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arm64/sve: Kconfig update and conditional compilation support

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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: Dave Martin <Dave.Martin@arm.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Dave Martin 2017-10-31 15:51:02 +00:00 committed by Will Deacon
parent 1fc5dce78a
commit ddd25ad1fd
2 changed files with 16 additions and 0 deletions
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11
arch/arm64/Kconfig
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@ -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

5
arch/arm64/include/asm/cpufeature.h
View File

@ -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