LXR linux/arch/x86/kernel/pmem.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Copyright (c) 2015, Christoph Hellwig.
   4 * Copyright (c) 2015, Intel Corporation.
   5 */
   6#include <linux/platform_device.h>
   7#include <linux/init.h>
   8#include <linux/ioport.h>
   9
  10static int found(struct resource *res, void *data)
  11{
  12        return 1;
  13}
  14
  15static __init int register_e820_pmem(void)
  16{
  17        struct platform_device *pdev;
  18        int rc;
  19
  20        rc = walk_iomem_res_desc(IORES_DESC_PERSISTENT_MEMORY_LEGACY,
  21                                 IORESOURCE_MEM, 0, -1, NULL, found);
  22        if (rc <= 0)
  23                return 0;
  24
  25        /*
  26         * See drivers/nvdimm/e820.c for the implementation, this is
  27         * simply here to trigger the module to load on demand.
  28         */
  29        pdev = platform_device_alloc("e820_pmem", -1);
  30        return platform_device_add(pdev);
  31}
  32device_initcall(register_e820_pmem);
  33