include/ebcdic.h

   1 /*
   2  * (C) Copyright 2007-2011  Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
   3  *
   4  * This file is released under the GPLv2.  See the COPYING file for more
   5  * details.
   6  */
   7
   8 #ifndef __EBCDIC_H
   9 #define __EBCDIC_H
  10
  11 /* charset conversions */
  12 extern u8 ascii2ebcdic_table[256];
  13 extern u8 ebcdic2ascii_table[256];
  14
  15 /* ASCII transforms */
  16 extern u8 ascii2upper_table[256];
  17
  18 /*
  19  * Generic translate buffer function.
  20  */
  21 static inline void __translate(u8 *buf, int len, const u8 *table)
  22 {
  23         asm volatile(
  24                 "       sgr     %%r0,%%r0\n"            /* test byte = 0 */
  25                 "       la      %%r2,0(%0)\n"           /* buffer */
  26                 "       lgr     %%r3,%2\n"              /* length */
  27                 "       la      %%r4,0(%1)\n"           /* table */
  28                 "0:     tre     %%r2,%%r4\n"
  29                 "       brc     1,0b\n"
  30                 : /* output */
  31                 : /* input */
  32                   "a" (buf),
  33                   "a" (table),
  34                   "d" (len)
  35                 : /* clobbered */
  36                   "cc", "r0", "r2", "r3", "r4"
  37         );
  38 }
  39
  40 #define ascii2ebcdic(buf, len)  \
  41                         __translate((buf), (len), ascii2ebcdic_table)
  42 #define ebcdic2ascii(buf, len)  \
  43                         __translate((buf), (len), ebcdic2ascii_table)
  44
  45 #define ascii2upper(buf, len)   \
  46                         __translate((buf), (len), ascii2upper_table)
  47
  48 #endif