| Harvey Harrison | 5d30a68 | 2009-01-06 14:56:28 -0800 | [diff] [blame] | 1 | #ifndef _ASM_X86_SWAB_H |
| 2 | #define _ASM_X86_SWAB_H |
| 3 | |
| Jaswinder Singh Rajput | 7cff360 | 2009-01-30 22:57:38 +0530 | [diff] [blame] | 4 | #include <linux/types.h> |
| Harvey Harrison | 5d30a68 | 2009-01-06 14:56:28 -0800 | [diff] [blame] | 5 | #include <linux/compiler.h> |
| 6 | |
| 7 | static inline __attribute_const__ __u32 __arch_swab32(__u32 val) |
| 8 | { |
| 9 | #ifdef __i386__ |
| 10 | # ifdef CONFIG_X86_BSWAP |
| 11 | asm("bswap %0" : "=r" (val) : "0" (val)); |
| 12 | # else |
| 13 | asm("xchgb %b0,%h0\n\t" /* swap lower bytes */ |
| 14 | "rorl $16,%0\n\t" /* swap words */ |
| 15 | "xchgb %b0,%h0" /* swap higher bytes */ |
| 16 | : "=q" (val) |
| 17 | : "0" (val)); |
| 18 | # endif |
| 19 | |
| 20 | #else /* __i386__ */ |
| 21 | asm("bswapl %0" |
| 22 | : "=r" (val) |
| 23 | : "0" (val)); |
| 24 | #endif |
| 25 | return val; |
| 26 | } |
| 27 | #define __arch_swab32 __arch_swab32 |
| 28 | |
| 29 | static inline __attribute_const__ __u64 __arch_swab64(__u64 val) |
| 30 | { |
| 31 | #ifdef __i386__ |
| 32 | union { |
| 33 | struct { |
| 34 | __u32 a; |
| 35 | __u32 b; |
| 36 | } s; |
| 37 | __u64 u; |
| 38 | } v; |
| 39 | v.u = val; |
| 40 | # ifdef CONFIG_X86_BSWAP |
| 41 | asm("bswapl %0 ; bswapl %1 ; xchgl %0,%1" |
| 42 | : "=r" (v.s.a), "=r" (v.s.b) |
| 43 | : "0" (v.s.a), "1" (v.s.b)); |
| 44 | # else |
| 45 | v.s.a = __arch_swab32(v.s.a); |
| 46 | v.s.b = __arch_swab32(v.s.b); |
| 47 | asm("xchgl %0,%1" |
| 48 | : "=r" (v.s.a), "=r" (v.s.b) |
| 49 | : "0" (v.s.a), "1" (v.s.b)); |
| 50 | # endif |
| 51 | return v.u; |
| 52 | #else /* __i386__ */ |
| 53 | asm("bswapq %0" |
| 54 | : "=r" (val) |
| 55 | : "0" (val)); |
| 56 | return val; |
| 57 | #endif |
| 58 | } |
| 59 | #define __arch_swab64 __arch_swab64 |
| 60 | |
| 61 | #endif /* _ASM_X86_SWAB_H */ |