diff --git a/stand/efi/include/efiprot.h b/stand/efi/include/efiprot.h
--- a/stand/efi/include/efiprot.h
+++ b/stand/efi/include/efiprot.h
@@ -632,4 +632,31 @@
     CHAR8 **SupportedLanguages;
 } EFI_COMPONENT_NAME2;
 
+//
+// RISC-V EFI Boot Protocol
+//
+// https://github.com/riscv-non-isa/riscv-uefi
+//
+
+#define RISCV_EFI_BOOT_PROTOCOL_GUID \
+    { 0xccd15fec, 0x6f73, 0x4eec, {0x83, 0x95, 0x3e, 0x69, 0xe4, 0xb9, 0x40, 0xbf} }
+
+INTERFACE_DECL(_RISCV_EFI_BOOT_PROTOCOL);
+
+#define RISCV_EFI_BOOT_PROTOCOL_REVISION 0x00010000
+#define RISCV_EFI_BOOT_PROTOCOL_LATEST_VERSION \
+        RISCV_EFI_BOOT_PROTOCOL_REVISION
+
+typedef
+EFI_STATUS
+(EFIAPI *EFI_GET_BOOT_HARTID) (
+    IN struct _RISCV_EFI_BOOT_PROTOCOL *This,
+    OUT UINTN                          *BootHartId
+    );
+
+typedef struct _RISCV_EFI_BOOT_PROTOCOL {
+    UINT64                Revision;
+    EFI_GET_BOOT_HARTID   GetBootHartId;
+} RISCV_EFI_BOOT_PROTOCOL;
+
 #endif