2 * linux/include/asm-arm/byteorder.h
4 * ARM Endian-ness. In little endian mode, the data bus is connected such
5 * that byte accesses appear as:
6 * 0 = d0...d7, 1 = d8...d15, 2 = d16...d23, 3 = d24...d31
7 * and word accesses (data or instruction) appear as:
10 * When in big endian mode, byte accesses appear as:
11 * 0 = d24...d31, 1 = d16...d23, 2 = d8...d15, 3 = d0...d7
12 * and word accesses (data or instruction) appear as:
15 #ifndef __ASM_ARM_BYTEORDER_H
16 #define __ASM_ARM_BYTEORDER_H
18 #include <linux/compiler.h>
19 #include <asm/types.h>
21 static inline __attribute_const__ __u32 ___arch__swab32(__u32 x)
25 t = x ^ ((x << 16) | (x >> 16)); /* eor r1,r0,r0,ror #16 */
26 x = (x << 24) | (x >> 8); /* mov r0,r0,ror #8 */
27 t &= ~0x00FF0000; /* bic r1,r1,#0x00FF0000 */
28 x ^= (t >> 8); /* eor r0,r0,r1,lsr #8 */
33 #define __arch__swab32(x) ___arch__swab32(x)
35 #if !defined(__STRICT_ANSI__) || defined(__KERNEL__)
36 # define __BYTEORDER_HAS_U64__
37 # define __SWAB_64_THRU_32__
41 #include <linux/byteorder/big_endian.h>
43 #include <linux/byteorder/little_endian.h>