81 lines
2.2 KiB
C
81 lines
2.2 KiB
C
/*
|
|
* bootargs.c - concatenate Linux bootargs
|
|
*
|
|
* Copyright (c) 2012 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
|
|
*
|
|
* See file CREDITS for list of people who contributed to this
|
|
* project.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2
|
|
* as published by the Free Software Foundation.
|
|
*
|
|
* 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.
|
|
*
|
|
*/
|
|
#include <common.h>
|
|
#include <boot.h>
|
|
#include <malloc.h>
|
|
#include <magicvar.h>
|
|
#include <globalvar.h>
|
|
#include <environment.h>
|
|
|
|
static char *linux_bootargs;
|
|
static int linux_bootargs_overwritten;
|
|
|
|
/*
|
|
* This returns the Linux bootargs
|
|
*
|
|
* There are two ways to handle bootargs. The old legacy way is to use the
|
|
* 'bootargs' environment variable. The new and more flexible way is to use
|
|
* global variables beginning with "global.linux.bootargs." and
|
|
* "global.linux.mtdparts.". These variables will be concatenated together to
|
|
* the resulting bootargs. If there are no "global.linux.bootargs." variables
|
|
* we fall back to "bootargs"
|
|
*/
|
|
const char *linux_bootargs_get(void)
|
|
{
|
|
char *bootargs, *mtdparts;
|
|
|
|
if (linux_bootargs_overwritten)
|
|
return linux_bootargs;
|
|
|
|
free(linux_bootargs);
|
|
|
|
bootargs = globalvar_get_match("linux.bootargs.", " ");
|
|
if (!strlen(bootargs))
|
|
return getenv("bootargs");
|
|
|
|
mtdparts = globalvar_get_match("linux.mtdparts.", ";");
|
|
|
|
if (strlen(mtdparts)) {
|
|
linux_bootargs = asprintf("%s mtdparts=%s", bootargs, mtdparts);
|
|
free(bootargs);
|
|
free(mtdparts);
|
|
} else {
|
|
free(mtdparts);
|
|
linux_bootargs = bootargs;
|
|
}
|
|
|
|
return linux_bootargs;
|
|
}
|
|
|
|
int linux_bootargs_overwrite(const char *bootargs)
|
|
{
|
|
if (bootargs) {
|
|
free(linux_bootargs);
|
|
linux_bootargs = xstrdup(bootargs);
|
|
linux_bootargs_overwritten = 1;
|
|
} else {
|
|
linux_bootargs_overwritten = 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
BAREBOX_MAGICVAR_NAMED(global_linux_bootargs_, global.linux.bootargs.*, "Linux bootargs variables");
|
|
BAREBOX_MAGICVAR_NAMED(global_linux_mtdparts_, global.linux.mtdparts.*, "Linux mtdparts variables");
|