1 /*- 2 * Parts Copyright (c) 1995 Terrence R. Lambert 3 * Copyright (c) 1995 Julian R. Elischer 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Terrence R. Lambert. 17 * 4. The name Terrence R. Lambert may not be used to endorse or promote 18 * products derived from this software without specific prior written 19 * permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY Julian R. Elischer ``AS IS'' AND ANY 22 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE TERRENCE R. LAMBERT BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * $Id: kern_conf.c,v 1.2 1995/10/02 10:15:40 julian Exp $ 34 */ 35 36 #include <sys/param.h> 37 #include <sys/types.h> 38 #include <sys/systm.h> 39 #include <sys/conf.h> 40 extern d_open_t lkmenodev; 41 42 /* 43 * (re)place an entry in the bdevsw or cdevsw table 44 * return the slot used in major(*descrip) 45 */ 46 #define ADDENTRY(TTYPE,NXXXDEV) \ 47 int TTYPE##_add(dev_t *descrip, \ 48 struct TTYPE *newentry, \ 49 struct TTYPE *oldentry) \ 50 { \ 51 int i ; \ 52 if ( (int)*descrip == -1) { /* auto (0 is valid) */ \ 53 /* \ 54 * Search the table looking for a slot... \ 55 */ \ 56 for (i = 0; i < NXXXDEV; i++) \ 57 if (TTYPE[i].d_open == lkmenodev) \ 58 break; /* found it! */ \ 59 /* out of allocable slots? */ \ 60 if (i == NXXXDEV) { \ 61 return ENFILE; \ 62 } \ 63 } else { /* assign */ \ 64 i = major(descrip); \ 65 if (i < 0 || i >= NXXXDEV) { \ 66 return EINVAL; \ 67 } \ 68 } \ 69 \ 70 /* maybe save old */ \ 71 if (oldentry) { \ 72 bcopy(&TTYPE[i], oldentry, sizeof(struct TTYPE)); \ 73 } \ 74 /* replace with new */ \ 75 bcopy(newentry, &TTYPE[i], sizeof(struct TTYPE)); \ 76 \ 77 /* done! */ \ 78 *descrip = makedev(i,0); \ 79 return 0; \ 80 } \ 81 82 ADDENTRY(bdevsw, nblkdev) 83 ADDENTRY(cdevsw, nchrdev) 84