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