xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

arm64/sve: Low-level SVE architectural state manipulation functions

Browse Source 
Manipulating the SVE architectural state, including the vector and
predicate registers, first-fault register and the vector length,
requires the use of dedicated instructions added by SVE.

This patch adds suitable assembly functions for saving and
restoring the SVE registers and querying the vector length.
Setting of the vector length is done as part of register restore.

Since people building kernels may not all get an SVE-enabled
toolchain for a while, this patch uses macros that generate
explicit opcodes in place of assembler mnemonics.

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Acked-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 15:51:01 +00:00
committed by Will Deacon
parent 672365649c
commit 1fc5dce78a
3 changed files with 170 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
arch/arm64/kernel/entry-fpsimd.S
View File

@@ -41,3 +41,20 @@ ENTRY(fpsimd_load_state)
fpsimd_restore x0, 8
ret
ENDPROC(fpsimd_load_state)
#ifdef CONFIG_ARM64_SVE
ENTRY(sve_save_state)
sve_save 0, x1, 2
ret
ENDPROC(sve_save_state)
ENTRY(sve_load_state)
sve_load 0, x1, x2, 3
ret
ENDPROC(sve_load_state)
ENTRY(sve_get_vl)
_sve_rdvl 0, 1
ret
ENDPROC(sve_get_vl)
#endif /* CONFIG_ARM64_SVE */