Subversion Repositories HelenOS

Rev

Rev 4263 | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
510 jermar 1
/*
2071 jermar 2
 * Copyright (c) 2005 Jakub Jermar
510 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
 
1888 jermar 29
/** @addtogroup genericconsole
1702 cejka 30
 * @{
31
 */
32
/** @file
33
 */
34
 
510 jermar 35
#include <console/chardev.h>
36
#include <synch/waitq.h>
37
#include <synch/spinlock.h>
4327 mejdrech 38
#include <print.h>
39
#include <func.h>
40
#include <arch.h>
510 jermar 41
 
4153 mejdrech 42
/** Initialize input character device.
511 jermar 43
 *
4153 mejdrech 44
 * @param indev Input character device.
45
 * @param op    Implementation of input character device operations.
46
 *
511 jermar 47
 */
4153 mejdrech 48
void indev_initialize(char *name, indev_t *indev,
49
    indev_operations_t *op)
510 jermar 50
{
4153 mejdrech 51
    indev->name = name;
52
    waitq_initialize(&indev->wq);
53
    spinlock_initialize(&indev->lock, "indev");
54
    indev->counter = 0;
55
    indev->index = 0;
56
    indev->op = op;
510 jermar 57
}
511 jermar 58
 
59
/** Push character read from input character device.
60
 *
4153 mejdrech 61
 * @param indev Input character device.
62
 * @param ch    Character being pushed.
63
 *
511 jermar 64
 */
4263 mejdrech 65
void indev_push_character(indev_t *indev, wchar_t ch)
511 jermar 66
{
4153 mejdrech 67
    ASSERT(indev);
68
 
69
    spinlock_lock(&indev->lock);
70
    if (indev->counter == INDEV_BUFLEN - 1) {
71
        /* Buffer full */
72
        spinlock_unlock(&indev->lock);
73
        return;
511 jermar 74
    }
990 decky 75
 
4153 mejdrech 76
    indev->counter++;
77
    indev->buffer[indev->index++] = ch;
78
 
79
    /* Index modulo size of buffer */
80
    indev->index = indev->index % INDEV_BUFLEN;
81
    waitq_wakeup(&indev->wq, WAKEUP_FIRST);
82
    spinlock_unlock(&indev->lock);
511 jermar 83
}
1702 cejka 84
 
4327 mejdrech 85
/** Pop character from input character device.
86
 *
87
 * @param indev Input character device.
88
 *
89
 * @return Character read.
90
 *
91
 */
92
wchar_t indev_pop_character(indev_t *indev)
93
{
94
    if (atomic_get(&haltstate)) {
95
        /* If we are here, we are hopefully on the processor that
96
         * issued the 'halt' command, so proceed to read the character
97
         * directly from input
98
         */
99
        if (check_poll(indev))
100
            return indev->op->poll(indev);
101
 
102
        /* No other way of interacting with user */
103
        interrupts_disable();
104
 
105
        if (CPU)
106
            printf("cpu%u: ", CPU->id);
107
        else
108
            printf("cpu: ");
109
 
110
        printf("halted (no polling input)\n");
111
        cpu_halt();
112
    }
113
 
114
    waitq_sleep(&indev->wq);
115
    ipl_t ipl = interrupts_disable();
116
    spinlock_lock(&indev->lock);
117
    wchar_t ch = indev->buffer[(indev->index - indev->counter) % INDEV_BUFLEN];
118
    indev->counter--;
119
    spinlock_unlock(&indev->lock);
120
    interrupts_restore(ipl);
121
 
122
    return ch;
123
}
124
 
4153 mejdrech 125
/** Initialize output character device.
126
 *
127
 * @param outdev Output character device.
128
 * @param op     Implementation of output character device operations.
129
 *
130
 */
131
void outdev_initialize(char *name, outdev_t *outdev,
132
    outdev_operations_t *op)
133
{
134
    outdev->name = name;
135
    spinlock_initialize(&outdev->lock, "outdev");
136
    outdev->op = op;
137
}
138
 
4327 mejdrech 139
bool check_poll(indev_t *indev)
140
{
141
    if (indev == NULL)
142
        return false;
143
 
144
    if (indev->op == NULL)
145
        return false;
146
 
147
    return (indev->op->poll != NULL);
148
}
149
 
1888 jermar 150
/** @}
1702 cejka 151
 */