Subversion Repositories HelenOS

Rev

Rev 1936 | Rev 2071 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
1 jermar 1
/*
319 jermar 2
 * Copyright (C) 2003-2004 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
 
1881 jermar 29
/** @addtogroup mips32interrupt
1702 cejka 30
 * @{
31
 */
32
/** @file
33
 */
34
 
575 palkovsky 35
#include <interrupt.h>
1 jermar 36
#include <arch/interrupt.h>
37
#include <arch/types.h>
38
#include <arch.h>
39
#include <arch/cp0.h>
40
#include <time/clock.h>
332 palkovsky 41
#include <arch/drivers/arc.h>
1258 palkovsky 42
#include <ipc/sysipc.h>
1936 decky 43
#include <ddi/device.h>
44
#include <ddi/irq.h>
1258 palkovsky 45
 
1936 decky 46
#define IRQ_COUNT 8
47
#define TIMER_IRQ 7
48
 
1955 decky 49
function virtual_timer_fnc = NULL;
1936 decky 50
static irq_t timer_irq;
51
 
413 jermar 52
/** Disable interrupts.
53
 *
54
 * @return Old interrupt priority level.
55
 */
56
ipl_t interrupts_disable(void)
1 jermar 57
{
413 jermar 58
    ipl_t ipl = (ipl_t) cp0_status_read();
59
    cp0_status_write(ipl & ~cp0_status_ie_enabled_bit);
60
    return ipl;
1 jermar 61
}
62
 
413 jermar 63
/** Enable interrupts.
64
 *
65
 * @return Old interrupt priority level.
66
 */
67
ipl_t interrupts_enable(void)
1 jermar 68
{
413 jermar 69
    ipl_t ipl = (ipl_t) cp0_status_read();
70
    cp0_status_write(ipl | cp0_status_ie_enabled_bit);
71
    return ipl;
1 jermar 72
}
73
 
413 jermar 74
/** Restore interrupt priority level.
75
 *
76
 * @param ipl Saved interrupt priority level.
77
 */
78
void interrupts_restore(ipl_t ipl)
1 jermar 79
{
413 jermar 80
    cp0_status_write(cp0_status_read() | (ipl & cp0_status_ie_enabled_bit));
1 jermar 81
}
82
 
413 jermar 83
/** Read interrupt priority level.
84
 *
85
 * @return Current interrupt priority level.
86
 */
87
ipl_t interrupts_read(void)
1 jermar 88
{
125 jermar 89
    return cp0_status_read();
1 jermar 90
}
91
 
1434 palkovsky 92
/* TODO: This is SMP unsafe!!! */
93
static unsigned long nextcount;
94
/** Start hardware clock */
95
static void timer_start(void)
96
{
97
    nextcount = cp0_compare_value + cp0_count_read();
98
    cp0_compare_write(nextcount);
99
}
100
 
1936 decky 101
static irq_ownership_t timer_claim(void)
575 palkovsky 102
{
1936 decky 103
    return IRQ_ACCEPT;
104
}
105
 
106
static void timer_irq_handler(irq_t *irq, void *arg, ...)
107
{
1434 palkovsky 108
    unsigned long drift;
109
 
110
    drift = cp0_count_read() - nextcount;
111
    while (drift > cp0_compare_value) {
112
        drift -= cp0_compare_value;
113
        CPU->missed_clock_ticks++;
114
    }
115
    nextcount = cp0_count_read() + cp0_compare_value - drift;
116
    cp0_compare_write(nextcount);
575 palkovsky 117
    clock();
1936 decky 118
 
1955 decky 119
    if (virtual_timer_fnc != NULL)
120
        virtual_timer_fnc();
575 palkovsky 121
}
122
 
123
/* Initialize basic tables for exception dispatching */
124
void interrupt_init(void)
125
{
1936 decky 126
    irq_init(IRQ_COUNT, IRQ_COUNT);
127
 
128
    irq_initialize(&timer_irq);
129
    timer_irq.devno = device_assign_devno();
130
    timer_irq.inr = TIMER_IRQ;
131
    timer_irq.claim = timer_claim;
132
    timer_irq.handler = timer_irq_handler;
133
    irq_register(&timer_irq);
134
 
1434 palkovsky 135
    timer_start();
1936 decky 136
    cp0_unmask_int(TIMER_IRQ);
1 jermar 137
}
1258 palkovsky 138
 
1881 jermar 139
/** @}
1702 cejka 140
 */