X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fthreads%2Finterrupt.c;fp=src%2Fthreads%2Finterrupt.c;h=82b7db7d724bed32a60fe5d9c1c004192d2049fd;hb=615bf3b3d2a8573ed6fb9ddc0055745e163ac999;hp=3e522280a5b76ea5baae93e5daf8ecd4746b0028;hpb=5780c9f434cca090f88463b7f0199d49b4ded288;p=pintos-anon

diff --git a/src/threads/interrupt.c b/src/threads/interrupt.c
index 3e52228..82b7db7 100644
--- a/src/threads/interrupt.c
+++ b/src/threads/interrupt.c
@@ -137,9 +137,37 @@ intr_init (void)
   intr_names[19] = "#XF SIMD Floating-Point Exception";
 }
 
-/* Registers interrupt VEC_NO to invoke HANDLER, which is named
-   NAME for debugging purposes.  The interrupt handler will be
-   invoked with interrupt status set to LEVEL.
+/* Registers interrupt VEC_NO to invoke HANDLER with descriptor
+   privilege level DPL.  Names the interrupt NAME for debugging
+   purposes.  The interrupt handler will be invoked with
+   interrupt status set to LEVEL. */
+static void
+register_handler (uint8_t vec_no, int dpl, enum intr_level level,
+                  intr_handler_func *handler, const char *name)
+{
+  ASSERT (intr_handlers[vec_no] == NULL);
+  if (level == INTR_ON)
+    idt[vec_no] = make_trap_gate (intr_stubs[vec_no], dpl);
+  else
+    idt[vec_no] = make_intr_gate (intr_stubs[vec_no], dpl);
+  intr_handlers[vec_no] = handler;
+  intr_names[vec_no] = name;
+}
+
+/* Registers external interrupt VEC_NO to invoke HANDLER, which
+   is named NAME for debugging purposes.  The handler will
+   execute with interrupts disabled. */
+void
+intr_register_ext (uint8_t vec_no, intr_handler_func *handler,
+                   const char *name) 
+{
+  ASSERT (vec_no >= 0x20 && vec_no <= 0x2f);
+  register_handler (vec_no, 0, INTR_OFF, handler, name);
+}
+
+/* Registers internal interrupt VEC_NO to invoke HANDLER, which
+   is named NAME for debugging purposes.  The interrupt handler
+   will be invoked with interrupt status LEVEL.
 
    The handler will have descriptor privilege level DPL, meaning
    that it can be invoked intentionally when the processor is in
@@ -149,27 +177,11 @@ intr_init (void)
    still cause interrupts with DPL==0 to be invoked.  See
    [IA32-v3] sections 4.5 and 4.8.1.1 for further discussion. */
 void
-intr_register (uint8_t vec_no, int dpl, enum intr_level level,
-               intr_handler_func *handler,
-               const char *name) 
+intr_register_int (uint8_t vec_no, int dpl, enum intr_level level,
+                   intr_handler_func *handler, const char *name)
 {
-  /* Make sure this handler isn't already registered to someone
-     else. */
-  ASSERT (intr_handlers[vec_no] == NULL);
-
-  /* Interrupts generated by external hardware (0x20 <= VEC_NO <=
-     0x2f) should specify INTR_OFF for LEVEL.  Otherwise a timer
-     interrupt could cause a task switch during interrupt
-     handling.  Most other interrupts can and should be handled
-     with interrupts enabled. */
-  ASSERT (vec_no < 0x20 || vec_no > 0x2f || level == INTR_OFF);
-
-  if (level == INTR_ON)
-    idt[vec_no] = make_trap_gate (intr_stubs[vec_no], dpl);
-  else
-    idt[vec_no] = make_intr_gate (intr_stubs[vec_no], dpl);
-  intr_handlers[vec_no] = handler;
-  intr_names[vec_no] = name;
+  ASSERT (vec_no < 0x20 || vec_no > 0x2f);
+  register_handler (vec_no, dpl, level, handler, name);
 }
 
 /* Returns true during processing of an external interrupt