firmware/Makefile

   1 #
   2 # kbuild file for firmware/
   3 #
   4
   5 # Create $(fwabs) from $(CONFIG_EXTRA_FIRMWARE_DIR) -- if it doesn't have a
   6 # leading /, it's relative to $(srctree).
   7 fwdir := $(subst ",,$(CONFIG_EXTRA_FIRMWARE_DIR))
   8 fwabs := $(addprefix $(srctree)/,$(filter-out /%,$(fwdir)))$(filter /%,$(fwdir))
   9
  10 fw-external-y := $(subst ",,$(CONFIG_EXTRA_FIRMWARE))
  11
  12 # There are three cases to care about:
  13 # 1. Building kernel with CONFIG_FIRMWARE_IN_KERNEL=y -- $(fw-shipped-y) should
  14 #    include the firmware files to include, according to .config
  15 # 2. 'make modules_install', which will install firmware for modules, and
  16 #    _also_ for the in-kernel drivers when CONFIG_FIRMWARE_IN_KERNEL=n
  17 # 3. 'make firmware_install', which installs all firmware, unconditionally.
  18
  19 # For the former two cases we want $(fw-shipped-y) and $(fw-shipped-m) to be
  20 # accurate. In the latter case it doesn't matter -- it'll use $(fw-shipped-all).
  21 # But be aware that the config file might not be included at all.
  22
  23
  24 fw-shipped-all := $(fw-shipped-y) $(fw-shipped-m) $(fw-shipped-)
  25
  26 # Directories which we _might_ need to create, so we have a rule for them.
  27 firmware-dirs := $(sort $(patsubst %,$(objtree)/$(obj)/%/,$(dir $(fw-external-y) $(fw-shipped-all))))
  28
  29 quiet_cmd_mkdir = MKDIR   $(patsubst $(objtree)/%,%,$@)
  30       cmd_mkdir = mkdir -p $@
  31
  32 quiet_cmd_ihex  = IHEX    $@
  33       cmd_ihex  = $(OBJCOPY) -Iihex -Obinary $< $@
  34
  35 quiet_cmd_fwbin = MK_FW   $@
  36       cmd_fwbin = FWNAME="$(patsubst firmware/%.gen.S,%,$@)";                \
  37                   FWSTR="$(subst /,_,$(subst .,_,$(subst -,_,$(patsubst      \
  38                                 firmware/%.gen.S,%,$@))))";                  \
  39                   ASM_WORD=$(if $(CONFIG_64BIT),.quad,.long);                \
  40                   ASM_ALIGN=$(if $(CONFIG_64BIT),3,2);                       \
  41                   PROGBITS=$(if $(CONFIG_ARM),%,@)progbits;                  \
  42                   echo "/* Generated by firmware/Makefile */"           > $@;\
  43                   echo "    .section .rodata"                           >>$@;\
  44                   echo "    .p2align $${ASM_ALIGN}"                     >>$@;\
  45                   echo "_fw_$${FWSTR}_bin:"                             >>$@;\
  46                   echo "    .incbin \"$(2)\""                           >>$@;\
  47                   echo "_fw_end:"                                       >>$@;\
  48                   echo "   .section .rodata.str,\"aMS\",$${PROGBITS},1" >>$@;\
  49                   echo "    .p2align $${ASM_ALIGN}"                     >>$@;\
  50                   echo "_fw_$${FWSTR}_name:"                            >>$@;\
  51                   echo "    .string \"$$FWNAME\""                       >>$@;\
  52                   echo "    .section .builtin_fw,\"a\",$${PROGBITS}"    >>$@;\
  53                   echo "    .p2align $${ASM_ALIGN}"                     >>$@;\
  54                   echo "    $${ASM_WORD} _fw_$${FWSTR}_name"            >>$@;\
  55                   echo "    $${ASM_WORD} _fw_$${FWSTR}_bin"             >>$@;\
  56                   echo "    $${ASM_WORD} _fw_end - _fw_$${FWSTR}_bin"   >>$@;
  57
  58 # One of these files will change, or come into existence, whenever
  59 # the configuration changes between 32-bit and 64-bit. The .S files
  60 # need to change when that happens.
  61 wordsize_deps := $(wildcard include/config/64bit.h include/config/32bit.h \
  62                 include/config/ppc32.h include/config/ppc64.h \
  63                 include/config/superh32.h include/config/superh64.h \
  64                 include/config/x86_32.h include/config/x86_64.h)
  65
  66 # Workaround for make < 3.81, where .SECONDEXPANSION doesn't work.
  67 # It'll end up depending on these targets, so make them a PHONY rule which
  68 # depends on _all_ the directories in $(firmware-dirs), and it'll work out OK.
  69 PHONY += $(objtree)/$$(%) $(objtree)/$(obj)/$$(%)
  70 $(objtree)/$$(%) $(objtree)/$(obj)/$$(%): $(firmware-dirs)
  71         @true
  72
  73 # For the $$(dir %) trick, where we need % to be expanded first.
  74 .SECONDEXPANSION:
  75
  76 $(patsubst %,$(obj)/%.gen.S, $(fw-shipped-y)): %: $(wordsize_deps) \
  77                 | $(objtree)/$$(dir %)
  78         $(call cmd,fwbin,$(patsubst %.gen.S,%,$@))
  79 $(patsubst %,$(obj)/%.gen.S, $(fw-external-y)): %: $(wordsize_deps) \
  80                 include/config/builtin/firmware/dir.h | $(objtree)/$$(dir %)
  81         $(call cmd,fwbin,$(fwabs)/$(patsubst $(obj)/%.gen.S,%,$@))
  82
  83 # The .o files depend on the binaries directly; the .S files don't.
  84 $(patsubst %,$(obj)/%.gen.o, $(fw-shipped-y)): %.gen.o: %
  85 $(patsubst %,$(obj)/%.gen.o, $(fw-external-y)): $(obj)/%.gen.o: $(fwdir)/%
  86
  87 $(obj)/%: $(obj)/%.ihex | $(objtree)/$(obj)/$$(dir %)
  88         $(call cmd,ihex)
  89
  90 $(firmware-dirs):
  91         $(call cmd,mkdir)
  92
  93 obj-y                            += $(patsubst %,%.gen.o, $(fw-external-y))
  94 obj-$(CONFIG_FIRMWARE_IN_KERNEL) += $(patsubst %,%.gen.o, $(fw-shipped-y))
  95
  96 # Remove .S files and binaries created from ihex
  97 # (during 'make clean' .config isn't included so they're all in $(fw-shipped-))
  98 targets := $(fw-shipped-) $(patsubst $(obj)/%,%, \
  99                                 $(shell find $(obj) -name \*.gen.S 2>/dev/null))
 100
 101 # Without this, built-in.o won't be created when it's empty, and the
 102 # final vmlinux link will fail.
 103 obj-n := dummy