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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"
/**
* run_kexec_local - Final kexec 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 run_kexec_local(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 */
if (l_initrd) {
s_initrd = talloc_asprintf(NULL, "--initrd=%s", l_initrd);
assert(s_initrd);
*p++ = s_initrd; /* 2 */
}
if (args) {
s_args = talloc_asprintf(NULL, "--append=%s", args);
assert(s_args);
*p++ = s_args; /* 3 */
}
/* First try by telling kexec to run shutdown */
*(p + 0) = l_image;
*(p + 1) = NULL;
result = pb_run_cmd(argv);
/* kexec will return zero on success */
/* On error, force a kexec with the -f option */
if (result) {
*(p + 0) = "-f"; /* 4 */
*(p + 1) = l_image; /* 5 */
*(p + 2) = 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;
}
/**
* pb_run_kexec - Run kexec with the supplied boot options.
*
* For the convenience of the user, tries to load both files before
* returning error.
*/
int pb_run_kexec(const struct pb_kexec_data *kd)
{
int result;
char *l_image;
char *l_initrd;
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);
if (kd->image)
l_image = pb_load_file(NULL, kd->image);
else {
l_image = NULL;
pb_log("%s: error null image\n", __func__);
}
l_initrd = kd->initrd ? pb_load_file(NULL, kd->initrd) : NULL;
if (!l_image || (kd->initrd && !l_initrd))
result = -1;
else
result = run_kexec_local(l_image, l_initrd, kd->args);
talloc_free(l_image);
talloc_free(l_initrd);
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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