1# SPDX-License-Identifier: GPL-2.0 2# 3# kbuild file for firmware/ 4# 5 6# Create $(fwabs) from $(CONFIG_EXTRA_FIRMWARE_DIR) -- if it doesn't have a 7# leading /, it's relative to $(srctree). 8fwdir := $(subst $(quote),,$(CONFIG_EXTRA_FIRMWARE_DIR)) 9fwabs := $(addprefix $(srctree)/,$(filter-out /%,$(fwdir)))$(filter /%,$(fwdir)) 10 11fw-external-y := $(subst $(quote),,$(CONFIG_EXTRA_FIRMWARE)) 12 13quiet_cmd_fwbin = MK_FW $@ 14 cmd_fwbin = FWNAME="$(patsubst firmware/%.gen.S,%,$@)"; \ 15 FWSTR="$(subst /,_,$(subst .,_,$(subst -,_,$(patsubst \ 16 firmware/%.gen.S,%,$@))))"; \ 17 ASM_WORD=$(if $(CONFIG_64BIT),.quad,.long); \ 18 ASM_ALIGN=$(if $(CONFIG_64BIT),3,2); \ 19 PROGBITS=$(if $(CONFIG_ARM),%,@)progbits; \ 20 echo "/* Generated by firmware/Makefile */" > $@;\ 21 echo " .section .rodata" >>$@;\ 22 echo " .p2align 4" >>$@;\ 23 echo "_fw_$${FWSTR}_bin:" >>$@;\ 24 echo " .incbin \"$(2)\"" >>$@;\ 25 echo "_fw_end:" >>$@;\ 26 echo " .section .rodata.str,\"aMS\",$${PROGBITS},1" >>$@;\ 27 echo " .p2align $${ASM_ALIGN}" >>$@;\ 28 echo "_fw_$${FWSTR}_name:" >>$@;\ 29 echo " .string \"$$FWNAME\"" >>$@;\ 30 echo " .section .builtin_fw,\"a\",$${PROGBITS}" >>$@;\ 31 echo " .p2align $${ASM_ALIGN}" >>$@;\ 32 echo " $${ASM_WORD} _fw_$${FWSTR}_name" >>$@;\ 33 echo " $${ASM_WORD} _fw_$${FWSTR}_bin" >>$@;\ 34 echo " $${ASM_WORD} _fw_end - _fw_$${FWSTR}_bin" >>$@; 35 36# One of these files will change, or come into existence, whenever 37# the configuration changes between 32-bit and 64-bit. The .S files 38# need to change when that happens. 39wordsize_deps := $(wildcard include/config/64bit.h include/config/32bit.h \ 40 include/config/ppc32.h include/config/ppc64.h \ 41 include/config/superh32.h include/config/superh64.h \ 42 include/config/x86_32.h include/config/x86_64.h \ 43 firmware/Makefile) 44 45$(patsubst %,$(obj)/%.gen.S, $(fw-external-y)): %: $(wordsize_deps) \ 46 include/config/extra/firmware/dir.h 47 $(call cmd,fwbin,$(fwabs)/$(patsubst $(obj)/%.gen.S,%,$@)) 48 49# The .o files depend on the binaries directly; the .S files don't. 50$(patsubst %,$(obj)/%.gen.o, $(fw-external-y)): $(obj)/%.gen.o: $(fwdir)/% 51 52obj-y += $(patsubst %,%.gen.o, $(fw-external-y)) 53 54ifeq ($(KBUILD_SRC),) 55# Makefile.build only creates subdirectories for O= builds, but external 56# firmware might live outside the kernel source tree 57_dummy := $(foreach d,$(addprefix $(obj)/,$(dir $(fw-external-y))), $(shell [ -d $(d) ] || mkdir -p $(d))) 58endif 59 60targets := $(patsubst $(obj)/%,%, \ 61 $(shell find $(obj) -name \*.gen.S 2>/dev/null)) 62# Without this, built-in.o won't be created when it's empty, and the 63# final vmlinux link will fail. 64obj- := dummy 65