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| 1 | ; $Id: bootsector-empty.asm 76553 2019-01-01 01:45:53Z 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) 2012-2019 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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