arch/arm/kernel/efi.c

   1 /*
   2  * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 #include <linux/efi.h>
  10 #include <asm/efi.h>
  11 #include <asm/mach/map.h>
  12 #include <asm/mmu_context.h>
  13
  14 int __init efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md)
  15 {
  16         struct map_desc desc = {
  17                 .virtual        = md->virt_addr,
  18                 .pfn            = __phys_to_pfn(md->phys_addr),
  19                 .length         = md->num_pages * EFI_PAGE_SIZE,
  20         };
  21
  22         /*
  23          * Order is important here: memory regions may have all of the
  24          * bits below set (and usually do), so we check them in order of
  25          * preference.
  26          */
  27         if (md->attribute & EFI_MEMORY_WB)
  28                 desc.type = MT_MEMORY_RWX;
  29         else if (md->attribute & EFI_MEMORY_WT)
  30                 desc.type = MT_MEMORY_RWX_NONCACHED;
  31         else if (md->attribute & EFI_MEMORY_WC)
  32                 desc.type = MT_DEVICE_WC;
  33         else
  34                 desc.type = MT_DEVICE;
  35
  36         create_mapping_late(mm, &desc, true);
  37         return 0;
  38 }