Commit fe3cd4c8 authored by Ioannis Glaropoulos's avatar Ioannis Glaropoulos Committed by Carles Cufi
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arch: arm: convenience wrappers for C variable Non-Secure permissions 



Declare and implement convenience wrappers to evaluate Non-Secure
read and write permissions of C variables using the cmse address
range intrinsics.

Signed-off-by: default avatarIoannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no>
parent 87936612

arch/arm/include/cortex_m/cmse.h

+74 −0
Original line number Diff line number Diff line
@@ -367,6 +367,80 @@ int arm_cmse_addr_range_nonsecure_read_ok(u32_t addr, u32_t size, 
int arm_cmse_addr_range_nonsecure_readwrite_ok(u32_t addr, u32_t size,

	int force_npriv);



/**

 * @brief Non-Secure Read accessibility of an object

 *

 * Evaluates whether a given object can be read according to the

 * permissions of the Non-Secure state MPU.

 *

 * The macro shall always evaluate to zero if called from Non-Secure state.

 *

 * @param p_obj Pointer to the given object

 *              for which the readability is requested

 *

 * @pre Object is allocated in a single MPU region.

 *

 * @return p_obj if object is readable from Non-Secure state, NULL otherwise.

 */

#define ARM_CMSE_OBJECT_NONSECURE_READ_OK(p_obj) \

	cmse_check_pointed_object(p_obj, CMSE_NONSECURE | CMSE_MPU_READ)



/**

 * @brief Non-Secure Read accessibility of an object (nPRIV mode)

 *

 * Evaluates whether a given object can be read according to the

 * permissions of the Non-Secure state MPU (unprivileged read).

 *

 * The macro shall always evaluate to zero if called from Non-Secure state.

 *

 * @param p_obj Pointer to the given object

 *              for which the readability is requested

 *

 * @pre Object is allocated in a single MPU region.

 *

 * @return p_obj if object is readable from Non-Secure state, NULL otherwise.

 */

#define ARM_CMSE_OBJECT_NONSECURE_UNPRIV_READ_OK(p_obj) \

	cmse_check_pointed_object(p_obj, \

		CMSE_NONSECURE | CMSE_MPU_UNPRIV | CMSE_MPU_READ)



/**

 * @brief Non-Secure Read and Write accessibility of an object

 *

 * Evaluates whether a given object can be read and written

 * according to the permissions of the Non-Secure state MPU.

 *

 * The macro shall always evaluate to zero if called from Non-Secure state.

 *

 * @param p_obj Pointer to the given object

 *              for which the read and write ability is requested

 *

 * @pre Object is allocated in a single MPU region.

 *

 * @return p_obj if object is Non-Secure Read and Writable, NULL otherwise.

 */

#define ARM_CMSE_OBJECT_NONSECURE_READWRITE_OK(p_obj) \

	cmse_check_pointed_object(p_obj, CMSE_NONSECURE | CMSE_MPU_READWRITE)



/**

 * @brief Non-Secure Read and Write accessibility of an object (nPRIV mode)

 *

 * Evaluates whether a given object can be read and written according

 * to the permissions of the Non-Secure state MPU (unprivileged read/write).

 *

 * The macro shall always evaluate to zero if called from Non-Secure state.

 *

 * @param p_obj Pointer to the given object

 *              for which the read and write ability is requested

 *

 * @pre Object is allocated in a single MPU region.

 *

 * @return p_obj if object is Non-Secure Read and Writable, NULL otherwise.

 */

#define ARM_CMSE_OBJECT_NON_SECURE_UNPRIV_READWRITE_OK(p_obj) \

	cmse_check_pointed_object(p_obj, \

			CMSE_NONSECURE | CMSE_MPU_UNPRIV | CMSE_MPU_READWRITE)



#endif /* CONFIG_ARM_SECURE_FIRMWARE */



#endif /* _ASMLANGUAGE */

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