interrupts during system calls

"It just works."

interrupts during system calls
af7366c9 · rsc · ab08960f · af7366c9
--- a/trap.c
+++ b/trap.c
@@ -20,7 +20,7 @@ tvinit(void)

  for(i = 0; i < 256; i++)
    SETGATE(idt[i], 0, SEG_KCODE<<3, vectors[i], 0);
-  SETGATE(idt[T_SYSCALL], 0, SEG_KCODE<<3, vectors[T_SYSCALL], DPL_USER);
+  SETGATE(idt[T_SYSCALL], 1, SEG_KCODE<<3, vectors[T_SYSCALL], DPL_USER);
  
  initlock(&tickslock, "time");
 }