console.c

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/*
 *  DECstation PROM-based early console support.
 *
 *  Copyright (C) 2004, 2007  Maciej W. Rozycki
 *
 *  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
 *  2 of the License, or (at your option) any later version.
 */
#include <linux/console.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/string.h>

#include <asm/dec/prom.h>

static void __init prom_console_write(struct console *con, const char *s,
                      unsigned int c)
{
    char buf[81];
    unsigned int chunk = sizeof(buf) - 1;

    while (c > 0) {
        if (chunk > c)
            chunk = c;
        memcpy(buf, s, chunk);
        buf[chunk] = '\0';
        prom_printf("%s", buf);
        s += chunk;
        c -= chunk;
    }
}

static struct console promcons __initdata = {
    .name   = "prom",
    .write  = prom_console_write,
    .flags  = CON_BOOT | CON_PRINTBUFFER,
    .index  = -1,
};

void __init register_prom_console(void)
{
    register_console(&promcons);
}