1 files changed, 67 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PitIrqHandler.c b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PitIrqHandler.c
new file mode 100644
index 00000000..6e65085a
--- /dev/null
+++ b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PitIrqHandler.c
@@ -0,0 +1,67 @@
+/* $Id: bs3-cmn-PitIrqHandler.c $ */
+/** @file
+ * BS3Kit - The PIT IRQ Handler and associated data.
+ */
+
+/*
+ * Copyright (C) 2007-2019 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include "bs3kit-template-header.h"
+#include <iprt/asm-amd64-x86.h>
+
+
+/*********************************************************************************************************************************
+*   Global Variables                                                                                                             *
+*********************************************************************************************************************************/
+#if ARCH_BITS == 16
+/** Nano seconds (approx) since last the PIT timer was started. */
+uint64_t volatile   g_cBs3PitNs    = 0;
+/** Milliseconds seconds (very approx) since last the PIT timer was started. */
+uint64_t volatile   g_cBs3PitMs    = 0;
+/** Number of ticks since last the PIT timer was started.  */
+uint32_t volatile   g_cBs3PitTicks = 0;
+/** The current interval in nanon seconds.  */
+uint32_t            g_cBs3PitIntervalNs = 0;
+/** The current interval in milliseconds (approximately).
+ * This is 0 if not yet started (used for checking the state internally). */
+uint16_t volatile   g_cBs3PitIntervalMs = 0;
+/** The current PIT frequency (approximately).  0 if not yet started.  */
+uint16_t            g_cBs3PitIntervalHz = 0;
+#endif
+
+
+BS3_DECL_NEAR_CALLBACK(void) BS3_CMN_NM(bs3PitIrqHandler)(PBS3TRAPFRAME pTrapFrame)
+{
+    uint16_t cMsIntercal = g_cBs3PitIntervalMs;
+    if (cMsIntercal)
+    {
+        g_cBs3PitMs += cMsIntercal;
+        g_cBs3PitNs += g_cBs3PitIntervalNs;
+        g_cBs3PitTicks++;
+    }
+    NOREF(pTrapFrame);
+    ASMOutU8(0x20, 0x20); /** @todo function! */
+}
+