From 03dd4cb26d967f9588437b0fc9cc0e8353322bb7 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Fri, 25 Mar 2016 03:53:42 -0300 Subject: Linux-libre 4.5-gnu --- arch/arm/kernel/efi.c | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 arch/arm/kernel/efi.c (limited to 'arch/arm/kernel/efi.c') diff --git a/arch/arm/kernel/efi.c b/arch/arm/kernel/efi.c new file mode 100644 index 000000000..ff8a9d8ac --- /dev/null +++ b/arch/arm/kernel/efi.c @@ -0,0 +1,38 @@ +/* + * Copyright (C) 2015 Linaro Ltd + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include +#include + +int __init efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md) +{ + struct map_desc desc = { + .virtual = md->virt_addr, + .pfn = __phys_to_pfn(md->phys_addr), + .length = md->num_pages * EFI_PAGE_SIZE, + }; + + /* + * Order is important here: memory regions may have all of the + * bits below set (and usually do), so we check them in order of + * preference. + */ + if (md->attribute & EFI_MEMORY_WB) + desc.type = MT_MEMORY_RWX; + else if (md->attribute & EFI_MEMORY_WT) + desc.type = MT_MEMORY_RWX_NONCACHED; + else if (md->attribute & EFI_MEMORY_WC) + desc.type = MT_DEVICE_WC; + else + desc.type = MT_DEVICE; + + create_mapping_late(mm, &desc, true); + return 0; +} -- cgit v1.2.3-54-g00ecf