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