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firmware: Add CONFIG_EXTRA_FIRMWARE option
This allows arbitrary firmware files to be included in the static kernel where the firmware loader can find them without requiring userspace to be alive. (Updated and CONFIG_EXTRA_FIRMWARE_DIR added with lots of help from Johannes Berg). Signed-off-by: David Woodhouse <[email protected]> Signed-off-by: Johannes Berg <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,88 @@ | ||
| # | ||
| # kbuild file for firmware/ | ||
| # | ||
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| # Create $(fwabs) from $(CONFIG_EXTRA_FIRMWARE_DIR) -- if it doesn't have a | ||
| # leading /, it's relative to $(srctree). | ||
| fwdir := $(subst ",,$(CONFIG_EXTRA_FIRMWARE_DIR)) | ||
| fwabs := $(addprefix $(srctree)/,$(filter-out /%,$(fwdir)))$(filter /%,$(fwdir)) | ||
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| fw-external-y := $(subst ",,$(CONFIG_EXTRA_FIRMWARE)) | ||
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| firmware-y := $(fw-external-y) $(fw-shipped-y) | ||
| firmware-dirs := $(sort $(patsubst %,$(objtree)/$(obj)/%/,$(dir $(firmware-y) $(fw-shipped-)))) | ||
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| quiet_cmd_mkdir = MKDIR $(patsubst $(objtree)/%,%,$@) | ||
| cmd_mkdir = mkdir -p $@ | ||
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| quiet_cmd_ihex = IHEX $@ | ||
| cmd_ihex = $(OBJCOPY) -Iihex -Obinary $< $@ | ||
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| quiet_cmd_fwbin = MK_FW $@ | ||
| cmd_fwbin = FWNAME="$(patsubst firmware/%.gen.S,%,$@)"; \ | ||
| FWSTR="$(subst /,_,$(subst .,_,$(subst -,_,$(patsubst \ | ||
| firmware/%.gen.S,%,$@))))"; \ | ||
| ASM_WORD=$(if $(CONFIG_64BIT),.quad,.long); \ | ||
| ASM_ALIGN=$(if $(CONFIG_64BIT),3,2); \ | ||
| PROGBITS=$(if $(CONFIG_ARM),%,@)progbits; \ | ||
| echo "/* Generated by firmware/Makefile */" > $@;\ | ||
| echo " .section .rodata" >>$@;\ | ||
| echo " .p2align $${ASM_ALIGN}" >>$@;\ | ||
| echo "_fw_$${FWSTR}_bin:" >>$@;\ | ||
| echo " .incbin \"$(2)\"" >>$@;\ | ||
| echo "_fw_end:" >>$@;\ | ||
| echo " .section .rodata.str,\"aMS\",$${PROGBITS},1" >>$@;\ | ||
| echo " .p2align $${ASM_ALIGN}" >>$@;\ | ||
| echo "_fw_$${FWSTR}_name:" >>$@;\ | ||
| echo " .string \"$$FWNAME\"" >>$@;\ | ||
| echo " .section .builtin_fw,\"a\",$${PROGBITS}" >>$@;\ | ||
| echo " .p2align $${ASM_ALIGN}" >>$@;\ | ||
| echo " $${ASM_WORD} _fw_$${FWSTR}_name" >>$@;\ | ||
| echo " $${ASM_WORD} _fw_$${FWSTR}_bin" >>$@;\ | ||
| echo " $${ASM_WORD} _fw_end - _fw_$${FWSTR}_bin" >>$@; | ||
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| # One of these files will change, or come into existence, whenever | ||
| # the configuration changes between 32-bit and 64-bit. The .S files | ||
| # need to change when that happens. | ||
| wordsize_deps := $(wildcard include/config/64bit.h include/config/32bit.h \ | ||
| include/config/ppc32.h include/config/ppc64.h \ | ||
| include/config/superh32.h include/config/superh64.h \ | ||
| include/config/x86_32.h include/config/x86_64.h) | ||
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| # Workaround for make < 3.81, where .SECONDEXPANSION doesn't work. | ||
| # It'll end up depending on these targets, so make them a PHONY rule which | ||
| # depends on _all_ the directories in $(firmware-dirs), and it'll work out OK. | ||
| PHONY += $(objtree)/$$(%) $(objtree)/$(obj)/$$(%) | ||
| $(objtree)/$$(%) $(objtree)/$(obj)/$$(%): $(firmware-dirs) | ||
| @true | ||
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| # For the $$(dir %) trick, where we need % to be expanded first. | ||
| .SECONDEXPANSION: | ||
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| $(patsubst %,$(obj)/%.gen.S, $(fw-shipped-y)): %: $(wordsize_deps) \ | ||
| | $(objtree)/$$(dir %) | ||
| $(call cmd,fwbin,$(patsubst %.gen.S,%,$@)) | ||
| $(patsubst %,$(obj)/%.gen.S, $(fw-external-y)): %: $(wordsize_deps) \ | ||
| include/config/builtin/firmware/dir.h | $(objtree)/$$(dir %) | ||
| $(call cmd,fwbin,$(fwabs)/$(patsubst $(obj)/%.gen.S,%,$@)) | ||
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| # The .o files depend on the binaries directly; the .S files don't. | ||
| $(patsubst %,$(obj)/%.gen.o, $(fw-shipped-y)): %.gen.o: % | ||
| $(patsubst %,$(obj)/%.gen.o, $(fw-external-y)): $(obj)/%.gen.o: $(fwdir)/% | ||
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| $(obj)/%: $(obj)/%.ihex | $(objtree)/$(obj)/$$(dir %) | ||
| $(call cmd,ihex) | ||
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| $(firmware-dirs): | ||
| $(call cmd,mkdir) | ||
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| obj-y := $(patsubst %,%.gen.o, $(firmware-y)) | ||
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| # Remove .S files and binaries created from ihex | ||
| # (during 'make clean' .config isn't included so they're all in $(fw-shipped-)) | ||
| targets := $(fw-shipped-) $(patsubst $(obj)/%,%, \ | ||
| $(shell find $(obj) -name \*.gen.S 2>/dev/null)) | ||
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| # Without this, built-in.o won't be created when it's empty, and the | ||
| # final vmlinux link will fail. | ||
| obj-n := dummy |