89 lines
2.5 KiB
C
89 lines
2.5 KiB
C
/*
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* bootargs.c - concatenate Linux bootargs
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*
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* Copyright (c) 2012 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <common.h>
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#include <boot.h>
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#include <malloc.h>
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#include <magicvar.h>
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#include <globalvar.h>
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#include <environment.h>
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static char *linux_bootargs;
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static int linux_bootargs_overwritten;
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/*
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* This returns the Linux bootargs
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*
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* There are two ways to handle bootargs. The old legacy way is to use the
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* 'bootargs' environment variable. The new and more flexible way is to use
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* global variables beginning with "global.linux.bootargs." and
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* "global.linux.mtdparts.". These variables will be concatenated together to
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* the resulting bootargs. If there are no "global.linux.bootargs." variables
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* we fall back to "bootargs"
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*/
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const char *linux_bootargs_get(void)
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{
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char *bootargs, *parts;
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if (linux_bootargs_overwritten)
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return linux_bootargs;
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free(linux_bootargs);
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bootargs = globalvar_get_match("linux.bootargs.", " ");
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if (!strlen(bootargs))
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return getenv("bootargs");
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linux_bootargs = bootargs;
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parts = globalvar_get_match("linux.mtdparts.", ";");
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if (strlen(parts)) {
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bootargs = asprintf("%s mtdparts=%s", linux_bootargs, parts);
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free(linux_bootargs);
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free(parts);
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linux_bootargs = bootargs;
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}
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parts = globalvar_get_match("linux.blkdevparts.", ";");
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if (strlen(parts)) {
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bootargs = asprintf("%s blkdevparts=%s", linux_bootargs, parts);
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free(linux_bootargs);
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free(parts);
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linux_bootargs = bootargs;
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}
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return linux_bootargs;
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}
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int linux_bootargs_overwrite(const char *bootargs)
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{
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if (bootargs) {
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free(linux_bootargs);
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linux_bootargs = xstrdup(bootargs);
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linux_bootargs_overwritten = 1;
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} else {
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linux_bootargs_overwritten = 0;
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}
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return 0;
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}
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BAREBOX_MAGICVAR_NAMED(global_linux_bootargs_, global.linux.bootargs.*, "Linux bootargs variables");
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BAREBOX_MAGICVAR_NAMED(global_linux_mtdparts_, global.linux.mtdparts.*, "Linux mtdparts variables");
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BAREBOX_MAGICVAR_NAMED(global_linux_blkdevparts_, global.linux.blkdevparts.*, "Linux blkdevparts variables");
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