1/* $NetBSD: console.c,v 1.2 2006/04/22 07:58:53 cherry Exp $ */ 2 3/*- 4 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29#include <sys/cdefs.h> 30/* __FBSDID("$FreeBSD: src/sys/boot/common/console.c,v 1.6 2003/08/25 23:30:41 obrien Exp $"); */ 31 32#include <lib/libsa/stand.h> 33#include <lib/libsa/loadfile.h> 34#include <lib/libkern/libkern.h> 35 36#include "bootstrap.h" 37/* 38 * Core console support 39 */ 40 41static int cons_set(struct env_var *ev, int flags, void *value); 42static int cons_find(char *name); 43 44/* 45 * Detect possible console(s) to use. The first probed console 46 * is marked active. Also create the console variable. 47 * 48 * XXX Add logic for multiple console support. 49 */ 50void 51cons_probe(void) 52{ 53 int cons; 54 int active; 55 char *prefconsole; 56 57 /* Do all console probes */ 58 for (cons = 0; consoles[cons] != NULL; cons++) { 59 consoles[cons]->c_flags = 0; 60 consoles[cons]->c_probe(consoles[cons]); 61 } 62 /* Now find the first working one */ 63 active = -1; 64 for (cons = 0; consoles[cons] != NULL && active == -1; cons++) { 65 consoles[cons]->c_flags = 0; 66 consoles[cons]->c_probe(consoles[cons]); 67 if (consoles[cons]->c_flags == (C_PRESENTIN | C_PRESENTOUT)) 68 active = cons; 69 } 70 71 /* Check to see if a console preference has already been registered */ 72 prefconsole = getenv("console"); 73 if (prefconsole != NULL) 74 prefconsole = strdup(prefconsole); 75 if (prefconsole != NULL) { 76 unsetenv("console"); /* we want to replace this */ 77 for (cons = 0; consoles[cons] != NULL; cons++) 78 /* look for the nominated console, use it if it's functional */ 79 if (!strcmp(prefconsole, consoles[cons]->c_name) && 80 (consoles[cons]->c_flags == (C_PRESENTIN | C_PRESENTOUT))) 81 active = cons; 82 free(prefconsole); 83 } 84 if (active == -1) 85 active = 0; 86 consoles[active]->c_flags |= (C_ACTIVEIN | C_ACTIVEOUT); 87 consoles[active]->c_init(0); 88 89 printf("Console: %s\n", consoles[active]->c_desc); 90 env_setenv("console", EV_VOLATILE, consoles[active]->c_name, (ev_sethook_t *) cons_set, 91 env_nounset); 92} 93 94int 95getchar(void) 96{ 97 int cons; 98 int rv; 99 100 /* Loop forever polling all active consoles */ 101 for(;;) 102 for (cons = 0; consoles[cons] != NULL; cons++) 103 if ((consoles[cons]->c_flags & C_ACTIVEIN) && 104 ((rv = consoles[cons]->c_in()) != -1)) 105 return(rv); 106} 107 108int 109ischar(void) 110{ 111 int cons; 112 113 for (cons = 0; consoles[cons] != NULL; cons++) 114 if ((consoles[cons]->c_flags & C_ACTIVEIN) && 115 (consoles[cons]->c_ready() != 0)) 116 return(1); 117 return(0); 118} 119 120void 121putchar(int c) 122{ 123 int cons; 124 125 /* Expand newlines */ 126 if (c == '\n') 127 putchar('\r'); 128 129 for (cons = 0; consoles[cons] != NULL; cons++) 130 if (consoles[cons]->c_flags & C_ACTIVEOUT) 131 consoles[cons]->c_out(c); 132} 133 134static int 135cons_find(char *name) 136{ 137 int cons; 138 139 for (cons = 0; consoles[cons] != NULL; cons++) 140 if (!strcmp(consoles[cons]->c_name, name)) 141 return(cons); 142 return(-1); 143} 144 145 146/* 147 * Select a console. 148 * 149 * XXX Note that the console system design allows for some extension 150 * here (eg. multiple consoles, input/output only, etc.) 151 */ 152static int 153cons_set(struct env_var *ev, int flags, void *value) 154{ 155 int cons, active; 156 157 if ((value == NULL) || ((active = cons_find(value)) == -1)) { 158 if (value != NULL) 159 printf("no such console '%s'\n", (char *)value); 160 printf("Available consoles:\n"); 161 for (cons = 0; consoles[cons] != NULL; cons++) 162 printf(" %s\n", consoles[cons]->c_name); 163 return(CMD_ERROR); 164 } 165 166 /* disable all current consoles */ 167 for (cons = 0; consoles[cons] != NULL; cons++) 168 consoles[cons]->c_flags &= ~(C_ACTIVEIN | C_ACTIVEOUT); 169 170 /* enable selected console */ 171 consoles[active]->c_flags |= C_ACTIVEIN | C_ACTIVEOUT; 172 consoles[active]->c_init(0); 173 174 env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL); 175 return(CMD_OK); 176} 177