netbsd/sys/arch/arc/stand/boot/boot.c

/*	$NetBSD: boot.c,v 1.8 2011/02/20 07:52:43 matt Exp $	*/

/*-
 * Copyright (c) 1999 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jonathan Stone, Michael Hitch and Simon Burge.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Ralph Campbell.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)boot.c	8.1 (Berkeley) 6/10/93
 */

#include <lib/libsa/stand.h>
#include <lib/libsa/loadfile.h>
#include <lib/libkern/libkern.h>

#include <sys/param.h>
#include <sys/exec.h>
#include <sys/exec_elf.h>
#include <sys/boot_flag.h>

#include <dev/arcbios/arcbios.h>

#include "common.h"
#include "bootinfo.h"

#ifdef BOOT_DEBUG
#define DPRINTF if (debug) printf
#else
#define DPRINTF while (/*CONSTCOND*/0) printf
#endif

/*
 * We won't go overboard with gzip'd kernel names.  After all we can
 * still boot a gzip'd kernel called "netbsd.arc" - it doesn't need
 * the .gz suffix.
 *
 * For arcane reasons, the first byte of the first element of this struct will
 * contain a zero.  We therefore start from one.
 */

char *kernelnames[] = {
	"placekeeper",
	"netbsd.arc",
	"netbsd",
	"netbsd.gz",
	"netbsd.bak",
	"netbsd.old",
	"onetbsd",
	"gennetbsd",
	NULL
};

static int debug = 0;
static char **environment;

/* Storage must be static. */
struct btinfo_symtab bi_syms;
struct btinfo_bootpath bi_bpath;

static char bootinfo[BOOTINFO_SIZE];

int main(int, char **);
static char *firmware_getenv(char *);

/*
 * This gets arguments from the ARCS monitor, calls ARCS routines to open
 * and load the program to boot, then transfers execution to the new program.
 *
 * argv[0] will be the ARCS path to the bootloader (i.e.,
 * "scsi(0)disk(2)rdisk(0)partition(1)\boot").
 *
 * argv[1] through argv[n] will contain arguments passed from the PROM, if any.
 */

int
main(int argc, char **argv)
{
	const char     *kernel = NULL;
	const char     *bootpath = NULL;
	char            bootfile[PATH_MAX];
	void            (*entry)(int, char *[], u_int, void *);
	u_long          marks[MARK_MAX];
	int             win = 0;
	int             i;
	int             ch;

	/* print a banner */
	printf("\n");
	printf("%s Bootstrap, Revision %s\n", bootprog_name, bootprog_rev);

	memset(marks, 0, sizeof marks);

	/* initialise bootinfo structure early */
	bi_init(bootinfo);

#ifdef BOOT_DEBUG
	for (i = 0; i < argc; i++)
		printf("argv[%d] = %s\n", i, argv[i]);
#endif

	/* Parse arguments, if present.  */
	while ((ch = getopt(argc, argv, "v")) != -1) {
		switch (ch) {
		case 'v':
			debug = 1;
			break;
		}
	}

	environment = &argv[1];

	bootpath = firmware_getenv("OSLoadPartition");
	if (bootpath == NULL)
		bootpath =
		    arcbios_GetEnvironmentVariable("OSLoadPartition");

	if (bootpath == NULL) {
		/* XXX need to actually do the fixup */
		printf("OSLoadPartition is not specified.\n");
		return 0;
	}
	DPRINTF("bootpath = %s\n", bootpath);

	/*
	 * Grab OSLoadFilename from ARCS.
	 */

	kernel = firmware_getenv("OSLoadFilename");
	if (kernel == NULL)
		kernel = arcbios_GetEnvironmentVariable("OSLoadFilename");

	DPRINTF("kernel = %s\n", kernel ? kernel : "<null>");

	/*
	 * The first arg is assumed to contain the name of the kernel to boot,
	 * if it a) does not start with a hyphen and b) does not contain
	 * an equals sign.
	 */

	for (i = 1; i < argc; i++) {
		if (((strchr(argv[i], '=')) == NULL) && (argv[i][0] != '-')) {
			kernel = argv[i];
			break;
		}
	}

	if (kernel != NULL) {
		/*
		 * if the name contains parenthesis, we assume that it
		 * contains the bootpath and ignore anything passed through
		 * the environment
		 */
		if (strchr(kernel, '('))
			win = loadfile(kernel, marks, LOAD_KERNEL);
		else {
			strcpy(bootfile, bootpath);
			strcat(bootfile, kernel);
			win = loadfile(bootfile, marks, LOAD_KERNEL);
		}

	} else {
		i = 1;
		while (kernelnames[i] != NULL) {
			strcpy(bootfile, bootpath);
			strcat(bootfile, kernelnames[i]);
			kernel = kernelnames[i];
			win = loadfile(bootfile, marks, LOAD_KERNEL);
			if (win != -1)
				break;
			i++;
		}

	}

	if (win < 0) {
		printf("Boot failed!  Halting...\n");
		(void)getchar();
		return 0;
	}

	strlcpy(bi_bpath.bootpath, kernel, BTINFO_BOOTPATH_LEN);
	bi_add(&bi_bpath, BTINFO_BOOTPATH, sizeof(bi_bpath));

	bi_syms.nsym = marks[MARK_NSYM];
	bi_syms.ssym = marks[MARK_SYM];
	bi_syms.esym = marks[MARK_END];
	bi_add(&bi_syms, BTINFO_SYMTAB, sizeof(bi_syms));

	entry = (void *)marks[MARK_ENTRY];

	if (debug) {
		printf("Starting at %p\n\n", entry);
		printf("nsym 0x%lx ssym 0x%lx esym 0x%lx\n", marks[MARK_NSYM],
		       marks[MARK_SYM], marks[MARK_END]);
	}
	(*entry)(argc, argv, BOOTINFO_MAGIC, bootinfo);

	printf("Kernel returned!  Halting...\n");
	return 0;
}

char *
firmware_getenv(char *envname)
{
	char **env;
	int len;

	len = strlen(envname);

	for (env = environment; env[0]; env++) {
		if (strncasecmp(envname, env[0], len) == 0 &&
		    env[0][len] == '=') {
			return &env[0][len + 1];
		}
	}
	return NULL;
}

void
_rtt(void)
{

	arcbios_Halt();
}