* Notification wait syscall handler. * Blocks caller until any notification bits in mask are set. * * Parameters: * R0: mask - notification bits to wait for (any bit triggers wake) * * Returns (R0): * Bits that were set (and are now cleared) * 0 if mask was invalid * * Blocking: Yes - caller blocks until bits arrive * * Performance: * - Non-blocking path (bits already set): ~5
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