When ARM_NONSECURE_PREEMPTIBLE_SECURE_CALLS is enabled, if FPU is
being used (CONTROL.FPCA == 1), store all FP registers before
entering the secure function, and restore them afterwards.
This is needed if any NS thread or ISR that interrupts the secure
function uses FP registers. If they do, a secure UsageFault occurs
unless this change is applied.
This allows k_sched_lock() and k_sched_unlock() to be dropped when
ARM_NONSECURE_PREEMPTIBLE_SECURE_CALLS is enabled.
Enable ARM_NONSECURE_PREEMPTIBLE_SECURE_CALLS by default when
building TF-M.
Signed-off-by: Øyvind Rønningstad <oyvind.ronningstad@nordicsemi.no>
Prevent a thread from being preempted, while executing a Secure
function. This is required to prevent system crashes that could
occur if a thead context switch is triggered in the middle of a
Secure call.
Signed-off-by: Ioannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no>
To allow using TFM NS interface without enabling
CMSIS_RTOS V2 support. And to allow using TFM NS
code that uses logging.
Signed-off-by: Øyvind Rønningstad <oyvind.ronningstad@nordicsemi.no>
Signed-off-by: Ioannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no>
The TF-M NS interface needs to be initialized before
it is used. We add an initialization function that
calls tfm_ns_interface_init(), at boot time, so then
we can use TF-M interface calls (veneers).
Signed-off-by: Ioannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no>
