1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *	DECstation PROM-based early console support.
4  *
5  *	Copyright (C) 2004, 2007  Maciej W. Rozycki
6  */
7 #include <linux/console.h>
8 #include <linux/init.h>
9 #include <linux/kernel.h>
10 #include <linux/string.h>
11 
12 #include <asm/dec/prom.h>
13 
prom_console_write(struct console * con,const char * s,unsigned int c)14 static void __init prom_console_write(struct console *con, const char *s,
15 				      unsigned int c)
16 {
17 	char buf[81];
18 	unsigned int chunk = sizeof(buf) - 1;
19 
20 	while (c > 0) {
21 		if (chunk > c)
22 			chunk = c;
23 		memcpy(buf, s, chunk);
24 		buf[chunk] = '\0';
25 		prom_printf("%s", buf);
26 		s += chunk;
27 		c -= chunk;
28 	}
29 }
30 
31 static struct console promcons __initdata = {
32 	.name	= "prom",
33 	.write	= prom_console_write,
34 	.flags	= CON_BOOT | CON_PRINTBUFFER,
35 	.index	= -1,
36 };
37 
register_prom_console(void)38 void __init register_prom_console(void)
39 {
40 	register_console(&promcons);
41 }
42