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-rw-r--r--MdePkg/Include/IndustryStandard/pci22.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/MdePkg/Include/IndustryStandard/pci22.h b/MdePkg/Include/IndustryStandard/pci22.h
index f150fbc1b0..581744ff55 100644
--- a/MdePkg/Include/IndustryStandard/pci22.h
+++ b/MdePkg/Include/IndustryStandard/pci22.h
@@ -319,6 +319,11 @@ typedef struct {
#define PCI_BRIDGE_SECONDARY_BUS_REGISTER_OFFSET 0x19
#define PCI_BRIDGE_SUBORDINATE_BUS_REGISTER_OFFSET 0x1a
+//
+// Interrupt Line "Unknown" or "No connection" value defined for x86 based system
+//
+#define PCI_INT_LINE_UNKNOWN 0xFF
+
typedef union {
struct {
UINT32 Reg : 8;