Makefile

# This is free and unencumbered software released into the public domain.

# Anyone is free to copy, modify, publish, use, compile, sell, or
# distribute this software, either in source code form or as a compiled
# binary, for any purpose, commercial or non-commercial, and by any
# means.

# In jurisdictions that recognize copyright laws, the author or authors
# of this software dedicate any and all copyright interest in the
# software to the public domain. We make this dedication for the benefit
# of the public at large and to the detriment of our heirs and
# successors. We intend this dedication to be an overt act of
# relinquishment in perpetuity of all present and future rights to this
# software under copyright law.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.

# For more information, please refer to <https://unlicense.org>

WORKING_DIRECTORY    = "$(shell dirname $(realpath $(firstword $(MAKEFILE_LIST))))"

kernel_source_files := $(shell find src/impl/kernel -name *.c)
kernel_object_files := $(patsubst src/impl/kernel/%.c, build/kernel/%.o, $(kernel_source_files))

x86_64_c_source_files := $(shell find src/impl/x86_64 -name *.c)
x86_64_c_object_files := $(patsubst src/impl/x86_64/%.c, build/x86_64/%.o, $(x86_64_c_source_files))

x86_64_asm_source_files := $(shell find src/impl/x86_64 -name *.asm)
x86_64_asm_object_files := $(patsubst src/impl/x86_64/%.asm, build/x86_64/%.o, $(x86_64_asm_source_files))

x86_64_object_files := $(x86_64_c_object_files) $(x86_64_asm_object_files)

$(kernel_object_files): build/kernel/%.o : src/impl/kernel/%.c
	mkdir -p $(dir $@) && \
	x86_64-elf-gcc -c -I src/intf -ffreestanding $(patsubst build/kernel/%.o, src/impl/kernel/%.c, $@) -o $@

$(x86_64_c_object_files): build/x86_64/%.o : src/impl/x86_64/%.c
	mkdir -p $(dir $@) && \
	x86_64-elf-gcc -c -I src/intf -ffreestanding $(patsubst build/x86_64/%.o, src/impl/x86_64/%.c, $@) -o $@

$(x86_64_asm_object_files): build/x86_64/%.o : src/impl/x86_64/%.asm
	mkdir -p $(dir $@) && \
	nasm -f elf64 $(patsubst build/x86_64/%.o, src/impl/x86_64/%.asm, $@) -o $@

.PHONY: build-x86_64
build-x86_64: $(kernel_object_files) $(x86_64_object_files)
	mkdir -p dist/x86_64 && \
	x86_64-elf-ld -n -o dist/x86_64/kernel.bin -T targets/x86_64/linker.ld $(kernel_object_files) $(x86_64_object_files) && \
	cp dist/x86_64/kernel.bin targets/x86_64/iso/boot/kernel.bin && \
	grub-mkrescue /usr/lib/grub/i386-pc -o dist/x86_64/kernel.iso targets/x86_64/iso

setup:
	docker build buildenv -t myos-buildenv

enter:
	docker run --rm -it -v "$(WORKING_DIRECTORY)":/root/env myos-buildenv

run:
	qemu-system-x86_64 -cdrom dist/x86_64/kernel.iso