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Diffstat (limited to 'usr.sbin/bhyve/pmtmr.c')
| -rw-r--r-- | usr.sbin/bhyve/pmtmr.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/usr.sbin/bhyve/pmtmr.c b/usr.sbin/bhyve/pmtmr.c new file mode 100644 index 0000000..78d14eb --- /dev/null +++ b/usr.sbin/bhyve/pmtmr.c @@ -0,0 +1,108 @@ +/*- + * Copyright (c) 2012 NetApp, Inc. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/types.h> +#include <sys/sysctl.h> +#include <sys/time.h> +#include <machine/cpufunc.h> + +#include <stdio.h> +#include <time.h> +#include <assert.h> +#include <pthread.h> + +#include "inout.h" + +/* + * The ACPI Power Management timer is a free-running 24- or 32-bit + * timer with a frequency of 3.579545MHz + * + * This implementation will be 32-bits + */ + +#define IO_PMTMR 0x408 /* 4-byte i/o port for the timer */ + +#define PMTMR_FREQ 3579545 /* 3.579545MHz */ + +static pthread_mutex_t pmtmr_mtx; +static uint64_t pmtmr_tscf; +static uint64_t pmtmr_old; +static uint64_t pmtmr_tsc_old; + +static uint32_t +pmtmr_val(void) +{ + uint64_t pmtmr_tsc_new; + uint64_t pmtmr_new; + static int inited = 0; + + if (!inited) { + size_t len; + uint32_t tmpf; + + inited = 1; + pthread_mutex_init(&pmtmr_mtx, NULL); + len = sizeof(tmpf); + sysctlbyname("machdep.tsc_freq", &tmpf, &len, + NULL, 0); + pmtmr_tscf = tmpf; + pmtmr_tsc_old = rdtsc(); + pmtmr_old = pmtmr_tsc_old / pmtmr_tscf * PMTMR_FREQ; + return (pmtmr_old); + } + + pthread_mutex_lock(&pmtmr_mtx); + pmtmr_tsc_new = rdtsc(); + pmtmr_new = (pmtmr_tsc_new - pmtmr_tsc_old) * PMTMR_FREQ / pmtmr_tscf + + pmtmr_old; + pmtmr_old = pmtmr_new; + pmtmr_tsc_old = pmtmr_tsc_new; + pthread_mutex_unlock(&pmtmr_mtx); + + return (pmtmr_new); +} + +static int +pmtmr_handler(struct vmctx *ctx, int vcpu, int in, int port, int bytes, + uint32_t *eax, void *arg) +{ + assert(in == 1); + + if (bytes != 4) + return (-1); + + *eax = pmtmr_val(); + + return (0); +} + +INOUT_PORT(pmtmr, IO_PMTMR, IOPORT_F_IN, pmtmr_handler); + |
