blob: 8f730fe700936e7621974a71dfbec7b94ae535ec [file] [log] [blame]
* linux/arch/arm/include/asm/neon.h
* Copyright (C) 2013 Linaro Ltd <>
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
#include <asm/hwcap.h>
#define cpu_has_neon() (!!(elf_hwcap & HWCAP_NEON))
#ifdef __ARM_NEON__
* If you are affected by the BUILD_BUG below, it probably means that you are
* using NEON code /and/ calling the kernel_neon_begin() function from the same
* compilation unit. To prevent issues that may arise from GCC reordering or
* generating(1) NEON instructions outside of these begin/end functions, the
* only supported way of using NEON code in the kernel is by isolating it in a
* separate compilation unit, and calling it from another unit from inside a
* kernel_neon_begin/kernel_neon_end pair.
* (1) Current GCC (4.7) might generate NEON instructions at O3 level if
* -mpfu=neon is set.
#define kernel_neon_begin() \
BUILD_BUG_ON_MSG(1, "kernel_neon_begin() called from NEON code")
void kernel_neon_begin(void);
void kernel_neon_end(void);