1 /*
2 * DECstation PROM-based early console support.
3 *
4 * Copyright (C) 2004, 2007 Maciej W. Rozycki
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11 #include <linux/console.h>
12 #include <linux/init.h>
13 #include <linux/kernel.h>
14 #include <linux/string.h>
15
16 #include <asm/dec/prom.h>
17
prom_console_write(struct console * con,const char * s,unsigned int c)18 static void __init prom_console_write(struct console *con, const char *s,
19 unsigned int c)
20 {
21 char buf[81];
22 unsigned int chunk = sizeof(buf) - 1;
23
24 while (c > 0) {
25 if (chunk > c)
26 chunk = c;
27 memcpy(buf, s, chunk);
28 buf[chunk] = '\0';
29 prom_printf("%s", buf);
30 s += chunk;
31 c -= chunk;
32 }
33 }
34
35 static struct console promcons __initdata = {
36 .name = "prom",
37 .write = prom_console_write,
38 .flags = CON_BOOT | CON_PRINTBUFFER,
39 .index = -1,
40 };
41
register_prom_console(void)42 void __init register_prom_console(void)
43 {
44 register_console(&promcons);
45 }
46