| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * arch/arm/include/asm/byteorder.h |
| * |
| * ARM Endian-ness. In little endian mode, the data bus is connected such |
| * that byte accesses appear as: |
| * 0 = d0...d7, 1 = d8...d15, 2 = d16...d23, 3 = d24...d31 |
| * and word accesses (data or instruction) appear as: |
| * d0...d31 |
| * |
| * When in big endian mode, byte accesses appear as: |
| * 0 = d24...d31, 1 = d16...d23, 2 = d8...d15, 3 = d0...d7 |
| * and word accesses (data or instruction) appear as: |
| * d0...d31 |
| */ |
| #ifndef __ASM_ARM_SWAB_H |
| #define __ASM_ARM_SWAB_H |
| |
| #include <uapi/asm/swab.h> |
| |
| #if __LINUX_ARM_ARCH__ >= 6 |
| |
| static inline __attribute_const__ __u32 __arch_swahb32(__u32 x) |
| { |
| __asm__ ("rev16 %0, %1" : "=r" (x) : "r" (x)); |
| return x; |
| } |
| #define __arch_swahb32 __arch_swahb32 |
| #define __arch_swab16(x) ((__u16)__arch_swahb32(x)) |
| |
| static inline __attribute_const__ __u32 __arch_swab32(__u32 x) |
| { |
| __asm__ ("rev %0, %1" : "=r" (x) : "r" (x)); |
| return x; |
| } |
| #define __arch_swab32 __arch_swab32 |
| |
| #endif |
| #endif |
