| Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| Harvey Harrison | af8e24e | 2009-01-06 14:56:30 -0800 | [diff] [blame] | 2 | /* |
| 3 | * arch/arm/include/asm/byteorder.h |
| 4 | * |
| 5 | * ARM Endian-ness. In little endian mode, the data bus is connected such |
| 6 | * that byte accesses appear as: |
| 7 | * 0 = d0...d7, 1 = d8...d15, 2 = d16...d23, 3 = d24...d31 |
| 8 | * and word accesses (data or instruction) appear as: |
| 9 | * d0...d31 |
| 10 | * |
| 11 | * When in big endian mode, byte accesses appear as: |
| 12 | * 0 = d24...d31, 1 = d16...d23, 2 = d8...d15, 3 = d0...d7 |
| 13 | * and word accesses (data or instruction) appear as: |
| 14 | * d0...d31 |
| 15 | */ |
| 16 | #ifndef __ASM_ARM_SWAB_H |
| 17 | #define __ASM_ARM_SWAB_H |
| 18 | |
| David Howells | cb8db5d | 2012-10-12 13:05:52 +0100 | [diff] [blame] | 19 | #include <uapi/asm/swab.h> |
| Harvey Harrison | af8e24e | 2009-01-06 14:56:30 -0800 | [diff] [blame] | 20 | |
| David Howells | 1632b9e | 2011-12-13 15:07:49 +0000 | [diff] [blame] | 21 | #if __LINUX_ARM_ARCH__ >= 6 |
| Rabin Vincent | 40f5b07 | 2009-10-25 16:55:33 +0100 | [diff] [blame] | 22 | |
| Dave Martin | df0e74d | 2011-11-24 12:23:18 +0100 | [diff] [blame] | 23 | static inline __attribute_const__ __u32 __arch_swahb32(__u32 x) |
| Rabin Vincent | 40f5b07 | 2009-10-25 16:55:33 +0100 | [diff] [blame] | 24 | { |
| 25 | __asm__ ("rev16 %0, %1" : "=r" (x) : "r" (x)); |
| 26 | return x; |
| 27 | } |
| Dave Martin | df0e74d | 2011-11-24 12:23:18 +0100 | [diff] [blame] | 28 | #define __arch_swahb32 __arch_swahb32 |
| 29 | #define __arch_swab16(x) ((__u16)__arch_swahb32(x)) |
| Rabin Vincent | 40f5b07 | 2009-10-25 16:55:33 +0100 | [diff] [blame] | 30 | |
| 31 | static inline __attribute_const__ __u32 __arch_swab32(__u32 x) |
| 32 | { |
| 33 | __asm__ ("rev %0, %1" : "=r" (x) : "r" (x)); |
| 34 | return x; |
| 35 | } |
| 36 | #define __arch_swab32 __arch_swab32 |
| 37 | |
| David Howells | 1632b9e | 2011-12-13 15:07:49 +0000 | [diff] [blame] | 38 | #endif |
| 39 | #endif |