sysdeps/standalone/m68k/m68020/m68020.h

   1 /* Copyright (C) 1994 Free Software Foundation, Inc.
   2    Contributed by Joel Sherrill (jsherril@redstone-emh2.army.mil),
   3      On-Line Applications Research Corporation.
   4
   5 This file is part of the GNU C Library.
   6
   7 The GNU C Library is free software; you can redistribute it and/or
   8 modify it under the terms of the GNU Library General Public License as
   9 published by the Free Software Foundation; either version 2 of the
  10 License, or (at your option) any later version.
  11
  12 The GNU C Library is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15 Library General Public License for more details.
  16
  17 You should have received a copy of the GNU Library General Public
  18 License along with the GNU C Library; see the file COPYING.LIB.  If
  19 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  20 Cambridge, MA 02139, USA.  */
  21
  22 /*  m68020.h
  23  *
  24  *  This file contains macros which are used to access MC68020
  25  *  registers which are not addressable by C.  These are
  26  *  useful when developing the board specific support.
  27  */
  28
  29 #ifndef m68020_h__
  30 #define m68020_h__
  31
  32 typedef void ( *mc68020_isr )( void );
  33
  34 #define disable_intr( level ) \
  35   { (level) = 0; \
  36     asm volatile ( "movew   %%sr,%0 ; \
  37                     orw     #0x0700,%%sr" \
  38                     : "=d" ((level)) : "0" ((level)) ); \
  39   }
  40
  41 #define enable_intr( level ) \
  42   { asm volatile ( "movew   %0,%%sr " \
  43                        : "=d" ((level)) : "0" ((level)) ); \
  44   }
  45
  46 #define flash_intr( level ) \
  47   { asm volatile ( "movew   %0,%%sr ; \
  48                     orw     #0x0700,%%sr" \
  49                        : "=d" ((level)) : "0" ((level)) ); \
  50   }
  51
  52 #define get_vbr( vbr ) \
  53   { (vbr) = 0; \
  54     asm volatile ( "movec   %%vbr,%0 " \
  55                        : "=a" (vbr) : "0" (vbr) ); \
  56   }
  57
  58 #define set_vbr( vbr ) \
  59   { register mc68020_isr *_vbr= (mc68020_isr *)(vbr); \
  60     asm volatile ( "movec   %0,%%vbr " \
  61                        : "=a" (_vbr) : "0" (_vbr) ); \
  62   }
  63
  64 #define enable_caching() \
  65   { register unsigned int _ctl=0x01; \
  66     asm volatile ( "movec   %0,%%cacr" \
  67                        : "=d" (_ctl) : "0" (_ctl) ); \
  68   }
  69
  70 #define delay( microseconds ) \
  71   { register unsigned int _delay=(microseconds); \
  72     register unsigned int _tmp=123; \
  73     asm volatile( "0: \
  74                      nbcd      %0 ; \
  75                      nbcd      %0 ; \
  76                      dbf       %1,0 " \
  77                   : "=d" (_tmp), "=d" (_delay) \
  78                   : "0"  (_tmp), "1"  (_delay) ); \
  79   }
  80
  81 #define enable_tracing()
  82 #define cause_intr( X )
  83 #define clear_intr( X )
  84
  85 extern mc68020_isr     M68Kvec[];   /* vector table address */
  86
  87 #endif
  88 /* end of include file */