← Back to branch summary

~vojtech-horky/helenos/helenos-qemu

« back to all changes in this revision

Viewing changes to kernel/arch/ppc32/src/interrupt.c

  • Committer: Martin Decky
  • Date: 2009-08-04 11:19:19 UTC
  • Revision ID: martin@uranus.dsrg.hide.ms.mff.cuni.cz-20090804111919-evyclddlr3v5lhmp
Initial import

Show diffs side-by-side

added added

removed removed

Lines of Context:
kernel/arch/ppc32/src/interrupt.c
 
1
/*
 
2
 * Copyright (c) 2006 Martin Decky
 
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
 
 
29
/** @addtogroup ppc32interrupt
 
30
 * @{
 
31
 */
 
32
/** @file
 
33
 */
 
34
 
 
35
#include <ddi/irq.h>
 
36
#include <interrupt.h>
 
37
#include <arch/interrupt.h>
 
38
#include <arch/types.h>
 
39
#include <arch.h>
 
40
#include <time/clock.h>
 
41
#include <ipc/sysipc.h>
 
42
#include <arch/drivers/pic.h>
 
43
#include <arch/mm/tlb.h>
 
44
#include <print.h>
 
45
 
 
46
 
 
47
void start_decrementer(void)
 
48
{
 
49
        asm volatile (
 
50
                "mtdec %0\n"
 
51
                :
 
52
                : "r" (1000)
 
53
        );
 
54
}
 
55
 
 
56
 
 
57
/** Handler of external interrupts */
 
58
static void exception_external(int n, istate_t *istate)
 
59
{
 
60
        int inum;
 
61
        
 
62
        while ((inum = pic_get_pending()) != -1) {
 
63
                irq_t *irq = irq_dispatch_and_lock(inum);
 
64
                if (irq) {
 
65
                        /*
 
66
                         * The IRQ handler was found.
 
67
                         */
 
68
                        
 
69
                        if (irq->preack) {
 
70
                                /* Acknowledge the interrupt before processing */
 
71
                                if (irq->cir)
 
72
                                        irq->cir(irq->cir_arg, irq->inr);
 
73
                        }
 
74
                        
 
75
                        irq->handler(irq);
 
76
                        
 
77
                        if (!irq->preack) {
 
78
                                if (irq->cir)
 
79
                                        irq->cir(irq->cir_arg, irq->inr);
 
80
                        }
 
81
                        
 
82
                        spinlock_unlock(&irq->lock);
 
83
                } else {
 
84
                        /*
 
85
                         * Spurious interrupt.
 
86
                         */
 
87
#ifdef CONFIG_DEBUG
 
88
                        printf("cpu%u: spurious interrupt (inum=%d)\n", CPU->id, inum);
 
89
#endif
 
90
                }
 
91
        }
 
92
}
 
93
 
 
94
 
 
95
static void exception_decrementer(int n, istate_t *istate)
 
96
{
 
97
        start_decrementer();
 
98
        clock();
 
99
}
 
100
 
 
101
 
 
102
/* Initialize basic tables for exception dispatching */
 
103
void interrupt_init(void)
 
104
{
 
105
        exc_register(VECTOR_DATA_STORAGE, "data_storage", pht_refill);
 
106
        exc_register(VECTOR_INSTRUCTION_STORAGE, "instruction_storage", pht_refill);
 
107
        exc_register(VECTOR_EXTERNAL, "external", exception_external);
 
108
        exc_register(VECTOR_DECREMENTER, "timer", exception_decrementer);
 
109
}
 
110
 
 
111
/** @}
 
112
 */