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