* This function's address will be used as the write target. * We attempt to write to this location to trigger MPU fault. */

* Get interrupt number from IPSR. * Returns 0 for thread mode, 1-15 for exceptions, 16+ for IRQs. */

* Fast ISR context check using hardware IPSR register. * Returns: true if currently in exception handler, false if in thread mode. * Zero overhead:

* ipc_try_fastpath() - IPC fastpath using pre-saved R4-R11 * @caller: Current thread attempting IPC * @svc_param: SVC stack frame (R0-R3, R12, LR, P

* BASEPRI-based critical sections (blocks interrupts >= priority level). * Zero-latency ISRs at priority 0x0-0x2 can preempt kernel critical sections

* KDB command: dump unified notification system statistics * Shows both async notifications and notification mask groups */

* KDB command: Reset latency statistics. */

* KDB command: Display interrupt latency statistics. * * Shows min/avg/max latency for each priority level, highlighting * zero-latency ISRs (0x0-0

* Allocates element with specified index * * @param kt - pointer to kernel table * @param i - index of element to allocate * * @result * NULL

* Checks if element already allocated * * @param kt - pointer to kernel table * @param i - index of element to check * * @result * -1 if index

Internal notification handler for ktimer_event_create_notify(). * Posts notification to target thread when timer expires. * Returns ticks for period

* Get latency statistics for a priority level. * * Calculates average lazily on read to avoid division in ISR hot path. */

* Enable DWT cycle counter for latency measurements. * * Note: Called at INIT_LEVEL_PLATFORM with interrupts disabled. * Safe to reset statistics w

* Latency measurement helper - call at ISR exit. * * @param start_cycles Timestamp from latency_sample_start() * @param priority Interrupt priority

* Latency measurement helper - call at ISR entry. * Returns timestamp for latency_sample_end(). */

* Receiver for multi-word test. * Validates sender TID and message label. */

* Sender for multi-word test. * Uses handshake instead of fixed delay. */

* Softirq handler: process async event queue. * * CONTEXT: Softirq (interrupts enabled, preemption possible). * BATCH: Processes bounded number of

* Initialize async event subsystem. * - Allocate event pool * - Register NOTIFICATION_SOFTIRQ handler */