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
  10 static int found(u64 start, u64 end, void *data)
  11 {
  12         return 1;
  13 }
  14
  15 static __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 }
  32 device_initcall(register_e820_pmem);