1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * DECstation PROM-based early console support.
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2004, 2007 Maciej W. Rozycki
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun #include <linux/console.h>
8*4882a593Smuzhiyun #include <linux/init.h>
9*4882a593Smuzhiyun #include <linux/kernel.h>
10*4882a593Smuzhiyun #include <linux/string.h>
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #include <asm/dec/prom.h>
13*4882a593Smuzhiyun
prom_console_write(struct console * con,const char * s,unsigned int c)14*4882a593Smuzhiyun static void __init prom_console_write(struct console *con, const char *s,
15*4882a593Smuzhiyun unsigned int c)
16*4882a593Smuzhiyun {
17*4882a593Smuzhiyun char buf[81];
18*4882a593Smuzhiyun unsigned int chunk = sizeof(buf) - 1;
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun while (c > 0) {
21*4882a593Smuzhiyun if (chunk > c)
22*4882a593Smuzhiyun chunk = c;
23*4882a593Smuzhiyun memcpy(buf, s, chunk);
24*4882a593Smuzhiyun buf[chunk] = '\0';
25*4882a593Smuzhiyun prom_printf("%s", buf);
26*4882a593Smuzhiyun s += chunk;
27*4882a593Smuzhiyun c -= chunk;
28*4882a593Smuzhiyun }
29*4882a593Smuzhiyun }
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun static struct console promcons __initdata = {
32*4882a593Smuzhiyun .name = "prom",
33*4882a593Smuzhiyun .write = prom_console_write,
34*4882a593Smuzhiyun .flags = CON_BOOT | CON_PRINTBUFFER,
35*4882a593Smuzhiyun .index = -1,
36*4882a593Smuzhiyun };
37*4882a593Smuzhiyun
register_prom_console(void)38*4882a593Smuzhiyun void __init register_prom_console(void)
39*4882a593Smuzhiyun {
40*4882a593Smuzhiyun register_console(&promcons);
41*4882a593Smuzhiyun }
42