36,41 → 36,30 |
#include <synch/waitq.h> |
#include <typedefs.h> |
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static void keyboard_enable(void); |
static void keyboard_disable(void); |
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static chardev_t kbrd; |
static chardev_operations_t ops = { |
.resume = keyboard_enable, |
.suspend = keyboard_disable |
}; |
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static void keyboard_enable(void); |
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/** Initialize keyboard subsystem. */ |
void keyboard_init(void) |
{ |
cp0_unmask_int(KEYBOARD_IRQ); |
chardev_initialize(&kbrd, keyboard_enable); |
chardev_initialize(&kbrd, &ops); |
stdin = &kbrd; |
} |
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/** 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. |
*/ |
/** Process keyboard interrupt. */ |
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); |
chardev_push_character(&kbrd, ch); |
} |
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/* Called from getc(). */ |
78,3 → 67,9 |
{ |
cp0_unmask_int(KEYBOARD_IRQ); |
} |
|
/* Called from getc(). */ |
void keyboard_disable(void) |
{ |
cp0_mask_int(KEYBOARD_IRQ); |
} |