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 * $FreeBSD: src/sys/boot/common/devopen.c,v 1.4 2003/08/25 23:30:41 obrien Exp $ 27 * $DragonFly: src/sys/boot/common/devopen.c,v 1.3 2003/11/10 06:08:31 dillon Exp $ 28 */ 29 30 #include <stand.h> 31 #include <string.h> 32 33 #include "bootstrap.h" 34 35 /* 36 * Install f_dev and f_devinfo. Some devices uses the generic 37 * devdesc, others will replace it with their own and clear F_DEVDESC. 38 */ 39 int 40 devopen(struct open_file *f, const char *fname, const char **file) 41 { 42 struct devdesc *dev; 43 int result; 44 45 if ((result = archsw.arch_getdev((void *)&dev, fname, file)) == 0) { /* get the device */ 46 /* point to device-specific data so that device open can use it */ 47 f->f_flags |= F_DEVDESC; 48 f->f_devdata = dev; 49 if ((result = dev->d_dev->dv_open(f, dev)) == 0) { /* try to open it */ 50 /* reference the devsw entry from the open_file structure */ 51 f->f_dev = dev->d_dev; 52 } else { 53 devclose(f); 54 } 55 } 56 return(result); 57 } 58 59 int 60 devclose(struct open_file *f) 61 { 62 if (f->f_flags & F_DEVDESC) { 63 if (f->f_devdata != NULL) { 64 free(f->f_devdata); 65 f->f_devdata = NULL; 66 } 67 f->f_flags &= ~F_DEVDESC; 68 } 69 return(0); 70 } 71 72 void 73 devreplace(struct open_file *f, void *devdata) 74 { 75 if (f->f_flags & F_DEVDESC) { 76 free(f->f_devdata); 77 f->f_flags &= ~F_DEVDESC; 78 } 79 f->f_devdata = devdata; 80 } 81