[BOOT:LIB] Implement BlpFwInitialize()

BOOT/ENVIRON/LIB/EFI/efifw.c

@@ -0,0 +1,64 @@
+/*++
+
+Copyright (c) 2024, Quinn Stephens.
+Provided under the BSD 3-Clause license.
+
+Module Name:
+
+   efifw.c
+
+Abstract:
+
+   Provides EFI firmware utilities.
+
+--*/
+
+#include "bootlib.h"
+#include "bootmgr.h"
+
+EFI_SYSTEM_TABLE *EfiST;
+EFI_BOOT_SERVICES *EfiBS;
+EFI_RUNTIME_SERVICES *EfiRT;
+SIMPLE_TEXT_OUTPUT_INTERFACE *EfiConOut;
+SIMPLE_INPUT_INTERFACE *EfiConIn;
+
+NTSTATUS
+BlpFwInitialize (
+    IN ULONG Stage,
+    IN PBOOT_FIRMWARE_DATA FirmwareData
+    )
+
+/*++
+
+Routine Description:
+
+    Internal routine to initialize the boot library.
+
+Arguments:
+
+    Stage - 0 or 1.
+
+    FirmwareData - firmware data structure to use for initialization.
+
+Return Value:
+
+    STATUS_SUCCESS if successful,
+    STATUS_INVALID_PARAMETER if FirmwareData is invalid.
+
+--*/
+
+{
+    if (FirmwareData == NULL || FirmwareData->Version == 0) {
+        return STATUS_INVALID_PARAMETER;
+    }
+
+    if (Stage == 0) {
+        EfiST = FirmwareData->SystemTable;
+        EfiBS = EfiST->BootServices;
+        EfiRT = EfiST->RuntimeServices;
+        EfiConOut = EfiST->ConOut;
+        EfiConIn = EfiST->ConIn;
+    }
+
+    return STATUS_SUCCESS;
+}