moss/Makefile at master · Magicrafter13/moss · GitHub

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# I AM NOT RESPONSIBLE FOR DATA LOSS, USE THIS FILE AT YOUR OWN RISK
# (the only targets with possible risk are the ones that start with "write",
# because these use `dd` to directly write to what is supposed to be a floppy
# disk drive - I have tried to take caution using the HEAD variable below to
# make sure dd only ever writes to a specific USB device I have, but I cannot
# ever guarantee this is safe)

# ======================================
# Things the user should probably change
# ======================================

# Device path to floppy disk drive
DEV  := /dev/sdc
# Desired mount location (also used when creating the disk image)
DEST := /mnt
# First 2 lines that fdisk -l $(DEV) outputs - basically whatever will let you
# be certain you're writing to the floppy drive and not something else because
# this Makefile WILL DESTROY THE MBR OF $(DEV)
HEAD := 'Disk $(DEV): 720 KiB, 737280 bytes, 1440 sectors Disk model: USB UF000x'

# Replace this with doas, or whatever program you wish
RUN_AS_ROOT := sudo

# ==========================================
# Things the user probably should NOT change
# ==========================================

SOURCE_DIR := src
SOURCES    := $(shell find $(SOURCE_DIR) -type f -name '*.s')

# You shouldn't need to modify anything below here normally - maybe L2 if you
# want to automate populating the disk with custom .bin files

# Disk components
L1 := bootloader fat fat root data
# Files that go on the disk image
L2 := kernel moss basici
# Anything else
L3 := $(filter-out $(L1) $(L2),$(SOURCES:$(SOURCE_DIR)/%.s=%))

# Created files
IMAGE    := boot.bin
TEMPLATE := bins/blank-disk.bin
DISK     := $(L1:%=bins/%.bin)
FILE     := $(L2:%=bins/%.bin)
MISC     := $(L3:%=bins/%.bin)

# No need to call sudo if we're already root. This helps prevent that.
ifeq ($(shell echo $$EUID),0)
sudo = $(1)
else
sudo = $(RUN_AS_ROOT) $(1)
endif

# =====================
# Main callable targets
# =====================

# Fully formed bootable floppy disk image - keep template as first prerequisite
$(IMAGE): $(TEMPLATE) $(FILE)
	@if test $< -nt $@; then echo copying template; cp -f $< $@; fi
	$(call sudo,mount) $@ $(DEST)
	@if ! $(MAKE) copy-bins --no-print-directory SAFE=yes; then $(call sudo,umount) $(DEST); exit 1; fi
	$(call sudo,umount) $(DEST)

run:
	@if ! [ -f $(IMAGE) ]; then $(MAKE) $(IMAGE) --no-print-directory; fi
	qemu-system-x86_64 -fda $(IMAGE)

clean:
	rm -f $(IMAGE) $(TEMPLATE) $(DISK) $(FILE)

.PHONY: run clean

# ================================================
# Real device writing targets (WARNING: uses `dd`)
# ================================================

SAFE :=

verification_command = if ! $(call sudo,fdisk) -l $(DEV) | tr '\n' ' ' | grep $(HEAD); then echo 'Could not verify $(DEV) to be desired drive.'; exit 1; fi

# Write to a REAL floppy disk
write:
	@$(verification_command)
	@$(MAKE) write-bootloader --no-print-directory SAFE=yes
	@$(MAKE) write-files --no-print-directory SAFE=yes

# DESTROYS MBR :)
write-bootloader: bins/bootloader.bin
ifeq ($(SAFE),yes)
	$(call sudo,dd) bs=512 if=$< of=$(DEV)
else
	@$(verification_command)
	@$(MAKE) $@ --no-print-directory SAFE=yes
endif

# simply mounts and copies files
write-files: $(FILE)
ifeq ($(SAFE),yes)
	$(call sudo,mount) $(DEV) $(DEST)
	@$(MAKE) copy-bins --no-print-directory
	$(call sudo,umount) $(DEST)
else
	@$(verification_command)
	@$(MAKE) $@ --no-print-directory SAFE=yes
endif

define execute
$(1)

endef

# Don't call this directly...
copy-bins:
ifeq ($(SAFE),yes)
	@$(foreach f,$(L2),$(call execute,@$(MAKE) $(DEST)/$(shell echo $(f) | tr '[:lower:]' '[:upper:]').BIN))
else
	@echo PLEASE do not call this target directly :\)
	@exit 2
endif

.PHONY: write write-bootloader write-files copy-bins

# ===================
# File creation rules
# ===================

$(TEMPLATE): $(DISK)
	cat $+ > $@

define bin_template =
bins/$(1).bin: $(SOURCE_DIR)/$(1).s $(foreach f,$(shell grep '%include' $(SOURCE_DIR)/$(1).s | awk -F'"' '{print $$2}'),$(SOURCE_DIR)/$(f))
	@mkdir -p $$(dir $$@)
	nasm -f bin -I $(SOURCE_DIR) $$< -o $$@

$(DEST)/$(shell echo $(notdir $(basename $(1))) | cut -d ' ' -f 1 | cut -c -8 | tr '[:lower:]' '[:upper:]').BIN: bins/$(1).bin
	$(call sudo,cp) -f $$< $$@

endef
$(foreach f,$(sort $(L1) $(L2) $(L3)),$(eval $(call bin_template,$(f))))

#$(DEST)/%.BIN:
#	$(call sudo,cp) --update=older bins/$(shell echo $(notdir $(basename $@)) | tr '[:upper:]' '[:lower:]').bin $@