Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/include/asm-arm/byteorder.h |
| 3 | * |
| 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: |
| 8 | * d0...d31 |
| 9 | * |
| 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: |
| 13 | * d0...d31 |
| 14 | */ |
| 15 | #ifndef __ASM_ARM_BYTEORDER_H |
| 16 | #define __ASM_ARM_BYTEORDER_H |
| 17 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <asm/types.h> |
| 19 | |
Andre McCurdy | 6351610 | 2006-01-07 11:39:20 +0000 | [diff] [blame^] | 20 | static inline __attribute_const__ __u32 ___arch__swab32(__u32 x) |
| 21 | { |
| 22 | __u32 t; |
| 23 | |
| 24 | t = x ^ ((x << 16) | (x >> 16)); /* eor r1,r0,r0,ror #16 */ |
| 25 | x = (x << 24) | (x >> 8); /* mov r0,r0,ror #8 */ |
| 26 | t &= ~0x00FF0000; /* bic r1,r1,#0x00FF0000 */ |
| 27 | x ^= (t >> 8); /* eor r0,r0,r1,lsr #8 */ |
| 28 | |
| 29 | return x; |
| 30 | } |
| 31 | |
| 32 | #define __arch__swab32(x) ___arch__swab32(x) |
| 33 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #if !defined(__STRICT_ANSI__) || defined(__KERNEL__) |
| 35 | # define __BYTEORDER_HAS_U64__ |
| 36 | # define __SWAB_64_THRU_32__ |
| 37 | #endif |
| 38 | |
| 39 | #ifdef __ARMEB__ |
| 40 | #include <linux/byteorder/big_endian.h> |
| 41 | #else |
| 42 | #include <linux/byteorder/little_endian.h> |
| 43 | #endif |
| 44 | |
| 45 | #endif |
| 46 | |