MdeModulePkg/Universal/CapsuleRuntimeDxe/CapsuleCache.c

   1 /** @file
   2   Flush the cache is required for most architectures while do capsule
   3   update. It is not support at Runtime.
   4
   5   Copyright (c) 2018, Linaro, Ltd. All rights reserved.<BR>
   6   Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
   7
   8   SPDX-License-Identifier: BSD-2-Clause-Patent
   9
  10 **/
  11
  12 #include "CapsuleService.h"
  13
  14 #include <Library/CacheMaintenanceLib.h>
  15
  16 /**
  17   Writes Back a range of data cache lines covering a set of capsules in memory.
  18
  19   Writes Back the data cache lines specified by ScatterGatherList.
  20
  21   @param  ScatterGatherList Physical address of the data structure that
  22                             describes a set of capsules in memory
  23
  24 **/
  25 VOID
  26 CapsuleCacheWriteBack (
  27   IN  EFI_PHYSICAL_ADDRESS  ScatterGatherList
  28   )
  29 {
  30   EFI_CAPSULE_BLOCK_DESCRIPTOR  *Desc;
  31
  32   if (!EfiAtRuntime ()) {
  33     Desc = (EFI_CAPSULE_BLOCK_DESCRIPTOR *)(UINTN)ScatterGatherList;
  34     do {
  35       WriteBackDataCacheRange (
  36         (VOID *)(UINTN)Desc,
  37         (UINTN)sizeof (*Desc)
  38         );
  39
  40       if (Desc->Length > 0) {
  41         WriteBackDataCacheRange (
  42           (VOID *)(UINTN)Desc->Union.DataBlock,
  43           (UINTN)Desc->Length
  44           );
  45         Desc++;
  46       } else if (Desc->Union.ContinuationPointer > 0) {
  47         Desc = (EFI_CAPSULE_BLOCK_DESCRIPTOR *)(UINTN)Desc->Union.ContinuationPointer;
  48       }
  49     } while (Desc->Length > 0 || Desc->Union.ContinuationPointer > 0);
  50
  51     WriteBackDataCacheRange (
  52       (VOID *)(UINTN)Desc,
  53       (UINTN)sizeof (*Desc)
  54       );
  55   }
  56 }