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-rw-r--r--sys/x86/include/apicreg.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/sys/x86/include/apicreg.h b/sys/x86/include/apicreg.h
index d610d7f11a1c..1252647fbab3 100644
--- a/sys/x86/include/apicreg.h
+++ b/sys/x86/include/apicreg.h
@@ -296,6 +296,8 @@ typedef struct IOAPIC ioapic_t;
/* constants relating to APIC ID registers */
#define APIC_ID_MASK 0xff000000
#define APIC_ID_SHIFT 24
+#define APIC_EXT_ID_MASK 0x00fe0000
+#define APIC_EXT_ID_SHIFT 17
#define APIC_ID_CLUSTER 0xf0
#define APIC_ID_CLUSTER_ID 0x0f
#define APIC_MAX_CLUSTER 0xe