linux/arch/mips/Makefile
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   1#
   2# This file is subject to the terms and conditions of the GNU General Public
   3# License.  See the file "COPYING" in the main directory of this archive
   4# for more details.
   5#
   6# Copyright (C) 1994, 95, 96, 2003 by Ralf Baechle
   7# DECStation modifications by Paul M. Antoine, 1996
   8# Copyright (C) 2002, 2003, 2004  Maciej W. Rozycki
   9#
  10# This file is included by the global makefile so that you can add your own
  11# architecture-specific flags and dependencies. Remember to do have actions
  12# for "archclean" cleaning up for this architecture.
  13#
  14
  15archscripts: scripts_basic
  16        $(Q)$(MAKE) $(build)=arch/mips/tools elf-entry
  17ifeq ($(CONFIG_CPU_LOONGSON3_WORKAROUNDS),y)
  18        $(Q)$(MAKE) $(build)=arch/mips/tools loongson3-llsc-check
  19endif
  20        $(Q)$(MAKE) $(build)=arch/mips/boot/tools relocs
  21
  22KBUILD_DEFCONFIG := 32r2el_defconfig
  23KBUILD_DTBS      := dtbs
  24
  25#
  26# Select the object file format to substitute into the linker script.
  27#
  28ifdef CONFIG_CPU_LITTLE_ENDIAN
  2932bit-tool-archpref     = mipsel
  3064bit-tool-archpref     = mips64el
  3132bit-bfd               = elf32-tradlittlemips
  3264bit-bfd               = elf64-tradlittlemips
  3332bit-emul              = elf32ltsmip
  3464bit-emul              = elf64ltsmip
  35else
  3632bit-tool-archpref     = mips
  3764bit-tool-archpref     = mips64
  3832bit-bfd               = elf32-tradbigmips
  3964bit-bfd               = elf64-tradbigmips
  4032bit-emul              = elf32btsmip
  4164bit-emul              = elf64btsmip
  42endif
  43
  44ifdef CONFIG_32BIT
  45tool-archpref           = $(32bit-tool-archpref)
  46UTS_MACHINE             := mips
  47endif
  48ifdef CONFIG_64BIT
  49tool-archpref           = $(64bit-tool-archpref)
  50UTS_MACHINE             := mips64
  51endif
  52
  53ifdef cross_compiling
  54  ifeq ($(CROSS_COMPILE),)
  55    CROSS_COMPILE := $(call cc-cross-prefix, $(tool-archpref)-linux-  $(tool-archpref)-linux-gnu-  $(tool-archpref)-unknown-linux-gnu-)
  56  endif
  57endif
  58
  59ifdef CONFIG_FUNCTION_GRAPH_TRACER
  60  ifndef KBUILD_MCOUNT_RA_ADDRESS
  61    ifeq ($(call cc-option-yn,-mmcount-ra-address), y)
  62      cflags-y += -mmcount-ra-address -DKBUILD_MCOUNT_RA_ADDRESS
  63    endif
  64  endif
  65endif
  66cflags-y += $(call cc-option, -mno-check-zero-division)
  67
  68ifdef CONFIG_32BIT
  69ld-emul                 = $(32bit-emul)
  70vmlinux-32              = vmlinux
  71vmlinux-64              = vmlinux.64
  72
  73cflags-y                += -mabi=32
  74endif
  75
  76ifdef CONFIG_64BIT
  77ld-emul                 = $(64bit-emul)
  78vmlinux-32              = vmlinux.32
  79vmlinux-64              = vmlinux
  80
  81cflags-y                += -mabi=64
  82endif
  83
  84all-$(CONFIG_BOOT_ELF32)        := $(vmlinux-32)
  85all-$(CONFIG_BOOT_ELF64)        := $(vmlinux-64)
  86all-$(CONFIG_SYS_SUPPORTS_ZBOOT)+= vmlinuz
  87
  88#
  89# GCC uses -G 0 -mabicalls -fpic as default.  We don't want PIC in the kernel
  90# code since it only slows down the whole thing.  At some point we might make
  91# use of global pointer optimizations but their use of $28 conflicts with
  92# the current pointer optimization.
  93#
  94# The DECStation requires an ECOFF kernel for remote booting, other MIPS
  95# machines may also.  Since BFD is incredibly buggy with respect to
  96# crossformat linking we rely on the elf2ecoff tool for format conversion.
  97#
  98cflags-y                        += -G 0 -mno-abicalls -fno-pic -pipe
  99cflags-y                        += -msoft-float
 100LDFLAGS_vmlinux                 += -G 0 -static -n -nostdlib
 101KBUILD_AFLAGS_MODULE            += -mlong-calls
 102KBUILD_CFLAGS_MODULE            += -mlong-calls
 103
 104ifeq ($(CONFIG_RELOCATABLE),y)
 105LDFLAGS_vmlinux                 += --emit-relocs
 106endif
 107
 108#
 109# pass -msoft-float to GAS if it supports it.  However on newer binutils
 110# (specifically newer than 2.24.51.20140728) we then also need to explicitly
 111# set ".set hardfloat" in all files which manipulate floating point registers.
 112#
 113ifneq ($(call as-option,-Wa$(comma)-msoft-float,),)
 114        cflags-y                += -DGAS_HAS_SET_HARDFLOAT -Wa,-msoft-float
 115endif
 116
 117cflags-y += -ffreestanding
 118
 119cflags-$(CONFIG_CPU_BIG_ENDIAN)         += -EB
 120cflags-$(CONFIG_CPU_LITTLE_ENDIAN)      += -EL
 121
 122cflags-$(CONFIG_SB1XXX_CORELIS) += $(call cc-option,-mno-sched-prolog) \
 123                                   -fno-omit-frame-pointer
 124
 125# Some distribution-specific toolchains might pass the -fstack-check
 126# option during the build, which adds a simple stack-probe at the beginning
 127# of every function.  This stack probe is to ensure that there is enough
 128# stack space, else a SEGV is generated.  This is not desirable for MIPS
 129# as kernel stacks are small, placed in unmapped virtual memory, and do not
 130# grow when overflowed.  Especially on SGI IP27 platforms, this check will
 131# lead to a NULL pointer dereference in _raw_spin_lock_irq.
 132#
 133# In disassembly, this stack probe appears at the top of a function as:
 134#    sd         zero,<offset>(sp)
 135# Where <offset> is a negative value.
 136#
 137cflags-y += -fno-stack-check
 138
 139# binutils from v2.35 when built with --enable-mips-fix-loongson3-llsc=yes,
 140# supports an -mfix-loongson3-llsc flag which emits a sync prior to each ll
 141# instruction to work around a CPU bug (see __SYNC_loongson3_war in asm/sync.h
 142# for a description).
 143#
 144# We disable this in order to prevent the assembler meddling with the
 145# instruction that labels refer to, ie. if we label an ll instruction:
 146#
 147# 1: ll v0, 0(a0)
 148#
 149# ...then with the assembler fix applied the label may actually point at a sync
 150# instruction inserted by the assembler, and if we were using the label in an
 151# exception table the table would no longer contain the address of the ll
 152# instruction.
 153#
 154# Avoid this by explicitly disabling that assembler behaviour.
 155#
 156cflags-y += $(call as-option,-Wa$(comma)-mno-fix-loongson3-llsc,)
 157
 158#
 159# CPU-dependent compiler/assembler options for optimization.
 160#
 161cflags-$(CONFIG_CPU_R3000)      += -march=r3000
 162cflags-$(CONFIG_CPU_TX39XX)     += -march=r3900
 163cflags-$(CONFIG_CPU_R4300)      += -march=r4300 -Wa,--trap
 164cflags-$(CONFIG_CPU_VR41XX)     += -march=r4100 -Wa,--trap
 165cflags-$(CONFIG_CPU_R4X00)      += -march=r4600 -Wa,--trap
 166cflags-$(CONFIG_CPU_TX49XX)     += -march=r4600 -Wa,--trap
 167cflags-$(CONFIG_CPU_MIPS32_R1)  += -march=mips32 -Wa,--trap
 168cflags-$(CONFIG_CPU_MIPS32_R2)  += -march=mips32r2 -Wa,--trap
 169cflags-$(CONFIG_CPU_MIPS32_R5)  += -march=mips32r5 -Wa,--trap -modd-spreg
 170cflags-$(CONFIG_CPU_MIPS32_R6)  += -march=mips32r6 -Wa,--trap -modd-spreg
 171cflags-$(CONFIG_CPU_MIPS64_R1)  += -march=mips64 -Wa,--trap
 172cflags-$(CONFIG_CPU_MIPS64_R2)  += -march=mips64r2 -Wa,--trap
 173cflags-$(CONFIG_CPU_MIPS64_R5)  += -march=mips64r5 -Wa,--trap
 174cflags-$(CONFIG_CPU_MIPS64_R6)  += -march=mips64r6 -Wa,--trap
 175cflags-$(CONFIG_CPU_P5600)      += -march=p5600 -Wa,--trap -modd-spreg
 176cflags-$(CONFIG_CPU_R5000)      += -march=r5000 -Wa,--trap
 177cflags-$(CONFIG_CPU_R5500)      += $(call cc-option,-march=r5500,-march=r5000) \
 178                        -Wa,--trap
 179cflags-$(CONFIG_CPU_NEVADA)     += $(call cc-option,-march=rm5200,-march=r5000) \
 180                        -Wa,--trap
 181cflags-$(CONFIG_CPU_RM7000)     += $(call cc-option,-march=rm7000,-march=r5000) \
 182                        -Wa,--trap
 183cflags-$(CONFIG_CPU_SB1)        += $(call cc-option,-march=sb1,-march=r5000) \
 184                        -Wa,--trap
 185cflags-$(CONFIG_CPU_SB1)        += $(call cc-option,-mno-mdmx)
 186cflags-$(CONFIG_CPU_SB1)        += $(call cc-option,-mno-mips3d)
 187cflags-$(CONFIG_CPU_R10000)     += $(call cc-option,-march=r10000,-march=r8000) \
 188                        -Wa,--trap
 189cflags-$(CONFIG_CPU_CAVIUM_OCTEON) += $(call cc-option,-march=octeon) -Wa,--trap
 190ifeq (,$(findstring march=octeon, $(cflags-$(CONFIG_CPU_CAVIUM_OCTEON))))
 191cflags-$(CONFIG_CPU_CAVIUM_OCTEON) += -Wa,-march=octeon
 192endif
 193cflags-$(CONFIG_CAVIUM_CN63XXP1) += -Wa,-mfix-cn63xxp1
 194cflags-$(CONFIG_CPU_BMIPS)      += -march=mips32 -Wa,-mips32 -Wa,--trap
 195
 196cflags-$(CONFIG_CPU_R4000_WORKAROUNDS)  += $(call cc-option,-mfix-r4000,)
 197cflags-$(CONFIG_CPU_R4400_WORKAROUNDS)  += $(call cc-option,-mfix-r4400,)
 198cflags-$(CONFIG_CPU_DADDI_WORKAROUNDS)  += $(call cc-option,-mno-daddi,)
 199
 200# For smartmips configurations, there are hundreds of warnings due to ISA overrides
 201# in assembly and header files. smartmips is only supported for MIPS32r1 onwards
 202# and there is no support for 64-bit. Various '.set mips2' or '.set mips3' or
 203# similar directives in the kernel will spam the build logs with the following warnings:
 204# Warning: the `smartmips' extension requires MIPS32 revision 1 or greater
 205# or
 206# Warning: the 64-bit MIPS architecture does not support the `smartmips' extension
 207# Pass -Wa,--no-warn to disable all assembler warnings until the kernel code has
 208# been fixed properly.
 209mips-cflags                             := $(cflags-y)
 210ifeq ($(CONFIG_CPU_HAS_SMARTMIPS),y)
 211smartmips-ase                           := $(call cc-option-yn,$(mips-cflags) -msmartmips)
 212cflags-$(smartmips-ase)                 += -msmartmips -Wa,--no-warn
 213endif
 214ifeq ($(CONFIG_CPU_MICROMIPS),y)
 215micromips-ase                           := $(call cc-option-yn,$(mips-cflags) -mmicromips)
 216cflags-$(micromips-ase)                 += -mmicromips
 217endif
 218ifeq ($(CONFIG_CPU_HAS_MSA),y)
 219toolchain-msa                           := $(call cc-option-yn,$(mips-cflags) -mhard-float -mfp64 -Wa$(comma)-mmsa)
 220cflags-$(toolchain-msa)                 += -DTOOLCHAIN_SUPPORTS_MSA
 221endif
 222toolchain-virt                          := $(call cc-option-yn,$(mips-cflags) -mvirt)
 223cflags-$(toolchain-virt)                += -DTOOLCHAIN_SUPPORTS_VIRT
 224# For -mmicromips, use -Wa,-fatal-warnings to catch unsupported -mxpa which
 225# only warns
 226xpa-cflags-y                            := $(mips-cflags)
 227xpa-cflags-$(micromips-ase)             += -mmicromips -Wa$(comma)-fatal-warnings
 228toolchain-xpa                           := $(call cc-option-yn,$(xpa-cflags-y) -mxpa)
 229cflags-$(toolchain-xpa)                 += -DTOOLCHAIN_SUPPORTS_XPA
 230toolchain-crc                           := $(call cc-option-yn,$(mips-cflags) -Wa$(comma)-mcrc)
 231cflags-$(toolchain-crc)                 += -DTOOLCHAIN_SUPPORTS_CRC
 232toolchain-dsp                           := $(call cc-option-yn,$(mips-cflags) -Wa$(comma)-mdsp)
 233cflags-$(toolchain-dsp)                 += -DTOOLCHAIN_SUPPORTS_DSP
 234toolchain-ginv                          := $(call cc-option-yn,$(mips-cflags) -Wa$(comma)-mginv)
 235cflags-$(toolchain-ginv)                += -DTOOLCHAIN_SUPPORTS_GINV
 236
 237#
 238# Firmware support
 239#
 240libs-$(CONFIG_FW_ARC)           += arch/mips/fw/arc/
 241libs-$(CONFIG_FW_CFE)           += arch/mips/fw/cfe/
 242libs-$(CONFIG_FW_SNIPROM)       += arch/mips/fw/sni/
 243libs-y                          += arch/mips/fw/lib/
 244
 245#
 246# Kernel compression
 247#
 248ifdef CONFIG_SYS_SUPPORTS_ZBOOT
 249COMPRESSION_FNAME               = vmlinuz
 250else
 251COMPRESSION_FNAME               = vmlinux
 252endif
 253
 254#
 255# Board-dependent options and extra files
 256#
 257include arch/mips/Kbuild.platforms
 258
 259ifdef CONFIG_PHYSICAL_START
 260load-y                                  = $(CONFIG_PHYSICAL_START)
 261endif
 262
 263entry-y                         = $(shell $(objtree)/arch/mips/tools/elf-entry vmlinux)
 264cflags-y                        += -I$(srctree)/arch/mips/include/asm/mach-generic
 265drivers-$(CONFIG_PCI)           += arch/mips/pci/
 266
 267#
 268# Automatically detect the build format. By default we choose
 269# the elf format according to the load address.
 270# We can always force a build with a 64-bits symbol format by
 271# passing 'KBUILD_SYM32=no' option to the make's command line.
 272#
 273ifdef CONFIG_64BIT
 274  ifndef KBUILD_SYM32
 275    ifeq ($(shell expr $(load-y) \< 0xffffffff80000000), 0)
 276      KBUILD_SYM32 = y
 277    endif
 278  endif
 279
 280  ifeq ($(KBUILD_SYM32)$(call cc-option-yn,-msym32), yy)
 281    cflags-y += -msym32 -DKBUILD_64BIT_SYM32
 282  else
 283    ifeq ($(CONFIG_CPU_DADDI_WORKAROUNDS), y)
 284      $(error CONFIG_CPU_DADDI_WORKAROUNDS unsupported without -msym32)
 285    endif
 286  endif
 287endif
 288
 289# When linking a 32-bit executable the LLVM linker cannot cope with a
 290# 32-bit load address that has been sign-extended to 64 bits.  Simply
 291# remove the upper 32 bits then, as it is safe to do so with other
 292# linkers.
 293ifdef CONFIG_64BIT
 294        load-ld                 = $(load-y)
 295else
 296        load-ld                 = $(subst 0xffffffff,0x,$(load-y))
 297endif
 298
 299KBUILD_AFLAGS   += $(cflags-y)
 300KBUILD_CFLAGS   += $(cflags-y)
 301KBUILD_CPPFLAGS += -DVMLINUX_LOAD_ADDRESS=$(load-y) -DLINKER_LOAD_ADDRESS=$(load-ld)
 302KBUILD_CPPFLAGS += -DDATAOFFSET=$(if $(dataoffset-y),$(dataoffset-y),0)
 303
 304bootvars-y      = VMLINUX_LOAD_ADDRESS=$(load-y) \
 305                  LINKER_LOAD_ADDRESS=$(load-ld) \
 306                  VMLINUX_ENTRY_ADDRESS=$(entry-y) \
 307                  PLATFORM="$(platform-y)" \
 308                  ITS_INPUTS="$(its-y)"
 309ifdef CONFIG_32BIT
 310bootvars-y      += ADDR_BITS=32
 311endif
 312ifdef CONFIG_64BIT
 313bootvars-y      += ADDR_BITS=64
 314endif
 315
 316# This is required to get dwarf unwinding tables into .debug_frame
 317# instead of .eh_frame so we don't discard them.
 318KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
 319
 320KBUILD_LDFLAGS          += -m $(ld-emul)
 321
 322ifdef CONFIG_MIPS
 323CHECKFLAGS += $(shell $(CC) $(KBUILD_CFLAGS) -dM -E -x c /dev/null | \
 324        egrep -vw '__GNUC_(MINOR_|PATCHLEVEL_)?_' | \
 325        sed -e "s/^\#define /-D'/" -e "s/ /'='/" -e "s/$$/'/" -e 's/\$$/&&/g')
 326endif
 327
 328OBJCOPYFLAGS            += --remove-section=.reginfo
 329
 330head-y := arch/mips/kernel/head.o
 331
 332libs-y                  += arch/mips/lib/
 333libs-$(CONFIG_MIPS_FP_SUPPORT) += arch/mips/math-emu/
 334
 335# See arch/mips/Kbuild for content of core part of the kernel
 336core-y += arch/mips/
 337
 338drivers-y                       += arch/mips/crypto/
 339
 340# suspend and hibernation support
 341drivers-$(CONFIG_PM)    += arch/mips/power/
 342
 343# boot image targets (arch/mips/boot/)
 344boot-y                  := vmlinux.bin
 345boot-y                  += vmlinux.ecoff
 346boot-y                  += vmlinux.srec
 347ifeq ($(shell expr $(load-y) \< 0xffffffff80000000 2> /dev/null), 0)
 348boot-y                  += uImage
 349boot-y                  += uImage.bin
 350boot-y                  += uImage.bz2
 351boot-y                  += uImage.gz
 352boot-y                  += uImage.lzma
 353boot-y                  += uImage.lzo
 354endif
 355boot-y                  += vmlinux.itb
 356boot-y                  += vmlinux.gz.itb
 357boot-y                  += vmlinux.bz2.itb
 358boot-y                  += vmlinux.lzma.itb
 359boot-y                  += vmlinux.lzo.itb
 360
 361# compressed boot image targets (arch/mips/boot/compressed/)
 362bootz-y                 := vmlinuz
 363bootz-y                 += vmlinuz.bin
 364bootz-y                 += vmlinuz.ecoff
 365bootz-y                 += vmlinuz.srec
 366ifeq ($(shell expr $(zload-y) \< 0xffffffff80000000 2> /dev/null), 0)
 367bootz-y                 += uzImage.bin
 368endif
 369bootz-y                 += vmlinuz.itb
 370
 371#
 372# Some machines like the Indy need 32-bit ELF binaries for booting purposes.
 373# Other need ECOFF, so we build a 32-bit ELF binary for them which we then
 374# convert to ECOFF using elf2ecoff.
 375#
 376quiet_cmd_32 = OBJCOPY $@
 377        cmd_32 = $(OBJCOPY) -O $(32bit-bfd) $(OBJCOPYFLAGS) $< $@
 378vmlinux.32: vmlinux
 379        $(call cmd,32)
 380
 381#
 382# The 64-bit ELF tools are pretty broken so at this time we generate 64-bit
 383# ELF files from 32-bit files by conversion.
 384#
 385quiet_cmd_64 = OBJCOPY $@
 386        cmd_64 = $(OBJCOPY) -O $(64bit-bfd) $(OBJCOPYFLAGS) $< $@
 387vmlinux.64: vmlinux
 388        $(call cmd,64)
 389
 390all:    $(all-y) $(KBUILD_DTBS)
 391
 392# boot
 393$(boot-y): $(vmlinux-32) FORCE
 394        $(Q)$(MAKE) $(build)=arch/mips/boot VMLINUX=$(vmlinux-32) \
 395                $(bootvars-y) arch/mips/boot/$@
 396
 397ifdef CONFIG_SYS_SUPPORTS_ZBOOT
 398# boot/compressed
 399$(bootz-y): $(vmlinux-32) FORCE
 400        $(Q)$(MAKE) $(build)=arch/mips/boot/compressed \
 401                $(bootvars-y) 32bit-bfd=$(32bit-bfd) arch/mips/boot/$@
 402else
 403vmlinuz: FORCE
 404        @echo '   CONFIG_SYS_SUPPORTS_ZBOOT is not enabled'
 405        /bin/false
 406endif
 407
 408
 409CLEAN_FILES += vmlinux.32 vmlinux.64
 410
 411# device-trees
 412core-y += arch/mips/boot/dts/
 413
 414archprepare:
 415ifdef CONFIG_MIPS32_N32
 416        @$(kecho) '  Checking missing-syscalls for N32'
 417        $(Q)$(MAKE) $(build)=. missing-syscalls missing_syscalls_flags="-mabi=n32"
 418endif
 419ifdef CONFIG_MIPS32_O32
 420        @$(kecho) '  Checking missing-syscalls for O32'
 421        $(Q)$(MAKE) $(build)=. missing-syscalls missing_syscalls_flags="-mabi=32"
 422endif
 423
 424install:
 425        $(Q)install -D -m 755 vmlinux $(INSTALL_PATH)/vmlinux-$(KERNELRELEASE)
 426ifdef CONFIG_SYS_SUPPORTS_ZBOOT
 427        $(Q)install -D -m 755 vmlinuz $(INSTALL_PATH)/vmlinuz-$(KERNELRELEASE)
 428endif
 429        $(Q)install -D -m 644 .config $(INSTALL_PATH)/config-$(KERNELRELEASE)
 430        $(Q)install -D -m 644 System.map $(INSTALL_PATH)/System.map-$(KERNELRELEASE)
 431
 432archclean:
 433        $(Q)$(MAKE) $(clean)=arch/mips/boot
 434        $(Q)$(MAKE) $(clean)=arch/mips/boot/compressed
 435        $(Q)$(MAKE) $(clean)=arch/mips/boot/tools
 436
 437archheaders:
 438        $(Q)$(MAKE) $(build)=arch/mips/kernel/syscalls all
 439
 440define archhelp
 441        echo '  install              - install kernel into $(INSTALL_PATH)'
 442        echo '  vmlinux.ecoff        - ECOFF boot image'
 443        echo '  vmlinux.bin          - Raw binary boot image'
 444        echo '  vmlinux.srec         - SREC boot image'
 445        echo '  vmlinux.32           - 64-bit boot image wrapped in 32bits (IP22/IP32)'
 446        echo '  vmlinuz              - Compressed boot(zboot) image'
 447        echo '  vmlinuz.ecoff        - ECOFF zboot image'
 448        echo '  vmlinuz.bin          - Raw binary zboot image'
 449        echo '  vmlinuz.srec         - SREC zboot image'
 450        echo '  uImage               - U-Boot image'
 451        echo '  uImage.bin           - U-Boot image (uncompressed)'
 452        echo '  uImage.bz2           - U-Boot image (bz2)'
 453        echo '  uImage.gz            - U-Boot image (gzip)'
 454        echo '  uImage.lzma          - U-Boot image (lzma)'
 455        echo '  uImage.lzo           - U-Boot image (lzo)'
 456        echo '  uzImage.bin          - U-Boot image (self-extracting)'
 457        echo
 458        echo '  These will be default as appropriate for a configured platform.'
 459        echo
 460        echo '  If you are targeting a system supported by generic kernels you may'
 461        echo '  configure the kernel for a given architecture target like so:'
 462        echo
 463        echo '  {micro32,32,64}{r1,r2,r6}{el,}_defconfig <BOARDS="list of boards">'
 464        echo
 465        echo '  Where BOARDS is some subset of the following:'
 466        for board in $(sort $(BOARDS)); do echo "    $${board}"; done
 467        echo
 468        echo '  Specifically the following generic default configurations are'
 469        echo '  supported:'
 470        echo
 471        $(foreach cfg,$(generic_defconfigs),
 472          printf "  %-24s - Build generic kernel for $(call describe_generic_defconfig,$(cfg))\n" $(cfg);)
 473        echo
 474        echo '  The following legacy default configurations have been converted to'
 475        echo '  generic and can still be used:'
 476        echo
 477        $(foreach cfg,$(sort $(legacy_defconfigs)),
 478          printf "  %-24s - Build $($(cfg)-y)\n" $(cfg);)
 479        echo
 480        echo '  Otherwise, the following default configurations are available:'
 481endef
 482
 483generic_config_dir = $(srctree)/arch/$(ARCH)/configs/generic
 484generic_defconfigs :=
 485
 486#
 487# If the user generates a generic kernel configuration without specifying a
 488# list of boards to include the config fragments for, default to including all
 489# available board config fragments.
 490#
 491ifeq ($(BOARDS),)
 492BOARDS = $(patsubst board-%.config,%,$(notdir $(wildcard $(generic_config_dir)/board-*.config)))
 493endif
 494
 495#
 496# Generic kernel configurations which merge generic_defconfig with the
 497# appropriate config fragments from arch/mips/configs/generic/, resulting in
 498# the ability to easily configure the kernel for a given architecture,
 499# endianness & set of boards without duplicating the needed configuration in
 500# hundreds of defconfig files.
 501#
 502define gen_generic_defconfigs
 503$(foreach bits,$(1),$(foreach rev,$(2),$(foreach endian,$(3),
 504target := $(bits)$(rev)$(filter el,$(endian))_defconfig
 505generic_defconfigs += $$(target)
 506$$(target): $(generic_config_dir)/$(bits)$(rev).config
 507$$(target): $(generic_config_dir)/$(endian).config
 508)))
 509endef
 510
 511$(eval $(call gen_generic_defconfigs,32 64,r1 r2 r6,eb el))
 512$(eval $(call gen_generic_defconfigs,micro32,r2,eb el))
 513
 514define describe_generic_defconfig
 515$(subst 32r,MIPS32 r,$(subst 64r,MIPS64 r,$(subst el, little endian,$(patsubst %_defconfig,%,$(1)))))
 516endef
 517
 518.PHONY: $(generic_defconfigs)
 519$(generic_defconfigs):
 520        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
 521                -m -O $(objtree) $(srctree)/arch/$(ARCH)/configs/generic_defconfig $^ | \
 522                grep -Ev '^#'
 523        $(Q)cp $(KCONFIG_CONFIG) $(objtree)/.config.$@
 524        $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig \
 525                KCONFIG_CONFIG=$(objtree)/.config.$@ >/dev/null
 526        $(Q)$(CONFIG_SHELL) $(srctree)/arch/$(ARCH)/tools/generic-board-config.sh \
 527                $(srctree) $(objtree) $(objtree)/.config.$@ $(KCONFIG_CONFIG) \
 528                "$(origin BOARDS)" $(BOARDS)
 529        $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
 530
 531#
 532# Prevent generic merge_config rules attempting to merge single fragments
 533#
 534$(generic_config_dir)/%.config: ;
 535
 536#
 537# Prevent direct use of generic_defconfig, which is intended to be used as the
 538# basis of the various ISA-specific targets generated above.
 539#
 540.PHONY: generic_defconfig
 541generic_defconfig:
 542        $(Q)echo "generic_defconfig is not intended for direct use, but should instead be"
 543        $(Q)echo "used via an ISA-specific target from the following list:"
 544        $(Q)echo
 545        $(Q)for cfg in $(generic_defconfigs); do echo "  $${cfg}"; done
 546        $(Q)echo
 547        $(Q)false
 548
 549#
 550# Legacy defconfig compatibility - these targets used to be real defconfigs but
 551# now that the boards have been converted to use the generic kernel they are
 552# wrappers around the generic rules above.
 553#
 554legacy_defconfigs               += ocelot_defconfig
 555ocelot_defconfig-y              := 32r2el_defconfig BOARDS=ocelot
 556
 557legacy_defconfigs               += sead3_defconfig
 558sead3_defconfig-y               := 32r2el_defconfig BOARDS=sead-3
 559
 560legacy_defconfigs               += sead3micro_defconfig
 561sead3micro_defconfig-y          := micro32r2el_defconfig BOARDS=sead-3
 562
 563legacy_defconfigs               += xilfpga_defconfig
 564xilfpga_defconfig-y             := 32r2el_defconfig BOARDS=xilfpga
 565
 566.PHONY: $(legacy_defconfigs)
 567$(legacy_defconfigs):
 568        $(Q)$(MAKE) -f $(srctree)/Makefile $($@-y)
 569