1 /* $NetBSD: mkdevsw.c,v 1.15 2016/07/16 07:13:26 pgoyette Exp $ */ 2 3 /* 4 * Copyright (c) 2002 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by MAEKAWA Masahide (gehenna@NetBSD.org). 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #if HAVE_NBTOOL_CONFIG_H 33 #include "nbtool_config.h" 34 #endif 35 36 #include <sys/cdefs.h> 37 __RCSID("$NetBSD: mkdevsw.c,v 1.15 2016/07/16 07:13:26 pgoyette Exp $"); 38 39 #include <stdio.h> 40 #include <string.h> 41 #include <errno.h> 42 #include <err.h> 43 44 #include "defs.h" 45 46 static void emitconv(FILE *); 47 static void emitdev(FILE *); 48 static void emitdevm(FILE *); 49 static void emitheader(FILE *); 50 51 int 52 mkdevsw(void) 53 { 54 FILE *fp; 55 56 if ((fp = fopen("devsw.c.tmp", "w")) == NULL) { 57 warn("cannot create devsw.c"); 58 return (1); 59 } 60 61 emitheader(fp); 62 emitdevm(fp); 63 emitconv(fp); 64 emitdev(fp); 65 66 fflush(fp); 67 if (ferror(fp)) { 68 warn("error writing devsw.c"); 69 fclose(fp); 70 return 1; 71 } 72 73 (void)fclose(fp); 74 75 if (moveifchanged("devsw.c.tmp", "devsw.c") != 0) { 76 warn("error renaming devsw.c"); 77 return (1); 78 } 79 80 return (0); 81 } 82 83 static void 84 emitheader(FILE *fp) 85 { 86 autogen_comment(fp, "devsw.c"); 87 88 fputs("#include <sys/param.h>\n" 89 "#include <sys/conf.h>\n", fp); 90 } 91 92 static void 93 dentry(FILE *fp, struct hashtab *t, devmajor_t i, char p) 94 { 95 const struct devm *dm; 96 char mstr[16]; 97 98 (void)snprintf(mstr, sizeof(mstr), "%d", i); 99 if ((dm = ht_lookup(t, intern(mstr))) == NULL) 100 return; 101 102 fprintf(fp, "extern const struct %cdevsw %s_%cdevsw;\n", 103 p, dm->dm_name, p); 104 } 105 106 static void 107 pentry(FILE *fp, struct hashtab *t, devmajor_t i, char p) 108 { 109 const struct devm *dm; 110 char mstr[16]; 111 112 (void)snprintf(mstr, sizeof(mstr), "%d", i); 113 dm = ht_lookup(t, intern(mstr)); 114 115 if (dm) 116 fprintf(fp, "\t&%s_%cdevsw", dm->dm_name, p); 117 else 118 fputs("\tNULL", fp); 119 120 fprintf(fp, ",\t// %3d\n", i); 121 } 122 123 /* 124 * Emit device switch table for character/block device. 125 */ 126 static void 127 emitdevm(FILE *fp) 128 { 129 devmajor_t i; 130 131 fputs("\n/* device switch table for block device */\n", fp); 132 133 for (i = 0; i <= maxbdevm ; i++) 134 dentry(fp, bdevmtab, i, 'b'); 135 136 fputs("\nconst struct bdevsw *bdevsw0[] = {\n", fp); 137 138 for (i = 0; i <= maxbdevm; i++) 139 pentry(fp, bdevmtab, i, 'b'); 140 141 fputs("};\n\nconst struct bdevsw **bdevsw = bdevsw0;\n", fp); 142 143 fputs("const int sys_bdevsws = __arraycount(bdevsw0);\n" 144 "int max_bdevsws = __arraycount(bdevsw0);\n", fp); 145 146 fputs("\n/* device switch table for character device */\n", fp); 147 148 for (i = 0; i <= maxcdevm; i++) 149 dentry(fp, cdevmtab, i, 'c'); 150 151 fputs("\nconst struct cdevsw *cdevsw0[] = {\n", fp); 152 153 for (i = 0; i <= maxcdevm; i++) 154 pentry(fp, cdevmtab, i, 'c'); 155 156 fputs("};\n\nconst struct cdevsw **cdevsw = cdevsw0;\n", fp); 157 158 fputs("const int sys_cdevsws = __arraycount(cdevsw0);\n" 159 "int max_cdevsws = __arraycount(cdevsw0);\n", fp); 160 } 161 162 /* 163 * Emit device major conversion table. 164 */ 165 static void 166 emitconv(FILE *fp) 167 { 168 struct devm *dm; 169 170 fputs("\n/* device conversion table */\n" 171 "struct devsw_conv devsw_conv0[] = {\n", fp); 172 TAILQ_FOREACH(dm, &alldevms, dm_next) { 173 if (version < 20100430) { 174 /* Emit compatible structure */ 175 fprintf(fp, "\t{ \"%s\", %d, %d },\n", dm->dm_name, 176 dm->dm_bmajor, dm->dm_cmajor); 177 continue; 178 } 179 struct nvlist *nv; 180 const char *d_class, *d_flags = "0"; 181 int d_vec[2] = { 0, 0 }; 182 int i = 0; 183 184 /* 185 * "parse" info. currently the rules are simple: 186 * 1) first entry defines class 187 * 2) next ones without n_str are d_vectdim 188 * 3) next one with n_str is d_flags 189 * 4) EOL 190 */ 191 nv = dm->dm_devnodes; 192 d_class = nv->nv_str; 193 while ((nv = nv->nv_next) != NULL) { 194 if (i > 2) 195 panic("invalid devnode definition"); 196 if (nv->nv_str) { 197 d_flags = nv->nv_str; 198 break; 199 } 200 if (nv->nv_num > INT_MAX || nv->nv_num < INT_MIN) 201 panic("out of range devnode definition"); 202 d_vec[i++] = (int)nv->nv_num; 203 } 204 205 fprintf(fp, "\t{ \"%s\", %d, %d, %s, %s, { %d, %d }},\n", 206 dm->dm_name, dm->dm_bmajor, dm->dm_cmajor, 207 d_class, d_flags, d_vec[0], d_vec[1]); 208 209 } 210 fputs("};\n\n" 211 "struct devsw_conv *devsw_conv = devsw_conv0;\n" 212 "int max_devsw_convs = __arraycount(devsw_conv0);\n", 213 fp); 214 } 215 216 /* 217 * Emit specific device major informations. 218 */ 219 static void 220 emitdev(FILE *fp) 221 { 222 struct devm *dm; 223 char mstr[16]; 224 225 fputs("\n", fp); 226 227 (void)strlcpy(mstr, "swap", sizeof(mstr)); 228 if ((dm = ht_lookup(bdevmtab, intern(mstr))) != NULL) { 229 fprintf(fp, "const dev_t swapdev = makedev(%d, 0);\n", 230 dm->dm_bmajor); 231 } 232 233 (void)strlcpy(mstr, "mem", sizeof(mstr)); 234 if ((dm = ht_lookup(cdevmtab, intern(mstr))) == NULL) 235 panic("memory device is not configured"); 236 fprintf(fp, "const dev_t zerodev = makedev(%d, DEV_ZERO);\n", 237 dm->dm_cmajor); 238 239 fputs("\n/* mem_no is only used in iskmemdev() */\n", fp); 240 fprintf(fp, "const int mem_no = %d;\n", dm->dm_cmajor); 241 } 242