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(struct resource *res, 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); 33