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Subject[PATCH v3 2/3] arm64: enable tlbi range instructions
Date
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>
---
arch/arm64/Kconfig | 14 ++++++++++++++
arch/arm64/Makefile | 7 +++++++
2 files changed, 21 insertions(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 66dc41fd49f2..e385361f8137 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -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 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.
+
+config AS_HAS_ARMV8_4
+ def_bool $(cc-option, -Wa$(comma)-march=armv8.4-a)
+
endmenu

menu "ARMv8.5 architectural features"
diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index a0d94d063fa8..4e823b97c92e 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -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
--
2.19.1

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