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- /* SPDX-License-Identifier: GPL-2.0-only */
- /*
- * linux/arch/arm/include/asm/neon.h
- *
- * Copyright (C) 2013 Linaro Ltd <[email protected]>
- */
- #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")
- #else
- void kernel_neon_begin(void);
- #endif
- void kernel_neon_end(void);
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