/* * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> * Copyright (C) 2008-2009 PetaLogix * Copyright (C) 2007 John Williams * * Reasonably optimised generic C-code for memset on Microblaze * This is generic C code to do efficient, alignment-aware memcpy. * * It is based on demo code originally Copyright 2001 by Intel Corp, taken from * http://www.embedded.com/showArticle.jhtml?articleID=19205567 * * Attempts were made, unsuccessfully, to contact the original * author of this code (Michael Morrow, Intel).  Below is the original * copyright notice. * * This software has been developed by Intel Corporation. * Intel specifically disclaims all warranties, express or * implied, and all liability, including consequential and * other indirect damages, for the use of this program, including * liability for infringement of any proprietary rights, * and including the warranties of merchantability and fitness * for a particular purpose. Intel does not assume any * responsibility for and errors which may appear in this program * not any responsibility to update it. */ #include <linux/export.h>#include <linux/types.h>#include <linux/stddef.h>#include <linux/compiler.h>#include <linux/string.h> #ifdef CONFIG_OPT_LIB_FUNCTIONvoid *memset(void *v_src, int c, __kernel_size_t n){	char *src = v_src;	uint32_t *i_src;	uint32_t w32 = 0; 	/* Truncate c to 8 bits */	c = (c & 0xFF); 	if (unlikely(c)) {		/* Make a repeating word out of it */		w32 = c;		w32 |= w32 << 8;		w32 |= w32 << 16;	} 	if (likely(n >= 4)) {		/* Align the destination to a word boundary */		/* This is done in an endian independent manner */		switch ((unsigned) src & 3) {		case 1:			*src++ = c;			--n;			fallthrough;		case 2:			*src++ = c;			--n;			fallthrough;		case 3:			*src++ = c;			--n;		} 		i_src  = (void *)src; 		/* Do as many full-word copies as we can */		for (; n >= 4; n -= 4)			*i_src++ = w32; 		src  = (void *)i_src;	} 	/* Simple, byte oriented memset or the rest of count. */	switch (n) {	case 3:		*src++ = c;		fallthrough;	case 2:		*src++ = c;		fallthrough;	case 1:		*src++ = c;		break;	default:		break;	} 	return v_src;}EXPORT_SYMBOL(memset);#endif /* CONFIG_OPT_LIB_FUNCTION */