| 1 | ; File name : AHDh_HReset.asm
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| 2 | ; Project name : IDE BIOS
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| 3 | ; Created date : 9.12.2007
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| 4 | ; Last update : 12.4.2010
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| 5 | ; Author : Tomi Tilli
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| 6 | ; Description : Int 13h function AH=Dh, Reset Hard Disk (Alternate reset).
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| 7 |
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| 8 | ; Section containing code
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| 9 | SECTION .text
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| 10 |
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| 11 | ;--------------------------------------------------------------------
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| 12 | ; Int 13h function AH=Dh, Reset Hard Disk (Alternate reset).
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| 13 | ;
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| 14 | ; AHDh_HandlerForResetHardDisk
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| 15 | ; Parameters:
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| 16 | ; AH: Bios function Dh
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| 17 | ; DL: Drive number
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| 18 | ; Returns:
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| 19 | ; AH: Int 13h return status
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| 20 | ; CF: 0 if succesfull, 1 if error
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| 21 | ; IF: 1
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| 22 | ; Corrupts registers:
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| 23 | ; Flags
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| 24 | ;--------------------------------------------------------------------
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| 25 | ALIGN JUMP_ALIGN
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| 26 | AHDh_HandlerForResetHardDisk:
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| 27 | push dx
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| 28 | push cx
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| 29 | push bx
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| 30 | push ax
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| 31 | call AHDh_ResetDrive
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| 32 | jmp Int13h_PopXRegsAndReturn
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| 33 |
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| 34 |
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| 35 | ;--------------------------------------------------------------------
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| 36 | ; Resets hard disk.
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| 37 | ;
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| 38 | ; AHDh_ResetDrive
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| 39 | ; Parameters:
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| 40 | ; DL: Drive number
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| 41 | ; DS: RAMVARS segment
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| 42 | ; Returns:
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| 43 | ; AH: Int 13h return status
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| 44 | ; CF: 0 if succesfull, 1 if error
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| 45 | ; Corrupts registers:
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| 46 | ; AL, BX, CX, DX
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| 47 | ;--------------------------------------------------------------------
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| 48 | ALIGN JUMP_ALIGN
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| 49 | AHDh_ResetDrive:
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| 50 | push di
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| 51 | call FindDPT_ForDriveNumber ; DS:DI now points to DPT
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| 52 | call AHDh_ResetMasterAndSlave
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| 53 | ;jc SHORT .ReturnError ; CF would be set if slave drive present without master
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| 54 | ; (error register has special values after reset)
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| 55 |
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| 56 | ; Initialize Master and Slave drives
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| 57 | mov dx, [RAMVARS.wIdeBase] ; Load base port address
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| 58 | call AHDh_InitializeMasterAndSlave
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| 59 | jc SHORT .ReturnError
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| 60 | xor ax, ax ; Clear AH since success
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| 61 | pop di
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| 62 | ret
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| 63 | .ReturnError:
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| 64 | mov ah, RET_HD_RESETFAIL ; Load Reset Failed error code
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| 65 | pop di
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| 66 | ret
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| 67 |
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| 68 |
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| 69 | ;--------------------------------------------------------------------
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| 70 | ; Resets Master and Slave drives at wanted port.
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| 71 | ; Both IDE drives will be reset. It is not possible to reset
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| 72 | ; Master or Slave only.
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| 73 | ;
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| 74 | ; AHDh_ResetMasterAndSlave
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| 75 | ; Parameters:
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| 76 | ; DS:DI: Ptr to DPT for Master or Slave drive
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| 77 | ; Returns:
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| 78 | ; CF: 0 if reset succesfull
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| 79 | ; 1 if any error
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| 80 | ; Corrupts registers:
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| 81 | ; AX, BX, CX, DX
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| 82 | ;--------------------------------------------------------------------
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| 83 | ALIGN JUMP_ALIGN
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| 84 | AHDh_ResetMasterAndSlave:
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| 85 | ; Reset controller
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| 86 | ; HSR0: Set_SRST
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| 87 | mov al, [di+DPT.bDrvCtrl] ; Load value for ACR
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| 88 | or al, FLG_IDE_CTRL_SRST ; Set Reset bit
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| 89 | call HDrvSel_OutputDeviceControlByte
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| 90 | mov cx, 5 ; Delay at least 5us
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| 91 | call SoftDelay_us
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| 92 |
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| 93 | ; HSR1: Clear_wait
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| 94 | and al, ~FLG_IDE_CTRL_SRST ; Clear Reset bit
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| 95 | out dx, al ; End Reset
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| 96 | mov cx, 2000 ; Delay at least 2ms
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| 97 | call SoftDelay_us
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| 98 |
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| 99 | ; HSR2: Check_status
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| 100 | mov cl, B_TIMEOUT_RESET ; Reset timeout delay
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| 101 | mov dx, [RAMVARS.wIdeBase] ; Load base port address
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| 102 | jmp HStatus_WaitBsyBase
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| 103 |
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| 104 |
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| 105 | ;--------------------------------------------------------------------
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| 106 | ; Initializes Master and Slave drive.
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| 107 | ;
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| 108 | ; AHDh_InitializeMasterAndSlave
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| 109 | ; Parameters:
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| 110 | ; DX: IDE Base Port address
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| 111 | ; Returns:
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| 112 | ; CF: 0 if initialization succesfull
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| 113 | ; 1 if any error
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| 114 | ; Corrupts registers:
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| 115 | ; AX, BX, CX, DX, DI
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| 116 | ;--------------------------------------------------------------------
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| 117 | ALIGN JUMP_ALIGN
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| 118 | AHDh_InitializeMasterAndSlave:
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| 119 | push dx ; Store base port address
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| 120 | xor cx, cx ; Assume no errors
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| 121 | call FindDPT_ForIdeMasterAtPort
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| 122 | jnc SHORT .InitializeSlave ; Master drive not present
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| 123 | call AH9h_InitializeDriveForUse
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| 124 | mov cl, ah ; Copy error code to CL
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| 125 | ALIGN JUMP_ALIGN
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| 126 | .InitializeSlave:
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| 127 | pop dx ; Restore base port address
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| 128 | call FindDPT_ForIdeSlaveAtPort
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| 129 | jnc SHORT .CombineErrors ; Slave drive not present
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| 130 | call AH9h_InitializeDriveForUse
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| 131 | mov ch, ah ; Copy error code to CH
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| 132 | ALIGN JUMP_ALIGN
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| 133 | .CombineErrors:
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| 134 | or cl, ch ; OR error codes, clear CF
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| 135 | jnz SHORT .ReturnError
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| 136 | ret
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| 137 | .ReturnError:
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| 138 | stc
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| 139 | ret
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