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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 | 2 | /* |
1da177e4 LT |
3 | * DECstation PROM-based early console support. |
4 | * | |
36de48de | 5 | * Copyright (C) 2004, 2007 Maciej W. Rozycki |
1da177e4 LT |
6 | */ |
7 | #include <linux/console.h> | |
8 | #include <linux/init.h> | |
9 | #include <linux/kernel.h> | |
36de48de | 10 | #include <linux/string.h> |
1da177e4 LT |
11 | |
12 | #include <asm/dec/prom.h> | |
13 | ||
36de48de MR |
14 | static void __init prom_console_write(struct console *con, const char *s, |
15 | unsigned int c) | |
1da177e4 | 16 | { |
36de48de MR |
17 | char buf[81]; |
18 | unsigned int chunk = sizeof(buf) - 1; | |
1da177e4 | 19 | |
36de48de MR |
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 | }; | |
1da177e4 | 37 | |
36de48de MR |
38 | void __init register_prom_console(void) |
39 | { | |
40 | register_console(&promcons); | |
1da177e4 | 41 | } |