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/*
* buildimage.c
*
* Takes the memory image of a loaded kernel and modules and repackages
* it as a linux bzImage
*
* Copyright (C) 2003-2004 Tim Deegan (tjd21@cl.cam.ac.uk)
*
* 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 the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*
* $Id: buildimage.c,v 1.2 2005/03/23 10:39:19 tjd21 Exp $
*
*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <getopt.h>
#include <elf.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <asm/page.h>
#include "mbootpack.h"
#include "mb_header.h"
/* We will build an image that a bzImage-capable bootloader will load like
* this:
*
* ============== (0)
* (BIOS memory)
* --------------
* (Bootloader)
* --------------
* bzImage startup code
* MBI, command-lines, module info
* ============== (0xa0000)
* (memory hole)
* ============== (0x100000)
* Kernel and modules
* ==============
*
* The bzImage startup code is mostly taken straight from the linux kernel
* (see bootsect.S, startup.S). It does the usual unpleasant start-of-day
* tasks to get to 32-bit protected mode, then sets registers appropriately
* and jumps to the kernel's entry address.
*
* It also does some relocation to make sure the MBI is where we expect it,
* and parses the linux command line.
*/
#define BZ_SETUP_OFFSET (512 * (1 + SETUPSECTS))
#define BZ_ENTRY_OFFSET 0x30
#define BZ_MBI_OFFSET 0x34
/* These *MUST* fit the offsets of entry_address and mbi_address in setup.S */
/* Bring in the bzImage boot sector and setup code */
#include "bzimage_header.c"
address_t place_mbi(long int size)
/* Find space at the top of *low* memory for the MBI and associated red tape */
{
address_t start;
start = 0xa000 - size;
if (start < 0x9000 + sizeof(bzimage_bootsect) + sizeof(bzimage_setup)) {
printf("Fatal: command-lines too long: need %i, have %i bytes\n",
size,
0x1000 - (sizeof(bzimage_bootsect) + sizeof(bzimage_setup)));
exit(1);
}
if (!quiet) {
printf("Placed MBI and strings (%p+%p)\n",
start, size);
}
return start;
}
void make_bzImage(section_t *sections,
address_t entry,
address_t mbi,
FILE *fp)
/* Rework this list of sections into a bzImage and write it out to fp */
{
int i;
size_t offset;
section_t *s;
/* Patch the kernel and mbi addresses into the setup code */
*(address_t *)(bzimage_setup + BZ_ENTRY_OFFSET) = eswap(entry);
*(address_t *)(bzimage_setup + BZ_MBI_OFFSET) = eswap(mbi);
if (!quiet) printf("Kernel entry is %p, MBI is %p.\n", entry, mbi);
/* Write out header and trampoline */
if (fseek(fp, 0, SEEK_SET) < 0) {
printf("Fatal: error seeking in output file: %s\n",
strerror(errno));
exit(1);
}
if (fwrite(bzimage_bootsect, sizeof(bzimage_bootsect), 1, fp) != 1) {
printf("Fatal: error writing to output file: %s\n",
strerror(errno));
exit(1);
}
if (fwrite(bzimage_setup, sizeof(bzimage_setup), 1, fp) != 1) {
printf("Fatal: error writing to output file: %s\n",
strerror(errno));
exit(1);
}
if (!quiet) printf("Wrote bzImage header: %i + %i bytes.\n",
sizeof(bzimage_bootsect), sizeof(bzimage_setup));
/* Sorted list of sections below 1MB: write them out */
for (s = sections, i = 0; s; s = s->next) {
if (s->start >= HIGHMEM_START) continue;
offset = (s->start - 0x9000);
if (fseek(fp, offset, SEEK_SET) < 0) {
printf("Fatal: error seeking in output file: %s\n",
strerror(errno));
exit(1);
}
if (fwrite(s->buffer, s->size, 1, fp) != 1) {
printf("Fatal: error writing to output file: %s\n",
strerror(errno));
exit(1);
}
i++;
}
if (!quiet) printf("Wrote %i low-memory sections.\n", i);
/* Sorted list of sections higher than 1MB: write them out */
for (s = sections, i = 0; s; s = s->next) {
if (s->start < HIGHMEM_START) continue;
offset = (s->start - HIGHMEM_START) + BZ_SETUP_OFFSET;
if (fseek(fp, offset, SEEK_SET) < 0) {
printf("Fatal: error seeking in output file: %s\n",
strerror(errno));
exit(1);
}
if (fwrite(s->buffer, s->size, 1, fp) != 1) {
printf("Fatal: error writing to output file: %s\n",
strerror(errno));
exit(1);
}
i++;
}
if (!quiet) printf("Wrote %i high-memory sections.\n", i);
}
/*
* EOF(buildimage.c)
*/
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