[BOOT] Add boot manager headers

BOOT/ENVIRON/INC/bootmgr.h

@@ -0,0 +1,34 @@
+/*++
+
+Copyright (c) 2024, Quinn Stephens.
+Provided under the BSD 3-Clause license.
+
+Module Name:
+
+   bootmgr.h
+
+Abstract:
+
+   Boot manager definitions.
+
+--*/
+
+#ifndef _BOOTMGR_H
+#define _BOOTMGR_H
+
+#include <nt.h>
+
+#define BOOT_APPLICATION_PARAMETERS_SIGNATURE 0x50504120544f4f42 /* "BOOT APP" */
+#define BOOT_APPLICATION_PARAMETERS_VERSION   2
+
+typedef struct {
+    ULONGLONG Signature;
+    ULONG Version;
+} BOOT_APPLICATION_PARAMETERS, *PBOOT_APPLICATION_PARAMETERS;
+
+NTSTATUS
+BmMain (
+    IN PBOOT_APPLICATION_PARAMETERS Parameters
+    );
+
+#endif

BOOT/ENVIRON/INC/efilib.h

@@ -0,0 +1,34 @@
+/*++
+
+Copyright (c) 2024, Quinn Stephens.
+Provided under the BSD 3-Clause license.
+
+Module Name:
+
+   efilib.h
+
+Abstract:
+
+    Boot manager EFI library definitions.
+
+--*/
+
+#ifndef _EFILIB_H
+#define _EFILIB_H
+
+#include <nt.h>
+#include "bootmgr.h"
+#include "efi.h"
+
+PBOOT_APPLICATION_PARAMETERS
+EfiInitCreateInputParameters (
+    IN EFI_HANDLE ImageHandle,
+    IN EFI_SYSTEM_TABLE *SystemTable
+    );
+
+EFI_STATUS
+EfiGetEfiStatusCode (
+    IN NTSTATUS Status
+    );
+
+#endif