#
# Kbuild for top-level directory of the kernel
# This file takes care of the following:
# 1) Generate bounds.h
# 2) Generate timeconst.h
# 3) Generate asm-offsets.h (may need bounds.h and timeconst.h)
# 4) Check for missing system calls

# Default sed regexp - multiline due to syntax constraints
define sed-y
	"/^->/{s:->#\(.*\):/* \1 */:; \
	s:^->\([^ ]*\) [\$$#]*\([-0-9]*\) \(.*\):#define \1 \2 /* \3 */:; \
	s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
	s:->::; p;}"
endef

# Use filechk to avoid rebuilds when a header changes, but the resulting file
# does not
define filechk_offsets
	(set -e; \
	 echo "#ifndef $2"; \
	 echo "#define $2"; \
	 echo "/*"; \
	 echo " * DO NOT MODIFY."; \
	 echo " *"; \
	 echo " * This file was generated by Kbuild"; \
	 echo " */"; \
	 echo ""; \
	 sed -ne $(sed-y); \
	 echo ""; \
	 echo "#endif" )
endef

#####
# 1) Generate bounds.h

#bounds-file := include/generated/bounds.h

#always  := $(bounds-file)
#targets := kernel/bounds.s

## We use internal kbuild rules to avoid the "is up to date" message from make
#kernel/bounds.s: kernel/bounds.c FORCE
	#$(Q)mkdir -p $(dir $@)
	#$(call if_changed_dep,cc_s_c)

#$(obj)/$(bounds-file): kernel/bounds.s FORCE
	#$(call filechk,offsets,__LINUX_BOUNDS_H__)

#####
# 2) Generate timeconst.h

#timeconst-file := include/generated/timeconst.h

#targets += $(timeconst-file)

#quiet_cmd_gentimeconst = GEN     $@
#define cmd_gentimeconst
	#(echo $(CONFIG_HZ) | bc -q $< ) > $@
#endef
#define filechk_gentimeconst
	#(echo $(CONFIG_HZ) | bc -q $< )
#endef

#$(obj)/$(timeconst-file): kernel/time/timeconst.bc FORCE
	#$(call filechk,gentimeconst)

#####
# 3) Generate asm-offsets.h
#

#offsets-file := include/generated/asm-offsets.h

#always  += $(offsets-file)
#targets += arch/$(SRCARCH)/kernel/asm-offsets.s

# We use internal kbuild rules to avoid the "is up to date" message from make
#arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \
                                      #$(obj)/$(timeconst-file) $(obj)/$(bounds-file) FORCE
	#$(Q)mkdir -p $(dir $@)
	#$(call if_changed_dep,cc_s_c)

#$(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE
	#$(call filechk,offsets,__ASM_OFFSETS_H__)

#####
# 4) Check for missing system calls
#

#always += missing-syscalls
#targets += missing-syscalls

#quiet_cmd_syscalls = CALL    $<
      #cmd_syscalls = $(CONFIG_SHELL) $< $(CC) $(c_flags) $(missing_syscalls_flags)

#missing-syscalls: scripts/checksyscalls.sh $(offsets-file) FORCE
	#$(call cmd,syscalls)

# Keep these three files during make clean
#no-clean-files := $(bounds-file) $(offsets-file) $(timeconst-file)

#ifdef CONFIG_ZEPHYRKERNEL
#targets += include/melis/kernel/rtos/zephyr/offsets.h
#always  += include/melis/kernel/rtos/zephyr/offsets.h

#define rule_cc_o_c_1
	#$(call echo-cmd,cc_o_c_1) $(cmd_cc_o_c_1);
#endef

#cmd_cc_o_c_1 = $(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(MELISINCLUDE) -c -o $@ $< \
			#-I$(srctree)/include/melis/kernel/rtos/zephyr \
			#-I$(srctree)/ekernel/rtos/zephyr/kernel/include \
			#-I$(srctree)/include/melis/kernel/rtos/zephyr/arch \
			#-I$(srctree)/include/melis/kernel/rtos/zephyr/arch/arm/cortex_m

#ekernel/rtos/zephyr/offsets/offsets.o: ekernel/rtos/zephyr/offsets/offsets.c 
	#$(call if_changed,cc_o_c_1)


#define offsetchk
	#$(Q)set -e;                                                \
	#$(kecho) '  CHK     $@';                                   \
	#mkdir -p $(dir $@);                                        \
	#$(srctree)/scripts/gen_offset_header.py -i $(1) -o $@.tmp; \
	#if [ -r $@ ] && cmp -s $@ $@.tmp; then                     \
	#rm -f $@.tmp;                                              \
	#else                                                       \
	#$(kecho) '  UPD     $@';                                   \
	#mv -f $@.tmp $@;                                           \
	#fi
#endef

#include/melis/kernel/rtos/zephyr/offsets.h: ekernel/rtos/zephyr/offsets/offsets.o
	#$(call offsetchk,ekernel/rtos/zephyr/offsets/offsets.o)
#endif