arch/nios2/lib/bootm.c

/*
 * barebox - bootm.c
 *
 * (C) Copyright 2011 - Franck JULLIEN <elec4fun@gmail.com>
 *
 * (C) Copyright 2003, Psyent Corporation <www.psyent.com>
 * Scott McNutt <smcnutt@psyent.com>
 *
 * 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 as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * 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
 */

#include <common.h>
#include <command.h>
#include <image.h>
#include <environment.h>
#include <init.h>
#include <boot.h>
#include <asm/cache.h>

#define NIOS_MAGIC 0x534f494e /* enable command line and initrd passing */

static int do_bootm_linux(struct image_data *idata)
{
	image_header_t *os_header = &idata->os->header;
	void (*kernel)(int, int, int, const char *);
	const char *commandline = getenv ("bootargs");

	kernel = (void (*)(int, int, int, const char *))ntohl(os_header->ih_ep);

#ifdef CONFIG_USE_IRQ
	disable_interrupts();
#endif

	if (relocate_image(idata->os, (void *)ntohl(os_header->ih_load)))
		return -1;

	/* kernel parameters passing
	 * r4 : NIOS magic
	 * r5 : initrd start
	 * r6 : initrd end or fdt
	 * r7 : kernel command line
	 * fdt is passed to kernel via r6, the same as initrd_end. fdt will be
	 * verified with fdt magic. when both initrd and fdt are used at the
	 * same time, fdt must follow immediately after initrd.
	 */

	/* flushes data and instruction caches before calling the kernel */
	flush_cache_all();

	kernel(NIOS_MAGIC, 0, 0, commandline);
	/* does not return */

	return 1;
}

static struct image_handler handler = {
	.bootm = do_bootm_linux,
	.image_type = IH_OS_LINUX,
};

int nios2_register_image_handler(void)
{
	return register_image_handler(&handler);
}

late_initcall(nios2_register_image_handler);