makefile

Fast and transparent file system and swap encryption package for linux. No source code changes to li

#
#  Makefile
#
#  Written by Jari Ruusu, June 13 2007
#
#  Copyright 2001-2007 by Jari Ruusu.
#  Redistribution of this file is permitted under the GNU Public License.
#
#  To compile and install, use commands:  make clean; make
#  This Makefile tries to locate running kernel source directory and
#  steal definitions from kernel Makefile. Note: kernel must be properly
#  configured and compiled in order for this to work.
#  You can override the kernel source directory by defining LINUX_SOURCE
#  like this:  make LINUX_SOURCE=/usr/src/linux-2.2.20aa1
#
#  Both LINUX_SOURCE and KBUILD_OUTPUT must be defined when
#  compiling for 2.6.x kernel with separate object directory.
#

KR:=$(shell uname -r)
ifdef LINUX_SOURCE
	LS:=$(LINUX_SOURCE)
else
	LS:=$(shell  if [ -f /lib/modules/$(KR)/source/Makefile ]; then cd /lib/modules/$(KR)/source && /bin/pwd; \
		else if [ -f /lib/modules/$(KR)/build/include/linux/version.h ]; then cd /lib/modules/$(KR)/build && /bin/pwd; \
		else if [ -f /usr/src/linux/include/linux/version.h ]; then cd /usr/src/linux && /bin/pwd; \
		else if [ -f /usr/src/linux-$(KR)/include/linux/version.h ]; then cd /usr/src/linux-$(KR) && /bin/pwd; \
		else if [ -f /usr/src/kernel-source-$(KR)/include/linux/version.h ]; then cd /usr/src/kernel-source-$(KR) && /bin/pwd; \
		else echo unable-to-guess-source-dir; fi; fi; fi; fi; fi)
endif
ifdef KBUILD_OUTPUT
	OD1:=$(KBUILD_OUTPUT)
else
ifdef LINUX_SOURCE
	OD1:=$(LS)
else
	OD1:=$(shell if [ -f /lib/modules/$(KR)/build/include/linux/version.h ]; then cd /lib/modules/$(KR)/build && /bin/pwd; else echo $(LS); fi)
endif
endif
OD2:=
ifneq ($(LS),$(OD1))
	OD2:= O=$(OD1)
endif
TD:=$(shell /bin/pwd)

MODINST:=y
KEYSCRUB:=n
PADLOCK:=n
BUILD_LOOP:=y
EXTRA_CIPHERS:=n

VERSION:=$(shell if test -r $(LS)/Makefile; then grep '^VERSION' $(LS)/Makefile | head -n 1 | sed -e 's/[^0-9]//g'; fi)
PATCHLEVEL:=$(shell if test -r $(LS)/Makefile; then grep '^PATCHLEVEL' $(LS)/Makefile | head -n 1 | sed -e 's/[^0-9]//g'; fi)
SUBLEVEL:=$(shell if test -r $(LS)/Makefile; then grep '^SUBLEVEL' $(LS)/Makefile | head -n 1 | sed -e 's/[^0-9]//g'; fi)

PATCHNAME:=loop.c-$(VERSION).$(PATCHLEVEL).diff
ORIGNAME:=loop.c-$(VERSION).$(PATCHLEVEL).original
PREPATCHED:=loop.c-$(VERSION).$(PATCHLEVEL).patched

EF:=
LF:=-r
ifeq ($(shell if [ "$(VERSION)$(PATCHLEVEL)0" -lt 260 ]; then echo y; fi),y)
	OD1:=$(LS)
endif

ifeq ($(VERSION).$(PATCHLEVEL),2.0)
	# Use optimized assembler implementation if target is x86 processor
	X86_ASM:=$(shell if grep -q -s "define CONFIG_M[3456]86" $(LS)/include/linux/autoconf.h; then echo y; fi)
	# kernel v2.0 doesn't have u_int32_t and u_int64_t
	EF += -Du_int32_t=__u32 -Du_int64_t=__u64
ifndef KERNELRELEASE
	# some older 2.0 kernels don't define KERNELRELEASE
	KERNELRELEASE:=$(VERSION).$(PATCHLEVEL).$(SUBLEVEL)
endif
endif
ifeq ($(VERSION).$(PATCHLEVEL),2.2)
	# Use optimized assembler implementation if target is x86 processor
	X86_ASM:=$(shell if grep -q -s "define CONFIG_M[3456]86" $(LS)/include/linux/autoconf.h; then echo y; fi)
endif
ifeq ($(VERSION).$(PATCHLEVEL),2.4)
	EF += $(kbuild_2_4_nostdinc)
	# Use optimized assembler implementation if target is x86 processor
	X86_ASM:=$(shell if grep -q -s "define CONFIG_X86 1" $(LS)/include/linux/autoconf.h; then if ! grep -q -s "define CONFIG_X86_64" $(LS)/include/linux/autoconf.h; then echo y; fi; fi)
	# Use optimized assembler implementation if target is AMD64 or compatible processor
	AMD64_ASM:=$(shell if grep -q -s "define CONFIG_X86_64" $(LS)/include/linux/autoconf.h; then echo y; fi)
	# some older 2.4 kernels don't have struct block_device_operations.owner
	EF += $(shell if test -r $(LS)/include/linux/fs.h; then if ! sed -e '1,/^struct block_device_operations {$$/ d' $(LS)/include/linux/fs.h | sed -e '/^};$$/,$$ d' | grep -q -s 'struct module.*owner;'; then echo "-DNO_BLOCK_DEVICE_OPERATIONS_OWNER"; fi; fi)
	# some older 2.4 kernels don't have reparent_to_init()
	EF += $(shell if ! grep -q -s "extern void reparent_to_init" $(LS)/include/linux/sched.h; then echo "-DNO_REPARENT_TO_INIT"; fi)
	# some 2.4 kernels don't have struct task_struct.sigmask_lock
	EF += $(shell if ! grep -q -s "spinlock_t sigmask_lock" $(LS)/include/linux/sched.h; then if grep -q -s 'struct sighand_struct \*sighand;' $(LS)/include/linux/sched.h; then echo '-DNO_TASK_STRUCT_SIGMASK_LOCK=1'; else echo '-DNO_TASK_STRUCT_SIGMASK_LOCK=2'; fi; fi)
endif
ifeq ($(shell if [ "$(VERSION)$(PATCHLEVEL)0" -ge 260 ]; then echo y; fi),y)
	# Use optimized assembler implementation if target is x86 processor
	X86_ASM:=$(shell if grep -q -s "define CONFIG_X86 1" $(OD1)/include/linux/autoconf.h; then if ! grep -q -s "define CONFIG_X86_64" $(OD1)/include/linux/autoconf.h; then echo y; fi; fi)
	# Use optimized assembler implementation if target is AMD64 or compatible processor
	AMD64_ASM:=$(shell if grep -q -s "define CONFIG_X86_64" $(OD1)/include/linux/autoconf.h; then echo y; fi)
	# some older 2.6 kernels have different request_module interface
	EF += $(shell if test -r $(LS)/drivers/block/genhd.c; then if ! grep -q -s "request_module.*block-major-.*MAJOR.*MINOR" $(LS)/drivers/block/genhd.c; then echo "-DOLD_REQUEST_MODULE_INTERFACE"; fi; fi)
	# some older 2.6 kernels have per thread resource limits
	EF += $(shell if test -r $(LS)/include/linux/sched.h; then if sed -e '1,/^struct task_struct {$$/ d' $(LS)/include/linux/sched.h | sed -e '/^};$$/,$$ d' | grep -q -s 'struct rlimit rlim.RLIM_NLIMITS.;'; then echo "-DOLD_PER_THREAD_RLIMITS"; fi; fi)
	# some 2.6 kernels may have void* timer callback parameter
	EF += $(shell if test -r $(LS)/include/linux/timer.h; then if ! sed -e '1,/^struct timer_list {$$/ d' $(LS)/include/linux/timer.h | sed -e '/^};$$/,$$ d' | grep -q -s 'unsigned long data;'; then echo "-DNEW_TIMER_VOID_PTR_PARAM"; fi; fi)
	# some older 2.6 kernels may have two invalidate_bdev() parameters
	EF += $(shell if test -r $(LS)/include/linux/buffer_head.h; then if grep -q -s '^void invalidate_bdev.*struct block_device.*int' $(LS)/include/linux/buffer_head.h; then echo "-DOLD_INVALIDATE_BDEV_INTERFACE"; fi; fi)
endif

ifeq ($(KEYSCRUB),y)
ifeq ($(shell if [ "$(VERSION)$(PATCHLEVEL)0" -ge 240 ]; then echo y; fi),y)
	EF += -DCONFIG_BLK_DEV_LOOP_KEYSCRUB=1
endif
endif

ifeq ($(PADLOCK),y)
ifeq ($(shell if [ "$(VERSION)$(PATCHLEVEL)0" -ge 240 ]; then echo y; fi),y)
	EF += -DCONFIG_BLK_DEV_LOOP_PADLOCK=1
endif
endif

# Some distros include "" characters in KERNELRELEASE string
KERNELRELEASE_clean:=$(shell echo $(KERNELRELEASE))

AES_OBJ_CODE:=aes.o
MD5_OBJ_CODE:=md5.o
ifeq ($(X86_ASM),y)
	AES_OBJ_CODE:=aes-x86.o
	MD5_OBJ_CODE:=md5-x86.o
	EF += -DX86_ASM
endif
ifeq ($(AMD64_ASM),y)
	AES_OBJ_CODE:=aes-amd64.o
	MD5_OBJ_CODE:=md5-amd64.o
	EF += -DAMD64_ASM
endif

# check if depmod supports -F and -b options
ifeq ($(shell if [ "$(VERSION)$(PATCHLEVEL)0" -ge 260 ]; then echo y; fi),y)
	DMOK:=y
else
	DMOK:=$(shell if [ `/sbin/insmod -V 2>&1 | head -n 1 | awk '/^insmod version /{split($$3, a, /\./); printf "%d%03d%03d\n", a[1], a[2], a[3];}'`0 -ge 20020020 ]; then echo y; fi)
endif
ifndef DEPMOD
	DEPMOD:=/sbin/depmod
endif

# check if kernel source has System.map
SYSM:=$(shell if [ -r $(OD1)/System.map ]; then echo y; fi)

RUNDM:=
DMOPTS:=
ifeq ($(DMOK),y)
ifneq "$(strip $(INSTALL_MOD_PATH))" ""
	DMOPTS += -b $(INSTALL_MOD_PATH)
endif
ifeq ($(SYSM),y)
	RUNDM:=y
	DMOPTS += -F $(OD1)/System.map $(KERNELRELEASE_clean)
endif
endif
ifeq ($(KERNELRELEASE_clean),$(KR))
ifeq "$(strip $(INSTALL_MOD_PATH))" ""
	RUNDM:=y
endif
endif

all:
ifeq ($(LS),unable-to-guess-source-dir)
	@echo "Unable to guess linux kernel source directory. Please specify"
	@echo "directory like this:  make LINUX_SOURCE=/usr/src/linux-2.2.20aa1"
	@exit 1
endif
ifeq ($(shell if [ "$(VERSION)$(PATCHLEVEL)0" -ge 260 ]; then echo y; fi),y)
	rm -r -f *.ko tmp-d-kbuild 
	mkdir tmp-d-kbuild
	echo 'obj-m:=' >>tmp-d-kbuild/Makefile
ifeq ($(BUILD_LOOP),y)
	cd tmp-d-kbuild && ln -s ../loop.c-$(VERSION).$(PATCHLEVEL).patched patched-loop.c && ln -s ../glue.c ../aes.h ../md5.h .
	echo 'obj-m += loop.o' >>tmp-d-kbuild/Makefile
ifeq ($(X86_ASM),y)
	cd tmp-d-kbuild && ln -s ../aes-x86.S ../md5-x86.S .
	echo 'loop-y:=patched-loop.o glue.o aes-x86.o md5-x86.o' >>tmp-d-kbuild/Makefile
else
ifeq ($(AMD64_ASM),y)
	cd tmp-d-kbuild && ln -s ../aes-amd64.S ../md5-amd64.S .
	echo 'loop-y:=patched-loop.o glue.o aes-amd64.o md5-amd64.o' >>tmp-d-kbuild/Makefile
else
	cd tmp-d-kbuild && ln -s ../aes.c ../md5.c .
	echo 'loop-y:=patched-loop.o glue.o aes.o md5.o' >>tmp-d-kbuild/Makefile
	echo 'CFLAGS_aes.o := -DDATA_ALWAYS_ALIGNED=1' >>tmp-d-kbuild/Makefile
endif
endif
endif
ifeq ($(EXTRA_CIPHERS),y)
	cd tmp-d-kbuild && ln -s ../loop_twofish.c ../loop_serpent.c ../loop_blowfish.c .
	echo 'obj-m += loop_twofish.o loop_serpent.o loop_blowfish.o' >>tmp-d-kbuild/Makefile
endif
	echo 'EXTRA_CFLAGS:= $(EF)' >>tmp-d-kbuild/Makefile
	cd $(LS) && make SUBDIRS=$(TD)/tmp-d-kbuild modules $(OD2)
ifeq ($(MODINST),y)