[165] | 1 | ; Project name : XTIDE Universal BIOS |
---|
| 2 | ; Description : Int 13h function AH=41h, Check if Extensions Present. |
---|
| 3 | |
---|
[376] | 4 | ; |
---|
| 5 | ; XTIDE Universal BIOS and Associated Tools |
---|
| 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team. |
---|
| 7 | ; |
---|
| 8 | ; This program is free software; you can redistribute it and/or modify |
---|
| 9 | ; it under the terms of the GNU General Public License as published by |
---|
| 10 | ; the Free Software Foundation; either version 2 of the License, or |
---|
| 11 | ; (at your option) any later version. |
---|
| 12 | ; |
---|
| 13 | ; This program is distributed in the hope that it will be useful, |
---|
| 14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of |
---|
| 15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
---|
| 16 | ; GNU General Public License for more details. |
---|
| 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
---|
| 18 | ; |
---|
| 19 | |
---|
[165] | 20 | ; Section containing code |
---|
| 21 | SECTION .text |
---|
| 22 | |
---|
| 23 | ;-------------------------------------------------------------------- |
---|
| 24 | ; Int 13h function AH=41h, Check if Extensions Present. |
---|
| 25 | ; |
---|
| 26 | ; AH41h_HandlerForCheckIfExtensionsPresent |
---|
| 27 | ; Parameters: |
---|
| 28 | ; DL: Translated Drive number |
---|
| 29 | ; DS:DI: Ptr to DPT (in RAMVARS segment) |
---|
| 30 | ; SS:BP: Ptr to IDEPACK |
---|
| 31 | ; Parameters on INTPACK: |
---|
| 32 | ; BX: 55AAh |
---|
| 33 | ; Returns with INTPACK: |
---|
| 34 | ; AH: Major version of EBIOS extensions |
---|
[167] | 35 | ; BX: AA55h |
---|
[165] | 36 | ; CX: Support bits |
---|
[294] | 37 | ; CF: 0 if successful, 1 if error |
---|
[165] | 38 | ;-------------------------------------------------------------------- |
---|
| 39 | AH41h_HandlerForCheckIfExtensionsPresent: |
---|
| 40 | cmp WORD [bp+IDEPACK.intpack+INTPACK.bx], 55AAh |
---|
| 41 | jne SHORT .EbiosNotSupported |
---|
| 42 | |
---|
[167] | 43 | mov BYTE [bp+IDEPACK.intpack+INTPACK.ah], EBIOS_VERSION |
---|
| 44 | mov WORD [bp+IDEPACK.intpack+INTPACK.bx], 0AA55h |
---|
[165] | 45 | mov WORD [bp+IDEPACK.intpack+INTPACK.cx], ENHANCED_DRIVE_ACCESS_SUPPORT |
---|
| 46 | and BYTE [bp+IDEPACK.intpack+INTPACK.flags], ~FLG_FLAGS_CF ; Return with CF cleared |
---|
| 47 | jmp Int13h_ReturnFromHandlerWithoutStoringErrorCode |
---|
| 48 | .EbiosNotSupported: |
---|
[417] | 49 | jmp Int13h_DirectCallToAnotherBios |
---|