You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
139 lines
4.9 KiB
C
139 lines
4.9 KiB
C
/*
|
|
* FreeRTOS Kernel <DEVELOPMENT BRANCH>
|
|
* Copyright (C) 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
|
|
*
|
|
* SPDX-License-Identifier: MIT
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy of
|
|
* this software and associated documentation files (the "Software"), to deal in
|
|
* the Software without restriction, including without limitation the rights to
|
|
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
|
|
* the Software, and to permit persons to whom the Software is furnished to do so,
|
|
* subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in all
|
|
* copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
|
|
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
|
|
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
|
|
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
|
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
*
|
|
* https://www.FreeRTOS.org
|
|
* https://github.com/FreeRTOS
|
|
*
|
|
*/
|
|
|
|
#ifndef __SECURE_CONTEXT_H__
|
|
#define __SECURE_CONTEXT_H__
|
|
|
|
/* Standard includes. */
|
|
#include <stdint.h>
|
|
|
|
/* FreeRTOS includes. */
|
|
#include "FreeRTOSConfig.h"
|
|
|
|
/**
|
|
* @brief PSP value when no secure context is loaded.
|
|
*/
|
|
#define securecontextNO_STACK 0x0
|
|
|
|
/**
|
|
* @brief Invalid context ID.
|
|
*/
|
|
#define securecontextINVALID_CONTEXT_ID 0UL
|
|
/*-----------------------------------------------------------*/
|
|
|
|
/**
|
|
* @brief Structure to represent a secure context.
|
|
*
|
|
* @note Since stack grows down, pucStackStart is the highest address while
|
|
* pucStackLimit is the first address of the allocated memory.
|
|
*/
|
|
typedef struct SecureContext
|
|
{
|
|
uint8_t * pucCurrentStackPointer; /**< Current value of stack pointer (PSP). */
|
|
uint8_t * pucStackLimit; /**< Last location of the stack memory (PSPLIM). */
|
|
uint8_t * pucStackStart; /**< First location of the stack memory. */
|
|
void * pvTaskHandle; /**< Task handle of the task this context is associated with. */
|
|
} SecureContext_t;
|
|
/*-----------------------------------------------------------*/
|
|
|
|
/**
|
|
* @brief Opaque handle for a secure context.
|
|
*/
|
|
typedef uint32_t SecureContextHandle_t;
|
|
/*-----------------------------------------------------------*/
|
|
|
|
/**
|
|
* @brief Initializes the secure context management system.
|
|
*
|
|
* PSP is set to NULL and therefore a task must allocate and load a context
|
|
* before calling any secure side function in the thread mode.
|
|
*
|
|
* @note This function must be called in the handler mode. It is no-op if called
|
|
* in the thread mode.
|
|
*/
|
|
void SecureContext_Init( void );
|
|
|
|
/**
|
|
* @brief Allocates a context on the secure side.
|
|
*
|
|
* @note This function must be called in the handler mode. It is no-op if called
|
|
* in the thread mode.
|
|
*
|
|
* @param[in] ulSecureStackSize Size of the stack to allocate on secure side.
|
|
* @param[in] ulIsTaskPrivileged 1 if the calling task is privileged, 0 otherwise.
|
|
*
|
|
* @return Opaque context handle if context is successfully allocated, NULL
|
|
* otherwise.
|
|
*/
|
|
#if ( configENABLE_MPU == 1 )
|
|
SecureContextHandle_t SecureContext_AllocateContext( uint32_t ulSecureStackSize,
|
|
uint32_t ulIsTaskPrivileged,
|
|
void * pvTaskHandle );
|
|
#else /* configENABLE_MPU */
|
|
SecureContextHandle_t SecureContext_AllocateContext( uint32_t ulSecureStackSize,
|
|
void * pvTaskHandle );
|
|
#endif /* configENABLE_MPU */
|
|
|
|
/**
|
|
* @brief Frees the given context.
|
|
*
|
|
* @note This function must be called in the handler mode. It is no-op if called
|
|
* in the thread mode.
|
|
*
|
|
* @param[in] xSecureContextHandle Context handle corresponding to the
|
|
* context to be freed.
|
|
*/
|
|
void SecureContext_FreeContext( SecureContextHandle_t xSecureContextHandle,
|
|
void * pvTaskHandle );
|
|
|
|
/**
|
|
* @brief Loads the given context.
|
|
*
|
|
* @note This function must be called in the handler mode. It is no-op if called
|
|
* in the thread mode.
|
|
*
|
|
* @param[in] xSecureContextHandle Context handle corresponding to the context
|
|
* to be loaded.
|
|
*/
|
|
void SecureContext_LoadContext( SecureContextHandle_t xSecureContextHandle,
|
|
void * pvTaskHandle );
|
|
|
|
/**
|
|
* @brief Saves the given context.
|
|
*
|
|
* @note This function must be called in the handler mode. It is no-op if called
|
|
* in the thread mode.
|
|
*
|
|
* @param[in] xSecureContextHandle Context handle corresponding to the context
|
|
* to be saved.
|
|
*/
|
|
void SecureContext_SaveContext( SecureContextHandle_t xSecureContextHandle,
|
|
void * pvTaskHandle );
|
|
|
|
#endif /* __SECURE_CONTEXT_H__ */
|