ebcdic.h

 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
15extern __u8 _ascebc_500[256];   /* ASCII -> EBCDIC 500 conversion table */
16extern __u8 _ebcasc_500[256];   /* EBCDIC 500 -> ASCII conversion table */
17extern __u8 _ascebc[256];   /* ASCII -> EBCDIC conversion table */
18extern __u8 _ebcasc[256];   /* EBCDIC -> ASCII conversion table */
19extern __u8 _ebc_tolower[256]; /* EBCDIC -> lowercase */
20extern __u8 _ebc_toupper[256]; /* EBCDIC -> uppercase */
21
22static inline void
23codepage_convert(const __u8 *codepage, volatile char *addr, unsigned long nr)
24{
25	if (!nr--)
26		return;
27	asm volatile(
28		"	j	2f\n"
29		"0:	tr	0(1,%0),0(%2)\n"
30		"1:	tr	0(256,%0),0(%2)\n"
31		"	la	%0,256(%0)\n"
32		"2:	aghi	%1,-256\n"
33		"	jnm	1b\n"
34		"	exrl	%1,0b"
35		: "+&a" (addr), "+&a" (nr)
36		: "a" (codepage) : "cc", "memory");
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