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https://github.com/projectacrn/acrn-hypervisor.git
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4642269248
vHPET is used as a source of system timer by UEFI (e.g. OVMF). This provides an alternative to using vPIT, which OVMF assumes is always connected to vPIC. This is ported from Bhyve, with a few changes: - move to user space, using acrn_timer - enable timers only when necessary Origin: FreeBSD License: BSD-3-Clause URL: https://svnweb.freebsd.org/ commit: 326257 Purpose: Adding vHPET support. Maintained-by: External Tracked-On: #2319 Signed-off-by: Peter Fang <peter.fang@intel.com> Acked-by: Anthony Xu <anthony.xu@intel.com>
56 lines
1.2 KiB
C
56 lines
1.2 KiB
C
/*
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* Copyright (C) <2018> Intel Corporation
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#ifndef _TIMER_H_
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#define _TIMER_H_
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#include <sys/param.h>
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struct acrn_timer {
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int32_t fd;
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int32_t clockid;
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struct mevent *mevp;
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void (*callback)(void *, uint64_t);
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void *callback_param;
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};
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int32_t
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acrn_timer_init(struct acrn_timer *timer, void (*cb)(void *, uint64_t), void *param);
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void
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acrn_timer_deinit(struct acrn_timer *timer);
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int32_t
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acrn_timer_settime(struct acrn_timer *timer, const struct itimerspec *new_value);
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int32_t
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acrn_timer_settime_abs(struct acrn_timer *timer,
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const struct itimerspec *new_value);
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int32_t
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acrn_timer_gettime(struct acrn_timer *timer, struct itimerspec *cur_value);
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#define NS_PER_SEC (1000000000ULL)
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static inline uint64_t
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ts_to_ticks(const uint32_t freq, const struct timespec *const ts)
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{
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uint64_t tv_sec_ticks, tv_nsec_ticks;
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tv_sec_ticks = ts->tv_sec * freq;
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tv_nsec_ticks = (ts->tv_nsec * freq) / NS_PER_SEC;
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return tv_sec_ticks + tv_nsec_ticks;
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}
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static inline void
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ticks_to_ts(const uint32_t freq, const uint64_t ticks,
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struct timespec *const ts)
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{
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uint64_t ns;
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ns = howmany(ticks * NS_PER_SEC, freq);
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ts->tv_sec = ns / NS_PER_SEC;
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ts->tv_nsec = ns % NS_PER_SEC;
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}
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#endif /* _VTIMER_ */
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