linux/drivers/firmware/google/memconsole-x86-legacy.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * memconsole-x86-legacy.c
 *
 * EBDA specific parts of the memory based BIOS console.
 *
 * Copyright 2017 Google Inc.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/dmi.h>
#include <linux/mm.h>
#include <asm/bios_ebda.h>
#include <linux/acpi.h>

#include "memconsole.h"

#define BIOS_MEMCONSOLE_V1_MAGIC …
#define BIOS_MEMCONSOLE_V2_MAGIC …

struct biosmemcon_ebda { … } __packed;

static char *memconsole_baseaddr;
static size_t memconsole_length;

static ssize_t memconsole_read(char *buf, loff_t pos, size_t count)
{ … }

static void found_v1_header(struct biosmemcon_ebda *hdr)
{ … }

static void found_v2_header(struct biosmemcon_ebda *hdr)
{ … }

/*
 * Search through the EBDA for the BIOS Memory Console, and
 * set the global variables to point to it.  Return true if found.
 */
static bool memconsole_ebda_init(void)
{ … }

static const struct dmi_system_id memconsole_dmi_table[] __initconst = …;
MODULE_DEVICE_TABLE(dmi, memconsole_dmi_table);

static bool __init memconsole_find(void)
{ … }

static int __init memconsole_x86_init(void)
{ … }

static void __exit memconsole_x86_exit(void)
{ … }

module_init(…) …;
module_exit(memconsole_x86_exit);

MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;