LXR linux/include/asm-s390/ebcdic.h

   1/*
   2 *  include/asm-s390/ebcdic.h
   3 *    EBCDIC -> ASCII, ASCII -> EBCDIC conversion routines.
   4 *
   5 *  S390 version
   6 *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
   7 *    Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
   8 */
   9
  10#ifndef _EBCDIC_H
  11#define _EBCDIC_H
  12
  13#ifndef _S390_TYPES_H
  14#include <types.h>
  15#endif
  16
  17extern __u8 _ascebc_500[256];   /* ASCII -> EBCDIC 500 conversion table */
  18extern __u8 _ebcasc_500[256];   /* EBCDIC 500 -> ASCII conversion table */
  19extern __u8 _ascebc[256];   /* ASCII -> EBCDIC conversion table */
  20extern __u8 _ebcasc[256];   /* EBCDIC -> ASCII conversion table */
  21extern __u8 _ebc_tolower[256]; /* EBCDIC -> lowercase */
  22extern __u8 _ebc_toupper[256]; /* EBCDIC -> uppercase */
  23
  24static inline void
  25codepage_convert(const __u8 *codepage, volatile __u8 * addr, unsigned long nr)
  26{
  27        if (nr-- <= 0)
  28                return;
  29        asm volatile(
  30                "       bras    1,1f\n"
  31                "       tr      0(1,%0),0(%2)\n"
  32                "0:     tr      0(256,%0),0(%2)\n"
  33                "       la      %0,256(%0)\n"
  34                "1:     ahi     %1,-256\n"
  35                "       jnm     0b\n"
  36                "       ex      %1,0(1)"
  37                : "+&a" (addr), "+&a" (nr)
  38                : "a" (codepage) : "cc", "memory", "1");
  39}
  40
  41#define ASCEBC(addr,nr) codepage_convert(_ascebc, addr, nr)
  42#define EBCASC(addr,nr) codepage_convert(_ebcasc, addr, nr)
  43#define ASCEBC_500(addr,nr) codepage_convert(_ascebc_500, addr, nr)
  44#define EBCASC_500(addr,nr) codepage_convert(_ebcasc_500, addr, nr)
  45#define EBC_TOLOWER(addr,nr) codepage_convert(_ebc_tolower, addr, nr)
  46#define EBC_TOUPPER(addr,nr) codepage_convert(_ebc_toupper, addr, nr)
  47
  48#endif
  49
  50