1 | ; Project name : XTIDE Universal BIOS |
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2 | ; Description : Int 13h function AH=2h, Read Disk Sectors. |
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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 | ; Int 13h function AH=2h, Read Disk Sectors. |
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9 | ; |
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10 | ; AH2h_HandlerForReadDiskSectors |
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11 | ; Parameters: |
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12 | ; AL, CX, DH, ES: Same as in INTPACK |
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13 | ; DL: Translated Drive number |
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14 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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15 | ; SS:BP: Ptr to IDEPACK |
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16 | ; Parameters on INTPACK: |
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17 | ; AL: Number of sectors to read (1...127) |
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18 | ; CH: Cylinder number, bits 7...0 |
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19 | ; CL: Bits 7...6: Cylinder number bits 9 and 8 |
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20 | ; Bits 5...0: Starting sector number (1...63) |
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21 | ; DH: Starting head number (0...255) |
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22 | ; ES:BX: Pointer to buffer recieving data |
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23 | ; Returns with INTPACK: |
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24 | ; AH: Int 13h/40h floppy return status |
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25 | ; AL: Burst error length if AH returns 11h, undefined otherwise |
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26 | ; CF: 0 if successfull, 1 if error |
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27 | ;-------------------------------------------------------------------- |
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28 | ALIGN JUMP_ALIGN |
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29 | AH2h_HandlerForReadDiskSectors: |
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30 | cmp al, 0 |
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31 | jle SHORT AH2h_ExitInt13hSinceSectorCountInIntpackIsZero |
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32 | |
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33 | call CommandLookup_GetOldInt13hIndexToBX |
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34 | mov ah, [cs:bx+g_rgbReadCommandLookup] |
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35 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRQ) |
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36 | mov si, [bp+IDEPACK.intpack+INTPACK.bx] |
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37 | %ifdef USE_186 |
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38 | push Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH |
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39 | jmp Idepack_TranslateOldInt13hAddressAndIssueCommandFromAH |
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40 | %else |
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41 | call Idepack_TranslateOldInt13hAddressAndIssueCommandFromAH |
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42 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH |
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43 | %endif |
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44 | |
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45 | |
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46 | ;-------------------------------------------------------------------- |
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47 | ; AH2h_ExitInt13hSinceSectorCountInIntpackIsZero |
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48 | ; Parameters: |
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49 | ; Nothing |
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50 | ; Returns: |
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51 | ; Jumps to Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH |
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52 | ;-------------------------------------------------------------------- |
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53 | AH2h_ExitInt13hSinceSectorCountInIntpackIsZero: |
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54 | mov ah, RET_HD_INVALID |
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55 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH |
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