Makefile 5.2 KB

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  1. #
  2. # kbuild file for firmware/
  3. #
  4. # Create $(fwabs) from $(CONFIG_EXTRA_FIRMWARE_DIR) -- if it doesn't have a
  5. # leading /, it's relative to $(srctree).
  6. fwdir := $(subst ",,$(CONFIG_EXTRA_FIRMWARE_DIR))
  7. fwabs := $(addprefix $(srctree)/,$(filter-out /%,$(fwdir)))$(filter /%,$(fwdir))
  8. fw-external-y := $(subst ",,$(CONFIG_EXTRA_FIRMWARE))
  9. # There are three cases to care about:
  10. # 1. Building kernel with CONFIG_FIRMWARE_IN_KERNEL=y -- $(fw-shipped-y) should
  11. # include the firmware files to include, according to .config
  12. # 2. 'make modules_install', which will install firmware for modules, and
  13. # _also_ for the in-kernel drivers when CONFIG_FIRMWARE_IN_KERNEL=n
  14. # 3. 'make firmware_install', which installs all firmware, unconditionally.
  15. # For the former two cases we want $(fw-shipped-y) and $(fw-shipped-m) to be
  16. # accurate. In the latter case it doesn't matter -- it'll use $(fw-shipped-all).
  17. # But be aware that the config file might not be included at all.
  18. fw-shipped-all := $(fw-shipped-y) $(fw-shipped-m) $(fw-shipped-)
  19. # Directories which we _might_ need to create, so we have a rule for them.
  20. firmware-dirs := $(sort $(patsubst %,$(objtree)/$(obj)/%/,$(dir $(fw-external-y) $(fw-shipped-all))))
  21. quiet_cmd_mkdir = MKDIR $(patsubst $(objtree)/%,%,$@)
  22. cmd_mkdir = mkdir -p $@
  23. quiet_cmd_ihex = IHEX $@
  24. cmd_ihex = $(OBJCOPY) -Iihex -Obinary $< $@
  25. quiet_cmd_ihex2fw = IHEX2FW $@
  26. cmd_ihex2fw = $(objtree)/$(obj)/ihex2fw $< $@
  27. quiet_cmd_h16tofw = H16TOFW $@
  28. cmd_h16tofw = $(objtree)/$(obj)/ihex2fw -w $< $@
  29. quiet_cmd_fwbin = MK_FW $@
  30. cmd_fwbin = FWNAME="$(patsubst firmware/%.gen.S,%,$@)"; \
  31. FWSTR="$(subst /,_,$(subst .,_,$(subst -,_,$(patsubst \
  32. firmware/%.gen.S,%,$@))))"; \
  33. ASM_WORD=$(if $(CONFIG_64BIT),.quad,.long); \
  34. ASM_ALIGN=$(if $(CONFIG_64BIT),3,2); \
  35. PROGBITS=$(if $(CONFIG_ARM),%,@)progbits; \
  36. echo "/* Generated by firmware/Makefile */" > $@;\
  37. echo " .section .rodata" >>$@;\
  38. echo " .p2align $${ASM_ALIGN}" >>$@;\
  39. echo "_fw_$${FWSTR}_bin:" >>$@;\
  40. echo " .incbin \"$(2)\"" >>$@;\
  41. echo "_fw_end:" >>$@;\
  42. echo " .section .rodata.str,\"aMS\",$${PROGBITS},1" >>$@;\
  43. echo " .p2align $${ASM_ALIGN}" >>$@;\
  44. echo "_fw_$${FWSTR}_name:" >>$@;\
  45. echo " .string \"$$FWNAME\"" >>$@;\
  46. echo " .section .builtin_fw,\"a\",$${PROGBITS}" >>$@;\
  47. echo " .p2align $${ASM_ALIGN}" >>$@;\
  48. echo " $${ASM_WORD} _fw_$${FWSTR}_name" >>$@;\
  49. echo " $${ASM_WORD} _fw_$${FWSTR}_bin" >>$@;\
  50. echo " $${ASM_WORD} _fw_end - _fw_$${FWSTR}_bin" >>$@;
  51. # One of these files will change, or come into existence, whenever
  52. # the configuration changes between 32-bit and 64-bit. The .S files
  53. # need to change when that happens.
  54. wordsize_deps := $(wildcard include/config/64bit.h include/config/32bit.h \
  55. include/config/ppc32.h include/config/ppc64.h \
  56. include/config/superh32.h include/config/superh64.h \
  57. include/config/x86_32.h include/config/x86_64.h)
  58. # Workaround for make < 3.81, where .SECONDEXPANSION doesn't work.
  59. # It'll end up depending on these targets, so make them a PHONY rule which
  60. # depends on _all_ the directories in $(firmware-dirs), and it'll work out OK.
  61. PHONY += $(objtree)/$$(%) $(objtree)/$(obj)/$$(%)
  62. $(objtree)/$$(%) $(objtree)/$(obj)/$$(%): $(firmware-dirs)
  63. @true
  64. # For the $$(dir %) trick, where we need % to be expanded first.
  65. .SECONDEXPANSION:
  66. $(patsubst %,$(obj)/%.gen.S, $(fw-shipped-y)): %: $(wordsize_deps) \
  67. | $(objtree)/$$(dir %)
  68. $(call cmd,fwbin,$(patsubst %.gen.S,%,$@))
  69. $(patsubst %,$(obj)/%.gen.S, $(fw-external-y)): %: $(wordsize_deps) \
  70. include/config/builtin/firmware/dir.h | $(objtree)/$$(dir %)
  71. $(call cmd,fwbin,$(fwabs)/$(patsubst $(obj)/%.gen.S,%,$@))
  72. # The .o files depend on the binaries directly; the .S files don't.
  73. $(patsubst %,$(obj)/%.gen.o, $(fw-shipped-y)): %.gen.o: %
  74. $(patsubst %,$(obj)/%.gen.o, $(fw-external-y)): $(obj)/%.gen.o: $(fwdir)/%
  75. # .ihex is used just as a simple way to hold binary files in a source tree
  76. # where binaries are frowned upon. They are directly converted with objcopy.
  77. $(obj)/%: $(obj)/%.ihex | $(objtree)/$(obj)/$$(dir %)
  78. $(call cmd,ihex)
  79. # .HEX is also Intel HEX, but where the offset and length in each record
  80. # is actually meaningful, because the firmware has to be loaded in a certain
  81. # order rather than as a single binary blob. Thus, we convert them into our
  82. # more compact binary representation of ihex records (<linux/ihex.h>)
  83. $(obj)/%.fw: $(obj)/%.HEX $(obj)/ihex2fw | $(objtree)/$(obj)/$$(dir %)
  84. $(call cmd,ihex2fw)
  85. # .H16 is our own modified form of Intel HEX, with 16-bit length for records.
  86. $(obj)/%.fw: $(obj)/%.H16 $(obj)/ihex2fw | $(objtree)/$(obj)/$$(dir %)
  87. $(call cmd,h16tofw)
  88. $(firmware-dirs):
  89. $(call cmd,mkdir)
  90. obj-y += $(patsubst %,%.gen.o, $(fw-external-y))
  91. obj-$(CONFIG_FIRMWARE_IN_KERNEL) += $(patsubst %,%.gen.o, $(fw-shipped-y))
  92. # Remove .S files and binaries created from ihex
  93. # (during 'make clean' .config isn't included so they're all in $(fw-shipped-))
  94. targets := $(fw-shipped-) $(patsubst $(obj)/%,%, \
  95. $(shell find $(obj) -name \*.gen.S 2>/dev/null))
  96. # Without this, built-in.o won't be created when it's empty, and the
  97. # final vmlinux link will fail.
  98. obj-n := dummy
  99. hostprogs-y := ihex2fw