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

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 *    EBCDIC -> ASCII, ASCII -> EBCDIC conversion routines.
   4 *
   5 *  S390 version
   6 *    Copyright IBM Corp. 1999
   7 *    Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
   8 */
   9
  10#ifndef _EBCDIC_H
  11#define _EBCDIC_H
  12
  13#include <linux/types.h>
  14
  15extern __u8 _ascebc_500[256];   /* ASCII -> EBCDIC 500 conversion table */
  16extern __u8 _ebcasc_500[256];   /* EBCDIC 500 -> ASCII conversion table */
  17extern __u8 _ascebc[256];   /* ASCII -> EBCDIC conversion table */
  18extern __u8 _ebcasc[256];   /* EBCDIC -> ASCII conversion table */
  19extern __u8 _ebc_tolower[256]; /* EBCDIC -> lowercase */
  20extern __u8 _ebc_toupper[256]; /* EBCDIC -> uppercase */
  21
  22static inline void
  23codepage_convert(const __u8 *codepage, volatile char *addr, unsigned long nr)
  24{
  25        if (nr-- <= 0)
  26                return;
  27        asm volatile(
  28                "       bras    1,1f\n"
  29                "       tr      0(1,%0),0(%2)\n"
  30                "0:     tr      0(256,%0),0(%2)\n"
  31                "       la      %0,256(%0)\n"
  32                "1:     ahi     %1,-256\n"
  33                "       jnm     0b\n"
  34                "       ex      %1,0(1)"
  35                : "+&a" (addr), "+&a" (nr)
  36                : "a" (codepage) : "cc", "memory", "1");
  37}
  38
  39#define ASCEBC(addr,nr) codepage_convert(_ascebc, addr, nr)
  40#define EBCASC(addr,nr) codepage_convert(_ebcasc, addr, nr)
  41#define ASCEBC_500(addr,nr) codepage_convert(_ascebc_500, addr, nr)
  42#define EBCASC_500(addr,nr) codepage_convert(_ebcasc_500, addr, nr)
  43#define EBC_TOLOWER(addr,nr) codepage_convert(_ebc_tolower, addr, nr)
  44#define EBC_TOUPPER(addr,nr) codepage_convert(_ebc_toupper, addr, nr)
  45
  46#endif
  47
  48