Subversion Repositories HelenOS

Rev

Rev 2089 | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
510 jermar 1 
/*
2071 jermar 2 
 * Copyright (c) 2003 Josef Cejka
3 
 * Copyright (c) 2005 Jakub Jermar
510 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 
 
1888 jermar 30 
/** @addtogroup genericconsole
1702 cejka 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 <arch.h>
607 palkovsky 42 
#include <func.h>
43 
#include <print.h>
1104 jermar 44 
#include <atomic.h>
510 jermar 45 
 
1050 palkovsky 46 
#define BUFLEN 2048
47 
static char debug_buffer[BUFLEN];
48 
static size_t offset = 0;
49 
/** Initialize stdout to something that does not print, but does not fail
50 
 *
51 
 * Save data in some buffer so that it could be retrieved in the debugger
52 
 */
53 
static void null_putchar(chardev_t *d, const char ch)
54 
{
55 
    if (offset >= BUFLEN)
56 
        offset = 0;
57 
    debug_buffer[offset++] = ch;
58 
}
59 
 
60 
static chardev_operations_t null_stdout_ops = {
61 
    .write = null_putchar
62 
};
63 
chardev_t null_stdout = {
64 
    .name = "null",
65 
    .op = &null_stdout_ops
66 
};
67 
 
510 jermar 68 
/** Standard input character device. */
69 
chardev_t *stdin = NULL;
1050 palkovsky 70 
chardev_t *stdout = &null_stdout;
510 jermar 71 
 
601 palkovsky 72 
/** Get character from character device. Do not echo character.
588 palkovsky 73 
 *
74 
 * @param chardev Character device.
75 
 *
76 
 * @return Character read.
77 
 */
1780 jermar 78 
uint8_t _getc(chardev_t *chardev)
588 palkovsky 79 
{
1780 jermar 80 
    uint8_t ch;
588 palkovsky 81 
    ipl_t ipl;
82 
 
631 palkovsky 83 
    if (atomic_get(&haltstate)) {
607 palkovsky 84 
        /* If we are here, we are hopefully on the processor, that
85 
         * issued the 'halt' command, so proceed to read the character
86 
         * directly from input
87 
         */
88 
        if (chardev->op->read)
89 
            return chardev->op->read(chardev);
90 
        /* no other way of interacting with user, halt */
631 palkovsky 91 
        if (CPU)
92 
            printf("cpu%d: ", CPU->id);
93 
        else
94 
            printf("cpu: ");
95 
        printf("halted - no kconsole\n");
607 palkovsky 96 
        cpu_halt();
97 
    }
98 
 
588 palkovsky 99 
    waitq_sleep(&chardev->wq);
100 
    ipl = interrupts_disable();
101 
    spinlock_lock(&chardev->lock);
102 
    ch = chardev->buffer[(chardev->index - chardev->counter) % CHARDEV_BUFLEN];
103 
    chardev->counter--;
104 
    spinlock_unlock(&chardev->lock);
105 
    interrupts_restore(ipl);
106 
 
107 
    chardev->op->resume(chardev);
108 
 
109 
    return ch;
110 
}
111 
 
510 jermar 112 
/** Get string from character device.
113 
 *
114 
 * Read characters from character device until first occurrence
115 
 * of newline character.
116 
 *
117 
 * @param chardev Character device.
517 jermar 118 
 * @param buf Buffer where to store string terminated by '\0'.
1708 jermar 119 
 * @param buflen Size of the buffer.
517 jermar 120 
 *
121 
 * @return Number of characters read.
510 jermar 122 
 */
517 jermar 123 
count_t gets(chardev_t *chardev, char *buf, size_t buflen)
510 jermar 124 
{
125 
    index_t index = 0;
126 
    char ch;
127 
 
128 
    while (index < buflen) {
588 palkovsky 129 
        ch = _getc(chardev);
130 
        if (ch == '\b') {
131 
            if (index > 0) {
132 
                index--;
133 
                /* Space backspace, space */
134 
                putchar('\b');
135 
                putchar(' ');
136 
                putchar('\b');
137 
            }
138 
            continue;
139 
        }
140 
        putchar(ch);
141 
 
510 jermar 142 
        if (ch == '\n') { /* end of string => write 0, return */
517 jermar 143 
            buf[index] = '\0';
144 
            return (count_t) index;
510 jermar 145 
        }
517 jermar 146 
        buf[index++] = ch;
510 jermar 147 
    }
517 jermar 148 
    return (count_t) index;
510 jermar 149 
}
150 
 
588 palkovsky 151 
/** Get character from device & echo it to screen */
1780 jermar 152 
uint8_t getc(chardev_t *chardev)
510 jermar 153 
{
1780 jermar 154 
    uint8_t ch;
510 jermar 155 
 
588 palkovsky 156 
    ch = _getc(chardev);
157 
    putchar(ch);
510 jermar 158 
    return ch;
159 
}
575 palkovsky 160 
 
161 
void putchar(char c)
162 
{
607 palkovsky 163 
    if (stdout->op->write)
164 
        stdout->op->write(stdout, c);
575 palkovsky 165 
}
1702 cejka 166 
 
1888 jermar 167 
/** @}
1702 cejka 168 
 */