| 0,0 → 1,151 |
|---|
| /* |
| * 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. |
| */ |
| |
| /** @addtogroup genericconsole |
| * @{ |
| */ |
| /** @file |
| */ |
| |
| #include <console/chardev.h> |
| #include <synch/waitq.h> |
| #include <synch/spinlock.h> |
| #include <print.h> |
| #include <func.h> |
| #include <arch.h> |
| |
| /** Initialize input character device. |
| * |
| * @param indev Input character device. |
| * @param op Implementation of input character device operations. |
| * |
| */ |
| void indev_initialize(char *name, indev_t *indev, |
| indev_operations_t *op) |
| { |
| indev->name = name; |
| waitq_initialize(&indev->wq); |
| spinlock_initialize(&indev->lock, "indev"); |
| indev->counter = 0; |
| indev->index = 0; |
| indev->op = op; |
| } |
| |
| /** Push character read from input character device. |
| * |
| * @param indev Input character device. |
| * @param ch Character being pushed. |
| * |
| */ |
| void indev_push_character(indev_t *indev, wchar_t ch) |
| { |
| ASSERT(indev); |
| |
| spinlock_lock(&indev->lock); |
| if (indev->counter == INDEV_BUFLEN - 1) { |
| /* Buffer full */ |
| spinlock_unlock(&indev->lock); |
| return; |
| } |
| |
| indev->counter++; |
| indev->buffer[indev->index++] = ch; |
| |
| /* Index modulo size of buffer */ |
| indev->index = indev->index % INDEV_BUFLEN; |
| waitq_wakeup(&indev->wq, WAKEUP_FIRST); |
| spinlock_unlock(&indev->lock); |
| } |
| |
| /** Pop character from input character device. |
| * |
| * @param indev Input character device. |
| * |
| * @return Character read. |
| * |
| */ |
| wchar_t indev_pop_character(indev_t *indev) |
| { |
| if (atomic_get(&haltstate)) { |
| /* If we are here, we are hopefully on the processor that |
| * issued the 'halt' command, so proceed to read the character |
| * directly from input |
| */ |
| if (check_poll(indev)) |
| return indev->op->poll(indev); |
| |
| /* No other way of interacting with user */ |
| interrupts_disable(); |
| |
| if (CPU) |
| printf("cpu%u: ", CPU->id); |
| else |
| printf("cpu: "); |
| |
| printf("halted (no polling input)\n"); |
| cpu_halt(); |
| } |
| |
| waitq_sleep(&indev->wq); |
| ipl_t ipl = interrupts_disable(); |
| spinlock_lock(&indev->lock); |
| wchar_t ch = indev->buffer[(indev->index - indev->counter) % INDEV_BUFLEN]; |
| indev->counter--; |
| spinlock_unlock(&indev->lock); |
| interrupts_restore(ipl); |
| |
| return ch; |
| } |
| |
| /** Initialize output character device. |
| * |
| * @param outdev Output character device. |
| * @param op Implementation of output character device operations. |
| * |
| */ |
| void outdev_initialize(char *name, outdev_t *outdev, |
| outdev_operations_t *op) |
| { |
| outdev->name = name; |
| spinlock_initialize(&outdev->lock, "outdev"); |
| outdev->op = op; |
| } |
| |
| bool check_poll(indev_t *indev) |
| { |
| if (indev == NULL) |
| return false; |
| |
| if (indev->op == NULL) |
| return false; |
| |
| return (indev->op->poll != NULL); |
| } |
| |
| /** @} |
| */ |