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Commit ddd25ad1 authored by Dave Martin's avatar Dave Martin Committed by Will Deacon
Browse files

arm64/sve: Kconfig update and conditional compilation support 



This patch adds CONFIG_ARM64_SVE to control building of SVE support
into the kernel, and adds a stub predicate system_supports_sve() to
control conditional compilation and runtime SVE support.

system_supports_sve() just returns false for now: it will be
replaced with a non-trivial implementation in a later patch, once
SVE support is complete enough to be enabled safely.

Signed-off-by: default avatarDave Martin <Dave.Martin@arm.com>
Reviewed-by: default avatarAlex Bennée <alex.bennee@linaro.org>
Reviewed-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent 1fc5dce7

arch/arm64/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -976,6 +976,17 @@ config ARM64_PMEM 


endmenu



config ARM64_SVE

	bool "ARM Scalable Vector Extension support"

	default y

	help

	  The Scalable Vector Extension (SVE) is an extension to the AArch64

	  execution state which complements and extends the SIMD functionality

	  of the base architecture to support much larger vectors and to enable

	  additional vectorisation opportunities.



	  To enable use of this extension on CPUs that implement it, say Y.



config ARM64_MODULE_CMODEL_LARGE

	bool

arch/arm64/include/asm/cpufeature.h

+5 −0
Original line number Diff line number Diff line
@@ -262,6 +262,11 @@ static inline bool system_uses_ttbr0_pan(void) 
		!cpus_have_const_cap(ARM64_HAS_PAN);

}



static inline bool system_supports_sve(void)

{

	return false;

}



#endif /* __ASSEMBLY__ */



#endif