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 codepage_convert(const __u8 * codepage,volatile char * addr,unsigned long nr)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 48