Add nasm support

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>

uefi/Makefile

@@ -6,21 +6,24 @@ endif
 
 # get source files, generate object names
 ifeq ($(SRCS),)
-SRCS = $(wildcard *.c) $(wildcard *.S)
+SRCS = $(wildcard *.c) $(wildcard *.S) $(wildcard *.nasm)
 endif
 TMP = $(SRCS:.c=.o)
-OBJS = $(TMP:.S=.o)
+TMP1 = $(TMP:.S=.o)
+OBJS = $(TMP1:.nasm=.o)
 CFLAGS += -fshort-wchar -fno-strict-aliasing -ffreestanding -fno-stack-protector -fno-stack-check -I. -I./uefi \
   -I/usr/include -I/usr/include/efi -I/usr/include/efi/protocol -I/usr/include/efi/$(ARCH) -D__$(ARCH)__
 ifeq ($(ARCH),x86_64)
 CFLAGS += -DHAVE_USE_MS_ABI -mno-red-zone
 endif
 
-# for libuefi.a
+# for libuefi.
 LIBSRCS = $(filter-out $(wildcard crt_*.c),$(wildcard *.c)) $(wildcard *.S)
 TMP2 = $(LIBSRCS:.c=.o)
 LIBOBJS = $(TMP2:.S=.o)
 
+# NASM can only be nasm :-)
+NASM = nasm
 # detect toolchain
 ifeq ($(wildcard /usr/bin/clang)$(wildcard /usr/local/bin/clang)$(wildcard /usr/lib/llvm/*/bin/clang),)
 USE_GCC = 1
@@ -29,6 +32,7 @@ ifneq ($(USE_GCC),)
 ifeq ($(ARCH),x86_64)
 CFLAGS += -maccumulate-outgoing-args
 endif
+NASMFLAGS += -f elf64
 CFLAGS += -Wno-builtin-declaration-mismatch -fpic -fPIC
 LDFLAGS += -nostdlib -shared -Bsymbolic -Luefi uefi/crt_$(ARCH).o
 LIBS += -o $(TARGET).so -luefi -T uefi/elf_$(ARCH)_efi.lds
@@ -49,6 +53,8 @@ EFIARCH = efi-app-$(ARCH)
 endif
 AR ?= ar
 else
+# clang toolchian uses COFF64
+NASMFLAGS += -f win64
 CFLAGS += --target=$(ARCH)-pc-win32-coff -Wno-builtin-requires-header -Wno-incompatible-library-redeclaration -Wno-long-long
 LDFLAGS += -subsystem:efi_application -nodefaultlib -dll -entry:uefi_init uefi/*.o
 LIBS = -out:$(TARGET)
@@ -95,6 +101,9 @@ $(TARGET).so: $(OBJS)
 %.o: %.S
 	$(CC) $(CFLAGS) -c $< -o $@
 
+%.o: %.nasm
+	$(NASM) $(NASMFLAGS) $< -o $@
+
 build:
 	@mkdir ../build ../build/uefi 2>/dev/null || true
 	@cp crt_$(ARCH).o ../build/uefi/crt0.o