[128] | 1 | ; Project name : XTIDE Universal BIOS
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[3] | 2 | ; Description : Int 13h function AH=0h, Disk Controller Reset.
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| 3 |
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| 4 | ; Section containing code
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| 5 | SECTION .text
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| 6 |
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| 7 | ;--------------------------------------------------------------------
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| 8 | ; Int 13h function AH=0h, Disk Controller Reset.
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| 9 | ;
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[271] | 10 | ; Note: We handle all AH=0h calls, even for drives handled by other
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| 11 | ; BIOSes!
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| 12 | ;
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[3] | 13 | ; AH0h_HandlerForDiskControllerReset
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| 14 | ; Parameters:
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[148] | 15 | ; DL: Translated Drive number (ignored so all drives are reset)
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[3] | 16 | ; If bit 7 is set all hard disks and floppy disks reset.
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[275] | 17 | ; DS:DI: Ptr to DPT (or Null if foreign drive)
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[150] | 18 | ; SS:BP: Ptr to IDEPACK
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| 19 | ; Returns with INTPACK:
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[23] | 20 | ; AH: Int 13h return status (from drive requested in DL)
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[3] | 21 | ; CF: 0 if succesfull, 1 if error
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| 22 | ;--------------------------------------------------------------------
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| 23 | ALIGN JUMP_ALIGN
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| 24 | AH0h_HandlerForDiskControllerReset:
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[23] | 25 | eMOVZX bx, dl ; Copy requested drive to BL, zero BH to assume no errors
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[26] | 26 | call ResetFloppyDrivesWithInt40h
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[259] | 27 |
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| 28 | %ifdef MODULE_SERIAL_FLOPPY
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| 29 | ;
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| 30 | ; "Reset" emulatd serial floppy drives, if any. There is nothing to actually do for this reset,
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| 31 | ; but record the proper error return code if one of these floppy drives is the drive requested.
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| 32 | ;
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| 33 | call RamVars_UnpackFlopCntAndFirstToAL
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| 34 | cbw ; Clears AH (there are flop drives) or ffh (there are not)
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| 35 | ; Either AH has success code (flop drives are present)
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| 36 | ; or it doesn't matter because we won't match drive ffh
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| 37 |
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| 38 | cwd ; clears DX (there are flop drives) or ffffh (there are not)
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| 39 |
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| 40 | adc dl, al ; second drive (CF set) if present
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| 41 | ; If no drive is present, this will result in ffh which
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| 42 | ; won't match a drive
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| 43 | call BackupErrorCodeFromTheRequestedDriveToBH
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| 44 | mov dl, al ; We may end up doing the first drive twice (if there is
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| 45 | call BackupErrorCodeFromTheRequestedDriveToBH ; only one drive), but doing it again is not harmful.
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| 46 | %endif
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| 47 |
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| 48 | test bl, bl ; If we were called with a floppy disk, then we are done,
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| 49 | jns SHORT .SkipHardDiskReset ; don't do hard disks.
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| 50 |
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[26] | 51 | call ResetForeignHardDisks
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[264] | 52 |
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[275] | 53 | ; Resetting our hard disks will modify dl and bl to be idevars offset based instead of drive number based,
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| 54 | ; such that this call must be the last in the list of reset routines called.
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| 55 | ;
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[282] | 56 | ; This needs to happen after ResetForeignHardDisks, as that call may have set the error code for 80h,
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| 57 | ; and we need to override that value if we are xlate'd into 80h with one of our drives.
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| 58 | ;
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[271] | 59 | call ResetHardDisksHandledByOurBIOS
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[264] | 60 |
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[26] | 61 | .SkipHardDiskReset:
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[148] | 62 | mov ah, bh
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| 63 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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[3] | 64 |
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| 65 |
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| 66 | ;--------------------------------------------------------------------
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[26] | 67 | ; ResetFloppyDrivesWithInt40h
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[3] | 68 | ; Parameters:
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[23] | 69 | ; BL: Requested drive (DL when entering AH=00h)
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| 70 | ; Returns:
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| 71 | ; BH: Error code from requested drive (if available)
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| 72 | ; Corrupts registers:
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[27] | 73 | ; AX, DL, DI
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[128] | 74 | ;--------------------------------------------------------------------
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[26] | 75 | ResetFloppyDrivesWithInt40h:
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[271] | 76 | call GetDriveNumberForForeignHardDiskHandlerToDL
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[27] | 77 | and dl, 7Fh ; Clear hard disk bit
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[26] | 78 | xor ah, ah ; Disk Controller Reset
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[148] | 79 | int BIOS_DISKETTE_INTERRUPT_40h
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[26] | 80 | jmp SHORT BackupErrorCodeFromTheRequestedDriveToBH
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[23] | 81 |
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| 82 |
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| 83 | ;--------------------------------------------------------------------
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[26] | 84 | ; ResetForeignHardDisks
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[23] | 85 | ; Parameters:
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| 86 | ; BL: Requested drive (DL when entering AH=00h)
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[3] | 87 | ; DS: RAMVARS segment
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| 88 | ; Returns:
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[23] | 89 | ; BH: Error code from requested drive (if available)
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[3] | 90 | ; Corrupts registers:
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[27] | 91 | ; AX, DL, DI
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[128] | 92 | ;--------------------------------------------------------------------
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[26] | 93 | ResetForeignHardDisks:
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[271] | 94 | call GetDriveNumberForForeignHardDiskHandlerToDL
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[27] | 95 | xor ah, ah ; Disk Controller Reset
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[32] | 96 | call Int13h_CallPreviousInt13hHandler
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[258] | 97 | ;;; fall-through to BackupErrorCodeFromTheRequestedDriveToBH
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[23] | 98 |
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[26] | 99 |
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[3] | 100 | ;--------------------------------------------------------------------
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[258] | 101 | ; BackupErrorCodeFromTheRequestedDriveToBH
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| 102 | ; Parameters:
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| 103 | ; AH: Error code from the last resetted drive
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| 104 | ; DL: Drive last resetted
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| 105 | ; BL: Requested drive (DL when entering AH=00h)
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| 106 | ; Returns:
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| 107 | ; BH: Backuped error code
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| 108 | ; Corrupts registers:
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| 109 | ; Nothing
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| 110 | ;--------------------------------------------------------------------
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| 111 | BackupErrorCodeFromTheRequestedDriveToBH:
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| 112 | cmp dl, bl ; Requested drive?
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| 113 | eCMOVE bh, ah
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| 114 | ret
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| 115 |
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[271] | 116 |
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[258] | 117 | ;--------------------------------------------------------------------
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[271] | 118 | ; GetDriveNumberForForeignHardDiskHandlerToDL
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[27] | 119 | ; Parameters:
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| 120 | ; BL: Requested drive (DL when entering AH=00h)
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| 121 | ; DS: RAMVARS segment
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| 122 | ; Returns:
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[275] | 123 | ; DS:DI: Ptr to DPT if our drive (or Null if foreign drive)
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[27] | 124 | ; DL: BL if foreign drive
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| 125 | ; 80h if our drive
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[128] | 126 | ;--------------------------------------------------------------------
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[271] | 127 | GetDriveNumberForForeignHardDiskHandlerToDL:
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[27] | 128 | mov dl, bl
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[275] | 129 | test di, di
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| 130 | jz SHORT .Return
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[271] | 131 | mov dl, 80h ; First possible Hard Disk should be safe value
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[275] | 132 | .Return:
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[27] | 133 | ret
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| 134 |
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[275] | 135 | AH0h_ResetAllOurHardDisksAtTheEndOfDriveInitialization equ ResetHardDisksHandledByOurBIOS.ErrorCodeNotUsed
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[27] | 136 |
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| 137 | ;--------------------------------------------------------------------
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[271] | 138 | ; ResetHardDisksHandledByOurBIOS
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| 139 | ; Parameters:
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| 140 | ; DS:DI: Ptr to DPT for requested drive
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[282] | 141 | ; If DPT pointer is not available, or error result in BH won't be used anyway,
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| 142 | ; enter through .ErrorCodeNotUsed.
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[271] | 143 | ; SS:BP: Ptr to IDEPACK
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| 144 | ; Returns:
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[23] | 145 | ; BH: Error code from requested drive (if available)
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| 146 | ; Corrupts registers:
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[275] | 147 | ; AX, BX, CX, DX, SI, DI
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[23] | 148 | ;--------------------------------------------------------------------
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[271] | 149 | ResetHardDisksHandledByOurBIOS:
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[282] | 150 | mov bl, 0 ; Assume Null IdevarsOffset for now, assuming foreign drive
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| 151 | test di, di
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| 152 | jz .ErrorCodeNotUsed
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[264] | 153 | mov bl, [di+DPT.bIdevarsOffset] ; replace drive number with Idevars pointer for cmp with dl
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[282] | 154 |
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| 155 | .ErrorCodeNotUsed: ; BH will be garbage on exit if thie entry point is used,
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[275] | 156 | ; but reset of all drives will still happen
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| 157 |
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[264] | 158 | mov dl, ROMVARS.ideVars0 ; starting Idevars offset
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| 159 |
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[271] | 160 | call RamVars_GetIdeControllerCountToCX ; get count of ide controllers
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[264] | 161 | jcxz .done ; just in case bIdeCnt is zero (shouldn't be)
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[262] | 162 | .loop:
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[271] | 163 | call FindDPT_ForIdevarsOffsetInDL ; look for the first drive on this controller, if any
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[262] | 164 | jc .notFound
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[264] | 165 |
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[262] | 166 | call AHDh_ResetDrive ; reset master and slave on that controller
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[264] | 167 | call BackupErrorCodeFromTheRequestedDriveToBH ; save error code if same controller as drive from entry
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| 168 |
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[262] | 169 | .notFound:
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[264] | 170 | add dl, IDEVARS_size ; move Idevars pointer forward
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| 171 | loop .loop
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| 172 |
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| 173 | .done:
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[259] | 174 | ret
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