/* * 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 __HAVE_ARCH_MEMSET #ifndef CONFIG_OPT_LIB_FUNCTION void *memset(void *v_src, int c, __kernel_size_t n) { char *src = v_src; /* Truncate c to 8 bits */ c = (c & 0xFF); /* Simple, byte oriented memset or the rest of count. */ while (n--) *src++ = c; return v_src; } #else /* CONFIG_OPT_LIB_FUNCTION */ void *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; case 2: *src++ = c; --n; 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. */ while (n--) *src++ = c; return v_src; } #endif /* CONFIG_OPT_LIB_FUNCTION */ EXPORT_SYMBOL(memset); #endif /* __HAVE_ARCH_MEMSET */