[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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| 10 | ; AH0h_HandlerForDiskControllerReset
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| 11 | ; Parameters:
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[148] | 12 | ; DL: Translated Drive number (ignored so all drives are reset)
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[3] | 13 | ; If bit 7 is set all hard disks and floppy disks reset.
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[148] | 14 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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[150] | 15 | ; SS:BP: Ptr to IDEPACK
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| 16 | ; Returns with INTPACK:
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[23] | 17 | ; AH: Int 13h return status (from drive requested in DL)
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[3] | 18 | ; CF: 0 if succesfull, 1 if error
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| 19 | ;--------------------------------------------------------------------
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| 20 | ALIGN JUMP_ALIGN
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| 21 | AH0h_HandlerForDiskControllerReset:
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[23] | 22 | eMOVZX bx, dl ; Copy requested drive to BL, zero BH to assume no errors
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[26] | 23 | call ResetFloppyDrivesWithInt40h
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[128] | 24 | test bl, bl
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| 25 | jns SHORT .SkipHardDiskReset
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[26] | 26 | call ResetForeignHardDisks
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[27] | 27 | call AH0h_ResetHardDisksHandledByOurBIOS
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[26] | 28 | .SkipHardDiskReset:
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[148] | 29 | mov ah, bh
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| 30 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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[3] | 31 |
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| 32 |
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| 33 | ;--------------------------------------------------------------------
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[26] | 34 | ; ResetFloppyDrivesWithInt40h
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[3] | 35 | ; Parameters:
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[23] | 36 | ; BL: Requested drive (DL when entering AH=00h)
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| 37 | ; Returns:
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| 38 | ; BH: Error code from requested drive (if available)
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| 39 | ; Corrupts registers:
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[27] | 40 | ; AX, DL, DI
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[128] | 41 | ;--------------------------------------------------------------------
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[23] | 42 | ALIGN JUMP_ALIGN
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[26] | 43 | ResetFloppyDrivesWithInt40h:
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[27] | 44 | call GetDriveNumberForForeignBiosesToDL
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| 45 | and dl, 7Fh ; Clear hard disk bit
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[26] | 46 | xor ah, ah ; Disk Controller Reset
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[148] | 47 | int BIOS_DISKETTE_INTERRUPT_40h
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[26] | 48 | jmp SHORT BackupErrorCodeFromTheRequestedDriveToBH
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[23] | 49 |
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| 50 |
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| 51 | ;--------------------------------------------------------------------
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[26] | 52 | ; ResetForeignHardDisks
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[23] | 53 | ; Parameters:
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| 54 | ; BL: Requested drive (DL when entering AH=00h)
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[3] | 55 | ; DS: RAMVARS segment
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| 56 | ; Returns:
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[23] | 57 | ; BH: Error code from requested drive (if available)
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[3] | 58 | ; Corrupts registers:
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[27] | 59 | ; AX, DL, DI
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[128] | 60 | ;--------------------------------------------------------------------
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[23] | 61 | ALIGN JUMP_ALIGN
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[26] | 62 | ResetForeignHardDisks:
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[27] | 63 | call GetDriveNumberForForeignBiosesToDL
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| 64 | xor ah, ah ; Disk Controller Reset
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[32] | 65 | call Int13h_CallPreviousInt13hHandler
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[26] | 66 | jmp SHORT BackupErrorCodeFromTheRequestedDriveToBH
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[23] | 67 |
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[26] | 68 |
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[3] | 69 | ;--------------------------------------------------------------------
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[27] | 70 | ; GetDriveNumberForForeignBiosesToDL
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| 71 | ; Parameters:
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| 72 | ; BL: Requested drive (DL when entering AH=00h)
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| 73 | ; DS: RAMVARS segment
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| 74 | ; Returns:
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| 75 | ; DL: BL if foreign drive
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| 76 | ; 80h if our drive
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| 77 | ; Corrupts registers:
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| 78 | ; DI
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[128] | 79 | ;--------------------------------------------------------------------
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[27] | 80 | ALIGN JUMP_ALIGN
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| 81 | GetDriveNumberForForeignBiosesToDL:
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| 82 | mov dl, bl
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| 83 | call RamVars_IsDriveHandledByThisBIOS
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[84] | 84 | jnc SHORT .Return ; Return what was in BL unmodified
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| 85 | mov dl, 80h
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| 86 | .Return:
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[27] | 87 | ret
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| 88 |
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| 89 |
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| 90 | ;--------------------------------------------------------------------
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[150] | 91 | ; AH0h_ResetHardDisksHandledByOurBIOS
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[23] | 92 | ; Parameters:
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| 93 | ; BL: Requested drive (DL when entering AH=00h)
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| 94 | ; DS: RAMVARS segment
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[150] | 95 | ; SS:BP: Ptr to IDEPACK
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[23] | 96 | ; Returns:
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| 97 | ; BH: Error code from requested drive (if available)
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| 98 | ; Corrupts registers:
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[150] | 99 | ; AX, CX, DX, SI, DI
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[23] | 100 | ;--------------------------------------------------------------------
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[3] | 101 | ALIGN JUMP_ALIGN
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[27] | 102 | AH0h_ResetHardDisksHandledByOurBIOS:
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[26] | 103 | mov dh, [RAMVARS.bDrvCnt] ; Load drive count to DH
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| 104 | test dh, dh
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| 105 | jz SHORT .AllDrivesReset ; Return if no drives
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[150] | 106 | mov dl, [RAMVARS.bFirstDrv] ; Load number of our first drive
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[26] | 107 | add dh, dl ; DH = one past last drive to reset
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[3] | 108 | ALIGN JUMP_ALIGN
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[26] | 109 | .DriveResetLoop:
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| 110 | call AHDh_ResetDrive
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[27] | 111 | call .BackupErrorCodeFromMasterOrSlaveToBH
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[26] | 112 | inc dx
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| 113 | cmp dl, dh ; All done?
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| 114 | jb SHORT .DriveResetLoop ; If not, reset next drive
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| 115 | .AllDrivesReset:
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[3] | 116 | ret
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| 117 |
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| 118 | ;--------------------------------------------------------------------
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[27] | 119 | ; .BackupErrorCodeFromMasterOrSlaveToBH
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[3] | 120 | ; Parameters:
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[27] | 121 | ; AH: Error code for drive DL reset
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| 122 | ; BL: Requested drive (DL when entering AH=00h)
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[26] | 123 | ; DL: Drive just resetted
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[3] | 124 | ; DS: RAMVARS segment
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| 125 | ; Returns:
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[27] | 126 | ; BH: Backuped error code
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[26] | 127 | ; DL: Incremented if next drive is slave drive
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| 128 | ; (=already resetted)
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[3] | 129 | ; Corrupts registers:
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[27] | 130 | ; CX, DI
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[3] | 131 | ;--------------------------------------------------------------------
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| 132 | ALIGN JUMP_ALIGN
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[27] | 133 | .BackupErrorCodeFromMasterOrSlaveToBH:
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| 134 | call BackupErrorCodeFromTheRequestedDriveToBH
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[150] | 135 | call GetBasePortToCX ; Load base port for resetted drive
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| 136 | push cx
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[27] | 137 | inc dx ; DL to next drive
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[150] | 138 | call GetBasePortToCX
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| 139 | pop di
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| 140 | cmp cx, di ; Next drive is from same controller?
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[27] | 141 | je SHORT BackupErrorCodeFromTheRequestedDriveToBH
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| 142 | .NoMoreDrivesOrNoSlaveDrive:
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| 143 | dec dx
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[3] | 144 | ret
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| 145 |
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[150] | 146 | ;--------------------------------------------------------------------
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| 147 | ; GetBasePortToCX
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| 148 | ; Parameters:
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| 149 | ; DL: Drive number
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| 150 | ; DS: RAMVARS segment
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| 151 | ; Returns:
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| 152 | ; CX: Base port address
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| 153 | ; CF: Set if valid drive number
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| 154 | ; Cleared if invalid drive number
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| 155 | ; Corrupts registers:
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| 156 | ; DI
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| 157 | ;--------------------------------------------------------------------
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| 158 | ALIGN JUMP_ALIGN
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| 159 | GetBasePortToCX:
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| 160 | xchg cx, bx
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| 161 | xor bx, bx
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| 162 | call FindDPT_ForDriveNumber
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| 163 | mov bl, [di+DPT.bIdevarsOffset]
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| 164 | mov bx, [cs:bx+IDEVARS.wPort]
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| 165 | xchg bx, cx
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| 166 | ret
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[3] | 167 |
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[150] | 168 |
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[3] | 169 | ;--------------------------------------------------------------------
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[26] | 170 | ; BackupErrorCodeFromTheRequestedDriveToBH
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[3] | 171 | ; Parameters:
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[23] | 172 | ; AH: Error code from the last resetted drive
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| 173 | ; DL: Drive last resetted
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| 174 | ; BL: Requested drive (DL when entering AH=00h)
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[3] | 175 | ; Returns:
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[23] | 176 | ; BH: Backuped error code
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[3] | 177 | ; Corrupts registers:
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| 178 | ; Nothing
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| 179 | ;--------------------------------------------------------------------
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| 180 | ALIGN JUMP_ALIGN
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[26] | 181 | BackupErrorCodeFromTheRequestedDriveToBH:
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| 182 | cmp dl, bl ; Requested drive?
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[148] | 183 | eCMOVE bh, ah
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[3] | 184 | ret
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