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arm64: enable tlbi range instructions

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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: Zhenyu Ye <yezhenyu2@huawei.com>
Link: https://lore.kernel.org/r/20200715071945.897-3-yezhenyu2@huawei.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Zhenyu Ye 2020-07-15 15:19:44 +08:00 • committed by Catalin Marinas
parent b620ba5454
commit 7c78f67e9b
2 changed files with 21 additions and 0 deletions
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14
arch/arm64/Kconfig
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@ -1596,6 +1596,20 @@ config ARM64_AMU_EXTN
correctly reflect reality. Most commonly, the value read will be 0, correctly reflect reality. Most commonly, the value read will be 0,
indicating that the counter is not enabled. 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 endmenu
menu "ARMv8.5 architectural features" menu "ARMv8.5 architectural features"

7
arch/arm64/Makefile
View file

@ -82,11 +82,18 @@ endif
# compiler to generate them and consequently to break the single image contract # 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 # we pass it only to the assembler. This option is utilized only in case of non
# integrated assemblers. # integrated assemblers.
ifneq ($(CONFIG_AS_HAS_ARMV8_4), y)
branch-prot-flags-$(CONFIG_AS_HAS_PAC) += -Wa,-march=armv8.3-a branch-prot-flags-$(CONFIG_AS_HAS_PAC) += -Wa,-march=armv8.3-a
endif endif
endif
KBUILD_CFLAGS += $(branch-prot-flags-y) 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 ($(CONFIG_SHADOW_CALL_STACK), y) ifeq ($(CONFIG_SHADOW_CALL_STACK), y)
KBUILD_CFLAGS += -ffixed-x18 KBUILD_CFLAGS += -ffixed-x18
endif endif