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/* $Id: bs3-cmn-PicSetup.c $ */
/** @file
* BS3Kit - PIC Setup.
*/
/*
* 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>
#include "bs3-cmn-pic.h"
/**
* Configures the PIC, once only.
*
* Subsequent calls to this function will not do anything.
*
* The PIC will be programmed to use IDT/IVT vectors 0x70 thru 0x7f, auto
* end-of-interrupt, and all IRQs masked. The individual PIC users will have to
* use #Bs3PicUpdateMask unmask their IRQ once they've got all the handlers
* installed.
*/
#undef Bs3PicSetup
BS3_CMN_DEF(void, Bs3PicSetup,(bool fForcedReInit))
{
/*
* The first call configures the PIC to send interrupts to vectors 0x70 thru 0x7f,
* masking all of them. Things producing IRQs is responsible for configure their
* handlers and then(!) use Bs3PicUpdateMask to unmask the IRQ.
*/
if (!g_fBs3PicConfigured || fForcedReInit)
{
g_fBs3PicConfigured = true;
/* Start init. */
ASMOutU8(BS3_PIC_PORT_MASTER, BS3_PIC_CMD_INIT | BS3_PIC_CMD_INIT_F_4STEP);
ASMOutU8(BS3_PIC_PORT_SLAVE, BS3_PIC_CMD_INIT | BS3_PIC_CMD_INIT_F_4STEP);
/* Set IRQ base. */
ASMOutU8(BS3_PIC_PORT_MASTER + 1, 0x70);
ASMOutU8(BS3_PIC_PORT_SLAVE + 1, 0x78);
/* Dunno. */
ASMOutU8(BS3_PIC_PORT_MASTER + 1, 4);
ASMOutU8(BS3_PIC_PORT_SLAVE + 1, 2);
/* Set IRQ base. */
ASMOutU8(BS3_PIC_PORT_MASTER + 1, BS3_PIC_I4_F_AUTO_EOI);
ASMOutU8(BS3_PIC_PORT_SLAVE + 1, BS3_PIC_I4_F_AUTO_EOI);
/* Mask everything. */
ASMOutU8(BS3_PIC_PORT_MASTER + 1, UINT8_MAX);
ASMOutU8(BS3_PIC_PORT_SLAVE + 1, UINT8_MAX);
}
}
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