| 1 | ; File name : HError.asm
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| 2 | ; Project name : IDE BIOS
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| 3 | ; Created date : 30.11.2007
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| 4 | ; Last update : 24.8.2010
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| 5 | ; Author : Tomi Tilli
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| 6 | ; Description : Error checking functions for BIOS Hard disk functions.
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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 | ; HError_ProcessTimeoutAfterPollingBSYandSomeOtherStatusBit
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| 13 | ; HError_ProcessErrorsAfterPollingBSY
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| 14 | ; Parameters:
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| 15 | ; DS: RAMVARS segment
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| 16 | ; Returns:
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| 17 | ; AH: BIOS error code
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| 18 | ; CF: Set if error
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| 19 | ; Cleared if no error
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| 20 | ; Corrupts registers:
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| 21 | ; AL
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| 22 | ;--------------------------------------------------------------------
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| 23 | ALIGN JUMP_ALIGN
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| 24 | HError_ProcessTimeoutAfterPollingBSYandSomeOtherStatusBit:
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| 25 | call HError_GetStatusAndErrorRegistersToAXandStoreThemToBDA
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| 26 | call GetBiosErrorCodeToAHfromStatusAndErrorRegistersInAX
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| 27 | jc SHORT .ReturnErrorCodeInAH
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| 28 | mov ah, RET_HD_TIMEOUT ; Force timeout since no actual error...
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| 29 | stc ; ...but wanted bit was never set
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| 30 | .ReturnErrorCodeInAH:
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| 31 | ret
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| 32 |
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| 33 |
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| 34 | ALIGN JUMP_ALIGN
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| 35 | HError_ProcessErrorsAfterPollingBSY:
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| 36 | call HError_GetStatusAndErrorRegistersToAXandStoreThemToBDA
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| 37 | jmp SHORT GetBiosErrorCodeToAHfromStatusAndErrorRegistersInAX
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| 38 |
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| 39 |
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| 40 | ;--------------------------------------------------------------------
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| 41 | ; HError_GetStatusAndErrorRegistersToAXandStoreThemToBDA
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| 42 | ; Parameters:
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| 43 | ; DS: RAMVARS segment
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| 44 | ; Returns:
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| 45 | ; AL: IDE Status Register contents
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| 46 | ; AH: IDE Error Register contents
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| 47 | ; Corrupts registers:
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| 48 | ; Nothing
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| 49 | ;--------------------------------------------------------------------
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| 50 | ALIGN JUMP_ALIGN
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| 51 | HError_GetStatusAndErrorRegistersToAXandStoreThemToBDA:
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| 52 | push ds
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| 53 | push dx
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| 54 |
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| 55 | mov dx, [RAMVARS.wIdeBase] ; Load IDE base port address
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| 56 | inc dx ; Increment to Error Register
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| 57 | in al, dx ; Read Error Register...
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| 58 | mov ah, al ; ...and copy it to AH
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| 59 | add dx, BYTE REGR_IDE_ST - REGR_IDE_ERROR
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| 60 | in al, dx ; Read Status Register to AL
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| 61 |
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| 62 | LOAD_BDA_SEGMENT_TO ds, dx
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| 63 | mov [HDBDA.wHDStAndErr], ax
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| 64 |
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| 65 | pop dx
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| 66 | pop ds
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| 67 | ret
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| 68 |
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| 69 |
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| 70 | ;--------------------------------------------------------------------
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| 71 | ; GetBiosErrorCodeToAHfromStatusAndErrorRegistersInAX
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| 72 | ; Parameters:
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| 73 | ; AL: IDE Status Register contents
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| 74 | ; AH: IDE Error Register contents
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| 75 | ; Returns:
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| 76 | ; AH: BIOS INT 13h error code
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| 77 | ; CF: Set if error
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| 78 | ; Cleared if no error
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| 79 | ; Corrupts registers:
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| 80 | ; Nothing
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| 81 | ;--------------------------------------------------------------------
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| 82 | ALIGN JUMP_ALIGN
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| 83 | GetBiosErrorCodeToAHfromStatusAndErrorRegistersInAX:
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| 84 | test al, FLG_IDE_ST_BSY
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| 85 | jz SHORT .CheckErrorBitsFromStatusRegisterInAL
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| 86 | mov ah, RET_HD_TIMEOUT
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| 87 | jmp SHORT .ReturnBiosErrorCodeInAH
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| 88 |
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| 89 | ALIGN JUMP_ALIGN
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| 90 | .CheckErrorBitsFromStatusRegisterInAL:
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| 91 | test al, FLG_IDE_ST_DF | FLG_IDE_ST_CORR | FLG_IDE_ST_ERR
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| 92 | jnz SHORT .ProcessErrorFromStatusRegisterInAL
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| 93 | xor ah, ah ; No errors, zero AH and CF
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| 94 | ret
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| 95 |
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| 96 | .ProcessErrorFromStatusRegisterInAL:
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| 97 | test al, FLG_IDE_ST_ERR ; Error specified in Error register?
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| 98 | jnz SHORT .ConvertBiosErrorToAHfromErrorRegisterInAH
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| 99 | mov ah, RET_HD_ECC ; Assume ECC corrected error
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| 100 | test al, FLG_IDE_ST_CORR ; ECC corrected error?
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| 101 | jnz SHORT .ReturnBiosErrorCodeInAH
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| 102 | mov ah, RET_HD_CONTROLLER ; Must be Device Fault
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| 103 | jmp SHORT .ReturnBiosErrorCodeInAH
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| 104 |
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| 105 | .ConvertBiosErrorToAHfromErrorRegisterInAH:
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| 106 | push bx
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| 107 | mov bx, .rgbRetCodeLookup
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| 108 | .ErrorBitLoop:
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| 109 | rcr ah, 1 ; Set CF if error bit set
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| 110 | jc SHORT .LookupErrorCode
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| 111 | inc bx
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| 112 | cmp bx, .rgbRetCodeLookup + 8
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| 113 | jb SHORT .ErrorBitLoop ; Loop until all bits checked
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| 114 | .LookupErrorCode:
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| 115 | mov ah, [cs:bx+.rgbRetCodeLookup]
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| 116 | pop bx
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| 117 |
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| 118 | .ReturnBiosErrorCodeInAH:
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| 119 | stc ; Set CF since error
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| 120 | ret
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| 121 |
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| 122 | .rgbRetCodeLookup:
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| 123 | db RET_HD_ADDRMARK ; Bit0=AMNF, Address Mark Not Found
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| 124 | db RET_HD_SEEK_FAIL ; Bit1=TK0NF, Track 0 Not Found
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| 125 | db RET_HD_INVALID ; Bit2=ABRT, Aborted Command
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| 126 | db RET_HD_NOTLOCKED ; Bit3=MCR, Media Change Requested
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| 127 | db RET_HD_NOT_FOUND ; Bit4=IDNF, ID Not Found
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| 128 | db RET_HD_LOCKED ; Bit5=MC, Media Changed
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| 129 | db RET_HD_UNCORRECC ; Bit6=UNC, Uncorrectable Data Error
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| 130 | db RET_HD_BADSECTOR ; Bit7=BBK, Bad Block Detected
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| 131 | db RET_HD_STATUSERR ; When Error Register is zero
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