cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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ebcdic.h (1442B)

      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-- <= 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