diff options
| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2014-02-24 15:26:29 +0100 |
|---|---|---|
| committer | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2014-05-08 11:31:57 +0200 |
| commit | 190f1ca85d071114930dd7abe6b5d103e9d5572f (patch) | |
| tree | 27344d61659e775df00892c8a13ae2473aad29b1 /arch/arm64/include/asm/fpsimd.h | |
| parent | 005f78cd88494457ed38ce817f4e3fe5d372f0cb (diff) | |
arm64: add support for kernel mode NEON in interrupt context
This patch modifies kernel_neon_begin() and kernel_neon_end(), so
they may be called from any context. To address the case where only
a couple of registers are needed, kernel_neon_begin_partial(u32) is
introduced which takes as a parameter the number of bottom 'n' NEON
q-registers required. To mark the end of such a partial section, the
regular kernel_neon_end() should be used.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Diffstat (limited to 'arch/arm64/include/asm/fpsimd.h')
| -rw-r--r-- | arch/arm64/include/asm/fpsimd.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/fpsimd.h b/arch/arm64/include/asm/fpsimd.h index 7a900142dbc8..50f559f574fe 100644 --- a/arch/arm64/include/asm/fpsimd.h +++ b/arch/arm64/include/asm/fpsimd.h @@ -41,6 +41,17 @@ struct fpsimd_state { unsigned int cpu; }; +/* + * Struct for stacking the bottom 'n' FP/SIMD registers. + */ +struct fpsimd_partial_state { + u32 fpsr; + u32 fpcr; + u32 num_regs; + __uint128_t vregs[32]; +}; + + #if defined(__KERNEL__) && defined(CONFIG_COMPAT) /* Masks for extracting the FPSR and FPCR from the FPSCR */ #define VFP_FPSCR_STAT_MASK 0xf800009f @@ -66,6 +77,10 @@ extern void fpsimd_update_current_state(struct fpsimd_state *state); extern void fpsimd_flush_task_state(struct task_struct *target); +extern void fpsimd_save_partial_state(struct fpsimd_partial_state *state, + u32 num_regs); +extern void fpsimd_load_partial_state(struct fpsimd_partial_state *state); + #endif #endif |