| 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, 2011-2013 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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