#=----------------------------------------------------------------------------=#
#                                 OS on Kaleid                                 #
#                                                                              #
#   Desc:   Project Makefile                                                   #
#                                                                              #
#                                                                              #
#   Copyright © 2018-2020 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 testnokvm testnosnd test32 debug gdb ddd gdbnokvm dddnokvm installonimage dust clean OS/K run update-cross-cc
.DELETE_ON_ERROR: $(BINDIR)/kaleid
.DEFAULT_GOAL := all

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

# Debug
mode ?= debug
ram ?= 4G
cpu ?= core2duo
compile-cross-cc ?= no

# Cross-cc
CROSS-CC-DIR := $(shell pwd)/cross-cc
LATEST-CROSS-CC := https://gitlab.os-k.eu/os-k-team/cross-cc-builder/uploads/fcb43b0cc04c75ff89e40b4b24567484/cross-cc.tar.xz
LATEST-CROSS-CC-SOURCES := https://gitlab.os-k.eu/os-k-team/cross-cc-builder/-/archive/master/cross-cc-builder-master.tar
export PATH := $(CROSS-CC-DIR)/bin:$(PATH)
NTHREADS := $(shell nproc)

# Programs
ASM=nasm
LD=x86_64-elf-ld
OBJCOPY=x86_64-elf-objcopy
CCNAME=x86_64-elf-gcc

# Flags
ASMFLAGS=-f elf64
LDFLAGS=-melf_x86_64
COPTIM=-O2
CWARNS=-Wall -Wextra -Wno-unused-parameter -Wno-implicit-fallthrough -Werror=implicit-function-declaration -Werror=return-type #-Wpadded
CINCLUDES=-Iinclude -Iinclude/drivers -Iinclude/kernel
CFLAGS1=-nostdlib -ffreestanding -mcmodel=large -std=gnu11 -fstack-protector-strong -fdump-rtl-expand
CFLAGS2= -c -mno-red-zone -mno-mmx -mno-sse -mno-sse2
CFLAGS= $(CFLAGS1) $(CFLAGS2)
CFLAGS_MATHS= $(CFLAGS1) -c -mno-red-zone -mno-mmx

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

# GCC
KCC=$(CCNAME) $(COPTIM) $(CWARNS) $(CFLAGS) $(CINCLUDES) \
 -D_OSK_SOURCE -D_KALEID_KERNEL

KCC_MATHS=$(CCNAME) $(COPTIM) $(CWARNS) $(CFLAGS_MATHS) $(CINCLUDES) \
 -D_OSK_SOURCE -D_KALEID_KERNEL

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

# Installation parameters
installdisk ?= $(BINDIR)/disk.img

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


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

# Lib C sources + libbuf source
LibCSources =	libc/mem.c libc/ctype.c					\
		libc/rand.c libc/sprintf.c				\
		libc/errno.c libc/string.c				\
		libc/strtol.c						\
		libbuf/bopen.c libbuf/bputc.c libbuf/bscroll.c		\
		libbuf/bprint.c libbuf/bgetc.c libbuf/bscan.c		\
		libbuf/bflush.c libbuf/bwrite.c libbuf/bread.c		\
		libbuf/bmisc.c libbuf/bclose.c				\

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

LibCObj += $(KOBJDIR)/libc/atoi.o $(KOBJDIR)/libc/itoa.o

# Kernel sources
KernSources =	kernel/ke/cpuid.c kernel/mm/paging.c			\
		kernel/ke/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			\
		kernel/ke/rtc.c kernel/io/keyb.c			\
		kernel/io/spkr.c kernel/po/shtdwn.c			\
		kernel/sh/shell.c kernel/sh/shcmds.c			\
		kernel/sh/musage.c kernel/sh/argv.c 			\
		kernel/ke/pit.c	kernel/sh/testcmds.c 			\
		kernel/mm/palloc.c kernel/io/acpi.c 			\
		kernel/io/pci.c

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

# Drivers sources
DriverSources =	drivers/ata.c

DriverObj=$(patsubst %.c,$(KOBJDIR)/%.o,$(DriverSources))
DriverDep=$(patsubst %.c,$(KOBJDIR)/%.d,$(DriverSources))

-include $(LibCDep)
-include $(KernDep)
-include $(DriverDep)


## MISC MAKEFILE ------------------------------------------------------------- #

ifeq ($(compile-cross-cc), no)
$(CROSS-CC-DIR)/bin/x86_64-elf-gcc:
	@echo ${CL2}[$@] ${NC} Downloading and extracting the cross-compiler...${CL3}
	@wget $(LATEST-CROSS-CC) -O $(CROSS-CC-DIR).tar.xz -q -c --show-progress
	@tar -xaf $(CROSS-CC-DIR).tar.xz --skip-old-files
	@echo ${CL2}[$@] ${CL}Success.${CL3}
endif

ifeq ($(compile-cross-cc), yes)
$(CROSS-CC-DIR)/bin/x86_64-elf-gcc:
	@echo ${CL2}[$@] ${NC} Downloading and extracting the cross-compiler sources...${CL3}
	@wget $(LATEST-CROSS-CC-SOURCES) -O $(CROSS-CC-DIR)-builder.tar -q -c --show-progress
	@mkdir -p $(CROSS-CC-DIR)-builder
	@tar -xvf $(CROSS-CC-DIR)-builder.tar --skip-old-files -C $(CROSS-CC-DIR)-builder --strip-components 1
	cd $(CROSS-CC-DIR)-builder && make
	ln -s $(CROSS-CC-DIR)-builder/cross-cc $(CROSS-CC-DIR)
	@echo ${CL2}[$@] ${CL}Success.${CL3}
endif

./ProjectTree: ./.stylehlp_sh
	@cat ./.stylehlp_sh > ./ProjectTree
	@echo "\n" >> ./ProjectTree
	@tree --dirsfirst -I "bin|obj">> ./ProjectTree
	@echo ${CL2}[$@] ${CL}Generated.${CL3}

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

wc:
	@rm -f build/kaleid*_disasm.asm
	@cat $(shell find -name *.[ch]) $(shell find -name *.asm) $(shell find -name *.inc) | wc -l

egypt: CFLAGS := -DNDEBUG $(filter-out -fstack-protector-all,$(CFLAGS))
egypt: dust $(LibCObj) $(KernObj) $(DriverObj)
	@find -name '*.expand' -o -name '*.expand' | xargs cat > rtl_exp.out
	@egypt < rtl_exp.out | dot -Tps -o osk-graph.ps
	@rm -f rtl_exp.out
	@evince osk-graph.ps &

## LIB C MAKEFILE ------------------------------------------------------------ #

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


## KERNEL SPECIAL RECIPES MAKEFILE ------------------------------------------- #

$(KOBJDIR)/kernel/ke/idt.o: $(KALEIDDIR)/kernel/ke/idt.c \
	$(KALEIDDIR)/kernel/ke/isr.asm  | $(KOBJDIR)
	@mkdir -p $(shell dirname $@)
	@$(ASM) $(ASMFLAGS) $(KALEIDDIR)/kernel/ke/isr.asm -o $@.1
	@$(KCC) $< -o $@.2
	@$(LD) $(LDFLAGS) -r $@.1 $@.2 -o $@
	@rm -f $@.1 $@.2
	@echo ${CL2}[$@] ${CL}Compiled.${CL3}

$(KOBJDIR)/kernel/ke/cpuid.o: $(KALEIDDIR)/kernel/ke/cpuid.c \
	$(KALEIDDIR)/kernel/ke/cpuf.asm  | $(KOBJDIR)
	@mkdir -p $(shell dirname $@)
	@$(ASM) $(ASMFLAGS) $(KALEIDDIR)/kernel/ke/cpuf.asm -o $@.1
	@$(KCC_MATHS) $< -o $@.2
	@$(LD) $(LDFLAGS) -r $@.1 $@.2 -o $@
	@rm -f $@.1 $@.2
	@echo ${CL2}[$@] ${CL}Compiled.${CL3}

$(KOBJDIR)/kernel/ke/shcmds.o: $(KALEIDDIR)/kernel/sh/shcmds.c | $(KOBJDIR)
	@mkdir -p $(shell dirname $@)
	@$(KCC_MATHS) -MM -MT $(@:%.d=%.o) -MF $@ $<
	@echo ${CL2}[$@] ${CL}Compiled.${CL3}

$(KOBJDIR)/kernel/mm/paging.o: $(KALEIDDIR)/kernel/mm/paging.c \
	$(KALEIDDIR)/kernel/mm/paging.asm  | $(KOBJDIR)
	@mkdir -p $(shell dirname $@)
	@$(ASM) $(ASMFLAGS) $(KALEIDDIR)/kernel/mm/paging.asm -o $@.1
	@$(KCC) $< -o $@.2
	@$(LD) $(LDFLAGS) -r $@.1 $@.2 -o $@
	@rm -f $@.1 $@.2
	@echo ${CL2}[$@] ${CL}Compiled.${CL3}

$(KOBJDIR)/kernel/mm/gdt.o: $(KALEIDDIR)/kernel/mm/gdt.c \
	$(KALEIDDIR)/kernel/mm/gdt.asm  | $(KOBJDIR)
	@mkdir -p $(shell dirname $@)
	@$(ASM) $(ASMFLAGS) $(KALEIDDIR)/kernel/mm/gdt.asm -o $@.1
	@$(KCC) $< -o $@.2
	@$(LD) $(LDFLAGS) -r $@.1 $@.2 -o $@
	@rm -f $@.1 $@.2
	@echo ${CL2}[$@] ${CL}Compiled.${CL3}

## DRIVERS SPECIAL RECIPES MAKEFILE ------------------------------------------ #

$(KOBJDIR)/drivers/ata.o: $(KALEIDDIR)/drivers/ata.c $(KALEIDDIR)/drivers/ata.asm | $(KOBJDIR)
	@mkdir -p $(shell dirname $@)
	@$(ASM) $(ASMFLAGS) $(KALEIDDIR)/drivers/ata.asm -o $@.1
	@$(KCC) $< -o $@.2
	@$(LD) $(LDFLAGS) -r $@.1 $@.2 -o $@
	@rm -f $@.1 $@.2
	@echo ${CL2}[$@] ${CL}Compiled.${CL3}


## DEPENDENCIES MAKEFILE ----------------------------------------------------- #

$(KOBJDIR)/%.d: %.c $(CROSS-CC-DIR)/bin/x86_64-elf-gcc | $(KOBJDIR)
	@mkdir -p $(shell dirname $@)
	@$(KCC) -MM -MT $(@:%.d=%.o) -MF $@ $<
	@echo ${CL2}[$@] ${CL}Dependencies generated.${CL3}

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

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

$(BINDIR)/kaleid: $(LOBJDIR)/kaleid.x86_64
	@echo ${CL2}[$@] ${NC}Objcopy...${CL3}
	@mkdir -p $(shell dirname $@)
	@$(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) $(DriverObj) \
	$(LOBJDIR)/loader.o $(BUILDDIR)/kernel.ld
	@echo ${CL2}[$@] ${NC}Linking kernel objects...${CL3}
	@mkdir -p $(shell dirname $@)
	@$(LD) $(LDFLAGS) -T $(BUILDDIR)/kernel.ld			\
		$(LOBJDIR)/loader.o $(KernObj) $(DriverObj) $(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}

OS/K: $(dep) ./ProjectTree $(BINDIR)/kaleid
	@echo ${CL2}[[$@]] ${NC} OS/K successfully made, $(mode) mode.${CL3}

all : $(CROSS-CC-DIR)/bin/x86_64-elf-gcc
	@make OS/K -j $(NTHREADS)
## QEMU/DEBUG RELATED

test: all installonimage
	@qemu-system-x86_64 -vga std -enable-kvm -machine type=q35 -soundhw pcspk -cpu host -s \
	 -rtc base=localtime -m $(ram) -hda $(installdisk) -net nic,model=rtl8139  \
	 -d cpu_reset,guest_errors,pcall,int 2> $(BUILDDIR)/qemu.log &

run: test

testnokvm: all installonimage
	@qemu-system-x86_64 -vga std -cpu $(cpu) -soundhw pcspk -s \
	 -rtc base=localtime -m $(ram) -hda $(installdisk) \
	 -d cpu_reset,guest_errors,pcall,int 2> $(BUILDDIR)/qemu.log &

testnosnd: all installonimage
	@qemu-system-x86_64 -vga std -enable-kvm -cpu host -s \
	 -rtc base=localtime -m $(ram) -hda $(installdisk) \
	 -d cpu_reset,guest_errors,pcall,int 2> $(BUILDDIR)/qemu.log &

test32: all installonimage
	@qemu-system-i386 -m $(ram) -hda $(installdisk) -d \
	 cpu_reset,guest_errors,pcall,int 2> $(BUILDDIR)/qemu.log &

gdb: all installonimage
	@setsid qemu-system-x86_64 -m $(ram) -enable-kvm -rtc base=localtime \
	 -hda $(installdisk) -no-reboot -no-shutdown -d \
	 cpu_reset,guest_errors,pcall,int -s -S 2> $(BUILDDIR)/qemu.log &
	@gdb \
	-ex "set arch i386:x86-64:intel"   \
	-ex "target remote localhost:1234" \
	-ex "symbol-file $(BINDIR)/kaleid" \
	-ex "break BtStartKern"            \

ddd: all installonimage
	@setsid qemu-system-x86_64 -m $(ram) -enable-kvm -rtc base=localtime \
	 -hda $(installdisk) -no-reboot -no-shutdown -d \
	 cpu_reset,guest_errors,pcall,int -s -S 2> $(BUILDDIR)/qemu.log &
	@ddd -n

gdbnokvm: all installonimage
	@setsid qemu-system-x86_64 -m $(ram) -rtc base=localtime \
	 -hda $(installdisk) -no-reboot -no-shutdown -d \
	 cpu_reset,guest_errors,pcall,int -s -S 2> $(BUILDDIR)/qemu.log &
	@gdb \
	-ex "set arch i386:x86-64:intel"   \
	-ex "target remote localhost:1234" \
	-ex "symbol-file $(BINDIR)/kaleid" \
	-ex "break BtStartKern"            \

dddnokvm: all installonimage
	@setsid qemu-system-x86_64 -m $(ram) -rtc base=localtime \
	 -hda $(installdisk) -no-reboot -no-shutdown -d \
	 cpu_reset,guest_errors,pcall,int -s -S 2> $(BUILDDIR)/qemu.log &
	@ddd -n


## HD IMAGE RELATED ---------------------------------------------------------- #

installonimage: $(installdisk) $(MBRDIR)/grub.cfg
	@echo ${CL2}[$@] ${NC}Installing boot configuration on image...${CL3}
	@$(BUILDDIR)/install-os-k.sh $(installdisk) $(MBRDIR)/grub.cfg $(BINDIR)/kaleid
	@echo ${CL2}[$@] ${CL}Success.${CL3}

$(installdisk): $(BUILDDIR)/create_disk.sh
	@echo ${CL2}[$@]${NC} Constructing disk image $@...${CL3}
	@mkdir -p $(shell dirname $@)
	@$(BUILDDIR)/create_disk.sh $(installdisk)
	@echo ${CL2}[$@]${NC} Constructing disk image...${CL3}


## CLEANUP RELATED ----------------------------------------------------------- #

dust:
	@rm -Rf $(OBJDIR)/*
	@echo ${CL2}[$@] ${CL}Cleaned.${CL3}

clean:
	@rm -Rvf ./ProjectTree $(BUILDDIR)/*.log
	@rm -Rvf $(BINDIR) $(OBJDIR)
	@echo ${CL2}[$@] ${CL}Cleaned.${CL3}

update-cross-cc:
	@rm -rf cross-cc
	@echo ${CL2}[$@] ${CL}Ready to update.${CL3}