#
# Copyright (c) 2026, Apollo Telephone Laboratories.
# Provided under the BSD-3 clause.
#

CFILES = $(shell find core/ -name "*.c")
OFILES = $(CFILES:.c=.o)
DFILES = $(CFILES:.c=.d)

CC = gcc
LD = ld

CFLAGS = 						\
	-Wall 						\
	-MMD						\
	-pedantic 					\
	-fpic						\
	-ffreestanding				\
	-fno-stack-protector		\
	-fno-stack-check			\
	-fshort-wchar				\
	-mno-red-zone				\
	-maccumulate-outgoing-args	\
	-Ihead						\
	-Ignu-efi/inc

LDFLAGS =										\
	-shared										\
	-Bsymbolic									\
	-Lgnu-efi/x86_64/lib						\
	-Lgnu-efi/x86_64/gnuefi						\
	-Tgnu-efi/gnuefi/elf_x86_64_efi.lds 		\
	gnu-efi/x86_64/gnuefi/crt0-efi-x86_64.o

OBJCOPY_FLAGS =			\
	-j .text 						\
	-j .sdata 						\
	-j .data 						\
	-j .rodata 						\
	-j .dynamic 					\
	-j .dynsym  					\
	-j .rel 						\
	-j .rela 						\
	-j .rel.* 						\
	-j .rela.* 						\
	-j .reloc 						\
	--output-target efi-app-x86_64 	\
	--subsystem=10

.PHONY: all
all: prebuild gnu-efi $(OFILES)
	ld $(LDFLAGS) $(OFILES) -lgnuefi -lefi -o main.so
	objcopy $(OBJCOPY_FLAGS) main.so BOOTX64.EFI
	rm -f *.so

.PHONY: prebuild
prebuild:
	echo -e "/* Generated by build; DO NOT edit */\n" >head/sboot/config.h
	cat config.def.h >>head/sboot/config.h

gnu-efi:
	git clone https://github.com/ncroxon/gnu-efi.git
	cd gnu-efi; make

-include $(DFILES)
%.o: %.c
	$(CC) -c $(CFLAGS) $< -o $@