| 1 | // SPDX-License-Identifier: GPL-2.0 |
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| 2 | /* |
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| 3 | * Copyright (c) 2015, Christoph Hellwig. |
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| 4 | * Copyright (c) 2015, Intel Corporation. |
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| 5 | */ |
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| 6 | #include <linux/platform_device.h> |
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| 7 | #include <linux/init.h> |
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| 8 | #include <linux/ioport.h> |
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| 9 | |
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| 10 | static int found(struct resource *res, void *data) |
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| 11 | { |
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| 12 | return 1; |
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| 13 | } |
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| 14 | |
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| 15 | static __init int register_e820_pmem(void) |
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| 16 | { |
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| 17 | struct platform_device *pdev; |
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| 18 | int rc; |
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| 19 | |
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| 20 | rc = walk_iomem_res_desc(desc: IORES_DESC_PERSISTENT_MEMORY_LEGACY, |
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| 21 | IORESOURCE_MEM, start: 0, end: -1, NULL, func: found); |
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| 22 | if (rc <= 0) |
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| 23 | return 0; |
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| 24 | |
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| 25 | /* |
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| 26 | * See drivers/nvdimm/e820.c for the implementation, this is |
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| 27 | * simply here to trigger the module to load on demand. |
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| 28 | */ |
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| 29 | pdev = platform_device_alloc(name: "e820_pmem" , id: -1); |
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| 30 | |
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| 31 | rc = platform_device_add(pdev); |
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| 32 | if (rc) |
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| 33 | platform_device_put(pdev); |
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| 34 | |
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| 35 | return rc; |
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| 36 | } |
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| 37 | device_initcall(register_e820_pmem); |
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| 38 | |
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