| 0,0 → 1,80 |
|---|
| /* |
| * Copyright (C) 2003 Josef Cejka |
| * 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 <arch/drivers/keyboard.h> |
| #include <console/chardev.h> |
| #include <console/console.h> |
| #include <arch/cp0.h> |
| #include <putchar.h> |
| #include <synch/spinlock.h> |
| #include <synch/waitq.h> |
| #include <typedefs.h> |
| |
| static chardev_t kbrd; |
| |
| static void keyboard_enable(void); |
| |
| /** Initialize keyboard subsystem. */ |
| void keyboard_init(void) |
| { |
| cp0_unmask_int(KEYBOARD_IRQ); |
| chardev_initialize(&kbrd, keyboard_enable); |
| stdin = &kbrd; |
| } |
| |
| /** Process keyboard interrupt. |
| * |
| * This function is called directly from the interrupt handler. |
| * It feeds the keyboard buffer with characters read. When the buffer |
| * is full, it simply masks the keyboard interrupt signal. |
| */ |
| void keyboard(void) |
| { |
| char ch; |
| |
| spinlock_lock(&kbrd.lock); |
| kbrd.counter++; |
| if (kbrd.counter == CHARDEV_BUFLEN - 1) { |
| /* buffer full => disable keyboard interrupt */ |
| cp0_mask_int(KEYBOARD_IRQ); |
| } |
| |
| ch = *((char *) KEYBOARD_ADDRESS); |
| putchar(ch); |
| kbrd.buffer[kbrd.index++] = ch; |
| kbrd.index = kbrd.index % CHARDEV_BUFLEN; /* index modulo size of buffer */ |
| waitq_wakeup(&kbrd.wq, WAKEUP_FIRST); |
| spinlock_unlock(&kbrd.lock); |
| } |
| |
| /* Called from getc(). */ |
| void keyboard_enable(void) |
| { |
| cp0_unmask_int(KEYBOARD_IRQ); |
| } |