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34 | #include <putchar.h> |
34 | #include <putchar.h> |
35 | #include <synch/spinlock.h> |
35 | #include <synch/spinlock.h> |
36 | #include <synch/waitq.h> |
36 | #include <synch/waitq.h> |
37 | #include <typedefs.h> |
37 | #include <typedefs.h> |
38 | 38 | ||
39 | static chardev_t kbrd; |
- | |
40 | - | ||
41 | static void keyboard_enable(void); |
39 | static void keyboard_enable(void); |
- | 40 | static void keyboard_disable(void); |
|
- | 41 | ||
- | 42 | static chardev_t kbrd; |
|
- | 43 | static chardev_operations_t ops = { |
|
- | 44 | .resume = keyboard_enable, |
|
- | 45 | .suspend = keyboard_disable |
|
- | 46 | }; |
|
42 | 47 | ||
43 | /** Initialize keyboard subsystem. */ |
48 | /** Initialize keyboard subsystem. */ |
44 | void keyboard_init(void) |
49 | void keyboard_init(void) |
45 | { |
50 | { |
46 | cp0_unmask_int(KEYBOARD_IRQ); |
51 | cp0_unmask_int(KEYBOARD_IRQ); |
47 | chardev_initialize(&kbrd, keyboard_enable); |
52 | chardev_initialize(&kbrd, &ops); |
48 | stdin = &kbrd; |
53 | stdin = &kbrd; |
49 | } |
54 | } |
50 | 55 | ||
51 | /** Process keyboard interrupt. |
56 | /** Process keyboard interrupt. */ |
52 | * |
- | |
53 | * This function is called directly from the interrupt handler. |
- | |
54 | * It feeds the keyboard buffer with characters read. When the buffer |
- | |
55 | * is full, it simply masks the keyboard interrupt signal. |
- | |
56 | */ |
- | |
57 | void keyboard(void) |
57 | void keyboard(void) |
58 | { |
58 | { |
59 | char ch; |
59 | char ch; |
60 | 60 | ||
61 | spinlock_lock(&kbrd.lock); |
- | |
62 | kbrd.counter++; |
- | |
63 | if (kbrd.counter == CHARDEV_BUFLEN - 1) { |
- | |
64 | /* buffer full => disable keyboard interrupt */ |
- | |
65 | cp0_mask_int(KEYBOARD_IRQ); |
- | |
66 | } |
- | |
67 | - | ||
68 | ch = *((char *) KEYBOARD_ADDRESS); |
61 | ch = *((char *) KEYBOARD_ADDRESS); |
69 | putchar(ch); |
- | |
70 | kbrd.buffer[kbrd.index++] = ch; |
- | |
71 | kbrd.index = kbrd.index % CHARDEV_BUFLEN; /* index modulo size of buffer */ |
- | |
72 | waitq_wakeup(&kbrd.wq, WAKEUP_FIRST); |
- | |
73 | spinlock_unlock(&kbrd.lock); |
62 | chardev_push_character(&kbrd, ch); |
74 | } |
63 | } |
75 | 64 | ||
76 | /* Called from getc(). */ |
65 | /* Called from getc(). */ |
77 | void keyboard_enable(void) |
66 | void keyboard_enable(void) |
78 | { |
67 | { |
79 | cp0_unmask_int(KEYBOARD_IRQ); |
68 | cp0_unmask_int(KEYBOARD_IRQ); |
80 | } |
69 | } |
- | 70 | ||
- | 71 | /* Called from getc(). */ |
|
- | 72 | void keyboard_disable(void) |
|
- | 73 | { |
|
- | 74 | cp0_mask_int(KEYBOARD_IRQ); |
|
- | 75 | } |