Rewrite core of the XTLDR boot loader

Reviewed-on: #7
Reviewed-by: Piotr Likoski <likoski@noreply.codingworkshop.git>
Co-authored-by: Rafal Kupiec <belliash@codingworkshop.eu.org>
Co-committed-by: Rafal Kupiec <belliash@codingworkshop.eu.org>

xtldr/modules/dummy/dummy.c

@@ -0,0 +1,69 @@
+/**
+ * PROJECT:         ExectOS
+ * COPYRIGHT:       See COPYING.md in the top level directory
+ * FILE:            xtldr/modules/dummy/dummy.c
+ * DESCRIPTION:     XTLDR Dummy Module
+ * DEVELOPERS:      Rafal Kupiec <belliash@codingworkshop.eu.org>
+ */
+
+#include <dummy.h>
+
+
+/* Dummy module information */
+XTBL_MODINFO = L"XTLDR Dummy Module";
+
+/**
+ * Stub boot routine.
+ *
+ * @param Parameters
+ *        Supplies all parameters associated with the chosen boot menu entry.
+ *
+ * @return This routine returns a status code.
+ *
+ * @since XT 1.0
+ */
+XTCDECL
+EFI_STATUS
+BlBootDummyOS(IN PXTBL_BOOT_PARAMETERS Parameters)
+{
+    return STATUS_EFI_SUCCESS;
+}
+
+/**
+ * This routine is the entry point of the XT EFI boot loader module.
+ *
+ * @param ImageHandle
+ *        Firmware-allocated handle that identifies the image.
+ *
+ * @param SystemTable
+ *        Provides the EFI system table.
+ *
+ * @return This routine returns a status code.
+ *
+ * @since XT 1.0
+ */
+XTCDECL
+EFI_STATUS
+XtLdrModuleMain(IN EFI_HANDLE ImageHandle,
+                IN PEFI_SYSTEM_TABLE SystemTable)
+{
+    EFI_GUID DummyGuid = XT_XTOS_BOOT_PROTOCOL_GUID;
+    EFI_STATUS Status;
+
+    /* Open the XTLDR protocol */
+    Status = BlGetXtLdrProtocol(SystemTable, ImageHandle, &XtLdrProto);
+    if(Status != STATUS_EFI_SUCCESS)
+    {
+        /* Failed to open the protocol, return error */
+        return STATUS_EFI_PROTOCOL_ERROR;
+    }
+
+    /* Set boot protocol routines */
+    BlpDummyProtocol.BootSystem = BlBootDummyOS;
+
+    /* Register XTOS boot protocol */
+    XtLdrProto->Boot.RegisterProtocol(L"XTOS", &DummyGuid);
+
+    /* Register DUMMY protocol as XTOS boot protocol */
+    return XtLdrProto->Protocol.Install(&BlpDummyProtocol, &DummyGuid);
+}