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-rw-r--r--src/include/ipxe/acpi.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/include/ipxe/acpi.h b/src/include/ipxe/acpi.h
index e41bd2890..f979ace45 100644
--- a/src/include/ipxe/acpi.h
+++ b/src/include/ipxe/acpi.h
@@ -78,6 +78,9 @@ struct acpi_qword_address_space_resource {
/** A memory address space type */
#define ACPI_ADDRESS_TYPE_MEM 0x00
+/** A bus number address space type */
+#define ACPI_ADDRESS_TYPE_BUS 0x02
+
/** An ACPI resource descriptor */
union acpi_resource {
/** Tag byte */