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/ctype.h>
14 #include <linux/types.h>
15
16 extern __u8 _ascebc_500[256]; /* ASCII -> EBCDIC 500 conversion table */
17 extern __u8 _ebcasc_500[256]; /* EBCDIC 500 -> ASCII conversion table */
18 extern __u8 _ascebc[256]; /* ASCII -> EBCDIC conversion table */
19 extern __u8 _ebcasc[256]; /* EBCDIC -> ASCII conversion table */
20 extern __u8 _ebc_tolower[256]; /* EBCDIC -> lowercase */
21 extern __u8 _ebc_toupper[256]; /* EBCDIC -> uppercase */
22 extern const __u8 _ebctype_asc[256]; /* EBCDIC -> character classes */
23
24 #define __ismask_ebc_asc(x) (_ebctype_asc[(int)(unsigned char)(x)])
25 #define isprint_ebc_asc(c) ((__ismask_ebc_asc(c)&(_P|_U|_L|_D|_SP)) != 0)
26 #define isspace_ebc_asc(c) ((__ismask_ebc_asc(c)&(_S)) != 0)
27
28 static inline void
codepage_convert(const __u8 * codepage,volatile char * addr,unsigned long nr)29 codepage_convert(const __u8 *codepage, volatile char *addr, unsigned long nr)
30 {
31 if (!nr--)
32 return;
33 asm volatile(
34 " j 2f\n"
35 "0: tr 0(1,%0),0(%2)\n"
36 "1: tr 0(256,%0),0(%2)\n"
37 " la %0,256(%0)\n"
38 "2: aghi %1,-256\n"
39 " jnm 1b\n"
40 " exrl %1,0b"
41 : "+&a" (addr), "+&a" (nr)
42 : "a" (codepage) : "cc", "memory");
43 }
44
45 #define ASCEBC(addr,nr) codepage_convert(_ascebc, addr, nr)
46 #define EBCASC(addr,nr) codepage_convert(_ebcasc, addr, nr)
47 #define ASCEBC_500(addr,nr) codepage_convert(_ascebc_500, addr, nr)
48 #define EBCASC_500(addr,nr) codepage_convert(_ebcasc_500, addr, nr)
49 #define EBC_TOLOWER(addr,nr) codepage_convert(_ebc_tolower, addr, nr)
50 #define EBC_TOUPPER(addr,nr) codepage_convert(_ebc_toupper, addr, nr)
51
52 #endif
53
54