include/asm/ebcdic.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 /*
0003  *    EBCDIC -> ASCII, ASCII -> EBCDIC conversion routines.
0004  *
0005  *  S390 version
0006  *    Copyright IBM Corp. 1999
0007  *    Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
0008  */
0009
0010 #ifndef _EBCDIC_H
0011 #define _EBCDIC_H
0012
0013 #include <linux/types.h>
0014
0015 extern __u8 _ascebc_500[256];   /* ASCII -> EBCDIC 500 conversion table */
0016 extern __u8 _ebcasc_500[256];   /* EBCDIC 500 -> ASCII conversion table */
0017 extern __u8 _ascebc[256];   /* ASCII -> EBCDIC conversion table */
0018 extern __u8 _ebcasc[256];   /* EBCDIC -> ASCII conversion table */
0019 extern __u8 _ebc_tolower[256]; /* EBCDIC -> lowercase */
0020 extern __u8 _ebc_toupper[256]; /* EBCDIC -> uppercase */
0021
0022 static inline void
0023 codepage_convert(const __u8 *codepage, volatile char *addr, unsigned long nr)
0024 {
0025     if (nr-- <= 0)
0026         return;
0027     asm volatile(
0028         "   bras    1,1f\n"
0029         "   tr  0(1,%0),0(%2)\n"
0030         "0: tr  0(256,%0),0(%2)\n"
0031         "   la  %0,256(%0)\n"
0032         "1: ahi %1,-256\n"
0033         "   jnm 0b\n"
0034         "   ex  %1,0(1)"
0035         : "+&a" (addr), "+&a" (nr)
0036         : "a" (codepage) : "cc", "memory", "1");
0037 }
0038
0039 #define ASCEBC(addr,nr) codepage_convert(_ascebc, addr, nr)
0040 #define EBCASC(addr,nr) codepage_convert(_ebcasc, addr, nr)
0041 #define ASCEBC_500(addr,nr) codepage_convert(_ascebc_500, addr, nr)
0042 #define EBCASC_500(addr,nr) codepage_convert(_ebcasc_500, addr, nr)
0043 #define EBC_TOLOWER(addr,nr) codepage_convert(_ebc_tolower, addr, nr)
0044 #define EBC_TOUPPER(addr,nr) codepage_convert(_ebc_toupper, addr, nr)
0045
0046 #endif
0047