[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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[376] | 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team. |
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| 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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| 41 | xor bx, bx ; Zero BH to assume no errors |
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| 42 | or bl, dl ; Copy requested drive to BL |
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| 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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[433] | 100 | ; This defines what is called when resetting our drives at the end of drive detection. |
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[275] | 101 | AH0h_ResetAllOurHardDisksAtTheEndOfDriveInitialization equ ResetHardDisksHandledByOurBIOS.ErrorCodeNotUsed |
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[27] | 102 | |
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| 103 | ;-------------------------------------------------------------------- |
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[271] | 104 | ; ResetHardDisksHandledByOurBIOS |
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| 105 | ; Parameters: |
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[501] | 106 | ; BL: Requested drive (DL when entering AH=00h) |
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[271] | 107 | ; DS:DI: Ptr to DPT for requested drive |
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[294] | 108 | ; If DPT pointer is not available, or error result in BH won't be used anyway, |
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[282] | 109 | ; enter through .ErrorCodeNotUsed. |
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[271] | 110 | ; SS:BP: Ptr to IDEPACK |
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| 111 | ; Returns: |
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[23] | 112 | ; BH: Error code from requested drive (if available) |
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| 113 | ; Corrupts registers: |
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[275] | 114 | ; AX, BX, CX, DX, SI, DI |
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[23] | 115 | ;-------------------------------------------------------------------- |
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[271] | 116 | ResetHardDisksHandledByOurBIOS: |
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[294] | 117 | xor bl, bl ; Assume Null IdevarsOffset for now, assuming foreign drive |
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[282] | 118 | test di, di |
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[433] | 119 | jz SHORT .ErrorCodeNotUsed |
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[264] | 120 | mov bl, [di+DPT.bIdevarsOffset] ; replace drive number with Idevars pointer for cmp with dl |
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[294] | 121 | |
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| 122 | .ErrorCodeNotUsed: ; BH will be garbage on exit if this entry point is used, |
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[275] | 123 | ; but reset of all drives will still happen |
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| 124 | |
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[264] | 125 | mov dl, ROMVARS.ideVars0 ; starting Idevars offset |
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| 126 | |
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[491] | 127 | ; Get count of ALL Idevars structures, not just the ones that are configured. This may seem odd, |
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[316] | 128 | ; but it catches the .ideVarsSerialAuto structure, which would not be scanned if the count from |
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| 129 | ; RamVars_GetIdeControllerCountToCX was used. Unused controllers won't make a difference, since no DPT |
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| 130 | ; will point to them. Performance isn't an issue, as this is a reset operation. |
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| 131 | ; |
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| 132 | mov cx, (ROMVARS.ideVarsEnd - ROMVARS.ideVarsBegin) / IDEVARS_size |
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| 133 | |
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[262] | 134 | .loop: |
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[271] | 135 | call FindDPT_ForIdevarsOffsetInDL ; look for the first drive on this controller, if any |
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[433] | 136 | jc SHORT .notFound |
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[264] | 137 | |
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[262] | 138 | call AHDh_ResetDrive ; reset master and slave on that controller |
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[264] | 139 | call BackupErrorCodeFromTheRequestedDriveToBH ; save error code if same controller as drive from entry |
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| 140 | |
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[262] | 141 | .notFound: |
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[264] | 142 | add dl, IDEVARS_size ; move Idevars pointer forward |
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| 143 | loop .loop |
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| 144 | |
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| 145 | .done: |
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[259] | 146 | ret |
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