allow ports to override bootelf behavior

[people/ms/u-boot.git] / common / cmd_boot.c

/*
 * (C) Copyright 2000-2003
 * Wolfgang Denk, DENX Software Engineering, wd@denx.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
 */

/*
 * Misc boot support
 */
#include <common.h>
#include <command.h>
#include <net.h>

#if defined(CONFIG_I386)
DECLARE_GLOBAL_DATA_PTR;
#endif

static inline void go_setup(int argc, char *argv[])
{
#if defined(CONFIG_I386)
	/*
	 * x86 does not use a dedicated register to pass the pointer
	 * to the global_data
	 */
	argv[0] = (char *)gd;

#elif defined(CONFIG_BLACKFIN)
	if (dcache_status ())
		dcache_disable ();
	if (icache_status ())
		icache_disable ();
#endif
}

int do_go (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
	ulong	addr, rc;
	int     rcode = 0;

	if (argc < 2) {
		printf ("Usage:\n%s\n", cmdtp->usage);
		return 1;
	}

	addr = simple_strtoul(argv[1], NULL, 16);

	printf ("## Starting application at 0x%08lX ...\n", addr);

	go_setup(argc, argv);

#if defined(CONFIG_NIOS)
	/*
	 * Nios function pointers are address >> 1
	 */
	addr >>= 1;
#endif

	/*
	 * pass address parameter as argv[0] (aka command name),
	 * and all remaining args
	 */
	rc = ((ulong (*)(int, char *[]))addr) (--argc, &argv[1]);
	if (rc != 0) rcode = 1;

	printf ("## Application terminated, rc = 0x%lX\n", rc);
	return rcode;
}

/* -------------------------------------------------------------------- */

U_BOOT_CMD(
	go, CFG_MAXARGS, 1,	do_go,
	"go      - start application at address 'addr'\n",
	"addr [arg ...]\n    - start application at address 'addr'\n"
	"      passing 'arg' as arguments\n"
);

extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);

U_BOOT_CMD(
	reset, 1, 0,	do_reset,
	"reset   - Perform RESET of the CPU\n",
	NULL
);