1 /*-
2 * Copyright (c) 1994 Christos Zoulas
3 * Copyright (c) 1995 Frank van der Linden
4 * Copyright (c) 1995 Scott Bartram
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 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * from: svr4_util.c,v 1.5 1995/01/22 23:44:50 christos Exp
30 */
31
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
34
35 #include "opt_compat.h"
36
37 #include <sys/param.h>
38 #include <sys/bus.h>
39 #include <sys/fcntl.h>
40 #include <sys/lock.h>
41 #include <sys/malloc.h>
42 #include <sys/kernel.h>
43 #include <sys/linker_set.h>
44 #include <sys/mutex.h>
45 #include <sys/namei.h>
46 #include <sys/proc.h>
47 #include <sys/sdt.h>
48 #include <sys/syscallsubr.h>
49 #include <sys/systm.h>
50 #include <sys/vnode.h>
51
52 #include <machine/stdarg.h>
53
54 #include <compat/linux/linux_util.h>
55
56 MALLOC_DEFINE(M_LINUX, "linux", "Linux mode structures");
57 MALLOC_DEFINE(M_EPOLL, "lepoll", "Linux events structures");
58 MALLOC_DEFINE(M_FUTEX, "futex", "Linux futexes");
59 MALLOC_DEFINE(M_FUTEX_WP, "futex wp", "Linux futex waiting proc");
60
61 const char linux_emul_path[] = "/compat/linux";
62
63 /*
64 * Search an alternate path before passing pathname arguments on to
65 * system calls. Useful for keeping a separate 'emulation tree'.
66 *
67 * If cflag is set, we check if an attempt can be made to create the
68 * named file, i.e. we check if the directory it should be in exists.
69 */
70 int
71 linux_emul_convpath(struct thread *td, const char *path, enum uio_seg pathseg,
72 char **pbuf, int cflag, int dfd)
73 {
74 int retval;
75
76 retval = kern_alternate_path(td, linux_emul_path, path, pathseg, pbuf,
77 cflag, dfd);
78
79 return (retval);
80 }
81
82 void
83 linux_msg(const struct thread *td, const char *fmt, ...)
84 {
85 va_list ap;
86 struct proc *p;
87
88 p = td->td_proc;
89 printf("linux: pid %d (%s): ", (int)p->p_pid, p->p_comm);
90 va_start(ap, fmt);
91 vprintf(fmt, ap);
92 va_end(ap);
93 printf("\n");
94 }
95
96 struct device_element
97 {
98 TAILQ_ENTRY(device_element) list;
99 struct linux_device_handler entry;
100 };
101
102 static TAILQ_HEAD(, device_element) devices =
103 TAILQ_HEAD_INITIALIZER(devices);
104
105 static struct linux_device_handler null_handler =
106 { "mem", "mem", "null", "null", 1, 3, 1};
107
108 DATA_SET(linux_device_handler_set, null_handler);
109
110 char *
111 linux_driver_get_name_dev(device_t dev)
112 {
113 struct device_element *de;
114 const char *device_name = device_get_name(dev);
115
116 if (device_name == NULL)
117 return (NULL);
118 TAILQ_FOREACH(de, &devices, list) {
119 if (strcmp(device_name, de->entry.bsd_driver_name) == 0)
120 return (de->entry.linux_driver_name);
121 }
122
123 return (NULL);
124 }
125
126 int
127 linux_driver_get_major_minor(const char *node, int *major, int *minor)
128 {
129 struct device_element *de;
130 unsigned long devno;
131 size_t sz;
132
133 if (node == NULL || major == NULL || minor == NULL)
134 return (1);
135
136 sz = sizeof("pts/") - 1;
137 if (strncmp(node, "pts/", sz) == 0 && node[sz] != '\0') {
138 /*
139 * Linux checks major and minors of the slave device
140 * to make sure it's a pty device, so let's make him
141 * believe it is.
142 */
143 devno = strtoul(node + sz, NULL, 10);
144 *major = 136 + (devno / 256);
145 *minor = devno % 256;
146 return (0);
147 }
148
149 sz = sizeof("dri/card") - 1;
150 if (strncmp(node, "dri/card", sz) == 0 && node[sz] != '\0') {
151 devno = strtoul(node + sz, NULL, 10);
152 *major = 226 + (devno / 256);
153 *minor = devno % 256;
154 return (0);
155 }
156 sz = sizeof("dri/controlD") - 1;
157 if (strncmp(node, "dri/controlD", sz) == 0 && node[sz] != '\0') {
158 devno = strtoul(node + sz, NULL, 10);
159 *major = 226 + (devno / 256);
160 *minor = devno % 256;
161 return (0);
162 }
163 sz = sizeof("dri/renderD") - 1;
164 if (strncmp(node, "dri/renderD", sz) == 0 && node[sz] != '\0') {
165 devno = strtoul(node + sz, NULL, 10);
166 *major = 226 + (devno / 256);
167 *minor = devno % 256;
168 return (0);
169 }
170 sz = sizeof("drm/") - 1;
171 if (strncmp(node, "drm/", sz) == 0 && node[sz] != '\0') {
172 devno = strtoul(node + sz, NULL, 10);
173 *major = 226 + (devno / 256);
174 *minor = devno % 256;
175 return (0);
176 }
177
178 TAILQ_FOREACH(de, &devices, list) {
179 if (strcmp(node, de->entry.bsd_device_name) == 0) {
180 *major = de->entry.linux_major;
181 *minor = de->entry.linux_minor;
182 return (0);
183 }
184 }
185
186 return (1);
187 }
188
189 char *
190 linux_get_char_devices()
191 {
192 struct device_element *de;
193 char *temp, *string, *last;
194 char formated[256];
195 int current_size = 0, string_size = 1024;
196
197 string = malloc(string_size, M_LINUX, M_WAITOK);
198 string[0] = '\000';
199 last = "";
200 TAILQ_FOREACH(de, &devices, list) {
201 if (!de->entry.linux_char_device)
202 continue;
203 temp = string;
204 if (strcmp(last, de->entry.bsd_driver_name) != 0) {
205 last = de->entry.bsd_driver_name;
206
207 snprintf(formated, sizeof(formated), "%3d %s\n",
208 de->entry.linux_major,
209 de->entry.linux_device_name);
210 if (strlen(formated) + current_size
211 >= string_size) {
212 string_size *= 2;
213 string = malloc(string_size,
214 M_LINUX, M_WAITOK);
215 bcopy(temp, string, current_size);
216 free(temp, M_LINUX);
217 }
218 strcat(string, formated);
219 current_size = strlen(string);
220 }
221 }
222
223 return (string);
224 }
225
226 void
227 linux_free_get_char_devices(char *string)
228 {
229
230 free(string, M_LINUX);
231 }
232
233 static int linux_major_starting = 200;
234
235 int
236 linux_device_register_handler(struct linux_device_handler *d)
237 {
238 struct device_element *de;
239
240 if (d == NULL)
241 return (EINVAL);
242
243 de = malloc(sizeof(*de), M_LINUX, M_WAITOK);
244 if (d->linux_major < 0) {
245 d->linux_major = linux_major_starting++;
246 }
247 bcopy(d, &de->entry, sizeof(*d));
248
249 /* Add the element to the list, sorted on span. */
250 TAILQ_INSERT_TAIL(&devices, de, list);
251
252 return (0);
253 }
254
255 int
256 linux_device_unregister_handler(struct linux_device_handler *d)
257 {
258 struct device_element *de;
259
260 if (d == NULL)
261 return (EINVAL);
262
263 TAILQ_FOREACH(de, &devices, list) {
264 if (bcmp(d, &de->entry, sizeof(*d)) == 0) {
265 TAILQ_REMOVE(&devices, de, list);
266 free(de, M_LINUX);
267
268 return (0);
269 }
270 }
271
272 return (EINVAL);
273 }
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