firmware/Makefile

   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).
   8 fwdir := $(subst $(quote),,$(CONFIG_EXTRA_FIRMWARE_DIR))
   9 fwabs := $(addprefix $(srctree)/,$(filter-out /%,$(fwdir)))$(filter /%,$(fwdir))
  10
  11 fw-external-y := $(subst $(quote),,$(CONFIG_EXTRA_FIRMWARE))
  12
  13 quiet_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.
  39 wordsize_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
  52 obj-y                            += $(patsubst %,%.gen.o, $(fw-external-y))
  53
  54 ifeq ($(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)))
  58 endif
  59
  60 targets := $(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.
  64 obj- := dummy