ebcdic.h

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/*
 *    EBCDIC -> ASCII, ASCII -> EBCDIC conversion routines.
 *
 *  S390 version
 *    Copyright IBM Corp. 1999
 *    Author(s): Martin Schwidefsky <[email protected]>
 */

#ifndef _EBCDIC_H
#define _EBCDIC_H

#ifndef _S390_TYPES_H
#include <types.h>
#endif

extern __u8 _ascebc_500[256];   /* ASCII -> EBCDIC 500 conversion table */
extern __u8 _ebcasc_500[256];   /* EBCDIC 500 -> ASCII conversion table */
extern __u8 _ascebc[256];   /* ASCII -> EBCDIC conversion table */
extern __u8 _ebcasc[256];   /* EBCDIC -> ASCII conversion table */
extern __u8 _ebc_tolower[256]; /* EBCDIC -> lowercase */
extern __u8 _ebc_toupper[256]; /* EBCDIC -> uppercase */

static inline void
codepage_convert(const __u8 *codepage, volatile __u8 * addr, unsigned long nr)
{
    if (nr-- <= 0)
        return;
    asm volatile(
        "   bras    1,1f\n"
        "   tr  0(1,%0),0(%2)\n"
        "0: tr  0(256,%0),0(%2)\n"
        "   la  %0,256(%0)\n"
        "1: ahi %1,-256\n"
        "   jnm 0b\n"
        "   ex  %1,0(1)"
        : "+&a" (addr), "+&a" (nr)
        : "a" (codepage) : "cc", "memory", "1");
}

#define ASCEBC(addr,nr) codepage_convert(_ascebc, addr, nr)
#define EBCASC(addr,nr) codepage_convert(_ebcasc, addr, nr)
#define ASCEBC_500(addr,nr) codepage_convert(_ascebc_500, addr, nr)
#define EBCASC_500(addr,nr) codepage_convert(_ebcasc_500, addr, nr)
#define EBC_TOLOWER(addr,nr) codepage_convert(_ebc_tolower, addr, nr)
#define EBC_TOUPPER(addr,nr) codepage_convert(_ebc_toupper, addr, nr)

#endif