Implement PIT interrupts

kernel/term/term.c

@@ -8,7 +8,6 @@
 Term TERM;
 
 void term_init(void) {
-  spinlock_init(&TERM.spinlock);
   TERM.ftctx = flanterm_fb_init(
     NULL, NULL,
     BOOT_INFO.fb->address,
@@ -32,9 +31,7 @@ void term_init(void) {
 }
 
 void term_write(const char *s, size_t len) {
-  spinlock_acquire(&TERM.spinlock);
   flanterm_write(TERM.ftctx, s, len);
-  spinlock_release(&TERM.spinlock);
 }
 
 #if PUTCHAR_ == PUTCHAR_FB