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