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1 | ; $Id: bootsector-empty.asm 62484 2016-07-22 18:35:33Z vboxsync $
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2 | ;; @file
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3 | ; Empty bootsector can be used as example
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4 | ;
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5 |
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6 | ;
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7 | ; Copyright (C) 2012-2016 Oracle Corporation
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8 | ;
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9 | ; This file is part of VirtualBox Open Source Edition (OSE), as
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10 | ; available from http://www.virtualbox.org. This file is free software;
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11 | ; you can redistribute it and/or modify it under the terms of the GNU
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12 | ; General Public License (GPL) as published by the Free Software
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13 | ; Foundation, in version 2 as it comes in the "COPYING" file of the
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14 | ; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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15 | ; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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16 | ;
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17 | ; The contents of this file may alternatively be used under the terms
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18 | ; of the Common Development and Distribution License Version 1.0
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19 | ; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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20 | ; VirtualBox OSE distribution, in which case the provisions of the
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21 | ; CDDL are applicable instead of those of the GPL.
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22 | ;
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23 | ; You may elect to license modified versions of this file under the
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24 | ; terms and conditions of either the GPL or the CDDL or both.
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25 | ;
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26 |
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27 | %include "iprt/asmdefs.mac"
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28 | %include "iprt/x86.mac"
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29 |
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30 |
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31 | ;; The boot sector load address.
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32 | %define BS_ADDR 0x7c00
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33 | %define PDP_ADDR 0x9000
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34 | %define PD_ADDR 0xa000
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35 |
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36 |
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37 | BITS 16
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38 | start:
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39 | ; Start with a jump just to follow the convention.
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40 | jmp short the_code
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41 | nop
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42 | times 3ah db 0
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43 |
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44 | the_code:
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45 | ; put the code here
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46 |
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47 |
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48 |
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49 | hlt_again:
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50 | hlt
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51 | cli
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52 | jmp hlt_again
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53 |
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54 | ;
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55 | ; The GDT.
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56 | ;
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57 | padding:
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58 | times 510 - (padding - start) db 0
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59 | db 055h, 0aah
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60 |
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61 |
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