lib/i86/misc/hton86.s

   1 !       htonX(), ntohX() - Host to network byte order conversion
   2 !                                                       Author: Kees J. Bot
   3 !                                                               7 Jan 1997
   4 !
   5 ! This is a little endian 8086, so we swap bytes to/from the big endian network
   6 ! order.  The normal <net/hton.h> macros are not used, they give lousy code.
   7
   8 .text
   9 .define _htons, _ntohs
  10 _htons:
  11 _ntohs:
  12         mov     bx, sp
  13         movb    ah, 2(bx)       ! Load bytes into ax in reverse order
  14         movb    al, 3(bx)
  15         ret
  16
  17 .define _htonl, _ntohl
  18 _htonl:
  19 _ntohl:
  20         mov     bx, sp
  21         movb    dh, 2(bx)       ! Load bytes into dx:ax in reverse order
  22         movb    dl, 3(bx)
  23         movb    ah, 4(bx)
  24         movb    al, 5(bx)
  25         ret