arch/tile: support building big-endian kernel

The toolchain supports big-endian mode now, so add support for building
the kernel to run big-endian as well.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>

arch/tile/lib/memchr_64.c

@@ -15,6 +15,7 @@
 #include <linux/types.h>
 #include <linux/string.h>
 #include <linux/module.h>
+#include "string-endian.h"
 
 void *memchr(const void *s, int c, size_t n)
 {
@@ -39,11 +40,8 @@ void *memchr(const void *s, int c, size_t n)
 
 	/* Read the first word, but munge it so that bytes before the array
 	 * will not match goal.
-	 *
-	 * Note that this shift count expression works because we know
-	 * shift counts are taken mod 64.
 	 */
-	before_mask = (1ULL << (s_int << 3)) - 1;
+	before_mask = MASK(s_int);
 	v = (*p | before_mask) ^ (goal & before_mask);
 
 	/* Compute the address of the last byte. */
@@ -65,7 +63,7 @@ void *memchr(const void *s, int c, size_t n)
 	/* We found a match, but it might be in a byte past the end
 	 * of the array.
 	 */
-	ret = ((char *)p) + (__insn_ctz(bits) >> 3);
+	ret = ((char *)p) + (CFZ(bits) >> 3);
 	return (ret <= last_byte_ptr) ? ret : NULL;
 }
 EXPORT_SYMBOL(memchr);