GNU Linux-libre 4.14.266-gnu1
[releases.git] / 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);