1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * This file is subject to the terms and conditions of the GNU General Public
3*4882a593Smuzhiyun * License. See the file COPYING in the main directory of this archive
4*4882a593Smuzhiyun * for more details.
5*4882a593Smuzhiyun */
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #include <linux/module.h>
8*4882a593Smuzhiyun #include <linux/string.h>
9*4882a593Smuzhiyun
memcpy(void * to,const void * from,size_t n)10*4882a593Smuzhiyun void *memcpy(void *to, const void *from, size_t n)
11*4882a593Smuzhiyun {
12*4882a593Smuzhiyun void *xto = to;
13*4882a593Smuzhiyun size_t temp;
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun if (!n)
16*4882a593Smuzhiyun return xto;
17*4882a593Smuzhiyun if ((long)to & 1) {
18*4882a593Smuzhiyun char *cto = to;
19*4882a593Smuzhiyun const char *cfrom = from;
20*4882a593Smuzhiyun *cto++ = *cfrom++;
21*4882a593Smuzhiyun to = cto;
22*4882a593Smuzhiyun from = cfrom;
23*4882a593Smuzhiyun n--;
24*4882a593Smuzhiyun }
25*4882a593Smuzhiyun #if defined(CONFIG_M68000)
26*4882a593Smuzhiyun if ((long)from & 1) {
27*4882a593Smuzhiyun char *cto = to;
28*4882a593Smuzhiyun const char *cfrom = from;
29*4882a593Smuzhiyun for (; n; n--)
30*4882a593Smuzhiyun *cto++ = *cfrom++;
31*4882a593Smuzhiyun return xto;
32*4882a593Smuzhiyun }
33*4882a593Smuzhiyun #endif
34*4882a593Smuzhiyun if (n > 2 && (long)to & 2) {
35*4882a593Smuzhiyun short *sto = to;
36*4882a593Smuzhiyun const short *sfrom = from;
37*4882a593Smuzhiyun *sto++ = *sfrom++;
38*4882a593Smuzhiyun to = sto;
39*4882a593Smuzhiyun from = sfrom;
40*4882a593Smuzhiyun n -= 2;
41*4882a593Smuzhiyun }
42*4882a593Smuzhiyun temp = n >> 2;
43*4882a593Smuzhiyun if (temp) {
44*4882a593Smuzhiyun long *lto = to;
45*4882a593Smuzhiyun const long *lfrom = from;
46*4882a593Smuzhiyun #if defined(CONFIG_M68000) || defined(CONFIG_COLDFIRE)
47*4882a593Smuzhiyun for (; temp; temp--)
48*4882a593Smuzhiyun *lto++ = *lfrom++;
49*4882a593Smuzhiyun #else
50*4882a593Smuzhiyun size_t temp1;
51*4882a593Smuzhiyun asm volatile (
52*4882a593Smuzhiyun " movel %2,%3\n"
53*4882a593Smuzhiyun " andw #7,%3\n"
54*4882a593Smuzhiyun " lsrl #3,%2\n"
55*4882a593Smuzhiyun " negw %3\n"
56*4882a593Smuzhiyun " jmp %%pc@(1f,%3:w:2)\n"
57*4882a593Smuzhiyun "4: movel %0@+,%1@+\n"
58*4882a593Smuzhiyun " movel %0@+,%1@+\n"
59*4882a593Smuzhiyun " movel %0@+,%1@+\n"
60*4882a593Smuzhiyun " movel %0@+,%1@+\n"
61*4882a593Smuzhiyun " movel %0@+,%1@+\n"
62*4882a593Smuzhiyun " movel %0@+,%1@+\n"
63*4882a593Smuzhiyun " movel %0@+,%1@+\n"
64*4882a593Smuzhiyun " movel %0@+,%1@+\n"
65*4882a593Smuzhiyun "1: dbra %2,4b\n"
66*4882a593Smuzhiyun " clrw %2\n"
67*4882a593Smuzhiyun " subql #1,%2\n"
68*4882a593Smuzhiyun " jpl 4b"
69*4882a593Smuzhiyun : "=a" (lfrom), "=a" (lto), "=d" (temp), "=&d" (temp1)
70*4882a593Smuzhiyun : "0" (lfrom), "1" (lto), "2" (temp));
71*4882a593Smuzhiyun #endif
72*4882a593Smuzhiyun to = lto;
73*4882a593Smuzhiyun from = lfrom;
74*4882a593Smuzhiyun }
75*4882a593Smuzhiyun if (n & 2) {
76*4882a593Smuzhiyun short *sto = to;
77*4882a593Smuzhiyun const short *sfrom = from;
78*4882a593Smuzhiyun *sto++ = *sfrom++;
79*4882a593Smuzhiyun to = sto;
80*4882a593Smuzhiyun from = sfrom;
81*4882a593Smuzhiyun }
82*4882a593Smuzhiyun if (n & 1) {
83*4882a593Smuzhiyun char *cto = to;
84*4882a593Smuzhiyun const char *cfrom = from;
85*4882a593Smuzhiyun *cto = *cfrom;
86*4882a593Smuzhiyun }
87*4882a593Smuzhiyun return xto;
88*4882a593Smuzhiyun }
89*4882a593Smuzhiyun EXPORT_SYMBOL(memcpy);
90