| 1 | ; Project name : XTIDE Universal BIOS
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| 2 | ; Description : Int 13h function AH=Dh, Reset Hard Disk (Alternate 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=Dh, Reset Hard Disk (Alternate reset).
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| 9 | ;
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| 10 | ; AHDh_HandlerForResetHardDisk
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| 11 | ; Parameters:
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| 12 | ; DL: Translated Drive number
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| 13 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 14 | ; SS:BP: Ptr to IDEPACK
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| 15 | ; Returns with INTPACK:
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| 16 | ; AH: Int 13h return status
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| 17 | ; CF: 0 if succesfull, 1 if error
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| 18 | ;--------------------------------------------------------------------
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| 19 | ALIGN JUMP_ALIGN
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| 20 | AHDh_HandlerForResetHardDisk:
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| 21 | %ifndef USE_186
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| 22 | call AHDh_ResetDrive
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| 23 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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| 24 | %else
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| 25 | push Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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| 26 | ; Fall to AHDh_ResetDrive
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| 27 | %endif
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| 28 |
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| 29 |
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| 30 | ;--------------------------------------------------------------------
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| 31 | ; Resets hard disk.
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| 32 | ;
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| 33 | ; AHDh_ResetDrive
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| 34 | ; Parameters:
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| 35 | ; DL: Drive number
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| 36 | ; DS: RAMVARS segment
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| 37 | ; SS:BP: Ptr to IDEPACK
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| 38 | ; Returns:
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| 39 | ; AH: Int 13h return status
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| 40 | ; CF: 0 if succesfull, 1 if error
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| 41 | ; Corrupts registers:
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| 42 | ; AL, CX, SI, DI
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| 43 | ;--------------------------------------------------------------------
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| 44 | ;ALIGN JUMP_ALIGN
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| 45 | AHDh_ResetDrive:
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| 46 | push dx
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| 47 | push bx
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| 48 |
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| 49 | call FindDPT_ForDriveNumber ; DS:DI now points to DPT
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| 50 | call Interrupts_UnmaskInterruptControllerForDriveInDSDI
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| 51 | call Device_ResetMasterAndSlaveController
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| 52 | ;jc SHORT .ReturnError ; CF would be set if slave drive present without master
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| 53 | ; (error register has special values after reset)
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| 54 |
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| 55 | ; Initialize Master and Slave drives
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| 56 | eMOVZX bx, BYTE [di+DPT.bIdevarsOffset]
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| 57 | mov dx, [cs:bx+IDEVARS.wPort]
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| 58 | call InitializeMasterAndSlaveDriveFromPortInDX
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| 59 |
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| 60 | pop bx
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| 61 | pop dx
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| 62 | ret
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| 63 |
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| 64 |
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| 65 | ;--------------------------------------------------------------------
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| 66 | ; InitializeMasterAndSlaveDriveFromPortInDX
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| 67 | ; Parameters:
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| 68 | ; DX: IDE Base Port address
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| 69 | ; SS:BP: Ptr to IDEPACK
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| 70 | ; Returns:
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| 71 | ; AH: Error code
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| 72 | ; CF: 0 if initialization succesfull
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| 73 | ; 1 if any error
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| 74 | ; Corrupts registers:
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| 75 | ; AL, BX, CX, DX, SI, DI
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| 76 | ;--------------------------------------------------------------------
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| 77 | ALIGN JUMP_ALIGN
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| 78 | InitializeMasterAndSlaveDriveFromPortInDX:
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| 79 | push dx ; Store base port address
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| 80 | xor cx, cx ; Assume no errors
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| 81 | call FindDPT_ToDSDIForIdeMasterAtPortDX
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| 82 | jnc SHORT .InitializeSlave ; Master drive not present
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| 83 | call AH9h_InitializeDriveForUse
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| 84 | mov cl, ah ; Copy error code to CL
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| 85 | .InitializeSlave:
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| 86 | pop dx ; Restore base port address
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| 87 | call FindDPT_ToDSDIForIdeSlaveAtPortDX
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| 88 | jnc SHORT .CombineErrors ; Slave drive not present
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| 89 | call AH9h_InitializeDriveForUse
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| 90 | mov ch, ah ; Copy error code to CH
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| 91 | .CombineErrors:
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| 92 | or cl, ch ; OR error codes, clear CF
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| 93 | jz SHORT .Return
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| 94 | mov ah, RET_HD_RESETFAIL ; Load Reset Failed error code
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| 95 | stc
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| 96 | .Return:
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| 97 | ret
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