| 1 | /* $Id: bs3-cmn-PicSetup.c 82968 2020-02-04 10:35:17Z vboxsync $ */
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| 2 | /** @file
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| 3 | * BS3Kit - PIC Setup.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2007-2020 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 | #include "bs3-cmn-pic.h"
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| 34 |
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| 35 |
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| 36 |
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| 37 | /**
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| 38 | * Configures the PIC, once only.
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| 39 | *
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| 40 | * Subsequent calls to this function will not do anything.
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| 41 | *
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| 42 | * The PIC will be programmed to use IDT/IVT vectors 0x70 thru 0x7f, auto
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| 43 | * end-of-interrupt, and all IRQs masked. The individual PIC users will have to
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| 44 | * use #Bs3PicUpdateMask unmask their IRQ once they've got all the handlers
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| 45 | * installed.
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| 46 | */
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| 47 | #undef Bs3PicSetup
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| 48 | BS3_CMN_DEF(void, Bs3PicSetup,(void))
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| 49 | {
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| 50 | /*
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| 51 | * The first call configures the PIC to send interrupts to vectors 0x70 thru 0x7f,
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| 52 | * masking all of them. Things producing IRQs is responsible for configure their
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| 53 | * handlers and then(!) use Bs3PicUpdateMask to unmask the IRQ.
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| 54 | */
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| 55 | if (!g_fBs3PicConfigured)
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| 56 | {
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| 57 | g_fBs3PicConfigured = true;
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| 58 |
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| 59 | /* Start init. */
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| 60 | ASMOutU8(BS3_PIC_PORT_MASTER, BS3_PIC_CMD_INIT | BS3_PIC_CMD_INIT_F_4STEP);
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| 61 | ASMOutU8(BS3_PIC_PORT_SLAVE, BS3_PIC_CMD_INIT | BS3_PIC_CMD_INIT_F_4STEP);
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| 62 |
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| 63 | /* Set IRQ base. */
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| 64 | ASMOutU8(BS3_PIC_PORT_MASTER + 1, 0x70);
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| 65 | ASMOutU8(BS3_PIC_PORT_SLAVE + 1, 0x78);
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| 66 |
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| 67 | /* Dunno. */
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| 68 | ASMOutU8(BS3_PIC_PORT_MASTER + 1, 4);
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| 69 | ASMOutU8(BS3_PIC_PORT_SLAVE + 1, 2);
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| 70 |
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| 71 | /* Set IRQ base. */
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| 72 | ASMOutU8(BS3_PIC_PORT_MASTER + 1, BS3_PIC_I4_F_AUTO_EOI);
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| 73 | ASMOutU8(BS3_PIC_PORT_SLAVE + 1, BS3_PIC_I4_F_AUTO_EOI);
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| 74 |
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| 75 | /* Mask everything. */
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| 76 | ASMOutU8(BS3_PIC_PORT_MASTER + 1, UINT8_MAX);
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| 77 | ASMOutU8(BS3_PIC_PORT_SLAVE + 1, UINT8_MAX);
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| 78 | }
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| 79 | }
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| 80 |
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