2 * Copyright (c) 2012 NetApp, Inc.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/types.h>
33 #include <sys/sysctl.h>
35 #include <machine/cpufunc.h>
45 * The ACPI Power Management timer is a free-running 24- or 32-bit
46 * timer with a frequency of 3.579545MHz
48 * This implementation will be 32-bits
51 #define IO_PMTMR 0x408 /* 4-byte i/o port for the timer */
53 #define PMTMR_FREQ 3579545 /* 3.579545MHz */
55 static pthread_mutex_t pmtmr_mtx;
56 static uint64_t pmtmr_tscf;
57 static uint64_t pmtmr_old;
58 static uint64_t pmtmr_tsc_old;
63 uint64_t pmtmr_tsc_new;
65 static int inited = 0;
71 pthread_mutex_init(&pmtmr_mtx, NULL);
72 len = sizeof(pmtmr_tscf);
73 sysctlbyname("machdep.tsc_freq", &pmtmr_tscf, &len,
75 pmtmr_tsc_old = rdtsc();
76 pmtmr_old = pmtmr_tsc_old / pmtmr_tscf * PMTMR_FREQ;
79 pthread_mutex_lock(&pmtmr_mtx);
80 pmtmr_tsc_new = rdtsc();
81 pmtmr_new = (pmtmr_tsc_new - pmtmr_tsc_old) * PMTMR_FREQ / pmtmr_tscf +
83 pmtmr_old = pmtmr_new;
84 pmtmr_tsc_old = pmtmr_tsc_new;
85 pthread_mutex_unlock(&pmtmr_mtx);
91 pmtmr_handler(struct vmctx *ctx, int vcpu, int in, int port, int bytes,
92 uint32_t *eax, void *arg)
104 INOUT_PORT(pmtmr, IO_PMTMR, IOPORT_F_IN, pmtmr_handler);