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 __FBSDID("$FreeBSD$"); 29 30 #include <stand.h> 31 #include <string.h> 32 33 #include "bootstrap.h" 34 /* 35 * Core console support 36 */ 37 38 static int cons_set(struct env_var *ev, int flags, const void *value); 39 static int cons_find(const char *name); 40 static int cons_check(const char *string); 41 static int cons_change(const char *string); 42 static int twiddle_set(struct env_var *ev, int flags, const void *value); 43 44 /* 45 * Detect possible console(s) to use. If preferred console(s) have been 46 * specified, mark them as active. Else, mark the first probed console 47 * as active. Also create the console variable. 48 */ 49 void 50 cons_probe(void) 51 { 52 int cons; 53 int active; 54 char *prefconsole; 55 56 /* We want a callback to install the new value when this var changes. */ 57 env_setenv("twiddle_divisor", EV_VOLATILE, "1", twiddle_set, env_nounset); 58 59 /* Do all console probes */ 60 for (cons = 0; consoles[cons] != NULL; cons++) { 61 consoles[cons]->c_flags = 0; 62 consoles[cons]->c_probe(consoles[cons]); 63 } 64 /* Now find the first working one */ 65 active = -1; 66 for (cons = 0; consoles[cons] != NULL && active == -1; cons++) { 67 consoles[cons]->c_flags = 0; 68 consoles[cons]->c_probe(consoles[cons]); 69 if (consoles[cons]->c_flags == (C_PRESENTIN | C_PRESENTOUT)) 70 active = cons; 71 } 72 /* Force a console even if all probes failed */ 73 if (active == -1) 74 active = 0; 75 76 /* Check to see if a console preference has already been registered */ 77 prefconsole = getenv("console"); 78 if (prefconsole != NULL) 79 prefconsole = strdup(prefconsole); 80 if (prefconsole != NULL) { 81 unsetenv("console"); /* we want to replace this */ 82 cons_change(prefconsole); 83 } else { 84 consoles[active]->c_flags |= C_ACTIVEIN | C_ACTIVEOUT; 85 consoles[active]->c_init(0); 86 prefconsole = strdup(consoles[active]->c_name); 87 } 88 89 printf("Consoles: "); 90 for (cons = 0; consoles[cons] != NULL; cons++) 91 if (consoles[cons]->c_flags & (C_ACTIVEIN | C_ACTIVEOUT)) 92 printf("%s ", consoles[cons]->c_desc); 93 printf("\n"); 94 95 if (prefconsole != NULL) { 96 env_setenv("console", EV_VOLATILE, prefconsole, cons_set, 97 env_nounset); 98 free(prefconsole); 99 } 100 } 101 102 int 103 getchar(void) 104 { 105 int cons; 106 int rv; 107 108 /* Loop forever polling all active consoles */ 109 for(;;) 110 for (cons = 0; consoles[cons] != NULL; cons++) 111 if ((consoles[cons]->c_flags & (C_PRESENTIN | C_ACTIVEIN)) == 112 (C_PRESENTIN | C_ACTIVEIN) && 113 ((rv = consoles[cons]->c_in()) != -1)) 114 return(rv); 115 } 116 117 int 118 ischar(void) 119 { 120 int cons; 121 122 for (cons = 0; consoles[cons] != NULL; cons++) 123 if ((consoles[cons]->c_flags & (C_PRESENTIN | C_ACTIVEIN)) == 124 (C_PRESENTIN | C_ACTIVEIN) && 125 (consoles[cons]->c_ready() != 0)) 126 return(1); 127 return(0); 128 } 129 130 void 131 putchar(int c) 132 { 133 int cons; 134 135 /* Expand newlines */ 136 if (c == '\n') 137 putchar('\r'); 138 139 for (cons = 0; consoles[cons] != NULL; cons++) 140 if ((consoles[cons]->c_flags & (C_PRESENTOUT | C_ACTIVEOUT)) == 141 (C_PRESENTOUT | C_ACTIVEOUT)) 142 consoles[cons]->c_out(c); 143 } 144 145 /* 146 * Find the console with the specified name. 147 */ 148 static int 149 cons_find(const char *name) 150 { 151 int cons; 152 153 for (cons = 0; consoles[cons] != NULL; cons++) 154 if (!strcmp(consoles[cons]->c_name, name)) 155 return (cons); 156 return (-1); 157 } 158 159 /* 160 * Select one or more consoles. 161 */ 162 static int 163 cons_set(struct env_var *ev, int flags, const void *value) 164 { 165 int ret; 166 167 if ((value == NULL) || (cons_check(value) == 0)) { 168 /* 169 * Return CMD_OK instead of CMD_ERROR to prevent forth syntax error, 170 * which would prevent it processing any further loader.conf entries. 171 */ 172 return (CMD_OK); 173 } 174 175 ret = cons_change(value); 176 if (ret != CMD_OK) 177 return (ret); 178 179 env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL); 180 return (CMD_OK); 181 } 182 183 /* 184 * Check that at least one the consoles listed in *string is valid 185 */ 186 static int 187 cons_check(const char *string) 188 { 189 int cons, found, failed; 190 char *curpos, *dup, *next; 191 192 dup = next = strdup(string); 193 found = failed = 0; 194 while (next != NULL) { 195 curpos = strsep(&next, " ,"); 196 if (*curpos != '\0') { 197 cons = cons_find(curpos); 198 if (cons == -1) { 199 printf("console %s is invalid!\n", curpos); 200 failed++; 201 } else { 202 found++; 203 } 204 } 205 } 206 207 free(dup); 208 209 if (found == 0) 210 printf("no valid consoles!\n"); 211 212 if (found == 0 || failed != 0) { 213 printf("Available consoles:\n"); 214 for (cons = 0; consoles[cons] != NULL; cons++) 215 printf(" %s\n", consoles[cons]->c_name); 216 } 217 218 return (found); 219 } 220 221 /* 222 * Activate all the valid consoles listed in *string and disable all others. 223 */ 224 static int 225 cons_change(const char *string) 226 { 227 int cons, active; 228 char *curpos, *dup, *next; 229 230 /* Disable all consoles */ 231 for (cons = 0; consoles[cons] != NULL; cons++) { 232 consoles[cons]->c_flags &= ~(C_ACTIVEIN | C_ACTIVEOUT); 233 } 234 235 /* Enable selected consoles */ 236 dup = next = strdup(string); 237 active = 0; 238 while (next != NULL) { 239 curpos = strsep(&next, " ,"); 240 if (*curpos == '\0') 241 continue; 242 cons = cons_find(curpos); 243 if (cons >= 0) { 244 consoles[cons]->c_flags |= C_ACTIVEIN | C_ACTIVEOUT; 245 consoles[cons]->c_init(0); 246 if ((consoles[cons]->c_flags & (C_PRESENTIN | C_PRESENTOUT)) == 247 (C_PRESENTIN | C_PRESENTOUT)) { 248 active++; 249 continue; 250 } 251 252 if (active != 0) { 253 /* If no consoles have initialised we wouldn't see this. */ 254 printf("console %s failed to initialize\n", consoles[cons]->c_name); 255 } 256 } 257 } 258 259 free(dup); 260 261 if (active == 0) { 262 /* All requested consoles failed to initialise, try to recover. */ 263 for (cons = 0; consoles[cons] != NULL; cons++) { 264 consoles[cons]->c_flags |= C_ACTIVEIN | C_ACTIVEOUT; 265 consoles[cons]->c_init(0); 266 if ((consoles[cons]->c_flags & 267 (C_PRESENTIN | C_PRESENTOUT)) == 268 (C_PRESENTIN | C_PRESENTOUT)) 269 active++; 270 } 271 272 if (active == 0) 273 return (CMD_ERROR); /* Recovery failed. */ 274 } 275 276 return (CMD_OK); 277 } 278 279 /* 280 * Change the twiddle divisor. 281 * 282 * The user can set the twiddle_divisor variable to directly control how fast 283 * the progress twiddle spins, useful for folks with slow serial consoles. The 284 * code to monitor changes to the variable and propagate them to the twiddle 285 * routines has to live somewhere. Twiddling is console-related so it's here. 286 */ 287 static int 288 twiddle_set(struct env_var *ev, int flags, const void *value) 289 { 290 u_long tdiv; 291 char * eptr; 292 293 tdiv = strtoul(value, &eptr, 0); 294 if (*(const char *)value == 0 || *eptr != 0) { 295 printf("invalid twiddle_divisor '%s'\n", (const char *)value); 296 return (CMD_ERROR); 297 } 298 twiddle_divisor((u_int)tdiv); 299 env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL); 300 301 return(CMD_OK); 302 } 303