early_printk.c (7913ad1ad83409e7f9ed5758bb4324bf64c95a73) early_printk.c (c46f46d02c90959b82b99badfadc575081666aae)
1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (c) 2014 Finn Thain
7 */
8
9#include <linux/kernel.h>
10#include <linux/console.h>
11#include <linux/init.h>
12#include <linux/string.h>
13#include <asm/setup.h>
14
1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (c) 2014 Finn Thain
7 */
8
9#include <linux/kernel.h>
10#include <linux/console.h>
11#include <linux/init.h>
12#include <linux/string.h>
13#include <asm/setup.h>
14
15extern void mvme16x_cons_write(struct console *co,
16 const char *str, unsigned count);
17
15asmlinkage void __init debug_cons_nputs(const char *s, unsigned n);
16
18asmlinkage void __init debug_cons_nputs(const char *s, unsigned n);
19
17static void debug_cons_write(struct console *c,
18 const char *s, unsigned n)
20static void __ref debug_cons_write(struct console *c,
21 const char *s, unsigned n)
19{
22{
20 debug_cons_nputs(s, n);
23#if !(defined(CONFIG_SUN3) || defined(CONFIG_M68360) || \
24 defined(CONFIG_M68000) || defined(CONFIG_COLDFIRE))
25 if (MACH_IS_MVME16x)
26 mvme16x_cons_write(c, s, n);
27 else
28 debug_cons_nputs(s, n);
29#endif
21}
22
23static struct console early_console_instance = {
24 .name = "debug",
25 .write = debug_cons_write,
26 .flags = CON_PRINTBUFFER | CON_BOOT,
27 .index = -1
28};
29
30static int __init setup_early_printk(char *buf)
31{
30}
31
32static struct console early_console_instance = {
33 .name = "debug",
34 .write = debug_cons_write,
35 .flags = CON_PRINTBUFFER | CON_BOOT,
36 .index = -1
37};
38
39static int __init setup_early_printk(char *buf)
40{
32 /* MVME16x registers an early console after interrupt setup. */
33 if (MACH_IS_MVME16x)
34 return 0;
35
36 if (early_console || buf)
37 return 0;
38
39 early_console = &early_console_instance;
40 register_console(early_console);
41
42 return 0;
43}
44early_param("earlyprintk", setup_early_printk);
45
46/*
47 * debug_cons_nputs() defined in arch/m68k/kernel/head.S cannot be called
48 * after init sections are discarded (for platforms that use it).
49 */
50#if !(defined(CONFIG_SUN3) || defined(CONFIG_M68360) || \
51 defined(CONFIG_M68000) || defined(CONFIG_COLDFIRE))
52
53static int __init unregister_early_console(void)
54{
41 if (early_console || buf)
42 return 0;
43
44 early_console = &early_console_instance;
45 register_console(early_console);
46
47 return 0;
48}
49early_param("earlyprintk", setup_early_printk);
50
51/*
52 * debug_cons_nputs() defined in arch/m68k/kernel/head.S cannot be called
53 * after init sections are discarded (for platforms that use it).
54 */
55#if !(defined(CONFIG_SUN3) || defined(CONFIG_M68360) || \
56 defined(CONFIG_M68000) || defined(CONFIG_COLDFIRE))
57
58static int __init unregister_early_console(void)
59{
55 if (!early_console)
60 if (!early_console || MACH_IS_MVME16x)
56 return 0;
57
58 return unregister_console(early_console);
59}
60late_initcall(unregister_early_console);
61
62#endif
61 return 0;
62
63 return unregister_console(early_console);
64}
65late_initcall(unregister_early_console);
66
67#endif