1 | ; Project name : XTIDE Universal BIOS
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2 | ; Description : Int 13h function AH=Ch, Seek.
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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=Ch, Seek.
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25 | ;
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26 | ; AHCh_HandlerForSeek
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27 | ; Parameters:
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28 | ; CX, DH: 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 IDEREGS_AND_INTPACK
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32 | ; Parameters on INTPACK:
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33 | ; CH: Cylinder number, bits 7...0
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34 | ; CL: Bits 7...6: Cylinder number bits 9 and 8
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35 | ; Bits 5...0: Starting sector number (1...63)
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36 | ; DH: Starting head number (0...255)
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37 | ; Returns with INTPACK:
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38 | ; AH: BIOS Error code
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39 | ; CF: 0 if successful, 1 if error
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40 | ;--------------------------------------------------------------------
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41 | ALIGN JUMP_ALIGN
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42 | AHCh_HandlerForSeek:
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43 | %ifndef USE_186
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44 | call AHCh_SeekToCylinder
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45 | jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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46 | %else
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47 | push Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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48 | ; Fall to AHCh_SeekToCylinder
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49 | %endif
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50 |
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51 | ;--------------------------------------------------------------------
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52 | ; AHCh_SeekToCylinder
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53 | ; Parameters:
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54 | ; CH: Cylinder number, bits 7...0
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55 | ; CL: Bits 7...6: Cylinder number bits 9 and 8
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56 | ; Bits 5...0: Starting sector number (1...63)
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57 | ; DH: Starting head number (0...255)
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58 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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59 | ; SS:BP: Ptr to IDEREGS_AND_INTPACK
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60 | ; Returns:
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61 | ; AH: BIOS Error code
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62 | ; CF: 0 if successful, 1 if error
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63 | ; Corrupts registers:
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64 | ; AL, BX, CX, DX
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65 | ;--------------------------------------------------------------------
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66 | AHCh_SeekToCylinder:
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67 | mov ah, COMMAND_SEEK
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68 | mov bx, TIMEOUT_AND_STATUS_TO_WAIT(TIMEOUT_DRQ, FLG_STATUS_DRDY)
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69 | jmp Idepack_TranslateOldInt13hAddressAndIssueCommandFromAH
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