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