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Always jump to the physical entry address of a Multiboot OS image, even

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when the physical one differs from the virtual one.
This commit is contained in:
okuji 2001-06-19 11:31:15 +00:00
parent 247a4c4a73
commit 123b813394
4 changed files with 33 additions and 4 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
2001-06-19 OKUJI Yoshinori <okuji@gnu.org>
* stage2/boot.c (load_image): If the image is a Multiboot ELF OS
image, get the physical entry address, when a loaded memory
segment contains it. And, set ENTRY_ADDR to it, after printing
out the virtual one. Suggested by Rogelio M. Serrano Jr.
<rogelio@victorio.com>.
2001-05-30 OKUJI Yoshinori <okuji@gnu.org>
* docs/grub.texi: Fix some typos. Reported by Florian Hatat

3
NEWS
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@ -29,6 +29,9 @@ New in 1.0 - XXXX-XX-XX:
* The configure script now accepts `--disable-auto-linux-mem-opt', which
has the same meaning as you specify the option `--no-mem-option' to the
command "kernel".
* Jump to the physical entry address of a Multiboot kernel when booting
it up. The old behavior was to use the virtual one, regardless of the
setting of the physical address.
New in 0.5.96 - 2000-10-04:
* New commands, "reboot" and "halt".

1
THANKS
View file

@ -62,6 +62,7 @@ Peter Astrand <altic@lysator.liu.se>
Ralf Medow <ralf.medow@t-online.de>
Ramon van Handel <vhandel@chem.vu.nl>
Roderich Schupp <rsch@ExperTeam.de>
Rogelio M. Serrano Jr. <rogelio@victorio.com>
Stefan Ondrejicka <ondrej@idata.sk>
Stephen Early <steve@greenend.org.uk>
Takehiro Suzuki <takehiro@coral.ocn.ne.jp>

25
stage2/boot.c
View file

@ -2,7 +2,7 @@
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 1996 Erich Boleyn <erich@uruk.org>
* Copyright (C) 1999, 2000 Free Software Foundation, Inc.
* Copyright (C) 1999, 2000, 2001 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
@ -42,6 +42,7 @@ load_image (char *kernel, char *arg, kernel_t suggested_type,
unsigned long load_flags)
{
int len, i, exec_type = 0, align_4k = 1;
entry_func real_entry_addr = 0;
kernel_t type = KERNEL_TYPE_NONE;
unsigned long flags = 0, text_len = 0, data_len = 0, bss_len = 0;
char *str = 0, *str2 = 0;
@ -493,7 +494,7 @@ load_image (char *kernel, char *arg, kernel_t suggested_type,
else
/* ELF executable */
{
int loaded = 0, memaddr, memsiz, filesiz;
unsigned loaded = 0, memaddr, memsiz, filesiz;
Elf32_Phdr *phdr;
/* reset this to zero for now */
@ -519,6 +520,15 @@ load_image (char *kernel, char *arg, kernel_t suggested_type,
memsiz = phdr->p_memsz;
if (memaddr < RAW_ADDR (0x100000))
errnum = ERR_BELOW_1MB;
/* If the memory range contains the entry address, get the
physical address here. */
if (type == KERNEL_TYPE_MULTIBOOT
&& (unsigned) entry_addr >= phdr->p_vaddr
&& (unsigned) entry_addr < phdr->p_vaddr + memsiz)
real_entry_addr = (entry_func) ((unsigned) entry_addr
+ memaddr - phdr->p_vaddr);
/* make sure we only load what we're supposed to! */
if (filesiz > memsiz)
filesiz = memsiz;
@ -553,8 +563,15 @@ load_image (char *kernel, char *arg, kernel_t suggested_type,
}
}
if (!errnum)
printf (", entry=0x%x]\n", (int) entry_addr);
if (! errnum)
{
grub_printf (", entry=0x%x]\n", (unsigned) entry_addr);
/* If the entry address is physically different from that of the ELF
header, correct it here. */
if (real_entry_addr)
entry_addr = real_entry_addr;
}
else
{
putchar ('\n');