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
  15 extern __u8 _ascebc_500[256];   /* ASCII -> EBCDIC 500 conversion table */
  16 extern __u8 _ebcasc_500[256];   /* EBCDIC 500 -> ASCII conversion table */
  17 extern __u8 _ascebc[256];   /* ASCII -> EBCDIC conversion table */
  18 extern __u8 _ebcasc[256];   /* EBCDIC -> ASCII conversion table */
  19 extern __u8 _ebc_tolower[256]; /* EBCDIC -> lowercase */
  20 extern __u8 _ebc_toupper[256]; /* EBCDIC -> uppercase */
  21
  22 static inline void
  23 codepage_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