add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/riscv/Kconfig
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@@ -22,6 +22,7 @@
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 	select ARCH_HAS_GIGANTIC_PAGE
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 	select ARCH_HAS_KCOV
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 	select ARCH_HAS_MMIOWB
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+	select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
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 	select ARCH_HAS_PTE_SPECIAL
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 	select ARCH_HAS_SET_DIRECT_MAP
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 	select ARCH_HAS_SET_MEMORY
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@@ -331,6 +332,28 @@
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 endmenu
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+config TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI
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+	def_bool y
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+	# https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=aed44286efa8ae8717a77d94b51ac3614e2ca6dc
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+	depends on AS_IS_GNU && AS_VERSION >= 23800
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+	help
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+	  Newer binutils versions default to ISA spec version 20191213 which
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+	  moves some instructions from the I extension to the Zicsr and Zifencei
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+	  extensions.
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+
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+config TOOLCHAIN_NEEDS_OLD_ISA_SPEC
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+	def_bool y
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+	depends on TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI
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+	# https://github.com/llvm/llvm-project/commit/22e199e6afb1263c943c0c0d4498694e15bf8a16
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+	depends on CC_IS_CLANG && CLANG_VERSION < 170000
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+	help
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+	  Certain versions of clang do not support zicsr and zifencei via -march
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+	  but newer versions of binutils require it for the reasons noted in the
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+	  help text of CONFIG_TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI. This
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+	  option causes an older ISA spec compatible with these older versions
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+	  of clang to be passed to GAS, which has the same result as passing zicsr
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+	  and zifencei to -march.
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+
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 config FPU
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 	bool "FPU support"
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 	default y