openpromio.c

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    1 /*-
    2  * Copyright (c) 2003 Jake Burkholder.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD: releng/5.3/sys/dev/ofw/openpromio.c 133862 2004-08-16 15:45:27Z marius $");
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/conf.h>
   34 #include <sys/errno.h>
   35 #include <sys/fcntl.h>
   36 #include <sys/ioccom.h>
   37 #include <sys/kernel.h>
   38 #include <sys/malloc.h>
   39 #include <sys/module.h>
   40 
   41 #include <dev/ofw/openfirm.h>
   42 #include <dev/ofw/openpromio.h>
   43 
   44 /*
   45  * This provides a Solaris compatible character device interface to
   46  * Open Firmware.  It exists entirely for compatibility with software
   47  * like X11, and only the features that are actually needed for that
   48  * are implemented.  The interface sucks too much to actually use,
   49  * new code should use the /dev/openfirm device.
   50  */
   51 
   52 static d_open_t openprom_open;
   53 static d_close_t openprom_close;
   54 static d_ioctl_t openprom_ioctl;
   55 
   56 static int openprom_modevent(module_t mode, int type, void *data);
   57 static int openprom_node_valid(phandle_t node);
   58 static int openprom_node_search(phandle_t root, phandle_t node);
   59 
   60 static struct cdevsw openprom_cdevsw = {
   61         .d_version =    D_VERSION,
   62         .d_flags =      D_NEEDGIANT,
   63         .d_open =       openprom_open,
   64         .d_close =      openprom_close,
   65         .d_ioctl =      openprom_ioctl,
   66         .d_name =       "openprom",
   67 };
   68 
   69 static int openprom_is_open;
   70 static struct cdev *openprom_dev;
   71 static phandle_t openprom_node;
   72 
   73 static int
   74 openprom_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
   75 {
   76 
   77         if (openprom_is_open != 0)
   78                 return (EBUSY);
   79         openprom_is_open = 1;
   80         return (0);
   81 }
   82 
   83 static int
   84 openprom_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
   85 {
   86 
   87         openprom_is_open = 0;
   88         return (0);
   89 }
   90 
   91 static int
   92 openprom_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags,
   93     struct thread *td)
   94 {
   95         struct openpromio *oprom;
   96         phandle_t node;
   97         uint32_t len;
   98         size_t done;
   99         int proplen;
  100         char *prop;
  101         char *buf;
  102         int error;
  103 
  104         error = 0;
  105         oprom = *(void **)data;
  106         switch (cmd) {
  107         case OPROMCHILD:
  108         case OPROMNEXT:
  109                 error = copyin(&oprom->oprom_size, &len, sizeof(len));
  110                 if (error != 0)
  111                         break;
  112                 if (len != sizeof(node)) {
  113                         error = EINVAL;
  114                         break;
  115                 }
  116                 error = copyin(&oprom->oprom_array, &node, sizeof(node));
  117                 if (error != 0)
  118                         break;
  119                 error = openprom_node_valid(node);
  120                 if (error != 0)
  121                         break;
  122                 switch (cmd) {
  123                 case OPROMCHILD:
  124                         node = OF_child(node);
  125                         break;
  126                 case OPROMNEXT:
  127                         node = OF_peer(node);
  128                         break;
  129                 }
  130                 error = copyout(&node, &oprom->oprom_array, sizeof(node));
  131                 if (error != 0)
  132                         break;
  133                 openprom_node = node;
  134                 break;
  135         case OPROMGETPROP:
  136         case OPROMNXTPROP:
  137                 error = copyin(&oprom->oprom_size, &len, sizeof(len));
  138                 if (error != 0)
  139                         break;
  140                 if (len > OPROMMAXPARAM) {
  141                         error = EINVAL;
  142                         break;
  143                 }
  144                 prop = malloc(len, M_TEMP, M_WAITOK | M_ZERO);
  145                 error = copyinstr(&oprom->oprom_array, prop, len, &done);
  146                 if (error != 0)
  147                         break;
  148                 buf = malloc(OPROMMAXPARAM, M_TEMP, M_WAITOK | M_ZERO);
  149                 node = openprom_node;
  150                 switch (cmd) {
  151                 case OPROMGETPROP:
  152                         proplen = OF_getproplen(node, prop);
  153                         if (proplen > OPROMMAXPARAM) {
  154                                 error = EINVAL;
  155                                 break;
  156                         }
  157                         error = OF_getprop(node, prop, buf, proplen);
  158                         break;
  159                 case OPROMNXTPROP:
  160                         error = OF_nextprop(node, prop, buf);
  161                         proplen = strlen(buf);
  162                         break;
  163                 }
  164                 if (error != -1) {
  165                         error = copyout(&proplen, &oprom->oprom_size,
  166                             sizeof(proplen));
  167                         if (error == 0)
  168                                 error = copyout(buf, &oprom->oprom_array,
  169                                     proplen + 1);
  170                 } else
  171                         error = EINVAL;
  172                 free(prop, M_TEMP);
  173                 free(buf, M_TEMP);
  174                 break;
  175         default:
  176                 error = ENOIOCTL;
  177                 break;
  178         }
  179         return (error);
  180 }
  181 
  182 static int
  183 openprom_node_valid(phandle_t node)
  184 {
  185 
  186         if (node == 0)
  187                 return (0);
  188         return (openprom_node_search(OF_peer(0), node));
  189 }
  190 
  191 static int
  192 openprom_node_search(phandle_t root, phandle_t node)
  193 {
  194         phandle_t child;
  195 
  196         if (root == node)
  197                 return (0);
  198         for (child = OF_child(root); child != 0 && child != -1;
  199             child = OF_peer(child))
  200                 if (openprom_node_search(child, node) == 0)
  201                         return (0);
  202         return (EINVAL);
  203 }
  204 
  205 static int
  206 openprom_modevent(module_t mode, int type, void *data)
  207 {
  208 
  209         switch (type) {
  210         case MOD_LOAD:
  211                 openprom_dev = make_dev(&openprom_cdevsw, 0, UID_ROOT,
  212                     GID_WHEEL, 0600, "openprom");
  213                 return (0);
  214         case MOD_UNLOAD:
  215                 destroy_dev(openprom_dev);
  216                 return (0);
  217         default:
  218                 return (EOPNOTSUPP);
  219         }
  220 }
  221 
  222 DEV_MODULE(openprom, openprom_modevent, NULL);

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FreeBSD/Linux Kernel Cross Reference sys/dev/ofw/openpromio.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/ofw/openpromio.c