/*
   * linux/arch/arm/include/asm/neon.h
   *
   * Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org>
   *
   * 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")
  
  #else
  void kernel_neon_begin(void);
  #endif
  void kernel_neon_end(void);