tz_context.h

/******************************************************************************
 * @file     tz_context.h
 * @brief    Context Management for Armv8-M TrustZone
 * @version  V1.0.1
 * @date     10. January 2018
 ******************************************************************************/
/*
 * Copyright (c) 2017-2018 Arm Limited. All rights reserved.
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Licensed under the Apache License, Version 2.0 (the License); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#if   defined ( __ICCARM__ )
  #pragma system_include         /* treat file as system include file for MISRA check */
#elif defined (__clang__)
  #pragma clang system_header   /* treat file as system include file */
#endif

#ifndef TZ_CONTEXT_H
#define TZ_CONTEXT_H
 
#include <stdint.h>
 
#ifndef TZ_MODULEID_T
#define TZ_MODULEID_T
/// \details Data type that identifies secure software modules called by a process.
typedef uint32_t TZ_ModuleId_t;
#endif
 
/// \details TZ Memory ID identifies an allocated memory slot.
typedef uint32_t TZ_MemoryId_t;
  
/// Initialize secure context memory system
/// \return execution status (1: success, 0: error)
uint32_t TZ_InitContextSystem_S (void);
 
/// Allocate context memory for calling secure software modules in TrustZone
/// \param[in]  module   identifies software modules called from non-secure mode
/// \return value != 0 id TrustZone memory slot identifier
/// \return value 0    no memory available or internal error
TZ_MemoryId_t TZ_AllocModuleContext_S (TZ_ModuleId_t module);
 
/// Free context memory that was previously allocated with \ref TZ_AllocModuleContext_S
/// \param[in]  id  TrustZone memory slot identifier
/// \return execution status (1: success, 0: error)
uint32_t TZ_FreeModuleContext_S (TZ_MemoryId_t id);
 
/// Load secure context (called on RTOS thread context switch)
/// \param[in]  id  TrustZone memory slot identifier
/// \return execution status (1: success, 0: error)
uint32_t TZ_LoadContext_S (TZ_MemoryId_t id);
 
/// Store secure context (called on RTOS thread context switch)
/// \param[in]  id  TrustZone memory slot identifier
/// \return execution status (1: success, 0: error)
uint32_t TZ_StoreContext_S (TZ_MemoryId_t id);
 
#endif  // TZ_CONTEXT_H