diff options
| author |   Dave Martin <Dave.Martin@arm.com> | 2017-10-31 15:51:01 +0000 |
|---|---|---|
| committer |   Will Deacon <will.deacon@arm.com> | 2017-11-03 15:24:14 +0000 |
| commit | 1fc5dce78ad15dce2f23336d339e5f7290b61e19 (patch) | |
| tree | 3718014c2a1531441a25339d2d32a5cd0cb7e0ad /arch/arm64/include/asm/fpsimd.h | |
| parent | arm64/sve: System register and exception syndrome definitions (diff) | |
| download | linux-dev-1fc5dce78ad15dce2f23336d339e5f7290b61e19.tar.xz linux-dev-1fc5dce78ad15dce2f23336d339e5f7290b61e19.zip | |
arm64/sve: Low-level SVE architectural state manipulation functions
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>
Diffstat (limited to 'arch/arm64/include/asm/fpsimd.h')
| -rw-r--r-- | arch/arm64/include/asm/fpsimd.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/fpsimd.h b/arch/arm64/include/asm/fpsimd.h index 410c48163c6a..026a7c7fc30b 100644 --- a/arch/arm64/include/asm/fpsimd.h +++ b/arch/arm64/include/asm/fpsimd.h @@ -67,6 +67,11 @@ extern void fpsimd_update_current_state(struct fpsimd_state *state); extern void fpsimd_flush_task_state(struct task_struct *target); +extern void sve_save_state(void *state, u32 *pfpsr); +extern void sve_load_state(void const *state, u32 const *pfpsr, + unsigned long vq_minus_1); +extern unsigned int sve_get_vl(void); + /* For use by EFI runtime services calls only */ extern void __efi_fpsimd_begin(void); extern void __efi_fpsimd_end(void); |