usr/src/grub/grub-0.97/stage2/pxeloader.S
author Christopher Siden <chris.siden@delphix.com>
Mon, 21 May 2012 12:11:39 -0700
changeset 13700 2889e2596bd6
parent 8044 b3af80bbf173
permissions -rw-r--r--
2619 asynchronous destruction of ZFS file systems 2747 SPA versioning with zfs feature flags Reviewed by: Matt Ahrens <[email protected]> Reviewed by: George Wilson <[email protected]> Reviewed by: Richard Lowe <[email protected]> Reviewed by: Dan Kruchinin <[email protected]> Approved by: Eric Schrock <[email protected]>
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/*
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 *  GRUB  --  GRand Unified Bootloader
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 *  Copyright (C) 2000   Free Software Foundation, Inc.
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 *
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 *  This program is free software; you can redistribute it and/or modify
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 *  it under the terms of the GNU General Public License as published by
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 *  the Free Software Foundation; either version 2 of the License, or
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 *  (at your option) any later version.
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 *
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 *  This program is distributed in the hope that it will be useful,
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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *  GNU General Public License for more details.
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 *
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 *  You should have received a copy of the GNU General Public License
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 *  along with this program; if not, write to the Free Software
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 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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 */
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	.file	"pxeloader.S"
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	.text
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	/* Start with the prehistoric environment... */
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	.code16
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	/* Let's go */
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.globl _start; _start:
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	movw	%sp, %bp
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	movw	%ss:4(%bp), %ax
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	pushw	%ax
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	movw	%ss:6(%bp), %ax
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	pushw	%ax
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	call	1f
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1:	popw	%bx
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	/* Save !PXE address */
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	popw	%ax
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	movw	%ax, %cs:(pxeseg-1b)(%bx)
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	popw	%ax
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	movw	%ax, %cs:(pxeoff-1b)(%bx)
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	movw	%ax, %bx
0
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	/* Jump to the real world */
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	ljmp	$0, $0x8200
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	. = _start + 0x7C80 - 0x7C00
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pxeseg:	.word	0
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pxeoff:	.word	0
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0
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	/* This region is a junk. Do you say that this is wasteful?
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	   But I like that the memory layout of the body is consistent
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	   among different stage2s rather than scamping just for 1.5KB. */
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	. = _start + 0x8200 - 0x7C00 - 1
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	.byte	0