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 | ; |
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5 | ; XTIDE Universal BIOS and Associated Tools |
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6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team. |
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7 | ; |
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8 | ; This program is free software; you can redistribute it and/or modify |
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9 | ; it under the terms of the GNU General Public License as published by |
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10 | ; the Free Software Foundation; either version 2 of the License, or |
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11 | ; (at your option) any later version. |
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12 | ; |
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13 | ; This program is distributed in the hope that it will be useful, |
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14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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16 | ; GNU General Public License for more details. |
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17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
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18 | ; |
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19 | |
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20 | ; Section containing code |
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21 | SECTION .text |
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22 | |
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23 | ;-------------------------------------------------------------------- |
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24 | ; Int 13h function AH=2h, Read Disk Sectors. |
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25 | ; |
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26 | ; AH2h_HandlerForReadDiskSectors |
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27 | ; Parameters: |
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28 | ; AL, CX, DH, ES: Same as in INTPACK |
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29 | ; DL: Translated Drive number |
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30 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
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31 | ; SS:BP: Ptr to IDEPACK |
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32 | ; Parameters on INTPACK: |
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33 | ; AL: Number of sectors to read (1...128) |
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34 | ; CH: Cylinder number, bits 7...0 |
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35 | ; CL: Bits 7...6: Cylinder number bits 9 and 8 |
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36 | ; Bits 5...0: Starting sector number (1...63) |
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37 | ; DH: Starting head number (0...255) |
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38 | ; ES:BX: Pointer to buffer receiving data |
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39 | ; Returns with INTPACK: |
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40 | ; AH: Int 13h/40h floppy return status |
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41 | ; AL: Burst error length if AH returns 11h (we never return error code 11h) |
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42 | ; Number of sectors actually read (only valid if CF set for someBIOSes) |
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43 | ; CF: 0 if successful, 1 if error |
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44 | ;-------------------------------------------------------------------- |
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45 | ALIGN JUMP_ALIGN |
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46 | AH2h_HandlerForReadDiskSectors: |
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47 | call Prepare_BufferToESSIforOldInt13hTransfer |
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48 | call Prepare_GetOldInt13hCommandIndexToBX |
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49 | mov ah, [cs:bx+g_rgbReadCommandLookup] |
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50 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRQ) |
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51 | %ifdef USE_186 |
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52 | push Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAHandTransferredSectorsFromCL |
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53 | jmp Idepack_TranslateOldInt13hAddressAndIssueCommandFromAH |
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54 | %else |
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55 | call Idepack_TranslateOldInt13hAddressAndIssueCommandFromAH |
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56 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAHandTransferredSectorsFromCL |
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57 | %endif |
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58 | |
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