coreboot-kgpe-d16/util/cbfstool/util.c

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/*
* cbfstool
*
* Copyright (C) 2008 Jordan Crouse <jordan@cosmicpenguin.net>
*
* 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; version 2 of the License.
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
*/
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include "cbfstool.h"
int get_size(const char *size)
{
char *next;
int val = strtoul(size, &next, 0);
/* Support modifiers for the size kK and mM for kbytes and
mbytes respectfully */
if (next != NULL) {
if (*next == 'k' || *next == 'K')
val *= 1024;
else if (*next == 'm' || *next == 'M')
val *= (1024 * 1024);
}
return val;
}
int copy_from_fd(int fd, void *ptr, int size)
{
unsigned char *p = ptr;
while (size > 0) {
int ret = read(fd, p, size);
if (ret == -1) {
ERROR("Error while reading: %m\n");
return -1;
}
if (ret == 0) {
ERROR("Unexpected end of file\n");
return -1;
}
p += ret;
size -= ret;
}
return 0;
}
int size_and_open(const char *filename, unsigned int *size)
{
struct stat s;
int fd = open(filename, O_RDONLY);
if (fd == -1) {
ERROR("Unable to open %s: %m\n", filename);
return -1;
}
if (fstat(fd, &s)) {
ERROR("Unable to stat %s: %m\n", filename);
close(fd);
return -1;
}
*size = s.st_size;
return fd;
}
int map_rom(struct rom *rom, int size)
{
rom->ptr = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED,
rom->fd, 0);
if (rom->ptr == MAP_FAILED) {
ERROR("Could not map the rom: %m\n");
rom->ptr = NULL;
return -1;
}
return 0;
}
int open_rom(struct rom *rom, const char *filename)
{
struct stat s;
unsigned long offset;
if (stat(filename, &s)) {
ERROR("Could not stat %s: %m\n", filename);
return -1;
}
rom->fd = open(filename, O_RDWR);
if (rom->fd == -1) {
ERROR("Could not open %s: %m\n", filename);
rom->fd = 0;
return -1;
}
if (map_rom(rom, s.st_size))
goto err;
/* Find the master header */
offset = ROM_READL(rom, s.st_size - 4);
rom->header = (struct cbfs_header *)
ROM_PTR(rom, s.st_size - (0xFFFFFFFF - offset) - 1);
if (ntohl(rom->header->magic) != HEADER_MAGIC) {
ERROR("This does not appear to be a valid ROM\n");
goto err;
}
/* Check that the alignment is correct */
if (ntohl(rom->header->align) == 0) {
ERROR("The alignment in the ROM is 0 - probably malformed\n");
goto err;
}
/* Sanity check that the size matches the file size */
if (ntohl(rom->header->romsize) != s.st_size) {
ERROR("The ROM size in the header does not match the file\n");
ERROR("ROM size is %d bytes, file size is %d bytes\n",
ntohl(rom->header->romsize), (unsigned int)s.st_size);
goto err;
}
rom->size = ntohl(rom->header->romsize);
rom->fssize = rom->size - ntohl(rom->header->bootblocksize);
return 0;
err:
if (rom->ptr != NULL)
munmap(rom->ptr, s.st_size);
if (rom->fd > 0)
close(rom->fd);
rom->ptr = NULL;
rom->fd = 0;
return -1;
}
int create_rom(struct rom *rom, const unsigned char *filename,
int romsize, const char *bootblockname,
int bootblocksize, int align)
{
unsigned char null = '\0';
if (rom->fd != 0) {
ERROR("%s already exists - cannot create\n", filename);
return -1;
}
/* Remember the size of the entire ROM */
rom->size = romsize;
/* The size of the archive section is everything but the bootblock and
* the cbfs master header. */
rom->fssize = romsize - bootblocksize - sizeof(struct cbfs_header);
/* Open the file descriptor */
rom->fd = open((char *)filename, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR);
if (rom->fd == -1) {
ERROR("Could not create %s: %m\n", filename);
return -1;
}
/* Size the new file appropriately */
lseek(rom->fd, romsize - 1, SEEK_SET);
write(rom->fd, &null, 1);
if (map_rom(rom, romsize)) {
close(rom->fd);
return -1;
}
/* This is a pointer to the header for easy access */
rom->header = (struct cbfs_header *)
ROM_PTR(rom, rom->size - 16 - bootblocksize - sizeof(struct cbfs_header));
rom->header->magic = htonl(HEADER_MAGIC);
rom->header->romsize = htonl(romsize);
rom->header->bootblocksize = htonl(bootblocksize);
rom->header->align = htonl(align);
rom->header->offset = htonl(0);
add_bootblock(rom, bootblockname);
/* Write the cbfs master header address at the end of the ROM. */
ROM_WRITEL(rom, rom->size - 4,
0xFFFFFFF0 - bootblocksize - sizeof(struct cbfs_header));
return 0;
}
int add_bootblock(struct rom *rom, const char *filename)
{
unsigned int size;
int fd = size_and_open(filename, &size);
int ret;
if (fd == -1)
return -1;
if (size > ntohl(rom->header->bootblocksize)) {
ERROR("The bootblock size is not correct (%d vs %d)\n",
size, ntohl(rom->header->bootblocksize));
return -1;
}
/* Copy the bootblock into place at the end of the file */
ret = copy_from_fd(fd, ROM_PTR(rom, rom->size - ntohl(rom->header->bootblocksize)), size);
close(fd);
if (ret) {
ERROR("Unable to add %s to the bootblock\n", filename);
return -1;
}
return 0;
}
int rom_exists(struct rom *rom)
{
if (rom->fd <= 0)
return 0;
return 1;
}