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-rw-r--r--src/include/ipxe/efi/IndustryStandard/Acpi40.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/include/ipxe/efi/IndustryStandard/Acpi40.h b/src/include/ipxe/efi/IndustryStandard/Acpi40.h
index f6c70d74..97b81703 100644
--- a/src/include/ipxe/efi/IndustryStandard/Acpi40.h
+++ b/src/include/ipxe/efi/IndustryStandard/Acpi40.h
@@ -12,6 +12,11 @@ FILE_LICENCE ( BSD2_PATENT );
#include <ipxe/efi/IndustryStandard/Acpi30.h>
+///
+/// _PSD Revision for ACPI 4.0
+///
+#define EFI_ACPI_4_0_AML_PSD_REVISION 0
+
//
// Ensure proper structure formats
//