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/* $Id: bs3-cmn-PitIrqHandler.c $ */
/** @file
* BS3Kit - The PIT IRQ Handler and associated data.
*/
/*
* Copyright (C) 2007-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* 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; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox 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.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* 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 g_cBs3PitIntervalMs = 0;
/** The current PIT frequency (approximately). 0 if not yet started. */
uint16_t volatile g_cBs3PitIntervalHz = 0;
#endif
BS3_DECL_NEAR_CALLBACK(void) BS3_CMN_NM(bs3PitIrqHandler)(PBS3TRAPFRAME pTrapFrame)
{
if (g_cBs3PitIntervalHz)
{
g_cBs3PitMs += g_cBs3PitIntervalMs;
g_cBs3PitNs += g_cBs3PitIntervalNs;
g_cBs3PitTicks++;
}
NOREF(pTrapFrame);
ASMOutU8(0x20, 0x20); /** @todo function! */
}
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