diff options
author | Greg Ungerer <gerg@uclinux.org> | 2011-03-28 06:53:37 (GMT) |
---|---|---|
committer | Greg Ungerer <gerg@uclinux.org> | 2011-05-24 00:03:49 (GMT) |
commit | 66d83ab32aec5d84d707d4d72717b9468ec33a96 (patch) | |
tree | 09a7748e0980fd99b6925a92ad5af53c87638a53 /arch/m68k/lib/memcpy.c | |
parent | d10ed2f5383cc6e6b7649f03540b8cb1838d5f67 (diff) | |
download | linux-fsl-qoriq-66d83ab32aec5d84d707d4d72717b9468ec33a96.tar.xz |
m68k: remove duplicate memcpy() implementation
Merging the mmu and non-mmu directories we ended up with duplicate
implementations of memcpy(). One is a little more optimized for the
>= 68020 case, but that can easily be inserted into a single
implementation of memcpy(). Clean up the exporting of this symbol
too, otherwise we end up exporting it twice on a no-mmu build.
Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Diffstat (limited to 'arch/m68k/lib/memcpy.c')
-rw-r--r-- | arch/m68k/lib/memcpy.c | 128 |
1 files changed, 73 insertions, 55 deletions
diff --git a/arch/m68k/lib/memcpy.c b/arch/m68k/lib/memcpy.c index b50dbca..62182c8 100644 --- a/arch/m68k/lib/memcpy.c +++ b/arch/m68k/lib/memcpy.c @@ -1,62 +1,80 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file COPYING in the main directory of this archive + * for more details. + */ -#include <linux/types.h> +#include <linux/module.h> +#include <linux/string.h> -void * memcpy(void * to, const void * from, size_t n) +void *memcpy(void *to, const void *from, size_t n) { -#ifdef CONFIG_COLDFIRE - void *xto = to; - size_t temp; + void *xto = to; + size_t temp, temp1; - if (!n) - return xto; - if ((long) to & 1) - { - char *cto = to; - const char *cfrom = from; - *cto++ = *cfrom++; - to = cto; - from = cfrom; - n--; - } - if (n > 2 && (long) to & 2) - { - short *sto = to; - const short *sfrom = from; - *sto++ = *sfrom++; - to = sto; - from = sfrom; - n -= 2; - } - temp = n >> 2; - if (temp) - { - long *lto = to; - const long *lfrom = from; - for (; temp; temp--) - *lto++ = *lfrom++; - to = lto; - from = lfrom; - } - if (n & 2) - { - short *sto = to; - const short *sfrom = from; - *sto++ = *sfrom++; - to = sto; - from = sfrom; - } - if (n & 1) - { - char *cto = to; - const char *cfrom = from; - *cto = *cfrom; - } - return xto; + if (!n) + return xto; + if ((long)to & 1) { + char *cto = to; + const char *cfrom = from; + *cto++ = *cfrom++; + to = cto; + from = cfrom; + n--; + } + if (n > 2 && (long)to & 2) { + short *sto = to; + const short *sfrom = from; + *sto++ = *sfrom++; + to = sto; + from = sfrom; + n -= 2; + } + temp = n >> 2; + if (temp) { + long *lto = to; + const long *lfrom = from; +#if defined(__mc68020__) || defined(__mc68030__) || \ + defined(__mc68040__) || defined(__mc68060__) || defined(__mcpu32__) + asm volatile ( + " movel %2,%3\n" + " andw #7,%3\n" + " lsrl #3,%2\n" + " negw %3\n" + " jmp %%pc@(1f,%3:w:2)\n" + "4: movel %0@+,%1@+\n" + " movel %0@+,%1@+\n" + " movel %0@+,%1@+\n" + " movel %0@+,%1@+\n" + " movel %0@+,%1@+\n" + " movel %0@+,%1@+\n" + " movel %0@+,%1@+\n" + " movel %0@+,%1@+\n" + "1: dbra %2,4b\n" + " clrw %2\n" + " subql #1,%2\n" + " jpl 4b" + : "=a" (lfrom), "=a" (lto), "=d" (temp), "=&d" (temp1) + : "0" (lfrom), "1" (lto), "2" (temp)); #else - const char *c_from = from; - char *c_to = to; - while (n-- > 0) - *c_to++ = *c_from++; - return((void *) to); + for (; temp; temp--) + *lto++ = *lfrom++; #endif + to = lto; + from = lfrom; + } + if (n & 2) { + short *sto = to; + const short *sfrom = from; + *sto++ = *sfrom++; + to = sto; + from = sfrom; + } + if (n & 1) { + char *cto = to; + const char *cfrom = from; + *cto = *cfrom; + } + return xto; } +EXPORT_SYMBOL(memcpy); |