1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1994 Christos Zoulas 5 * Copyright (c) 1995 Frank van der Linden 6 * Copyright (c) 1995 Scott Bartram 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 * 31 * from: svr4_util.c,v 1.5 1995/01/22 23:44:50 christos Exp 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 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 } 274