| 1 | ; Project name : XTIDE Universal BIOS
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| 2 | ; Description : IDE Device error functions.
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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 | ; IdeError_GetBiosErrorCodeToAHfromPolledStatusRegisterInAL
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| 9 | ; Parameters:
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| 10 | ; AL: IDE Status Register contents
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| 11 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 12 | ; Returns:
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| 13 | ; AH: BIOS error code
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| 14 | ; CF: Set if error
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| 15 | ; Cleared if no error
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| 16 | ; Corrupts registers:
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| 17 | ; AL, BX, DX
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| 18 | ;--------------------------------------------------------------------
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| 19 | ALIGN JUMP_ALIGN
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| 20 | IdeError_GetBiosErrorCodeToAHfromPolledStatusRegisterInAL:
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| 21 | mov ah, al ; IDE Status Register to AH
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| 22 | mov dl, ERROR_REGISTER_in
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| 23 | call Device_InputToALfromIdeRegisterInDL
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| 24 | xchg al, ah ; Status Register now in AL, Error Register now in AH
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| 25 |
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| 26 | ; I don't think anything actually reads these from BDA
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| 27 | push ds
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| 28 | LOAD_BDA_SEGMENT_TO ds, dx
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| 29 | mov [HDBDA.wHDStAndErr], ax
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| 30 | pop ds
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| 31 |
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| 32 | ; Fall to GetBiosErrorCodeToAHfromStatusAndErrorRegistersInAX
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| 33 |
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| 34 |
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| 35 | ;--------------------------------------------------------------------
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| 36 | ; GetBiosErrorCodeToAHfromStatusAndErrorRegistersInAX
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| 37 | ; Parameters:
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| 38 | ; AL: IDE Status Register contents
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| 39 | ; AH: IDE Error Register contents
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| 40 | ; Returns:
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| 41 | ; AH: BIOS INT 13h error code
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| 42 | ; CF: Set if error
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| 43 | ; Cleared if no error
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| 44 | ; Corrupts registers:
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| 45 | ; BX
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| 46 | ;--------------------------------------------------------------------
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| 47 | ALIGN JUMP_ALIGN
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| 48 | GetBiosErrorCodeToAHfromStatusAndErrorRegistersInAX:
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| 49 | test al, FLG_STATUS_BSY
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| 50 | jz SHORT .CheckErrorBitsFromStatusRegisterInAL
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| 51 | mov ah, RET_HD_TIMEOUT
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| 52 | jmp SHORT .ReturnBiosErrorCodeInAH
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| 53 |
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| 54 | ALIGN JUMP_ALIGN
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| 55 | .CheckErrorBitsFromStatusRegisterInAL:
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| 56 | test al, FLG_STATUS_DF | FLG_STATUS_CORR | FLG_STATUS_ERR
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| 57 | jnz SHORT .ProcessErrorFromStatusRegisterInAL
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| 58 | xor ah, ah ; No errors, zero AH and CF
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| 59 | ret
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| 60 |
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| 61 | .ProcessErrorFromStatusRegisterInAL:
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| 62 | test al, FLG_STATUS_ERR ; Error specified in Error register?
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| 63 | jnz SHORT .ConvertBiosErrorToAHfromErrorRegisterInAH
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| 64 | mov ah, RET_HD_ECC ; Assume ECC corrected error
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| 65 | test al, FLG_STATUS_CORR ; ECC corrected error?
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| 66 | jnz SHORT .ReturnBiosErrorCodeInAH
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| 67 | mov ah, RET_HD_CONTROLLER ; Must be Device Fault
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| 68 | jmp SHORT .ReturnBiosErrorCodeInAH
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| 69 |
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| 70 | .ConvertBiosErrorToAHfromErrorRegisterInAH:
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| 71 | xor bx, bx ; Clear CF
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| 72 | .ErrorBitLoop:
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| 73 | rcr ah, 1 ; Set CF if error bit set
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| 74 | jc SHORT .LookupErrorCode
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| 75 | inc bx
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| 76 | test ah, ah ; Clear CF
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| 77 | jnz SHORT .ErrorBitLoop
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| 78 | .LookupErrorCode:
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| 79 | mov ah, [cs:bx+.rgbRetCodeLookup]
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| 80 | .ReturnBiosErrorCodeInAH:
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| 81 | stc ; Set CF since error
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| 82 | ret
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| 83 |
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| 84 | .rgbRetCodeLookup:
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| 85 | db RET_HD_ADDRMARK ; Bit0=AMNF, Address Mark Not Found
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| 86 | db RET_HD_SEEK_FAIL ; Bit1=TK0NF, Track 0 Not Found
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| 87 | db RET_HD_INVALID ; Bit2=ABRT, Aborted Command
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| 88 | db RET_HD_NOTLOCKED ; Bit3=MCR, Media Change Requested
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| 89 | db RET_HD_NOT_FOUND ; Bit4=IDNF, ID Not Found
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| 90 | db RET_HD_LOCKED ; Bit5=MC, Media Changed
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| 91 | db RET_HD_UNCORRECC ; Bit6=UNC, Uncorrectable Data Error
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| 92 | db RET_HD_BADSECTOR ; Bit7=BBK, Bad Block Detected
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| 93 | db RET_HD_STATUSERR ; When Error Register is zero
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