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The parameter to udelay is the microseconds to wait for, which should be an unsigned integer. Signed-off-by: Junjie Mao <junjie.mao@intel.com> Acked-by: Eddie Dong <eddie.dong@intel.com>
21 lines
363 B
C
21 lines
363 B
C
/*
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* Copyright (C) 2018 Intel Corporation. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <hv_lib.h>
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void udelay(uint32_t us)
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{
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uint64_t dest_tsc, delta_tsc;
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/* Calculate number of ticks to wait */
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delta_tsc = US_TO_TICKS(us);
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dest_tsc = rdtsc() + delta_tsc;
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/* Loop until time expired */
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while
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(rdtsc() < dest_tsc);
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}
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