/*
|
* 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 */
|
