cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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early_printk.c (1600B)

      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
     15extern void mvme16x_cons_write(struct console *co,
     16			       const char *str, unsigned count);
     17
     18asmlinkage void __init debug_cons_nputs(const char *s, unsigned n);
     19
     20static 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
     32static struct console early_console_instance = {
     33	.name  = "debug",
     34	.write = debug_cons_write,
     35	.flags = CON_PRINTBUFFER | CON_BOOT,
     36	.index = -1
     37};
     38
     39static 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}
     49early_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
     58static 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}
     65late_initcall(unregister_early_console);
     66
     67#endif