| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _I386_BYTEORDER_H |
| 2 | #define _I386_BYTEORDER_H |
| 3 | |
| 4 | #include <asm/types.h> |
| 5 | #include <linux/compiler.h> |
| 6 | |
| 7 | #ifdef __GNUC__ |
| 8 | |
| 9 | /* For avoiding bswap on i386 */ |
| 10 | #ifdef __KERNEL__ |
| 11 | #include <linux/config.h> |
| 12 | #endif |
| 13 | |
| 14 | static __inline__ __attribute_const__ __u32 ___arch__swab32(__u32 x) |
| 15 | { |
| 16 | #ifdef CONFIG_X86_BSWAP |
| 17 | __asm__("bswap %0" : "=r" (x) : "0" (x)); |
| 18 | #else |
| 19 | __asm__("xchgb %b0,%h0\n\t" /* swap lower bytes */ |
| 20 | "rorl $16,%0\n\t" /* swap words */ |
| 21 | "xchgb %b0,%h0" /* swap higher bytes */ |
| 22 | :"=q" (x) |
| 23 | : "0" (x)); |
| 24 | #endif |
| 25 | return x; |
| 26 | } |
| 27 | |
| 28 | static __inline__ __attribute_const__ __u64 ___arch__swab64(__u64 val) |
| 29 | { |
| 30 | union { |
| 31 | struct { __u32 a,b; } s; |
| 32 | __u64 u; |
| 33 | } v; |
| 34 | v.u = val; |
| 35 | #ifdef CONFIG_X86_BSWAP |
| 36 | asm("bswapl %0 ; bswapl %1 ; xchgl %0,%1" |
| 37 | : "=r" (v.s.a), "=r" (v.s.b) |
| 38 | : "0" (v.s.a), "1" (v.s.b)); |
| 39 | #else |
| 40 | v.s.a = ___arch__swab32(v.s.a); |
| 41 | v.s.b = ___arch__swab32(v.s.b); |
| 42 | asm("xchgl %0,%1" : "=r" (v.s.a), "=r" (v.s.b) : "0" (v.s.a), "1" (v.s.b)); |
| 43 | #endif |
| 44 | return v.u; |
| 45 | } |
| 46 | |
| 47 | /* Do not define swab16. Gcc is smart enough to recognize "C" version and |
| 48 | convert it into rotation or exhange. */ |
| 49 | |
| 50 | #define __arch__swab64(x) ___arch__swab64(x) |
| 51 | #define __arch__swab32(x) ___arch__swab32(x) |
| 52 | |
| 53 | #define __BYTEORDER_HAS_U64__ |
| 54 | |
| 55 | #endif /* __GNUC__ */ |
| 56 | |
| 57 | #include <linux/byteorder/little_endian.h> |
| 58 | |
| 59 | #endif /* _I386_BYTEORDER_H */ |