Initial commit: bootstrap

1 files changed, 47 insertions, 0 deletions

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..475c160
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,47 @@
+.POSIX:
+.SUFFIXES:
+.PHONY: clean run
+
+# Compiler.
+AS      := arm-none-eabi-as
+CC      := arm-none-eabi-gcc
+OBJCOPY := arm-none-eabi-objcopy
+
+# Paths.
+SRC_DIR   := src
+BUILD_DIR := build
+
+# Output files.
+ELF := $(BUILD_DIR)/kernel7.elf
+IMG := $(BUILD_DIR)/kernel7.img
+
+# Bootstrapping files.
+OBJ_START = $(BUILD_DIR)/start.o
+OBJ_MAIN = $(BUILD_DIR)/main.o
+SRC_LINK = $(SRC_DIR)/linker.ld
+
+CFLAGS := -Wall -ffreestanding -O2 -nostdlib -lgcc -mgeneral-regs-only
+AFLAGS :=
+
+default: $(IMG)
+
+$(BUILD_DIR)/%.o: $(SRC_DIR)/%.s
+        $(AS) $(AFLAGS) -o $@ -c $<
+
+$(BUILD_DIR)/%.o: $(SRC_DIR)/%.c
+        $(CC) $(CFLAGS) -o $@ -c $<
+
+$(IMG): $(BUILD_DIR) $(ELF)
+        $(OBJCOPY) $(ELF) -O binary $(IMG)
+
+$(ELF): $(OBJ_START) $(OBJ_MAIN)
+        $(CC) $(CFLAGS) -T $(SRC_LINK) -o $(ELF) $(OBJ_START) $(OBJ_MAIN)
+
+clean:
+        rm -rf $(BUILD_DIR)
+
+$(BUILD_DIR):
+        mkdir -p $(BUILD_DIR)
+
+run: $(IMG)
+        qemu-system-aarch64 -M raspi3 -kernel $(IMG) -d in_asm -serial null -serial stdio