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/*
* Copyright (C) 2009 Sony Computer Entertainment Inc.
* Copyright 2009 Sony Corp.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#define _GNU_SOURCE
#include <assert.h>
#include <errno.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "log/log.h"
#include <system/system.h>
#include "talloc/talloc.h"
#include "loader.h"
#include "ui-system.h"
/**
* kexec_load - kexec load helper.
* @l_image: The local image file for kexec to execute.
* @l_initrd: Optional local initrd file for kexec --initrd, can be NULL.
* @args: Optional command line args for kexec --append, can be NULL.
*/
static int kexec_load(const char *l_image, const char *l_initrd,
const char *args)
{
int result;
const char *argv[6];
const char **p;
char *s_initrd = NULL;
char *s_args = NULL;
p = argv;
*p++ = pb_system_apps.kexec; /* 1 */
*p++ = "-l"; /* 2 */
if (l_initrd) {
s_initrd = talloc_asprintf(NULL, "--initrd=%s", l_initrd);
assert(s_initrd);
*p++ = s_initrd; /* 3 */
}
if (args) {
s_args = talloc_asprintf(NULL, "--append=%s", args);
assert(s_args);
*p++ = s_args; /* 4 */
}
*p++ = l_image; /* 5 */
*p++ = NULL; /* 6 */
result = pb_run_cmd(argv);
if (result)
pb_log("%s: failed: (%d)\n", __func__, result);
talloc_free(s_initrd);
talloc_free(s_args);
return result;
}
/**
* kexec_reboot - Helper to boot the new kernel.
*
* Must only be called after a successful call to kexec_load().
*/
static int kexec_reboot(void)
{
int result;
const char *argv[4];
const char **p;
/* First try running shutdown. Init scripts should run 'exec -e' */
p = argv;
*p++ = pb_system_apps.shutdown; /* 1 */
*p++ = "-r"; /* 2 */
*p++ = "now"; /* 3 */
*p++ = NULL; /* 4 */
result = pb_run_cmd(argv);
/* On error, force a kexec with the -e option */
if (result) {
p = argv;
*p++ = pb_system_apps.kexec; /* 1 */
*p++ = "-e"; /* 2 */
*p++ = NULL; /* 3 */
result = pb_run_cmd(argv);
}
if (result)
pb_log("%s: failed: (%d)\n", __func__, result);
return result;
}
/**
* pb_run_kexec - Run kexec with the supplied boot options.
*/
int pb_run_kexec(const struct pb_kexec_data *kd)
{
int result;
char *l_image = NULL;
char *l_initrd = NULL;
unsigned int clean_image = 0;
unsigned int clean_initrd = 0;
pb_log("%s: image: '%s'\n", __func__, kd->image);
pb_log("%s: initrd: '%s'\n", __func__, kd->initrd);
pb_log("%s: args: '%s'\n", __func__, kd->args);
result = -1;
if (kd->image) {
l_image = pb_load_file(NULL, kd->image, &clean_image);
if (!l_image)
goto no_load;
}
if (kd->initrd) {
l_initrd = pb_load_file(NULL, kd->initrd, &clean_initrd);
if (!l_initrd)
goto no_load;
}
if (!l_image && !l_initrd)
goto no_load;
result = kexec_load(l_image, l_initrd, kd->args);
no_load:
if (clean_image)
unlink(l_image);
if (clean_initrd)
unlink(l_initrd);
talloc_free(l_image);
talloc_free(l_initrd);
if (!result)
result = kexec_reboot();
return result;
}
/**
* pb_elf_hash - Standard elf hash routine.
*/
unsigned int pb_elf_hash(const char *str)
{
unsigned int h = 0, g;
while (*str) {
h = (h << 4) + *str++;
g = h & 0xf0000000;
if (g)
h ^= g >> 24;
h &= ~g;
}
pb_log("%s: %x\n", __func__, h);
return h;
}
/**
* pb_cat_hash - Hashes concatenation of two strings.
*/
unsigned int pb_cat_hash(const char *a, const char *b)
{
unsigned int h;
char *s;
s = talloc_asprintf(NULL, "%s%s", a, b);
h = pb_elf_hash(s);
talloc_free(s);
return h;
}
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