Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / m68k / lib / memcpy.c

diff --git a/kernel/arch/m68k/lib/memcpy.c b/kernel/arch/m68k/lib/memcpy.c
new file mode 100644 (file)
index 0000000..c1e2dfb
--- /dev/null
+++ b/kernel/arch/m68k/lib/memcpy.c
@@ -0,0 +1,89 @@
+/*
+ * 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/module.h>
+#include <linux/string.h>
+
+void *memcpy(void *to, const void *from, size_t n)
+{
+       void *xto = to;
+       size_t temp;
+
+       if (!n)
+               return xto;
+       if ((long)to & 1) {
+               char *cto = to;
+               const char *cfrom = from;
+               *cto++ = *cfrom++;
+               to = cto;
+               from = cfrom;
+               n--;
+       }
+#if defined(CONFIG_M68000)
+       if ((long)from & 1) {
+               char *cto = to;
+               const char *cfrom = from;
+               for (; n; n--)
+                       *cto++ = *cfrom++;
+               return xto;
+       }
+#endif
+       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(CONFIG_M68000) || defined(CONFIG_COLDFIRE)
+               for (; temp; temp--)
+                       *lto++ = *lfrom++;
+#else
+               size_t temp1;
+               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));
+#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);