xtensa: introduce swab.h

Fixes compile breakage as linux/byteorder.h was removed.

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 69 deletions

diff --git a/arch/xtensa/include/asm/byteorder.h b/arch/xtensa/include/asm/byteorder.h
index 07d10ad364d..329b94591ca 100644
--- a/arch/xtensa/include/asm/byteorder.h
+++ b/arch/xtensa/include/asm/byteorder.h
@@ -1,80 +1,14 @@
-/*
- * include/asm-xtensa/byteorder.h
- *
- * 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.
- *
- * Copyright (C) 2001 - 2005 Tensilica Inc.
- */
-
 #ifndef _XTENSA_BYTEORDER_H
 #define _XTENSA_BYTEORDER_H
 
-#include <asm/types.h>
-#include <linux/compiler.h>
+#include <asm/swab.h>
 
 #ifdef __XTENSA_EL__
-# define __LITTLE_ENDIAN
+#include <linux/byteorder/little_endian.h>
 #elif defined(__XTENSA_EB__)
-# define __BIG_ENDIAN
+#include <linux/byteorder/big_endian.h>
 #else
 # error processor byte order undefined!
 #endif
 
-#define __SWAB_64_THRU_32__
-
-static inline __attribute_const__ __u32 __arch_swab32(__u32 x)
-{
-    __u32 res;
-    /* instruction sequence from Xtensa ISA release 2/2000 */
-    __asm__("ssai     8           \n\t"
-	    "srli     %0, %1, 16  \n\t"
-	    "src      %0, %0, %1  \n\t"
-	    "src      %0, %0, %0  \n\t"
-	    "src      %0, %1, %0  \n"
-	    : "=&a" (res)
-	    : "a" (x)
-	    );
-    return res;
-}
-#define __arch_swab32 __arch_swab32
-
-static inline __attribute_const__ __u16 __arch_swab16(__u16 x)
-{
-    /* Given that 'short' values are signed (i.e., can be negative),
-     * we cannot assume that the upper 16-bits of the register are
-     * zero.  We are careful to mask values after shifting.
-     */
-
-    /* There exists an anomaly between xt-gcc and xt-xcc.  xt-gcc
-     * inserts an extui instruction after putting this function inline
-     * to ensure that it uses only the least-significant 16 bits of
-     * the result.  xt-xcc doesn't use an extui, but assumes the
-     * __asm__ macro follows convention that the upper 16 bits of an
-     * 'unsigned short' result are still zero.  This macro doesn't
-     * follow convention; indeed, it leaves garbage in the upport 16
-     * bits of the register.
-
-     * Declaring the temporary variables 'res' and 'tmp' to be 32-bit
-     * types while the return type of the function is a 16-bit type
-     * forces both compilers to insert exactly one extui instruction
-     * (or equivalent) to mask off the upper 16 bits. */
-
-    __u32 res;
-    __u32 tmp;
-
-    __asm__("extui    %1, %2, 8, 8\n\t"
-	    "slli     %0, %2, 8   \n\t"
-	    "or       %0, %0, %1  \n"
-	    : "=&a" (res), "=&a" (tmp)
-	    : "a" (x)
-	    );
-
-    return res;
-}
-#define __arch_swab16 __arch_swab16
-
-#include <linux/byteorder.h>
-
 #endif /* _XTENSA_BYTEORDER_H */