Subversion Repositories HelenOS

Rev

Rev 2071 | Rev 2439 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
1 jermar 1
/*
2071 jermar 2
 * Copyright (c) 2001-2004 Jakub Jermar
1 jermar 3
 * All rights reserved.
4
 *
5
 * Redistribution and use in source and binary forms, with or without
6
 * modification, are permitted provided that the following conditions
7
 * are met:
8
 *
9
 * - Redistributions of source code must retain the above copyright
10
 *   notice, this list of conditions and the following disclaimer.
11
 * - Redistributions in binary form must reproduce the above copyright
12
 *   notice, this list of conditions and the following disclaimer in the
13
 *   documentation and/or other materials provided with the distribution.
14
 * - The name of the author may not be used to endorse or promote products
15
 *   derived from this software without specific prior written permission.
16
 *
17
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
 */
28
 
1754 jermar 29
/** @addtogroup ia32   
1702 cejka 30
 * @{
31
 */
1754 jermar 32
/**
33
 * @file
34
 * @brief PIC driver.
35
 *
36
 * Programmable Interrupt Controller for UP systems based on i8259 chip.
1702 cejka 37
 */
38
 
1477 decky 39
#include <arch/drivers/i8259.h>
1 jermar 40
#include <cpu.h>
41
#include <arch/types.h>
42
#include <arch/asm.h>
43
#include <arch.h>
195 vana 44
#include <print.h>
576 palkovsky 45
#include <interrupt.h>
1 jermar 46
 
958 jermar 47
static void pic_spurious(int n, istate_t *istate);
576 palkovsky 48
 
1 jermar 49
void i8259_init(void)
50
{
51
    /* ICW1: this is ICW1, ICW4 to follow */
52
    outb(PIC_PIC0PORT1, PIC_ICW1 | PIC_NEEDICW4);
53
 
54
    /* ICW2: IRQ 0 maps to INT IRQBASE */
55
    outb(PIC_PIC0PORT2, IVT_IRQBASE);
125 jermar 56
 
1 jermar 57
    /* ICW3: pic1 using IRQ IRQ_PIC1 */
58
    outb(PIC_PIC0PORT2, 1 << IRQ_PIC1);
125 jermar 59
 
60
    /* ICW4: i8086 mode */
1 jermar 61
    outb(PIC_PIC0PORT2, 1);
62
 
63
    /* ICW1: ICW1, ICW4 to follow */
64
    outb(PIC_PIC1PORT1, PIC_ICW1 | PIC_NEEDICW4);
65
 
125 jermar 66
    /* ICW2: IRQ 8 maps to INT (IVT_IRQBASE + 8) */
1 jermar 67
    outb(PIC_PIC1PORT2, IVT_IRQBASE + 8);
68
 
305 jermar 69
    /* ICW3: pic1 is known as IRQ_PIC1 */
302 palkovsky 70
    outb(PIC_PIC1PORT2, IRQ_PIC1);
1 jermar 71
 
125 jermar 72
    /* ICW4: i8086 mode */
1 jermar 73
    outb(PIC_PIC1PORT2, 1);
74
 
75
    /*
76
     * Register interrupt handler for the PIC spurious interrupt.
77
     */
958 jermar 78
    exc_register(VECTOR_PIC_SPUR, "pic_spurious", (iroutine) pic_spurious);
1 jermar 79
 
80
    /*
81
     * Set the enable/disable IRQs handlers.
82
     * Set the End-of-Interrupt handler.
83
     */
84
    enable_irqs_function = pic_enable_irqs;
85
    disable_irqs_function = pic_disable_irqs;
86
    eoi_function = pic_eoi;
125 jermar 87
 
1 jermar 88
    pic_disable_irqs(0xffff);       /* disable all irq's */
2107 jermar 89
    pic_enable_irqs(1 << IRQ_PIC1);     /* but enable pic1 */
1 jermar 90
}
91
 
1780 jermar 92
void pic_enable_irqs(uint16_t irqmask)
1 jermar 93
{
1780 jermar 94
    uint8_t x;
125 jermar 95
 
1 jermar 96
    if (irqmask & 0xff) {
125 jermar 97
        x = inb(PIC_PIC0PORT2);
1 jermar 98
        outb(PIC_PIC0PORT2, x & (~(irqmask & 0xff)));
99
    }
100
    if (irqmask >> 8) {
125 jermar 101
        x = inb(PIC_PIC1PORT2);
1 jermar 102
        outb(PIC_PIC1PORT2, x & (~(irqmask >> 8)));
103
    }
104
}
105
 
1780 jermar 106
void pic_disable_irqs(uint16_t irqmask)
1 jermar 107
{
1780 jermar 108
    uint8_t x;
125 jermar 109
 
1 jermar 110
    if (irqmask & 0xff) {
125 jermar 111
        x = inb(PIC_PIC0PORT2);
1 jermar 112
        outb(PIC_PIC0PORT2, x | (irqmask & 0xff));
113
    }
114
    if (irqmask >> 8) {
125 jermar 115
        x = inb(PIC_PIC1PORT2);
1 jermar 116
        outb(PIC_PIC1PORT2, x | (irqmask >> 8));
117
    }
118
}
119
 
120
void pic_eoi(void)
121
{
2107 jermar 122
    outb(0x20, 0x20);
123
    outb(0xa0, 0x20);
1 jermar 124
}
125
 
958 jermar 126
void pic_spurious(int n, istate_t *istate)
1 jermar 127
{
1667 jermar 128
#ifdef CONFIG_DEBUG
15 jermar 129
    printf("cpu%d: PIC spurious interrupt\n", CPU->id);
1667 jermar 130
#endif
1 jermar 131
}
1702 cejka 132
 
1754 jermar 133
/** @}
1702 cejka 134
 */