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
  33 TZPCSetDecProtBits (
  34   IN  UINTN TzpcBase,
  35   IN  UINTN TzpcId,
  36   IN  UINTN Bits
  37   )
  38 {
  39   if (TzpcId > TZPC_DECPROT_MAX) {
  40     return EFI_INVALID_PARAMETER;
  41   }
  42
  43   MmioWrite32 ((UINTN)TzpcBase + TZPC_DECPROT0_SET_REG + (TzpcId * 0x0C), Bits);
  44
  45   return EFI_SUCCESS;
  46 }
  47
  48 /**
  49     FIXME: Need documentation
  50 **/
  51 EFI_STATUS
  52 TZPCClearDecProtBits (
  53   IN  UINTN TzpcBase,
  54   IN  UINTN TzpcId,
  55   IN  UINTN Bits
  56   )
  57 {
  58   if (TzpcId> TZPC_DECPROT_MAX) {
  59     return EFI_INVALID_PARAMETER;
  60   }
  61
  62   MmioWrite32 ((UINTN)TzpcBase + TZPC_DECPROT0_CLEAR_REG + (TzpcId * 0x0C), Bits);
  63
  64   return EFI_SUCCESS;
  65 }
  66
  67 /**
  68     FIXME: Need documentation
  69 **/
  70 UINT32
  71 TZASCGetNumRegions (
  72   IN UINTN TzascBase
  73   )
  74 {
  75   return (MmioRead32 ((UINTN)TzascBase + TZASC_CONFIGURATION_REG) & 0xF);
  76 }
  77
  78 /**
  79     FIXME: Need documentation
  80 **/
  81 EFI_STATUS
  82 TZASCSetRegion (
  83   IN  INTN  TzascBase,
  84   IN  UINTN RegionId,
  85   IN  UINTN Enabled,
  86   IN  UINTN LowAddress,
  87   IN  UINTN HighAddress,
  88   IN  UINTN Size,
  89   IN  UINTN Security
  90   )
  91 {
  92   UINT32*     Region;
  93
  94   if (RegionId > TZASCGetNumRegions(TzascBase)) {
  95     return EFI_INVALID_PARAMETER;
  96   }
  97
  98   Region = (UINT32*)((UINTN)TzascBase + TZASC_REGIONS_REG + (RegionId * 0x10));
  99
 100   MmioWrite32((UINTN)(Region), LowAddress&0xFFFF8000);
 101   MmioWrite32((UINTN)(Region+1), HighAddress);
 102   MmioWrite32((UINTN)(Region+2), ((Security & 0xF) <<28) | ((Size & 0x3F) << 1) | (Enabled & 0x1));
 103
 104   return EFI_SUCCESS;
 105 }