tz-ns-cfg.c

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/*
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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/**
 * \file
 *   Normal-world nRF5340 hooks for the TrustZone API.
 *
 *   Provides the NS-side wake mechanism that the secure side pends
 *   via tz_arch_signal_ns. EGU0_IRQn is borrowed as a software-only
 *   doorbell: the EGU peripheral itself is unused, only its NVIC slot.
 */
 
#include "contiki.h"
#include "trustzone/normal/tz-normal.h"
 
#include <nrfx.h>
 
/*---------------------------------------------------------------------------*/
void
tz_arch_init_ns_signal(void)
{
  /*
   * Do not clear pending before enabling: the only source of an EGU0
   * pending bit is a deliberate tz_arch_signal_ns() from secure code,
   * so clearing here would silently discard a legitimate wake request.
   */
  NVIC_EnableIRQ(EGU0_IRQn);
}
/*---------------------------------------------------------------------------*/
void
EGU0_IRQHandler(void)
{
  tz_normal_request_poll();
}
/*---------------------------------------------------------------------------*/