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 | cmp WORD [bx+510], 0AA55h ; Valid boot sector? |
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41 | je SHORT Int19h_JumpToBootSectorInESBXOrRomBootWithoutStackChange |
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42 | |
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43 | ; Do warm reset since boot from floppy drive failed |
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44 | .Reboot: |
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45 | mov ax, BOOT_FLAG_WARM ; Skip memory tests |
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46 | jmp Reboot_ComputerWithBootFlagInAX |
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