arch/tile/kernel/early_printk.c

   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
  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
  44 void early_panic(const char *fmt, ...)
  45 {
  46         va_list ap;
  47         arch_local_irq_disable_all();
  48         va_start(ap, fmt);
  49         early_printk("Kernel panic - not syncing: ");
  50         early_vprintk(fmt, ap);
  51         early_printk("\n");
  52         va_end(ap);
  53         dump_stack();
  54         hv_halt();
  55 }
  56
  57 static int __init setup_early_printk(char *str)
  58 {
  59         if (early_console)
  60                 return 1;
  61
  62         early_console = &early_hv_console;
  63         register_console(early_console);
  64
  65         return 0;
  66 }
  67
  68 early_param("earlyprintk", setup_early_printk);