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 "opt_compat.h" 38 39 #include <sys/param.h> 40 #include <sys/bus.h> 41 #include <sys/fcntl.h> 42 #include <sys/lock.h> 43 #include <sys/malloc.h> 44 #include <sys/kernel.h> 45 #include <sys/linker_set.h> 46 #include <sys/mutex.h> 47 #include <sys/namei.h> 48 #include <sys/proc.h> 49 #include <sys/sdt.h> 50 #include <sys/syscallsubr.h> 51 #include <sys/systm.h> 52 #include <sys/vnode.h> 53 54 #include <machine/stdarg.h> 55 56 #include <compat/linux/linux_util.h> 57 58 MALLOC_DEFINE(M_LINUX, "linux", "Linux mode structures"); 59 MALLOC_DEFINE(M_EPOLL, "lepoll", "Linux events structures"); 60 MALLOC_DEFINE(M_FUTEX, "futex", "Linux futexes"); 61 MALLOC_DEFINE(M_FUTEX_WP, "futex wp", "Linux futex waiting proc"); 62 63 const char linux_emul_path[] = "/compat/linux"; 64 65 /* 66 * Search an alternate path before passing pathname arguments on to 67 * system calls. Useful for keeping a separate 'emulation tree'. 68 * 69 * If cflag is set, we check if an attempt can be made to create the 70 * named file, i.e. we check if the directory it should be in exists. 71 */ 72 int 73 linux_emul_convpath(struct thread *td, const char *path, enum uio_seg pathseg, 74 char **pbuf, int cflag, int dfd) 75 { 76 int retval; 77 78 retval = kern_alternate_path(td, linux_emul_path, path, pathseg, pbuf, 79 cflag, dfd); 80 81 return (retval); 82 } 83 84 void 85 linux_msg(const struct thread *td, const char *fmt, ...) 86 { 87 va_list ap; 88 struct proc *p; 89 90 p = td->td_proc; 91 printf("linux: pid %d (%s): ", (int)p->p_pid, p->p_comm); 92 va_start(ap, fmt); 93 vprintf(fmt, ap); 94 va_end(ap); 95 printf("\n"); 96 } 97 98 struct device_element 99 { 100 TAILQ_ENTRY(device_element) list; 101 struct linux_device_handler entry; 102 }; 103 104 static TAILQ_HEAD(, device_element) devices = 105 TAILQ_HEAD_INITIALIZER(devices); 106 107 static struct linux_device_handler null_handler = 108 { "mem", "mem", "null", "null", 1, 3, 1}; 109 110 DATA_SET(linux_device_handler_set, null_handler); 111 112 char * 113 linux_driver_get_name_dev(device_t dev) 114 { 115 struct device_element *de; 116 const char *device_name = device_get_name(dev); 117 118 if (device_name == NULL) 119 return (NULL); 120 TAILQ_FOREACH(de, &devices, list) { 121 if (strcmp(device_name, de->entry.bsd_driver_name) == 0) 122 return (de->entry.linux_driver_name); 123 } 124 125 return (NULL); 126 } 127 128 int 129 linux_driver_get_major_minor(const char *node, int *major, int *minor) 130 { 131 struct device_element *de; 132 unsigned long devno; 133 size_t sz; 134 135 if (node == NULL || major == NULL || minor == NULL) 136 return (1); 137 138 sz = sizeof("pts/") - 1; 139 if (strncmp(node, "pts/", sz) == 0 && node[sz] != '\0') { 140 /* 141 * Linux checks major and minors of the slave device 142 * to make sure it's a pty device, so let's make him 143 * believe it is. 144 */ 145 devno = strtoul(node + sz, NULL, 10); 146 *major = 136 + (devno / 256); 147 *minor = devno % 256; 148 return (0); 149 } 150 151 sz = sizeof("dri/card") - 1; 152 if (strncmp(node, "dri/card", sz) == 0 && node[sz] != '\0') { 153 devno = strtoul(node + sz, NULL, 10); 154 *major = 226 + (devno / 256); 155 *minor = devno % 256; 156 return (0); 157 } 158 sz = sizeof("dri/controlD") - 1; 159 if (strncmp(node, "dri/controlD", sz) == 0 && node[sz] != '\0') { 160 devno = strtoul(node + sz, NULL, 10); 161 *major = 226 + (devno / 256); 162 *minor = devno % 256; 163 return (0); 164 } 165 sz = sizeof("dri/renderD") - 1; 166 if (strncmp(node, "dri/renderD", sz) == 0 && node[sz] != '\0') { 167 devno = strtoul(node + sz, NULL, 10); 168 *major = 226 + (devno / 256); 169 *minor = devno % 256; 170 return (0); 171 } 172 sz = sizeof("drm/") - 1; 173 if (strncmp(node, "drm/", sz) == 0 && node[sz] != '\0') { 174 devno = strtoul(node + sz, NULL, 10); 175 *major = 226 + (devno / 256); 176 *minor = devno % 256; 177 return (0); 178 } 179 180 TAILQ_FOREACH(de, &devices, list) { 181 if (strcmp(node, de->entry.bsd_device_name) == 0) { 182 *major = de->entry.linux_major; 183 *minor = de->entry.linux_minor; 184 return (0); 185 } 186 } 187 188 return (1); 189 } 190 191 char * 192 linux_get_char_devices() 193 { 194 struct device_element *de; 195 char *temp, *string, *last; 196 char formated[256]; 197 int current_size = 0, string_size = 1024; 198 199 string = malloc(string_size, M_LINUX, M_WAITOK); 200 string[0] = '\000'; 201 last = ""; 202 TAILQ_FOREACH(de, &devices, list) { 203 if (!de->entry.linux_char_device) 204 continue; 205 temp = string; 206 if (strcmp(last, de->entry.bsd_driver_name) != 0) { 207 last = de->entry.bsd_driver_name; 208 209 snprintf(formated, sizeof(formated), "%3d %s\n", 210 de->entry.linux_major, 211 de->entry.linux_device_name); 212 if (strlen(formated) + current_size 213 >= string_size) { 214 string_size *= 2; 215 string = malloc(string_size, 216 M_LINUX, M_WAITOK); 217 bcopy(temp, string, current_size); 218 free(temp, M_LINUX); 219 } 220 strcat(string, formated); 221 current_size = strlen(string); 222 } 223 } 224 225 return (string); 226 } 227 228 void 229 linux_free_get_char_devices(char *string) 230 { 231 232 free(string, M_LINUX); 233 } 234 235 static int linux_major_starting = 200; 236 237 int 238 linux_device_register_handler(struct linux_device_handler *d) 239 { 240 struct device_element *de; 241 242 if (d == NULL) 243 return (EINVAL); 244 245 de = malloc(sizeof(*de), M_LINUX, M_WAITOK); 246 if (d->linux_major < 0) { 247 d->linux_major = linux_major_starting++; 248 } 249 bcopy(d, &de->entry, sizeof(*d)); 250 251 /* Add the element to the list, sorted on span. */ 252 TAILQ_INSERT_TAIL(&devices, de, list); 253 254 return (0); 255 } 256 257 int 258 linux_device_unregister_handler(struct linux_device_handler *d) 259 { 260 struct device_element *de; 261 262 if (d == NULL) 263 return (EINVAL); 264 265 TAILQ_FOREACH(de, &devices, list) { 266 if (bcmp(d, &de->entry, sizeof(*d)) == 0) { 267 TAILQ_REMOVE(&devices, de, list); 268 free(de, M_LINUX); 269 270 return (0); 271 } 272 } 273 274 return (EINVAL); 275 } 276