1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2014, Neel Natu (neel@freebsd.org) 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice unmodified, this list of conditions, and the following 12 * disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 #include "opt_bhyve_snapshot.h" 31 32 #include <sys/param.h> 33 #include <sys/queue.h> 34 #include <sys/kernel.h> 35 #include <sys/malloc.h> 36 #include <sys/systm.h> 37 38 #include <machine/vmm.h> 39 #include <machine/vmm_snapshot.h> 40 41 #include "vpmtmr.h" 42 43 /* 44 * The ACPI Power Management timer is a free-running 24- or 32-bit 45 * timer with a frequency of 3.579545MHz 46 * 47 * This implementation will be 32-bits 48 */ 49 50 #define PMTMR_FREQ 3579545 /* 3.579545MHz */ 51 52 struct vpmtmr { 53 sbintime_t freq_sbt; 54 sbintime_t baseuptime; 55 uint32_t baseval; 56 }; 57 58 static MALLOC_DEFINE(M_VPMTMR, "vpmtmr", "bhyve virtual acpi timer"); 59 60 struct vpmtmr * 61 vpmtmr_init(struct vm *vm) 62 { 63 struct vpmtmr *vpmtmr; 64 struct bintime bt; 65 66 vpmtmr = malloc(sizeof(struct vpmtmr), M_VPMTMR, M_WAITOK | M_ZERO); 67 vpmtmr->baseuptime = sbinuptime(); 68 vpmtmr->baseval = 0; 69 70 FREQ2BT(PMTMR_FREQ, &bt); 71 vpmtmr->freq_sbt = bttosbt(bt); 72 73 return (vpmtmr); 74 } 75 76 void 77 vpmtmr_cleanup(struct vpmtmr *vpmtmr) 78 { 79 80 free(vpmtmr, M_VPMTMR); 81 } 82 83 int 84 vpmtmr_handler(struct vm *vm, bool in, int port, int bytes, uint32_t *val) 85 { 86 struct vpmtmr *vpmtmr; 87 sbintime_t now, delta; 88 89 if (!in || bytes != 4) 90 return (-1); 91 92 vpmtmr = vm_pmtmr(vm); 93 94 /* 95 * No locking needed because 'baseuptime' and 'baseval' are 96 * written only during initialization. 97 */ 98 now = sbinuptime(); 99 delta = now - vpmtmr->baseuptime; 100 KASSERT(delta >= 0, ("vpmtmr_handler: uptime went backwards: " 101 "%#lx to %#lx", vpmtmr->baseuptime, now)); 102 *val = vpmtmr->baseval + delta / vpmtmr->freq_sbt; 103 104 return (0); 105 } 106 107 #ifdef BHYVE_SNAPSHOT 108 int 109 vpmtmr_snapshot(struct vpmtmr *vpmtmr, struct vm_snapshot_meta *meta) 110 { 111 int ret; 112 113 SNAPSHOT_VAR_OR_LEAVE(vpmtmr->baseval, meta, ret, done); 114 115 done: 116 return (ret); 117 } 118 #endif 119