Subversion Repositories HelenOS-historic

Rev

Rev 1708 | 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 
 */
1780 jermar 79 
uint8_t _getc(chardev_t *chardev)
588 palkovsky 80 
{
1780 jermar 81 
    uint8_t ch;
588 palkovsky 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'.
1708 jermar 120 
 * @param buflen 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 */
1780 jermar 153 
uint8_t getc(chardev_t *chardev)
510 jermar 154 
{
1780 jermar 155 
    uint8_t ch;
510 jermar 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