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/*
* memconsole.c
*
* Architecture-independent parts of the memory based BIOS console.
*
* Copyright 2017 Google Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License v2.0 as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/init.h>
#include <linux/sysfs.h>
#include <linux/kobject.h>
#include <linux/module.h>
#include "memconsole.h"
static char *memconsole_baseaddr;
static size_t memconsole_length;
static ssize_t memconsole_read(struct file *filp, struct kobject *kobp,
struct bin_attribute *bin_attr, char *buf,
loff_t pos, size_t count)
{
return memory_read_from_buffer(buf, count, &pos, memconsole_baseaddr,
memconsole_length);
}
static struct bin_attribute memconsole_bin_attr = {
.attr = {.name = "log", .mode = 0444},
.read = memconsole_read,
};
void memconsole_setup(void *baseaddr, size_t length)
{
memconsole_baseaddr = baseaddr;
memconsole_length = length;
}
EXPORT_SYMBOL(memconsole_setup);
int memconsole_sysfs_init(void)
{
memconsole_bin_attr.size = memconsole_length;
return sysfs_create_bin_file(firmware_kobj, &memconsole_bin_attr);
}
EXPORT_SYMBOL(memconsole_sysfs_init);
void memconsole_exit(void)
{
sysfs_remove_bin_file(firmware_kobj, &memconsole_bin_attr);
}
EXPORT_SYMBOL(memconsole_exit);
MODULE_AUTHOR("Google, Inc.");
MODULE_LICENSE("GPL");
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