ArmPlatformPkg/TZASC: Allow specifying subregions to be disabled

[mirror_edk2.git] / ArmPlatformPkg / Drivers / ArmTrustZone / ArmTrustZone.c

/** @file\r
*\r
*  Copyright (c) 2011-2012, ARM Limited. All rights reserved.\r
*\r
*  This program and the accompanying materials\r
*  are licensed and made available under the terms and conditions of the BSD License\r
*  which accompanies this distribution.  The full text of the license may be found at\r
*  http://opensource.org/licenses/bsd-license.php\r
*\r
*  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
*  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
*\r
**/\r
\r
#include <Library/BaseLib.h>\r
#include <Library/IoLib.h>\r
\r
#include <Drivers/ArmTrustzone.h>\r
\r
#define TZPC_DECPROT0_STATUS_REG        0x800\r
#define TZPC_DECPROT0_SET_REG           0x804\r
#define TZPC_DECPROT0_CLEAR_REG         0x808\r
\r
#define TZASC_CONFIGURATION_REG         0x000\r
#define TZASC_REGIONS_REG               0x100\r
#define TZASC_REGION0_LOW_ADDRESS_REG   0x100\r
#define TZASC_REGION0_HIGH_ADDRESS_REG  0x104\r
#define TZASC_REGION0_ATTRIBUTES        0x108\r
\r
/**\r
    FIXME: Need documentation\r
**/\r
EFI_STATUS\r
TZPCSetDecProtBits (\r
  IN  UINTN TzpcBase,\r
  IN  UINTN TzpcId,\r
  IN  UINTN Bits\r
  )\r
{\r
  if (TzpcId > TZPC_DECPROT_MAX) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  MmioWrite32 ((UINTN)TzpcBase + TZPC_DECPROT0_SET_REG + (TzpcId * 0x0C), Bits);\r
\r
  return EFI_SUCCESS;\r
}\r
\r
/**\r
    FIXME: Need documentation\r
**/\r
EFI_STATUS\r
TZPCClearDecProtBits (\r
  IN  UINTN TzpcBase,\r
  IN  UINTN TzpcId,\r
  IN  UINTN Bits\r
  )\r
{\r
  if (TzpcId> TZPC_DECPROT_MAX) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  MmioWrite32 ((UINTN)TzpcBase + TZPC_DECPROT0_CLEAR_REG + (TzpcId * 0x0C), Bits);\r
\r
  return EFI_SUCCESS;\r
}\r
\r
/**\r
    FIXME: Need documentation\r
**/\r
UINT32\r
TZASCGetNumRegions (\r
  IN UINTN TzascBase\r
  )\r
{\r
  return (MmioRead32 ((UINTN)TzascBase + TZASC_CONFIGURATION_REG) & 0xF);\r
}\r
\r
/**\r
    FIXME: Need documentation\r
**/\r
EFI_STATUS\r
TZASCSetRegion (\r
  IN  INTN  TzascBase,\r
  IN  UINTN RegionId,\r
  IN  UINTN Enabled,\r
  IN  UINTN LowAddress,\r
  IN  UINTN HighAddress,\r
  IN  UINTN Size,\r
  IN  UINTN Security,\r
  IN  UINTN SubregionDisableMask\r
  )\r
{\r
  UINT32*     Region;\r
  UINT32      RegionAttributes;\r
\r
  if (RegionId > TZASCGetNumRegions(TzascBase)) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  RegionAttributes = TZASC_REGION_ATTR_SECURITY(Security) |\r
                     TZASC_REGION_ATTR_SUBREG_DISABLE(SubregionDisableMask) |\r
                     TZASC_REGION_ATTR_SIZE(Size) |\r
                     TZASC_REGION_ATTR_ENABLE(Enabled);\r
\r
  Region = (UINT32*)((UINTN)TzascBase + TZASC_REGIONS_REG + (RegionId * 0x10));\r
\r
  MmioWrite32((UINTN)(Region), TZASC_REGION_SETUP_LO_ADDR(LowAddress));\r
  MmioWrite32((UINTN)(Region+1), HighAddress);\r
  MmioWrite32((UINTN)(Region+2), RegionAttributes);\r
\r
  return EFI_SUCCESS;\r
}\r