firmware/Makefile

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