1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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 __FBSDID("$FreeBSD$"); 31 32 #include "opt_bhyve_snapshot.h" 33 34 #include <sys/param.h> 35 #include <sys/queue.h> 36 #include <sys/kernel.h> 37 #include <sys/malloc.h> 38 #include <sys/systm.h> 39 40 #include <machine/vmm.h> 41 #include <machine/vmm_snapshot.h> 42 43 #include "vpmtmr.h" 44 45 /* 46 * The ACPI Power Management timer is a free-running 24- or 32-bit 47 * timer with a frequency of 3.579545MHz 48 * 49 * This implementation will be 32-bits 50 */ 51 52 #define PMTMR_FREQ 3579545 /* 3.579545MHz */ 53 54 struct vpmtmr { 55 sbintime_t freq_sbt; 56 sbintime_t baseuptime; 57 uint32_t baseval; 58 }; 59 60 static MALLOC_DEFINE(M_VPMTMR, "vpmtmr", "bhyve virtual acpi timer"); 61 62 struct vpmtmr * 63 vpmtmr_init(struct vm *vm) 64 { 65 struct vpmtmr *vpmtmr; 66 struct bintime bt; 67 68 vpmtmr = malloc(sizeof(struct vpmtmr), M_VPMTMR, M_WAITOK | M_ZERO); 69 vpmtmr->baseuptime = sbinuptime(); 70 vpmtmr->baseval = 0; 71 72 FREQ2BT(PMTMR_FREQ, &bt); 73 vpmtmr->freq_sbt = bttosbt(bt); 74 75 return (vpmtmr); 76 } 77 78 void 79 vpmtmr_cleanup(struct vpmtmr *vpmtmr) 80 { 81 82 free(vpmtmr, M_VPMTMR); 83 } 84 85 int 86 vpmtmr_handler(struct vm *vm, int vcpuid, bool in, int port, int bytes, 87 uint32_t *val) 88 { 89 struct vpmtmr *vpmtmr; 90 sbintime_t now, delta; 91 92 if (!in || bytes != 4) 93 return (-1); 94 95 vpmtmr = vm_pmtmr(vm); 96 97 /* 98 * No locking needed because 'baseuptime' and 'baseval' are 99 * written only during initialization. 100 */ 101 now = sbinuptime(); 102 delta = now - vpmtmr->baseuptime; 103 KASSERT(delta >= 0, ("vpmtmr_handler: uptime went backwards: " 104 "%#lx to %#lx", vpmtmr->baseuptime, now)); 105 *val = vpmtmr->baseval + delta / vpmtmr->freq_sbt; 106 107 return (0); 108 } 109 110 #ifdef BHYVE_SNAPSHOT 111 int 112 vpmtmr_snapshot(struct vpmtmr *vpmtmr, struct vm_snapshot_meta *meta) 113 { 114 int ret; 115 116 SNAPSHOT_VAR_OR_LEAVE(vpmtmr->baseval, meta, ret, done); 117 118 done: 119 return (ret); 120 } 121 #endif 122