/* * linux/lib/raid6/neon.c - RAID6 syndrome calculation using ARM NEON intrinsics * * 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 <linux/raid/pq.h> #ifdef __KERNEL__#include <asm/neon.h>#else#define kernel_neon_begin()#define kernel_neon_end()#define cpu_has_neon()		(1)#endif /* * There are 2 reasons these wrappers are kept in a separate compilation unit * from the actual implementations in neonN.c (generated from neon.uc by * unroll.awk): * - the actual implementations use NEON intrinsics, and the GCC support header *   (arm_neon.h) is not fully compatible (type wise) with the kernel; * - the neonN.c files are compiled with -mfpu=neon and optimization enabled, *   and we have to make sure that we never use *any* NEON/VFP instructions *   outside a kernel_neon_begin()/kernel_neon_end() pair. */ #define RAID6_NEON_WRAPPER(_n)						\	static void raid6_neon ## _n ## _gen_syndrome(int disks,	\					size_t bytes, void **ptrs)	\	{								\		void raid6_neon ## _n  ## _gen_syndrome_real(int,	\						unsigned long, void**);	\		kernel_neon_begin();					\		raid6_neon ## _n ## _gen_syndrome_real(disks,		\					(unsigned long)bytes, ptrs);	\		kernel_neon_end();					\	}								\	struct raid6_calls const raid6_neonx ## _n = {			\		raid6_neon ## _n ## _gen_syndrome,			\		raid6_have_neon,					\		"neonx" #_n,						\		0							\	} static int raid6_have_neon(void){	return cpu_has_neon();} RAID6_NEON_WRAPPER(1);RAID6_NEON_WRAPPER(2);RAID6_NEON_WRAPPER(4);RAID6_NEON_WRAPPER(8);