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 __FBSDID("$FreeBSD$"); 29 30 #include <stand.h> 31 32 #include "bootstrap.h" 33 #include "libofw.h" 34 35 /* 36 * Point (dev) at an allocated device specifier for the device matching the 37 * path in (devspec). If it contains an explicit device specification, 38 * use that. If not, use the default device. 39 */ 40 int 41 ofw_getdev(void **vdev, const char *devspec, const char **path) 42 { 43 struct devdesc **dev = (struct devdesc **)vdev; 44 int rv; 45 46 /* 47 * If it looks like this is just a path and no device, go with the 48 * current device. 49 */ 50 if (devspec == NULL || strpbrk(devspec, ":@") == NULL) { 51 rv = devparse(dev, getenv("currdev"), NULL); 52 if (rv == 0 && path != NULL) 53 *path = devspec; 54 return (rv); 55 } 56 57 /* 58 * Try to parse the device name off the beginning of the devspec 59 */ 60 return (devparse(dev, devspec, path)); 61 } 62 63 /* 64 * Search the OFW (path) for a node that's of (want_type). 65 */ 66 phandle_t 67 ofw_path_to_handle(const char *ofwpath, const char *want_type, const char **path) 68 { 69 const char *p, *s; 70 char name[256]; 71 char type[64]; 72 phandle_t handle; 73 int len; 74 75 for (p = s = ofwpath; *s != '\0'; p = s) { 76 if ((s = strchr(p + 1, '/')) == NULL) 77 s = strchr(p, '\0'); 78 len = s - ofwpath; 79 if (len >= sizeof(name)) 80 return ((phandle_t)-1); 81 bcopy(ofwpath, name, len); 82 name[len] = '\0'; 83 if ((handle = OF_finddevice(name)) == -1) 84 continue; 85 if (OF_getprop(handle, "device_type", type, sizeof(type)) == -1) 86 continue; 87 if (strcmp(want_type, type) == 0) { 88 *path = s; 89 return (handle); 90 } 91 } 92 return ((phandle_t)-1); 93 } 94 95 int 96 ofw_common_parsedev(struct devdesc **dev, const char *devspec, const char **path, 97 const char *ofwtype) 98 { 99 const char *rem_path; 100 struct ofw_devdesc *idev; 101 102 if (ofw_path_to_handle(devspec, ofwtype, &rem_path) == -1) 103 return (ENOENT); 104 idev = malloc(sizeof(struct ofw_devdesc)); 105 if (idev == NULL) { 106 printf("ofw_parsedev: malloc failed\n"); 107 return ENOMEM; 108 }; 109 strlcpy(idev->d_path, devspec, min(rem_path - devspec + 1, 110 sizeof(idev->d_path))); 111 *dev = &idev->dd; 112 if (path != NULL) 113 *path = rem_path; 114 return 0; 115 } 116