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      1 /*	$NetBSD: autoconf.c,v 1.18 2025/05/19 06:16:24 andvar Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2002 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: autoconf.c,v 1.18 2025/05/19 06:16:24 andvar Exp $");
     31 
     32 #include "opt_md.h"
     33 
     34 #include <sys/param.h>
     35 #include <sys/systm.h>
     36 #include <sys/device.h>
     37 #include <sys/disklabel.h>
     38 #include <sys/conf.h>
     39 #include <sys/vnode.h>
     40 #include <sys/fcntl.h>
     41 #include <sys/proc.h>
     42 #include <sys/disk.h>
     43 #include <sys/kauth.h>
     44 
     45 #include <dev/i2c/i2cvar.h>
     46 
     47 #include <machine/intr.h>
     48 #include <machine/bootconfig.h>
     49 #include <machine/bootinfo.h>
     50 #include <machine/config_hook.h>
     51 
     52 static int is_valid_disk(device_t dv);
     53 static int match_bootdisk(device_t dv, struct btinfo_bootdisk *bid);
     54 static void findroot(void);
     55 
     56 void
     57 cpu_configure(void)
     58 {
     59 
     60 	splhigh();
     61 	splserial();
     62 
     63 	config_hook_init();
     64 
     65 	if (config_rootfound("mainbus", NULL) == NULL)
     66 		panic("no mainbus found");
     67 
     68 	/* Configuration is finished, turn on interrupts. */
     69 	spl0();
     70 }
     71 
     72 static int
     73 is_valid_disk(device_t dv)
     74 {
     75 
     76 	if (device_class(dv) != DV_DISK)
     77 		return 0;
     78 
     79 	return (device_is_a(dv, "dk") ||
     80 		device_is_a(dv, "sd") ||
     81 		device_is_a(dv, "wd") ||
     82 		device_is_a(dv, "ld"));
     83 }
     84 
     85 /*
     86  * Helper function for findroot():
     87  * Return non-zero if disk device matches bootinfo.
     88  */
     89 static int
     90 match_bootdisk(device_t dv, struct btinfo_bootdisk *bid)
     91 {
     92 	struct vnode *tmpvn;
     93 	int error;
     94 	struct disklabel label;
     95 	int found = 0;
     96 
     97 	if (device_is_a(dv, "dk"))
     98 		return 0;
     99 
    100 	/*
    101 	 * A disklabel is required here.  The boot loader doesn't refuse
    102 	 * to boot from a disk without a label, but this is normally not
    103 	 * wanted.
    104 	 */
    105 	if (bid->labelsector == -1)
    106 		return 0;
    107 
    108 	if ((tmpvn = opendisk(dv)) == NULL)
    109 		return 0;
    110 
    111 	VOP_UNLOCK(tmpvn);
    112 	error = VOP_IOCTL(tmpvn, DIOCGDINFO, &label, FREAD, NOCRED);
    113 	vn_lock(tmpvn, LK_EXCLUSIVE | LK_RETRY);
    114 	if (error) {
    115 		/*
    116 		 * XXX Can't happen -- open() would have errored out
    117 		 * or faked one up.
    118 		 */
    119 		printf("match_bootdisk: can't get label for dev %s (%d)\n",
    120 		    device_xname(dv), error);
    121 		goto closeout;
    122 	}
    123 
    124 	/* Compare with our data. */
    125 	if (label.d_type == bid->label.type &&
    126 	    label.d_checksum == bid->label.checksum &&
    127 	    strncmp(label.d_packname, bid->label.packname, 16) == 0)
    128 		found = 1;
    129 
    130  closeout:
    131 	VOP_CLOSE(tmpvn, FREAD, NOCRED);
    132 	vput(tmpvn);
    133 	return found;
    134 }
    135 
    136 static void
    137 findroot(void)
    138 {
    139 	struct btinfo_rootdevice *biv;
    140 	struct btinfo_bootdisk *bid;
    141 	device_t dv;
    142 	deviter_t di;
    143 
    144 	if (booted_device)
    145 		return;
    146 
    147 	if ((biv = lookup_bootinfo(BTINFO_ROOTDEVICE)) != NULL) {
    148 		for (dv = deviter_first(&di, DEVITER_F_ROOT_FIRST);
    149 		     dv != NULL;
    150 		     dv = deviter_next(&di)) {
    151 			cfdata_t cd;
    152 			size_t len;
    153 
    154 			if (device_class(dv) != DV_DISK)
    155 				continue;
    156 
    157 			cd = device_cfdata(dv);
    158 			len = strlen(cd->cf_name);
    159 
    160 			if (strncmp(cd->cf_name, biv->devname, len) == 0 &&
    161 			    biv->devname[len] - '0' == cd->cf_unit) {
    162 				booted_device = dv;
    163 				booted_partition = biv->devname[len + 1] - 'a';
    164 				break;
    165 			}
    166 		}
    167 		deviter_release(&di);
    168 		if (dv != NULL)
    169 			return;
    170 	}
    171 
    172 	if ((bid = lookup_bootinfo(BTINFO_BOOTDISK)) != NULL) {
    173 		/*
    174 		 * Scan all disk devices for ones that match the passed data.
    175 		 * Don't break if one is found, to get possible multiple
    176 		 * matches - for problem tracking.  Use the first match anyway
    177 		 * because lower device numbers are more likely to be the
    178 		 * boot device.
    179 		 */
    180 		for (dv = deviter_first(&di, DEVITER_F_ROOT_FIRST);
    181 		     dv != NULL;
    182 		     dv = deviter_next(&di)) {
    183 			if (device_class(dv) != DV_DISK)
    184 				continue;
    185 
    186 			if (is_valid_disk(dv)) {
    187 				if (match_bootdisk(dv, bid))
    188 					goto bootdisk_found;
    189 			}
    190 			continue;
    191 
    192  bootdisk_found:
    193 			if (booted_device) {
    194 				printf("WARNING: double match for boot "
    195 				    "device (%s, %s)\n",
    196 				    device_xname(booted_device),
    197 				    device_xname(dv));
    198 				continue;
    199 			}
    200 			booted_device = dv;
    201 			booted_partition = bid->partition;
    202 		}
    203 		deviter_release(&di);
    204 
    205 		if (booted_device)
    206 			return;
    207 	}
    208 }
    209 
    210 void
    211 cpu_rootconf(void)
    212 {
    213 
    214 	findroot();
    215 
    216 	aprint_normal("boot device: %s\n",
    217 	    booted_device ? device_xname(booted_device) : "<unknown>");
    218 	rootconf();
    219 }
    220 
    221 void
    222 device_register(device_t dev, void *aux)
    223 {
    224 
    225 	/*
    226 	 * I2C bus connected to pxaiic(4) for zaudio(4) devices has
    227 	 * limited capabilities.
    228 	 */
    229 	if (device_is_a(dev, "iic") &&
    230 	    device_is_a(device_parent(dev), "ziic")) {
    231 		(void)prop_dictionary_set_string_nocopy(device_properties(dev),
    232 		    I2C_PROP_INDIRECT_PROBE_STRATEGY, I2C_PROBE_STRATEGY_NONE);
    233 	}
    234 }
    235