Modify existing Makefile to allow compilation of UEFI app.

Added targets for the main files - BOOTX64.EFI, data.c and entry.c
Also minor formatting changes, but whatever.

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;
+}

iso/boot/grub/grub.cfg

@@ -1,7 +0,0 @@
-set timeout=10
-set default=0
-
-menuentry "ProjectRED" {
-	multiboot /boot/red.kernel
-	boot
-}

iso/boot/grub/menu.lst

@@ -1,5 +0,0 @@
-defualt=0
-timeout=0
-
-title ProjectRED
-kernel /boot/kernel.elf

makefile

@@ -47,7 +47,7 @@ $(LIBS)               \
 .PHONY: all clean install install-headers install-kernel
 .SUFFIXES: .o .c .s
 
-all: red.kernel
+all: BOOTX64.EFI
 
 red.kernel: $(OBJS) $(ARCHDIR)/linker.ld
 	$(CC) -T $(ARCHDIR)/linker.ld -o $@ $(CFLAGS) $(LINK_LIST)
@@ -88,4 +88,13 @@ gen-iso:
 		-o red.iso                    \
 		iso
 	
+BOOTX64.EFI: arch/uefi/entry.o efi/lib/data.o
+	$(EFI-CC) -nostdlib -Wl,-dll -shared -Wl,--subsystem,10 -e efi_main -o BOOTX64.EFI arch/uefi/entry.o data.o -lgcc
+
+arch/uefi/entry.o:
+	$(EFI-CC) -ffreestanding -Iinclude/efi/ -Iinclude/efi/x86_64 -Iinclude/efi/protocol -c -o arch/uefi/entry.o arch/uefi/entry.c
+	
+efi/lib/data.o:
+	$(EFI-CC) -ffreestanding -Iinclude/efi/ -Iinclude/efi/x86_64 -Iinclude/efi/protocol -c -o data.o efi/lib/data.c
+
 -include $(OBJS:.o=.d)