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# gbos - Game Boy Color Unix-flavored microkernel (scaffold)
# Toolchain: RGBDS (rgbasm/rgblink/rgbfix)
ROM := gbos.gb
BUILD := build
SRCS := $(wildcard src/*.asm)
OBJS := $(patsubst src/%.asm,$(BUILD)/%.o,$(SRCS))
ASFLAGS := -I include -Wall
# MBC5 + RAM + battery; -r 3 = 32 KiB cart RAM (bump for more task banks)
FIXFLAGS := -v -C -m MBC5+RAM+BATTERY -r 4 -p 0xFF -t GBOS
.PHONY: all clean run
all: $(ROM)
$(BUILD)/%.o: src/%.asm | $(BUILD)
rgbasm $(ASFLAGS) -o $@ $<
# C programs: compiled with SDCC into ROM-bank blobs and INCBIN'd by programs.asm
CBLOBS := c/chello.bin c/echo.bin c/true.bin c/false.bin c/uname.bin \
c/pid.bin c/cat.bin c/wc.bin c/head.bin c/args.bin \
c/ls.bin c/save.bin c/rm.bin c/sh.bin c/ps.bin c/kill.bin c/spin.bin c/blk.bin c/mkdir.bin c/count.bin c/ptest.bin
$(BUILD)/programs.o: $(CBLOBS)
# C programs also depend on the shared libc sources
$(CBLOBS): c/libc.c c/gbos.h
c/%.bin: c/%.c c/crt0.s c/libc.s c/build.sh
sh c/build.sh $< $@
$(ROM): $(OBJS)
rgblink -m $(BUILD)/gbos.map -n $(BUILD)/gbos.sym -o $@ $(OBJS)
rgbfix $(FIXFLAGS) $@
$(BUILD):
mkdir -p $(BUILD)
clean:
rm -rf $(BUILD) $(ROM)
# convenience: run in an emulator if one is on PATH
run: $(ROM)
@which sameboy >/dev/null 2>&1 && sameboy $(ROM) || \
which bgb >/dev/null 2>&1 && bgb $(ROM) || \
echo "no emulator found (sameboy/bgb)"
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