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.

makefile

@@ -28,26 +28,26 @@ CPPFLAGS:=$(CPPFLAGS) $(KERNEL_ARCH_CPPFLAGS)
 LDFLAGS:=$(LDFLAGS) $(KERNEL_ARCH_LDFLAGS)
 LIBS:=$(LIBS) $(KERNEL_ARCH_LIBS)
 
-KERNEL_OBJS=           \
-$(KERNEL_ARCH_OBJS)    \
-kernel/utils.o         \
-kernel/serial.o        \
-kernel/interrupts.o    \
-kernel/descriptor_tables.o\
+KERNEL_OBJS=               \
+$(KERNEL_ARCH_OBJS)        \
+kernel/utils.o             \
+kernel/serial.o            \
+kernel/interrupts.o        \
+kernel/descriptor_tables.o \
 kernel/kernel.o        
 
 OBJS=\
 $(KERNEL_OBJS)        
 
 LINK_LIST=\
-$(LDFLAGS)            \
-$(KERNEL_OBJS)        \
-$(LIBS)               \
+$(LDFLAGS)                 \
+$(KERNEL_OBJS)             \
+$(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)