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2005-07-17 Yoshinori Okuji <okuji@enbug.org>

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* conf/i386-pc.rmk (pxeboot_img_LDFLAGS): The text address should
	be 0x7C00 instead of 0x8000.

	* boot/i386/pc/pxeboot.S: Rewritten.

	* kern/i386/pc/startup.S (gate_a20_try_bios): No need to specify
	EXT_C.
	(gate_a20_check_state): Read a byte from 0x108000. Invert the
	result.
This commit is contained in:
okuji 2005-07-16 22:06:33 +00:00
parent 654fc59fe4
commit ebedfd0003
5 changed files with 44 additions and 35 deletions
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37
boot/i386/pc/pxeboot.S
View file

@ -1,7 +1,6 @@
/* -*-Asm-*- */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 1999,2000,2001,2002,2004 Free Software Foundation, Inc.
* Copyright (C) 2000,2005 Free Software Foundation, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -18,26 +17,20 @@
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <grub/boot.h>
#include <grub/machine/boot.h>
/*
* defines for the code go here
*/
.file "pxeboot.S"
.text
/* Tell GAS to generate 16-bit instructions so that this code works
in real mode. */
.code16
.file "pxeboot.S"
.text
/* Start with the prehistoric environment... */
.code16
/* Let's go */
.globl _start; _start:
/*
* _start is loaded at 0x7c00 and is jumped to with CS:IP 0:0x7c00
*/
ljmp $0, $0x8200
. = 0x8000 - 0x7C00 -1
.byte 0
/* Jump to the real world */
ljmp $0, $0x8200
/* This region is a junk. Do you say that this is wasteful?
But I like that the memory layout of the body is consistent
among different kernels rather than scamping just for 1.5KB. */
. = _start + 0x8200 - 0x7C00 - 0x200 - 1
.byte 0