projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 28bab059 G |
1 | /* |
| 2 | * linux/arch/unicore32/kernel/early_printk.c | |
| 3 | * | |
| 4 | * Code specific to PKUnity SoC and UniCore ISA | |
| 5 | * | |
| 6 | * Copyright (C) 2001-2010 GUAN Xue-tao | |
| 7 | * | |
| 8 | * This program is free software; you can redistribute it and/or modify | |
| 9 | * it under the terms of the GNU General Public License version 2 as | |
| 10 | * published by the Free Software Foundation. | |
| 11 | */ | |
| 12 | #include <linux/console.h> | |
| 13 | #include <linux/init.h> | |
| 14 | #include <linux/string.h> | |
| 15 | #include <mach/ocd.h> | |
| 16 | ||
| 17 | /* On-Chip-Debugger functions */ | |
| 18 | ||
| 19 | static void early_ocd_write(struct console *con, const char *s, unsigned n) | |
| 20 | { | |
| 21 | while (*s && n-- > 0) { | |
| 22 | if (*s == '\n') | |
| 23 | ocd_putc((int)'\r'); | |
| 24 | ocd_putc((int)*s); | |
| 25 | s++; | |
| 26 | } | |
| 27 | } | |
| 28 | ||
| 29 | static struct console early_ocd_console = { | |
| 30 | .name = "earlyocd", | |
| 31 | .write = early_ocd_write, | |
| 32 | .flags = CON_PRINTBUFFER, | |
| 33 | .index = -1, | |
| 34 | }; | |
| 35 | ||
| 36 | /* Direct interface for emergencies */ | |
| 37 | static struct console *early_console = &early_ocd_console; | |
| 38 | ||
| 39 | static int __initdata keep_early; | |
| 40 | ||
| 41 | static int __init setup_early_printk(char *buf) | |
| 42 | { | |
| 43 | if (!buf) | |
| 44 | return 0; | |
| 45 | ||
| 46 | if (strstr(buf, "keep")) | |
| 47 | keep_early = 1; | |
| 48 | ||
| 49 | if (!strncmp(buf, "ocd", 3)) | |
| 50 | early_console = &early_ocd_console; | |
| 51 | ||
| 52 | if (keep_early) | |
| 53 | early_console->flags &= ~CON_BOOT; | |
| 54 | else | |
| 55 | early_console->flags |= CON_BOOT; | |
| 56 | register_console(early_console); | |
| 57 | return 0; | |
| 58 | } | |
| 59 | early_param("earlyprintk", setup_early_printk); |