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https://github.com/projectacrn/acrn-hypervisor.git
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e75cca64c8
This patch represents TSC freqeuency in KHz using a 32-bit unsigned integer.
The conversion macros between ticks and us/ms are changed to inline functions to
enforce the types of the input parameters. Note that us_to_ticks accepts only
uint32_t (~4K us at most) and never overflows.
Results of some unit tests on the conversion functions:
calibrate_tsc, tsc_khz=1881600
64us -> ticks: 120422
64us -> ticks -> us: 63
511us -> ticks: 961497
511us -> ticks -> us: 510
1280000 ticks -> us: 680
1280000 ticks -> us -> ticks: 1279488
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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