root/arch/um/kernel/early_printk.c
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2011 Richard Weinberger <richrd@nod.at>
 */

#include <linux/kernel.h>
#include <linux/console.h>
#include <linux/init.h>
#include <os.h>

static void early_console_write(struct console *con, const char *s, unsigned int n)
{
        um_early_printk(s, n);
}

static struct console early_console_dev = {
        .name = "earlycon",
        .write = early_console_write,
        .flags = CON_BOOT,
        .index = -1,
};

static int __init setup_early_printk(char *buf)
{
        if (!early_console) {
                early_console = &early_console_dev;
                register_console(&early_console_dev);
        }
        return 0;
}

early_param("earlyprintk", setup_early_printk);