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   )
  92 {
  93   UINT32*     Region;
  94
  95   if (RegionId > TZASCGetNumRegions(TzascBase)) {
  96     return EFI_INVALID_PARAMETER;
  97   }
  98
  99   Region = (UINT32*)((UINTN)TzascBase + TZASC_REGIONS_REG + (RegionId * 0x10));
 100
 101   MmioWrite32((UINTN)(Region), LowAddress&0xFFFF8000);
 102   MmioWrite32((UINTN)(Region+1), HighAddress);
 103   MmioWrite32((UINTN)(Region+2), ((Security & 0xF) <<28) | ((Size & 0x3F) << 1) | (Enabled & 0x1));
 104
 105   return EFI_SUCCESS;
 106 }