| 1 | /* $Id: bs3-cmn-PitIrqHandler.c 64367 2016-10-22 17:25:58Z vboxsync $ */
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| 2 | /** @file
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| 3 | * BS3Kit - The PIT IRQ Handler and associated data.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2007-2016 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 |
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| 28 | /*********************************************************************************************************************************
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| 29 | * Header Files *
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| 30 | *********************************************************************************************************************************/
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| 31 | #include "bs3kit-template-header.h"
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| 32 | #include <iprt/asm-amd64-x86.h>
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| 33 |
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| 34 |
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| 35 | /*********************************************************************************************************************************
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| 36 | * Global Variables *
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| 37 | *********************************************************************************************************************************/
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| 38 | #if ARCH_BITS == 16
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| 39 | /** Nano seconds (approx) since last the PIT timer was started. */
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| 40 | uint64_t volatile g_cBs3PitNs = 0;
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| 41 | /** Milliseconds seconds (very approx) since last the PIT timer was started. */
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| 42 | uint64_t volatile g_cBs3PitMs = 0;
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| 43 | /** Number of ticks since last the PIT timer was started. */
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| 44 | uint32_t volatile g_cBs3PitTicks = 0;
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| 45 | /** The current interval in nanon seconds. */
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| 46 | uint32_t g_cBs3PitIntervalNs = 0;
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| 47 | /** The current interval in milliseconds (approximately).
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| 48 | * This is 0 if not yet started (used for checking the state internally). */
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| 49 | uint16_t volatile g_cBs3PitIntervalMs = 0;
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| 50 | /** The current PIT frequency (approximately). 0 if not yet started. */
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| 51 | uint16_t g_cBs3PitIntervalHz = 0;
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| 52 | #endif
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| 53 |
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| 54 |
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| 55 | BS3_DECL_NEAR_CALLBACK(void) BS3_CMN_NM(bs3PitIrqHandler)(PBS3TRAPFRAME pTrapFrame)
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| 56 | {
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| 57 | uint16_t cMsIntercal = g_cBs3PitIntervalMs;
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| 58 | if (cMsIntercal)
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| 59 | {
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| 60 | g_cBs3PitMs += cMsIntercal;
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| 61 | g_cBs3PitNs += g_cBs3PitIntervalNs;
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| 62 | g_cBs3PitTicks++;
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| 63 | }
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| 64 | NOREF(pTrapFrame);
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| 65 | ASMOutU8(0x20, 0x20); /** @todo function! */
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| 66 | }
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| 67 |
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