Subversion Repositories HelenOS

Rev

Rev 1780 | Rev 1881 | 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 
 
1705 cejka 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>
1 jermar 42 
 
1258 palkovsky 43 
#include <ipc/sysipc.h>
44 
 
413 jermar 45 
/** Disable interrupts.
46 
 *
47 
 * @return Old interrupt priority level.
48 
 */
49 
ipl_t interrupts_disable(void)
1 jermar 50 
{
413 jermar 51 
    ipl_t ipl = (ipl_t) cp0_status_read();
52 
    cp0_status_write(ipl & ~cp0_status_ie_enabled_bit);
53 
    return ipl;
1 jermar 54 
}
55 
 
413 jermar 56 
/** Enable interrupts.
57 
 *
58 
 * @return Old interrupt priority level.
59 
 */
60 
ipl_t interrupts_enable(void)
1 jermar 61 
{
413 jermar 62 
    ipl_t ipl = (ipl_t) cp0_status_read();
63 
    cp0_status_write(ipl | cp0_status_ie_enabled_bit);
64 
    return ipl;
1 jermar 65 
}
66 
 
413 jermar 67 
/** Restore interrupt priority level.
68 
 *
69 
 * @param ipl Saved interrupt priority level.
70 
 */
71 
void interrupts_restore(ipl_t ipl)
1 jermar 72 
{
413 jermar 73 
    cp0_status_write(cp0_status_read() | (ipl & cp0_status_ie_enabled_bit));
1 jermar 74 
}
75 
 
413 jermar 76 
/** Read interrupt priority level.
77 
 *
78 
 * @return Current interrupt priority level.
79 
 */
80 
ipl_t interrupts_read(void)
1 jermar 81 
{
125 jermar 82 
    return cp0_status_read();
1 jermar 83 
}
84 
 
1434 palkovsky 85 
/* TODO: This is SMP unsafe!!! */
86 
static unsigned long nextcount;
87 
/** Start hardware clock */
88 
static void timer_start(void)
89 
{
90 
    nextcount = cp0_compare_value + cp0_count_read();
91 
    cp0_compare_write(nextcount);
92 
}
93 
 
958 jermar 94 
static void timer_exception(int n, istate_t *istate)
575 palkovsky 95 
{
1434 palkovsky 96 
    unsigned long drift;
97 
 
98 
    drift = cp0_count_read() - nextcount;
99 
    while (drift > cp0_compare_value) {
100 
        drift -= cp0_compare_value;
101 
        CPU->missed_clock_ticks++;
102 
    }
103 
    nextcount = cp0_count_read() + cp0_compare_value - drift;
104 
    cp0_compare_write(nextcount);
575 palkovsky 105 
    clock();
106 
}
107 
 
958 jermar 108 
static void swint0(int n, istate_t *istate)
575 palkovsky 109 
{
110 
    cp0_cause_write(cp0_cause_read() & ~(1 << 8)); /* clear SW0 interrupt */
1258 palkovsky 111 
    ipc_irq_send_notif(0);
575 palkovsky 112 
}
113 
 
958 jermar 114 
static void swint1(int n, istate_t *istate)
575 palkovsky 115 
{
116 
    cp0_cause_write(cp0_cause_read() & ~(1 << 9)); /* clear SW1 interrupt */
1258 palkovsky 117 
    ipc_irq_send_notif(1);
575 palkovsky 118 
}
119 
 
120 
/* Initialize basic tables for exception dispatching */
121 
void interrupt_init(void)
122 
{
590 palkovsky 123 
    int_register(TIMER_IRQ, "timer", timer_exception);
124 
    int_register(0, "swint0", swint0);
125 
    int_register(1, "swint1", swint1);
1434 palkovsky 126 
    timer_start();
1 jermar 127 
}
1258 palkovsky 128 
 
129 
static void ipc_int(int n, istate_t *istate)
130 
{
131 
    ipc_irq_send_notif(n-INT_OFFSET);
132 
}
133 
 
134 
/* Reregister irq to be IPC-ready */
1780 jermar 135 
void irq_ipc_bind_arch(unative_t irq)
1258 palkovsky 136 
{
137 
    /* Do not allow to redefine timer */
138 
    /* Swint0, Swint1 are already handled */
139 
    if (irq == TIMER_IRQ || irq < 2)
140 
        return;
141 
    int_register(irq, "ipc_int", ipc_int);
142 
}
1702 cejka 143 
 
144 
 /** @}
145 
 */
146