Subversion Repositories HelenOS

Rev

Rev 1942 | Rev 2071 | Go to most recent revision | Only display areas with differences | Ignore whitespace | Details | Blame | Last modification | View Log | RSS feed

Rev 1942 Rev 1945
1
/*
1
/*
2
 * Copyright (C) 2005 Jakub Jermar
2
 * Copyright (C) 2005 Jakub Jermar
3
 * All rights reserved.
3
 * All rights reserved.
4
 *
4
 *
5
 * Redistribution and use in source and binary forms, with or without
5
 * Redistribution and use in source and binary forms, with or without
6
 * modification, are permitted provided that the following conditions
6
 * modification, are permitted provided that the following conditions
7
 * are met:
7
 * are met:
8
 *
8
 *
9
 * - Redistributions of source code must retain the above copyright
9
 * - Redistributions of source code must retain the above copyright
10
 *   notice, this list of conditions and the following disclaimer.
10
 *   notice, this list of conditions and the following disclaimer.
11
 * - Redistributions in binary form must reproduce the above copyright
11
 * - Redistributions in binary form must reproduce the above copyright
12
 *   notice, this list of conditions and the following disclaimer in the
12
 *   notice, this list of conditions and the following disclaimer in the
13
 *   documentation and/or other materials provided with the distribution.
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
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.
15
 *   derived from this software without specific prior written permission.
16
 *
16
 *
17
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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
18
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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
23
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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
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.
26
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
 */
27
 */
28
 
28
 
29
/** @addtogroup ia64   
29
/** @addtogroup ia64   
30
 * @{
30
 * @{
31
 */
31
 */
32
/** @file
32
/** @file
33
 */
33
 */
34
 
34
 
35
/** Interval Timer driver. */
35
/** Interval Timer driver. */
36
 
36
 
37
#include <arch/drivers/it.h>
37
#include <arch/drivers/it.h>
38
#include <arch/ski/ski.h>
-
 
39
#include <arch/interrupt.h>
38
#include <arch/interrupt.h>
40
#include <arch/register.h>
39
#include <arch/register.h>
41
#include <arch/asm.h>
40
#include <arch/asm.h>
42
#include <arch/barrier.h>
41
#include <arch/barrier.h>
43
#include <time/clock.h>
42
#include <time/clock.h>
44
#include <ddi/irq.h>
43
#include <ddi/irq.h>
45
#include <ddi/device.h>
44
#include <ddi/device.h>
46
#include <arch.h>
45
#include <arch.h>
47
 
46
 
48
#define IT_SERVICE_CLOCKS 64
47
#define IT_SERVICE_CLOCKS 64
49
 
48
 
50
static irq_t it_irq;
49
static irq_t it_irq;
51
 
50
 
52
static irq_ownership_t it_claim(void);
51
static irq_ownership_t it_claim(void);
53
static void it_interrupt(irq_t *irq, void *arg, ...);
52
static void it_interrupt(irq_t *irq, void *arg, ...);
54
 
53
 
55
/** Initialize Interval Timer. */
54
/** Initialize Interval Timer. */
56
void it_init(void)
55
void it_init(void)
57
{
56
{
58
    cr_itv_t itv;
57
    cr_itv_t itv;
59
 
58
 
60
    irq_initialize(&it_irq);
59
    irq_initialize(&it_irq);
61
    it_irq.inr = INTERRUPT_TIMER;
60
    it_irq.inr = INTERRUPT_TIMER;
62
    it_irq.devno = device_assign_devno();
61
    it_irq.devno = device_assign_devno();
63
    it_irq.claim = it_claim;
62
    it_irq.claim = it_claim;
64
    it_irq.handler = it_interrupt;
63
    it_irq.handler = it_interrupt;
65
    irq_register(&it_irq);
64
    irq_register(&it_irq);
66
 
65
 
67
    /* initialize Interval Timer external interrupt vector */
66
    /* initialize Interval Timer external interrupt vector */
68
    itv.value = itv_read();
67
    itv.value = itv_read();
69
    itv.vector = INTERRUPT_TIMER;
68
    itv.vector = INTERRUPT_TIMER;
70
    itv.m = 0;
69
    itv.m = 0;
71
    itv_write(itv.value);
70
    itv_write(itv.value);
72
 
71
 
73
    /* set Interval Timer Counter to zero */
72
    /* set Interval Timer Counter to zero */
74
    itc_write(0);
73
    itc_write(0);
75
   
74
   
76
    /* generate first Interval Timer interrupt in IT_DELTA ticks */
75
    /* generate first Interval Timer interrupt in IT_DELTA ticks */
77
    itm_write(IT_DELTA);
76
    itm_write(IT_DELTA);
78
 
77
 
79
    /* propagate changes */
78
    /* propagate changes */
80
    srlz_d();
79
    srlz_d();
81
}
80
}
82
 
81
 
83
/** Always claim ownership for this IRQ.
82
/** Always claim ownership for this IRQ.
84
 *
83
 *
85
 * Other devices are responsible to avoid using INR 0.
84
 * Other devices are responsible to avoid using INR 0.
86
 *
85
 *
87
 * @return Always IRQ_ACCEPT.
86
 * @return Always IRQ_ACCEPT.
88
 */
87
 */
89
irq_ownership_t it_claim(void)
88
irq_ownership_t it_claim(void)
90
{
89
{
91
    return IRQ_ACCEPT;
90
    return IRQ_ACCEPT;
92
}
91
}
93
 
92
 
94
/** Process Interval Timer interrupt. */
93
/** Process Interval Timer interrupt. */
95
void it_interrupt(irq_t *irq, void *arg, ...)
94
void it_interrupt(irq_t *irq, void *arg, ...)
96
{
95
{
97
    int64_t c;
96
    int64_t c;
98
    int64_t m;
97
    int64_t m;
99
   
98
   
100
    eoi_write(EOI);
99
    eoi_write(EOI);
101
   
100
   
102
    m = itm_read();
101
    m = itm_read();
103
   
102
   
104
    while (1) {
103
    while (1) {
105
        c = itc_read();
104
        c = itc_read();
106
        c += IT_SERVICE_CLOCKS;
105
        c += IT_SERVICE_CLOCKS;
107
 
106
 
108
        m += IT_DELTA;
107
        m += IT_DELTA;
109
        if (m - c < 0)
108
        if (m - c < 0)
110
            CPU->missed_clock_ticks++;
109
            CPU->missed_clock_ticks++;
111
        else
110
        else
112
            break;
111
            break;
113
    }
112
    }
114
   
113
   
115
    itm_write(m);
114
    itm_write(m);
116
    srlz_d();               /* propagate changes */
115
    srlz_d();               /* propagate changes */
117
   
116
   
118
    clock();
117
    clock();
119
   
-
 
120
    /*
-
 
121
     * This one is a good candidate for moving to a separate
-
 
122
     * kernel thread private to ski.c
-
 
123
     */
-
 
124
    poll_keyboard();
-
 
125
}
118
}
126
 
119
 
127
/** @}
120
/** @}
128
 */
121
 */
129
 
122