arch/x86/lib/cmd_boot.c

/*
 * (C) Copyright 2008-2011
 * Graeme Russ, <graeme.russ@gmail.com>
 *
 * (C) Copyright 2002
 * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
 *
 * (C) Copyright 2002
 * Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
 *
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Marius Groeger <mgroeger@sysgo.de>
 *
 * 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 <malloc.h>
#include <asm/u-boot-x86.h>

DECLARE_GLOBAL_DATA_PTR;

unsigned long do_go_exec(ulong (*entry)(int, char * const []),
			 int argc, char * const argv[])
{
	unsigned long ret = 0;
	char **argv_tmp;

	/*
	 * x86 does not use a dedicated register to pass the pointer to
	 * the global_data, so it is instead passed as argv[-1]. By using
	 * argv[-1], the called 'Application' can use the contents of
	 * argv natively. However, to safely use argv[-1] a new copy of
	 * argv is needed with the extra element
	 */
	argv_tmp = malloc(sizeof(char *) * (argc + 1));

	if (argv_tmp) {
		argv_tmp[0] = (char *)gd;

		memcpy(&argv_tmp[1], argv, (size_t)(sizeof(char *) * argc));

		ret = (entry) (argc, &argv_tmp[1]);
		free(argv_tmp);
	}

	return ret;
}