[3] | 1 | ; File name : AH0h_HReset.asm
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| 2 | ; Project name : IDE BIOS
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| 3 | ; Created date : 27.9.2007
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[35] | 4 | ; Last update : 24.8.2010
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[3] | 5 | ; Author : Tomi Tilli
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| 6 | ; Description : Int 13h function AH=0h, Disk Controller Reset.
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| 7 |
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| 8 | ; Section containing code
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| 9 | SECTION .text
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| 10 |
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| 11 | ;--------------------------------------------------------------------
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| 12 | ; Int 13h function AH=0h, Disk Controller Reset.
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| 13 | ;
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| 14 | ; AH0h_HandlerForDiskControllerReset
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| 15 | ; Parameters:
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| 16 | ; AH: Bios function 0h
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| 17 | ; DL: Drive number (ignored so all drives are reset)
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| 18 | ; If bit 7 is set all hard disks and floppy disks reset.
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| 19 | ; Parameters loaded by Int13h_Jump:
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| 20 | ; DS: RAMVARS segment
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| 21 | ; Returns:
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[23] | 22 | ; AH: Int 13h return status (from drive requested in DL)
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[3] | 23 | ; CF: 0 if succesfull, 1 if error
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| 24 | ; IF: 1
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| 25 | ; Corrupts registers:
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| 26 | ; Flags
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| 27 | ;--------------------------------------------------------------------
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| 28 | ALIGN JUMP_ALIGN
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| 29 | AH0h_HandlerForDiskControllerReset:
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| 30 | push dx
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| 31 | push cx
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| 32 | push bx
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| 33 | push ax
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| 34 |
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[23] | 35 | eMOVZX bx, dl ; Copy requested drive to BL, zero BH to assume no errors
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[26] | 36 | call ResetFloppyDrivesWithInt40h
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| 37 | test bl, 80h
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| 38 | jz SHORT .SkipHardDiskReset
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| 39 | call ResetForeignHardDisks
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[27] | 40 | call AH0h_ResetHardDisksHandledByOurBIOS
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[23] | 41 | ALIGN JUMP_ALIGN
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[26] | 42 | .SkipHardDiskReset:
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[23] | 43 | mov ah, bh ; Copy error code to AH
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| 44 | xor al, al ; Zero AL...
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[27] | 45 | cmp al, bh ; ...and set CF if error
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[35] | 46 | jmp Int13h_PopXRegsAndReturn
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[3] | 47 |
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| 48 |
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| 49 | ;--------------------------------------------------------------------
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[26] | 50 | ; ResetFloppyDrivesWithInt40h
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[3] | 51 | ; Parameters:
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[23] | 52 | ; BL: Requested drive (DL when entering AH=00h)
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| 53 | ; Returns:
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| 54 | ; BH: Error code from requested drive (if available)
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| 55 | ; Corrupts registers:
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[27] | 56 | ; AX, DL, DI
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[23] | 57 | ;--------------------------------------------------------------------
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| 58 | ALIGN JUMP_ALIGN
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[26] | 59 | ResetFloppyDrivesWithInt40h:
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[27] | 60 | call GetDriveNumberForForeignBiosesToDL
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| 61 | and dl, 7Fh ; Clear hard disk bit
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[26] | 62 | xor ah, ah ; Disk Controller Reset
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[23] | 63 | int INTV_FLOPPY_FUNC
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[26] | 64 | jmp SHORT BackupErrorCodeFromTheRequestedDriveToBH
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[23] | 65 |
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| 66 |
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| 67 | ;--------------------------------------------------------------------
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[26] | 68 | ; ResetForeignHardDisks
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[23] | 69 | ; Parameters:
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| 70 | ; BL: Requested drive (DL when entering AH=00h)
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[3] | 71 | ; DS: RAMVARS segment
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| 72 | ; Returns:
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[23] | 73 | ; BH: Error code from requested drive (if available)
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[3] | 74 | ; Corrupts registers:
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[27] | 75 | ; AX, DL, DI
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[23] | 76 | ;--------------------------------------------------------------------
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| 77 | ALIGN JUMP_ALIGN
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[26] | 78 | ResetForeignHardDisks:
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[27] | 79 | call GetDriveNumberForForeignBiosesToDL
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| 80 | xor ah, ah ; Disk Controller Reset
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[32] | 81 | call Int13h_CallPreviousInt13hHandler
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[26] | 82 | jmp SHORT BackupErrorCodeFromTheRequestedDriveToBH
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[23] | 83 |
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[26] | 84 |
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[3] | 85 | ;--------------------------------------------------------------------
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[27] | 86 | ; GetDriveNumberForForeignBiosesToDL
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| 87 | ; Parameters:
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| 88 | ; BL: Requested drive (DL when entering AH=00h)
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| 89 | ; DS: RAMVARS segment
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| 90 | ; Returns:
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| 91 | ; DL: BL if foreign drive
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| 92 | ; 80h if our drive
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| 93 | ; Corrupts registers:
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| 94 | ; DI
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| 95 | ;--------------------------------------------------------------------
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| 96 | ALIGN JUMP_ALIGN
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| 97 | GetDriveNumberForForeignBiosesToDL:
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| 98 | mov dl, bl
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| 99 | call RamVars_IsDriveHandledByThisBIOS
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| 100 | jc SHORT .GetFirstDriveForForeignBios
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| 101 | ret ; Return what was in BL unmodified
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| 102 | ALIGN JUMP_ALIGN
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| 103 | .GetFirstDriveForForeignBios:
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| 104 | mov dl, 80h
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| 105 | ret
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| 106 |
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| 107 |
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| 108 | ;--------------------------------------------------------------------
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[26] | 109 | ; ResetHardDisksHandledByOurBIOS
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[23] | 110 | ; Parameters:
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| 111 | ; BL: Requested drive (DL when entering AH=00h)
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| 112 | ; DS: RAMVARS segment
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| 113 | ; Returns:
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| 114 | ; BH: Error code from requested drive (if available)
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| 115 | ; Corrupts registers:
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[27] | 116 | ; AX, CX, DX, DI
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[23] | 117 | ;--------------------------------------------------------------------
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[3] | 118 | ALIGN JUMP_ALIGN
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[27] | 119 | AH0h_ResetHardDisksHandledByOurBIOS:
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[26] | 120 | mov dh, [RAMVARS.bDrvCnt] ; Load drive count to DH
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| 121 | test dh, dh
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| 122 | jz SHORT .AllDrivesReset ; Return if no drives
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| 123 | mov dl, [RAMVARS.bFirstDrv] ; Load number of first our drive
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| 124 | add dh, dl ; DH = one past last drive to reset
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[3] | 125 | ALIGN JUMP_ALIGN
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[26] | 126 | .DriveResetLoop:
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| 127 | call AHDh_ResetDrive
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[27] | 128 | call .BackupErrorCodeFromMasterOrSlaveToBH
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[26] | 129 | inc dx
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| 130 | cmp dl, dh ; All done?
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| 131 | jb SHORT .DriveResetLoop ; If not, reset next drive
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| 132 | .AllDrivesReset:
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[3] | 133 | ret
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| 134 |
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| 135 | ;--------------------------------------------------------------------
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[27] | 136 | ; .BackupErrorCodeFromMasterOrSlaveToBH
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[3] | 137 | ; Parameters:
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[27] | 138 | ; AH: Error code for drive DL reset
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| 139 | ; BL: Requested drive (DL when entering AH=00h)
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[26] | 140 | ; DL: Drive just resetted
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[3] | 141 | ; DS: RAMVARS segment
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| 142 | ; Returns:
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[27] | 143 | ; BH: Backuped error code
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[26] | 144 | ; DL: Incremented if next drive is slave drive
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| 145 | ; (=already resetted)
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[3] | 146 | ; Corrupts registers:
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[27] | 147 | ; CX, DI
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[3] | 148 | ;--------------------------------------------------------------------
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| 149 | ALIGN JUMP_ALIGN
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[27] | 150 | .BackupErrorCodeFromMasterOrSlaveToBH:
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| 151 | call BackupErrorCodeFromTheRequestedDriveToBH
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| 152 | mov cx, [RAMVARS.wIdeBase] ; Load base port for resetted drive
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[26] | 153 |
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[27] | 154 | inc dx ; DL to next drive
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| 155 | call FindDPT_ForDriveNumber ; Get DPT to DS:DI, store port to RAMVARS
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| 156 | jnc SHORT .NoMoreDrivesOrNoSlaveDrive
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| 157 | cmp cx, [RAMVARS.wIdeBase] ; Next drive is from same controller?
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| 158 | je SHORT BackupErrorCodeFromTheRequestedDriveToBH
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| 159 | .NoMoreDrivesOrNoSlaveDrive:
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| 160 | dec dx
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[3] | 161 | ret
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| 162 |
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| 163 |
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| 164 | ;--------------------------------------------------------------------
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[26] | 165 | ; BackupErrorCodeFromTheRequestedDriveToBH
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[3] | 166 | ; Parameters:
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[23] | 167 | ; AH: Error code from the last resetted drive
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| 168 | ; DL: Drive last resetted
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| 169 | ; BL: Requested drive (DL when entering AH=00h)
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[3] | 170 | ; Returns:
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[23] | 171 | ; BH: Backuped error code
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[3] | 172 | ; Corrupts registers:
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| 173 | ; Nothing
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| 174 | ;--------------------------------------------------------------------
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| 175 | ALIGN JUMP_ALIGN
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[26] | 176 | BackupErrorCodeFromTheRequestedDriveToBH:
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| 177 | cmp dl, bl ; Requested drive?
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[23] | 178 | jne SHORT .Return
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| 179 | mov bh, ah
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| 180 | ALIGN JUMP_ALIGN
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| 181 | .Return:
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[3] | 182 | ret
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