diff --git a/include/asm-x86/e820.h b/include/asm-x86/e820.h
index 3e214f3..f96f185 100644
--- a/include/asm-x86/e820.h
+++ b/include/asm-x86/e820.h
@@ -22,6 +22,9 @@
 };
 #endif /* __ASSEMBLY__ */
 
+#define ISA_START_ADDRESS	0xa0000
+#define ISA_END_ADDRESS		0x100000
+
 #ifdef __KERNEL__
 #ifdef CONFIG_X86_32
 # include "e820_32.h"