1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux 1
2 /*
3 * arch/arm/include/asm/byteorder.h
4 *
5 * ARM Endian-ness. In little endian mode, th
6 * that byte accesses appear as:
7 * 0 = d0...d7, 1 = d8...d15, 2 = d16...d23,
8 * and word accesses (data or instruction) app
9 * d0...d31
10 *
11 * When in big endian mode, byte accesses appe
12 * 0 = d24...d31, 1 = d16...d23, 2 = d8...d15
13 * and word accesses (data or instruction) app
14 * d0...d31
15 */
16 #ifndef _UAPI__ASM_ARM_SWAB_H
17 #define _UAPI__ASM_ARM_SWAB_H
18
19 #include <linux/compiler.h>
20 #include <linux/types.h>
21
22 #if !defined(__STRICT_ANSI__) || defined(__KER
23 # define __SWAB_64_THRU_32__
24 #endif
25
26
27 #if !defined(__KERNEL__) || __LINUX_ARM_ARCH__
28 static inline __attribute_const__ __u32 __arch
29 {
30 __u32 t;
31
32 #ifndef __thumb__
33 if (!__builtin_constant_p(x)) {
34 /*
35 * The compiler needs a bit of
36 * right thing and not screw i
37 * depending on the gcc versio
38 */
39 asm ("eor\t%0, %1, %1, ror #16
40 } else
41 #endif
42 t = x ^ ((x << 16) | (x >> 16)
43
44 x = (x << 24) | (x >> 8);
45 t &= ~0x00FF0000;
46 x ^= (t >> 8);
47
48 return x;
49 }
50 #define __arch_swab32 __arch_swab32
51
52 #endif
53
54 #endif /* _UAPI__ASM_ARM_SWAB_H */
55
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