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