Subversion Repositories HelenOS-historic

Rev

Rev 1104 | Rev 1708 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
510 jermar 1
/*
2
 * Copyright (C) 2003 Josef Cejka
3
 * Copyright (C) 2005 Jakub Jermar
4
 * All rights reserved.
5
 *
6
 * Redistribution and use in source and binary forms, with or without
7
 * modification, are permitted provided that the following conditions
8
 * are met:
9
 *
10
 * - Redistributions of source code must retain the above copyright
11
 *   notice, this list of conditions and the following disclaimer.
12
 * - Redistributions in binary form must reproduce the above copyright
13
 *   notice, this list of conditions and the following disclaimer in the
14
 *   documentation and/or other materials provided with the distribution.
15
 * - The name of the author may not be used to endorse or promote products
16
 *   derived from this software without specific prior written permission.
17
 *
18
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28
 */
29
 
1702 cejka 30
 /** @addtogroup genericconsole
31
 * @{
32
 */
33
/** @file
34
 */
35
 
510 jermar 36
#include <console/console.h>
37
#include <console/chardev.h>
38
#include <synch/waitq.h>
39
#include <synch/spinlock.h>
40
#include <arch/types.h>
41
#include <typedefs.h>
42
#include <arch.h>
607 palkovsky 43
#include <func.h>
44
#include <print.h>
1104 jermar 45
#include <atomic.h>
510 jermar 46
 
1050 palkovsky 47
#define BUFLEN 2048
48
static char debug_buffer[BUFLEN];
49
static size_t offset = 0;
50
/** Initialize stdout to something that does not print, but does not fail
51
 *
52
 * Save data in some buffer so that it could be retrieved in the debugger
53
 */
54
static void null_putchar(chardev_t *d, const char ch)
55
{
56
    if (offset >= BUFLEN)
57
        offset = 0;
58
    debug_buffer[offset++] = ch;
59
}
60
 
61
static chardev_operations_t null_stdout_ops = {
62
    .write = null_putchar
63
};
64
chardev_t null_stdout = {
65
    .name = "null",
66
    .op = &null_stdout_ops
67
};
68
 
510 jermar 69
/** Standard input character device. */
70
chardev_t *stdin = NULL;
1050 palkovsky 71
chardev_t *stdout = &null_stdout;
510 jermar 72
 
601 palkovsky 73
/** Get character from character device. Do not echo character.
588 palkovsky 74
 *
75
 * @param chardev Character device.
76
 *
77
 * @return Character read.
78
 */
601 palkovsky 79
__u8 _getc(chardev_t *chardev)
588 palkovsky 80
{
81
    __u8 ch;
82
    ipl_t ipl;
83
 
631 palkovsky 84
    if (atomic_get(&haltstate)) {
607 palkovsky 85
        /* If we are here, we are hopefully on the processor, that
86
         * issued the 'halt' command, so proceed to read the character
87
         * directly from input
88
         */
89
        if (chardev->op->read)
90
            return chardev->op->read(chardev);
91
        /* no other way of interacting with user, halt */
631 palkovsky 92
        if (CPU)
93
            printf("cpu%d: ", CPU->id);
94
        else
95
            printf("cpu: ");
96
        printf("halted - no kconsole\n");
607 palkovsky 97
        cpu_halt();
98
    }
99
 
588 palkovsky 100
    waitq_sleep(&chardev->wq);
101
    ipl = interrupts_disable();
102
    spinlock_lock(&chardev->lock);
103
    ch = chardev->buffer[(chardev->index - chardev->counter) % CHARDEV_BUFLEN];
104
    chardev->counter--;
105
    spinlock_unlock(&chardev->lock);
106
    interrupts_restore(ipl);
107
 
108
    chardev->op->resume(chardev);
109
 
110
    return ch;
111
}
112
 
510 jermar 113
/** Get string from character device.
114
 *
115
 * Read characters from character device until first occurrence
116
 * of newline character.
117
 *
118
 * @param chardev Character device.
517 jermar 119
 * @param buf Buffer where to store string terminated by '\0'.
510 jermar 120
 * @param len Size of the buffer.
517 jermar 121
 *
122
 * @return Number of characters read.
510 jermar 123
 */
517 jermar 124
count_t gets(chardev_t *chardev, char *buf, size_t buflen)
510 jermar 125
{
126
    index_t index = 0;
127
    char ch;
128
 
129
    while (index < buflen) {
588 palkovsky 130
        ch = _getc(chardev);
131
        if (ch == '\b') {
132
            if (index > 0) {
133
                index--;
134
                /* Space backspace, space */
135
                putchar('\b');
136
                putchar(' ');
137
                putchar('\b');
138
            }
139
            continue;
140
        }
141
        putchar(ch);
142
 
510 jermar 143
        if (ch == '\n') { /* end of string => write 0, return */
517 jermar 144
            buf[index] = '\0';
145
            return (count_t) index;
510 jermar 146
        }
517 jermar 147
        buf[index++] = ch;
510 jermar 148
    }
517 jermar 149
    return (count_t) index;
510 jermar 150
}
151
 
588 palkovsky 152
/** Get character from device & echo it to screen */
510 jermar 153
__u8 getc(chardev_t *chardev)
154
{
155
    __u8 ch;
156
 
588 palkovsky 157
    ch = _getc(chardev);
158
    putchar(ch);
510 jermar 159
    return ch;
160
}
575 palkovsky 161
 
162
void putchar(char c)
163
{
607 palkovsky 164
    if (stdout->op->write)
165
        stdout->op->write(stdout, c);
575 palkovsky 166
}
1702 cejka 167
 
168
 /** @}
169
 */
170