Allow modules to read boot loader configuration

sdk/xtdk/bltypes.h

@@ -67,6 +67,7 @@ typedef EFI_STATUS (*PBL_BOOTPROTO_BOOT_SYSTEM)(IN PXTBL_BOOT_PARAMETERS Paramet
 typedef EFI_STATUS (*PBL_CLOSE_VOLUME)(IN PEFI_HANDLE VolumeHandle);
 typedef VOID (*PBL_CLEAR_CONSOLE_LINE)(IN ULONGLONG LineNo);
 typedef EFI_STATUS (*PBL_CLOSE_XT_PROTOCOL)(IN PEFI_HANDLE Handle, IN PEFI_GUID ProtocolGuid);
+typedef PWCHAR (*PBL_CONFIG_GET_VALUE)(IN CONST PWCHAR ConfigName);
 typedef VOID (*PBL_CONSOLE_CLEAR_SCREEN)();
 typedef VOID (*PBL_CONSOLE_DISABLE_CURSOR)();
 typedef VOID (*PBL_CONSOLE_ENABLE_CURSOR)();
@@ -226,6 +227,10 @@ typedef struct _XTBL_LOADER_PROTOCOL
         PBL_REGISTER_BOOT_PROTOCOL RegisterProtocol;
     } Boot;
     struct
+    {
+        PBL_CONFIG_GET_VALUE GetValue;
+    } Config;
+    struct
     {
         PBL_CLEAR_CONSOLE_LINE ClearLine;
         PBL_CONSOLE_CLEAR_SCREEN ClearScreen;

sdk/xtdk/xtblapi.h

@@ -43,6 +43,7 @@
 
 /* Architecture specific XT kernel routines */
 #include ARCH_HEADER(arfuncs.h)
+#include ARCH_HEADER(hlfuncs.h)
 
 /* Boot Manager specific structures */
 #include <bltypes.h>

xtldr/protocol.c

@@ -560,6 +560,7 @@ BlpInstallXtLoaderProtocol()
     BlpLdrProtocol.Boot.InvokeProtocol = BlInvokeBootProtocol;
     BlpLdrProtocol.Boot.RegisterMenu = BlRegisterBootMenu;
     BlpLdrProtocol.Boot.RegisterProtocol = BlRegisterBootProtocol;
+    BlpLdrProtocol.Config.GetValue = BlGetConfigValue;
     BlpLdrProtocol.Console.ClearLine = BlClearConsoleLine;
     BlpLdrProtocol.Console.ClearScreen = BlClearConsoleScreen;
     BlpLdrProtocol.Console.DisableCursor = BlDisableConsoleCursor;