Makefile

ON_FPGA :=y

CROSS_COMPILE ?= mipsel-linux-gnu-

# eliminate default suffix rules
.SUFFIXES: .c .S .h

# define compiler and flags
HOSTCC		:= gcc
HOSTCFLAGS	:= -g -Wall -O2

GDB		:= $(CROSS_COMPILE)gdb
CC      := $(CROSS_COMPILE)gcc
LD      := $(CROSS_COMPILE)ld
AS      := $(CROSS_COMPILE)as -EL -g -mips32 -msoft-float
AR      := $(CROSS_COMPILE)ar
OBJCOPY := $(CROSS_COMPILE)objcopy
OBJDUMP := $(CROSS_COMPILE)objdump

CFLAGS	:= -msoft-float -ffreestanding -fno-builtin -nostdlib -nostdinc -g -mno-abicalls -fno-pic -EL -G0 -Wall -O0
LDFLAGS	:= -EL -nostdlib -n -G 0 -static
LDFLAGS_SCRIPT := $(LDFLAGS) -T tools/kernel.ld

COPY	:= cp
MKDIR   := mkdir -p
MV		:= mv
RM		:= rm -f
AWK		:= awk
SED		:= sed
SH		:= sh
TR		:= tr
TOUCH	:= touch -c

TAR		:= tar
ZIP		:= gzip

OBJDIR	:= obj
BINDIR	:= bin
SRCDIR  := kern
DEPDIR  := dep


MODULES   := init libs debug driver trap mm sync process schedule syscall fs fs/vfs fs/sfs fs/devs
SRC_DIR   := $(addprefix $(SRCDIR)/,$(MODULES))
BUILD_DIR := $(addprefix $(OBJDIR)/,$(MODULES))
DEP_DIR   := $(addprefix $(DEPDIR)/,$(MODULES))
VPATH     += $(SRC_DIR)

SRC       := $(foreach sdir,$(SRC_DIR),$(wildcard $(sdir)/*.c))
OBJ       := $(patsubst $(SRCDIR)/%.c, $(OBJDIR)/%.o, $(SRC))
ASMSRC    := $(foreach sdir,$(SRC_DIR),$(wildcard $(sdir)/*.S))
OBJ       += $(patsubst $(SRCDIR)/%.S, $(OBJDIR)/%.o, $(ASMSRC))
INCLUDES  := $(addprefix -I,$(SRC_DIR))
INCLUDES  += -I$(SRCDIR)/include

# reserve 2MB for user app
USER_APPLIST     := cat sh ls forktest yield faultreadkernel faultread pgdir sleep
INITRD_BLOCK_CNT := 2000 

ifeq  ($(ON_FPGA), y)
FPGA_LD_FLAGS += -S
MACH_DEF := -DMACH_FPGA
else
MACH_DEF := -DMACH_QEMU
endif

USER_SRCDIR := user
USER_OBJDIR := $(OBJDIR)/$(USER_SRCDIR)
USER_LIB_OBJDIR := $(USER_OBJDIR)/libs
USER_INCLUDE := -I$(USER_SRCDIR)/libs

USER_APP_BINS:= $(addprefix $(USER_OBJDIR)/, $(USER_APPLIST))

USER_LIB_SRCDIR := $(USER_SRCDIR)/libs
USER_LIB_SRC := $(foreach sdir,$(USER_LIB_SRCDIR),$(wildcard $(sdir)/*.c))
USER_LIB_OBJ := $(patsubst $(USER_LIB_SRCDIR)/%.c, $(USER_LIB_OBJDIR)/%.o, $(USER_LIB_SRC))
USER_LIB_OBJ += $(USER_LIB_OBJDIR)/initcode.o
USER_LIB    := $(USER_OBJDIR)/libuser.a

BUILD_DIR   += $(USER_LIB_OBJDIR)
BUILD_DIR   += $(USER_OBJDIR)


DEPENDS := $(patsubst $(SRCDIR)/%.c, $(DEPDIR)/%.d, $(SRC))


CONFIG_FILE := .config_$(ON_FPGA)_$(EN_INT)_$(EN_TLB)

.PHONY: all checkdirs clean qemu

all: checkdirs boot/loader.bin obj/ucore-kernel-initrd

$(shell mkdir -p $(DEP_DIR))

$(CONFIG_FILE):
	@rm -f .config_*
	touch $@

qemu: obj/ucore-kernel-initrd
	qemu-system-mipsel -M mipssim -m 32M -nographic -kernel $< -monitor none -serial stdio

obj/ucore-kernel:   $(OBJ) tools/kernel.ld
	@echo LINK $@
	$(LD) $(LDFLAGS_SCRIPT) $(OBJ) -o $@

obj/ucore-kernel-piggy: $(BUILD_DIR)  $(OBJ) $(USER_APP_BINS) tools/kernel.ld
	@echo LINK $@
	$(LD) $(LDFLAGS_SCRIPT) $(OBJ) \
					$(addsuffix .piggy.o, $(USER_APP_BINS)) -o $@

$(DEPDIR)/%.d: $(SRCDIR)/%.c $(CONFIG_FILE)
	@echo DEP $<
	@set -e; rm -f $@; \
		$(CC) -MM -MT "$(OBJDIR)/$*.o $@" $(CFLAGS) $(INCLUDES) $< > $@; 

$(OBJDIR)/%.o: $(SRCDIR)/%.c $(CONFIG_FILE)
	$(CC) -c -mips1 $(INCLUDES) $(CFLAGS) $(MACH_DEF) $<  -o $@

$(OBJDIR)/%.o: $(SRCDIR)/%.S $(CONFIG_FILE)
	$(CC) -c -mips32 -D__ASSEMBLY__ $(MACH_DEF) $(INCLUDES) $(CFLAGS) $< -o $@

checkdirs: $(BUILD_DIR) $(DEP_DIR)

$(BUILD_DIR):
	@mkdir -p $@

$(DEP_DIR):
	@mkdir -p $@

clean:
	-rm -rf $(BUILD_DIR)
	-rm -rf $(DEPDIR)
	-rm -rf boot/loader.o boot/loader boot/loader.bin


ifneq ($(MAKECMDGOALS),clean)
-include $(DEPENDS)
endif

#user lib
$(USER_LIB): $(BUILD_DIR) $(USER_LIB_OBJ)
	@echo "Building USERLIB"
	$(AR) rcs $@ $(USER_LIB_OBJ)

#user applications
define make-user-app
$1: $(BUILD_DIR) $(addsuffix .o,$1) $(USER_LIB)
	@echo LINK $$@
	$(LD) $(FPGA_LD_FLAGS) -T $(USER_LIB_SRCDIR)/user.ld  $(addsuffix .o,$1) $(USER_LIB) -o $$@
	$(SED) 's/$$$$FILE/$(notdir $1)/g' tools/piggy.S.in > $(USER_OBJDIR)/piggy.$(notdir $1).S
	$(AS) $(USER_OBJDIR)/piggy.$(notdir $1).S -o $$@.piggy.o
endef

$(foreach bdir,$(USER_APP_BINS),$(eval $(call make-user-app,$(bdir))))

$(USER_OBJDIR)/%.o: $(USER_SRCDIR)/%.c
	$(CC) -c -mips1 $(USER_INCLUDE) -I$(SRCDIR)/include $(CFLAGS) $< -o $@

$(USER_OBJDIR)/%.o: $(USER_SRCDIR)/%.S
	$(CC) -c -mips32 -D__ASSEMBLY__ $(USER_INCLUDE) -I$(SRCDIR)/include $(CFLAGS) $< -o $@


# filesystem
TOOL_MKSFS := tools/mksfs
ROOTFS_DIR:= $(USER_OBJDIR)/rootfs
ROOTFS_IMG:= $(USER_OBJDIR)/initrd.img
$(TOOL_MKSFS): tools/mksfs.c
	$(HOSTCC) $(HOSTCFLAGS) -o $@ $^

$(OBJDIR)/ucore-kernel-initrd: $(BUILD_DIR) $(TOOL_MKSFS) $(OBJ) $(USER_APP_BINS) tools/kernel.ld
	rm -rf $(ROOTFS_DIR) $(ROOTFS_IMG)
	mkdir $(ROOTFS_DIR)
	cp $(USER_APP_BINS) $(ROOTFS_DIR)
	cp -r $(USER_SRCDIR)/_archive/* $(ROOTFS_DIR)/
	dd if=/dev/zero of=$(ROOTFS_IMG) count=$(INITRD_BLOCK_CNT)
	$(TOOL_MKSFS) $(ROOTFS_IMG) $(ROOTFS_DIR)
	$(SED) 's%_FILE_%$(ROOTFS_IMG)%g' tools/initrd_piggy.S.in > $(USER_OBJDIR)/initrd_piggy.S
	$(AS) $(USER_OBJDIR)/initrd_piggy.S -o $(USER_OBJDIR)/initrd.img.o
	@echo LINK $@
	$(LD) $(FPGA_LD_FLAGS) $(LDFLAGS_SCRIPT) $(OBJ) \
				 $(USER_OBJDIR)/initrd.img.o -o $@
	rm -rf $(ROOTFS_DIR)

boot/loader.bin: boot/bootasm.S
	$(CC) $(CFLAGS) -g -c -o boot/loader.o $^
	$(LD) $(LDFLAGS) -Ttext 0xbfc00000 -o boot/loader boot/loader.o
	$(OBJCOPY) -O binary -j .text -S boot/loader $@