| 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 | ; DS:DI: Ptr to DPT |
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| 36 | ; SS:BP: Ptr to IDEPACK |
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| 37 | ; Returns: |
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| 38 | ; AH: Int 13h return status |
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| 39 | ; CF: 0 if succesfull, 1 if error |
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| 40 | ; Corrupts registers: |
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| 41 | ; AL, SI |
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| 42 | ;-------------------------------------------------------------------- |
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| 43 | AHDh_ResetDrive: |
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| 44 | push dx |
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| 45 | push cx |
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| 46 | push bx |
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| 47 | push di |
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| 48 | |
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| 49 | call Interrupts_UnmaskInterruptControllerForDriveInDSDI |
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| 50 | call Device_ResetMasterAndSlaveController |
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| 51 | ;jc SHORT .ReturnError ; CF would be set if slave drive present without master |
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| 52 | ; (error register has special values after reset) |
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| 53 | |
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| 54 | ; Initialize Master and Slave drives |
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| 55 | mov al, [di+DPT.bIdevarsOffset] ; pointer to controller we are looking to reset |
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| 56 | mov ah, 0 ; initialize error code, assume success |
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| 57 | |
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| 58 | mov si, IterateAndResetDrives |
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| 59 | call FindDPT_IterateAllDPTs |
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| 60 | |
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| 61 | shr ah, 1 ; Move error code and CF into proper position |
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| 62 | |
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| 63 | pop di |
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| 64 | pop bx |
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| 65 | pop cx |
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| 66 | pop dx |
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| 67 | ret |
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| 68 | |
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| 69 | ;-------------------------------------------------------------------- |
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| 70 | ; IterateAndResetDrives: Iteration routine for use with IterateAllDPTs. |
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| 71 | ; |
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| 72 | ; When a drive on the controller is found, it is reset, and the error code |
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| 73 | ; merged into overall error code for this controller. Master will be reset |
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| 74 | ; first. Note that the iteration will go until the end of the DPT list. |
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| 75 | ;-------------------------------------------------------------------- |
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| 76 | IterateAndResetDrives: |
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| 77 | cmp al, [di+DPT.bIdevarsOffset] ; The right controller? |
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| 78 | jne .done |
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| 79 | push ax |
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| 80 | call AH9h_InitializeDriveForUse ; Reset Master and Slave (Master will come first in DPT list) |
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| 81 | pop ax |
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| 82 | jc .done |
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| 83 | or ah, (RET_HD_RESETFAIL << 1) | 1 ; OR in Reset Failed error code and CF, will SHR into position later |
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| 84 | .done: |
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| 85 | stc ; From IterateAllDPTs perspective, the DPT is never found (continue iteration) |
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| 86 | ret |
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