/* SPDX-License-Identifier: GPL-2.0 */
/*
 *    EBCDIC -> ASCII, ASCII -> EBCDIC conversion routines.
 *
 *  S390 version
 *    Copyright IBM Corp. 1999
 *    Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
 */

#ifndef _EBCDIC_H
#define _EBCDIC_H

#include <linux/types.h>

extern __u8 _ascebc_500[256];   /* ASCII -> EBCDIC 500 conversion table */
extern __u8 _ebcasc_500[256];   /* EBCDIC 500 -> ASCII conversion table */
extern __u8 _ascebc[256];   /* ASCII -> EBCDIC conversion table */
extern __u8 _ebcasc[256];   /* EBCDIC -> ASCII conversion table */
extern __u8 _ebc_tolower[256]; /* EBCDIC -> lowercase */
extern __u8 _ebc_toupper[256]; /* EBCDIC -> uppercase */

static inline void
codepage_convert(const __u8 *codepage, volatile char *addr, unsigned long nr)
{
	if (!nr--)
		return;
	asm volatile(
		"	j	2f\n"
		"0:	tr	0(1,%0),0(%2)\n"
		"1:	tr	0(256,%0),0(%2)\n"
		"	la	%0,256(%0)\n"
		"2:	aghi	%1,-256\n"
		"	jnm	1b\n"
		"	exrl	%1,0b"
		: "+&a" (addr), "+&a" (nr)
		: "a" (codepage) : "cc", "memory");
}

#define ASCEBC(addr,nr) codepage_convert(_ascebc, addr, nr)
#define EBCASC(addr,nr) codepage_convert(_ebcasc, addr, nr)
#define ASCEBC_500(addr,nr) codepage_convert(_ascebc_500, addr, nr)
#define EBCASC_500(addr,nr) codepage_convert(_ebcasc_500, addr, nr)
#define EBC_TOLOWER(addr,nr) codepage_convert(_ebc_tolower, addr, nr)
#define EBC_TOUPPER(addr,nr) codepage_convert(_ebc_toupper, addr, nr)

#endif