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      1 /*	$NetBSD: autoconf.c,v 1.26 2012/10/27 17:17:53 chs Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1988 University of Utah.
      5  * Copyright (c) 1992, 1993
      6  *	The Regents of the University of California.  All rights reserved.
      7  *
      8  * This code is derived from software contributed to Berkeley by
      9  * the Systems Programming Group of the University of Utah Computer
     10  * Science Department and Ralph Campbell.
     11  *
     12  * Redistribution and use in source and binary forms, with or without
     13  * modification, are permitted provided that the following conditions
     14  * are met:
     15  * 1. Redistributions of source code must retain the above copyright
     16  *    notice, this list of conditions and the following disclaimer.
     17  * 2. Redistributions in binary form must reproduce the above copyright
     18  *    notice, this list of conditions and the following disclaimer in the
     19  *    documentation and/or other materials provided with the distribution.
     20  * 3. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  *
     36  * from: Utah Hdr: autoconf.c 1.31 91/01/21
     37  *
     38  *	@(#)autoconf.c	8.1 (Berkeley) 6/10/93
     39  */
     40 
     41 #include <sys/cdefs.h>
     42 __KERNEL_RCSID(0, "$NetBSD: autoconf.c,v 1.26 2012/10/27 17:17:53 chs Exp $");
     43 
     44 #include <sys/param.h>
     45 #include <sys/systm.h>
     46 #include <sys/conf.h>
     47 #include <sys/device.h>
     48 
     49 #include <machine/disklabel.h>
     50 
     51 #include <machine/sysconf.h>
     52 #include <machine/config_hook.h>
     53 
     54 void makebootdev(const char *);
     55 
     56 static char __booted_device_name[16];
     57 static void get_device(const char *);
     58 
     59 /*
     60  * Setup the system to run on the current machine.
     61  *
     62  * cpu_configure() is called at boot time.  Available
     63  * devices are determined (from possibilities mentioned in ioconf.c),
     64  * and the drivers are initialized.
     65  */
     66 void
     67 cpu_configure(void)
     68 {
     69 
     70 	/* Kick off autoconfiguration. */
     71 	(void)splhigh();
     72 
     73 	config_hook_init();
     74 
     75 	if (config_rootfound("mainbus", NULL) == NULL)
     76 		panic("no mainbus found");
     77 
     78 	/* Configuration is finished, turn on interrupts. */
     79 	spl0();		/* enable all source forcing SOFT_INTs cleared */
     80 }
     81 
     82 void
     83 cpu_rootconf(void)
     84 {
     85 
     86 	get_device(__booted_device_name);
     87 
     88 	printf("boot device: %s\n",
     89 	    booted_device ? device_xname(booted_device) : "<unknown>");
     90 
     91 	rootconf();
     92 }
     93 
     94 void
     95 makebootdev(const char *cp)
     96 {
     97 
     98 	strncpy(__booted_device_name, cp, 16);
     99 }
    100 
    101 static void
    102 get_device(const char *name)
    103 {
    104 	int unit, part;
    105 	char devname[16];
    106 	const char *cp;
    107 	device_t dv;
    108 
    109 	if (strncmp(name, "/dev/", 5) == 0)
    110 		name += 5;
    111 
    112 	if (devsw_name2blk(name, devname, sizeof(devname)) == -1)
    113 		return;
    114 
    115 	name += strlen(devname);
    116 	unit = part = 0;
    117 
    118 	cp = name;
    119 	while (*cp >= '0' && *cp <= '9')
    120 		unit = (unit * 10) + (*cp++ - '0');
    121 	if (cp == name)
    122 		return;
    123 
    124 	if (*cp >= 'a' && *cp <= ('a' + MAXPARTITIONS))
    125 		part = *cp - 'a';
    126 	else if (*cp != '\0' && *cp != ' ')
    127 		return;
    128 	if ((dv = device_find_by_driver_unit(devname, unit)) != NULL) {
    129 		booted_device = dv;
    130 		booted_partition = part;
    131 	}
    132 }
    133