[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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[294] | 21 | ; CF: 0 if successful, 1 if error |
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[3] | 22 | ;-------------------------------------------------------------------- |
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| 23 | AH0h_HandlerForDiskControllerReset: |
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[23] | 24 | eMOVZX bx, dl ; Copy requested drive to BL, zero BH to assume no errors |
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[26] | 25 | call ResetFloppyDrivesWithInt40h |
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[259] | 26 | |
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| 27 | %ifdef MODULE_SERIAL_FLOPPY |
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| 28 | ; |
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[294] | 29 | ; "Reset" emulated serial floppy drives, if any. There is nothing to actually do for this reset, |
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[259] | 30 | ; but record the proper error return code if one of these floppy drives is the drive requested. |
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| 31 | ; |
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| 32 | call RamVars_UnpackFlopCntAndFirstToAL |
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| 33 | cbw ; Clears AH (there are flop drives) or ffh (there are not) |
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| 34 | ; Either AH has success code (flop drives are present) |
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| 35 | ; or it doesn't matter because we won't match drive ffh |
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| 36 | |
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| 37 | cwd ; clears DX (there are flop drives) or ffffh (there are not) |
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| 38 | |
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| 39 | adc dl, al ; second drive (CF set) if present |
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[294] | 40 | ; If no drive is present, this will result in ffh which |
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[259] | 41 | ; won't match a drive |
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| 42 | call BackupErrorCodeFromTheRequestedDriveToBH |
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| 43 | mov dl, al ; We may end up doing the first drive twice (if there is |
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| 44 | call BackupErrorCodeFromTheRequestedDriveToBH ; only one drive), but doing it again is not harmful. |
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| 45 | %endif |
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| 46 | |
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| 47 | test bl, bl ; If we were called with a floppy disk, then we are done, |
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| 48 | jns SHORT .SkipHardDiskReset ; don't do hard disks. |
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[294] | 49 | |
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[26] | 50 | call ResetForeignHardDisks |
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[264] | 51 | |
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[294] | 52 | ; Resetting our hard disks will modify dl and bl to be idevars offset based instead of drive number based, |
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[275] | 53 | ; such that this call must be the last in the list of reset routines called. |
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| 54 | ; |
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[282] | 55 | ; This needs to happen after ResetForeignHardDisks, as that call may have set the error code for 80h, |
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| 56 | ; and we need to override that value if we are xlate'd into 80h with one of our drives. |
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| 57 | ; |
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[294] | 58 | call ResetHardDisksHandledByOurBIOS |
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[264] | 59 | |
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[26] | 60 | .SkipHardDiskReset: |
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[148] | 61 | mov ah, bh |
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| 62 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH |
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[3] | 63 | |
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| 64 | |
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| 65 | ;-------------------------------------------------------------------- |
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[26] | 66 | ; ResetFloppyDrivesWithInt40h |
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[3] | 67 | ; Parameters: |
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[23] | 68 | ; BL: Requested drive (DL when entering AH=00h) |
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| 69 | ; Returns: |
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| 70 | ; BH: Error code from requested drive (if available) |
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| 71 | ; Corrupts registers: |
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[27] | 72 | ; AX, DL, DI |
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[128] | 73 | ;-------------------------------------------------------------------- |
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[26] | 74 | ResetFloppyDrivesWithInt40h: |
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[271] | 75 | call GetDriveNumberForForeignHardDiskHandlerToDL |
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[27] | 76 | and dl, 7Fh ; Clear hard disk bit |
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[26] | 77 | xor ah, ah ; Disk Controller Reset |
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[148] | 78 | int BIOS_DISKETTE_INTERRUPT_40h |
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[26] | 79 | jmp SHORT BackupErrorCodeFromTheRequestedDriveToBH |
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[23] | 80 | |
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| 81 | |
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| 82 | ;-------------------------------------------------------------------- |
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[26] | 83 | ; ResetForeignHardDisks |
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[23] | 84 | ; Parameters: |
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| 85 | ; BL: Requested drive (DL when entering AH=00h) |
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[3] | 86 | ; DS: RAMVARS segment |
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| 87 | ; Returns: |
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[23] | 88 | ; BH: Error code from requested drive (if available) |
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[3] | 89 | ; Corrupts registers: |
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[27] | 90 | ; AX, DL, DI |
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[128] | 91 | ;-------------------------------------------------------------------- |
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[26] | 92 | ResetForeignHardDisks: |
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[271] | 93 | call GetDriveNumberForForeignHardDiskHandlerToDL |
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[27] | 94 | xor ah, ah ; Disk Controller Reset |
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[32] | 95 | call Int13h_CallPreviousInt13hHandler |
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[258] | 96 | ;;; fall-through to BackupErrorCodeFromTheRequestedDriveToBH |
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[23] | 97 | |
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[26] | 98 | |
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[3] | 99 | ;-------------------------------------------------------------------- |
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[258] | 100 | ; BackupErrorCodeFromTheRequestedDriveToBH |
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| 101 | ; Parameters: |
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| 102 | ; AH: Error code from the last resetted drive |
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| 103 | ; DL: Drive last resetted |
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| 104 | ; BL: Requested drive (DL when entering AH=00h) |
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| 105 | ; Returns: |
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| 106 | ; BH: Backuped error code |
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| 107 | ; Corrupts registers: |
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| 108 | ; Nothing |
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| 109 | ;-------------------------------------------------------------------- |
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| 110 | BackupErrorCodeFromTheRequestedDriveToBH: |
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| 111 | cmp dl, bl ; Requested drive? |
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| 112 | eCMOVE bh, ah |
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| 113 | ret |
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| 114 | |
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[271] | 115 | |
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[258] | 116 | ;-------------------------------------------------------------------- |
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[271] | 117 | ; GetDriveNumberForForeignHardDiskHandlerToDL |
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[27] | 118 | ; Parameters: |
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| 119 | ; BL: Requested drive (DL when entering AH=00h) |
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| 120 | ; DS: RAMVARS segment |
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| 121 | ; Returns: |
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[275] | 122 | ; DS:DI: Ptr to DPT if our drive (or Null if foreign drive) |
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[27] | 123 | ; DL: BL if foreign drive |
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| 124 | ; 80h if our drive |
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[128] | 125 | ;-------------------------------------------------------------------- |
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[271] | 126 | GetDriveNumberForForeignHardDiskHandlerToDL: |
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[27] | 127 | mov dl, bl |
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[275] | 128 | test di, di |
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| 129 | jz SHORT .Return |
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[271] | 130 | mov dl, 80h ; First possible Hard Disk should be safe value |
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[275] | 131 | .Return: |
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[27] | 132 | ret |
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| 133 | |
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[275] | 134 | AH0h_ResetAllOurHardDisksAtTheEndOfDriveInitialization equ ResetHardDisksHandledByOurBIOS.ErrorCodeNotUsed |
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[27] | 135 | |
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| 136 | ;-------------------------------------------------------------------- |
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[271] | 137 | ; ResetHardDisksHandledByOurBIOS |
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| 138 | ; Parameters: |
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| 139 | ; DS:DI: Ptr to DPT for requested drive |
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[294] | 140 | ; If DPT pointer is not available, or error result in BH won't be used anyway, |
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[282] | 141 | ; enter through .ErrorCodeNotUsed. |
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[271] | 142 | ; SS:BP: Ptr to IDEPACK |
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| 143 | ; Returns: |
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[23] | 144 | ; BH: Error code from requested drive (if available) |
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| 145 | ; Corrupts registers: |
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[275] | 146 | ; AX, BX, CX, DX, SI, DI |
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[23] | 147 | ;-------------------------------------------------------------------- |
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[271] | 148 | ResetHardDisksHandledByOurBIOS: |
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[294] | 149 | xor bl, bl ; Assume Null IdevarsOffset for now, assuming foreign drive |
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[282] | 150 | test di, di |
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| 151 | jz .ErrorCodeNotUsed |
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[264] | 152 | mov bl, [di+DPT.bIdevarsOffset] ; replace drive number with Idevars pointer for cmp with dl |
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[294] | 153 | |
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| 154 | .ErrorCodeNotUsed: ; BH will be garbage on exit if this entry point is used, |
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[275] | 155 | ; but reset of all drives will still happen |
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| 156 | |
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[264] | 157 | mov dl, ROMVARS.ideVars0 ; starting Idevars offset |
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| 158 | |
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[316] | 159 | ; Get count of ALL Idevars structures, not just the ones that are configured. This may seem odd, |
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| 160 | ; but it catches the .ideVarsSerialAuto structure, which would not be scanned if the count from |
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| 161 | ; RamVars_GetIdeControllerCountToCX was used. Unused controllers won't make a difference, since no DPT |
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| 162 | ; will point to them. Performance isn't an issue, as this is a reset operation. |
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| 163 | ; |
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| 164 | mov cx, (ROMVARS.ideVarsEnd - ROMVARS.ideVarsBegin) / IDEVARS_size |
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| 165 | |
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[262] | 166 | .loop: |
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[271] | 167 | call FindDPT_ForIdevarsOffsetInDL ; look for the first drive on this controller, if any |
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[262] | 168 | jc .notFound |
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[264] | 169 | |
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[262] | 170 | call AHDh_ResetDrive ; reset master and slave on that controller |
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[264] | 171 | call BackupErrorCodeFromTheRequestedDriveToBH ; save error code if same controller as drive from entry |
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| 172 | |
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[262] | 173 | .notFound: |
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[264] | 174 | add dl, IDEVARS_size ; move Idevars pointer forward |
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| 175 | loop .loop |
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| 176 | |
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| 177 | .done: |
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[259] | 178 | ret |
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