arch/all-pc/boot/grub/netboot/osdep.h

   1 #ifndef __OSDEP_H__
   2 #define __OSDEP_H__
   3
   4 /*
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation; either version 2, or (at
   8  * your option) any later version.
   9  */
  10
  11 #define __LITTLE_ENDIAN         /* x86 */
  12
  13 /* Taken from /usr/include/linux/hfs_sysdep.h */
  14 #if defined(__BIG_ENDIAN)
  15 #       if !defined(__constant_htonl)
  16 #               define __constant_htonl(x) (x)
  17 #       endif
  18 #       if !defined(__constant_htons)
  19 #               define __constant_htons(x) (x)
  20 #       endif
  21 #elif defined(__LITTLE_ENDIAN)
  22 #       if !defined(__constant_htonl)
  23 #               define __constant_htonl(x) \
  24         ((unsigned long int)((((unsigned long int)(x) & 0x000000ffU) << 24) | \
  25                              (((unsigned long int)(x) & 0x0000ff00U) <<  8) | \
  26                              (((unsigned long int)(x) & 0x00ff0000U) >>  8) | \
  27                              (((unsigned long int)(x) & 0xff000000U) >> 24)))
  28 #       endif
  29 #       if !defined(__constant_htons)
  30 #               define __constant_htons(x) \
  31         ((unsigned short int)((((unsigned short int)(x) & 0x00ff) << 8) | \
  32                               (((unsigned short int)(x) & 0xff00) >> 8)))
  33 #       endif
  34 #else
  35 #       error "Don't know if bytes are big- or little-endian!"
  36 #endif
  37
  38 #define ntohl(x) \
  39 (__builtin_constant_p(x) ? \
  40  __constant_htonl((x)) : \
  41  __swap32(x))
  42 #define htonl(x) \
  43 (__builtin_constant_p(x) ? \
  44  __constant_htonl((x)) : \
  45  __swap32(x))
  46 #define ntohs(x) \
  47 (__builtin_constant_p(x) ? \
  48  __constant_htons((x)) : \
  49  __swap16(x))
  50 #define htons(x) \
  51 (__builtin_constant_p(x) ? \
  52  __constant_htons((x)) : \
  53  __swap16(x))
  54
  55 static inline unsigned long int __swap32(unsigned long int x)
  56 {
  57         __asm__("xchgb %b0,%h0\n\t"
  58                 "rorl $16,%0\n\t"
  59                 "xchgb %b0,%h0"
  60                 : "=q" (x)
  61                 : "0" (x));
  62         return x;
  63 }
  64
  65 static inline unsigned short int __swap16(unsigned short int x)
  66 {
  67         __asm__("xchgb %b0,%h0"
  68                 : "=q" (x)
  69                 : "0" (x));
  70         return x;
  71 }
  72
  73 /* Make routines available to all */
  74 #define swap32(x)       __swap32(x)
  75 #define swap16(x)       __swap16(x)
  76
  77 #include "linux-asm-io.h"
  78
  79 typedef unsigned long Address;
  80
  81 /* ANSI prototyping macro */
  82 #ifdef  __STDC__
  83 #define P(x)    x
  84 #else
  85 #define P(x)    ()
  86 #endif
  87
  88 #endif
  89
  90 /*
  91  * Local variables:
  92  *  c-basic-offset: 8
  93  * End:
  94  */