1 files changed, 102 insertions, 0 deletions
diff --git a/arch/arm/mvp/mvpkm/montimer_kernel.c b/arch/arm/mvp/mvpkm/montimer_kernel.c
new file mode 100644
index 0000000..e2f8ef8
--- /dev/null
+++ b/arch/arm/mvp/mvpkm/montimer_kernel.c
@@ -0,0 +1,102 @@
+/*
+ * Linux 2.6.32 and later Kernel module for VMware MVP Hypervisor Support
+ *
+ * Copyright (C) 2010-2012 VMware, Inc. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; see the file COPYING.  If not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+#line 5
+
+/**
+ *  @file
+ *
+ *  @brief MVP host kernel implementation of monitor timers
+ *
+ * The monitor sends requests that are simply a 64-bit absolute time that it
+ * wants a reply.  If it changes its mind, it simply sends a different 64-bit
+ * absolute time.  It is tolerant of us replying too soon, so if we miss the
+ * update to a later time, it doesn't matter, the monitor will re-send the
+ * request for the later time.  The only time we should miss an update to a
+ * sooner time is when we are about to send the reply to the old time anyway,
+ * in which case the monitor sees a reply as quickly as we can generate them,
+ * so no harm there either.
+ */
+
+#include <linux/module.h>
+#include <linux/hrtimer.h>
+
+#include "mvp.h"
+#include "mvp_timer.h"
+#include "actions.h"
+#include "mvpkm_kernel.h"
+
+/**
+ * @brief Linux timer callback
+ * @param timer The linux timer raised
+ * @return Status to not restart the timer
+ */
+static enum hrtimer_restart
+MonitorTimerCB(struct hrtimer *timer)
+{
+   MvpkmVM *vm = container_of(timer, MvpkmVM, monTimer.timer);
+   Mvpkm_WakeGuest(vm, ACTION_TIMER);
+   return HRTIMER_NORESTART;
+}
+
+/**
+ * @brief Initialize vm associated timer
+ * @param vm  which virtual machine we're running
+ */
+void
+MonitorTimer_Setup(MvpkmVM *vm)
+{
+   MonTimer *monTimer = &vm->monTimer;
+   monTimer->vm = vm;
+
+   hrtimer_init(&monTimer->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
+   monTimer->timer.function = MonitorTimerCB;
+}
+
+/**
+ * @brief New timer request from monitor
+ * @param monTimer Monitor timer
+ * @param when64 Timer target value
+ */
+void
+MonitorTimer_Request(MonTimer *monTimer, uint64 when64)
+{
+   if (when64) {
+      ktime_t kt;
+
+      /*
+       * Simple conversion, assuming RATE64 is 1e+9
+       */
+      kt = ns_to_ktime(when64);
+      ASSERT_ON_COMPILE(MVP_TIMER_RATE64 == 1000000000);
+
+      /*
+       * Start the timer.  If it was already active, it will remove
+       * the previous expiration time.  Linux handles correctly timer
+       * with deadline in the past, and forces a safety minimal delta
+       * for closer timer deadlines.
+       */
+      hrtimer_start(&monTimer->timer, kt, HRTIMER_MODE_ABS);
+   } else {
+      /*
+       * Cancel a pending request.  If there is none, this will do nothing.
+       * If it's too late, monitor tolerance will forgive us.
+       */
+      hrtimer_cancel(&monTimer->timer);
+   }
+}