1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
/* $Id: bs3-cmn-PicSetup.c $ */
/** @file
* BS3Kit - PIC Setup.
*/
/*
* Copyright (C) 2007-2019 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE 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.
*/
/*********************************************************************************************************************************
* 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,(void))
{
/*
* 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)
{
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);
}
}
|
