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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