ArmPkg/Library/ArmLib/ArmLib.c

   1 /** @file
   2
   3   Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
   4   Copyright (c) 2011 - 2021, ARM Ltd. All rights reserved.<BR>
   5
   6   SPDX-License-Identifier: BSD-2-Clause-Patent
   7
   8 **/
   9
  10 #include <Base.h>
  11
  12 #include <Library/ArmLib.h>
  13
  14 #include "ArmLibPrivate.h"
  15
  16 VOID
  17 EFIAPI
  18 ArmSetAuxCrBit (
  19   IN  UINT32  Bits
  20   )
  21 {
  22   ArmWriteAuxCr (ArmReadAuxCr () | Bits);
  23 }
  24
  25 VOID
  26 EFIAPI
  27 ArmUnsetAuxCrBit (
  28   IN  UINT32  Bits
  29   )
  30 {
  31   ArmWriteAuxCr (ArmReadAuxCr () & ~Bits);
  32 }
  33
  34 //
  35 // Helper functions for accessing CPUACTLR
  36 //
  37
  38 VOID
  39 EFIAPI
  40 ArmSetCpuActlrBit (
  41   IN  UINTN  Bits
  42   )
  43 {
  44   ArmWriteCpuActlr (ArmReadCpuActlr () | Bits);
  45 }
  46
  47 VOID
  48 EFIAPI
  49 ArmUnsetCpuActlrBit (
  50   IN  UINTN  Bits
  51   )
  52 {
  53   ArmWriteCpuActlr (ArmReadCpuActlr () & ~Bits);
  54 }
  55
  56 UINTN
  57 EFIAPI
  58 ArmDataCacheLineLength (
  59   VOID
  60   )
  61 {
  62   return 4 << ((ArmCacheInfo () >> 16) & 0xf); // CTR_EL0.DminLine
  63 }
  64
  65 UINTN
  66 EFIAPI
  67 ArmInstructionCacheLineLength (
  68   VOID
  69   )
  70 {
  71   return 4 << (ArmCacheInfo () & 0xf); // CTR_EL0.IminLine
  72 }
  73
  74 UINTN
  75 EFIAPI
  76 ArmCacheWritebackGranule (
  77   VOID
  78   )
  79 {
  80   UINTN  CWG;
  81
  82   CWG = (ArmCacheInfo () >> 24) & 0xf; // CTR_EL0.CWG
  83
  84   if (CWG == 0) {
  85     return SIZE_2KB;
  86   }
  87
  88   return 4 << CWG;
  89 }