/* ----------------------------------------------------------------------- *
*
* Copyright 2007-2008 H. Peter Anvin - All Rights Reserved
* Copyright 2009 Intel Corporation; author: H. Peter Anvin
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall
* be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* ----------------------------------------------------------------------- */
/*
* linux.c
*
* Sample module to load Linux kernels. This module can also create
* a file out of the DHCP return data if running under PXELINUX.
*
* If -dhcpinfo is specified, the DHCP info is written into the file
* /dhcpinfo.dat in the initramfs.
*
* Usage: linux.c32 [-dhcpinfo] kernel arguments...
*/
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <console.h>
#include <syslinux/loadfile.h>
#include <syslinux/linux.h>
#include <syslinux/pxe.h>
const char *progname = "linux.c32";
/* Find the last instance of a particular command line argument
(which should include the final =; do not use for boolean arguments) */
static char *find_argument(char **argv, const char *argument)
{
int la = strlen(argument);
char **arg;
char *ptr = NULL;
for (arg = argv; *arg; arg++) {
if (!memcmp(*arg, argument, la))
ptr = *arg + la;
}
return ptr;
}
/* Search for a boolean argument; return its position, or 0 if not present */
static int find_boolean(char **argv, const char *argument)
{
char **arg;
for (arg = argv; *arg; arg++) {
if (!strcmp(*arg, argument))
return (arg - argv) + 1;
}
return 0;
}
/* Stitch together the command line from a set of argv's */
static char *make_cmdline(char **argv)
{
char **arg;
size_t bytes;
char *cmdline, *p;
bytes = 1; /* Just in case we have a zero-entry cmdline */
for (arg = argv; *arg; arg++) {
bytes += strlen(*arg) + 1;
}
p = cmdline = malloc(bytes);
if (!cmdline)
return NULL;
for (arg = argv; *arg; arg++) {
int len = strlen(*arg);
memcpy(p, *arg, len);
p[len] = ' ';
p += len + 1;
}
if (p > cmdline)
p--; /* Remove the last space */
*p = '\0';
return cmdline;
}
int main(int argc, char *argv[])
{
const char *kernel_name;
struct initramfs *initramfs;
char *cmdline;
char *boot_image;
void *kernel_data;
size_t kernel_len;
bool opt_dhcpinfo = false;
bool opt_quiet = false;
void *dhcpdata;
size_t dhcplen;
char **argp, *arg, *p;
openconsole(&dev_null_r, &dev_stdcon_w);
(void)argc;
argp = argv + 1;
while ((arg = *argp) && arg[0] == '-') {
if (!strcmp("-dhcpinfo", arg)) {
opt_dhcpinfo = true;
} else {
fprintf(stderr, "%s: unknown option: %s\n", progname, arg);
return 1;
}
argp++;
}
if (!arg) {
fprintf(stderr, "%s: missing kernel name\n", progname);
return 1;
}
kernel_name = arg;
boot_image = malloc(strlen(kernel_name) + 12);
if (!boot_image)
goto bail;
strcpy(boot_image, "BOOT_IMAGE=");
strcpy(boot_image + 11, kernel_name);
/* argp now points to the kernel name, and the command line follows.
Overwrite the kernel name with the BOOT_IMAGE= argument, and thus
we have the final argument. */
*argp = boot_image;
if (find_boolean(argp, "quiet"))
opt_quiet = true;
if (!opt_quiet)
printf("Loading %s... ", kernel_name);
if (loadfile(kernel_name, &kernel_data, &kernel_len)) {
if (opt_quiet)
printf("Loading %s ", kernel_name);
printf("failed!\n");
goto bail;
}
if (!opt_quiet)
printf("ok\n");
cmdline = make_cmdline(argp);
if (!cmdline)
goto bail;
/* Initialize the initramfs chain */
initramfs = initramfs_init();
if (!initramfs)
goto bail;
if ((arg = find_argument(argp, "initrd="))) {
do {
p = strchr(arg, ',');
if (p)
*p = '\0';
if (!opt_quiet)
printf("Loading %s... ", arg);
if (initramfs_load_archive(initramfs, arg)) {
if (opt_quiet)
printf("Loading %s ", kernel_name);
printf("failed!\n");
goto bail;
}
if (!opt_quiet)
printf("ok\n");
if (p)
*p++ = ',';
} while ((arg = p));
}
/* Append the DHCP info */
if (opt_dhcpinfo &&
!pxe_get_cached_info(PXENV_PACKET_TYPE_DHCP_ACK, &dhcpdata, &dhcplen)) {
if (initramfs_add_file(initramfs, dhcpdata, dhcplen, dhcplen,
"/dhcpinfo.dat", 0, 0755))
goto bail;
}
/* This should not return... */
syslinux_boot_linux(kernel_data, kernel_len, initramfs, cmdline);
bail:
fprintf(stderr, "Kernel load failure (insufficient memory?)\n");
return 1;
}
