# -*- makefile -*- : Force emacs to use Makefile mode

# This file contains various boring housekeeping functions that would
# otherwise seriously clutter up the main Makefile.

# Objects to be removed by "make clean"
#
CLEANUP	:= $(BIN)/*.* # *.* to avoid catching the "CVS" directory

# Version number calculations 
#
VERSION_MAJOR	= 5
VERSION_MINOR	= 5
VERSION_PATCH	= 0
EXTRAVERSION	=	
MM_VERSION	= $(VERSION_MAJOR).$(VERSION_MINOR)
VERSION		= $(MM_VERSION).$(VERSION_PATCH)$(EXTRAVERSION)
CFLAGS		+= -DVERSION_MAJOR=$(VERSION_MAJOR) \
		   -DVERSION_MINOR=$(VERSION_MINOR) \
		   -DVERSION=\"$(VERSION)\"
IDENT		= '$(@F) $(VERSION) (GPL) etherboot.org'
version :
	@echo $(VERSION)

# Check for tools that can cause failed builds
#
.toolcheck : Makefile Config
	@if $(CC) -v 2>&1 | grep -is 'gcc version 2\.96' > /dev/null; then \
		echo 'gcc 2.96 is unsuitable for compiling Etherboot'; \
		echo 'Use gcc 2.95 or gcc 3.x instead'; \
		exit 1; \
	fi
	@if [ `perl -e 'use bytes; print chr(255)' | wc -c` = 2 ]; then \
		echo 'Your Perl version has a Unicode handling bug'; \
		echo 'Execute this command before compiling Etherboot:'; \
		echo 'export LANG=$${LANG%.UTF-8}'; \
		exit 1; \
	fi
	@$(TOUCH) $@
VERYCLEANUP	+= .toolcheck

# Check for an old version of gas (binutils 2.9.1)
#
OLDGAS	:= $(shell $(AS) --version | grep -q '2\.9\.1' && echo -DGAS291)
CFLAGS	+= $(OLDGAS)
oldgas :
	@echo $(oldgas)

# compiler.h is needed for our linking and debugging system
#
CFLAGS	+= -include compiler.h

# config/%.h files are generated from config.h using mkconfig.pl
config/%.h : config.h
	$(MKCONFIG) $<
CLEANUP	+= config/*.h

# SRCDIRS lists all directories containing source files.
srcdirs :
	@echo $(SRCDIRS)

# SRCS lists all .c or .S files found in any SRCDIR
#
SRCS	+= $(wildcard $(patsubst %,%/*.c,$(SRCDIRS)))
SRCS	+= $(wildcard $(patsubst %,%/*.S,$(SRCDIRS)))
srcs :
	@echo $(SRCS)

# AUTO_SRCS lists all files in SRCS that are not mentioned in
# NON_AUTO_SRCS.  Files should be added to NON_AUTO_SRCS if they
# cannot be built using the standard build template.
#
AUTO_SRCS = $(filter-out $(NON_AUTO_SRCS),$(SRCS))
autosrcs :
	@echo $(AUTO_SRCS)

# We automatically generate rules for any file mentioned in AUTO_SRCS
# using the following set of templates.  It would be cleaner to use
# $(eval ...), but this function exists only in GNU make >= 3.80.

# src_template : generate Makefile rules for a given source file
#
# $(1) is the full path to the source file (e.g. "drivers/net/rtl8139.c")
# $(2) is the full path to the .d file (e.g. "bin/deps/drivers/net/rtl8139.d")
# $(3) is the source type (e.g. "c")
# $(4) is the source base name (e.g. "rtl8139")
#
define src_template

	@echo "Generating Makefile rules for $(1)"
	@$(MKDIR) -p $(dir $(2))
	@$(RM) $(2)
	@$(TOUCH) $(2)
	$(foreach OBJ,$(if $(OBJS_$(4)),$(OBJS_$(4)),$(4)), \
		$(call obj_template,$(1),$(2),$(3),$(OBJ)))
	@$(PARSEROM) $(1) >> $(2)

endef

# obj_template : generate Makefile rules for a given resultant object
# of a particular source file.  (We can have multiple objects per
# source file via the OBJS_xxx list.)
#
# $(1) is the full path to the source file (e.g. "drivers/net/rtl8139.c")
# $(2) is the full path to the .d file (e.g. "bin/deps/drivers/net/rtl8139.d")
# $(3) is the source type (e.g. "c")
# $(4) is the object name (e.g. "rtl8139")
#
define obj_template

	@$(CPP) $(CFLAGS) $(CFLAGS_$(3)) $(CFLAGS_$(4)) \
		-M $(1) -MT "$(4)_DEPS" -MG | tr : = >> $(2)
	@echo -e '\n$$(BIN)/$(4).o : $(1) $$(MAKEDEPS) $$($(4)_DEPS)' \
		 '\n\t$$(RULE_$(3))\n' \
		 '\nBOBJS += $$(BIN)/$(4).o\n' \
		 $(foreach TGT,$(DEBUG_TARGETS), \
		    $(if $(RULE_$(3)_to_$(TGT)), \
		    '\n$$(BIN)/$(4).$(TGT) : $(1) $$(MAKEDEPS) $$($(4)_DEPS)' \
		    '\n\t$$(RULE_$(3)_to_$(TGT))\n' \
		    '\n$(TGT)_OBJS += $$(BIN)/$(4).$(TGT)\n' ) ) \
		 '\n$(2) : $$($(4)_DEPS)\n' \
		 '\nTAGS : $$($(4)_DEPS)\n' \
		>> $(2)

endef

# Rule to generate the Makefile rules files to be included
#
$(BIN)/deps/%.d : % $(MAKEDEPS) $(PARSEROM)
	$(if $(filter $(AUTO_SRCS),$<),$(call src_template,$<,$@,$(subst .,,$(suffix $<)),$(basename $(notdir $<))),@echo 'ERROR: $< is not an AUTO_SRC' ; exit 1)

# Calculate and include the list of Makefile rules files
#
AUTO_DEPS	= $(patsubst %,$(BIN)/deps/%.d,$(AUTO_SRCS))
include $(AUTO_DEPS)
autodeps :
	@echo $(AUTO_DEPS)
VERYCLEANUP	+= $(BIN)/deps

# The following variables are created by the Makefile rules files
#
bobjs :
	@echo $(BOBJS)
drivers :
	@echo $(DRIVERS)
.PHONY : drivers
roms :
	@echo $(ROMS)

# Generate the NIC file from the parsed source files.  The NIC file is
# only for rom-o-matic.
#
$(BIN)/NIC : $(AUTO_DEPS)
	@echo '# This is an automatically generated file, do not edit' > $@
	@echo '# It does not affect anything in the build, ' \
	     'it is only for rom-o-matic' >> $@
	@echo >> $@
	@perl -ne 'chomp; print "$$1\n" if /\# NIC\t(.*)$$/' $^ >> $@
CLEANUP		+= $(BIN)/NIC

# Analyse a target name (e.g. "bin/dfe538--prism2_pci.zrom.tmp") and
# derive the variables:
# 
# TGT_ELEMENTS : the elements of the target (e.g. "dfe538 prism2_pci")
# TGT_PREFIX   : the prefix type (e.g. "zrom")
# TGT_DRIVERS  : the driver for each element (e.g. "rtl8139 prism2_pci")
# TGT_ROM_NAME : the ROM name (e.g. "dfe538")
# TGT_MEDIA    : the media type (e.g. "rom")
#
DRIVERS_etherboot = $(DRIVERS)
CARD_DRIVER	= $(firstword $(DRIVER_$(1)) $(1))
TGT_ELEMENTS	= $(subst --, ,$(firstword $(subst ., ,$(notdir $@))))
TGT_PREFIX	= $(word 2,$(subst ., ,$(notdir $@)))
TGT_ROM_NAME	= $(firstword $(TGT_ELEMENTS))
TGT_DRIVERS	= $(strip $(if $(DRIVERS_$(TGT_ROM_NAME)), \
			       $(DRIVERS_$(TGT_ROM_NAME)), \
			       $(foreach TGT_ELEMENT,$(TGT_ELEMENTS), \
			         $(call CARD_DRIVER,$(TGT_ELEMENT))) ))
TGT_MEDIA	= $(subst z,,$(TGT_PREFIX))

# Look up ROM type and IDs for the current target
# (e.g. "bin/dfe538--prism2_pci.zrom.tmp") and derive the variables:
#
# TGT_ROM_TYPE   : PCI/ISA indicator (e.g. "pci")
# TGT_PCI_VENDOR : the PCI vendor ID (e.g. "0x1186")
# TGT_PCI_DEVICE : the PCI device ID (e.g. "0x1300")
#
TGT_ROM_TYPE	= $(ROM_TYPE_$(TGT_ROM_NAME))
TGT_PCI_VENDOR	= $(PCI_VENDOR_$(TGT_ROM_NAME))
TGT_PCI_DEVICE	= $(PCI_DEVICE_$(TGT_ROM_NAME))

# Calculate link-time options for the current target
# (e.g. "bin/dfe538--prism2_pci.zrom.tmp") and derive the variables:
#
# TGT_LD_DRIVERS : symbols to require in order to drag in the relevant drivers
#		   (e.g. "obj_rtl8139 obj_prism2_pci")
# TGT_LD_PREFIX  : symbols to require in order to drag in the relevant prefix
#		   (e.g. "obj_zpciprefix")
# TGT_LD_IDS :     symbols to define in order to fill in ID structures in the
#		   ROM header (e.g."pci_vendor_id=0x1186 pci_device_id=0x1300")
#
TGT_LD_DRIVERS	= $(subst -,_,$(patsubst %,obj_%,$(TGT_DRIVERS)))
TGT_LD_PREFIX	= obj_$(subst rom,$(TGT_ROM_TYPE),$(TGT_PREFIX))prefix
TGT_LD_IDS	= $(if $(TGT_PCI_VENDOR),pci_vendor_id=$(TGT_PCI_VENDOR)) \
		  $(if $(TGT_PCI_DEVICE),pci_device_id=$(TGT_PCI_DEVICE))

# Calculate linker flags based on link-time options for the current
# target type (e.g. "bin/dfe538--prism2_pci.zrom.tmp") and derive the
# variables:
#
# TGT_LD_FLAGS : target-specific flags to pass to linker (e.g.
#		 "-u obj_zpciprefix -u obj_rtl8139 -u obj_prism2_pci
#		  --defsym pci_vendor=0x1186 --defsym pci_device=0x1300")
#
TGT_LD_FLAGS	= $(foreach SYM,$(TGT_LD_PREFIX) $(TGT_LD_DRIVERS) obj_config,\
		    -u $(SYM) --defsym check_$(SYM)=$(SYM) ) \
		  $(patsubst %,--defsym %,$(TGT_LD_IDS))

# Calculate makerom flags for the specific target
# (e.g. "bin/dfe538--prism2_pci.zrom.tmp") and derive the variables:
#
# TGT_MAKEROM_FLAGS : target-specific flags for makerom (e.g.
#		      "-p 0x1186,0x1300")
#
TGT_MAKEROM_FLAGS = $(strip $(MAKEROM_FLAGS_$(TGT_ROM_NAME)) \
       $(if $(TGT_PCI_VENDOR),$(strip -p $(TGT_PCI_VENDOR),$(TGT_PCI_DEVICE))))

# Calculate list of debugging versions of objects to be included in
# the target.
#
COMMA		:= ,
DEBUG_LIST	= $(subst $(COMMA), ,$(DEBUG))
DEBUG_OBJ_BASE	= $(word 1,$(subst :, ,$(1))).dbg$(word 2,$(subst :, ,$(1)))
DEBUG_OBJ	= $(BIN)/$(call DEBUG_OBJ_BASE,$(1)).o
DEBUG_ORIG_OBJ	= $(BIN)/$(word 1,$(subst :, ,$(1))).o
DEBUG_OBJS	= $(foreach D,$(DEBUG_LIST),$(call DEBUG_OBJ,$(D)))
DEBUG_ORIG_OBJS	= $(foreach D,$(DEBUG_LIST),$(call DEBUG_ORIG_OBJ,$(D)))
BLIB_OBJS	= $(DEBUG_OBJS) $(filter-out $(DEBUG_ORIG_OBJS),$(BOBJS))

# Print out all derived information for a given target.
#
$(BIN)/%.info :
	@echo 'Elements             : $(TGT_ELEMENTS)'
	@echo 'Prefix               : $(TGT_PREFIX)'
	@echo 'Drivers              : $(TGT_DRIVERS)'
	@echo 'ROM name             : $(TGT_ROM_NAME)'
	@echo 'Media                : $(TGT_MEDIA)'
	@echo
	@echo 'ROM type             : $(TGT_ROM_TYPE)'
	@echo 'PCI vendor           : $(TGT_PCI_VENDOR)'
	@echo 'PCI device           : $(TGT_PCI_DEVICE)'
	@echo
	@echo 'LD driver symbols    : $(TGT_LD_DRIVERS)'
	@echo 'LD prefix symbols    : $(TGT_LD_PREFIX)'
	@echo 'LD ID symbols        : $(TGT_LD_IDS)'
	@echo
	@echo 'LD target flags      : $(TGT_LD_FLAGS)'
	@echo
	@echo 'makerom target flags : $(TGT_MAKEROM_FLAGS)'
	@echo
	@echo 'Debugging objects    : $(DEBUG_OBJS)'
	@echo 'Replaced objects     : $(DEBUG_ORIG_OBJS)'

# List of objects included in the last build of blib.  This is needed
# in order to correctly rebuild blib whenever the list of objects
# changes.
#
BLIB_LIST	= $(BIN)/.blib.list
ifneq ($(shell cat $(BLIB_LIST)),$(BLIB_OBJS))
$(shell echo "$(BLIB_OBJS)" > $(BLIB_LIST))
endif

$(BLIB_LIST) :

# Library of all objects
#
BLIB		= $(BIN)/blib.a
$(BLIB) : $(BLIB_OBJS) $(BLIB_LIST) $(MAKEDEPS)
	$(RM) $(BLIB)
	$(AR) r $@ $(BLIB_OBJS)
	$(RANLIB) $@
blib : $(BLIB)

# Build an intermediate object file from the objects required for the
# specified target.
#
$(BIN)/%.tmp : $(BLIB) $(MAKEDEPS) $(LDSCRIPT) 
	$(LD) $(LDFLAGS) -T $(LDSCRIPT) $(TGT_LD_FLAGS) $(BLIB) -o $@ \
		-Map $(BIN)/$*.tmp.map
	$(OBJDUMP) -ht $@ | $(SORTOBJDUMP) >> $(BIN)/$*.tmp.map

# Show a linker map for the specified target
#
$(BIN)/%.map : $(BIN)/%.tmp
	@less $(BIN)/$*.tmp.map

# Rules for each media format.  These are generated and placed in an
# external Makefile fragment.  We could do this via $(eval ...), but
# that would require make >= 3.80.
# 
# Note that there's an alternative way to generate most .rom images:
# they can be copied from their 'master' ROM image using cp and
# reprocessed with makerom to add the PCI IDs and ident string.  The
# relevant rule would look something like:
#
#   $(BIN)/dfe538%rom : $(BIN)/rtl8139%rom
#	cat $< $@
#	$(FINALISE_rom)
# 
# You can derive the ROM/driver relationships using the variables
# DRIVER_<rom> and/or ROMS_<driver>.
# 
# We don't currently do this, because (a) it would require generating
# yet more Makefile fragments (since you need a rule for each ROM in
# ROMS), and (b) the linker is so fast that it probably wouldn't make
# much difference to the overall build time.

media :
	@echo $(MEDIA)

AUTO_MEDIA	= $(filter-out $(NON_AUTO_MEDIA),$(MEDIA))
automedia :
	@echo $(AUTO_MEDIA)

# media_template : create Makefile rules for specified media
#
# $(1) is the media name (e.g. "rom")
# $(2) is the full path to the .d file (e.g. "bin/deps/rom.media.d")
#
define media_template

	@echo "Generating Makefile rules for $(1) media"
	@$(MKDIR) -p $(dir $(2))
	@$(RM) $(2)
	@$(TOUCH) $(2)
	@echo -e '$$(BIN)/%$(1) : $$(BIN)/%$(1).tmp' \
		  '\n\t$$(OBJCOPY) -O binary $$< $$@' \
		  '\n\t$$(FINALISE_$(1))' \
		> $(2)

endef

# Rule to generate the Makefile rules to be included
#
$(BIN)/deps/%.media.d : $(MAKEDEPS)
	$(if $(filter $(AUTO_MEDIA),$*), \
		$(call media_template,$*,$@), \
		@echo 'ERROR: $* is not an AUTO_MEDIA' ; exit 1)

# Calculate and include the list of Makefile rules files
#
MEDIA_DEPS		= $(patsubst %,$(BIN)/deps/%.media.d,$(AUTO_MEDIA))
mediadeps :
	@echo $(MEDIA_DEPS)
include $(MEDIA_DEPS)

# The "allXXXs" targets for each suffix
#
allroms allzroms : all%s : $(foreach ROM,$(ROMS),$(BIN)/$(ROM).%)
all%s : $(foreach DRIVER,$(DRIVERS),$(BIN)/$(DRIVER).%)

# The compressor utility
#
$(NRV2B) : util/nrv2b.c $(MAKEDEPS)
	$(HOST_CC) -O2 -DENCODE -DDECODE -DMAIN -DVERBOSE -DNDEBUG \
		       -DBITSIZE=32 -DENDIAN=0 -o $@ $<
CLEANUP	+= $(NRV2B)

# Auto-incrementing build serial number.  Append "bs" to your list of
# build targets to get a serial number printed at the end of the
# build.  Enable -DBUILD_SERIAL in order to see it when the code runs.
#
BUILDSERIAL_H		= config/.buildserial.h
BUILDSERIAL_NOW		= config/.buildserial.now
BUILDSERIAL_NEXT	= config/.buildserial.next

$(BUILDSERIAL_NOW) $(BUILDSERIAL_NEXT) :
	echo 1 > $@

$(BUILDSERIAL_H) : $(BUILDSERIAL_NOW) $(BUILDSERIAL_NEXT)
	echo '#define BUILD_SERIAL_NUM $(shell cat $<)' > $@

ifeq ($(filter bs,$(MAKECMDGOALS)),bs)
$(shell diff -q $(BUILDSERIAL_NOW) $(BUILDSERIAL_NEXT) > /dev/null || \
	cp -f $(BUILDSERIAL_NEXT) $(BUILDSERIAL_NOW))
endif

bs : $(BUILDSERIAL_NOW)
	@echo $$(( $(shell cat $<) + 1 )) > $(BUILDSERIAL_NEXT)
	@echo "Build serial number is $(shell cat $<)"

# List of available architectures
#
ARCHS	= $(filter-out CVS,$(patsubst arch/%,%,$(wildcard arch/*)))
archs :
	@echo $(ARCHS)

OTHER_ARCHS	= $(filter-out $(ARCH),$(ARCHS))
otherarchs :
	@echo $(OTHER_ARCHS)

# Build the TAGS file for emacs
#
TAGS : TAGS.$(ARCH)

TAGS.$(ARCH) : 
	ctags -e -R -f $@ $(foreach ARCH,$(OTHER_ARCHS),--exclude=arch/$(ARCH))
CLEANUP	+= TAGS*

# Symbol table checks
#
SYMTAB	= $(BIN)/symtab
$(SYMTAB) : $(BLIB)
	$(NM) -o -S $< > $@

symcheck : $(SYMTAB)
	$(SYMCHECK) $<

# Force rebuild for any given target
#
$(BIN)/%.rebuild :
	rm -f $(BIN)/$*
	$(MAKE) $(MAKEFLAGS) $(BIN)/$*

# Documentation
#
$(BIN)/doxygen.cfg : doxygen.cfg $(MAKEDEPS)
	$(PERL) -pe 's{\@SRCDIRS\@}{$(SRCDIRS)}; ' \
		-e  's{\@BIN\@}{$(BIN)}; ' \
		-e  's{\@ARCH\@}{$(ARCH)}; ' \
		$< > $@

$(BIN)/doc : $(BIN)/doxygen.cfg
	$(DOXYGEN) $<

.PHONY : $(BIN)/doc

VERYCLEANUP	+= $(BIN)/doc

doc : $(BIN)/doc

docview :
	@[ -f $(BIN)/doc/html/index.html ] || $(MAKE) $(BIN)/doc
	@if [ -n "$$BROWSER" ] ; then \
		( $$BROWSER $(BIN)/doc/html/index.html & ) ; \
	else \
		echo "Documentation index in $(BIN)/doc/html/index.html" ; \
	fi

# Clean-up
#
clean :
	$(RM) $(CLEANUP)

veryclean : clean
	$(RM) -r $(VERYCLEANUP)