arch/x86/kernel/pmem.c

   1 /*
   2  * Copyright (c) 2015, Christoph Hellwig.
   3  * Copyright (c) 2015, Intel Corporation.
   4  */
   5 #include <linux/platform_device.h>
   6 #include <linux/module.h>
   7 #include <linux/ioport.h>
   8
   9 static int found(u64 start, u64 end, void *data)
  10 {
  11         return 1;
  12 }
  13
  14 static __init int register_e820_pmem(void)
  15 {
  16         struct platform_device *pdev;
  17         int rc;
  18
  19         rc = walk_iomem_res_desc(IORES_DESC_PERSISTENT_MEMORY_LEGACY,
  20                                  IORESOURCE_MEM, 0, -1, NULL, found);
  21         if (rc <= 0)
  22                 return 0;
  23
  24         /*
  25          * See drivers/nvdimm/e820.c for the implementation, this is
  26          * simply here to trigger the module to load on demand.
  27          */
  28         pdev = platform_device_alloc("e820_pmem", -1);
  29         return platform_device_add(pdev);
  30 }
  31 device_initcall(register_e820_pmem);