Initial commit. We have a booting kernel

kernel/Makefile

@@ -0,0 +1,83 @@
+DEFAULT_HOST!=../default-host.sh
+HOST?=DEFAULT_HOST
+HOSTARCH!=../target-triplet-to-arch.sh $(HOST)
+ 
+CFLAGS?=-O2 -g
+CPPFLAGS?=
+LDFLAGS?=
+LIBS?=
+ 
+DESTDIR?=
+PREFIX?=/usr/local
+EXEC_PREFIX?=$(PREFIX)
+BOOTDIR?=$(EXEC_PREFIX)/boot
+INCLUDEDIR?=$(PREFIX)/include
+ 
+CFLAGS:=$(CFLAGS) -ffreestanding -Wall -Wextra
+CPPFLAGS:=$(CPPFLAGS) -D__is_kernel -Iinclude
+LDFLAGS:=$(LDFLAGS)
+LIBS:=$(LIBS) -nostdlib -lk -lgcc
+ 
+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/kernel.o \
+ 
+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 .cpp .S
+ 
+all: banan-os.kernel
+ 
+banan-os.kernel: $(OBJS) $(ARCHDIR)/linker.ld
+	$(CC) -T $(ARCHDIR)/linker.ld -o $@ $(CFLAGS) $(LINK_LIST)
+	grub-file --is-x86-multiboot banan-os.kernel
+ 
+$(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)
+ 
+.S.o:
+	$(CC) -MD -c $< -o $@ $(CFLAGS) $(CPPFLAGS)
+ 
+clean:
+	rm -f banan-os.kernel
+	rm -f $(OBJS) *.o */*.o */*/*.o
+	rm -f $(OBJS:.o=.d) *.d */*.d */*/*.d
+ 
+install: install-headers install-kernel
+ 
+install-headers:
+	mkdir -p $(DESTDIR)$(INCLUDEDIR)
+	cp -R --preserve=timestamps include/. $(DESTDIR)$(INCLUDEDIR)/.
+ 
+install-kernel: banan-os.kernel
+	mkdir -p $(DESTDIR)$(BOOTDIR)
+	cp banan-os.kernel $(DESTDIR)$(BOOTDIR)
+ 
+-include $(OBJS:.o=.d)