75 lines
1.3 KiB
C
75 lines
1.3 KiB
C
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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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