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