[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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[376] | 4 | ;
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[491] | 5 | ; XTIDE Universal BIOS and Associated Tools
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[526] | 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team.
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[376] | 7 | ;
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| 8 | ; This program is free software; you can redistribute it and/or modify
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| 9 | ; it under the terms of the GNU General Public License as published by
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| 10 | ; the Free Software Foundation; either version 2 of the License, or
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| 11 | ; (at your option) any later version.
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[491] | 12 | ;
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[376] | 13 | ; This program is distributed in the hope that it will be useful,
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| 14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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[491] | 16 | ; GNU General Public License for more details.
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[376] | 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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[491] | 18 | ;
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[376] | 19 |
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[3] | 20 | ; Section containing code
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| 21 | SECTION .text
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| 22 |
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| 23 | ;--------------------------------------------------------------------
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| 24 | ; Int 13h function AH=0h, Disk Controller Reset.
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| 25 | ;
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[271] | 26 | ; Note: We handle all AH=0h calls, even for drives handled by other
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| 27 | ; BIOSes!
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| 28 | ;
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[3] | 29 | ; AH0h_HandlerForDiskControllerReset
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| 30 | ; Parameters:
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[148] | 31 | ; DL: Translated Drive number (ignored so all drives are reset)
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[3] | 32 | ; If bit 7 is set all hard disks and floppy disks reset.
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[275] | 33 | ; DS:DI: Ptr to DPT (or Null if foreign drive)
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[150] | 34 | ; SS:BP: Ptr to IDEPACK
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| 35 | ; Returns with INTPACK:
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[23] | 36 | ; AH: Int 13h return status (from drive requested in DL)
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[294] | 37 | ; CF: 0 if successful, 1 if error
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[3] | 38 | ;--------------------------------------------------------------------
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| 39 | AH0h_HandlerForDiskControllerReset:
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[503] | 40 | ; Reset foreign Floppy and Hard Drives (those handled by other BIOSes)
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[505] | 41 | eMOVZX bx, dl ; Copy requested drive to BL and zero BH to assume no errors
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| 42 |
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[503] | 43 | xor ah, ah ; Disk Controller Reset
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| 44 | call Int13h_CallPreviousInt13hHandler ; Reset floppy drives only or floppy drives and foreign hard disks
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| 45 | call BackupErrorCodeFromTheRequestedDriveToBH
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[259] | 46 |
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| 47 | %ifdef MODULE_SERIAL_FLOPPY
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| 48 | ;
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[294] | 49 | ; "Reset" emulated serial floppy drives, if any. There is nothing to actually do for this reset,
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[259] | 50 | ; but record the proper error return code if one of these floppy drives is the drive requested.
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| 51 | ;
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| 52 | call RamVars_UnpackFlopCntAndFirstToAL
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| 53 | cbw ; Clears AH (there are flop drives) or ffh (there are not)
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| 54 | ; Either AH has success code (flop drives are present)
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| 55 | ; or it doesn't matter because we won't match drive ffh
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| 56 |
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| 57 | cwd ; clears DX (there are flop drives) or ffffh (there are not)
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| 58 |
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| 59 | adc dl, al ; second drive (CF set) if present
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[294] | 60 | ; If no drive is present, this will result in ffh which
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[259] | 61 | ; won't match a drive
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| 62 | call BackupErrorCodeFromTheRequestedDriveToBH
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| 63 | mov dl, al ; We may end up doing the first drive twice (if there is
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| 64 | call BackupErrorCodeFromTheRequestedDriveToBH ; only one drive), but doing it again is not harmful.
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| 65 | %endif
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| 66 | test bl, bl ; If we were called with a floppy disk, then we are done,
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| 67 | jns SHORT .SkipHardDiskReset ; don't do hard disks.
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[264] | 68 |
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[294] | 69 | ; Resetting our hard disks will modify dl and bl to be idevars offset based instead of drive number based,
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[275] | 70 | ; such that this call must be the last in the list of reset routines called.
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| 71 | ;
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[501] | 72 | ; This needs to happen after ResetForeignDrives, as that call may have set the error code for 80h,
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[282] | 73 | ; and we need to override that value if we are xlate'd into 80h with one of our drives.
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| 74 | ;
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[294] | 75 | call ResetHardDisksHandledByOurBIOS
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[264] | 76 |
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[26] | 77 | .SkipHardDiskReset:
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[148] | 78 | mov ah, bh
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| 79 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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[3] | 80 |
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| 81 |
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| 82 | ;--------------------------------------------------------------------
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[258] | 83 | ; BackupErrorCodeFromTheRequestedDriveToBH
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| 84 | ; Parameters:
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| 85 | ; AH: Error code from the last resetted drive
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| 86 | ; DL: Drive last resetted
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| 87 | ; BL: Requested drive (DL when entering AH=00h)
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| 88 | ; Returns:
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| 89 | ; BH: Backuped error code
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| 90 | ; Corrupts registers:
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| 91 | ; Nothing
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| 92 | ;--------------------------------------------------------------------
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| 93 | BackupErrorCodeFromTheRequestedDriveToBH:
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| 94 | cmp dl, bl ; Requested drive?
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| 95 | eCMOVE bh, ah
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| 96 | ret
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| 97 |
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[271] | 98 |
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[27] | 99 | ;--------------------------------------------------------------------
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[271] | 100 | ; ResetHardDisksHandledByOurBIOS
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| 101 | ; Parameters:
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[501] | 102 | ; BL: Requested drive (DL when entering AH=00h)
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[271] | 103 | ; DS:DI: Ptr to DPT for requested drive
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[294] | 104 | ; If DPT pointer is not available, or error result in BH won't be used anyway,
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[282] | 105 | ; enter through .ErrorCodeNotUsed.
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[271] | 106 | ; SS:BP: Ptr to IDEPACK
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| 107 | ; Returns:
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[23] | 108 | ; BH: Error code from requested drive (if available)
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| 109 | ; Corrupts registers:
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[275] | 110 | ; AX, BX, CX, DX, SI, DI
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[23] | 111 | ;--------------------------------------------------------------------
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[271] | 112 | ResetHardDisksHandledByOurBIOS:
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[294] | 113 | xor bl, bl ; Assume Null IdevarsOffset for now, assuming foreign drive
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[282] | 114 | test di, di
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[433] | 115 | jz SHORT .ErrorCodeNotUsed
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[264] | 116 | mov bl, [di+DPT.bIdevarsOffset] ; replace drive number with Idevars pointer for cmp with dl
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[521] | 117 | .ErrorCodeNotUsed: ; BH will be garbage on exit if this entry point is used,
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[275] | 118 | ; but reset of all drives will still happen
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[264] | 119 | mov dl, ROMVARS.ideVars0 ; starting Idevars offset
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| 120 |
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[567] | 121 | ; Get count of ALL Idevars structures, not just the ones that are configured. This may seem odd,
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| 122 | ; but it catches the .ideVarsSerialAuto structure, which would not be scanned if the count from
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[316] | 123 | ; RamVars_GetIdeControllerCountToCX was used. Unused controllers won't make a difference, since no DPT
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| 124 | ; will point to them. Performance isn't an issue, as this is a reset operation.
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[567] | 125 | ;
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[507] | 126 | mov cx, NUMBER_OF_IDEVARS
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[316] | 127 |
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[592] | 128 | .Loop:
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[521] | 129 | call FindDPT_MasterOrSingleForIdevarsOffsetInDL
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| 130 | jc SHORT .ControllerNotAvailable
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[264] | 131 |
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[521] | 132 | ; Reset controller (both Master and Slave Drive). We ignore error codes
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| 133 | ; here since initialization is the one that matters.
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[507] | 134 | push cx
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| 135 | push dx
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[521] | 136 | push bx
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[507] | 137 | %ifdef MODULE_IRQ
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| 138 | call Interrupts_UnmaskInterruptControllerForDriveInDSDI
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| 139 | %endif
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[521] | 140 | call Device_ResetMasterAndSlaveController
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[507] | 141 | %ifdef MODULE_ADVANCED_ATA
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[521] | 142 | call AdvAtaInit_InitializeControllerForDPTinDSDI
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[507] | 143 | %endif
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[521] | 144 | pop bx
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| 145 | pop dx
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[520] | 146 |
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[521] | 147 | ; Initialize Master Drive
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| 148 | call AH9h_InitializeDriveForUse ; Initialize Master drive
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| 149 | call BackupErrorCodeFromTheRequestedDriveToBH
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[520] | 150 |
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[521] | 151 | ; Initialize Slave Drive
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| 152 | call FindDPT_SlaveForIdevarsOffsetInDL
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| 153 | jc SHORT .SlaveDriveNotAvailable
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| 154 | call AH9h_InitializeDriveForUse
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| 155 | ; Here we have a small problem. Since DL now has offset to IDEVARS, it will be the same
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| 156 | ; for both Master and Slave Drive. We simply ignore error from slave drive reset since most
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| 157 | ; systems do not have slave drives at all and it is unlikely that AH=00h would be called for
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| 158 | ; specific drive anyway. AH=Dh is for that.
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[520] | 159 |
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[521] | 160 | .SlaveDriveNotAvailable:
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| 161 | pop cx
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| 162 | .ControllerNotAvailable:
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| 163 | add dl, IDEVARS_size ; move Idevars pointer forward
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[592] | 164 | loop .Loop
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[520] | 165 | ret
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