[BOOT] Execution contexts and more refactoring

BOOT/ENVIRON/LIB/EFI/efifw.c

@@ -13,9 +13,12 @@ Abstract:
 
 --*/
 
+#include <ntrtl.h>
 #include "bootlib.h"
 #include "efi.h"
 
+BOOT_FIRMWARE_DATA EfiFirmwareData;
+PBOOT_FIRMWARE_DATA EfiFirmwareParameters;
 EFI_SYSTEM_TABLE *EfiST;
 EFI_BOOT_SERVICES *EfiBS;
 EFI_RUNTIME_SERVICES *EfiRT;
@@ -36,7 +39,10 @@ Routine Description:
 
 Arguments:
 
-    Stage - 0 or 1.
+    Stage - Which stage of initialization to perform.
+
+        Stage 0: Initialize global firmware-related data and pointers.
+            Once this stage is complete, ConsolePrint() and ConsolePrintf() can be used.
 
     FirmwareData - Pointer to BOOT_FIRMWARE_DATA.
 
@@ -53,6 +59,9 @@ Return Value:
     }
 
     if (Stage == 0) {
+        RtlCopyMemory(&EfiFirmwareData, FirmwareData, sizeof(BOOT_FIRMWARE_DATA));
+        EfiFirmwareParameters = &EfiFirmwareData;
+
         EfiST = FirmwareData->SystemTable;
         EfiBS = EfiST->BootServices;
         EfiRT = EfiST->RuntimeServices;
@@ -60,5 +69,9 @@ Return Value:
         EfiConIn = EfiST->ConIn;
     }
 
+    //
+    // TODO: Implement stage 1 initialization.
+    //
+
     return STATUS_SUCCESS;
 }