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
early_hv_write(struct console * con,const char * s,unsigned n)24 static 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
37 static struct console early_hv_console = {
38 .name = "earlyhv",
39 .write = early_hv_write,
40 .flags = CON_PRINTBUFFER | CON_BOOT,
41 .index = -1,
42 };
43
early_panic(const char * fmt,...)44 void 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
setup_early_printk(char * str)64 static 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
75 early_param("earlyprintk", setup_early_printk);
76