diff options
Diffstat (limited to 'sys/boot/common/console.c')
| -rw-r--r-- | sys/boot/common/console.c | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/sys/boot/common/console.c b/sys/boot/common/console.c new file mode 100644 index 0000000..5aed8b1 --- /dev/null +++ b/sys/boot/common/console.c @@ -0,0 +1,142 @@ +/*- + * Copyright (c) 1998 Michael Smith <msmith@freebsd.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $Id$ + */ + +#include <stand.h> +#include <string.h> + +#include "bootstrap.h" +/* + * Core console support + */ + +static int cons_set(struct env_var *ev, int flags, void *value); +static int cons_find(char *name); + +/* + * Detect possible console(s) to use. The first probed console + * is marked active. Also create the console variable. + * + * XXX Add logic for multiple console support. + */ +void +cons_probe(void) +{ + int cons; + int active; + + /* Do all console probes, make the fist fully functional console active */ + for (cons = 0, active = -1; consoles[cons] != NULL; cons++) { + consoles[cons]->c_flags = 0; + consoles[cons]->c_probe(consoles[cons]); + if ((consoles[cons]->c_flags == (C_PRESENTIN | C_PRESENTOUT)) && (active == -1)) { + consoles[cons]->c_flags |= (C_ACTIVEIN | C_ACTIVEOUT); + active = cons; + } + } + printf("Console: %s\n", consoles[active]->c_desc); + env_setenv("console", 0, consoles[active]->c_name, cons_set, env_nounset); +} + +int +getchar(void) +{ + int cons; + int rv; + + /* Loop forever polling all active consoles */ + for(;;) + for (cons = 0; consoles[cons] != NULL; cons++) + if ((consoles[cons]->c_flags & C_ACTIVEIN) && + ((rv = consoles[cons]->c_in()) != -1)) + return(rv); +} + +int +ischar(void) +{ + int cons; + + for (cons = 0; consoles[cons] != NULL; cons++) + if ((consoles[cons]->c_flags & C_ACTIVEIN) && + (consoles[cons]->c_ready() != 0)) + return(1); + return(0); +} + +void +putchar(int c) +{ + int cons; + + /* Expand newlines */ + if (c == '\n') + putchar('\r'); + + for (cons = 0; consoles[cons] != NULL; cons++) + if (consoles[cons]->c_flags & C_ACTIVEOUT) + consoles[cons]->c_out(c); +} + +static int +cons_find(char *name) +{ + int cons; + + for (cons = 0; consoles[cons] != NULL; cons++) + if (!strcmp(consoles[cons]->c_name, name)) + return(cons); + return(-1); +} + + +/* + * Select a console. + * + * XXX Note that the console system design allows for some extension + * here (eg. multiple consoles, input/output only, etc.) + */ +static int +cons_set(struct env_var *ev, int flags, void *value) +{ + int cons, active; + + if ((active = cons_find(value)) == -1) { + printf("no such console '%s'\n", (char *)value); + return(CMD_ERROR); + } + + /* disable all current consoles */ + for (cons = 0; consoles[cons] != NULL; cons++) + consoles[cons]->c_flags &= ~(C_ACTIVEIN | C_ACTIVEOUT); + + /* enable selected console */ + consoles[active]->c_flags |= C_ACTIVEIN | C_ACTIVEOUT; + + env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL); + return(CMD_OK); +} |
