1#ifndef _PARISC_SWAB_H 2#define _PARISC_SWAB_H 3 4#include <linux/types.h> 5#include <linux/compiler.h> 6 7#define __SWAB_64_THRU_32__ 8 9static inline __attribute_const__ __u16 __arch_swab16(__u16 x) 10{ 11 __asm__("dep %0, 15, 8, %0\n\t" /* deposit 00ab -> 0bab */ 12 "shd %%r0, %0, 8, %0" /* shift 000000ab -> 00ba */ 13 : "=r" (x) 14 : "0" (x)); 15 return x; 16} 17#define __arch_swab16 __arch_swab16 18 19static inline __attribute_const__ __u32 __arch_swab24(__u32 x) 20{ 21 __asm__("shd %0, %0, 8, %0\n\t" /* shift xabcxabc -> cxab */ 22 "dep %0, 15, 8, %0\n\t" /* deposit cxab -> cbab */ 23 "shd %%r0, %0, 8, %0" /* shift 0000cbab -> 0cba */ 24 : "=r" (x) 25 : "0" (x)); 26 return x; 27} 28 29static inline __attribute_const__ __u32 __arch_swab32(__u32 x) 30{ 31 unsigned int temp; 32 __asm__("shd %0, %0, 16, %1\n\t" /* shift abcdabcd -> cdab */ 33 "dep %1, 15, 8, %1\n\t" /* deposit cdab -> cbab */ 34 "shd %0, %1, 8, %0" /* shift abcdcbab -> dcba */ 35 : "=r" (x), "=&r" (temp) 36 : "0" (x)); 37 return x; 38} 39#define __arch_swab32 __arch_swab32 40 41#if BITS_PER_LONG > 32 42/* 43** From "PA-RISC 2.0 Architecture", HP Professional Books. 44** See Appendix I page 8 , "Endian Byte Swapping". 45** 46** Pretty cool algorithm: (* == zero'd bits) 47** PERMH 01234567 -> 67452301 into %0 48** HSHL 67452301 -> 7*5*3*1* into %1 49** HSHR 67452301 -> *6*4*2*0 into %0 50** OR %0 | %1 -> 76543210 into %0 (all done!) 51*/ 52static inline __attribute_const__ __u64 __arch_swab64(__u64 x) 53{ 54 __u64 temp; 55 __asm__("permh,3210 %0, %0\n\t" 56 "hshl %0, 8, %1\n\t" 57 "hshr,u %0, 8, %0\n\t" 58 "or %1, %0, %0" 59 : "=r" (x), "=&r" (temp) 60 : "0" (x)); 61 return x; 62} 63#define __arch_swab64 __arch_swab64 64#endif /* BITS_PER_LONG > 32 */ 65 66#endif /* _PARISC_SWAB_H */ 67