include/asm-parisc/byteorder.h

   1 #ifndef _PARISC_BYTEORDER_H
   2 #define _PARISC_BYTEORDER_H
   3
   4 #include <asm/types.h>
   5 #include <linux/compiler.h>
   6
   7 #ifdef __GNUC__
   8
   9 static __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
  18 static __inline__ __attribute_const__ __u32 ___arch__swab24(__u32 x)
  19 {
  20         __asm__("shd %0, %0, 8, %0\n\t"         /* shift xabcxabc -> cxab */
  21                 "dep %0, 15, 8, %0\n\t"         /* deposit cxab -> cbab */
  22                 "shd %%r0, %0, 8, %0"           /* shift 0000cbab -> 0cba */
  23                 : "=r" (x)
  24                 : "0" (x));
  25         return x;
  26 }
  27
  28 static __inline__ __attribute_const__ __u32 ___arch__swab32(__u32 x)
  29 {
  30         unsigned int temp;
  31         __asm__("shd %0, %0, 16, %1\n\t"        /* shift abcdabcd -> cdab */
  32                 "dep %1, 15, 8, %1\n\t"         /* deposit cdab -> cbab */
  33                 "shd %0, %1, 8, %0"             /* shift abcdcbab -> dcba */
  34                 : "=r" (x), "=&r" (temp)
  35                 : "0" (x));
  36         return x;
  37 }
  38
  39
  40 #if BITS_PER_LONG > 32
  41 /*
  42 ** From "PA-RISC 2.0 Architecture", HP Professional Books.
  43 ** See Appendix I page 8 , "Endian Byte Swapping".
  44 **
  45 ** Pretty cool algorithm: (* == zero'd bits)
  46 **      PERMH   01234567 -> 67452301 into %0
  47 **      HSHL    67452301 -> 7*5*3*1* into %1
  48 **      HSHR    67452301 -> *6*4*2*0 into %0
  49 **      OR      %0 | %1  -> 76543210 into %0 (all done!)
  50 */
  51 static __inline__ __attribute_const__ __u64 ___arch__swab64(__u64 x) {
  52         __u64 temp;
  53         __asm__("permh,3210 %0, %0\n\t"
  54                 "hshl %0, 8, %1\n\t"
  55                 "hshr,u %0, 8, %0\n\t"
  56                 "or %1, %0, %0"
  57                 : "=r" (x), "=&r" (temp)
  58                 : "0" (x));
  59         return x;
  60 }
  61 #define __arch__swab64(x) ___arch__swab64(x)
  62 #define __BYTEORDER_HAS_U64__
  63 #elif !defined(__STRICT_ANSI__)
  64 static __inline__ __attribute_const__ __u64 ___arch__swab64(__u64 x)
  65 {
  66         __u32 t1 = ___arch__swab32((__u32) x);
  67         __u32 t2 = ___arch__swab32((__u32) (x >> 32));
  68         return (((__u64) t1 << 32) | t2);
  69 }
  70 #define __arch__swab64(x) ___arch__swab64(x)
  71 #define __BYTEORDER_HAS_U64__
  72 #endif
  73
  74 #define __arch__swab16(x) ___arch__swab16(x)
  75 #define __arch__swab24(x) ___arch__swab24(x)
  76 #define __arch__swab32(x) ___arch__swab32(x)
  77
  78 #endif /* __GNUC__ */
  79
  80 #include <linux/byteorder/big_endian.h>
  81
  82 #endif /* _PARISC_BYTEORDER_H */