linux/arch/x86/kernel/check.c

// SPDX-License-Identifier: GPL-2.0

#define pr_fmt(fmt) …

#include <linux/init.h>
#include <linux/sched.h>
#include <linux/kthread.h>
#include <linux/workqueue.h>
#include <linux/memblock.h>

#include <asm/proto.h>
#include <asm/setup.h>

/*
 * Some BIOSes seem to corrupt the low 64k of memory during events
 * like suspend/resume and unplugging an HDMI cable.  Reserve all
 * remaining free memory in that area and fill it with a distinct
 * pattern.
 */
#define MAX_SCAN_AREAS …

static int __read_mostly memory_corruption_check = …;

static unsigned __read_mostly corruption_check_size = …;
static unsigned __read_mostly corruption_check_period = …; /* seconds */

static struct scan_area { … } scan_areas[MAX_SCAN_AREAS];
static int num_scan_areas;

static __init int set_corruption_check(char *arg)
{ … }
early_param(…);

static __init int set_corruption_check_period(char *arg)
{ … }
early_param(…);

static __init int set_corruption_check_size(char *arg)
{ … }
early_param(…);


void __init setup_bios_corruption_check(void)
{ … }


static void check_for_bios_corruption(void)
{ … }

static void check_corruption(struct work_struct *dummy);
static DECLARE_DELAYED_WORK(bios_check_work, check_corruption);

static void check_corruption(struct work_struct *dummy)
{ … }

static int start_periodic_check_for_corruption(void)
{ … }
device_initcall(start_periodic_check_for_corruption);