ArmPkg/Library/ArmTrustZoneLib/ArmTrustZone.c

   1 /** @file
   2 *
   3 *  Copyright (c) 2011, 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 #include <Library/ArmTrustZoneLib.h>
  18
  19 #define TZPC_DECPROT0_STATUS_REG        0x800
  20 #define TZPC_DECPROT0_SET_REG           0x804
  21 #define TZPC_DECPROT0_CLEAR_REG         0x808
  22
  23 #define TZASC_CONFIGURATION_REG         0x000
  24 #define TZASC_REGIONS_REG               0x100
  25 #define TZASC_REGION0_LOW_ADDRESS_REG   0x100
  26 #define TZASC_REGION0_HIGH_ADDRESS_REG  0x104
  27 #define TZASC_REGION0_ATTRIBUTES        0x108
  28
  29 /**
  30     FIXME: Need documentation
  31 **/
  32 EFI_STATUS TZPCSetDecProtBits(UINTN TzpcBase, UINTN TzpcId, UINTN Bits) {
  33     if (TzpcId > TZPC_DECPROT_MAX) {
  34         return EFI_INVALID_PARAMETER;
  35     }
  36
  37     MmioWrite32((UINTN)TzpcBase + TZPC_DECPROT0_SET_REG + (TzpcId * 0x0C), Bits);
  38
  39     return EFI_SUCCESS;
  40 }
  41
  42 /**
  43     FIXME: Need documentation
  44 **/
  45 EFI_STATUS TZPCClearDecProtBits(UINTN TzpcBase, UINTN TzpcId, UINTN Bits) {
  46     if (TzpcId> TZPC_DECPROT_MAX) {
  47         return EFI_INVALID_PARAMETER;
  48     }
  49
  50     MmioWrite32((UINTN)TzpcBase + TZPC_DECPROT0_CLEAR_REG + (TzpcId * 0x0C), Bits);
  51
  52     return EFI_SUCCESS;
  53 }
  54
  55 /**
  56     FIXME: Need documentation
  57 **/
  58 UINT32 TZASCGetNumRegions(UINTN TzascBase) {
  59     return (MmioRead32((UINTN)TzascBase + TZASC_CONFIGURATION_REG) & 0xF);
  60 }
  61
  62 /**
  63     FIXME: Need documentation
  64 **/
  65 EFI_STATUS TZASCSetRegion(UINTN TzascBase, UINTN RegionId, UINTN Enabled, UINTN LowAddress, UINTN HighAddress, UINTN Size, UINTN Security) {
  66     UINT32*     Region;
  67
  68     if (RegionId > TZASCGetNumRegions(TzascBase)) {
  69         return EFI_INVALID_PARAMETER;
  70     }
  71
  72     Region = (UINT32*)((UINTN)TzascBase + TZASC_REGIONS_REG + (RegionId * 0x10));
  73
  74     MmioWrite32((UINTN)(Region), LowAddress&0xFFFF8000);
  75 \s\sMmioWrite32((UINTN)(Region+1), HighAddress);
  76 \s\sMmioWrite32((UINTN)(Region+2), ((Security & 0xF) <<28) | ((Size & 0x3F) << 1) | (Enabled & 0x1));
  77
  78     return EFI_SUCCESS;
  79 }