| 0,0 → 1,67 |
|---|
| /* |
| * Copyright (C) 2005 Jakub Jermar |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include <console/chardev.h> |
| #include <putchar.h> |
| #include <synch/waitq.h> |
| #include <synch/spinlock.h> |
| |
| /** Initialize character device. |
| * |
| * @param chardev Character device. |
| * @param op Implementation of character device operations. |
| */ |
| void chardev_initialize(chardev_t *chardev, chardev_operations_t *op) |
| { |
| waitq_initialize(&chardev->wq); |
| spinlock_initialize(&chardev->lock); |
| chardev->counter = 0; |
| chardev->index = 0; |
| chardev->op = op; |
| } |
| |
| /** Push character read from input character device. |
| * |
| * @param chardev Character device. |
| * @param ch Character being pushed. |
| */ |
| void chardev_push_character(chardev_t *chardev, __u8 ch) |
| { |
| spinlock_lock(&chardev->lock); |
| chardev->counter++; |
| if (chardev->counter == CHARDEV_BUFLEN - 1) { |
| /* buffer full => disable device interrupt */ |
| chardev->op->suspend(); |
| } |
| |
| putchar(ch); |
| chardev->buffer[chardev->index++] = ch; |
| chardev->index = chardev->index % CHARDEV_BUFLEN; /* index modulo size of buffer */ |
| waitq_wakeup(&chardev->wq, WAKEUP_FIRST); |
| spinlock_unlock(&chardev->lock); |
| } |