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/sysctl.h> 50 #include <sys/systm.h> 51 #include <sys/vnode.h> 52 53 #include <machine/stdarg.h> 54 55 #include <compat/linux/linux_mib.h> 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 char linux_emul_path[MAXPATHLEN] = "/compat/linux"; 64 65 SYSCTL_STRING(_compat_linux, OID_AUTO, emul_path, CTLFLAG_RWTUN, 66 linux_emul_path, sizeof(linux_emul_path), 67 "Linux runtime environment path"); 68 69 /* 70 * Search an alternate path before passing pathname arguments on to 71 * system calls. Useful for keeping a separate 'emulation tree'. 72 * 73 * If cflag is set, we check if an attempt can be made to create the 74 * named file, i.e. we check if the directory it should be in exists. 75 */ 76 int 77 linux_emul_convpath(struct thread *td, const char *path, enum uio_seg pathseg, 78 char **pbuf, int cflag, int dfd) 79 { 80 int retval; 81 82 retval = kern_alternate_path(td, linux_emul_path, path, pathseg, pbuf, 83 cflag, dfd); 84 85 return (retval); 86 } 87 88 void 89 linux_msg(const struct thread *td, const char *fmt, ...) 90 { 91 va_list ap; 92 struct proc *p; 93 94 if (linux_debug == 0) 95 return; 96 97 p = td->td_proc; 98 printf("linux: pid %d (%s): ", (int)p->p_pid, p->p_comm); 99 va_start(ap, fmt); 100 vprintf(fmt, ap); 101 va_end(ap); 102 printf("\n"); 103 } 104 105 struct device_element 106 { 107 TAILQ_ENTRY(device_element) list; 108 struct linux_device_handler entry; 109 }; 110 111 static TAILQ_HEAD(, device_element) devices = 112 TAILQ_HEAD_INITIALIZER(devices); 113 114 static struct linux_device_handler null_handler = 115 { "mem", "mem", "null", "null", 1, 3, 1}; 116 117 DATA_SET(linux_device_handler_set, null_handler); 118 119 char * 120 linux_driver_get_name_dev(device_t dev) 121 { 122 struct device_element *de; 123 const char *device_name = device_get_name(dev); 124 125 if (device_name == NULL) 126 return (NULL); 127 TAILQ_FOREACH(de, &devices, list) { 128 if (strcmp(device_name, de->entry.bsd_driver_name) == 0) 129 return (de->entry.linux_driver_name); 130 } 131 132 return (NULL); 133 } 134 135 int 136 linux_driver_get_major_minor(const char *node, int *major, int *minor) 137 { 138 struct device_element *de; 139 unsigned long devno; 140 size_t sz; 141 142 if (node == NULL || major == NULL || minor == NULL) 143 return (1); 144 145 sz = sizeof("pts/") - 1; 146 if (strncmp(node, "pts/", sz) == 0 && node[sz] != '\0') { 147 /* 148 * Linux checks major and minors of the slave device 149 * to make sure it's a pty device, so let's make him 150 * believe it is. 151 */ 152 devno = strtoul(node + sz, NULL, 10); 153 *major = 136 + (devno / 256); 154 *minor = devno % 256; 155 return (0); 156 } 157 158 sz = sizeof("dri/card") - 1; 159 if (strncmp(node, "dri/card", 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/controlD") - 1; 166 if (strncmp(node, "dri/controlD", 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("dri/renderD") - 1; 173 if (strncmp(node, "dri/renderD", 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 sz = sizeof("drm/") - 1; 180 if (strncmp(node, "drm/", sz) == 0 && node[sz] != '\0') { 181 devno = strtoul(node + sz, NULL, 10); 182 *major = 226 + (devno / 256); 183 *minor = devno % 256; 184 return (0); 185 } 186 187 TAILQ_FOREACH(de, &devices, list) { 188 if (strcmp(node, de->entry.bsd_device_name) == 0) { 189 *major = de->entry.linux_major; 190 *minor = de->entry.linux_minor; 191 return (0); 192 } 193 } 194 195 return (1); 196 } 197 198 char * 199 linux_get_char_devices() 200 { 201 struct device_element *de; 202 char *temp, *string, *last; 203 char formated[256]; 204 int current_size = 0, string_size = 1024; 205 206 string = malloc(string_size, M_LINUX, M_WAITOK); 207 string[0] = '\000'; 208 last = ""; 209 TAILQ_FOREACH(de, &devices, list) { 210 if (!de->entry.linux_char_device) 211 continue; 212 temp = string; 213 if (strcmp(last, de->entry.bsd_driver_name) != 0) { 214 last = de->entry.bsd_driver_name; 215 216 snprintf(formated, sizeof(formated), "%3d %s\n", 217 de->entry.linux_major, 218 de->entry.linux_device_name); 219 if (strlen(formated) + current_size 220 >= string_size) { 221 string_size *= 2; 222 string = malloc(string_size, 223 M_LINUX, M_WAITOK); 224 bcopy(temp, string, current_size); 225 free(temp, M_LINUX); 226 } 227 strcat(string, formated); 228 current_size = strlen(string); 229 } 230 } 231 232 return (string); 233 } 234 235 void 236 linux_free_get_char_devices(char *string) 237 { 238 239 free(string, M_LINUX); 240 } 241 242 static int linux_major_starting = 200; 243 244 int 245 linux_device_register_handler(struct linux_device_handler *d) 246 { 247 struct device_element *de; 248 249 if (d == NULL) 250 return (EINVAL); 251 252 de = malloc(sizeof(*de), M_LINUX, M_WAITOK); 253 if (d->linux_major < 0) { 254 d->linux_major = linux_major_starting++; 255 } 256 bcopy(d, &de->entry, sizeof(*d)); 257 258 /* Add the element to the list, sorted on span. */ 259 TAILQ_INSERT_TAIL(&devices, de, list); 260 261 return (0); 262 } 263 264 int 265 linux_device_unregister_handler(struct linux_device_handler *d) 266 { 267 struct device_element *de; 268 269 if (d == NULL) 270 return (EINVAL); 271 272 TAILQ_FOREACH(de, &devices, list) { 273 if (bcmp(d, &de->entry, sizeof(*d)) == 0) { 274 TAILQ_REMOVE(&devices, de, list); 275 free(de, M_LINUX); 276 277 return (0); 278 } 279 } 280 281 return (EINVAL); 282 } 283