include/nios2.h

   1 /*
   2  * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
   3  * Scott McNutt <smcnutt@psyent.com>
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #ifndef __NIOS2_H__
  25 #define __NIOS2_H__
  26
  27 /*------------------------------------------------------------------------
  28  * Control registers -- use with wrctl() & rdctl()
  29  *----------------------------------------------------------------------*/
  30 #define CTL_STATUS      0               /* Processor status reg         */
  31 #define CTL_ESTATUS     1               /* Exception status reg         */
  32 #define CTL_BSTATUS     2               /* Break status reg             */
  33 #define CTL_IENABLE     3               /* Interrut enable reg          */
  34 #define CTL_IPENDING    4               /* Interrut pending reg         */
  35
  36 /*------------------------------------------------------------------------
  37  * Access to control regs
  38  *----------------------------------------------------------------------*/
  39 #define _str_(x) #x
  40
  41 #define rdctl(reg)\
  42         ({unsigned int val;\
  43         asm volatile( "rdctl %0, ctl" _str_(reg)\
  44                 : "=r" (val) ); val;})
  45
  46 #define wrctl(reg,val)\
  47         asm volatile( "wrctl ctl" _str_(reg) ",%0"\
  48                 : : "r" (val))
  49
  50 /*------------------------------------------------------------------------
  51  * Control reg bit masks
  52  *----------------------------------------------------------------------*/
  53 #define STATUS_IE       (1<<0)          /* Interrupt enable             */
  54 #define STATUS_U        (1<<1)          /* User-mode                    */
  55
  56 /*------------------------------------------------------------------------
  57  * Bit-31 Cache bypass -- only valid for data access. When data cache
  58  * is not implemented, bit 31 is ignored for compatibility.
  59  *----------------------------------------------------------------------*/
  60 #define CACHE_BYPASS(a) ((a) | 0x80000000)
  61 #define CACHE_NO_BYPASS(a) ((a) & ~0x80000000)
  62
  63 #endif /* __NIOS2_H__ */