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