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      1 /*	$NetBSD: autoconf.c,v 1.13 2012/07/29 18:05:44 mlelstv Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1990 The Regents of the University of California.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * William Jolitz.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  *
     34  *	@(#)autoconf.c	7.1 (Berkeley) 5/9/91
     35  */
     36 
     37 /*
     38  * Setup the system to run on the current machine.
     39  *
     40  * Configure() is called at boot time and initializes the vba
     41  * device tables and the memory controller monitoring.  Available
     42  * devices are determined (from possibilities mentioned in ioconf.c),
     43  * and the drivers are initialized.
     44  */
     45 
     46 #include <sys/cdefs.h>
     47 __KERNEL_RCSID(0, "$NetBSD: autoconf.c,v 1.13 2012/07/29 18:05:44 mlelstv Exp $");
     48 
     49 #include <sys/param.h>
     50 #include <sys/systm.h>
     51 #include <sys/buf.h>
     52 #include <sys/disklabel.h>
     53 #include <sys/conf.h>
     54 #include <sys/reboot.h>
     55 #include <sys/device.h>
     56 
     57 #include <machine/pte.h>
     58 #include <machine/intr.h>
     59 
     60 static void findroot(void);
     61 
     62 /*
     63  * Determine i/o configuration for a machine.
     64  */
     65 void
     66 cpu_configure(void)
     67 {
     68 
     69 	if (config_rootfound("mainbus", NULL) == NULL)
     70 		panic("configure: mainbus not configured");
     71 
     72 	genppc_cpu_configure();
     73 }
     74 
     75 void
     76 cpu_rootconf(void)
     77 {
     78 	findroot();
     79 
     80 	aprint_normal("boot device: %s\n",
     81 	    booted_device ? device_xname(booted_device) : "<unknown>");
     82 
     83 	rootconf();
     84 }
     85 
     86 u_long	bootdev = 0;		/* should be dev_t, but not until 32 bits */
     87 
     88 /*
     89  * Attempt to find the device from which we were booted.
     90  * If we can do so, and not instructed not to do so,
     91  * change rootdev to correspond to the load device.
     92  */
     93 void
     94 findroot(void)
     95 {
     96 	int unit, part;
     97 	device_t dv;
     98 	const char *name;
     99 
    100 #if 0
    101 	aprint_normal("howto %x bootdev %x ", boothowto, bootdev);
    102 #endif
    103 
    104 	if ((bootdev & B_MAGICMASK) != (u_long)B_DEVMAGIC)
    105 		return;
    106 
    107 	name = devsw_blk2name((bootdev >> B_TYPESHIFT) & B_TYPEMASK);
    108 	if (name == NULL)
    109 		return;
    110 
    111 	part = (bootdev >> B_PARTITIONSHIFT) & B_PARTITIONMASK;
    112 	unit = (bootdev >> B_UNITSHIFT) & B_UNITMASK;
    113 
    114 	if ((dv = device_find_by_driver_unit(name, unit)) != NULL) {
    115 		booted_device = dv;
    116 		booted_partition = part;
    117 	}
    118 }
    119 
    120 void
    121 device_register(device_t dev, void *aux)
    122 {
    123 	/* do nothing */
    124 }
    125