| 1 | ; Project name : XTIDE Universal BIOS
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| 2 | ; Description : Int 19h Handler (Boot Loader).
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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 19h handler that properly reboots the computer when
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| 25 | ; INT 19h is called.
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| 26 | ;
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| 27 | ; Int19hReset_Handler
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| 28 | ; Parameters:
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| 29 | ; Nothing
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| 30 | ; Returns:
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| 31 | ; Never returns (reboots computer)
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| 32 | ;--------------------------------------------------------------------
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| 33 | Int19hReset_Handler:
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| 34 | ; Try to boot from drive A.
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| 35 | ; This is needed if INT 19h is used to launch booter games while
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| 36 | ; preserving interrupt vector table (for example to hook interrupt 10h)
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| 37 | xor dx, dx ; Drive 00h
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| 38 | call BootSector_LoadFirstSectorFromDriveDL
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| 39 | jc SHORT .Reboot
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| 40 |
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| 41 | xor ax, ax
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| 42 | mov ds, ax
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| 43 | %ifdef USE_386
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| 44 | mov fs, ax
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| 45 | mov gs, ax
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| 46 | %endif
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| 47 | cmp WORD [bx+510], 0AA55h ; Valid boot sector?
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| 48 | jne SHORT .Reboot
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| 49 | push es ; Zero
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| 50 | push bx
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| 51 | retf
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| 52 |
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| 53 | ; Do warm reset since boot from floppy drive failed
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| 54 | .Reboot:
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| 55 | mov ax, BOOT_FLAG_WARM ; Skip memory tests
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| 56 | jmp Reboot_ComputerWithBootFlagInAX
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