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/*
* This file has been modified for the cdrkit suite.
*
* The behaviour and appearence of the program code below can differ to a major
* extent from the version distributed by the original author(s).
*
* For details, see Changelog file distributed with the cdrkit package. If you
* received this file from another source then ask the distributing person for
* a log of modifications.
*
*/
/*
* Program boot-alpha.c - Handle Linux alpha boot extensions to iso9660.
*
* Written by Steve McIntyre <steve@einval.com> June 2004
*
* Heavily inspired by isomarkboot by David Mosberger in 1996.
*
* Copyright 2004 Steve McIntyre
*
* 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, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <mconfig.h>
#include "genisoimage.h"
#include <fctldefs.h>
#include <utypes.h>
#include <intcvt.h>
#include "match.h"
#include "diskmbr.h"
#include "bootinfo.h"
#include <schily.h>
#include "endianconv.h"
int add_boot_alpha_filename(char *filename);
static int boot_alpha_write(FILE *outfile);
static int boot_alpha_hppa_write(FILE *outfile);
static char *boot_file_name = NULL;
unsigned long long alpha_hppa_boot_sector[256]; /* One (ISO) sector */
int boot_sector_initialized = 0;
#define BOOT_STRING "Linux/Alpha aboot for ISO filesystem."
/* Simple function: store the filename to be used later when we need
to find the boot file */
extern int add_boot_alpha_filename(char *filename)
{
boot_file_name = filename;
return 0;
}
static int boot_alpha_write(FILE *outfile)
{
struct directory_entry *boot_file; /* Boot file we need to search for */
unsigned long length = 0;
unsigned long extent = 0;
if (!boot_sector_initialized) {
memset(alpha_hppa_boot_sector, 0, sizeof(alpha_hppa_boot_sector));
boot_sector_initialized = 1;
}
/* Write the text header into the boot sector */
strcpy((char *)alpha_hppa_boot_sector, BOOT_STRING);
/* Find the dir entry for the boot file by walking our file list */
boot_file = search_tree_file(root, boot_file_name);
if (!boot_file) {
#ifdef USE_LIBSCHILY
comerrno(EX_BAD, "Uh oh, I cant find the Alpha boot file '%s'!\n",
boot_file_name);
#else
fprintf(stderr, "Uh oh, I cant find the Alpha boot file '%s'!\n",
boot_file_name);
exit(1);
#endif
}
/* Grab the ISO start sector and length from the dir entry. ISO
uses 2048-byte sectors, but we convert to 512-byte sectors here
for the sake of the firmware */
extent = get_733(boot_file->isorec.extent);
extent *= 4;
length = get_733(boot_file->isorec.size);
length /= 512; /* I'm sure we should take account of any overlap
here, but I'm copying what isomarkboot
does. Maybe the boot files are specified to be
exact multiples of 512 bytes? */
fprintf(stderr, "Found alpha boot image %s: using extent %lu, #blocks %lu\n",
boot_file_name, extent, length);
/* Now write those values into the appropriate area of the boot
sector in LITTLE ENDIAN format. */
write_le64(length, (unsigned char *)&alpha_hppa_boot_sector[60]);
write_le64(extent, (unsigned char *)&alpha_hppa_boot_sector[61]);
return 0;
}
static int boot_alpha_hppa_write(FILE *outfile)
{
unsigned long long sum = 0;
int i = 0;
/* Now generate a checksum of the first 504 bytes of the boot
sector and place it in alpha_hppa_boot_sector[63]. Isomarkboot currently
gets this wrong and will not work on big-endian systems! */
for (i = 0; i < 63; i++)
sum += read_le64((unsigned char *)&alpha_hppa_boot_sector[i]);
write_le64(sum, (unsigned char *)&alpha_hppa_boot_sector[63]);
jtwrite(alpha_hppa_boot_sector, sizeof(alpha_hppa_boot_sector), 1, 0, FALSE);
xfwrite(alpha_hppa_boot_sector, sizeof(alpha_hppa_boot_sector), 1, outfile, 0, FALSE);
last_extent_written++;
return 0;
}
struct output_fragment alphaboot_desc = {NULL, NULL, NULL, boot_alpha_write, "alpha boot block"};
struct output_fragment alpha_hppa_boot_desc = {NULL, oneblock_size, NULL, boot_alpha_hppa_write, "alpha/hppa boot block"};
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