FreeBSD/Linux Kernel Cross Reference
sys/amd64/vmm/io/vpmtmr.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * 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 "opt_bhyve_snapshot.h"
    
    #include <sys/param.h>
    #include <sys/queue.h>
    #include <sys/kernel.h>
    #include <sys/malloc.h>
    #include <sys/systm.h>
    
    #include <machine/vmm.h>
    #include <machine/vmm_snapshot.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, 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);
   }
   
   #ifdef BHYVE_SNAPSHOT
   int
   vpmtmr_snapshot(struct vpmtmr *vpmtmr, struct vm_snapshot_meta *meta)
   {
           int ret;
   
           SNAPSHOT_VAR_OR_LEAVE(vpmtmr->baseval, meta, ret, done);
   
   done:
           return (ret);
   }
   #endif

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