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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memconsole.c (1238B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * memconsole.c
      4 *
      5 * Architecture-independent parts of the memory based BIOS console.
      6 *
      7 * Copyright 2017 Google Inc.
      8 */
      9
     10#include <linux/sysfs.h>
     11#include <linux/kobject.h>
     12#include <linux/module.h>
     13
     14#include "memconsole.h"
     15
     16static ssize_t memconsole_read(struct file *filp, struct kobject *kobp,
     17			       struct bin_attribute *bin_attr, char *buf,
     18			       loff_t pos, size_t count)
     19{
     20	ssize_t (*memconsole_read_func)(char *, loff_t, size_t);
     21
     22	memconsole_read_func = bin_attr->private;
     23	if (WARN_ON_ONCE(!memconsole_read_func))
     24		return -EIO;
     25
     26	return memconsole_read_func(buf, pos, count);
     27}
     28
     29static struct bin_attribute memconsole_bin_attr = {
     30	.attr = {.name = "log", .mode = 0444},
     31	.read = memconsole_read,
     32};
     33
     34void memconsole_setup(ssize_t (*read_func)(char *, loff_t, size_t))
     35{
     36	memconsole_bin_attr.private = read_func;
     37}
     38EXPORT_SYMBOL(memconsole_setup);
     39
     40int memconsole_sysfs_init(void)
     41{
     42	return sysfs_create_bin_file(firmware_kobj, &memconsole_bin_attr);
     43}
     44EXPORT_SYMBOL(memconsole_sysfs_init);
     45
     46void memconsole_exit(void)
     47{
     48	sysfs_remove_bin_file(firmware_kobj, &memconsole_bin_attr);
     49}
     50EXPORT_SYMBOL(memconsole_exit);
     51
     52MODULE_AUTHOR("Google, Inc.");
     53MODULE_LICENSE("GPL");