projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
| Commit | Line | Data |
|---|---|---|
| 93fd03a8 CM |
1 | /* |
| 2 | * linux/arch/arm/kernel/early_printk.c | |
| 3 | * | |
| 4 | * Copyright (C) 2009 Sascha Hauer <s.hauer@pengutronix.de> | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or modify | |
| 7 | * it under the terms of the GNU General Public License version 2 as | |
| 8 | * published by the Free Software Foundation. | |
| 9 | */ | |
| 10 | ||
| 11 | #include <linux/kernel.h> | |
| 12 | #include <linux/console.h> | |
| 13 | #include <linux/init.h> | |
| 14 | ||
| 15 | extern void printch(int); | |
| 16 | ||
| 17 | static void early_write(const char *s, unsigned n) | |
| 18 | { | |
| 19 | while (n-- > 0) { | |
| 20 | if (*s == '\n') | |
| 21 | printch('\r'); | |
| 22 | printch(*s); | |
| 23 | s++; | |
| 24 | } | |
| 25 | } | |
| 26 | ||
| 27 | static void early_console_write(struct console *con, const char *s, unsigned n) | |
| 28 | { | |
| 29 | early_write(s, n); | |
| 30 | } | |
| 31 | ||
| 32 | static struct console early_console = { | |
| 33 | .name = "earlycon", | |
| 34 | .write = early_console_write, | |
| 35 | .flags = CON_PRINTBUFFER | CON_BOOT, | |
| 36 | .index = -1, | |
| 37 | }; | |
| 38 | ||
| 39 | asmlinkage void early_printk(const char *fmt, ...) | |
| 40 | { | |
| 41 | char buf[512]; | |
| 42 | int n; | |
| 43 | va_list ap; | |
| 44 | ||
| 45 | va_start(ap, fmt); | |
| 46 | n = vscnprintf(buf, sizeof(buf), fmt, ap); | |
| 47 | early_write(buf, n); | |
| 48 | va_end(ap); | |
| 49 | } | |
| 50 | ||
| 51 | static int __init setup_early_printk(char *buf) | |
| 52 | { | |
| 53 | register_console(&early_console); | |
| 54 | return 0; | |
| 55 | } | |
| 56 | ||
| 57 | early_param("earlyprintk", setup_early_printk); |