Add support for NASM assembler

kernel/Makefile

@@ -19,7 +19,7 @@ TARGET := kernel
 CFILES    := $(shell find src -path src/arch -prune -o -type f -name '*.c' -print)
 ARCHFILES := $(ARCHFILES) $(shell find src/arch/$(ARCH) -type f -name '*.c' -print)
 HFILES    := $(shell find src -type f -name '*.h')
-OBJ       := $(patsubst src/%.c,obj/$(ARCH)/%.o,$(CFILES) $(ARCHFILES))
+OBJ       := $(patsubst src/%,obj/$(ARCH)/%.o,$(CFILES) $(ARCHFILES))
 
 .PHONY: all clean obj $(ARCHES)
 
@@ -32,9 +32,9 @@ $(ARCHES):
 bin/$(TARGET)-$(ARCH): $(OBJ)
 	@mkdir -p $(@D)
 	@echo Linking $@
-	@$(LD) $(LDFLAGS) $(OBJ) -o $@
+	$(LD) $(LDFLAGS) $(OBJ) -o $@
 
-obj/$(ARCH)/%.o: src/%.c $(HFILES)
+obj/$(ARCH)/%.c.o: src/%.c $(HFILES)
 	@mkdir -p $(@D)
 	@echo $(CC) $<
 	@$(CC) $(CFLAGS) -c $< -o $@

kernel/make/i386/make.config

@@ -1 +1,3 @@
 -include make/x86/make.config
+
+NASM := nasm -felf32

kernel/make/x86/make.config

@@ -1,2 +1,9 @@
-ARCHFILES   := $(shell find src/arch/x86 -type f -name '*.c' -print)
-ARCH_CFLAGS := -masm=intel
+ARCHFILES   := $(shell find src/arch/x86 -type f -name '*.c' -print) \
+				$(shell find src/arch/x86 -type f -name '*.nasm' -print) \
+				$(shell find src/arch/$(ARCH) -type f -name '*.nasm' -print)
+ARCH_CFLAGS := -masm=intel
+
+obj/$(ARCH)/%.nasm.o: src/%.nasm
+	@mkdir -p $(@D)
+	@echo nasm $<
+	@$(NASM) $(NASMFLAGS) $< -o $@

kernel/make/x86_64/make.config

@@ -1,3 +1,4 @@
 -include make/x86/make.config
 
+NASM            := nasm -felf64
 ARCH_CFLAGS 	:= $(ARCH_CFLAGS) -mcmodel=kernel