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 p = td->td_proc; 95 printf("linux: pid %d (%s): ", (int)p->p_pid, p->p_comm); 96 va_start(ap, fmt); 97 vprintf(fmt, ap); 98 va_end(ap); 99 printf("\n"); 100 } 101 102 struct device_element 103 { 104 TAILQ_ENTRY(device_element) list; 105 struct linux_device_handler entry; 106 }; 107 108 static TAILQ_HEAD(, device_element) devices = 109 TAILQ_HEAD_INITIALIZER(devices); 110 111 static struct linux_device_handler null_handler = 112 { "mem", "mem", "null", "null", 1, 3, 1}; 113 114 DATA_SET(linux_device_handler_set, null_handler); 115 116 char * 117 linux_driver_get_name_dev(device_t dev) 118 { 119 struct device_element *de; 120 const char *device_name = device_get_name(dev); 121 122 if (device_name == NULL) 123 return (NULL); 124 TAILQ_FOREACH(de, &devices, list) { 125 if (strcmp(device_name, de->entry.bsd_driver_name) == 0) 126 return (de->entry.linux_driver_name); 127 } 128 129 return (NULL); 130 } 131 132 int 133 linux_driver_get_major_minor(const char *node, int *major, int *minor) 134 { 135 struct device_element *de; 136 unsigned long devno; 137 size_t sz; 138 139 if (node == NULL || major == NULL || minor == NULL) 140 return (1); 141 142 sz = sizeof("pts/") - 1; 143 if (strncmp(node, "pts/", sz) == 0 && node[sz] != '\0') { 144 /* 145 * Linux checks major and minors of the slave device 146 * to make sure it's a pty device, so let's make him 147 * believe it is. 148 */ 149 devno = strtoul(node + sz, NULL, 10); 150 *major = 136 + (devno / 256); 151 *minor = devno % 256; 152 return (0); 153 } 154 155 sz = sizeof("dri/card") - 1; 156 if (strncmp(node, "dri/card", sz) == 0 && node[sz] != '\0') { 157 devno = strtoul(node + sz, NULL, 10); 158 *major = 226 + (devno / 256); 159 *minor = devno % 256; 160 return (0); 161 } 162 sz = sizeof("dri/controlD") - 1; 163 if (strncmp(node, "dri/controlD", sz) == 0 && node[sz] != '\0') { 164 devno = strtoul(node + sz, NULL, 10); 165 *major = 226 + (devno / 256); 166 *minor = devno % 256; 167 return (0); 168 } 169 sz = sizeof("dri/renderD") - 1; 170 if (strncmp(node, "dri/renderD", sz) == 0 && node[sz] != '\0') { 171 devno = strtoul(node + sz, NULL, 10); 172 *major = 226 + (devno / 256); 173 *minor = devno % 256; 174 return (0); 175 } 176 sz = sizeof("drm/") - 1; 177 if (strncmp(node, "drm/", sz) == 0 && node[sz] != '\0') { 178 devno = strtoul(node + sz, NULL, 10); 179 *major = 226 + (devno / 256); 180 *minor = devno % 256; 181 return (0); 182 } 183 184 TAILQ_FOREACH(de, &devices, list) { 185 if (strcmp(node, de->entry.bsd_device_name) == 0) { 186 *major = de->entry.linux_major; 187 *minor = de->entry.linux_minor; 188 return (0); 189 } 190 } 191 192 return (1); 193 } 194 195 char * 196 linux_get_char_devices() 197 { 198 struct device_element *de; 199 char *temp, *string, *last; 200 char formated[256]; 201 int current_size = 0, string_size = 1024; 202 203 string = malloc(string_size, M_LINUX, M_WAITOK); 204 string[0] = '\000'; 205 last = ""; 206 TAILQ_FOREACH(de, &devices, list) { 207 if (!de->entry.linux_char_device) 208 continue; 209 temp = string; 210 if (strcmp(last, de->entry.bsd_driver_name) != 0) { 211 last = de->entry.bsd_driver_name; 212 213 snprintf(formated, sizeof(formated), "%3d %s\n", 214 de->entry.linux_major, 215 de->entry.linux_device_name); 216 if (strlen(formated) + current_size 217 >= string_size) { 218 string_size *= 2; 219 string = malloc(string_size, 220 M_LINUX, M_WAITOK); 221 bcopy(temp, string, current_size); 222 free(temp, M_LINUX); 223 } 224 strcat(string, formated); 225 current_size = strlen(string); 226 } 227 } 228 229 return (string); 230 } 231 232 void 233 linux_free_get_char_devices(char *string) 234 { 235 236 free(string, M_LINUX); 237 } 238 239 static int linux_major_starting = 200; 240 241 int 242 linux_device_register_handler(struct linux_device_handler *d) 243 { 244 struct device_element *de; 245 246 if (d == NULL) 247 return (EINVAL); 248 249 de = malloc(sizeof(*de), M_LINUX, M_WAITOK); 250 if (d->linux_major < 0) { 251 d->linux_major = linux_major_starting++; 252 } 253 bcopy(d, &de->entry, sizeof(*d)); 254 255 /* Add the element to the list, sorted on span. */ 256 TAILQ_INSERT_TAIL(&devices, de, list); 257 258 return (0); 259 } 260 261 int 262 linux_device_unregister_handler(struct linux_device_handler *d) 263 { 264 struct device_element *de; 265 266 if (d == NULL) 267 return (EINVAL); 268 269 TAILQ_FOREACH(de, &devices, list) { 270 if (bcmp(d, &de->entry, sizeof(*d)) == 0) { 271 TAILQ_REMOVE(&devices, de, list); 272 free(de, M_LINUX); 273 274 return (0); 275 } 276 } 277 278 return (EINVAL); 279 } 280