usr/src/boot/sys/boot/ofw/libofw/devicename.c

   1 /*
   2  * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
   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 #include <sys/cdefs.h>
  28
  29 #include <stand.h>
  30
  31 #include "bootstrap.h"
  32 #include "libofw.h"
  33 #include "../zfs/libzfs.h"
  34
  35 static int ofw_parsedev(struct ofw_devdesc **, const char *, const char **);
  36
  37 /*
  38  * Point (dev) at an allocated device specifier for the device matching the
  39  * path in (devspec). If it contains an explicit device specification,
  40  * use that.  If not, use the default device.
  41  */
  42 int
  43 ofw_getdev(void **vdev, const char *devspec, const char **path)
  44 {
  45     struct ofw_devdesc **dev = (struct ofw_devdesc **)vdev;
  46     int                         rv;
  47
  48     /*
  49      * If it looks like this is just a path and no
  50      * device, go with the current device.
  51      */
  52     if ((devspec == NULL) ||
  53         ((strchr(devspec, '@') == NULL) &&
  54         (strchr(devspec, ':') == NULL))) {
  55
  56         if (((rv = ofw_parsedev(dev, getenv("currdev"), NULL)) == 0) &&
  57             (path != NULL))
  58                 *path = devspec;
  59         return(rv);
  60     }
  61
  62     /*
  63      * Try to parse the device name off the beginning of the devspec
  64      */
  65     return(ofw_parsedev(dev, devspec, path));
  66 }
  67
  68 /*
  69  * Point (dev) at an allocated device specifier matching the string version
  70  * at the beginning of (devspec).  Return a pointer to the remaining
  71  * text in (path).
  72  */
  73 static int
  74 ofw_parsedev(struct ofw_devdesc **dev, const char *devspec, const char **path)
  75 {
  76     struct ofw_devdesc  *idev;
  77     struct devsw        *dv;
  78     phandle_t           handle;
  79     const char          *p;
  80     const char          *s;
  81     char                *ep;
  82     char                name[256];
  83     char                type[64];
  84     int                 err;
  85     int                 len;
  86     int                 i;
  87
  88     for (p = s = devspec; *s != '\0'; p = s) {
  89         if ((s = strchr(p + 1, '/')) == NULL)
  90             s = strchr(p, '\0');
  91         len = s - devspec;
  92         bcopy(devspec, name, len);
  93         name[len] = '\0';
  94         if ((handle = OF_finddevice(name)) == -1) {
  95             bcopy(name, type, len);
  96             type[len] = '\0';
  97         } else if (OF_getprop(handle, "device_type", type, sizeof(type)) == -1)
  98             continue;
  99         for (i = 0; (dv = devsw[i]) != NULL; i++) {
 100             if (strncmp(dv->dv_name, type, strlen(dv->dv_name)) == 0)
 101                 goto found;
 102         }
 103     }
 104     return(ENOENT);
 105
 106 found:
 107     if (path != NULL)
 108         *path = s;
 109     idev = malloc(sizeof(struct ofw_devdesc));
 110     if (idev == NULL) {
 111         printf("ofw_parsedev: malloc failed\n");
 112         return ENOMEM;
 113     }
 114     strcpy(idev->d_path, name);
 115     idev->dd.d_dev = dv;
 116     idev->dd.d_type = dv->dv_type;
 117     if (idev->dd.d_type == DEVT_ZFS) {
 118         p = devspec + strlen(dv->dv_name);
 119         err = zfs_parsedev((struct zfs_devdesc *)idev, p, path);
 120         if (err != 0) {
 121             free(idev);
 122             return (err);
 123         }
 124     }
 125
 126     if (dev == NULL) {
 127         free(idev);
 128     } else {
 129         *dev = idev;
 130     }
 131     return(0);
 132 }
 133
 134 int
 135 ofw_setcurrdev(struct env_var *ev, int flags, const void *value)
 136 {
 137     struct ofw_devdesc  *ncurr;
 138     int                 rv;
 139
 140     if ((rv = ofw_parsedev(&ncurr, value, NULL)) != 0)
 141         return rv;
 142
 143     free(ncurr);
 144     env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL);
 145     return 0;
 146 }