1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file COPYING in the main directory of this archive 4 * for more details. 5 */ 6 7 #include <linux/module.h> 8 #include <linux/string.h> 9 10 void *memset(void *s, int c, size_t count) 11 { 12 void *xs = s; 13 size_t temp; 14 15 if (!count) 16 return xs; 17 c &= 0xff; 18 c |= c << 8; 19 c |= c << 16; 20 if ((long)s & 1) { 21 char *cs = s; 22 *cs++ = c; 23 s = cs; 24 count--; 25 } 26 if (count > 2 && (long)s & 2) { 27 short *ss = s; 28 *ss++ = c; 29 s = ss; 30 count -= 2; 31 } 32 temp = count >> 2; 33 if (temp) { 34 long *ls = s; 35 #if defined(__mc68020__) || defined(__mc68030__) || \ 36 defined(__mc68040__) || defined(__mc68060__) || defined(__mcpu32__) 37 size_t temp1; 38 asm volatile ( 39 " movel %1,%2\n" 40 " andw #7,%2\n" 41 " lsrl #3,%1\n" 42 " negw %2\n" 43 " jmp %%pc@(2f,%2:w:2)\n" 44 "1: movel %3,%0@+\n" 45 " movel %3,%0@+\n" 46 " movel %3,%0@+\n" 47 " movel %3,%0@+\n" 48 " movel %3,%0@+\n" 49 " movel %3,%0@+\n" 50 " movel %3,%0@+\n" 51 " movel %3,%0@+\n" 52 "2: dbra %1,1b\n" 53 " clrw %1\n" 54 " subql #1,%1\n" 55 " jpl 1b" 56 : "=a" (ls), "=d" (temp), "=&d" (temp1) 57 : "d" (c), "0" (ls), "1" (temp)); 58 #else 59 for (; temp; temp--) 60 *ls++ = c; 61 #endif 62 s = ls; 63 } 64 if (count & 2) { 65 short *ss = s; 66 *ss++ = c; 67 s = ss; 68 } 69 if (count & 1) { 70 char *cs = s; 71 *cs = c; 72 } 73 return xs; 74 } 75 EXPORT_SYMBOL(memset); 76