| 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 : 28.7.2010
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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_GetErrorCodeToAHforBitPollingTimeout
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| 13 | ; Parameters:
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| 14 | ; AL: IDE Status Register contents
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| 15 | ; DX: IDE Status Register Address
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| 16 | ; Returns:
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| 17 | ; AH: Hard disk BIOS error code
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| 18 | ; CF: Set since error
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| 19 | ; Corrupts registers:
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| 20 | ; AL, CX
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| 21 | ;--------------------------------------------------------------------
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| 22 | ALIGN JUMP_ALIGN
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| 23 | HError_GetErrorCodeToAHforBitPollingTimeout:
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| 24 | test al, FLG_IDE_ST_BSY ; Other bits undefined when BSY set
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| 25 | jnz SHORT HError_GetErrorCodeForStatusReg ; Busy, normal timeout
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| 26 | test al, FLG_IDE_ST_DF | FLG_IDE_ST_CORR | FLG_IDE_ST_ERR
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| 27 | jnz SHORT HError_GetErrorCodeForStatusReg ; Not busy but some error
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| 28 | or al, FLG_IDE_ST_BSY ; Polled bit got never set, force timeout
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| 29 | ; Fall to HError_GetErrorCodeForStatusReg
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| 30 |
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| 31 | ;--------------------------------------------------------------------
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| 32 | ; Converts Status Register error to BIOS error code.
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| 33 | ;
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| 34 | ; HError_GetErrorCodeForStatusReg
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| 35 | ; Parameters:
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| 36 | ; AL: IDE Status Register contents
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| 37 | ; DX: IDE Status Register Address
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| 38 | ; Returns:
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| 39 | ; AH: Hard disk BIOS error code
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| 40 | ; CF: 0 if no errors (AH=RET_HD_SUCCESS)
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| 41 | ; 1 if some error
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| 42 | ; Corrupts registers:
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| 43 | ; AL, CX
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| 44 | ;--------------------------------------------------------------------
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| 45 | ALIGN JUMP_ALIGN
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| 46 | HError_GetErrorCodeForStatusReg:
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| 47 | ; Get Error Register contents to AH
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| 48 | mov ah, al ; Backup Status Reg to AH
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| 49 | sub dx, BYTE REGR_IDE_ST-REGR_IDE_ERROR ; Status Reg to Error Reg
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| 50 | in al, dx ; Read Error Register to AL
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| 51 | xchg al, ah ; Swap status and error
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| 52 | add dx, BYTE REGR_IDE_ST-REGR_IDE_ERROR ; Restore DX
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| 53 |
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| 54 | ; Store Register contents to BDA
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| 55 | push ds
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| 56 | LOAD_BDA_SEGMENT_TO ds, cx
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| 57 | mov [HDBDA.wHDStAndErr], ax ; Store Status and Error to BDA
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| 58 | pop ds
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| 59 | ; Fall to HError_ConvertIdeErrorToBiosRet
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| 60 |
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| 61 | ;--------------------------------------------------------------------
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| 62 | ; Converts error flags from IDE status and error register contents
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| 63 | ; to BIOS Int 13h return value.
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| 64 | ;
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| 65 | ; HError_ConvertIdeErrorToBiosRet
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| 66 | ; Parameters:
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| 67 | ; AL: Status Register Contents
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| 68 | ; AH: Error Register Contents
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| 69 | ; Returns:
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| 70 | ; AH: Hard disk BIOS error code
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| 71 | ; CF: 0 if no errors (AH=RET_HD_SUCCESS)
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| 72 | ; 1 if any error
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| 73 | ; Corrupts registers:
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| 74 | ; AL
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| 75 | ;--------------------------------------------------------------------
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| 76 | ALIGN JUMP_ALIGN
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| 77 | HError_ConvertIdeErrorToBiosRet:
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| 78 | test al, FLG_IDE_ST_BSY
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| 79 | jnz SHORT .TimeoutError
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| 80 | test al, FLG_IDE_ST_DF | FLG_IDE_ST_CORR | FLG_IDE_ST_ERR
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| 81 | jnz SHORT .ReadErrorFromStatusReg
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| 82 | xor ah, ah ; No errors, zero AH and CF
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| 83 | ret
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| 84 |
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| 85 | .TimeoutError:
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| 86 | mov ah, RET_HD_TIMEOUT
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| 87 | stc
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| 88 | ret
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| 89 |
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| 90 | ; Convert error code based on status or error register
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| 91 | .ReadErrorFromStatusReg:
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| 92 | test al, FLG_IDE_ST_ERR ; Error specified in Error register?
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| 93 | jnz SHORT .ReadErrorFromErrorReg
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| 94 | mov ah, RET_HD_ECC ; Assume ECC corrected error
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| 95 | test al, FLG_IDE_ST_CORR ; ECC corrected error?
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| 96 | jnz SHORT .Return
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| 97 | mov ah, RET_HD_CONTROLLER ; Must be Device Fault
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| 98 | jmp SHORT .Return
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| 99 |
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| 100 | ; Convert error register to bios error code
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| 101 | .ReadErrorFromErrorReg:
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| 102 | push bx
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| 103 | mov al, ah ; Copy error reg to AL...
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| 104 | xor ah, ah ; ...and zero extend to AX
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| 105 | eBSF bx, ax ; Get bit index to BX
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| 106 | mov ah, RET_HD_STATUSERR ; Error code if Error Reg is zero
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| 107 | jz SHORT .SkipLookup ; Return if error register is zero
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| 108 | mov ah, [cs:bx+.rgbRetCodeLookup]
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| 109 | .SkipLookup:
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| 110 | pop bx
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| 111 | .Return:
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| 112 | stc ; Set CF since error
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| 113 | ret
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| 114 |
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| 115 | .rgbRetCodeLookup:
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| 116 | db RET_HD_ADDRMARK ; Bit0=AMNF, Address Mark Not Found
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| 117 | db RET_HD_SEEK_FAIL ; Bit1=TK0NF, Track 0 Not Found
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| 118 | db RET_HD_INVALID ; Bit2=ABRT, Aborted Command
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| 119 | db RET_HD_NOTLOCKED ; Bit3=MCR, Media Change Requested
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| 120 | db RET_HD_NOT_FOUND ; Bit4=IDNF, ID Not Found
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| 121 | db RET_HD_LOCKED ; Bit5=MC, Media Changed
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| 122 | db RET_HD_UNCORRECC ; Bit6=UNC, Uncorrectable Data Error
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| 123 | db RET_HD_BADSECTOR ; Bit7=BBK, Bad Block Detected
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