#=----------------------------------------------------------------------------=#
#                            GNU GPL OS/K                                      #
#                                                                              #
#   Desc:   Project Makefile                                                   #
#                                                                              #
#                                                                              #
#   Copyright © 2018-2019 The OS/K Team                                        #
#                                                                              #
#   This file is part of OS/K.                                                 #
#                                                                              #
#   OS/K is free software: you can redistribute it and/or modify               #
#   it under the terms of the GNU General Public License as published by       #
#   the Free Software Foundation, either version 3 of the License, or          #
#   any later version.                                                         #
#                                                                              #
#   OS/K is distributed in the hope that it will be useful,                    #
#   but WITHOUT ANY WARRANTY# without even the implied warranty of             #
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the              #
#   GNU General Public License for more details.                               #
#                                                                              #
#   You should have received a copy of the GNU General Public License          #
#   along with OS/K.  If not, see <https://www.gnu.org/licenses/>.             #
#=----------------------------------------------------------------------------=#

.PHONY: all test test32 debug gdb install_mbr dust clean OS/K

## VARIABLES ----------------------------------------------------------------- #

# Debug
mode ?= debug

# Programs
ASM=nasm
LD=x86_64-elf-ld
OBJCOPY=x86_64-elf-objcopy
CCNAME=x86_64-elf-gcc
ASMFLAGS=-f elf64
LDFLAGS=-melf_x86_64
COPTIM=-O2
CWARNS=-Wall -Wextra -Werror=implicit-function-declaration
CINCLUDES=-Iinclude
CFLAGS1=-nostdlib -ffreestanding -mcmodel=large -std=gnu11
CFLAGS2= -c -mno-red-zone -mno-mmx -mno-sse -mno-sse2
CFLAGS=$(CFLAGS1) $(CFLAGS2)

ifeq ($(mode), release)
CFLAGS += -D_NO_DEBUG
dep += dust
endif
ifeq ($(mode), debug)
CFLAGS += -g
endif

KCC=$(CCNAME) $(COPTIM) $(CWARNS) $(CFLAGS) $(CINCLUDES) -D_OSK_SOURCE -D_KALEID_KERNEL -fstack-protector-all

# Folders
MBRDIR=boot/grub
LOADERDIR=boot/loader
KALEIDDIR=kaleid
INCLUDEDIR=include
OBJDIR=build/obj
KOBJDIR=build/obj/kaleid
LOBJDIR=build/obj/boot
BINDIR=build/bin
BUILDDIR=build
vpath %.c $(KALEIDDIR)

# Color codes
CL='\033[0;32m'
CL2='\033[1;36m'
CL3='\033[0m'
NC='\033[1;37m'


## SOURCES INSCRIPTION-------------------------------------------------------- #

# Lib C sources
LibCSources =	libc/atoi.c libc/itoa.c                                        \
		libc/mem.c libc/ctype.c                                        \
		libc/rand.c libc/sprintf.c                                     \
		libc/status.c libc/string.c                                    \
		libc/strtol.c extras/argv.c                                    \
		extras/prog.c

KernObj=$(patsubst %.c,$(KOBJDIR)/%.o,$(KernSources))

# Kernel sources
KernSources =	libbuf/buf.c libbuf/bput.c                                     \
		libbuf/bprint.c kernel/cpu/cpuid.c                             \
		kernel/cpu/idt.c kernel/init/init.c                            \
		kernel/init/table.c kernel/io/cursor.c                         \
		kernel/ke/log.c kernel/io/vga.c                                \
		kernel/ke/panic.c kernel/mm/map.c                              \
		kernel/mm/heap.c kernel/mm/malloc.c                            \
		kernel/mm/gdt.c kernel/ps/sched.c                              \
		kernel/init/info.c kernel/init/ssp.c                           \

LibCObj=$(patsubst %.c,$(KOBJDIR)/%.o,$(LibCSources))


## KALEID MAKEFILE ----------------------------------------------------------- #

all : OS/K $(dep)

## MISC MAKEFILE ------------------------------------------------------------- #
./ProjectTree: ./.stylehlp_sh
	@cat ./.stylehlp_sh > ./ProjectTree
	@echo "\n" >> ./ProjectTree
	@tree --dirsfirst >> ./ProjectTree
	@echo ${CL2}[$@] ${CL}Generated.${CL3}

$(KOBJDIR):
	@mkdir -p $(KOBJDIR)

## LIB C MAKEFILE ------------------------------------------------------------ #
$(KOBJDIR)/libc/atoi.o: $(KALEIDDIR)/libc/atoi.c $(INCLUDEDIR)/*/*.h | $(KOBJDIR)
	@mkdir -p $(shell dirname $@)
	@$(KCC) -D_NEED_ATOI $< -o $@.1
	@$(KCC) -D_NEED_ATOL $< -o $@.2
	@$(KCC) -D_NEED_ATOU $< -o $@.3
	@$(KCC) -D_NEED_ATOUL $< -o $@.4
	@$(LD) -r $@.1 $@.2 $@.3 $@.4 -o $@
	@rm -f $@.1 $@.2 $@.3 $@.4
	@echo ${CL2}[$@] ${CL}Compiled.${CL3}

$(KOBJDIR)/libc/itoa.o: $(KALEIDDIR)/libc/itoa.c $(INCLUDEDIR)/*/*.h | $(KOBJDIR)
	@mkdir -p $(shell dirname $@)
	@$(KCC) -D_NEED_ITOA $< -o $@.1
	@$(KCC) -D_NEED_LTOA $< -o $@.2
	@$(KCC) -D_NEED_UTOA $< -o $@.3
	@$(KCC) -D_NEED_ULTOA $< -o $@.4
	@$(LD) -r $@.1 $@.2 $@.3 $@.4 -o $@
	@rm -f $@.1 $@.2 $@.3 $@.4
	@echo ${CL2}[$@] ${CL}Compiled.${CL3}

$(KOBJDIR)/libc/mem.o: $(KALEIDDIR)/libc/mem.c $(INCLUDEDIR)/*/*.h | $(KOBJDIR)
	@mkdir -p $(shell dirname $@)
	@$(KCC) -fno-strict-aliasing $< -o $@
	@echo ${CL2}[$@] ${CL}Compiled.${CL3}

## MAIN MAKEFILE ------------------------------------------------------------- #

$(KOBJDIR)/%.o: %.c $(INCLUDEDIR)/*/*.h | $(KOBJDIR)
	@mkdir -p $(shell dirname $@)
	@$(KCC) $< -o $@
	@echo ${CL2}[$@] ${CL}Compiled.${CL3}

test: all
	@qemu-system-x86_64 -m 4G -hda $(BUILDDIR)/bin/disk.img \
	-d cpu_reset,guest_errors,pcall,int 2> $(BUILDDIR)/qemu.log &

test32: all
	@qemu-system-i386 -hda $(BUILDDIR)/bin/disk.img -d cpu_reset,guest_errors,pcall,int 2> $(BUILDDIR)/qemu.log &

debug: all
	@qemu-system-x86_64 -m 64M -hda $(BUILDDIR)/bin/disk.img -no-reboot \
	-no-shutdown -d cpu_reset,guest_errors,pcall,int 2> $(BUILDDIR)/qemu.log &
	@ndisasm $(BINDIR)/kaleid -o 0x00100000 -b 64 > $(BUILDDIR)/kaleid64_disasm.asm
	@ndisasm $(BINDIR)/kaleid -o 0x00100000 -b 32 > $(BUILDDIR)/kaleid32_disasm.asm

gdb: all
	@qemu-system-x86_64 -m 64M -hda $(BUILDDIR)/bin/disk.img -no-reboot \
	-no-shutdown -d cpu_reset,guest_errors,pcall,int -s 2> $(BUILDDIR)/qemu.log &
	@ndisasm $(BINDIR)/kaleid -o 0x00100000 -b 64 > kaleid64_disasm.asm
	@ndisasm $(BINDIR)/kaleid -o 0x00100000 -b 32 > kaleid32_disasm.asm
	@gdb \
	-ex "set arch i386:x86-64:intel"   \
	-ex "target remote localhost:1234" \
	-ex "symbol-file $(BINDIR)/kaleid" \
	-ex "break BtStartKern"            \

install_mbr: $(BINDIR)/disk.img $(MBRDIR)/grub.cfg
	@mkdir -p $(BINDIR)/disk
	@echo ${CL2}[$@] ${NC}Installing MBR on image...${CL3}
	-@$(MBRDIR)/umount.sh $(BINDIR)/disk || /bin/true
	@$(MBRDIR)/grub-install.sh $(BINDIR)/disk.img $(BINDIR)/disk $(MBRDIR)/grub.cfg
	@rmdir $(BINDIR)/disk
	@echo ${CL2}[$@] ${CL}Success.${CL3}

dust:
	-@$(MBRDIR)/umount.sh $(BINDIR)/disk || /bin/true
	@rm -Rf $(OBJDIR)/*
	@echo ${CL2}[$@] ${CL}Cleaned.${CL3}
clean:
	-@$(MBRDIR)/umount.sh $(BINDIR)/disk || /bin/true
	@rm -Rvf ./ProjectTree $(BUILDDIR)/*.log
	@rm -Rvf $(BINDIR)/* $(OBJDIR)/*
	@echo ${CL2}[$@] ${CL}Cleaned.${CL3}

$(BINDIR)/kaleid: $(LOBJDIR)/kaleid.x86_64
	@echo ${CL2}[$@] ${NC}Objcopy...${CL3}
	@$(OBJCOPY) -I elf64-x86-64 -O elf32-i386 $(LOBJDIR)/kaleid.x86_64 $(BINDIR)/kaleid
	@echo ${CL2}[$@] ${CL}Success.${CL3}

$(LOBJDIR)/kaleid.x86_64: $(LibCObj) $(KernObj) $(LOBJDIR)/loader.o
	@echo ${CL2}[$@] ${NC}Linking kernel objects...${CL3}
	@$(LD) $(LDFLAGS) -T $(BUILDDIR)/kernel.ld			\
		$(LOBJDIR)/loader.o $(KernObj) $(LibCObj)		\
		-o $(LOBJDIR)/kaleid.x86_64
	@echo ${CL2}[$@] ${CL}Success.${CL3}

$(LOBJDIR)/loader.o: $(LOADERDIR)/loader.asm $(LOADERDIR)/*/*.inc
	@echo ${CL2}[$@] ${NC}Making loader...${CL3}
	@mkdir -p $(shell dirname $@)
	@$(ASM) $(ASMFLAGS) $(LOADERDIR)/loader.asm -o $(LOBJDIR)/loader.o > /dev/null
	@echo ${CL2}[$@] ${CL}Success.${CL3}

$(BINDIR)/disk.img: $(MBRDIR)/create_disk.sh
	@echo ${CL2}[$@]${NC} Constructing disk image...${CL3}
	-@$(MBRDIR)/umount.sh $(BINDIR)/disk || /bin/true
	@$(MBRDIR)/create_disk.sh $(BINDIR)/disk.img
	@make install_mbr
	@echo ${CL2}[$@]${NC} Constructing disk image...${CL3}

OS/K: $(BINDIR)/kaleid $(BINDIR)/disk.img ./ProjectTree
	@mkdir -p $(BINDIR)/disk
	@echo ${CL2}[[$@]] ${NC}Integrating kernel, $(mode) mode.${CL3}
	-@$(MBRDIR)/umount.sh $(BINDIR)/disk || /bin/true
	@$(MBRDIR)/mount.sh $(BINDIR)/disk.img $(BINDIR)/disk
	@cp $(BINDIR)/kaleid $(BINDIR)/disk/boot/kaleid
	@$(MBRDIR)/umount.sh $(BINDIR)/disk
	@echo ${CL2}[[$@]] ${CL}Success.${CL3}
	@rmdir $(BINDIR)/disk