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DEFAULT_HOST:=i686-elf
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HOST?=DEFAULT_HOST
HOSTARCH:=i386
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CFLAGS?= -O2 -g
CPPFLAGS?=
LDFLAGS?=
LIBS?=
DESTDIR?=
PREFIX?=/usr/local
EXEC_PREFIX?=$(PREFIX)
BOOTDIR?=$(EXEC_PREFIX)/boot
INCLUDEDIR?=$(PREFIX)/include
CFLAGS:=$(CFLAGS) -ffreestanding -Wall -Wextra
CPPFLAGS:=$(CPPFLAGS) -D__is_kernel -Iinclude
LDFLAGS:=$(LDFLAGS)
LIBS:=$(LIBS) -nostdlib -lgcc
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ARCHDIR=arch/$(HOSTARCH)
include $(ARCHDIR)/make.config
CFLAGS:=$(CFLAGS) $(KERNEL_ARCH_CFLAGS)
CPPFLAGS:=$(CPPFLAGS) $(KERNEL_ARCH_CPPFLAGS)
LDFLAGS:=$(LDFLAGS) $(KERNEL_ARCH_LDFLAGS)
LIBS:=$(LIBS) $(KERNEL_ARCH_LIBS)
KERNEL_OBJS= \
$(KERNEL_ARCH_OBJS) \
kernel/utils.o \
kernel/kernel.o
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OBJS=\
$(ARCHDIR)/crti.o \
$(ARCHDIR)/crtbegin.o \
$(KERNEL_OBJS) \
$(ARCHDIR)/crtend.o \
$(ARCHDIR)/crtn.o
LINK_LIST=\
$(LDFLAGS) \
$(ARCHDIR)/crti.o \
$(ARCHDIR)/crtbegin.o \
$(KERNEL_OBJS) \
$(LIBS) \
$(ARCHDIR)/crtend.o \
$(ARCHDIR)/crtn.o
.PHONY: all clean install install-headers install-kernel
.SUFFIXES: .o .c .s
all: red.kernel
red.kernel: $(OBJS) $(ARCHDIR)/linker.ld
$(CC) -T $(ARCHDIR)/linker.ld -o $@ $(CFLAGS) $(LINK_LIST)
$(ARCHDIR)/crtbegin.o $(ARCHDIR)/crtend.o:
OBJ=`$(CC) $(CFLAGS) $(LDFLAGS) -print-file-name=$(@F)` && cp "$$OBJ" $@
.c.o:
$(CC) -MD -c $< -o $@ -std=gnu11 $(CFLAGS) $(CPPFLAGS)
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.s.o:
$(CC) -MD -c $< -o $@ $(CFLAGS) $(CPPFLAGS)
clean:
rm -f red.kernel
rm -f $(OBJS) *.o */*.o */*/*.o
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rm -f $(OBJS:.o=.d) *.d */*.d */*/*.d
install: install-headers install-kernel gen-iso
install-headers:
mkdir -p $(DESTDIR)$(INCLUDEDIR)
cp -R --preserve=timestamps include/. $(DESTDIR)$(INCLUDEDIR)/.
install-kernel: red.kernel
mkdir -p $(DESTDIR)$(BOOTDIR)
cp red.kernel $(DESTDIR)$(BOOTDIR)
gen-iso:
rm -f red.iso \
cp red.kernel iso/boot/kernel.elf \
genisoimage -R\
-b boot/grub/stage2_eltorito\
-no-emul-boot\
-A ProjectRED\
-input-charset utf8\
-quiet
-boot-info-table\
-o red.iso\
iso
-include $(OBJS:.o=.d)