#----------------------------------------------------------------------------#
#                           GNU GPL OS/K                                     #
#                                                                            #
#  Authors:    spectral`                                                     #
#              NeoX                                                          #
#                                                                            #
#  Desc:       Project Makefile                                              #
#----------------------------------------------------------------------------#

CCNAME="/opt/cross-cc/bin/x86_64-elf-gcc"
CWARNS=-Wall -Wextra -Werror -pedantic
CLDSCR=-T kernel.ld
CFLAGS=-nostdlib -ffreestanding -mcmodel=large -mno-red-zone -mno-mmx -mno-sse -mno-sse2
CINCLUDES=-I./kaleid
CDEFINES=

CC=$(CCNAME) $(CWARNS) $(CLDSCR) $(CFLAGS) $(CDEFINES) $(CINCLUDES)

ASM=nasm
ASMFLAGS=
BOOTFLAGS=-f bin

BINDIR=../bin
OBJDIR=../obj

BOOTDIR=boot
COMMDIR=kaleid/common
KERNDIR=kaleid/kernel
SYSTDIR=kaleid/system

all: bootloader

boot.mbr.s: $(BOOTDIR)/mbr.s $(BOOTDIR)/mbr.inc
	$(ASM) $(BOOTFLAGS) $(BOOTDIR)/mbr.s -o $(OBJDIR)/boot/mbr.bin

boot.loader.s: $(BOOTDIR)/loader.s
	$(ASM) $(BOOTFLAGS) $(BOOTDIR)/loader.s -o $(OBJDIR)/boot/loader.bin

bootloader: boot.mbr.s boot.loader.s
	cp $(OBJDIR)/boot/mbr.bin $(BINDIR)/mbr.bin
	cp $(OBJDIR)/boot/loader.bin $(BINDIR)/loader.bin
    
#----------------------------------------------------------------------------#
# TESTING MAKEFILE

pseudo_kern:
	$(ASM) $(BOOTFLAGS) $(BOOTDIR)/pseudo_kernel.s -o $(OBJDIR)/boot/pkernel.bin

testing: bootloader pseudo_kern
	cat $(BINDIR)/bootloader.bin $(OBJDIR)/boot/pkernel.bin > $(BINDIR)/boot.bin

#----------------------------------------------------------------------------#
# COMMON MAKEFILE

COBJDIR=$(OBJDIR)/$(COMMDIR)

COMMDEPS=$(COMMDIR)/common.h $(COMMDIR)/assert.h $(COMMDIR)/atomic.h $(COMMDIR)/config.h \
			$(COMMDIR)/status.h

COBJECTS=$(COBJDIR)/lib/string.o

common: common.lib.string.c $(COMMDEPS)

common.lib.string.c: $(COMMDIR)/lib/string.c $(COMMDEPS)
	$(CC) -c $(COMMDIR)/lib/string.c -o $(OBJDIR)/$(COMMDIR)/lib/string.o

#----------------------------------------------------------------------------#
# KERNEL MAKEFILE

KOBJDIR=$(OBJDIR)/$(KERNDIR)

KERNDEPS=$(COMMDEPS) $(KERNDIR)/init.h $(KERNDIR)/io/terminal.h $(KERNDIR)/io/ports.h

kernel: common kernel.io.terminal.c kernel.init.c kernel.io.ports.c
	$(CC) -o $(BINDIR)/kaleid-kernel.elf \
			$(COBJECTS) $(KOBJDIR)/init.o \
			$(KOBJDIR)/io/terminal.o $(KOBJDIR)/io/ports.o


kernel.init.c: $(KERNDIR)/init.c $(KERNDEPS)
	$(CC) -c $(KERNDIR)/init.c -o $(KOBJDIR)/init.o

kernel.io.ports.c: $(KERNDIR)/io/ports.c $(KERNDEPS)
	$(CC) -c $(KERNDIR)/io/ports.c -o $(KOBJDIR)/io/ports.o

kernel.io.terminal.c: $(KERNDIR)/io/terminal.c $(KERNDEPS)
	$(CC) -c $(KERNDIR)/io/terminal.c -o $(KOBJDIR)/io/terminal.o