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/*
* Copyright (c) 2017 Richard Braun.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdbool.h>
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include <kern/arg.h>
#include <kern/assert.h>
#include <kern/init.h>
#include <kern/console.h>
#include <kern/list.h>
#include <kern/spinlock.h>
/*
* Registered consoles.
*/
static struct list console_devs;
/*
* Active console device.
*/
static struct console *console_dev;
static const char *console_name __initdata;
static bool __init
console_name_match(const char *name)
{
if (console_name == NULL) {
return true;
}
return (strcmp(console_name, name) == 0);
}
void __init
console_init(struct console *console, const char *name,
console_putc_fn putc)
{
spinlock_init(&console->lock);
console->putc = putc;
strlcpy(console->name, name, sizeof(console->name));
}
static void
console_putc(struct console *console, char c)
{
unsigned long flags;
spinlock_lock_intr_save(&console->lock, &flags);
console->putc(console, c);
spinlock_unlock_intr_restore(&console->lock, flags);
}
void __init
console_setup(void)
{
list_init(&console_devs);
console_name = arg_value("console");
}
void __init
console_register(struct console *console)
{
list_insert_tail(&console_devs, &console->node);
if ((console_dev == NULL) && console_name_match(console->name)) {
console_dev = console;
}
printf("console: %s registered\n", console->name);
if (console == console_dev) {
printf("console: %s selected as active console\n", console->name);
}
}
void
console_write_char(char c)
{
if (console_dev == NULL) {
return;
}
console_putc(console_dev, c);
}
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