/* $Id: Imakefile,v 1.122.2.10 2006/10/25 18:34:21 mcnabb Exp $ */

/***** THIS MUST BE INCLUDED WITH IMAKE FILES *****/
/* Only include kernel and cxi headers in this layer */
SetGplIncludePath()
/***** THIS MUST BE INCLUDED WITH IMAKE FILES *****/

CheckLinuxDistribution()

PTHREADS = -lpthread
INSTROOTFLAGS = -c -m 0500

#if (LINUX_KERNEL_VERSION >= 2060000)
/*
 * The linux 2.6 kernel adds a new component called "modpost", to all the
 * kernel modules. Typically, this is done automatically by the linux kernel
 * build infrastructure (kbuild). But the kbuild infrastructure is quite cryptic
 * to be used by modules like GPFS. Hence, we bypass the linux kbuild
 * infrastructure and do the modpost work ourselves.
 * 
 * Here is the summary of what we do:
 * If the ".c" file exports a function to the linux kernel then we add the
 * CRC of all such functions to the object. This is done to detect version
 * mismatch between modules/kernel.
 * If a ".c" file exports a function, then its object would have a "__ksymtab"
 * section.
 * For all such ".c" files, we recompile it with -E -D__GENKSYMS__ defined and
 * feed the output to "genksyms" program, which calculates the CRC for all
 * such functions. We then put this information into the object file so that
 * the corresponding modpost file contains the CRCs required for the module.
 * (The modpost work is done in the Imakefile for the "gpl-linux" directory.)
 */
OBJDUMP = /usr/bin/objdump
GENKSYMS = $(KERNEL_BUILD_DIR)/scripts/genksyms/genksyms
handle_linux_sym = @if [ ! -f $(GENKSYMS) ]; then \ @@\
	              echo "$(GENKSYMS) not found. Check the value of KERNEL_BUILD_DIR in site.mcr";\ @@\
		      exit 1; \ @@\
	           fi;	\ @@\
		   $(OBJDUMP) -h $1 | grep -q  __ksymtab; 	      \	@@\
	           if [ $$? -eq 0 ]; then 			              \ @@\
		      $(C_COMP) -E -D__GENKSYMS__ $(KCFLAGS) $2 | $(GENKSYMS) > $1.ver;    \	@@\
	              mv $1 $1.tmp;					      \	@@\
		      $(BARELD) -r -o $1 $1.tmp -T $1.ver;      \ @@\
		      rm -f $1.tmp;				      \ @@\
	           fi
#endif /* LINUX_KERNEL_VERSION */


#if (LINUX_KERNEL_VERSION >= 2060000)
#ifdef LinuxKernelObjectRule
#undef LinuxKernelObjectRule
#define LinuxKernelObjectRule()				@@\
.c.ko:                                                  @@\
	$(RM) $@                                        @@\
	$(C_COMP) -o $@ -c $(KCFLAGS) $*.c              @@\
	$(call handle_linux_sym,$@,$*.c)
#endif /* LinuxKernelObjectRule */
#endif /* LINUX_KERNEL_VERSION */

NormalObjectRule()

#define IHaveSubdirs
#ifdef GPFS_ARCH_POWER
SUBDIRS = power
#endif
#ifdef GPFS_ARCH_I386
#undef i386
SUBDIRS = i386
#endif
#ifdef GPFS_ARCH_IA64
SUBDIRS = "ia64"
#endif
#ifdef GPFS_ARCH_PPC64
SUBDIRS = ppc64
#endif
#ifdef GPFS_ARCH_X86_64
SUBDIRS = x86_64
#endif

#ifdef GPFS_ARCH_POWER
STD_KINCLUDES += -I$(KERNEL_HEADER_DIR)/../arch/ppc
#endif

#ifdef GPFS_ARCH_I386
STD_KINCLUDES += -I$(KERNEL_HEADER_DIR)/../arch/$(SUBDIRS)/mach-generic \
                -I$(KERNEL_HEADER_DIR)/asm-$(SUBDIRS)/mach-default
#endif

#if (LINUX_KERNEL_VERSION > 2060000) 
KCFLAGS += $(shell $(DESTDIR)/bin/getupdatelevel)
#endif

#if (LINUX_KERNEL_VERSION >= 2061600)
comma = ,
name-fix = $(subst $(comma),_,$(subst -,_,$1))
basename_flags = -D"KBUILD_BASENAME=KBUILD_STR($(call name-fix,$(*F)))"
KCFLAGS += -D"KBUILD_STR(s)=\#s" $(basename_flags)
#if (LINUX_KERNEL_VERSION >= 2061900)
STD_KINCLUDES += -include $(KERNEL_HEADER_DIR)/linux/autoconf.h
#endif
#endif

HEADERS = Shark-gpl.h prelinux.h postlinux.h linux2gpfs.h verdep.h \
          Logger-gpl.h arch-gpl.h 
#ifdef SMB_LOCKS
HEADERS += oplock.h
#endif

LINUX_VFS = opsdeclare.ko gpl-ksyms.ko \
            gplInit.ko block.ko file.ko inode.ko dir.ko \
            super.ko cxiSystem.ko cxiVFSStats.ko cxiIOBuffer.ko \
            kx.ko mmap.ko ss.ko acl.ko

LINUX_CUSTOM = cfiles_cust.ko

#if defined(GPFS_ARCH_I386) && (LINUX_KERNEL_VERSION > 2060500) && !defined(NOKREGPARMS)
MMLDFLAGS  += --wrap __divdi3 --wrap __udivdi3 --wrap __moddi3 --wrap __umoddi3
MMFS = mmfs-i386r
/* kdump must have regparms turned off */
KDUMPCFLAGS = $(KCFLAGS) -mregparm=0
#else
#if defined(GPFS_ARCH_IA64) && (LINUX_KERNEL_VERSION > 2060500)
/* Need to include additional code sections with ia64 2.6 kernel modules */
MMLDFLAGS = -T /usr/src/linux/arch/ia64/module.lds
#else
MMLDFLAGS =
#endif
MMFS = mmfs
KDUMPCFLAGS = $(KCFLAGS)
#endif
#if defined(GPFS_ARCH_PPC64) && (LINUX_KERNEL_VERSION > 2060900) 
MMFS = mmfs-ppc64-rh4
#endif

#if (LINUX_KERNEL_VERSION > 2060000)

/*
 * The default value for KERNEL_BUILD_DIR in site.mcr contains backquotes, 
 * which the "make" does not understand. So, we call the shell to expand it
 */ 
KERNEL_BUILD_DIR := $(call shell, echo "$(KERNEL_BUILD_DIR)")
#ifdef PCE_26_PCE
MODPOST := $(KERNEL_BUILD_DIR)/scripts/mod/modpost
#else
MODPOST := $(if $(wildcard $(KERNEL_BUILD_DIR)/scripts/mod/modpost), \
          $(KERNEL_BUILD_DIR)/scripts/mod/modpost, \
	            $(KERNEL_BUILD_DIR)/scripts/modpost)
#endif

SYSVERFILE := $(KERNEL_BUILD_DIR)/Module.symvers

ifeq ($(LINUX_DISTRIBUTION), REDHAT_AS_LINUX)
        MODPOST_FLAG := -m
else
/* The modpost program on SLES9 does not recognize '-m' flag. The modversioning 
   seems to be turned on by default. But on SLES10, this program requires the 
   '-m' flag.
*/
#if (LINUX_KERNEL_VERSION >= 2061600)
        MODPOST_FLAG := -m
#else
        MODPOST_FLAG :=
#endif
endif

#if (LINUX_KERNEL_VERSION >= 2061600 )
gpfs_module_name = -DKBUILD_MODNAME=\"$1\"
#else
gpfs_module_name = -DKBUILD_MODNAME=$1
#endif

/*
 * For Linux kernel 2.6, we handle the modpost work ourselves. This way, we can
 * use the kernel modversioning to detect module/kernel mismatch.
 * To achieve this we do the folloing things:
 * (1) Recompile all the ".c" files which export functions to the linux kernel.
 *     - the ".c" files are recompiled with -E -D__GENKSYMS__ and its output is
 *       is feeded to the "genksyms" program, which calculates the CRC for 
 *       the function signature (for MODVERSION).
 *       This part is done in the "imake.tmpl" file. 
 * (2) Inovke the "modpost" script to generate "tracedev.mod.c" and
 *     "mmfslinux.mod.c" files and relinking it to the corresponding module.
 *
 * Note that for mmfs26 module, we continue to use the modpost.c file in the
 * gpl-linux directory.  
 */


#ifdef PCE_26_PCE
/*
 * Experimental:
 * 2.6.16 code seems to want the module name quoted in order to compile.
 */
handle_modpost = @if [ ! -f $(MODPOST) ] ; then \ @@\
		    echo "$(MODPOST) not found. Check the value of \ @@\
		          KERNEL_BUILD_DIR in site.mcr file."; \ @@\
		    exit 1;  \  @@\
                 fi; \ @@\
                 $(MODPOST) $(MODPOST_FLAG) -i $2 -o $1.symvers $(PWD)/$1 ;	\ @@\
		 $(C_COMP) -o $1.mod.o -c $(KCFLAGS) -DKBUILD_MODNAME=\"$1\" $1.mod.c
#else
handle_modpost = @if [ ! -f $(MODPOST) ] ; then \ @@\
		    echo "$(MODPOST) not found. Check the value of \ @@\
		          KERNEL_BUILD_DIR in site.mcr file."; \ @@\
		    exit 1;  \  @@\
                 fi; \ @@\
                 $(MODPOST) $(MODPOST_FLAG) -i $2 -o $1.symvers $(PWD)/$1 ;	\ @@\
		 $(C_COMP) -o $1.mod.o -c $(KCFLAGS) $(call gpfs_module_name,$1) $1.mod.c
#endif


#endif

SharedObjectTarget(libgpfs_gpl.so, tscalls.o, -lc)
InstallFiles(libgpfs_gpl.so, $(INSTPROGFLAGS), $(GPL_LIB_DIR))

tracedev: tracedev.ko tracedev-ksyms.ko 
	$(RM) $@
	$(BARELD) -r -o $@  -Map $@.map --cref $(MMLDFLAGS) $^
#if (LINUX_KERNEL_VERSION > 2060000)
	@if [ ! -f $(SYSVERFILE) ]; then \ @@\
		echo "WARNING: $(SYSVERFILE) file not found. Check the value of KERNEL_BUILD_DIR \ @@\
			in site.mcr file"; \ @@\
	fi
	$(call handle_modpost,$@,$(SYSVERFILE))
	mv -f $@ $@.tmp
	$(BARELD) -r -o $@ -Map $@.map --cref $(MMLDFLAGS) $@.tmp $@.mod.o $$($(C_COMP) -print-libgcc-file-name)
	mv -f $@.mod.c $@.mod.c.saved
	rm -f $@.tmp
#endif

MMFS_KEXTS = mmfslinux 
#if (LINUX_KERNEL_VERSION > 2060000) 
MMFS_KEXTS += mmfs26
#endif

#ifdef MOUNT_HELPER
ROOT_CMDS = lxtrace dumpconv umount.gpfs
#else
ROOT_CMDS = lxtrace dumpconv 
#endif

SITEMCRREV_ARG = $(filter 1.%,$(SITEMCRREV_RAW))
KCFLAGS += -D'SITEMCRREV="$(SITEMCRREV_ARG)"'

mmfslinux: $(LINUX_CUSTOM) $(GPL_LIB_DIR)/libarch-gpl_cust.a mmwrap.ko tracedev
	$(RM) $@
	$(BARELD) -r -o $@ $(LINUX_CUSTOM) $(GPL_LIB_DIR)/libarch-gpl_cust.a \
                -Map $@.map --cref $(MMLDFLAGS) \
                mmwrap.ko $$($(C_COMP) -print-libgcc-file-name)
#if (LINUX_KERNEL_VERSION > 2060000)
	$(call handle_modpost,$@,tracedev.symvers)
	mv -f $@ $@.tmp
	$(BARELD) -r -o $@ -Map $@.map --cref $(MMLDFLAGS) $@.tmp $@.mod.o $$($(C_COMP) -print-libgcc-file-name)
	mv -f $@.mod.c $@.mod.c.saved
	rm -f $@.tmp
#endif

#if (LINUX_KERNEL_VERSION > 2060000) 
mmfs26: $(DESTDIR)/bin/$(MMFS) mmfsmod.ko mmwrap.ko
	$(RM) $@
	$(BARELD) -r -o $@ $(DESTDIR)/bin/$(MMFS) mmfsmod.ko -Map $@.map \
		--cref $(MMLDFLAGS) mmwrap.ko \
		$$($(C_COMP) -print-libgcc-file-name)
	$(call handle_modpost,$@,mmfslinux.symvers)
	mv -f $@ $@.tmp
	$(BARELD) -r -o $@ -Map $@.map --cref $(MMLDFLAGS) $@.tmp $@.mod.o $$($(C_COMP) -print-libgcc-file-name)
	mv -f $@.mod.c $@.mod.c.saved
#endif

#if (LINUX_KERNEL_VERSION < 2060000)
MMFS_KEXTS += mmfs24

mmfs24: $(DESTDIR)/bin/$(MMFS) ibmInitWrap.ko
	$(RM) $@
	$(BARELD) -r -o $@ $(DESTDIR)/bin/$(MMFS) ibmInitWrap.ko \
		$(MMLDFLAGS) -Map $@.map

ibmInitWrap.ko: ibmInitWrap.C
	$(RM) $@
	$(C_COMP) -o $@ -c $(KCFLAGS) ibmInitWrap.C
#endif


clean:: ; $(RM) $(MMFS_KEXTS) $(ROOT_CMDS) tracedev *.symvers *.mod.c

MkdirTarget($(GPL_HEADER_DIR))
InstallHeaders($(HEADERS), $(GPL_HEADER_DIR))

InstallRootPrograms($(MMFS_KEXTS), $(DESTDIR)/bin)

/* Special rule for kdump so we get stabs info */
kdump-kern.ko: kdump-kern.c kdump.h
	$(RM) $@
	$(C_COMP) -o $@ -c $(KDUMPCFLAGS) -DNOSTABS $*.c

kdump-kern-stabs.ko: kdump-kern.c kdump.h
	$(RM) $@
	$(C_COMP) -o $@ -c $(KDUMPCFLAGS) -gstabs+ kdump-kern.c

KDUMP = kdump.o kdump-kern.ko kdump-kern-stabs.ko
ProgramTarget(kdump, $(KDUMP), , )

#ifdef MOUNT_HELPER
MNTHELP = MountHelper.o update_mtab.o
ProgramTarget(umount.gpfs, $(MNTHELP), , -L $(DESTDIR)/lib -lgpfs )
InstallFiles(umount.gpfs, $(INSTSHELLFLAGS), $(DESTDIR)/bin)
#endif
#if (LINUX_KERNEL_VERSION > 2060000) 
ProgramTarget(lxtrace, lxtrace.o, , $(PTHREADS) -lrt )
#else
ProgramTarget(lxtrace, lxtrace.o, , $(PTHREADS))
#endif
ProgramTarget(dumpconv, dumpconv.o, , )

InstallFiles(tracedev, $(INSTSHELLFLAGS), $(DESTDIR)/bin)
#ifndef SRC_BUILD
InstallFiles(lxtrace.sial, $(INSTSHELLFLAGS), $(DESTDIR)/bin)
InstallFiles(mmdumpfilocks.sial, $(INSTSHELLFLAGS), $(DESTDIR)/bin)
#endif

InstallRootPrograms($(ROOT_CMDS), $(DESTDIR)/bin)

/* RPM source build option to install images for kernel modules */
BUILD_DESTDIR = /usr/lpp/mmfs/bin
BUILD_INSTALL = $(MMFS_KEXTS) $(ROOT_CMDS) tracedev

InstallImages:: $(BUILD_INSTALL)
	@(case '$(MAKEFLAGS)' in *[ik]*) set +e;; esac; \
	for i in $(BUILD_INSTALL); do \
	(echo $$i; $(INSTALL) $(INSTROOTFLAGS) $$i $(BUILD_DESTDIR)/$$i) done)
#ifdef MOUNT_HELPER
	$(INSTALL) $(INSTROOTFLAGS) umount.gpfs /sbin/umount.gpfs
#endif

TRACELIST = gplInit.c block.c dir.c file.c inode.c super.c \
            cxiVFSStats.c cxiSystem.c cxiIOBuffer.c kx.c ss.c \
            mmap.c acl.c

TraceTarget(gpl-linux, $(TRACELIST))

DependTargetPK()