LXR linux/arch/tile/kernel/early

   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
  24static 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
  37static struct console early_hv_console = {
  38        .name =         "earlyhv",
  39        .write =        early_hv_write,
  40        .flags =        CON_PRINTBUFFER | CON_BOOT,
  41        .index =        -1,
  42};
  43
  44void 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
  57static 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
  68early_param("earlyprintk", setup_early_printk);
  69