1/*
 2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
 3 *
 4 *   This program is free software; you can redistribute it and/or
 5 *   modify it under the terms of the GNU General Public License
 6 *   as published by the Free Software Foundation, version 2.
 7 *
 8 *   This program is distributed in the hope that it will be useful, but
 9 *   WITHOUT ANY WARRANTY; without even the implied warranty of
10 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11 *   NON INFRINGEMENT.  See the GNU General Public License for
12 *   more details.
13 */
14
15#include <linux/console.h>
16#include <linux/kernel.h>
17#include <linux/init.h>
18#include <linux/string.h>
19#include <linux/irqflags.h>
20#include <linux/printk.h>
21#include <asm/setup.h>
22#include <hv/hypervisor.h>
23
24static void early_hv_write(struct console *con, const char *s, unsigned n)
25{
26	tile_console_write(s, n);
27
28	/*
29	 * Convert NL to NLCR (close enough to CRNL) during early boot.
30	 * We assume newlines are at the ends of strings, which turns out
31	 * to be good enough for early boot console output.
32	 */
33	if (n && s[n-1] == '\n')
34		tile_console_write("\r", 1);
35}
36
37static struct console early_hv_console = {
38	.name =		"earlyhv",
39	.write =	early_hv_write,
40	.flags =	CON_PRINTBUFFER | CON_BOOT,
41	.index =	-1,
42};
43
44void early_panic(const char *fmt, ...)
45{
46	struct va_format vaf;
47	va_list args;
48
49	arch_local_irq_disable_all();
50
51	va_start(args, fmt);
52
53	vaf.fmt = fmt;
54	vaf.va = &args;
55
56	early_printk("Kernel panic - not syncing: %pV", &vaf);
57
58	va_end(args);
59
60	dump_stack();
61	hv_halt();
62}
63
64static int __init setup_early_printk(char *str)
65{
66	if (early_console)
67		return 1;
68
69	early_console = &early_hv_console;
70	register_console(early_console);
71
72	return 0;
73}
74
75early_param("earlyprintk", setup_early_printk);