[mirror_ubuntu-bionic-kernel.git] / arch / microblaze / lib / memset.c

/*
 * 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/types.h>
#include <linux/stddef.h>
#include <linux/compiler.h>
#include <linux/module.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 */
Commit	Line	Data
322ae8eb MS	1	/*
	2	* Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
	3	* Copyright (C) 2008-2009 PetaLogix
	4	* Copyright (C) 2007 John Williams
	5	*
	6	* Reasonably optimised generic C-code for memset on Microblaze
	7	* This is generic C code to do efficient, alignment-aware memcpy.
	8	*
	9	* It is based on demo code originally Copyright 2001 by Intel Corp, taken from
	10	* http://www.embedded.com/showArticle.jhtml?articleID=19205567
	11	*
af901ca1	12	* Attempts were made, unsuccessfully, to contact the original
322ae8eb MS	13	* author of this code (Michael Morrow, Intel). Below is the original
	14	* copyright notice.
	15	*
	16	* This software has been developed by Intel Corporation.
	17	* Intel specifically disclaims all warranties, express or
	18	* implied, and all liability, including consequential and
	19	* other indirect damages, for the use of this program, including
	20	* liability for infringement of any proprietary rights,
	21	* and including the warranties of merchantability and fitness
	22	* for a particular purpose. Intel does not assume any
	23	* responsibility for and errors which may appear in this program
	24	* not any responsibility to update it.
	25	*/
	26
	27	#include <linux/types.h>
	28	#include <linux/stddef.h>
	29	#include <linux/compiler.h>
	30	#include <linux/module.h>
	31	#include <linux/string.h>
	32
	33	#ifdef __HAVE_ARCH_MEMSET
93e2e851 MS	34	#ifndef CONFIG_OPT_LIB_FUNCTION
	35	void memset(void v_src, int c, __kernel_size_t n)
	36	{
	37	char *src = v_src;
	38
	39	/* Truncate c to 8 bits */
	40	c = (c & 0xFF);
	41
	42	/* Simple, byte oriented memset or the rest of count. */
	43	while (n--)
	44	*src++ = c;
	45
	46	return v_src;
	47	}
	48	#else /* CONFIG_OPT_LIB_FUNCTION */
322ae8eb MS	49	void memset(void v_src, int c, __kernel_size_t n)
322ae8eb MS	50	{
322ae8eb	51	char *src = v_src;
322ae8eb	52	uint32_t *i_src;
78ebfa88	53	uint32_t w32 = 0;
93e2e851	54
322ae8eb MS	55	/* Truncate c to 8 bits */
	56	c = (c & 0xFF);
	57
78ebfa88 MS	58	if (unlikely(c)) {
	59	/* Make a repeating word out of it */
	60	w32 = c;
	61	w32 \|= w32 << 8;
	62	w32 \|= w32 << 16;
	63	}
322ae8eb	64
78ebfa88	65	if (likely(n >= 4)) {
322ae8eb	66	/* Align the destination to a word boundary */
25985edc	67	/* This is done in an endian independent manner */
322ae8eb MS	68	switch ((unsigned) src & 3) {
	69	case 1:
	70	*src++ = c;
	71	--n;
	72	case 2:
	73	*src++ = c;
	74	--n;
	75	case 3:
	76	*src++ = c;
	77	--n;
	78	}
	79
	80	i_src = (void *)src;
	81
	82	/* Do as many full-word copies as we can */
	83	for (; n >= 4; n -= 4)
	84	*i_src++ = w32;
	85
	86	src = (void *)i_src;
	87	}
93e2e851	88
322ae8eb MS	89	/* Simple, byte oriented memset or the rest of count. */
	90	while (n--)
	91	*src++ = c;
	92
	93	return v_src;
	94	}
93e2e851	95	#endif /* CONFIG_OPT_LIB_FUNCTION */
322ae8eb MS	96	EXPORT_SYMBOL(memset);
322ae8eb MS	97	#endif /* __HAVE_ARCH_MEMSET */