timer interrupts

1 files changed, 6 insertions, 0 deletions

diff --git a/traps.h b/traps.h
index a81903c..4b2d368 100644
--- a/traps.h
+++ b/traps.h
@@ -24,3 +24,9 @@
 // processor defined exceptions or interrupt vectors.
 #define T_SYSCALL   48		// system call
 #define T_DEFAULT   500		// catchall
+
+#define IRQ_OFFSET      32	// IRQ 0 corresponds to int IRQ_OFFSET
+
+#define IRQ_TIMER       18
+#define IRQ_ERROR       19
+#define IRQ_SPURIOUS    31