The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/compat/linux/linux_util.c

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    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: releng/11.2/sys/compat/linux/linux_util.c 325015 2017-10-26 17:45:01Z tijl $");
   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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