Logo Search packages:      
Sourcecode: linux version File versions

byteorder.h

#ifndef _ALPHA_BYTEORDER_H
#define _ALPHA_BYTEORDER_H

#include <asm/types.h>
#include <linux/compiler.h>
#include <asm/compiler.h>

#ifdef __GNUC__

static inline __attribute_const__ __u32 __arch__swab32(__u32 x)
{
      /*
       * Unfortunately, we can't use the 6 instruction sequence
       * on ev6 since the latency of the UNPKBW is 3, which is
       * pretty hard to hide.  Just in case a future implementation
       * has a lower latency, here's the sequence (also by Mike Burrows)
       *
       * UNPKBW a0, v0       v0: 00AA00BB00CC00DD
       * SLL v0, 24, a0      a0: BB00CC00DD000000
       * BIS v0, a0, a0      a0: BBAACCBBDDCC00DD
       * EXTWL a0, 6, v0     v0: 000000000000BBAA
       * ZAP a0, 0xf3, a0    a0: 00000000DDCC0000
       * ADDL a0, v0, v0     v0: ssssssssDDCCBBAA
       */

      __u64 t0, t1, t2, t3;

      t0 = __kernel_inslh(x, 7);    /* t0 : 0000000000AABBCC */
      t1 = __kernel_inswl(x, 3);    /* t1 : 000000CCDD000000 */
      t1 |= t0;               /* t1 : 000000CCDDAABBCC */
      t2 = t1 >> 16;                /* t2 : 0000000000CCDDAA */
      t0 = t1 & 0xFF00FF00;         /* t0 : 00000000DD00BB00 */
      t3 = t2 & 0x00FF00FF;         /* t3 : 0000000000CC00AA */
      t1 = t0 + t3;                 /* t1 : ssssssssDDCCBBAA */

      return t1;
}

#define __arch__swab32 __arch__swab32

#endif /* __GNUC__ */

#define __BYTEORDER_HAS_U64__

#include <linux/byteorder/little_endian.h>

#endif /* _ALPHA_BYTEORDER_H */

Generated by  Doxygen 1.6.0   Back to index