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 1.8 1995/12/21 20:09:39 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 #include <sys/vnode.h> 41 42 #define NUMCDEV 96 43 #define NUMBDEV 32 44 45 struct bdevsw *bdevsw[NUMBDEV]; 46 int nblkdev = NUMBDEV; 47 struct cdevsw *cdevsw[NUMCDEV]; 48 int nchrdev = NUMCDEV; 49 50 51 52 /* 53 * Routine to determine if a device is a disk. 54 * 55 * KLUDGE XXX add flags to cdevsw entries for disks XXX 56 * A minimal stub routine can always return 0. 57 */ 58 int 59 isdisk(dev, type) 60 dev_t dev; 61 int type; 62 { 63 64 switch (major(dev)) { 65 case 15: /* VBLK: vn, VCHR: cd */ 66 return (1); 67 case 0: /* wd */ 68 case 2: /* fd */ 69 case 4: /* sd */ 70 case 6: /* cd */ 71 case 7: /* mcd */ 72 case 16: /* scd */ 73 case 17: /* matcd */ 74 case 18: /* ata */ 75 case 19: /* wcd */ 76 case 20: /* od */ 77 if (type == VBLK) 78 return (1); 79 return (0); 80 case 3: /* wd */ 81 case 9: /* fd */ 82 case 13: /* sd */ 83 case 29: /* mcd */ 84 case 43: /* vn */ 85 case 45: /* scd */ 86 case 46: /* matcd */ 87 case 69: /* wcd */ 88 case 70: /* od */ 89 if (type == VCHR) 90 return (1); 91 /* fall through */ 92 default: 93 return (0); 94 } 95 /* NOTREACHED */ 96 } 97 98 99 /* 100 * Routine to convert from character to block device number. 101 * 102 * A minimal stub routine can always return NODEV. 103 */ 104 dev_t 105 chrtoblk(dev_t dev) 106 { 107 struct bdevsw *bd; 108 struct cdevsw *cd; 109 110 if(cd = cdevsw[major(dev)]) { 111 if ( (bd = cd->d_bdev) ) 112 return(makedev(bd->d_maj,minor(dev))); 113 } 114 return(NODEV); 115 } 116 117 /* 118 * (re)place an entry in the bdevsw or cdevsw table 119 * return the slot used in major(*descrip) 120 */ 121 #define ADDENTRY(TTYPE,NXXXDEV) \ 122 int TTYPE##_add(dev_t *descrip, \ 123 struct TTYPE *newentry, \ 124 struct TTYPE **oldentry) \ 125 { \ 126 int i ; \ 127 if ( (int)*descrip == -1) { /* auto (0 is valid) */ \ 128 /* \ 129 * Search the table looking for a slot... \ 130 */ \ 131 for (i = 0; i < NXXXDEV; i++) \ 132 if (TTYPE[i] == NULL) \ 133 break; /* found one! */ \ 134 /* out of allocable slots? */ \ 135 if (i == NXXXDEV) { \ 136 return ENFILE; \ 137 } \ 138 } else { /* assign */ \ 139 i = major(*descrip); \ 140 if (i < 0 || i >= NXXXDEV) { \ 141 return EINVAL; \ 142 } \ 143 } \ 144 \ 145 /* maybe save old */ \ 146 if (oldentry) { \ 147 *oldentry = TTYPE[i]; \ 148 } \ 149 newentry->d_maj = i; \ 150 /* replace with new */ \ 151 TTYPE[i] = newentry; \ 152 \ 153 /* done! let them know where we put it */ \ 154 *descrip = makedev(i,0); \ 155 return 0; \ 156 } \ 157 158 ADDENTRY(bdevsw, nblkdev) 159 ADDENTRY(cdevsw, nchrdev) 160