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// SPDX-License-Identifier: GPL-2.0-only
/*
* bootargs.c - concatenate Linux bootargs
*
* Copyright (c) 2012 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
*/
#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, *parts;
if (linux_bootargs_overwritten)
return linux_bootargs;
free(linux_bootargs);
bootargs = globalvar_get_match("linux.bootargs.", " ");
if (!strlen(bootargs))
return getenv("bootargs");
linux_bootargs = bootargs;
parts = globalvar_get_match("linux.mtdparts.", ";");
if (strlen(parts)) {
bootargs = basprintf("%s mtdparts=%s", linux_bootargs,
parts);
free(linux_bootargs);
linux_bootargs = bootargs;
}
free(parts);
parts = globalvar_get_match("linux.blkdevparts.", ";");
if (strlen(parts)) {
bootargs = basprintf("%s blkdevparts=%s", linux_bootargs,
parts);
free(linux_bootargs);
linux_bootargs = bootargs;
}
free(parts);
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(global.linux.bootargs.*, "Linux bootargs variables");
BAREBOX_MAGICVAR(global.linux.mtdparts.*, "Linux mtdparts variables");
BAREBOX_MAGICVAR(global.linux.blkdevparts.*, "Linux blkdevparts variables");
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