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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8 | ; HError_ProcessTimeoutAfterPollingBSYandSomeOtherStatusBit |
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9 | ; HError_ProcessErrorsAfterPollingBSY |
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10 | ; Parameters: |
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11 | ; DS: 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 |
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18 | ;-------------------------------------------------------------------- |
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19 | ALIGN JUMP_ALIGN |
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20 | HError_ProcessTimeoutAfterPollingBSYandSomeOtherStatusBit: |
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21 | call HError_GetStatusAndErrorRegistersToAXandStoreThemToBDA |
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22 | call GetBiosErrorCodeToAHfromStatusAndErrorRegistersInAX |
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23 | jc SHORT .ReturnErrorCodeInAH |
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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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26 | .ReturnErrorCodeInAH: |
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27 | ret |
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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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32 | %ifndef USE_186 |
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33 | call HError_GetStatusAndErrorRegistersToAXandStoreThemToBDA |
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34 | jmp SHORT GetBiosErrorCodeToAHfromStatusAndErrorRegistersInAX |
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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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39 | |
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40 | |
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41 | ;-------------------------------------------------------------------- |
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42 | ; HError_GetStatusAndErrorRegistersToAXandStoreThemToBDA |
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43 | ; Parameters: |
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44 | ; DS: RAMVARS segment |
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45 | ; Returns: |
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46 | ; AL: IDE Status Register contents |
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47 | ; AH: IDE Error Register contents |
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48 | ; Corrupts registers: |
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49 | ; Nothing |
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50 | ;-------------------------------------------------------------------- |
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51 | ALIGN JUMP_ALIGN |
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52 | HError_GetStatusAndErrorRegistersToAXandStoreThemToBDA: |
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53 | push ds |
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54 | push dx |
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55 | |
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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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65 | |
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66 | pop dx |
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67 | pop ds |
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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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85 | test al, FLG_IDE_ST_BSY |
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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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92 | test al, FLG_IDE_ST_DF | FLG_IDE_ST_CORR | FLG_IDE_ST_ERR |
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93 | jnz SHORT .ProcessErrorFromStatusRegisterInAL |
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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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97 | .ProcessErrorFromStatusRegisterInAL: |
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98 | test al, FLG_IDE_ST_ERR ; Error specified in Error register? |
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99 | jnz SHORT .ConvertBiosErrorToAHfromErrorRegisterInAH |
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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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102 | jnz SHORT .ReturnBiosErrorCodeInAH |
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103 | mov ah, RET_HD_CONTROLLER ; Must be Device Fault |
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104 | jmp SHORT .ReturnBiosErrorCodeInAH |
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105 | |
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106 | .ConvertBiosErrorToAHfromErrorRegisterInAH: |
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107 | push bx |
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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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116 | mov ah, [cs:bx+.rgbRetCodeLookup] |
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117 | pop bx |
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118 | |
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119 | .ReturnBiosErrorCodeInAH: |
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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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132 | db RET_HD_STATUSERR ; When Error Register is zero |
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