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/* $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! */
}
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