main.c

MIPS处理器的bootloader,龙芯就是用的修改过的PMON2

/*	$OpenBSD: main.c,v 1.20 2000/01/04 14:23:43 angelos Exp $	*/
/*	$NetBSD: main.c,v 1.22 1997/02/02 21:12:33 thorpej Exp $	*/

/*
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This software was developed by the Computer Systems Engineering group
 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
 * contributed to Berkeley.
 *
 * All advertising materials mentioning features or use of this software
 * must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Lawrence Berkeley Laboratories.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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.
 *
 *	from: @(#)main.c	8.1 (Berkeley) 6/6/93
 */

#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1992, 1993\n\
	The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "config.h"
#include "common.h"

int	firstfile(const char *);
int	yyparse(void);

extern char *optarg;
extern int optind;

static struct hashtab *mkopttab;
static struct nvlist **nextopt;
static struct nvlist **nextdefopt;
static struct nvlist **nextmkopt;

static __dead void stop(void);
static int do_option(struct hashtab *, struct nvlist ***,
			const char *, const char *, const char *);
static int crosscheck(void);
static int badstar(void);
static int mksymlinks(void);
static int hasparent(struct devi *);
static int cfcrosscheck(struct config *, const char *, struct nvlist *);
static void optiondelta(void);

int	madedir = 0;

void
usage(char *progname)
{
	fprintf(stderr, "usage: %s [-s srcdir] [-b builddir] [sysname]\n",
	    progname);
	exit(1);
}

int
main(argc, argv)
	int argc;
	char **argv;
{
	register char *p;
	const char *last_component;
	int ch;

	while ((ch = getopt(argc, argv, "b:s")) != -1) {
		switch (ch) {

		case 'b':
			builddir = optarg;
			break;

		case 's':
			srcdir = optarg;
			break;

		case '?':
		default:
			usage(argv[0]);
		}
	}

	argc -= optind;
	argv += optind;
	if (argc > 1)
		usage(argv[0]);

	conffile = (argc == 1) ? argv[0] : "CONFIG";
	if (firstfile(conffile)) {
		(void)fprintf(stderr, "config: cannot read %s: %s\n",
		    conffile, strerror(errno));
		exit(2);
	}

	/*
	 * Init variables.
	 */
	initintern();
	initfiles();
	initsem();
	devbasetab = ht_new();
	devatab = ht_new();
	selecttab = ht_new();
	needcnttab = ht_new();
	opttab = ht_new();
	mkopttab = ht_new();
	defopttab = ht_new();
	nextopt = &options;
	nextmkopt = &mkoptions;
	nextdefopt = &defoptions;

	/*
	 * Handle profiling (must do this before we try to create any
	 * files).
	 */
	last_component = strrchr(conffile, '/');
	last_component = (last_component) ? last_component + 1 : conffile;
	p = emalloc(strlen(last_component) + 13);
	(void)sprintf(p, "../compile/%s", last_component);
	defbuilddir = (argc == 0) ? "." : p;

	/*
	 * Parse config file (including machine definitions).
	 */
	if (yyparse())
		stop();

	/*
	 * Fix (as in `set firmly in place') files.
	 */
	if (fixfiles())
		stop();

	/*
	 * Fix objects and libraries.
	 */
	if (fixobjects())
		stop();

	if (crosscheck() || errors)
		stop();

	/*
	 * Squeeze things down and finish cross-checks (STAR checks must
	 * run after packing).
	 */
	pack();
	if (badstar())
		stop();

	/*
	 * Ready to go.  Build all the various files.
	 */
	if (mksymlinks() || mkmakefile() || mkheaders() || mkioconf())
		stop();
	(void)printf("Don't forget to run \"make depend\"\n");
	optiondelta();
	exit(0);
}

/*
 * Make a symlink for "machine" so that "#include <machine/foo.h>" works,
 * and for the machine's CPU architecture, so that works as well.
 */
static int
mksymlinks()
{
	int ret;
	char *p, buf[MAXPATHLEN];
	const char *q;

	sprintf(buf, "Targets/%s/include", machine);
	p = sourcepath(buf);
	(void)unlink("target");
	ret = symlink(p, "target");
	if (ret)
		(void)fprintf(stderr, "config: symlink(target -> %s): %s\n",
		    p, strerror(errno));

	if (machinearch != NULL) {
		sprintf(buf, "sys/arch/%s/include", machinearch);
		p = sourcepath(buf);
		q = "machine";
	} else {
		p = strdup("machine");
		q = strdup("target");
	}
	(void)unlink(q);
	ret = symlink(p, q);
	if (ret)
		(void)fprintf(stderr, "config: symlink(%s -> %s): %s\n",
		    q, p, strerror(errno));
	free(p);

	return (ret);
}

static __dead void
stop()
{
	(void)fprintf(stderr, "*** Stop.\n");
	exit(1);
}

/*
 * Define a standard option, for which a header file will be generated.
 */
void
defoption(name)
	const char *name;
{
	register const char *n;
	register char *p, c;
	char low[500];

	/*
	 * Convert to lower case.  The header file name will be
	 * in lower case, so we store the lower case version in
	 * the hash table to detect option name collisions.  The
	 * original string will be stored in the nvlist for use
	 * in the header file.
	 */
	for (n = name, p = low; (c = *n) != '\0'; n++)
		*p++ = isupper(c) ? tolower(c) : c;
	*p = 0;

	n = intern(low);
	(void)do_option(defopttab, &nextdefopt, n, name, "defopt");

	/*
	 * Insert a verbatum copy of the option name, as well,
	 * to speed lookups when creating the Makefile.
	 */
	(void)ht_insert(defopttab, name, (void *)name);
}

/*
 * Remove an option.
 */
void
removeoption(name)
        const char *name;
{
	register struct nvlist *nv, *nvt;
	register const char *n;
	register char *p, c;
	char low[500];

	if ((nv = ht_lookup(opttab, name)) != NULL) {
		if (options == nv)
		{
			options = nv->nv_next;
			nvfree(nv);
		} else {
			nvt = options;
			while (nvt->nv_next != NULL) {
				if (nvt->nv_next == nv) {
					nvt->nv_next = nvt->nv_next->nv_next;
					nvfree(nv);
					break;
				}
				else
					nvt = nvt->nv_next;
			}
		}
	}

	(void)ht_remove(opttab, name);

	/* make lowercase, then add to select table */
	for (n = name, p = low; (c = *n) != '\0'; n++)
		*p++ = isupper(c) ? tolower(c) : c;
	*p = 0;
	n = intern(low);
	(void)ht_remove(selecttab, n);
}

/*
 * Add an option from "options FOO".  Note that this selects things that
 * are "optional foo".
 */
void
addoption(name, value)
	const char *name, *value;
{
	register const char *n;
	register char *p, c;
	char low[500];

	if (do_option(opttab, &nextopt, name, value, "options"))
		return;

	/* make lowercase, then add to select table */
	for (n = name, p = low; (c = *n) != '\0'; n++)
		*p++ = isupper(c) ? tolower(c) : c;
	*p = 0;
	n = intern(low);
	(void)ht_insert(selecttab, n, (void *)n);
}


/*
 * Add a select from "select FOO". This selects things that
 * are "optional foo".
 */
void
addselect(name)
	const char *name;
{
	register const char *n;
	register char *p, c;
	char low[500];

	/* make lowercase, then add to select table */
	for (n = name, p = low; (c = *n) != '\0'; n++)
		*p++ = isupper(c) ? tolower(c) : c;
	*p = 0;
	n = intern(low);
	(void)ht_insert(selecttab, n, (void *)n);
}

/*
 * Remove a select.
 */