| 1 | ; Project name : XTIDE Universal BIOS
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| 2 | ; Description : Functions for accessings BOOTVARS.
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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 | ; BootVars_Initialize
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| 25 | ; Parameters:
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| 26 | ; DS: RAMVARS Segment
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| 27 | ; ES: BDA Segment
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| 28 | ; Returns:
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| 29 | ; Nothing
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| 30 | ; Corrupts registers:
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| 31 | ; AX, CX, DX, DI
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| 32 | ;--------------------------------------------------------------------
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| 33 | BootVars_Initialize:
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| 34 | ; Clear all DRVDETECTINFO structs to zero
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| 35 | mov al, DRVDETECTINFO_size
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| 36 | mul BYTE [cs:ROMVARS.bIdeCnt]
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| 37 | xchg cx, ax
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| 38 | %ifndef MODULE_HOTKEYS
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| 39 | mov di, BOOTVARS.rgDrvDetectInfo ; We must not initialize anything before this!
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| 40 | jmp Memory_ZeroESDIwithSizeInCX
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| 41 |
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| 42 | %else ; if MODULE_HOTKEYS
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| 43 | ; Also zero HOTKEYVARS located above DRVDETECTINFO structs
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| 44 | mov di, BOOTVARS.hotkeyVars
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| 45 | add cx, BYTE HOTKEYVARS_size
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| 46 | call Memory_ZeroESDIwithSizeInCX
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| 47 | jmp HotkeyBar_InitializeVariables
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| 48 | %endif ; MODULE_HOTKEYS
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| 49 |
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| 50 |
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| 51 | ;--------------------------------------------------------------------
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| 52 | ; Returns letter for first hard disk. Usually it will be 'C' but it
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| 53 | ; can be higher if more than two floppy drives are found.
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| 54 | ;
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| 55 | ; BootVars_GetLetterForFirstHardDriveToAX
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| 56 | ; Parameters:
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| 57 | ; DS: RAMVARS segment
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| 58 | ; Returns:
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| 59 | ; AX: Upper case letter for first hard disk
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| 60 | ; Corrupts registers:
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| 61 | ; Nothing
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| 62 | ;--------------------------------------------------------------------
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| 63 | BootVars_GetLetterForFirstHardDriveToAX:
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| 64 | call FloppyDrive_GetCountToAX
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| 65 | add al, DEFAULT_FLOPPY_DRIVE_LETTER ; First Hard Drive letter comes after last floppy drive letter...
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| 66 | MAX_U al, DEFAULT_HARD_DRIVE_LETTER ; ...but it can never be 'A' or 'B'
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| 67 | ret
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