Populate UEFI entry point.

arch/uefi/entry.c

@@ -0,0 +1,52 @@
+/************************
+ *** Team Kitty, 2019 ***
+ ***       Sync       ***
+ ***********************/
+ 
+/* The entry point of the UEFI app.
+ * When the firmware loads the app,
+ * it calls the efi_main function.
+ * 
+ * When it is called, the processor
+ * is running in 32-bit Protected mode.
+ * It is given a map of memory, and there
+ * are a bunch of Boot Services provided
+ * by the UEFI firmware.
+ *
+ * See uefi/docs for more information.
+ */
+ 
+ //Example stolen from osdev.org/uefi_bare_bones
+ 
+#include <efi.h>
+#include <efilib.h>
+ 
+EFI_STATUS efi_main(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable)
+{
+    EFI_STATUS Status;
+    EFI_INPUT_KEY Key;
+ 
+    /* Store the system table for future use in other functions */
+    ST = SystemTable;
+ 
+    /* Say hi */
+    Status = ST->ConOut->OutputString(ST->ConOut, L"Hello World\n\r");
+    if (EFI_ERROR(Status))
+        return Status;
+ 
+    /* Now wait for a keystroke before continuing, otherwise your
+       message will flash off the screen before you see it.
+ 
+       First, we need to empty the console input buffer to flush
+       out any keystrokes entered before this point */
+    Status = ST->ConIn->Reset(ST->ConIn, FALSE);
+    if (EFI_ERROR(Status))
+        return Status;
+ 
+    /* Now wait until a key becomes available.  This is a simple
+       polling implementation.  You could try and use the WaitForKey
+       event instead if you like */
+    while ((Status = ST->ConIn->ReadKeyStroke(ST->ConIn, &Key)) == EFI_NOT_READY) ;
+ 
+    return Status;
+}