Get current kernel time in ticks since boot. * Returns 64-bit monotonically increasing tick count. * Used by SYS_SYSTEM_CLOCK syscall for userspace time queries. * * ATOMICITY: Disables interrupts to prevent torn reads on 32-bit ARM. * Without this, the timer ISR could update ktimer_now between reading * the low and high words, producing non-monotonic or corrupted values. */
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