give each cpu its own clock, so that preemption works on cpu 1

b41b38d0 · rtm · b548df15 · b41b38d0 · b41b38d0
--- a/main.c
+++ b/main.c
@@ -28,6 +28,8 @@ main()
    acquire_spinlock(&kernel_lock);
    idtinit(); // CPU's idt
    lapic_init(cpu());
+    lapic_timerinit();
+    lapic_enableintr();
    scheduler();
  }
  acpu = 1;

--- a/usertests.c
+++ b/usertests.c
@@ -93,8 +93,8 @@ preempt()
 main()
 {
  puts("usertests starting\n");
-  pipe1();
-  //preempt();
+  //pipe1();
+  preempt();

  while(1)
    ;