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/6.4/sys/compat/linux/linux_util.c 159642 2006-06-15 15:52:05Z ambrisko $");
   34 
   35 #include <sys/param.h>
   36 #include <sys/bus.h>
   37 #include <sys/lock.h>
   38 #include <sys/malloc.h>
   39 #include <sys/linker_set.h>
   40 #include <sys/mutex.h>
   41 #include <sys/namei.h>
   42 #include <sys/proc.h>
   43 #include <sys/syscallsubr.h>
   44 #include <sys/systm.h>
   45 #include <sys/vnode.h>
   46 
   47 #include <machine/stdarg.h>
   48 
   49 #include <compat/linux/linux_util.h>
   50 
   51 const char      linux_emul_path[] = "/compat/linux";
   52 
   53 /*
   54  * Search an alternate path before passing pathname arguments on
   55  * to system calls. Useful for keeping a separate 'emulation tree'.
   56  *
   57  * If cflag is set, we check if an attempt can be made to create
   58  * the named file, i.e. we check if the directory it should
   59  * be in exists.
   60  */
   61 int
   62 linux_emul_convpath(td, path, pathseg, pbuf, cflag)
   63         struct thread    *td;
   64         char             *path;
   65         enum uio_seg      pathseg;
   66         char            **pbuf;
   67         int               cflag;
   68 {
   69 
   70         return (kern_alternate_path(td, linux_emul_path, path, pathseg, pbuf,
   71                 cflag));
   72 }
   73 
   74 void
   75 linux_msg(const struct thread *td, const char *fmt, ...)
   76 {
   77         va_list ap;
   78         struct proc *p;
   79 
   80         p = td->td_proc;
   81         printf("linux: pid %d (%s): ", (int)p->p_pid, p->p_comm);
   82         va_start(ap, fmt);
   83         vprintf(fmt, ap);
   84         va_end(ap);
   85         printf("\n");
   86 }
   87 
   88 MALLOC_DECLARE(M_LINUX);
   89 
   90 struct device_element
   91 {
   92         TAILQ_ENTRY(device_element) list;
   93         struct linux_device_handler entry;
   94 };
   95 
   96 static TAILQ_HEAD(, device_element) devices =
   97         TAILQ_HEAD_INITIALIZER(devices);
   98 
   99 static struct linux_device_handler null_handler =
  100         { "mem", "mem", "null", "null", 1, 3, 1};
  101 
  102 DATA_SET(linux_device_handler_set, null_handler);
  103 
  104 char *
  105 linux_driver_get_name_dev(device_t dev)
  106 {
  107         struct device_element *de;
  108         const char *device_name = device_get_name(dev);
  109 
  110         if (device_name == NULL)
  111                 return NULL;
  112         TAILQ_FOREACH(de, &devices, list) {
  113                 if (strcmp(device_name, de->entry.bsd_driver_name) == 0)
  114                         return (de->entry.linux_driver_name);
  115         }
  116 
  117         return NULL;
  118 }
  119 
  120 int
  121 linux_driver_get_major_minor(char *node, int *major, int *minor)
  122 {
  123         struct device_element *de;
  124 
  125         if (node == NULL || major == NULL || minor == NULL)
  126                 return 1;
  127         TAILQ_FOREACH(de, &devices, list) {
  128                 if (strcmp(node, de->entry.bsd_device_name) == 0) {
  129                         *major = de->entry.linux_major;
  130                         *minor = de->entry.linux_minor;
  131                         return 0;
  132                 }
  133         }
  134 
  135         return 1;
  136 }
  137 
  138 char *
  139 linux_get_char_devices()
  140 {
  141         struct device_element *de;
  142         char *temp, *string, *last;
  143         char formated[256];
  144         int current_size = 0, string_size = 1024;
  145 
  146         MALLOC(string, char *, string_size, M_LINUX, M_WAITOK);
  147         string[0] = '\000';
  148         last = "";
  149         TAILQ_FOREACH(de, &devices, list) {
  150                 if (!de->entry.linux_char_device)
  151                         continue;
  152                 temp = string;
  153                 if (strcmp(last, de->entry.bsd_driver_name) != 0) {
  154                         last = de->entry.bsd_driver_name;
  155 
  156                         snprintf(formated, sizeof(formated), "%3d %s\n",
  157                                  de->entry.linux_major,
  158                                  de->entry.linux_device_name);
  159                         if (strlen(formated) + current_size
  160                             >= string_size) {
  161                                 string_size *= 2;
  162                                 MALLOC(string, char *, string_size,
  163                                     M_LINUX, M_WAITOK);
  164                                 bcopy(temp, string, current_size);
  165                                 FREE(temp, M_LINUX);
  166                         }
  167                         strcat(string, formated);
  168                         current_size = strlen(string);
  169                 }
  170         }
  171 
  172         return string;
  173 }
  174 
  175 void
  176 linux_free_get_char_devices(char *string)
  177 {
  178         FREE(string, M_LINUX);
  179 }
  180 
  181 static int linux_major_starting = 200;
  182 
  183 int
  184 linux_device_register_handler(struct linux_device_handler *d)
  185 {
  186         struct device_element *de;
  187 
  188         if (d == NULL)
  189                 return (EINVAL);
  190 
  191         MALLOC(de, struct device_element *, sizeof(*de),
  192             M_LINUX, M_WAITOK);
  193         if (d->linux_major < 0) {
  194                 d->linux_major = linux_major_starting++;
  195         }
  196         bcopy(d, &de->entry, sizeof(*d));
  197 
  198         /* Add the element to the list, sorted on span. */
  199         TAILQ_INSERT_TAIL(&devices, de, list);
  200 
  201         return (0);
  202 }
  203 
  204 int
  205 linux_device_unregister_handler(struct linux_device_handler *d)
  206 {
  207         struct device_element *de;
  208 
  209         if (d == NULL)
  210                 return (EINVAL);
  211 
  212         TAILQ_FOREACH(de, &devices, list) {
  213                 if (bcmp(d, &de->entry, sizeof(*d)) == 0) {
  214                         TAILQ_REMOVE(&devices, de, list);
  215                         FREE(de, M_LINUX);
  216                         return (0);
  217                 }
  218         }
  219 
  220         return (EINVAL);
  221 }

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