[3] | 1 | ; File name : AH0h_HReset.asm |
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| 2 | ; Project name : IDE BIOS |
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| 3 | ; Created date : 27.9.2007 |
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| 4 | ; Last update : 2.5.2010 |
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| 5 | ; Author : Tomi Tilli |
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| 6 | ; Description : Int 13h function AH=0h, Disk Controller Reset. |
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| 7 | |
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| 8 | RETRIES_IF_RESET_FAILS EQU 3 |
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| 9 | TIMEOUT_BEFORE_RESET_RETRY EQU 5 ; System timer ticks |
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| 10 | |
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| 11 | ; Section containing code |
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| 12 | SECTION .text |
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| 13 | |
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| 14 | ;-------------------------------------------------------------------- |
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| 15 | ; Int 13h function AH=0h, Disk Controller Reset. |
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| 16 | ; |
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| 17 | ; AH0h_HandlerForDiskControllerReset |
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| 18 | ; Parameters: |
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| 19 | ; AH: Bios function 0h |
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| 20 | ; DL: Drive number (ignored so all drives are reset) |
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| 21 | ; If bit 7 is set all hard disks and floppy disks reset. |
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| 22 | ; Parameters loaded by Int13h_Jump: |
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| 23 | ; DS: RAMVARS segment |
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| 24 | ; Returns: |
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| 25 | ; AH: Int 13h return status |
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| 26 | ; CF: 0 if succesfull, 1 if error |
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| 27 | ; IF: 1 |
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| 28 | ; Corrupts registers: |
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| 29 | ; Flags |
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| 30 | ;-------------------------------------------------------------------- |
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| 31 | ALIGN JUMP_ALIGN |
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| 32 | AH0h_HandlerForDiskControllerReset: |
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| 33 | push dx |
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| 34 | push cx |
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| 35 | push bx |
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| 36 | push ax |
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| 37 | |
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| 38 | test dl, 80h ; Reset floppy drives only? |
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| 39 | jz SHORT .ResetForeignControllers |
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| 40 | call AH0h_ResetOurControllers |
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| 41 | .ResetForeignControllers: |
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| 42 | call AH0h_ResetFloppyAndForeignHardDiskControllers |
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| 43 | jmp Int13h_PopXRegsAndReturn ; Return since error |
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| 44 | |
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| 45 | |
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| 46 | ;-------------------------------------------------------------------- |
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| 47 | ; Resets all IDE controllers handled by this BIOS. |
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| 48 | ; |
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| 49 | ; AH0h_ResetOurControllers |
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| 50 | ; Parameters: |
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| 51 | ; DS: RAMVARS segment |
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| 52 | ; Returns: |
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| 53 | ; AH: Int 13h return status |
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| 54 | ; CF: 0 if succesfull, 1 if error |
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| 55 | ; Corrupts registers: |
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| 56 | ; AL, BX, CX, DI |
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| 57 | ;-------------------------------------------------------------------- |
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| 58 | ALIGN JUMP_ALIGN |
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| 59 | AH0h_ResetOurControllers: |
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| 60 | push dx |
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| 61 | mov bx, ROMVARS.ideVars0 ; Load offset to first IDEVARS |
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| 62 | call Initialize_GetIdeControllerCountToCX |
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| 63 | ALIGN JUMP_ALIGN |
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| 64 | .ResetLoop: |
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| 65 | call AH0h_ResetIdevarsController |
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| 66 | jc SHORT .Return |
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| 67 | add bx, BYTE IDEVARS_size |
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| 68 | loop .ResetLoop |
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| 69 | xor ax, ax ; Clear AH and CF since no errors |
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| 70 | .Return: |
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| 71 | pop dx |
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| 72 | ret |
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| 73 | |
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| 74 | |
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| 75 | ;-------------------------------------------------------------------- |
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| 76 | ; Resets master and slave drive based on either drive number. |
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| 77 | ; |
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| 78 | ; AH0h_ResetIdevarsController |
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| 79 | ; Parameters: |
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| 80 | ; CS:BX: Ptr to IDEVARS |
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| 81 | ; DS: RAMVARS segment |
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| 82 | ; Returns: |
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| 83 | ; AH: Int 13h return status |
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| 84 | ; CF: 0 if succesfull, 1 if error |
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| 85 | ; Corrupts registers: |
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| 86 | ; AL, DX, DI |
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| 87 | ;-------------------------------------------------------------------- |
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| 88 | ALIGN JUMP_ALIGN |
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| 89 | AH0h_ResetIdevarsController: |
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| 90 | mov dx, [cs:bx+IDEVARS.wPort] |
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| 91 | call FindDPT_ForIdeMasterAtPort ; Find master drive to DL |
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| 92 | jc SHORT AH0h_ResetMasterAndSlaveDriveWithRetries |
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| 93 | call FindDPT_ForIdeSlaveAtPort ; Find slave if master not present |
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| 94 | jc SHORT AH0h_ResetMasterAndSlaveDriveWithRetries |
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| 95 | clc |
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| 96 | ret |
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| 97 | |
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| 98 | |
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| 99 | ;-------------------------------------------------------------------- |
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| 100 | ; Resets master and slave drive based on either drive number. |
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| 101 | ; |
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| 102 | ; AH0h_ResetMasterAndSlaveDriveWithRetries |
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| 103 | ; Parameters: |
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| 104 | ; DL: Drive number for master or slave drive |
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| 105 | ; Returns: |
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| 106 | ; AH: Int 13h return status |
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| 107 | ; CF: 0 if succesfull, 1 if error |
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| 108 | ; Corrupts registers: |
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| 109 | ; AL, DX, DI |
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| 110 | ;-------------------------------------------------------------------- |
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| 111 | ALIGN JUMP_ALIGN |
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| 112 | AH0h_ResetMasterAndSlaveDriveWithRetries: |
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| 113 | push cx |
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| 114 | push bx |
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| 115 | mov cx, RETRIES_IF_RESET_FAILS |
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| 116 | ALIGN JUMP_ALIGN |
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| 117 | .RetryLoop: |
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| 118 | mov di, cx ; Backup counter |
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| 119 | call AHDh_ResetDrive |
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| 120 | jnc SHORT .Return |
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| 121 | mov cx, TIMEOUT_BEFORE_RESET_RETRY |
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| 122 | call SoftDelay_TimerTicks |
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| 123 | mov cx, di |
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| 124 | loop .RetryLoop |
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| 125 | mov ah, RET_HD_RESETFAIL |
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| 126 | stc |
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| 127 | ALIGN JUMP_ALIGN |
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| 128 | .Return: |
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| 129 | pop bx |
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| 130 | pop cx |
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| 131 | ret |
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| 132 | |
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| 133 | |
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| 134 | ;-------------------------------------------------------------------- |
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| 135 | ; Resets floppy drives and foreign hard disks. |
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| 136 | ; |
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| 137 | ; AH0h_ResetFloppyAndForeignHardDiskControllers |
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| 138 | ; Parameters: |
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| 139 | ; DL: Drive number (ignored so all drives are reset) |
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| 140 | ; If bit 7 is set all hard disks and floppy disks reset. |
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| 141 | ; Returns: |
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| 142 | ; AH: Int 13h return status |
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| 143 | ; CF: 0 if succesfull, 1 if error |
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| 144 | ; Corrupts registers: |
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| 145 | ; Nothing |
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| 146 | ;-------------------------------------------------------------------- |
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| 147 | ALIGN JUMP_ALIGN |
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| 148 | AH0h_ResetFloppyAndForeignHardDiskControllers: |
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| 149 | xor ah, ah ; AH=0h, Disk Controller Reset |
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| 150 | pushf ; Push flags to simulate INT |
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| 151 | cli ; Disable interrupts |
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| 152 | call FAR [RAMVARS.fpOldI13h] |
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| 153 | ret |
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