Commit 7c78f67e authored by Zhenyu Ye's avatar Zhenyu Ye Committed by Catalin Marinas
Browse files

arm64: enable tlbi range instructions 



TLBI RANGE feature instoduces new assembly instructions and only
support by binutils >= 2.30.  Add necessary Kconfig logic to allow
this to be enabled and pass '-march=armv8.4-a' to KBUILD_CFLAGS.

Signed-off-by: default avatarZhenyu Ye <yezhenyu2@huawei.com>
Link: https://lore.kernel.org/r/20200715071945.897-3-yezhenyu2@huawei.com


Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent b620ba54

arch/arm64/Kconfig

+14 −0
Original line number Diff line number Diff line
@@ -1596,6 +1596,20 @@ config ARM64_AMU_EXTN 
	  correctly reflect reality. Most commonly, the value read will be 0,

	  indicating that the counter is not enabled.



config AS_HAS_ARMV8_4

	def_bool $(cc-option,-Wa$(comma)-march=armv8.4-a)



config ARM64_TLB_RANGE

	bool "Enable support for tlbi range feature"

	default y

	depends on AS_HAS_ARMV8_4

	help

	  ARMv8.4-TLBI provides TLBI invalidation instruction that apply to a

	  range of input addresses.



	  The feature introduces new assembly instructions, and they were

	  support when binutils >= 2.30.



endmenu



menu "ARMv8.5 architectural features"

arch/arm64/Makefile

+7 −0
Original line number Diff line number Diff line
@@ -82,11 +82,18 @@ endif 
# compiler to generate them and consequently to break the single image contract

# we pass it only to the assembler. This option is utilized only in case of non

# integrated assemblers.

ifneq ($(CONFIG_AS_HAS_ARMV8_4), y)

branch-prot-flags-$(CONFIG_AS_HAS_PAC) += -Wa,-march=armv8.3-a

endif

endif



KBUILD_CFLAGS += $(branch-prot-flags-y)



ifeq ($(CONFIG_AS_HAS_ARMV8_4), y)

# make sure to pass the newest target architecture to -march.

KBUILD_CFLAGS	+= -Wa,-march=armv8.4-a

endif



ifeq ($(CONFIG_SHADOW_CALL_STACK), y)

KBUILD_CFLAGS	+= -ffixed-x18

endif

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