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510 jermar 1 
/*
2071 jermar 2 
 * Copyright (c) 2005 Jakub Jermar
510 jermar 3 
 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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1888 jermar 29 
/** @addtogroup genericconsole
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 * @{
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 */
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/** @file
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 */
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#include <console/chardev.h>
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#include <synch/waitq.h>
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#include <synch/spinlock.h>
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#include <print.h>
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#include <func.h>
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#include <arch.h>
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/** Initialize input character device.
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 *
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 * @param indev Input character device.
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 * @param op    Implementation of input character device operations.
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 *
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 */
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void indev_initialize(char *name, indev_t *indev,
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    indev_operations_t *op)
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{
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    indev->name = name;
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    waitq_initialize(&indev->wq);
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    spinlock_initialize(&indev->lock, "indev");
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    indev->counter = 0;
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    indev->index = 0;
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    indev->op = op;
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}
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/** Push character read from input character device.
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 *
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 * @param indev Input character device.
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 * @param ch    Character being pushed.
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 *
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 */
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void indev_push_character(indev_t *indev, wchar_t ch)
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{
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    ASSERT(indev);
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    spinlock_lock(&indev->lock);
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    if (indev->counter == INDEV_BUFLEN - 1) {
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        /* Buffer full */
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        spinlock_unlock(&indev->lock);
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        return;
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    }
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    indev->counter++;
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    indev->buffer[indev->index++] = ch;
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    /* Index modulo size of buffer */
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    indev->index = indev->index % INDEV_BUFLEN;
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    waitq_wakeup(&indev->wq, WAKEUP_FIRST);
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    spinlock_unlock(&indev->lock);
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}
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/** Pop character from input character device.
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 *
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 * @param indev Input character device.
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 *
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 * @return Character read.
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 *
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 */
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wchar_t indev_pop_character(indev_t *indev)
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{
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    if (atomic_get(&haltstate)) {
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        /* If we are here, we are hopefully on the processor that
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         * issued the 'halt' command, so proceed to read the character
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         * directly from input
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         */
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        if (check_poll(indev))
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            return indev->op->poll(indev);
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        /* No other way of interacting with user */
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        interrupts_disable();
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        if (CPU)
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            printf("cpu%u: ", CPU->id);
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        else
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            printf("cpu: ");
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        printf("halted (no polling input)\n");
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        cpu_halt();
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    }
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    waitq_sleep(&indev->wq);
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    ipl_t ipl = interrupts_disable();
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    spinlock_lock(&indev->lock);
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    wchar_t ch = indev->buffer[(indev->index - indev->counter) % INDEV_BUFLEN];
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    indev->counter--;
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    spinlock_unlock(&indev->lock);
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    interrupts_restore(ipl);
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    return ch;
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}
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/** Initialize output character device.
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 *
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 * @param outdev Output character device.
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 * @param op     Implementation of output character device operations.
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 *
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 */
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void outdev_initialize(char *name, outdev_t *outdev,
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    outdev_operations_t *op)
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{
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    outdev->name = name;
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    spinlock_initialize(&outdev->lock, "outdev");
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    outdev->op = op;
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}
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bool check_poll(indev_t *indev)
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{
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    if (indev == NULL)
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        return false;
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    if (indev->op == NULL)
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        return false;
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    return (indev->op->poll != NULL);
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}
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1888 jermar 150 
/** @}
1702 cejka 151 
 */