void
game_init(void) {
init_serial();
init_timer();
init_idt();
init_intr();
set_timer_intr_handler(timer_event);
set_keyboard_intr_handler(keyboard_event);
printk("game start!\n");
enable_interrupt();
main_loop();
assert(0); /* main_loop是死循环，永远无法返回这里 */
}
void
game_init(void) {
/* Setting up a 100Hz timer */
init_100hz_timer();
/* Setting up the interrupt descriptor table,
this procedure installs ``actual'' interrupt handlers */
init_idt();
/* Setting up the interrupt controller i8259,
the interrupt code will start at 32,
and i8259 will send end-of-interrupt signal automatically */
init_intr();
/* Setting up the game interrupt handlers.
the start_frame and key_stroke procedures are wrapped by
our interrupt handler to make interrupts transparent.
For implementation, you simply need to know that start_frame
is called for every timer interrupt, and so does key_stroke
for every keyboard interrupt (press or release). */
set_timer_intr_handler(start_frame);
set_keyboard_intr_handler(key_stroke);
/* Calls the game logic.
All game logic related codes are in game.c */
init_game();
/* Just a ``sti'' instruction */
enable_interrupt();
/* The main loop now needs to do nothing but wait for
coming endless interrupts.
All game tasks are done in the interrupt handler. */
while (1) {
idle_cpu();
}
}
