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| Rev | Author | Line No. | Line |
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| 510 | jermar | 1 | /* |
| 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 | |||
| 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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| 607 | palkovsky | 37 | #include <func.h> |
| 38 | #include <print.h> |
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| 631 | palkovsky | 39 | #include <arch/atomic.h> |
| 510 | jermar | 40 | |
| 41 | /** Standard input character device. */ |
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| 42 | chardev_t *stdin = NULL; |
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| 575 | palkovsky | 43 | chardev_t *stdout = NULL; |
| 510 | jermar | 44 | |
| 601 | palkovsky | 45 | /** Get character from character device. Do not echo character. |
| 588 | palkovsky | 46 | * |
| 47 | * @param chardev Character device. |
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| 48 | * |
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| 49 | * @return Character read. |
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| 50 | */ |
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| 601 | palkovsky | 51 | __u8 _getc(chardev_t *chardev) |
| 588 | palkovsky | 52 | { |
| 53 | __u8 ch; |
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| 54 | ipl_t ipl; |
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| 55 | |||
| 631 | palkovsky | 56 | if (atomic_get(&haltstate)) { |
| 607 | palkovsky | 57 | /* If we are here, we are hopefully on the processor, that |
| 58 | * issued the 'halt' command, so proceed to read the character |
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| 59 | * directly from input |
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| 60 | */ |
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| 61 | if (chardev->op->read) |
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| 62 | return chardev->op->read(chardev); |
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| 63 | /* no other way of interacting with user, halt */ |
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| 631 | palkovsky | 64 | if (CPU) |
| 65 | printf("cpu%d: ", CPU->id); |
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| 66 | else |
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| 67 | printf("cpu: "); |
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| 68 | printf("halted - no kconsole\n"); |
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| 607 | palkovsky | 69 | cpu_halt(); |
| 70 | } |
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| 71 | |||
| 588 | palkovsky | 72 | waitq_sleep(&chardev->wq); |
| 73 | ipl = interrupts_disable(); |
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| 74 | spinlock_lock(&chardev->lock); |
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| 75 | ch = chardev->buffer[(chardev->index - chardev->counter) % CHARDEV_BUFLEN]; |
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| 76 | chardev->counter--; |
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| 77 | spinlock_unlock(&chardev->lock); |
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| 78 | interrupts_restore(ipl); |
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| 79 | |||
| 80 | chardev->op->resume(chardev); |
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| 81 | |||
| 82 | return ch; |
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| 83 | } |
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| 84 | |||
| 510 | jermar | 85 | /** Get string from character device. |
| 86 | * |
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| 87 | * Read characters from character device until first occurrence |
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| 88 | * of newline character. |
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| 89 | * |
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| 90 | * @param chardev Character device. |
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| 517 | jermar | 91 | * @param buf Buffer where to store string terminated by '\0'. |
| 510 | jermar | 92 | * @param len Size of the buffer. |
| 517 | jermar | 93 | * |
| 94 | * @return Number of characters read. |
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| 510 | jermar | 95 | */ |
| 517 | jermar | 96 | count_t gets(chardev_t *chardev, char *buf, size_t buflen) |
| 510 | jermar | 97 | { |
| 98 | index_t index = 0; |
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| 99 | char ch; |
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| 100 | |||
| 101 | while (index < buflen) { |
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| 588 | palkovsky | 102 | ch = _getc(chardev); |
| 103 | if (ch == '\b') { |
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| 104 | if (index > 0) { |
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| 105 | index--; |
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| 106 | /* Space backspace, space */ |
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| 107 | putchar('\b'); |
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| 108 | putchar(' '); |
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| 109 | putchar('\b'); |
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| 110 | } |
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| 111 | continue; |
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| 112 | } |
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| 113 | putchar(ch); |
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| 114 | |||
| 510 | jermar | 115 | if (ch == '\n') { /* end of string => write 0, return */ |
| 517 | jermar | 116 | buf[index] = '\0'; |
| 117 | return (count_t) index; |
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| 510 | jermar | 118 | } |
| 517 | jermar | 119 | buf[index++] = ch; |
| 510 | jermar | 120 | } |
| 517 | jermar | 121 | return (count_t) index; |
| 510 | jermar | 122 | } |
| 123 | |||
| 588 | palkovsky | 124 | /** Get character from device & echo it to screen */ |
| 510 | jermar | 125 | __u8 getc(chardev_t *chardev) |
| 126 | { |
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| 127 | __u8 ch; |
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| 128 | |||
| 588 | palkovsky | 129 | ch = _getc(chardev); |
| 130 | putchar(ch); |
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| 510 | jermar | 131 | return ch; |
| 132 | } |
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| 575 | palkovsky | 133 | |
| 134 | void putchar(char c) |
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| 135 | { |
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| 607 | palkovsky | 136 | if (stdout->op->write) |
| 137 | stdout->op->write(stdout, c); |
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| 575 | palkovsky | 138 | } |