106 lines
2.8 KiB
C
106 lines
2.8 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2014, Neel Natu (neel@freebsd.org)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/queue.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/systm.h>
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#include <machine/vmm.h>
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#include "vpmtmr.h"
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/*
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* The ACPI Power Management timer is a free-running 24- or 32-bit
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* timer with a frequency of 3.579545MHz
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*
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* This implementation will be 32-bits
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*/
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#define PMTMR_FREQ 3579545 /* 3.579545MHz */
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struct vpmtmr {
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sbintime_t freq_sbt;
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sbintime_t baseuptime;
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uint32_t baseval;
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};
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static MALLOC_DEFINE(M_VPMTMR, "vpmtmr", "bhyve virtual acpi timer");
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struct vpmtmr *
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vpmtmr_init(struct vm *vm)
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{
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struct vpmtmr *vpmtmr;
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struct bintime bt;
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vpmtmr = malloc(sizeof(struct vpmtmr), M_VPMTMR, M_WAITOK | M_ZERO);
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vpmtmr->baseuptime = sbinuptime();
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vpmtmr->baseval = 0;
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FREQ2BT(PMTMR_FREQ, &bt);
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vpmtmr->freq_sbt = bttosbt(bt);
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return (vpmtmr);
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}
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void
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vpmtmr_cleanup(struct vpmtmr *vpmtmr)
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{
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free(vpmtmr, M_VPMTMR);
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}
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int
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vpmtmr_handler(struct vm *vm, int vcpuid, bool in, int port, int bytes,
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uint32_t *val)
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{
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struct vpmtmr *vpmtmr;
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sbintime_t now, delta;
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if (!in || bytes != 4)
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return (-1);
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vpmtmr = vm_pmtmr(vm);
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/*
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* No locking needed because 'baseuptime' and 'baseval' are
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* written only during initialization.
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*/
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now = sbinuptime();
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delta = now - vpmtmr->baseuptime;
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KASSERT(delta >= 0, ("vpmtmr_handler: uptime went backwards: "
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"%#lx to %#lx", vpmtmr->baseuptime, now));
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*val = vpmtmr->baseval + delta / vpmtmr->freq_sbt;
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return (0);
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}
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