| 1 | /* $Id: bs3-cmn-PicSetup.c 62471 2016-07-22 18:04:30Z vboxsync $ */
|
|---|
| 2 | /** @file
|
|---|
| 3 | * BS3Kit - PIC Setup.
|
|---|
| 4 | */
|
|---|
| 5 |
|
|---|
| 6 | /*
|
|---|
| 7 | * Copyright (C) 2007-2016 Oracle Corporation
|
|---|
| 8 | *
|
|---|
| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
|
|---|
| 10 | * available from http://www.virtualbox.org. This file is free software;
|
|---|
| 11 | * you can redistribute it and/or modify it under the terms of the GNU
|
|---|
| 12 | * General Public License (GPL) as published by the Free Software
|
|---|
| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
|
|---|
| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
|
|---|
| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
|
|---|
| 16 | *
|
|---|
| 17 | * The contents of this file may alternatively be used under the terms
|
|---|
| 18 | * of the Common Development and Distribution License Version 1.0
|
|---|
| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
|
|---|
| 20 | * VirtualBox OSE distribution, in which case the provisions of the
|
|---|
| 21 | * CDDL are applicable instead of those of the GPL.
|
|---|
| 22 | *
|
|---|
| 23 | * You may elect to license modified versions of this file under the
|
|---|
| 24 | * terms and conditions of either the GPL or the CDDL or both.
|
|---|
| 25 | */
|
|---|
| 26 |
|
|---|
| 27 |
|
|---|
| 28 | /*********************************************************************************************************************************
|
|---|
| 29 | * Header Files *
|
|---|
| 30 | *********************************************************************************************************************************/
|
|---|
| 31 | #include "bs3kit-template-header.h"
|
|---|
| 32 | #include <iprt/asm-amd64-x86.h>
|
|---|
| 33 | #include "bs3-cmn-pic.h"
|
|---|
| 34 |
|
|---|
| 35 |
|
|---|
| 36 |
|
|---|
| 37 | /**
|
|---|
| 38 | * Configures the PIC, once only.
|
|---|
| 39 | *
|
|---|
| 40 | * Subsequent calls to this function will not do anything.
|
|---|
| 41 | *
|
|---|
| 42 | * The PIC will be programmed to use IDT/IVT vectors 0x70 thru 0x7f, auto
|
|---|
| 43 | * end-of-interrupt, and all IRQs masked. The individual PIC users will have to
|
|---|
| 44 | * use #Bs3PicUpdateMask unmask their IRQ once they've got all the handlers
|
|---|
| 45 | * installed.
|
|---|
| 46 | */
|
|---|
| 47 | #undef Bs3PicSetup
|
|---|
| 48 | BS3_CMN_DEF(void, Bs3PicSetup,(void))
|
|---|
| 49 | {
|
|---|
| 50 | /*
|
|---|
| 51 | * The first call configures the PIC to send interrupts to vectors 0x70 thru 0x7f,
|
|---|
| 52 | * masking all of them. Things producing IRQs is responsible for configure their
|
|---|
| 53 | * handlers and then(!) use Bs3PicUpdateMask to unmask the IRQ.
|
|---|
| 54 | */
|
|---|
| 55 | if (!g_fBs3PicConfigured)
|
|---|
| 56 | {
|
|---|
| 57 | g_fBs3PicConfigured = true;
|
|---|
| 58 |
|
|---|
| 59 | /* Start init. */
|
|---|
| 60 | ASMOutU8(BS3_PIC_PORT_MASTER, BS3_PIC_CMD_INIT | BS3_PIC_CMD_INIT_F_4STEP);
|
|---|
| 61 | ASMOutU8(BS3_PIC_PORT_SLAVE, BS3_PIC_CMD_INIT | BS3_PIC_CMD_INIT_F_4STEP);
|
|---|
| 62 |
|
|---|
| 63 | /* Set IRQ base. */
|
|---|
| 64 | ASMOutU8(BS3_PIC_PORT_MASTER + 1, 0x70);
|
|---|
| 65 | ASMOutU8(BS3_PIC_PORT_SLAVE + 1, 0x78);
|
|---|
| 66 |
|
|---|
| 67 | /* Dunno. */
|
|---|
| 68 | ASMOutU8(BS3_PIC_PORT_MASTER + 1, 4);
|
|---|
| 69 | ASMOutU8(BS3_PIC_PORT_SLAVE + 1, 2);
|
|---|
| 70 |
|
|---|
| 71 | /* Set IRQ base. */
|
|---|
| 72 | ASMOutU8(BS3_PIC_PORT_MASTER + 1, BS3_PIC_I4_F_AUTO_EOI);
|
|---|
| 73 | ASMOutU8(BS3_PIC_PORT_SLAVE + 1, BS3_PIC_I4_F_AUTO_EOI);
|
|---|
| 74 |
|
|---|
| 75 | /* Mask everything. */
|
|---|
| 76 | ASMOutU8(BS3_PIC_PORT_MASTER + 1, UINT8_MAX);
|
|---|
| 77 | ASMOutU8(BS3_PIC_PORT_SLAVE + 1, UINT8_MAX);
|
|---|
| 78 | }
|
|---|
| 79 | }
|
|---|
| 80 |
|
|---|
