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| Rev | Author | Line No. | Line |
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| 509 | jermar | 1 | /* |
| 510 | jermar | 2 | * Copyright (C) 2003 Josef Cejka |
| 509 | jermar | 3 | * Copyright (C) 2005 Jakub Jermar |
| 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 <arch/drivers/keyboard.h> |
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| 510 | jermar | 31 | #include <console/chardev.h> |
| 32 | #include <console/console.h> |
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| 509 | jermar | 33 | #include <arch/cp0.h> |
| 34 | #include <putchar.h> |
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| 510 | jermar | 35 | #include <synch/spinlock.h> |
| 36 | #include <synch/waitq.h> |
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| 37 | #include <typedefs.h> |
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| 509 | jermar | 38 | |
| 510 | jermar | 39 | static chardev_t kbrd; |
| 40 | |||
| 41 | static void keyboard_enable(void); |
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| 42 | |||
| 43 | /** Initialize keyboard subsystem. */ |
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| 509 | jermar | 44 | void keyboard_init(void) |
| 45 | { |
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| 46 | cp0_unmask_int(KEYBOARD_IRQ); |
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| 510 | jermar | 47 | chardev_initialize(&kbrd, keyboard_enable); |
| 48 | stdin = &kbrd; |
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| 509 | jermar | 49 | } |
| 50 | |||
| 510 | jermar | 51 | /** Process keyboard interrupt. |
| 52 | * |
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| 53 | * This function is called directly from the interrupt handler. |
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| 54 | * It feeds the keyboard buffer with characters read. When the buffer |
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| 55 | * is full, it simply masks the keyboard interrupt signal. |
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| 56 | */ |
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| 509 | jermar | 57 | void keyboard(void) |
| 58 | { |
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| 510 | jermar | 59 | char ch; |
| 60 | |||
| 61 | spinlock_lock(&kbrd.lock); |
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| 62 | kbrd.counter++; |
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| 63 | if (kbrd.counter == CHARDEV_BUFLEN - 1) { |
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| 64 | /* buffer full => disable keyboard interrupt */ |
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| 65 | cp0_mask_int(KEYBOARD_IRQ); |
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| 66 | } |
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| 67 | |||
| 68 | ch = *((char *) KEYBOARD_ADDRESS); |
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| 69 | putchar(ch); |
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| 70 | kbrd.buffer[kbrd.index++] = ch; |
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| 71 | kbrd.index = kbrd.index % CHARDEV_BUFLEN; /* index modulo size of buffer */ |
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| 72 | waitq_wakeup(&kbrd.wq, WAKEUP_FIRST); |
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| 73 | spinlock_unlock(&kbrd.lock); |
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| 509 | jermar | 74 | } |
| 510 | jermar | 75 | |
| 76 | /* Called from getc(). */ |
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| 77 | void keyboard_enable(void) |
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| 78 | { |
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| 79 | cp0_unmask_int(KEYBOARD_IRQ); |
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| 80 | } |