Drive isn't valid so no bad sectors
|
|
;
|
|
; Build a bit map of the bad clusters
|
|
;
|
|
message msgSetBadClus
|
|
|
|
.386
|
|
test fBig32FAT,0ffh ; See if 32 bit fat
|
|
jz short Tst16BitEntry ; If zero then 16 or 12 bit fat
|
|
mov EBX,00ffffff7h ; Set 32 bit value for bad cluster
|
|
jmp SHORT SetBdVal
|
|
|
|
Tst16BitEntry:
|
|
mov EBX,00000ff7h ; Set 12 bit value for bad cluster
|
|
test fBigFAT,0ffh ; See if 16 bit fat
|
|
jz short SetBdVal ; If zero then 12 bit fat
|
|
mov EBX,0000fff7h ; Set 16 bit value for bad cluster
|
|
SetBdVal:
|
|
mov CurrentCluster,2
|
|
mov BadClusValue,EBX
|
|
push ds
|
|
pop es ; following routines expect ES->DATA
|
|
ClusLoop:
|
|
call DisplayFatDonePcnt
|
|
|
|
mov EAX,CurrentCluster
|
|
call calc_sector_and_offset ; determine location of this entry
|
|
|
|
mov EBX,sector_in_buffer
|
|
mov EAX,sector_to_read
|
|
cmp EAX,EBX ; check if required sector is in buffer
|
|
je short DontHaveToRead2
|
|
|
|
call ReadFatSector ; read a sector of the FAT into buffer
|
|
jc short AllDoneDoCRLFErr
|
|
|
|
DontHaveToRead2:
|
|
mov EAX,CurrentCluster ; EAX = current cluster
|
|
xor CX,CX ; ECX = get cluster contents signal
|
|
push ds
|
|
lds SI,FatSector ; DS:SI --> FAT buffer
|
|
call GetFatSectorEntry ; EAX = contents of FAT entry
|
|
pop ds
|
|
cmp EAX,BadClusValue ; Is this cluster marked bad?
|
|
jne short NextClus ; If EAX<>EBX good cluster
|
|
|
|
call AllocInitBadClusBitmap ; Does nothing if BadClusBitMap
|
|
jc short AllDoneDoCRLFErr ; already exists
|
|
|
|
mov EAX,CurrentCluster ; EAX = this cluster number
|
|
push ds
|
|
lds si,BadClusBitMap
|
|
mov ebx,eax
|
|
shr ebx,19 ; (E)BX is "64k index" of this bit
|
|
and eax,00007FFFFh ; bit index in that 64k
|
|
mov cx,ds
|
|
add cx,bx ; Go to correct 64k piece
|
|
mov ds,cx
|
|
bts dword ptr [si],eax ; Set the bit
|
|
pop ds
|
|
NextClus:
|
|
inc CurrentCluster ; go to next cluster
|
|
mov EAX,CurrentCluster
|
|
mov EBX,TotalClusters
|
|
cmp EAX,EBX ; check for last cluster in FAT
|
|
.8086
|
|
jna ClusLoop
|
|
|
|
message msgSetBadClusDone
|
|
|
|
jmp short AllDone6Ok
|
|
|
|
AllDoneDoCRLFErr:
|
|
message msgCRLF
|
|
stc
|
|
jmp short AllDone6
|
|
|
|
InitFatWithBad:
|
|
call load_old_fat ; load old FAT
|
|
call mark_non_bad_as_free ; mark anything not BAD as FREE
|
|
AllDone6Ok:
|
|
clc
|
|
AllDone6:
|
|
ret
|
|
|
|
SetUpBadClusTransfer endp
|
|
|
|
;*** mark_non_bad_as_free -- mark all non-bad blocks as free in the FAT
|
|
;
|
|
; WARNING: Do not call this if FATNotAllInMem is TRUE
|
|
;
|
|
mark_non_bad_as_free proc near
|
|
|
|
assume ds:nothing, es:DATA
|
|
|
|
.386
|
|
test fBig32FAT,0ffh ; See if 32 bit fat
|
|
mov ebx,00ffffff7h ; get bad value for 32-bit
|
|
jnz short mark_non_bad_1
|
|
test fBigFAT,0ffh ; See if 16 bit fat
|
|
mov ebx,0fff7h ; get bad value for 16-bit
|
|
jnz short mark_non_bad_1
|
|
and bh,0fh ; get the 0ff7h for 12-bit
|
|
mark_non_bad_1:
|
|
mov eax,2 ; cluster number
|
|
|
|
mark_non_bad_2:
|
|
push ds
|
|
lds si,FatSpace ; point to the FAT buffer
|
|
mov ecx,0fffffffeh ; get the FAT entry
|
|
;; Manual to disable compile warning
|
|
;; push eax ; save cluster number
|
|
db 066h,050h
|
|
;; push ebx ; save bad value
|
|
db 066h,053h
|
|
call GetSetFatEntry ; read the cluster value
|
|
;; pop ebx
|
|
db 066h,05Bh
|
|
cmp eax,ebx ; is it bad?
|
|
jz short mark_non_bad_3 ; skip if so (leave alone)
|
|
|
|
;; pop eax ; get the cluster number
|
|
db 066h,058h
|
|
;; push eax
|
|
db 066h,050h
|
|
;; push ebx
|
|
db 066h,053h
|
|
xor ecx,ecx ; set FAT entry to FREE
|
|
call GetSetFatEntry
|
|
;; pop ebx
|
|
db 066h,05Bh
|
|
|
|
mark_non_bad_3:
|
|
;; pop eax ; restore cluster number
|
|
db 066h,058h
|
|
pop ds
|
|
inc eax
|
|
cmp eax,TotalClusters
|
|
jna mark_non_bad_2
|
|
.8086
|
|
ret
|
|
|
|
mark_non_bad_as_free endp
|
|
|
|
;*** load_old_fat -- loads the FAT from the existing media into FatSpace
|
|
;
|
|
; WARNING: Do not call this if FATNotAllInMem is TRUE
|
|
;
|
|
; If not properly formatted, will just terminate.
|
|
; If any error reading FAT, will zero entire FAT via Fat_Init.
|
|
|
|
load_old_fat proc near
|
|
|
|
mov SI,DATA
|
|
mov ES,SI ; Set ES to data segment
|
|
|
|
assume ES:DATA,DS:Nothing ; Assembler directive
|
|
push ds
|
|
call DetermineExistingFormatNoMsg
|
|
jc load_old_fat_error
|
|
|
|
call init_fat_with_header
|
|
|
|
mov CX, DeviceParameters.DP_BPB.oldBPB.BPB_SectorsPerFat
|
|
.errnz EDP_BPB NE DP_BPB
|
|
or cx, cx
|
|
jnz short GotFSz
|
|
;
|
|
; We KNOW the high word must be 0 since whole FAT fits in memory
|
|
;
|
|
mov cx, DeviceParameters.DP_BPB.BGBPB_BigSectorsPerFat
|
|
GotFSz:
|
|
mov DX,DeviceParameters.DP_BPB.oldBPB.BPB_ReservedSectors ;starting sector
|
|
mov AL,DriveToFormat
|
|
|
|
lds bx,FatSpace
|
|
|
|
load_old_fat_1:
|
|
jcxz load_old_fat_done ; exit when done
|
|
|
|
ifdef NEC_98
|
|
push cx ; save size to write
|
|
cmp cx,10h ; need more than 40h secs?
|
|
jb load_old_fat_2 ; skip if we can get it all
|
|
|
|
mov cx,10h ; clip to max
|
|
|
|
load_old_fat_2:
|
|
push AX ; save AX
|
|
call Read_Disk ; read it
|
|
pop AX ; restore AX
|
|
pop CX ; restore CX
|
|
jc load_old_fat_error ; exit if error
|
|
|
|
push ax
|
|
mov ax,ds
|
|
add ax,es:DeviceParameters.DP_BPB.BPB_BytesPerSector; adjust segment
|
|
mov ds,ax
|
|
pop ax
|
|
add DX,10h
|
|
sub CX,10h
|
|
ja load_old_fat_1 ; loop until done
|
|
else
|
|
push cx ; save size to write
|
|
cmp cx,40h ; need more than 40h secs?
|
|
jb load_old_fat_2 ; skip if we can get it all
|
|
|
|
mov cx,40h ; clip to max
|
|
|
|
load_old_fat_2:
|
|
push AX ; save AX
|
|
call Read_Disk ; read it
|
|
pop AX ; restore AX
|
|
pop CX ; restore CX
|
|
jc load_old_fat_error ; exit if error
|
|
|
|
push ax
|
|
mov ax,ds
|
|
add ax,40h*512/16 ; adjust segment
|
|
mov ds,ax
|
|
pop ax
|
|
add DX,40h
|
|
sub CX,40h
|
|
ja load_old_fat_1 ; loop until done
|
|
endif
|
|
|
|
load_old_fat_done:
|
|
pop ds
|
|
jmp short init_fat_header
|
|
|
|
load_old_fat_error:
|
|
pop ds
|
|
if2
|
|
.errnz (offset $) - (offset init_fat_with_header) ; fall thru!
|
|
endif
|
|
|
|
load_old_fat endp
|
|
|
|
;*** init_fat_with_header -- Do a Fat_Init, and then put bytes at front
|
|
;
|
|
; alternate entry point: init_fat_header (just fill in header)
|
|
|
|
init_fat_with_header proc near
|
|
|
|
assume ds:nothing, es:DATA
|
|
|
|
mov DI,DATA
|
|
mov ES,DI
|
|
call Fat_Init
|
|
init_fat_header:
|
|
push ES
|
|
|
|
push es
|
|
pop ds ; get ds -> DATA
|
|
|
|
assume ds:DATA
|
|
les DI, FatSpace ; ES:DI --> FatSpace buffer
|
|
assume es:nothing ; Store media descriptor byte
|
|
mov AL, DeviceParameters.DP_BPB.oldBPB.BPB_MediaDescriptor
|
|
.errnz EDP_BPB NE DP_BPB
|
|
ifdef NEC_98
|
|
cmp AL,Fixed_Disk ;FAT-ID twisted (for HD and 5"MO)
|
|
jne @F ; F8h --> FEh (Only FAT-ID)
|
|
mov AL,Single_8_Media ;it is NEC_98 local.
|
|
@@:
|
|
endif
|
|
mov AH, 0ffH
|
|
stosw ; Cluster 0 start
|
|
mov al,ah
|
|
stosb ; cluster 0 if 32 bit else cluster 1
|
|
test fBig32Fat, TRUE
|
|
jz Not32
|
|
stosb ; finish cluster 0 dword
|
|
stosw ; cluster 1 dword
|
|
and ah,0Fh ; High nibble reserved, zero it.
|
|
stosw
|
|
sub di,5 ; Go back to high byte of cluster 0
|
|
mov al,ah
|
|
stosb ; High nibble reserved, zero it.
|
|
jmp short NotBig
|
|
|
|
Not32:
|
|
test fBigFat, TRUE
|
|
jz NotBig
|
|
stosb ; finish cluster 1 word
|
|
NotBig:
|
|
pop ES
|
|
ret
|
|
|
|
init_fat_with_header endp
|
|
|
|
;**** IsThisClusterBad
|
|
;
|
|
; ENTRY: EAX is cluster #
|
|
;
|
|
; EXIT: Zero set if cluster bad
|
|
;
|
|
; USES: EBX,ECX,EDX,FLAGS
|
|
;
|
|
IsThisClusterBad proc near
|
|
assume ds:data, es:data
|
|
|
|
push ds
|
|
push si
|
|
.386
|
|
;; push eax
|
|
db 066h,050h
|
|
|
|
cmp FATNotAllInMem,0
|
|
je short ChkInMemFat
|
|
cmp BadClusBitMap,0 ; Anything marked?
|
|
je short NotBadRet ; Nope
|
|
lds si,BadClusBitMap
|
|
assume DS:nothing
|
|
mov ebx,eax
|
|
shr ebx,19 ; (E)BX is "64k index" of this bit
|
|
and eax,00007FFFFh ; bit index in that 64k
|
|
mov cx,ds
|
|
add cx,bx ; Go to correct 64k piece
|
|
mov ds,cx
|
|
bt dword ptr [si],eax ; Bad cluster?
|
|
jnc short NotBadRet ; No
|
|
mov bx,0FFFFh ; Set so following inc sets ZERO
|
|
NotBadRet:
|
|
inc bx
|
|
PopRet:
|
|
;; pop eax ; restore cluster number
|
|
db 066h,058h
|
|
.8086
|
|
pop si
|
|
pop ds
|
|
ret
|
|
|
|
ChkInMemFat:
|
|
.386
|
|
assume DS:data
|
|
test fBig32FAT,0ffh
|
|
jz short Tst16BitEnt
|
|
mov EBX,00ffffff7h
|
|
jmp SHORT SetBVal
|
|
|
|
Tst16BitEnt:
|
|
mov EBX,00000ff7h
|
|
test fBigFAT,0ffh
|
|
jz short SetBVal
|
|
mov EBX,0000fff7h
|
|
SetBVal:
|
|
mov BadClusValue,EBX
|
|
mov ECX,0fffffffeh ; ECX = Get value
|
|
lds SI,FatSpace
|
|
assume DS:nothing
|
|
call GetSetFatEntry
|
|
cmp eax,es:BadClusValue
|
|
.8086
|
|
jmp short PopRet
|
|
|
|
IsThisClusterBad endp
|
|
|
|
;**** WrtEOFMrkInRootClus
|
|
;
|
|
; ENTRY: None
|
|
;
|
|
; EXIT: EOF mark written into root directory staring cluster
|
|
;
|
|
; USES: EAX,EBX,ECX,EDX,FLAGS
|
|
;
|
|
WrtEOFMrkInRootClus proc near
|
|
assume ds:data, es:data
|
|
push ds
|
|
push si
|
|
;
|
|
; In FATNotAllInMem case FlushFatBuf will take care of putting
|
|
; an eof mark in the root clus
|
|
;
|
|
cmp FATNotAllInMem,0
|
|
jne SetDone
|
|
test fBig32FAT,0ffh ; See if 32 bit fat
|
|
jz SetDone ; No
|
|
.386
|
|
mov eax,dword ptr DeviceParameters.DP_BPB.BGBPB_RootDirStrtClus
|
|
.errnz EDP_BPB NE DP_BPB
|
|
cmp eax,2
|
|
jb short SetDone
|
|
cmp eax,TotalClusters
|
|
ja short SetDone
|
|
mov ECX,00fffffffh
|
|
.8086
|
|
lds SI,FatSpace
|
|
assume DS:nothing
|
|
call GetSetFatEntry
|
|
SetDone:
|
|
pop si
|
|
pop ds
|
|
ret
|
|
|
|
WrtEOFMrkInRootClus endp
|
|
|
|
|
|
CODE ENDS
|
|
|
|
END
|