Added root Makefile and module Makefile

Makefile

@@ -1,33 +1,67 @@
-OBJECTS = loader.o kmain.o
+# loader and kmain must be the only object files placed in the root directory.
+
+OBJECTS = loader.o kmain.o 
+
+# Flags for linker and compiler. Those options tell the compiler to stay chill
+# and let me handle libraries, linking and other stuff.
 
 CC = gcc
 CCFLAGS = -m32 -nostdlib -nostdinc -fno-builtin -fno-stack-protector \
 		  -nostartfiles -nodefaultlibs -Wall -Wextra -Werror -c
-LDFLAGS = -T link.ld -melf_i386
+LDFLAGS = -T link.ld -m elf_i386
 
 AS = nasm
 ASFLAGS = -f elf32
 
-all: kernel.elf
+# Each module directory starts with the character 'm'. MDIRS will search for such
+# directories and MOBJECTS will collect the module objects to be linked with the
+# root objects (loader and kmain).
+
+MDIRS = $(wildcard m*)
+MOBJECTS = $(wildcard $(MDIRS)/*.o)
+
+.PHONY: all clean mall
+
+# all - Default rule that build the entire project.
+
+all: kernel.elf mall
+
+# mall - Recursively build all modules.
+
+mall:
+	for dir in $(MDIRS); do \
+		$(MAKE) -C $$dir; \
+	done
+
+# kernel.elf - Link all root objects and module objects to create the
+# kernel.elf executable
 
 kernel.elf: $(OBJECTS)
-	ld $(LDFLAGS) $(OBJECTS) -o kernel.elf
+	ld $(LDFLAGS) $(OBJECTS) $(MOBJECTS) -o kernel.elf
+
+# os.iso - Create the OS image and place the kernel fiel in GRUB directory.
 
 os.iso: kernel.elf
 	cp kernel.elf iso/boot/kernel.elf
-	genisoimage -R 					         \
-				-b boot/grub/stage2_eltorito \
-				-no-emul-boot 				 \
-				-boot-load-size 4 			 \
-				-A os 						 \
-				-input-charset utf8 		 \
-				-quiet 						 \
-				-boot-info-table 			 \
-				-o os.iso 					 \
-				iso
+	genisoimage -R                   \
+		-b boot/grub/stage2_eltorito \
+		-no-emul-boot                \
+		-boot-load-size 4            \
+		-A os                        \
+		-input-charset utf8          \
+		-quiet                       \
+		-boot-info-table             \
+		-o os.iso 					 \
+		iso
+
+# run - Run the emulator using the config file.
+
+BOCHS_CONFIG := bochsrc.txt
 
 run: os.iso
-	bochs -f bochsrc.txt -q
+	bochs -f $(BOCHS_CONFIG) -q
+
+# Compile and assemble c and s files.
 
 %.o: %.c
 	$(CC) $(CCFLAGS) $< -o $@
@@ -35,5 +69,13 @@ run: os.iso
 %.o: %.s
 	$(AS) $(ASFLAGS) $< -o $@
 
-clean:
-	rm -rf *.o kernel.elf os.iso bochslog.txt iso/boot/kernel.elf
+# clean, mclean - Clean unuseful files from root directory and from module
+# directories
+
+clean: mclean
+	@$(RM) *.o kernel.elf os.iso bochslog.txt iso/boot/kernel.elf
+
+mclean:
+	for dir in $(MDIRS); do \
+		$(MAKE) -C $$dir distclean; \
+	done

mterminal/Makefile

@@ -0,0 +1,58 @@
+# SRC_DIR - Directory containing source
+# OBJ_DIR - Directory where temporary objects will be created
+# INC_DIR - Directory where header files are declared
+
+SRC_DIR := src
+OBJ_DIR := obj
+INC_DIR := include
+
+# MOBJECT - Module Object
+
+MOBJECT := terminal.o
+
+SOURCES := $(wildcard $(SRC_DIR)/*.c)
+OBJECTS := $(SOURCES:$(SRC_DIR)/%.c=$(OBJ_DIR)/%.o)
+
+# CCFLAGS, LDFLAGS, INCFLAGS - Flags for linker and compiler.
+# HFLAGS - MMD generates makefile dependencies so that whenever a header file
+# is modified the project will be rebuilt if needed.
+
+CC = gcc
+CCFLAGS = -m32 -nostdlib -lgcc -nostdinc -fno-builtin -fno-stack-protector \
+		  -nostartfiles -nodefaultlibs -Wall -Wextra -Werror -c
+HFLAGS = -MMD 
+LDFLAGS = -relocatable -m elf_i386
+INCFLAGS = -I$(INC_DIR)
+
+.PHONY: all clean
+
+# all - Default rule for building the module object.
+
+all: $(MOBJECT)
+
+# MOBJECT - Links all object into one global module object.
+
+$(MOBJECT): $(OBJECTS) 
+	ld $(LDFLAGS) $^ -o $@
+
+# Rule that converts source files into object files.
+
+$(OBJ_DIR)/%.o: $(SRC_DIR)/%.c | $(OBJ_DIR)
+	$(CC) $(CCFLAGS) $(HFLAGS) $(INCFLAGS) $< -o $@
+
+# OBJ_DIR - Creates a temporary folder containing object files.
+
+$(OBJ_DIR):
+	mkdir -p $@
+
+# clean, mclean - deletes object files and the module object if necessary
+
+clean:
+	@$(RM) -rv $(OBJ_DIR)
+
+distclean: clean
+	@$(RM) $(MOBJECT)
+
+# Create d files used for makefile dependencies using o files.
+
+-include $(OBJECTS:.o=.d)