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