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CFLAGS ?= -Wall -std=gnu99 -O2
ARM_BASE ?= arm-none-eabi
ARM_CC ?= $(ARM_BASE)-gcc
ARM_CFLAGS ?= -mcpu=cortex-a7 -ffreestanding -std=gnu11 -Wall \
-Wextra $(addprefix -I, $(dirs))
ARM_AS ?= $(ARM_BASE)-as
ARM_OBJCOPY ?= $(ARM_BASE)-objcopy
ARM_ELFFLAGS ?= -nostdlib -lgcc
KERNEL_STAGE2_OBJECTS := setup.o interrupt_vector.o interrupts.o \
uart.o demo_functionality.o paging.o ramfs_embeddable.o \
ramfs.o strings.o io.o atags.o scheduler.o
PL_0_TEST_OBJECTS := PL0_utils.o svc.o PL0_test.o strings.o io.o
LOADER_STAGE2_OBJECTS := uart.o strings.o io.o loader_stage2.o
RAMFS_FILES := PL0_test.img
empty:=
space:= $(empty) $(empty)
dirs:=$(shell find ../src/ -type d)
dirs_colon:=$(subst $(space),:,$(dirs))
vpath %.S $(dirs_colon)
vpath %.c $(dirs_colon)
vpath %.ld $(dirs_colon)
all : kernel.img
%.o : %.c
$(if $(findstring /arm/,$<),\
$(ARM_CC) $(ARM_CFLAGS),$(HOST_CC) $(HOST_CFLAGS)) -c $< -o $@
%.img : %.elf
$(ARM_OBJCOPY) $^ -O binary $@
%.o: %.S
$(ARM_AS) -mcpu=cortex-a7 $< -o $@
%_embeddable.o : %.img
$(ARM_OBJCOPY) -I binary -O elf32-littlearm -B arm $^ $@
%.elf : %.ld
$(ARM_CC) -T $< -o $@ $(ARM_ELFFLAGS) $(filter %.o,$^)
PL0_test.elf : $(PL_0_TEST_OBJECTS)
kernel.elf : kernel_stage1.o
kernel_stage2.elf : $(KERNEL_STAGE2_OBJECTS)
loader_stage2.elf : $(LOADER_STAGE2_OBJECTS)
loader.elf : loader_stage1.o
kernel_stage1.o : kernel_stage2.img
loader_stage1.o : loader_stage2.img
ramfs.img : makefs $(RAMFS_FILES)
./makefs $(RAMFS_FILES) > $@
qemu-elf : kernel.elf
qemu-system-arm -m 256 -M raspi2 -serial stdio -kernel $^
qemu-bin : kernel.img
qemu-system-arm -m 256 -M raspi2 -serial stdio -kernel $^
qemu-loader : loader.img kernel.img pipe_image
./pipe_image | \
qemu-system-arm -m 256 -M raspi2 -serial stdio -kernel $<
run-on-rpi : kernel.img pipe_image
./pipe_image | \
sudo socat FILE:/dev/ttyUSB0,b115200,raw -
sudo screen /dev/ttyUSB0 115200,cs8,-parenb,-cstopb,-hupcl
clean :
-rm -f *.img *.elf *.o pipe_image makefs
.PHONY: all qemu-elf qemu-bin qemu-loader run-on-rpi clean
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