31 lines
851 B
Makefile
31 lines
851 B
Makefile
# Expects variables:
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# STAGE3: path to linked stage 3 binary
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# STAGE2_SECTOR: the index of the first sector
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# of the stage 2 binary on the disk it will be written to.
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BIOS_SRC = ./bios
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# Wrap bootloader in three-stage BIOS loader
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$(BIOS_BUILD)/bios.bin: $(wildcard $(BIOS_SRC)/*.asm) $(BUILD)/bios.elf
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@mkdir -p "$(BIOS_BUILD)"
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nasm \
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-f bin \
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-D STAGE3="$(BUILD)/bios.elf" \
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-D STAGE2_SECTOR=$(STAGE2_SECTOR) \
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-o "$@" \
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-l "$@.lst" \
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-i "$(BIOS_SRC)" \
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"$(BIOS_SRC)/main.asm"
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# Extract MBR (first 440 bytes)
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$(BIOS_BUILD)/bios.mbr.bin: $(BIOS_BUILD)/bios.bin
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@mkdir -p "$(BIOS_BUILD)"
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@echo ""
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dd if="$(BIOS_BUILD)/bios.bin" bs=440 count=1 of="$@"
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# Extract stage 2 (rest of file)
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$(BIOS_BUILD)/bios.stage2.bin: $(BIOS_BUILD)/bios.bin
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@mkdir -p "$(BIOS_BUILD)"
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@echo ""
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dd if="$(BIOS_BUILD)/bios.bin" bs=512 skip=1 of="$@"
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