sgi-xp: create a common xp_remote_memcpy() function

Create a common remote memcpy function that maps to what the hardware
booted supports.

Signed-off-by: Dean Nelson <dcn@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/misc/sgi-xp/xp_main.c

@@ -36,6 +36,9 @@ struct device *xp = &xp_dbg_subname;
 short xp_max_npartitions;
 EXPORT_SYMBOL_GPL(xp_max_npartitions);
 
+enum xp_retval (*xp_remote_memcpy) (void *dst, const void *src, size_t len);
+EXPORT_SYMBOL_GPL(xp_remote_memcpy);
+
 /*
  * xpc_registrations[] keeps track of xpc_connect()'s done by the kernel-level
  * users of XPC.