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Linux/arch/m68k/kernel/early_printk.c

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  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 
 15 extern void mvme16x_cons_write(struct console *co,
 16                                const char *str, unsigned count);
 17 
 18 asmlinkage void __init debug_cons_nputs(const char *s, unsigned n);
 19 
 20 static void __ref debug_cons_write(struct console *c,
 21                                    const char *s, unsigned n)
 22 {
 23 #if !(defined(CONFIG_SUN3) || defined(CONFIG_M68000) || \
 24       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
 30 }
 31 
 32 static struct console early_console_instance = {
 33         .name  = "debug",
 34         .write = debug_cons_write,
 35         .flags = CON_PRINTBUFFER | CON_BOOT,
 36         .index = -1
 37 };
 38 
 39 static int __init setup_early_printk(char *buf)
 40 {
 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 }
 49 early_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_M68000) || \
 56       defined(CONFIG_COLDFIRE))
 57 
 58 static int __init unregister_early_console(void)
 59 {
 60         if (!early_console || MACH_IS_MVME16x)
 61                 return 0;
 62 
 63         return unregister_console(early_console);
 64 }
 65 late_initcall(unregister_early_console);
 66 
 67 #endif
 68 

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