1 files changed, 104 insertions, 0 deletions
diff --git a/sys/amd64/vmm/io/vpmtmr.c b/sys/amd64/vmm/io/vpmtmr.c
new file mode 100644
index 0000000..09f763f
--- /dev/null
+++ b/sys/amd64/vmm/io/vpmtmr.c
@@ -0,0 +1,104 @@
+/*-
+ * Copyright (c) 2014, Neel Natu (neel@freebsd.org)
+ * 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 unmodified, 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 THE AUTHOR ``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 THE AUTHOR 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/queue.h>
+#include <sys/cpuset.h>
+#include <sys/kernel.h>
+#include <sys/malloc.h>
+#include <sys/systm.h>
+
+#include <machine/vmm.h>
+
+#include "vpmtmr.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 PMTMR_FREQ	3579545  /* 3.579545MHz */
+
+struct vpmtmr {
+	sbintime_t	freq_sbt;
+	sbintime_t	baseuptime;
+	uint32_t	baseval;
+};
+
+static MALLOC_DEFINE(M_VPMTMR, "vpmtmr", "bhyve virtual acpi timer");
+
+struct vpmtmr *
+vpmtmr_init(struct vm *vm)
+{
+	struct vpmtmr *vpmtmr;
+	struct bintime bt;
+
+	vpmtmr = malloc(sizeof(struct vpmtmr), M_VPMTMR, M_WAITOK | M_ZERO);
+	vpmtmr->baseuptime = sbinuptime();
+	vpmtmr->baseval = 0;
+
+	FREQ2BT(PMTMR_FREQ, &bt);
+	vpmtmr->freq_sbt = bttosbt(bt);
+
+	return (vpmtmr);
+}
+
+void
+vpmtmr_cleanup(struct vpmtmr *vpmtmr)
+{
+
+	free(vpmtmr, M_VPMTMR);
+}
+
+int
+vpmtmr_handler(struct vm *vm, int vcpuid, bool in, int port, int bytes,
+    uint32_t *val)
+{
+	struct vpmtmr *vpmtmr;
+	sbintime_t now, delta;
+
+	if (!in || bytes != 4)
+		return (-1);
+
+	vpmtmr = vm_pmtmr(vm);
+
+	/*
+	 * No locking needed because 'baseuptime' and 'baseval' are
+	 * written only during initialization.
+	 */
+	now = sbinuptime();
+	delta = now - vpmtmr->baseuptime;
+	KASSERT(delta >= 0, ("vpmtmr_handler: uptime went backwards: "
+	    "%#lx to %#lx", vpmtmr->baseuptime, now));
+	*val = vpmtmr->baseval + delta / vpmtmr->freq_sbt;
+
+	return (0);
+}