# -*- makefile -*-

include ../Makefile.vars

SHELL = /bin/sh

# Binary utilities.
# If the host appears to be x86, use the normal tools.
# Otherwise assume cross-tools are installed as i386-elf-*.
X86 = i.86\|pentium.*\|[pk][56]\|nexgen\|viac3\|6x86\|athlon.*
ifneq (0, $(shell expr `uname -m` : '$(X86)'))
CC = gcc
LD = ld
OBJCOPY = objcopy
else
CC = i386-elf-gcc
LD = i386-elf-ld
OBJCOPY = i386-elf-objcopy
endif

# Other utilities.
DD = dd
RM = rm
CAT = cat

VPATH = ../..

# Compiler and assembler options.
DEFINES += -DKERNEL
WARNINGS = -Wall -W -Wstrict-prototypes -Wmissing-prototypes
CPPFLAGS = -nostdinc -I../.. -I- -I../../lib -I../../lib/kernel	\
	   -include constants.h
CFLAGS = -g -O3 -MMD -msoft-float 
ASFLAGS = -Wa,--gstabs -MMD

# Core kernel.
threads_SRC  = threads/init.c		# Main program.
threads_SRC += threads/thread.c		# Thread management core.
threads_SRC += threads/switch.S		# Thread switch routine.
threads_SRC += threads/interrupt.c	# Interrupt core.
threads_SRC += threads/intr-stubs.S	# Interrupt stubs.
threads_SRC += threads/synch.c		# Synchronization.
threads_SRC += threads/palloc.c		# Page allocator.
threads_SRC += threads/malloc.c		# Subpage allocator.
threads_SRC += threads/start.S		# Startup code.
threads_SRC += threads/test.c		# Test code.

# Device driver code.
devices_SRC  = devices/timer.c		# Timer device.
devices_SRC += devices/kbd.c		# Keyboard device.
devices_SRC += devices/vga.c		# Video device.
devices_SRC += devices/serial.c		# Serial port device.
devices_SRC += devices/disk.c		# IDE disk device.
devices_SRC += devices/intq.c		# Interrupt queue.

# Library code shared between kernel and user programs.
lib_SRC  = lib/debug.c		# Debug helpers.
lib_SRC += lib/random.c		# Pseudo-random numbers.
lib_SRC += lib/stdio.c		# I/O library.
lib_SRC += lib/stdlib.c		# Utility functions.
lib_SRC += lib/string.c		# String functions.

# Kernel-specific library code.
lib_kernel_SRC += lib/kernel/list.c	# Doubly-linked lists.
lib_kernel_SRC += lib/kernel/bitmap.c	# Bitmaps.
lib_kernel_SRC += lib/kernel/hash.c	# Hash tables.
lib_kernel_SRC += lib/kernel/console.c	# printf(), putchar().

# Filesystem code.
filesys_SRC  = filesys/filesys.c	# Filesystem core.
filesys_SRC += filesys/file.c		# Files.
filesys_SRC += filesys/directory.c	# Directories.
filesys_SRC += filesys/inode.c		# File headers.
filesys_SRC += filesys/fsutil.c		# Utilities.

# User process code.
userprog_SRC  = userprog/addrspace.c	# Address spaces.
userprog_SRC += userprog/pagedir.c	# Page directories.
userprog_SRC += userprog/exception.c	# User exception handler.
userprog_SRC += userprog/syscall.c	# System call handler.
userprog_SRC += userprog/gdt.c		# GDT initialization.
userprog_SRC += userprog/tss.c		# TSS management.

SOURCES = $(foreach dir,$(SUBDIRS),$($(subst /,_,$(dir))_SRC))
OBJECTS = $(patsubst %.c,%.o,$(patsubst %.S,%.o,$(SOURCES)))
DEPENDS = $(patsubst %.o,%.d,$(OBJECTS))

all: os.dsk

threads/intr-stubs.S: threads/intr-stubs.pl threads/loader.h
	$< > $@

threads/kernel.lds.s: CPPFLAGS += -P -C
threads/kernel.lds.s: threads/kernel.lds.S threads/loader.h

kernel.o: threads/kernel.lds.s $(OBJECTS) 
	$(LD) -T $< -o $@ $(OBJECTS) `$(CC) -print-libgcc-file-name`

kernel.bin: kernel.o
	$(OBJCOPY) -O binary -R .note -R .comment -S $< $@.tmp
	$(DD) if=$@.tmp of=$@ bs=4096 conv=sync
	$(RM) $@.tmp

threads/loader.o: threads/loader.S kernel.bin
	$(CC) -c $< -o $@ $(ASFLAGS) $(CPPFLAGS) $(DEFINES) -DKERNEL_LOAD_PAGES=`perl -e 'print +(-s "kernel.bin") / 4096;'`

loader.bin: threads/loader.o
	$(LD) -N -e start -Ttext 0x7c00 --oformat binary -o $@ $<

os.dsk: loader.bin kernel.bin
	$(CAT) $^ > $@

clean:
	$(RM) -f $(OBJECTS) $(DEPENDS) 
	$(RM) -f threads/intr-stubs.S threads/loader.o
	$(RM) -f kernel.o kernel.lds.s
	$(RM) -f kernel.bin loader.bin

Makefile: ../../Makefile.build
	cp $< $@

%.o: %.c
	$(CC) -c $< -o $@ $(CFLAGS) $(CPPFLAGS) $(WARNINGS) $(DEFINES)

%.o: %.S
	$(CC) -c $< -o $@ $(ASFLAGS) $(CPPFLAGS) $(DEFINES)

-include $(DEPENDS)