/* * Copyright (C) 2018 Intel Corporation. All rights reserved. * * SPDX-License-Identifier: BSD-3-Clause */ #include void udelay(uint32_t us) { uint64_t dest_tsc, delta_tsc; /* Calculate number of ticks to wait */ delta_tsc = us_to_ticks(us); dest_tsc = rdtsc() + delta_tsc; /* Loop until time expired */ while (rdtsc() < dest_tsc) { } }