ArmPlatformPkg/Drivers/ArmTrustZone/ArmTrustZone.c

   1 /** @file
   2 *
   3 *  Copyright (c) 2011-2012, ARM Limited. All rights reserved.
   4 *
   5 *  This program and the accompanying materials
   6 *  are licensed and made available under the terms and conditions of the BSD License
   7 *  which accompanies this distribution.  The full text of the license may be found at
   8 *  http://opensource.org/licenses/bsd-license.php
   9 *
  10 *  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 *  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12 *
  13 **/
  14
  15 #include <Library/BaseLib.h>
  16 #include <Library/IoLib.h>
  17
  18 #include <Drivers/ArmTrustzone.h>
  19
  20 #define TZPC_DECPROT0_STATUS_REG        0x800
  21 #define TZPC_DECPROT0_SET_REG           0x804
  22 #define TZPC_DECPROT0_CLEAR_REG         0x808
  23
  24 #define TZASC_CONFIGURATION_REG         0x000
  25 #define TZASC_REGIONS_REG               0x100
  26 #define TZASC_REGION0_LOW_ADDRESS_REG   0x100
  27 #define TZASC_REGION0_HIGH_ADDRESS_REG  0x104
  28 #define TZASC_REGION0_ATTRIBUTES        0x108
  29
  30 /**
  31     FIXME: Need documentation
  32 **/
  33 EFI_STATUS
  34 TZPCSetDecProtBits (
  35   IN  UINTN TzpcBase,
  36   IN  UINTN TzpcId,
  37   IN  UINTN Bits
  38   )
  39 {
  40   if (TzpcId > TZPC_DECPROT_MAX) {
  41     return EFI_INVALID_PARAMETER;
  42   }
  43
  44   MmioWrite32 ((UINTN)TzpcBase + TZPC_DECPROT0_SET_REG + (TzpcId * 0x0C), Bits);
  45
  46   return EFI_SUCCESS;
  47 }
  48
  49 /**
  50     FIXME: Need documentation
  51 **/
  52 EFI_STATUS
  53 TZPCClearDecProtBits (
  54   IN  UINTN TzpcBase,
  55   IN  UINTN TzpcId,
  56   IN  UINTN Bits
  57   )
  58 {
  59   if (TzpcId> TZPC_DECPROT_MAX) {
  60     return EFI_INVALID_PARAMETER;
  61   }
  62
  63   MmioWrite32 ((UINTN)TzpcBase + TZPC_DECPROT0_CLEAR_REG + (TzpcId * 0x0C), Bits);
  64
  65   return EFI_SUCCESS;
  66 }
  67
  68 /**
  69     FIXME: Need documentation
  70 **/
  71 UINT32
  72 TZASCGetNumRegions (
  73   IN UINTN TzascBase
  74   )
  75 {
  76   return (MmioRead32 ((UINTN)TzascBase + TZASC_CONFIGURATION_REG) & 0xF);
  77 }
  78
  79 /**
  80     FIXME: Need documentation
  81 **/
  82 EFI_STATUS
  83 TZASCSetRegion (
  84   IN  INTN  TzascBase,
  85   IN  UINTN RegionId,
  86   IN  UINTN Enabled,
  87   IN  UINTN LowAddress,
  88   IN  UINTN HighAddress,
  89   IN  UINTN Size,
  90   IN  UINTN Security,
  91   IN  UINTN SubregionDisableMask
  92   )
  93 {
  94   UINT32*     Region;
  95   UINT32      RegionAttributes;
  96
  97   if (RegionId > TZASCGetNumRegions(TzascBase)) {
  98     return EFI_INVALID_PARAMETER;
  99   }
 100
 101   RegionAttributes = TZASC_REGION_ATTR_SECURITY(Security) |
 102                      TZASC_REGION_ATTR_SUBREG_DISABLE(SubregionDisableMask) |
 103                      TZASC_REGION_ATTR_SIZE(Size) |
 104                      TZASC_REGION_ATTR_ENABLE(Enabled);
 105
 106   Region = (UINT32*)((UINTN)TzascBase + TZASC_REGIONS_REG + (RegionId * 0x10));
 107
 108   MmioWrite32((UINTN)(Region), TZASC_REGION_SETUP_LO_ADDR(LowAddress));
 109   MmioWrite32((UINTN)(Region+1), HighAddress);
 110   MmioWrite32((UINTN)(Region+2), RegionAttributes);
 111
 112   return EFI_SUCCESS;
 113 }