mirror of
https://github.com/freebsd/freebsd-src
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181 lines
4.5 KiB
C
181 lines
4.5 KiB
C
/*-
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* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include <stand.h>
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#include <string.h>
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#include "bootstrap.h"
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#include "disk.h"
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#include "libuboot.h"
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static int uboot_parsedev(struct uboot_devdesc **dev, const char *devspec,
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const char **path);
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/*
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* Point (dev) at an allocated device specifier for the device matching the
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* path in (devspec). If it contains an explicit device specification,
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* use that. If not, use the default device.
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*/
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int
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uboot_getdev(void **vdev, const char *devspec, const char **path)
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{
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struct uboot_devdesc **dev = (struct uboot_devdesc **)vdev;
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int rv;
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/*
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* If it looks like this is just a path and no
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* device, go with the current device.
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*/
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if ((devspec == NULL) || (devspec[0] == '/') ||
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(strchr(devspec, ':') == NULL)) {
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if (((rv = uboot_parsedev(dev, getenv("currdev"), NULL)) == 0)
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&& (path != NULL))
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*path = devspec;
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return(rv);
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}
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/*
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* Try to parse the device name off the beginning of the devspec.
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*/
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return (uboot_parsedev(dev, devspec, path));
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}
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/*
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* Point (dev) at an allocated device specifier matching the string version
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* at the beginning of (devspec). Return a pointer to the remaining
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* text in (path).
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*
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* In all cases, the beginning of (devspec) is compared to the names
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* of known devices in the device switch, and then any following text
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* is parsed according to the rules applied to the device type.
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*
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* For disk-type devices, the syntax is:
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*
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* disk<unit>[<partition>]:
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*
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*/
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static int
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uboot_parsedev(struct uboot_devdesc **dev, const char *devspec,
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const char **path)
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{
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struct uboot_devdesc *idev;
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struct devsw *dv;
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char *cp;
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const char *np;
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int i, unit, err;
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/* minimum length check */
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if (strlen(devspec) < 2)
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return(EINVAL);
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/* look for a device that matches */
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for (i = 0, dv = NULL; devsw[i] != NULL; i++) {
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if (!strncmp(devspec, devsw[i]->dv_name,
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strlen(devsw[i]->dv_name))) {
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dv = devsw[i];
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break;
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}
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}
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if (dv == NULL)
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return(ENOENT);
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idev = malloc(sizeof(struct uboot_devdesc));
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err = 0;
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np = (devspec + strlen(dv->dv_name));
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switch(dv->dv_type) {
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case DEVT_NONE:
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break;
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#ifdef LOADER_DISK_SUPPORT
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case DEVT_DISK:
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free(idev);
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err = disk_parsedev((struct devdesc **)&idev, devspec, path);
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if (err != 0)
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goto fail;
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break;
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#endif
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case DEVT_NET:
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unit = 0;
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if (*np && (*np != ':')) {
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/* get unit number if present */
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unit = strtol(np, &cp, 0);
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if (cp == np) {
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err = EUNIT;
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goto fail;
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}
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}
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if (*cp && (*cp != ':')) {
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err = EINVAL;
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goto fail;
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}
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idev->dd.d_unit = unit;
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if (path != NULL)
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*path = (*cp == 0) ? cp : cp + 1;
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break;
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default:
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err = EINVAL;
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goto fail;
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}
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idev->dd.d_dev = dv;
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/*
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* dev can be NULL, since uboot_getdev calls us directly, rather than via
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* dv_parsedev in devparse() which otherwise ensures that it can't be NULL.
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*/
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if (dev == NULL) {
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free(idev);
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} else {
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*dev = idev;
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}
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return (0);
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fail:
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free(idev);
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return (err);
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}
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/*
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* Set currdev to suit the value being supplied in (value).
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*/
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int
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uboot_setcurrdev(struct env_var *ev, int flags, const void *value)
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{
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struct uboot_devdesc *ncurr;
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int rv;
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if ((rv = uboot_parsedev(&ncurr, value, NULL)) != 0)
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return (rv);
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free(ncurr);
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return (mount_currdev(ev, flags, value));
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}
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