// Enter scheduler. Must hold only ptable.lock
// and have changed proc->state.
void sched(void)
{
int intena;
//show_callstk ("sched");
if(!holding(&ptable.lock)) {
panic("sched ptable.lock");
}
if(cpu->ncli != 1) {
panic("sched locks");
}
if(proc->state == RUNNING) {
panic("sched running");
}
if(int_enabled ()) {
panic("sched interruptible");
}
intena = cpu->intena;
swtch(&proc->context, cpu->scheduler);
cpu->intena = intena;
}
void keyboard_init(void)
{
if (int_enabled()) int_disable();
cons_printf("Initialize keyboard ............");
x86_ps2_init();
/* Start out with no shift keys enabled. */
s_shiftstate = 0;
/* Buffer is initially empty. */
s_queue_head = s_queue_tail = 0;
/* Install interrupt handler */
irq_install_handler(KEYB_IRQ, &keyboard_int_handler);
irq_enable(KEYB_IRQ);
int_enable();
g_preemption = true;
cons_printf(".... [OK]\n");
}
