From: Ben Pfaff <blp@cs.stanford.edu>
Date: Tue, 7 Sep 2004 06:22:05 +0000 (+0000)
Subject: Default to INTR_OFF for unregistered interrupts.
X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?p=pintos-anon;a=commitdiff_plain;h=2559f61a41ebfca4f17aae39c89b77a8f1c5c80f

Default to INTR_OFF for unregistered interrupts.
Add assert.
Add comment.
---

diff --git a/src/threads/interrupt.c b/src/threads/interrupt.c
index d248d72..fca145e 100644
--- a/src/threads/interrupt.c
+++ b/src/threads/interrupt.c
@@ -68,6 +68,7 @@ enum intr_level
 intr_enable (void) 
 {
   enum intr_level old_level = intr_get_level ();
+  ASSERT (!intr_context ());
   asm volatile ("sti");
   return old_level;
 }
@@ -93,7 +94,7 @@ intr_init (void)
 
   /* Initialize IDT. */
   for (i = 0; i < INTR_CNT; i++)
-    idt[i] = make_trap_gate (intr_stubs[i], 0);
+    idt[i] = make_intr_gate (intr_stubs[i], 0);
 
   /* Load IDT register. */
   idtr_operand = make_idtr_operand (sizeof idt - 1, idt);
@@ -303,6 +304,10 @@ intr_handler (struct intr_frame *frame)
   bool external;
   intr_handler_func *handler;
 
+  /* External interrupts are special.
+     We only handle one at a time (so interrupts must be off)
+     and they need to be acknowledged on the PIC (see below).
+     An external interrupt handler cannot sleep. */
   external = frame->vec_no >= 0x20 && frame->vec_no < 0x30;
   if (external) 
     {