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