1 /* $NetBSD: autoconf.c,v 1.25 2023/10/28 17:53:06 mrg Exp $ */
2
3 /*-
4 * Copyright (c) 2001 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Matt Thomas <matt@3am-software.com>.
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 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 __KERNEL_RCSID(0, "$NetBSD: autoconf.c,v 1.25 2023/10/28 17:53:06 mrg Exp $");
34
35 #include "opt_md.h"
36 #include "opt_ddb.h"
37
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/reboot.h>
41 #include <sys/disklabel.h>
42 #include <sys/device.h>
43 #include <sys/conf.h>
44 #include <sys/kernel.h>
45 #include <sys/kmem.h>
46
47 #include <machine/autoconf.h>
48 #include <machine/intr.h>
49 #include <machine/bootconfig.h>
50
51 void (*evbarm_device_register)(device_t, void *);
52 void (*evbarm_device_register_post_config)(device_t, void *);
53 void (*evbarm_cpu_rootconf)(void);
54
55 extern struct cfdata cfdata[];
56
57 #ifndef MEMORY_DISK_IS_ROOT
58 static int get_device(char *name, device_t *, int *);
59 static void set_root_device(void);
60 #endif
61
62 #ifndef MEMORY_DISK_IS_ROOT
63 /* Decode a device name to a major and minor number */
64
65 static int
get_device(char * name,device_t * dvp,int * partp)66 get_device(char *name, device_t *dvp, int *partp)
67 {
68 int unit, part;
69 char devname[16], *cp;
70 device_t dv;
71
72 if (strncmp(name, "/dev/", 5) == 0)
73 name += 5;
74
75 if (devsw_name2blk(name, devname, sizeof(devname)) == -1)
76 return 0;
77
78 name += strlen(devname);
79 unit = part = 0;
80
81 cp = name;
82 while (*cp >= '0' && *cp <= '9')
83 unit = (unit * 10) + (*cp++ - '0');
84 if (cp == name)
85 return 0;
86
87 if (*cp >= 'a' && *cp < ('a' + MAXPARTITIONS))
88 part = *cp - 'a';
89 else if (*cp != '\0' && *cp != ' ')
90 return 0;
91 if ((dv = device_find_by_driver_unit(devname, unit)) != NULL) {
92 *dvp = dv;
93 *partp = part;
94 return 1;
95 }
96
97 return 0;
98 }
99
100 /* Set the rootdev variable from the root specifier in the boot args */
101
102 static char *bootspec_buf = NULL;
103 static size_t bootspec_buflen = 0;
104
105 static void
set_root_device(void)106 set_root_device(void)
107 {
108 char *ptr, *end, *buf;
109 size_t len;
110
111 if (boot_args == NULL)
112 return;
113
114 if (!get_bootconf_option(boot_args, "root", BOOTOPT_TYPE_STRING, &ptr))
115 return;
116
117 if (get_device(ptr, &booted_device, &booted_partition))
118 return;
119
120 /* NUL-terminate string, get_bootconf_option doesn't */
121 for (end = ptr; *end != '\0'; ++end) {
122 if (*end == ' ' || *end == '\t') {
123 break;
124 }
125 }
126
127 if (end == ptr)
128 return;
129
130 len = end - ptr;
131
132 buf = kmem_alloc(len + 1, KM_SLEEP);
133 memcpy(buf, ptr, len);
134 buf[len] = '\0';
135
136 if (bootspec_buf != NULL)
137 kmem_free(bootspec_buf, bootspec_buflen + 1);
138
139 bootspec_buf = buf;
140 bootspec_buflen = len;
141
142 bootspec = bootspec_buf;
143 }
144 #endif
145
146 /*
147 * Set up the root device from the boot args.
148 *
149 * cpu_bootconf() is called before RAIDframe root detection,
150 * and cpu_rootconf() is called after.
151 */
152 void
cpu_bootconf(void)153 cpu_bootconf(void)
154 {
155 #ifndef MEMORY_DISK_IS_ROOT
156 set_root_device();
157 if (evbarm_cpu_rootconf)
158 (*evbarm_cpu_rootconf)();
159 #endif
160 }
161
162 void
cpu_rootconf(void)163 cpu_rootconf(void)
164 {
165 cpu_bootconf();
166 aprint_normal("boot device: %s\n",
167 booted_device != NULL ? device_xname(booted_device) : "<unknown>");
168 rootconf();
169 }
170
171
172 /*
173 * void cpu_configure()
174 *
175 * Configure all the root devices
176 * The root devices are expected to configure their own children
177 */
178 void
cpu_configure(void)179 cpu_configure(void)
180 {
181 struct mainbus_attach_args maa;
182 struct cfdata *cf;
183
184 #ifdef DDB
185 if (boothowto & RB_KDB) {
186 printf("Entering DDB...\n");
187 cpu_Debugger();
188 }
189 #endif
190
191 (void) splhigh();
192
193 for (cf = &cfdata[0]; cf->cf_name; cf++) {
194 if (cf->cf_pspec == NULL) {
195 maa.ma_name = cf->cf_name;
196 if (config_rootfound(cf->cf_name, &maa) != NULL)
197 break;
198 }
199 }
200
201 /* Time to start taking interrupts so lets open the flood gates .... */
202 spl0();
203 }
204
205 void
device_register(device_t dev,void * aux)206 device_register(device_t dev, void *aux)
207 {
208 if (evbarm_device_register != NULL)
209 (*evbarm_device_register)(dev, aux);
210 }
211
212
213 void
device_register_post_config(device_t dev,void * aux)214 device_register_post_config(device_t dev, void *aux)
215 {
216 if (evbarm_device_register_post_config != NULL)
217 (*evbarm_device_register_post_config)(dev, aux);
218 }
219
220