| 1 | ; Project name : XTIDE Universal BIOS
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| 2 | ; Description : Int 13h function AH=41h, Check if Extensions Present.
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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=41h, Check if Extensions Present.
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| 25 | ;
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| 26 | ; AH41h_HandlerForCheckIfExtensionsPresent
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| 27 | ; Parameters:
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| 28 | ; DL: Translated Drive number
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| 29 | ; DS:DI: Ptr to DPT (in RAMVARS segment)
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| 30 | ; SS:BP: Ptr to IDEPACK
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| 31 | ; Parameters on INTPACK:
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| 32 | ; BX: 55AAh
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| 33 | ; Returns with INTPACK:
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| 34 | ; AH: Major version of EBIOS extensions
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| 35 | ; BX: AA55h
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| 36 | ; CX: Support bits
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| 37 | ; CF: 0 if successful, 1 if error
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| 38 | ;--------------------------------------------------------------------
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| 39 | AH41h_HandlerForCheckIfExtensionsPresent:
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| 40 | cmp WORD [bp+IDEPACK.intpack+INTPACK.bx], 55AAh
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| 41 | jne SHORT .EbiosNotSupported
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| 42 |
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| 43 | mov BYTE [bp+IDEPACK.intpack+INTPACK.ah], EBIOS_VERSION
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| 44 | mov WORD [bp+IDEPACK.intpack+INTPACK.bx], 0AA55h
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| 45 | mov WORD [bp+IDEPACK.intpack+INTPACK.cx], ENHANCED_DRIVE_ACCESS_SUPPORT
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| 46 | and BYTE [bp+IDEPACK.intpack+INTPACK.flags], ~FLG_FLAGS_CF ; Return with CF cleared
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| 47 | jmp Int13h_ReturnFromHandlerWithoutStoringErrorCode
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| 48 | .EbiosNotSupported:
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| 49 | jmp Int13h_DirectCallToAnotherBios
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