| [3] | 1 | ; Project name : IDE BIOS
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| 2 | ; Description : Error checking functions for BIOS Hard disk 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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| [28] | 8 | ; HError_ProcessTimeoutAfterPollingBSYandSomeOtherStatusBit
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| 9 | ; HError_ProcessErrorsAfterPollingBSY
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| [3] | 10 | ; Parameters:
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| [28] | 11 | ; DS: RAMVARS segment
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| [3] | 12 | ; Returns:
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| [28] | 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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| [3] | 16 | ; Corrupts registers:
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| [28] | 17 | ; AL
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| [3] | 18 | ;--------------------------------------------------------------------
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| 19 | ALIGN JUMP_ALIGN
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| [28] | 20 | HError_ProcessTimeoutAfterPollingBSYandSomeOtherStatusBit:
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| 21 | call HError_GetStatusAndErrorRegistersToAXandStoreThemToBDA
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| 22 | call GetBiosErrorCodeToAHfromStatusAndErrorRegistersInAX
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| [35] | 23 | jc SHORT .ReturnErrorCodeInAH
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| [28] | 24 | mov ah, RET_HD_TIMEOUT ; Force timeout since no actual error...
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| 25 | stc ; ...but wanted bit was never set
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| [35] | 26 | .ReturnErrorCodeInAH:
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| 27 | ret
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| [28] | 28 |
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| 29 |
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| 30 | ALIGN JUMP_ALIGN
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| 31 | HError_ProcessErrorsAfterPollingBSY:
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| [86] | 32 | %ifndef USE_186
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| [28] | 33 | call HError_GetStatusAndErrorRegistersToAXandStoreThemToBDA
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| [35] | 34 | jmp SHORT GetBiosErrorCodeToAHfromStatusAndErrorRegistersInAX
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| [86] | 35 | %else
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| 36 | push GetBiosErrorCodeToAHfromStatusAndErrorRegistersInAX
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| 37 | ; Fall through to HError_GetStatusAndErrorRegistersToAXandStoreThemToBDA
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| 38 | %endif
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| [28] | 39 |
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| [3] | 40 |
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| 41 | ;--------------------------------------------------------------------
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| [28] | 42 | ; HError_GetStatusAndErrorRegistersToAXandStoreThemToBDA
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| [3] | 43 | ; Parameters:
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| [28] | 44 | ; DS: RAMVARS segment
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| [3] | 45 | ; Returns:
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| [28] | 46 | ; AL: IDE Status Register contents
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| 47 | ; AH: IDE Error Register contents
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| [3] | 48 | ; Corrupts registers:
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| [35] | 49 | ; Nothing
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| [3] | 50 | ;--------------------------------------------------------------------
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| 51 | ALIGN JUMP_ALIGN
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| [28] | 52 | HError_GetStatusAndErrorRegistersToAXandStoreThemToBDA:
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| [35] | 53 | push ds
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| 54 | push dx
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| 55 |
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| [28] | 56 | mov dx, [RAMVARS.wIdeBase] ; Load IDE base port address
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| 57 | inc dx ; Increment to Error Register
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| 58 | in al, dx ; Read Error Register...
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| 59 | mov ah, al ; ...and copy it to AH
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| 60 | add dx, BYTE REGR_IDE_ST - REGR_IDE_ERROR
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| 61 | in al, dx ; Read Status Register to AL
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| 62 |
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| 63 | LOAD_BDA_SEGMENT_TO ds, dx
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| 64 | mov [HDBDA.wHDStAndErr], ax
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| [35] | 65 |
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| 66 | pop dx
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| 67 | pop ds
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| [28] | 68 | ret
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| 69 |
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| 70 |
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| 71 | ;--------------------------------------------------------------------
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| 72 | ; GetBiosErrorCodeToAHfromStatusAndErrorRegistersInAX
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| 73 | ; Parameters:
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| 74 | ; AL: IDE Status Register contents
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| 75 | ; AH: IDE Error Register contents
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| 76 | ; Returns:
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| 77 | ; AH: BIOS INT 13h error code
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| 78 | ; CF: Set if error
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| 79 | ; Cleared if no error
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| 80 | ; Corrupts registers:
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| 81 | ; Nothing
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| 82 | ;--------------------------------------------------------------------
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| 83 | ALIGN JUMP_ALIGN
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| 84 | GetBiosErrorCodeToAHfromStatusAndErrorRegistersInAX:
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| [27] | 85 | test al, FLG_IDE_ST_BSY
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| [28] | 86 | jz SHORT .CheckErrorBitsFromStatusRegisterInAL
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| 87 | mov ah, RET_HD_TIMEOUT
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| 88 | jmp SHORT .ReturnBiosErrorCodeInAH
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| 89 |
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| 90 | ALIGN JUMP_ALIGN
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| 91 | .CheckErrorBitsFromStatusRegisterInAL:
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| [3] | 92 | test al, FLG_IDE_ST_DF | FLG_IDE_ST_CORR | FLG_IDE_ST_ERR
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| [28] | 93 | jnz SHORT .ProcessErrorFromStatusRegisterInAL
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| [3] | 94 | xor ah, ah ; No errors, zero AH and CF
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| 95 | ret
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| 96 |
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| [28] | 97 | .ProcessErrorFromStatusRegisterInAL:
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| [3] | 98 | test al, FLG_IDE_ST_ERR ; Error specified in Error register?
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| [28] | 99 | jnz SHORT .ConvertBiosErrorToAHfromErrorRegisterInAH
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| [3] | 100 | mov ah, RET_HD_ECC ; Assume ECC corrected error
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| 101 | test al, FLG_IDE_ST_CORR ; ECC corrected error?
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| [28] | 102 | jnz SHORT .ReturnBiosErrorCodeInAH
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| [3] | 103 | mov ah, RET_HD_CONTROLLER ; Must be Device Fault
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| [28] | 104 | jmp SHORT .ReturnBiosErrorCodeInAH
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| [3] | 105 |
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| [28] | 106 | .ConvertBiosErrorToAHfromErrorRegisterInAH:
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| [3] | 107 | push bx
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| [28] | 108 | mov bx, .rgbRetCodeLookup
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| 109 | .ErrorBitLoop:
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| 110 | rcr ah, 1 ; Set CF if error bit set
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| 111 | jc SHORT .LookupErrorCode
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| 112 | inc bx
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| 113 | cmp bx, .rgbRetCodeLookup + 8
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| 114 | jb SHORT .ErrorBitLoop ; Loop until all bits checked
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| 115 | .LookupErrorCode:
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| [3] | 116 | mov ah, [cs:bx+.rgbRetCodeLookup]
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| 117 | pop bx
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| [28] | 118 |
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| 119 | .ReturnBiosErrorCodeInAH:
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| [3] | 120 | stc ; Set CF since error
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| 121 | ret
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| 122 |
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| 123 | .rgbRetCodeLookup:
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| 124 | db RET_HD_ADDRMARK ; Bit0=AMNF, Address Mark Not Found
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| 125 | db RET_HD_SEEK_FAIL ; Bit1=TK0NF, Track 0 Not Found
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| 126 | db RET_HD_INVALID ; Bit2=ABRT, Aborted Command
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| 127 | db RET_HD_NOTLOCKED ; Bit3=MCR, Media Change Requested
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| 128 | db RET_HD_NOT_FOUND ; Bit4=IDNF, ID Not Found
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| 129 | db RET_HD_LOCKED ; Bit5=MC, Media Changed
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| 130 | db RET_HD_UNCORRECC ; Bit6=UNC, Uncorrectable Data Error
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| 131 | db RET_HD_BADSECTOR ; Bit7=BBK, Bad Block Detected
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| [28] | 132 | db RET_HD_STATUSERR ; When Error Register is zero
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