sysdeps/standalone/m68k/m68020/m68020.h

   1 /* Copyright (C) 1994, 1997 Free Software Foundation, Inc.
   2    Contributed by Joel Sherrill (jsherril@redstone-emh2.army.mil),
   3      On-Line Applications Research Corporation.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 /*  m68020.h
  22  *
  23  *  This file contains macros which are used to access MC68020
  24  *  registers which are not addressable by C.  These are
  25  *  useful when developing the board specific support.
  26  */
  27
  28 #ifndef m68020_h__
  29 #define m68020_h__
  30
  31 typedef void ( *mc68020_isr )( void );
  32
  33 #define disable_intr( level ) \
  34   { (level) = 0; \
  35     asm volatile ( "movew   %%sr,%0 ; \
  36                     orw     #0x0700,%%sr" \
  37                     : "=d" ((level)) : "0" ((level)) ); \
  38   }
  39
  40 #define enable_intr( level ) \
  41   { asm volatile ( "movew   %0,%%sr " \
  42                        : "=d" ((level)) : "0" ((level)) ); \
  43   }
  44
  45 #define flash_intr( level ) \
  46   { asm volatile ( "movew   %0,%%sr ; \
  47                     orw     #0x0700,%%sr" \
  48                        : "=d" ((level)) : "0" ((level)) ); \
  49   }
  50
  51 #define get_vbr( vbr ) \
  52   { (vbr) = 0; \
  53     asm volatile ( "movec   %%vbr,%0 " \
  54                        : "=a" (vbr) : "0" (vbr) ); \
  55   }
  56
  57 #define set_vbr( vbr ) \
  58   { register mc68020_isr *_vbr= (mc68020_isr *)(vbr); \
  59     asm volatile ( "movec   %0,%%vbr " \
  60                        : "=a" (_vbr) : "0" (_vbr) ); \
  61   }
  62
  63 #define enable_caching() \
  64   { register unsigned int _ctl=0x01; \
  65     asm volatile ( "movec   %0,%%cacr" \
  66                        : "=d" (_ctl) : "0" (_ctl) ); \
  67   }
  68
  69 #define delay( microseconds ) \
  70   { register unsigned int _delay=(microseconds); \
  71     register unsigned int _tmp=123; \
  72     asm volatile( "0: \
  73                      nbcd      %0 ; \
  74                      nbcd      %0 ; \
  75                      dbf       %1,0 " \
  76                   : "=d" (_tmp), "=d" (_delay) \
  77                   : "0"  (_tmp), "1"  (_delay) ); \
  78   }
  79
  80 #define enable_tracing()
  81 #define cause_intr( X )
  82 #define clear_intr( X )
  83
  84 extern mc68020_isr     M68Kvec[];   /* vector table address */
  85
  86 #endif
  87 /* end of include file */