arch/mips/loongson2ef/Platform

#
# Loongson Processors' Support
#

# Only gcc >= 4.4 have Loongson specific support
cflags-$(CONFIG_CPU_LOONGSON2EF)	+= -Wa,--trap
cflags-$(CONFIG_CPU_LOONGSON2E) += \
	$(call cc-option,-march=loongson2e,-march=r4600)
cflags-$(CONFIG_CPU_LOONGSON2F) += \
	$(call cc-option,-march=loongson2f,-march=r4600)
#
# Some versions of binutils, not currently mainline as of 2019/02/04, support
# an -mfix-loongson3-llsc flag which emits a sync prior to each ll instruction
# to work around a CPU bug (see __SYNC_loongson3_war in asm/sync.h for a
# description).
#
# We disable this in order to prevent the assembler meddling with the
# instruction that labels refer to, ie. if we label an ll instruction:
#
# 1: ll v0, 0(a0)
#
# ...then with the assembler fix applied the label may actually point at a sync
# instruction inserted by the assembler, and if we were using the label in an
# exception table the table would no longer contain the address of the ll
# instruction.
#
# Avoid this by explicitly disabling that assembler behaviour. If upstream
# binutils does not merge support for the flag then we can revisit & remove
# this later - for now it ensures vendor toolchains don't cause problems.
#
cflags-$(CONFIG_CPU_LOONGSON2EF)	+= $(call as-option,-Wa$(comma)-mno-fix-loongson3-llsc,)

# Enable the workarounds for Loongson2f
ifdef CONFIG_CPU_LOONGSON2F_WORKAROUNDS
  ifeq ($(call as-option,-Wa$(comma)-mfix-loongson2f-nop,),)
    $(error only binutils >= 2.20.2 have needed option -mfix-loongson2f-nop)
  else
    cflags-$(CONFIG_CPU_NOP_WORKAROUNDS) += -Wa$(comma)-mfix-loongson2f-nop
  endif
  ifeq ($(call as-option,-Wa$(comma)-mfix-loongson2f-jump,),)
    $(error only binutils >= 2.20.2 have needed option -mfix-loongson2f-jump)
  else
    cflags-$(CONFIG_CPU_JUMP_WORKAROUNDS) += -Wa$(comma)-mfix-loongson2f-jump
  endif
endif

# Some -march= flags enable MMI instructions, and GCC complains about that
# support being enabled alongside -msoft-float. Thus explicitly disable MMI.
cflags-y += $(call cc-option,-mno-loongson-mmi)

#
# Loongson Machines' Support
#

cflags-$(CONFIG_MACH_LOONGSON2EF) += -I$(srctree)/arch/mips/include/asm/mach-loongson2ef -mno-branch-likely
load-$(CONFIG_LEMOTE_FULOONG2E) += 0xffffffff80100000
load-$(CONFIG_LEMOTE_MACH2F) += 0xffffffff80200000