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arch: arm: define and implement ARM IRQ target state API

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This commit contributes the definition and the implementation
of an API for ARM MCUs to configure and get the configuration
of the security state targeted by a given external IRQ line.
The API is only available in Secure ARM Firmware.

Signed-off-by: Ioannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no>
This commit is contained in:
Ioannis Glaropoulos 2018-03-21 14:10:47 +01:00 • committed by Carles Cufí
commit 7a864bb79b
1 changed files with 56 additions and 0 deletions
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56
arch/arm/core/irq_manage.c
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@ -187,3 +187,59 @@ void _arch_isr_direct_header(void)
}
#endif
#if defined(CONFIG_ARM_SECURE_FIRMWARE)
/**
*
* @brief Set the target security state for the given IRQ
*
* Function sets the security state (Secure or Non-Secure) targeted
* by the given irq. It requires ARMv8-M MCU.
* It is only compiled if ARM_SECURE_FIRMWARE is defined.
* It should only be called while in Secure state, otherwise, a write attempt
* to NVIC.ITNS register is write-ignored(WI), as the ITNS register is not
* banked between security states and, therefore, has no Non-Secure instance.
*
* It shall assert if the operation is not performed successfully.
*
* @param irq IRQ line
* @param secure_state 1 if target state is Secure, 0 otherwise.
*
* @return N/A
*/
void irq_target_state_set(unsigned int irq, int secure_state)
{
if (secure_state) {
/* Set target to Secure */
if (NVIC_ClearTargetState(irq) != 0) {
__ASSERT(0, "NVIC SetTargetState error");
}
} else {
/* Set target state to Non-Secure */
if (NVIC_SetTargetState(irq) != 1) {
__ASSERT(0, "NVIC SetTargetState error");
}
}
}
/**
*
* @brief Determine whether the given IRQ targets the Secure state
*
* Function determines whether the given irq targets the Secure state
* or not (i.e. targets the Non-Secure state). It requires ARMv8-M MCU.
* It is only compiled if ARM_SECURE_FIRMWARE is defined.
* It should only be called while in Secure state, otherwise, a read attempt
* to NVIC.ITNS register is read-as-zero(RAZ), as the ITNS register is not
* banked between security states and, therefore, has no Non-Secure instance.
*
* @param irq IRQ line
*
* @return 1 if target state is Secure, 0 otherwise.
*/
int irq_target_state_is_secure(unsigned int irq)
{
return NVIC_GetTargetState(irq) == 0;
}
#endif /* CONFIG_ARM_SECURE_FIRMWARE */