| 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 successful, 1 if error
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| 18 | ;--------------------------------------------------------------------
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| 19 | AHDh_HandlerForResetHardDisk:
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| 20 | %ifndef USE_186
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| 21 | call AHDh_ResetDrive
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| 22 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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| 23 | %else
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| 24 | push Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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| 25 | ; Fall to AHDh_ResetDrive
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| 26 | %endif
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| 27 |
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| 28 |
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| 29 | ;--------------------------------------------------------------------
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| 30 | ; Resets hard disk.
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| 31 | ;
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| 32 | ; AHDh_ResetDrive
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| 33 | ; Parameters:
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| 34 | ; DS:DI: Ptr to DPT
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| 35 | ; SS:BP: Ptr to IDEPACK
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| 36 | ; Returns:
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| 37 | ; AH: Int 13h return status
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| 38 | ; CF: 0 if successful, 1 if error
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| 39 | ; Corrupts registers:
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| 40 | ; AL, SI
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| 41 | ;--------------------------------------------------------------------
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| 42 | AHDh_ResetDrive:
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| 43 | push dx
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| 44 | push cx
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| 45 | push bx
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| 46 | push di
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| 47 |
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| 48 | call Interrupts_UnmaskInterruptControllerForDriveInDSDI
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| 49 | call Device_ResetMasterAndSlaveController
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| 50 | ;jc SHORT .ReturnError ; CF would be set if slave drive present without master
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| 51 | ; (error register has special values after reset)
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| 52 |
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| 53 | ; Initialize Master and Slave drives
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| 54 | eMOVZX ax, [di+DPT.bIdevarsOffset] ; (AL) pointer to controller we are looking to reset
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| 55 | ; (AH) initialize error code, assume success
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| 56 |
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| 57 | mov si, IterateAndResetDrives ; Callback function for FindDPT_IterateAllDPTs
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| 58 | call FindDPT_IterateAllDPTs
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| 59 |
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| 60 | shr ah, 1 ; Move error code and CF into proper position
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| 61 |
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| 62 | pop di
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| 63 | pop bx
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| 64 | pop cx
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| 65 | pop dx
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| 66 | ret
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| 67 |
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| 68 | ;--------------------------------------------------------------------
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| 69 | ; IterateAndResetDrives: Iteration routine for use with IterateAllDPTs.
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| 70 | ;
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| 71 | ; When a drive on the controller is found, it is reset, and the error code
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| 72 | ; merged into overall error code for this controller. Master will be reset
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| 73 | ; first. Note that the iteration will go until the end of the DPT list.
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| 74 | ;
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| 75 | ; Parameters:
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| 76 | ; AL: Offset to IDEVARS for drives to initialize
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| 77 | ; AH: Error status from previous initialization
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| 78 | ; DS:DI: Ptr to DPT to examine
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| 79 | ; Returns:
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| 80 | ; AH: Error status from initialization
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| 81 | ; CF: Set to iterate all DPTs
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| 82 | ; Corrupts registers:
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| 83 | ; AL, BX, DX
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| 84 | ;--------------------------------------------------------------------
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| 85 | IterateAndResetDrives:
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| 86 | cmp al, [di+DPT.bIdevarsOffset] ; The right controller?
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| 87 | jne .Done
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| 88 | push cx
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| 89 | push ax
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| 90 | call AH9h_InitializeDriveForUse ; Reset Master and Slave (Master will come first in DPT list)
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| 91 |
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| 92 | %ifdef MODULE_ADVANCED_ATA
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| 93 | jc SHORT .SkipControllerInitSinceError
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| 94 | ; Here we initialize the more advanced controllers (VLB and PCI) to get better performance for systems with 32-bit bus.
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| 95 | ; This step is optional since the controllers use slowest possible settings by default if they are not initialized.
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| 96 |
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| 97 | pop ax
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| 98 | push ax
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| 99 | cmp al, [di+LARGEST_DPT_SIZE+DPT.bIdevarsOffset] ; We check if next DPT is for the same IDE controller.
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| 100 | je SHORT .SkipInitializationUntilNextDrive ; If it is, we skip the initialization.
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| 101 | call AdvAtaInit_InitializeControllerForDPTinDSDI ; Done after drive init so drives are first set to advanced PIO mode, then the controller
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| 102 | .SkipInitializationUntilNextDrive:
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| 103 | .SkipControllerInitSinceError:
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| 104 | %endif ; MODULE_ADVANCED_ATA
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| 105 |
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| 106 | pop ax
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| 107 | pop cx
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| 108 | jnc .Done
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| 109 | or ah, (RET_HD_RESETFAIL << 1) | 1 ; OR in Reset Failed error code and CF, will SHR into position later
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| 110 | .Done:
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| 111 | stc ; From IterateAllDPTs perspective, the DPT is never found (continue iteration)
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| 112 | ret
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| 113 |
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