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arch: arm: internal API to enable/disable SAU

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This commit defines and implements the internal ARM TrustZone
API to enable or disable the Security Attribution Unit.

Signed-off-by: Ioannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no>
This commit is contained in:
Ioannis Glaropoulos 2018-03-23 09:42:53 +01:00 committed by Anas Nashif
parent 034499af1a
commit de78430072
2 changed files with 43 additions and 0 deletions
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14
arch/arm/core/cortex_m/tz/arm_core_tz.c
View file

@ -50,3 +50,17 @@ void tz_nonsecure_state_setup(const tz_nonsecure_setup_conf_t *p_ns_conf)
configure_nonsecure_control(p_ns_conf->control_ns.spsel,
p_ns_conf->control_ns.npriv);
}
void tz_sau_configure(int enable, int allns)
{
if (enable) {
TZ_SAU_Enable();
} else {
TZ_SAU_Disable();
if (allns) {
SAU->CTRL |= SAU_CTRL_ALLNS_Msk;
} else {
SAU->CTRL &= ~(SAU_CTRL_ALLNS_Msk);
}
}
}

29
arch/arm/include/cortex_m/tz.h
View file

@ -66,6 +66,35 @@ typedef struct tz_nonsecure_setup_conf {
*/
void tz_nonsecure_state_setup(const tz_nonsecure_setup_conf_t *p_ns_conf);
/**
*
* @brief Configure SAU
*
* Configure (enable or disable) the ARMv8-M Security Attribution Unit.
*
* @param enable SAU enable flag: 1 if SAU is to be enabled, 0 if SAU is
* to be disabled.
* @param allns SAU_CTRL.ALLNS flag: select 1 to set SAU_CTRL.ALLNS, 0
* to clear SAU_CTRL.ALLNS.
*
* Notes:
*
* SAU_CTRL.ALLNS bit: All Non-secure. When SAU_CTRL.ENABLE is 0
* this bit controls if the memory is marked as Non-secure or Secure.
* Values:
* Secure (not Non-Secure Callable): 0
* Non-Secure: 1
*
* This function shall only be called from Secure state, otherwise the
* Non-Secure instance of SAU_CTRL register is RAZ/WI.
*
* This function shall be called before the Secure Firmware may transition
* to Non-Secure state.
*
* @return N/A
*/
void tz_sau_configure(int enable, int allns);
#endif /* _ASMLANGUAGE */
#ifdef __cplusplus