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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/m68k/lib/memset.c
10817 views
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/*

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 * This file is subject to the terms and conditions of the GNU General Public

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 * License.  See the file COPYING in the main directory of this archive

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 * for more details.

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 */

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#include <linux/module.h>

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#include <linux/string.h>

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void *memset(void *s, int c, size_t count)

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{

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	void *xs = s;

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	size_t temp;

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	if (!count)

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		return xs;

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	c &= 0xff;

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	c |= c << 8;

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	c |= c << 16;

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	if ((long)s & 1) {

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		char *cs = s;

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		*cs++ = c;

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		s = cs;

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		count--;

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	}

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	if (count > 2 && (long)s & 2) {

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		short *ss = s;

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		*ss++ = c;

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		s = ss;

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		count -= 2;

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	}

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	temp = count >> 2;

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	if (temp) {

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		long *ls = s;

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#if defined(CONFIG_M68000) || defined(CONFIG_COLDFIRE)

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		for (; temp; temp--)

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			*ls++ = c;

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#else

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		size_t temp1;

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		asm volatile (

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			"	movel %1,%2\n"

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			"	andw  #7,%2\n"

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			"	lsrl  #3,%1\n"

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			"	negw  %2\n"

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			"	jmp   %%pc@(2f,%2:w:2)\n"

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			"1:	movel %3,%0@+\n"

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			"	movel %3,%0@+\n"

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			"	movel %3,%0@+\n"

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			"	movel %3,%0@+\n"

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			"	movel %3,%0@+\n"

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			"	movel %3,%0@+\n"

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			"	movel %3,%0@+\n"

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			"	movel %3,%0@+\n"

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			"2:	dbra  %1,1b\n"

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			"	clrw  %1\n"

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			"	subql #1,%1\n"

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			"	jpl   1b"

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			: "=a" (ls), "=d" (temp), "=&d" (temp1)

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			: "d" (c), "0" (ls), "1" (temp));

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#endif

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		s = ls;

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	}

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	if (count & 2) {

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		short *ss = s;

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		*ss++ = c;

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		s = ss;

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	}

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	if (count & 1) {

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		char *cs = s;

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		*cs = c;

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	}

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	return xs;

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}

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EXPORT_SYMBOL(memset);

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