[3] | 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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[28] | 4 | ; Last update : 1.8.2010 |
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[3] | 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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[28] | 12 | ; HError_ProcessErrorsAfterPollingTaskFlag |
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[27] | 13 | ; Parameters: |
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[28] | 14 | ; DS: RAMVARS segment |
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| 15 | ; ES: BDA segment (zero) |
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| 16 | ; CF: Set if timeout |
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| 17 | ; Cleared if task flag was properly set |
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[27] | 18 | ; Returns: |
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[28] | 19 | ; AH: BIOS error code |
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| 20 | ; CF: Set if error |
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| 21 | ; Cleared if no error |
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[27] | 22 | ; Corrupts registers: |
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[28] | 23 | ; AL |
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[27] | 24 | ;-------------------------------------------------------------------- |
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| 25 | ALIGN JUMP_ALIGN |
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[28] | 26 | HError_ProcessErrorsAfterPollingTaskFlag: |
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| 27 | jc SHORT HError_ProcessTimeoutAfterPollingBSYandSomeOtherStatusBit |
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| 28 | mov ax, [es:HDBDA.wHDStAndErr] |
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| 29 | call GetBiosErrorCodeToAHfromStatusAndErrorRegistersInAX |
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| 30 | mov [es:BDA.bHDLastSt], ah |
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| 31 | mov BYTE [es:BDA.bHDTaskFlg], 0 |
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| 32 | ret |
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[27] | 33 | |
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| 34 | ;-------------------------------------------------------------------- |
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[28] | 35 | ; HError_ProcessTimeoutAfterPollingBSYandSomeOtherStatusBit |
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| 36 | ; HError_ProcessErrorsAfterPollingBSY |
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[3] | 37 | ; Parameters: |
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[28] | 38 | ; DS: RAMVARS segment |
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[3] | 39 | ; Returns: |
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[28] | 40 | ; AH: BIOS error code |
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| 41 | ; CF: Set if error |
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| 42 | ; Cleared if no error |
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[3] | 43 | ; Corrupts registers: |
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[28] | 44 | ; AL |
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[3] | 45 | ;-------------------------------------------------------------------- |
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| 46 | ALIGN JUMP_ALIGN |
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[28] | 47 | HError_ProcessTimeoutAfterPollingBSYandSomeOtherStatusBit: |
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| 48 | push ds |
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| 49 | push dx |
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[3] | 50 | |
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[28] | 51 | call HError_GetStatusAndErrorRegistersToAXandStoreThemToBDA |
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| 52 | call GetBiosErrorCodeToAHfromStatusAndErrorRegistersInAX |
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| 53 | jc SHORT StoreErrorCodeFromAHtoBDA |
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| 54 | mov ah, RET_HD_TIMEOUT ; Force timeout since no actual error... |
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| 55 | stc ; ...but wanted bit was never set |
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| 56 | jmp SHORT StoreErrorCodeFromAHtoBDA |
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| 57 | |
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| 58 | |
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| 59 | ALIGN JUMP_ALIGN |
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| 60 | HError_ProcessErrorsAfterPollingBSY: |
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[3] | 61 | push ds |
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[28] | 62 | push dx |
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| 63 | |
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| 64 | call HError_GetStatusAndErrorRegistersToAXandStoreThemToBDA |
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| 65 | call GetBiosErrorCodeToAHfromStatusAndErrorRegistersInAX |
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| 66 | StoreErrorCodeFromAHtoBDA: |
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| 67 | mov [BDA.bHDLastSt], ah ; Store BIOS error code to BDA |
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| 68 | |
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| 69 | pop dx |
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[3] | 70 | pop ds |
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[28] | 71 | ret |
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[3] | 72 | |
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[28] | 73 | |
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[3] | 74 | ;-------------------------------------------------------------------- |
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[28] | 75 | ; HError_GetStatusAndErrorRegistersToAXandStoreThemToBDA |
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[3] | 76 | ; Parameters: |
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[28] | 77 | ; DS: RAMVARS segment |
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[3] | 78 | ; Returns: |
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[28] | 79 | ; AL: IDE Status Register contents |
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| 80 | ; AH: IDE Error Register contents |
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| 81 | ; DS: BDA segment |
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[3] | 82 | ; Corrupts registers: |
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[28] | 83 | ; DX |
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[3] | 84 | ;-------------------------------------------------------------------- |
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| 85 | ALIGN JUMP_ALIGN |
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[28] | 86 | HError_GetStatusAndErrorRegistersToAXandStoreThemToBDA: |
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| 87 | mov dx, [RAMVARS.wIdeBase] ; Load IDE base port address |
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| 88 | inc dx ; Increment to Error Register |
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| 89 | in al, dx ; Read Error Register... |
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| 90 | mov ah, al ; ...and copy it to AH |
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| 91 | add dx, BYTE REGR_IDE_ST - REGR_IDE_ERROR |
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| 92 | in al, dx ; Read Status Register to AL |
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| 93 | ; Fall to .StoreStatusAndErrorRegistersFromAXtoBDA |
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| 94 | |
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| 95 | ;-------------------------------------------------------------------- |
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| 96 | ; .StoreStatusAndErrorRegistersFromAXtoBDA |
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| 97 | ; Parameters: |
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| 98 | ; AL: IDE Status Register contents |
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| 99 | ; AH: IDE Error Register contents |
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| 100 | ; Returns: |
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| 101 | ; DS: BDA segment (zero) |
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| 102 | ; Corrupts registers: |
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| 103 | ; DX |
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| 104 | ;-------------------------------------------------------------------- |
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| 105 | .StoreStatusAndErrorRegistersFromAXtoBDA: |
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| 106 | LOAD_BDA_SEGMENT_TO ds, dx |
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| 107 | mov [HDBDA.wHDStAndErr], ax |
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| 108 | ret |
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| 109 | |
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| 110 | |
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| 111 | ;-------------------------------------------------------------------- |
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| 112 | ; GetBiosErrorCodeToAHfromStatusAndErrorRegistersInAX |
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| 113 | ; Parameters: |
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| 114 | ; AL: IDE Status Register contents |
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| 115 | ; AH: IDE Error Register contents |
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| 116 | ; Returns: |
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| 117 | ; AH: BIOS INT 13h error code |
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| 118 | ; CF: Set if error |
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| 119 | ; Cleared if no error |
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| 120 | ; Corrupts registers: |
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| 121 | ; Nothing |
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| 122 | ;-------------------------------------------------------------------- |
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| 123 | ALIGN JUMP_ALIGN |
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| 124 | GetBiosErrorCodeToAHfromStatusAndErrorRegistersInAX: |
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[27] | 125 | test al, FLG_IDE_ST_BSY |
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[28] | 126 | jz SHORT .CheckErrorBitsFromStatusRegisterInAL |
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| 127 | mov ah, RET_HD_TIMEOUT |
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| 128 | jmp SHORT .ReturnBiosErrorCodeInAH |
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| 129 | |
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| 130 | ALIGN JUMP_ALIGN |
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| 131 | .CheckErrorBitsFromStatusRegisterInAL: |
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[3] | 132 | test al, FLG_IDE_ST_DF | FLG_IDE_ST_CORR | FLG_IDE_ST_ERR |
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[28] | 133 | jnz SHORT .ProcessErrorFromStatusRegisterInAL |
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[3] | 134 | xor ah, ah ; No errors, zero AH and CF |
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| 135 | ret |
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| 136 | |
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[28] | 137 | .ProcessErrorFromStatusRegisterInAL: |
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[3] | 138 | test al, FLG_IDE_ST_ERR ; Error specified in Error register? |
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[28] | 139 | jnz SHORT .ConvertBiosErrorToAHfromErrorRegisterInAH |
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[3] | 140 | mov ah, RET_HD_ECC ; Assume ECC corrected error |
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| 141 | test al, FLG_IDE_ST_CORR ; ECC corrected error? |
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[28] | 142 | jnz SHORT .ReturnBiosErrorCodeInAH |
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[3] | 143 | mov ah, RET_HD_CONTROLLER ; Must be Device Fault |
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[28] | 144 | jmp SHORT .ReturnBiosErrorCodeInAH |
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[3] | 145 | |
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[28] | 146 | .ConvertBiosErrorToAHfromErrorRegisterInAH: |
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[3] | 147 | push bx |
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[28] | 148 | mov bx, .rgbRetCodeLookup |
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| 149 | .ErrorBitLoop: |
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| 150 | rcr ah, 1 ; Set CF if error bit set |
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| 151 | jc SHORT .LookupErrorCode |
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| 152 | inc bx |
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| 153 | cmp bx, .rgbRetCodeLookup + 8 |
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| 154 | jb SHORT .ErrorBitLoop ; Loop until all bits checked |
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| 155 | .LookupErrorCode: |
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[3] | 156 | mov ah, [cs:bx+.rgbRetCodeLookup] |
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| 157 | pop bx |
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[28] | 158 | |
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| 159 | .ReturnBiosErrorCodeInAH: |
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[3] | 160 | stc ; Set CF since error |
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| 161 | ret |
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| 162 | |
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| 163 | .rgbRetCodeLookup: |
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| 164 | db RET_HD_ADDRMARK ; Bit0=AMNF, Address Mark Not Found |
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| 165 | db RET_HD_SEEK_FAIL ; Bit1=TK0NF, Track 0 Not Found |
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| 166 | db RET_HD_INVALID ; Bit2=ABRT, Aborted Command |
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| 167 | db RET_HD_NOTLOCKED ; Bit3=MCR, Media Change Requested |
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| 168 | db RET_HD_NOT_FOUND ; Bit4=IDNF, ID Not Found |
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| 169 | db RET_HD_LOCKED ; Bit5=MC, Media Changed |
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| 170 | db RET_HD_UNCORRECC ; Bit6=UNC, Uncorrectable Data Error |
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| 171 | db RET_HD_BADSECTOR ; Bit7=BBK, Bad Block Detected |
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[28] | 172 | db RET_HD_STATUSERR ; When Error Register is zero |
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| 173 | |
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| 174 | |
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| 175 | ;-------------------------------------------------------------------- |
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| 176 | ; HError_StoreBiosErrorCodeFromAHtoBDA |
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| 177 | ; Parameters: |
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| 178 | ; AH: BIOS error code |
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| 179 | ; Returns: |
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| 180 | ; Nothing |
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| 181 | ; Corrupts registers: |
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| 182 | ; DI |
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| 183 | ;-------------------------------------------------------------------- |
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| 184 | ALIGN JUMP_ALIGN |
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| 185 | HError_StoreBiosErrorCodeFromAHtoBDA: |
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| 186 | push ds |
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| 187 | mov di, 0 ; Zero DI and preserve FLAGS |
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| 188 | mov ds, di ; Copy BDA segment to DS |
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| 189 | mov [BDA.bHDLastSt], ah |
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| 190 | pop ds |
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| 191 | ret |
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