/* $NetBSD: console.c,v 1.3 2009/07/20 04:59:03 kiyohara Exp $ */
/*-
* Copyright (c) 1998 Michael Smith <
[email protected]>
* 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.
*/
#include <sys/cdefs.h>
/* __FBSDID("$FreeBSD: src/sys/boot/common/console.c,v 1.6 2003/08/25 23:30:41 obrien Exp $"); */
#include <lib/libsa/stand.h>
#include <lib/libsa/loadfile.h>
#include <lib/libkern/libkern.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;
char *prefconsole;
/* Do all console probes */
for (cons = 0; consoles[cons] != NULL; cons++) {
consoles[cons]->c_flags = 0;
consoles[cons]->c_probe(consoles[cons]);
}
/* Now find the first working one */
active = -1;
for (cons = 0; consoles[cons] != NULL && active == -1; cons++) {
consoles[cons]->c_flags = 0;
consoles[cons]->c_probe(consoles[cons]);
if (consoles[cons]->c_flags == (C_PRESENTIN | C_PRESENTOUT))
active = cons;
}
/* Check to see if a console preference has already been registered */
prefconsole = getenv("console");
if (prefconsole != NULL)
prefconsole = strdup(prefconsole);
if (prefconsole != NULL) {
unsetenv("console"); /* we want to replace this */
for (cons = 0; consoles[cons] != NULL; cons++)
/* look for the nominated console, use it if it's functional */
if (!strcmp(prefconsole, consoles[cons]->c_name) &&
(consoles[cons]->c_flags == (C_PRESENTIN | C_PRESENTOUT)))
active = cons;
free(prefconsole);
}
if (active == -1)
active = 0;
consoles[active]->c_flags |= (C_ACTIVEIN | C_ACTIVEOUT);
consoles[active]->c_init(0);
printf("Console: %s\n", consoles[active]->c_desc);
env_setenv("console", EV_VOLATILE, consoles[active]->c_name, (ev_sethook_t *) 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 ((value == NULL) || ((active = cons_find(value)) == -1)) {
if (value != NULL)
printf("no such console '%s'\n", (char *)value);
printf("Available consoles:\n");
for (cons = 0; consoles[cons] != NULL; cons++)
printf(" %s\n", consoles[cons]->c_name);
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;
consoles[active]->c_init(0);
env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL);
return(CMD_OK);
}
