include/nios.h

   1 /*
   2  * (C) Copyright 2003, 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 __NIOS_H__
  25 #define __NIOS_H__
  26
  27 /*------------------------------------------------------------------------
  28  * Control registers -- use with wrctl() & rdctl()
  29  *----------------------------------------------------------------------*/
  30 #define CTL_STATUS      0x00            /* Processor status             */
  31 #define CTL_ISTATUS     0x01            /* Saved status (exception)     */
  32 #define CTL_WVALID      0x02            /* Valid window limit           */
  33 #define CTL_ICACHE      0x05            /* I-cache line-invalidate      */
  34 #define CTL_CPU_ID      0x06            /* CPU version id               */
  35 #define CTL_DCACHE      0x07            /* D-cache line-invalidate      */
  36 #define CTL_CLR_IE      0x08            /* Interrupt clear (disable)    */
  37 #define CTL_SET_IE      0x09            /* Interrupt set (enable)       */
  38
  39 /*------------------------------------------------------------------------
  40  * Access to control regs
  41  *----------------------------------------------------------------------*/
  42 #define _str_(s)        #s
  43
  44 #define rdctl(reg)\
  45         ({unsigned int val;\
  46         asm volatile( "pfx " _str_(reg) "\n\t rdctl %0"\
  47                 : "=r" (val) ); val;})
  48
  49 #define wrctl(reg,val)\
  50         asm volatile( "pfx " _str_(reg) "\n\t wrctl %0 \n\t nop"\
  51                 : : "r" (val))
  52
  53 /*------------------------------------------------------------------------
  54  * Control reg bit masks
  55  *----------------------------------------------------------------------*/
  56 #define STATUS_DC       (1<<17)         /* Data cache enable            */
  57 #define STATUS_IC       (1<<16)         /* Instruction cache enable     */
  58 #define STATUS_IE       (1<<15)         /* Interrupt enable             */
  59 #define STATUS_IPRI     (0x3f<<9)       /* Interrupt priority           */
  60 #define STATUS_CWP      (0x1f<<4)       /* Current window pointer       */
  61 #define STATUS_N        (1<<3)          /* Condition code: negative     */
  62 #define STATUS_V        (1<<2)          /* Condition code: overflow     */
  63 #define STATUS_Z        (1<<1)          /* Condition code: zero         */
  64 #define STATUS_C        (1<<0)          /* Condition code: carry/borrow */
  65
  66 static inline unsigned ipri( unsigned prio )
  67 {
  68         unsigned tmp;
  69         unsigned status = rdctl(CTL_STATUS);
  70         prio = (prio << 9) & STATUS_IPRI;
  71         tmp = (status & ~STATUS_IPRI) | prio;
  72         wrctl(CTL_STATUS,tmp);
  73         return( (status & STATUS_IPRI) >> 9);
  74 }
  75
  76
  77 #endif /* __NIOS_H__ */