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Diffstat (limited to '')
-rw-r--r-- | src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PitIrqHandler.c | 76 |
1 files changed, 76 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..b296bb11 --- /dev/null +++ b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-PitIrqHandler.c @@ -0,0 +1,76 @@ +/* $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! */ +} + |