* Bit[0] - 0 --> Thread mode is privileged.\r
* Bit[1] - 1 --> Thread mode uses PSP.\r
*/\r
-#define securecontextCONTROL_VALUE_PRIVILEGED 0x02\r
+#define securecontextCONTROL_VALUE_PRIVILEGED 0x02\r
\r
/**\r
* @brief CONTROL value for un-privileged tasks.\r
* Bit[0] - 1 --> Thread mode is un-privileged.\r
* Bit[1] - 1 --> Thread mode uses PSP.\r
*/\r
-#define securecontextCONTROL_VALUE_UNPRIVILEGED 0x03\r
+#define securecontextCONTROL_VALUE_UNPRIVILEGED 0x03\r
/*-----------------------------------------------------------*/\r
\r
/**\r
*/\r
typedef struct SecureContext\r
{\r
- uint8_t *pucCurrentStackPointer; /**< Current value of stack pointer (PSP). */\r
- uint8_t *pucStackLimit; /**< Last location of the stack memory (PSPLIM). */\r
- uint8_t *pucStackStart; /**< First location of the stack memory. */\r
+ uint8_t *pucCurrentStackPointer; /**< Current value of stack pointer (PSP). */\r
+ uint8_t *pucStackLimit; /**< Last location of the stack memory (PSPLIM). */\r
+ uint8_t *pucStackStart; /**< First location of the stack memory. */\r
} SecureContext_t;\r
/*-----------------------------------------------------------*/\r
\r
secureportNON_SECURE_CALLABLE void SecureContext_Init( void )\r
{\r
- uint32_t ulIPSR;\r
-\r
- /* Read the Interrupt Program Status Register (IPSR) value. */\r
- secureportREAD_IPSR( ulIPSR );\r
-\r
- /* Do nothing if the processor is running in the Thread Mode. IPSR is zero\r
- * when the processor is running in the Thread Mode. */\r
- if( ulIPSR != 0 )\r
- {\r
- /* No stack for thread mode until a task's context is loaded. */\r
- secureportSET_PSPLIM( securecontextNO_STACK );\r
- secureportSET_PSP( securecontextNO_STACK );\r
-\r
- #if( configENABLE_MPU == 1 )\r
- {\r
- /* Configure thread mode to use PSP and to be unprivileged. */\r
- secureportSET_CONTROL( securecontextCONTROL_VALUE_UNPRIVILEGED );\r
- }\r
- #else /* configENABLE_MPU */\r
- {\r
- /* Configure thread mode to use PSP and to be privileged.. */\r
- secureportSET_CONTROL( securecontextCONTROL_VALUE_PRIVILEGED );\r
- }\r
- #endif /* configENABLE_MPU */\r
- }\r
+ uint32_t ulIPSR;\r
+\r
+ /* Read the Interrupt Program Status Register (IPSR) value. */\r
+ secureportREAD_IPSR( ulIPSR );\r
+\r
+ /* Do nothing if the processor is running in the Thread Mode. IPSR is zero\r
+ * when the processor is running in the Thread Mode. */\r
+ if( ulIPSR != 0 )\r
+ {\r
+ /* No stack for thread mode until a task's context is loaded. */\r
+ secureportSET_PSPLIM( securecontextNO_STACK );\r
+ secureportSET_PSP( securecontextNO_STACK );\r
+\r
+ #if( configENABLE_MPU == 1 )\r
+ {\r
+ /* Configure thread mode to use PSP and to be unprivileged. */\r
+ secureportSET_CONTROL( securecontextCONTROL_VALUE_UNPRIVILEGED );\r
+ }\r
+ #else /* configENABLE_MPU */\r
+ {\r
+ /* Configure thread mode to use PSP and to be privileged.. */\r
+ secureportSET_CONTROL( securecontextCONTROL_VALUE_PRIVILEGED );\r
+ }\r
+ #endif /* configENABLE_MPU */\r
+ }\r
}\r
/*-----------------------------------------------------------*/\r
\r
#if( configENABLE_MPU == 1 )\r
- secureportNON_SECURE_CALLABLE SecureContextHandle_t SecureContext_AllocateContext( uint32_t ulSecureStackSize, uint32_t ulIsTaskPrivileged )\r
+ secureportNON_SECURE_CALLABLE SecureContextHandle_t SecureContext_AllocateContext( uint32_t ulSecureStackSize, uint32_t ulIsTaskPrivileged )\r
#else /* configENABLE_MPU */\r
- secureportNON_SECURE_CALLABLE SecureContextHandle_t SecureContext_AllocateContext( uint32_t ulSecureStackSize )\r
+ secureportNON_SECURE_CALLABLE SecureContextHandle_t SecureContext_AllocateContext( uint32_t ulSecureStackSize )\r
#endif /* configENABLE_MPU */\r
{\r
- uint8_t *pucStackMemory = NULL;\r
- uint32_t ulIPSR;\r
- SecureContextHandle_t xSecureContextHandle = NULL;\r
- #if( configENABLE_MPU == 1 )\r
- uint32_t *pulCurrentStackPointer = NULL;\r
- #endif /* configENABLE_MPU */\r
-\r
- /* Read the Interrupt Program Status Register (IPSR) value. */\r
- secureportREAD_IPSR( ulIPSR );\r
-\r
- /* Do nothing if the processor is running in the Thread Mode. IPSR is zero\r
- * when the processor is running in the Thread Mode. */\r
- if( ulIPSR != 0 )\r
- {\r
- /* Allocate the context structure. */\r
- xSecureContextHandle = ( SecureContextHandle_t ) pvPortMalloc( sizeof( SecureContext_t ) );\r
-\r
- if( xSecureContextHandle != NULL )\r
- {\r
- /* Allocate the stack space. */\r
- pucStackMemory = pvPortMalloc( ulSecureStackSize );\r
-\r
- if( pucStackMemory != NULL )\r
- {\r
- /* Since stack grows down, the starting point will be the last\r
- * location. Note that this location is next to the last\r
- * allocated byte because the hardware decrements the stack\r
- * pointer before writing i.e. if stack pointer is 0x2, a push\r
- * operation will decrement the stack pointer to 0x1 and then\r
- * write at 0x1. */\r
- xSecureContextHandle->pucStackStart = pucStackMemory + ulSecureStackSize;\r
-\r
- /* The stack cannot go beyond this location. This value is\r
- * programmed in the PSPLIM register on context switch.*/\r
- xSecureContextHandle->pucStackLimit = pucStackMemory;\r
-\r
- #if( configENABLE_MPU == 1 )\r
- {\r
- /* Store the correct CONTROL value for the task on the stack.\r
- * This value is programmed in the CONTROL register on\r
- * context switch. */\r
- pulCurrentStackPointer = ( uint32_t * ) xSecureContextHandle->pucStackStart;\r
- pulCurrentStackPointer--;\r
- if( ulIsTaskPrivileged )\r
- {\r
- *( pulCurrentStackPointer ) = securecontextCONTROL_VALUE_PRIVILEGED;\r
- }\r
- else\r
- {\r
- *( pulCurrentStackPointer ) = securecontextCONTROL_VALUE_UNPRIVILEGED;\r
- }\r
-\r
- /* Store the current stack pointer. This value is programmed in\r
- * the PSP register on context switch. */\r
- xSecureContextHandle->pucCurrentStackPointer = ( uint8_t * ) pulCurrentStackPointer;\r
- }\r
- #else /* configENABLE_MPU */\r
- {\r
- /* Current SP is set to the starting of the stack. This\r
- * value programmed in the PSP register on context switch. */\r
- xSecureContextHandle->pucCurrentStackPointer = xSecureContextHandle->pucStackStart;\r
-\r
- }\r
- #endif /* configENABLE_MPU */\r
- }\r
- else\r
- {\r
- /* Free the context to avoid memory leak and make sure to return\r
- * NULL to indicate failure. */\r
- vPortFree( xSecureContextHandle );\r
- xSecureContextHandle = NULL;\r
- }\r
- }\r
- }\r
-\r
- return xSecureContextHandle;\r
+ uint8_t *pucStackMemory = NULL;\r
+ uint32_t ulIPSR;\r
+ SecureContextHandle_t xSecureContextHandle = NULL;\r
+ #if( configENABLE_MPU == 1 )\r
+ uint32_t *pulCurrentStackPointer = NULL;\r
+ #endif /* configENABLE_MPU */\r
+\r
+ /* Read the Interrupt Program Status Register (IPSR) value. */\r
+ secureportREAD_IPSR( ulIPSR );\r
+\r
+ /* Do nothing if the processor is running in the Thread Mode. IPSR is zero\r
+ * when the processor is running in the Thread Mode. */\r
+ if( ulIPSR != 0 )\r
+ {\r
+ /* Allocate the context structure. */\r
+ xSecureContextHandle = ( SecureContextHandle_t ) pvPortMalloc( sizeof( SecureContext_t ) );\r
+\r
+ if( xSecureContextHandle != NULL )\r
+ {\r
+ /* Allocate the stack space. */\r
+ pucStackMemory = pvPortMalloc( ulSecureStackSize );\r
+\r
+ if( pucStackMemory != NULL )\r
+ {\r
+ /* Since stack grows down, the starting point will be the last\r
+ * location. Note that this location is next to the last\r
+ * allocated byte because the hardware decrements the stack\r
+ * pointer before writing i.e. if stack pointer is 0x2, a push\r
+ * operation will decrement the stack pointer to 0x1 and then\r
+ * write at 0x1. */\r
+ xSecureContextHandle->pucStackStart = pucStackMemory + ulSecureStackSize;\r
+\r
+ /* The stack cannot go beyond this location. This value is\r
+ * programmed in the PSPLIM register on context switch.*/\r
+ xSecureContextHandle->pucStackLimit = pucStackMemory;\r
+\r
+ #if( configENABLE_MPU == 1 )\r
+ {\r
+ /* Store the correct CONTROL value for the task on the stack.\r
+ * This value is programmed in the CONTROL register on\r
+ * context switch. */\r
+ pulCurrentStackPointer = ( uint32_t * ) xSecureContextHandle->pucStackStart;\r
+ pulCurrentStackPointer--;\r
+ if( ulIsTaskPrivileged )\r
+ {\r
+ *( pulCurrentStackPointer ) = securecontextCONTROL_VALUE_PRIVILEGED;\r
+ }\r
+ else\r
+ {\r
+ *( pulCurrentStackPointer ) = securecontextCONTROL_VALUE_UNPRIVILEGED;\r
+ }\r
+\r
+ /* Store the current stack pointer. This value is programmed in\r
+ * the PSP register on context switch. */\r
+ xSecureContextHandle->pucCurrentStackPointer = ( uint8_t * ) pulCurrentStackPointer;\r
+ }\r
+ #else /* configENABLE_MPU */\r
+ {\r
+ /* Current SP is set to the starting of the stack. This\r
+ * value programmed in the PSP register on context switch. */\r
+ xSecureContextHandle->pucCurrentStackPointer = xSecureContextHandle->pucStackStart;\r
+\r
+ }\r
+ #endif /* configENABLE_MPU */\r
+ }\r
+ else\r
+ {\r
+ /* Free the context to avoid memory leak and make sure to return\r
+ * NULL to indicate failure. */\r
+ vPortFree( xSecureContextHandle );\r
+ xSecureContextHandle = NULL;\r
+ }\r
+ }\r
+ }\r
+\r
+ return xSecureContextHandle;\r
}\r
/*-----------------------------------------------------------*/\r
\r
secureportNON_SECURE_CALLABLE void SecureContext_FreeContext( SecureContextHandle_t xSecureContextHandle )\r
{\r
- uint32_t ulIPSR;\r
+ uint32_t ulIPSR;\r
\r
- /* Read the Interrupt Program Status Register (IPSR) value. */\r
- secureportREAD_IPSR( ulIPSR );\r
+ /* Read the Interrupt Program Status Register (IPSR) value. */\r
+ secureportREAD_IPSR( ulIPSR );\r
\r
- /* Do nothing if the processor is running in the Thread Mode. IPSR is zero\r
- * when the processor is running in the Thread Mode. */\r
- if( ulIPSR != 0 )\r
- {\r
- /* Ensure that valid parameters are passed. */\r
- secureportASSERT( xSecureContextHandle != NULL );\r
+ /* Do nothing if the processor is running in the Thread Mode. IPSR is zero\r
+ * when the processor is running in the Thread Mode. */\r
+ if( ulIPSR != 0 )\r
+ {\r
+ /* Ensure that valid parameters are passed. */\r
+ secureportASSERT( xSecureContextHandle != NULL );\r
\r
- /* Free the stack space. */\r
- vPortFree( xSecureContextHandle->pucStackLimit );\r
+ /* Free the stack space. */\r
+ vPortFree( xSecureContextHandle->pucStackLimit );\r
\r
- /* Free the context itself. */\r
- vPortFree( xSecureContextHandle );\r
- }\r
+ /* Free the context itself. */\r
+ vPortFree( xSecureContextHandle );\r
+ }\r
}\r
/*-----------------------------------------------------------*/\r
projects / freertos / blobdiff