arch/nios2/include/asm/system.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 #ifndef __ASM_NIOS2_SYSTEM_H_
  24 #define __ASM_NIOS2_SYSTEM_H_
  25
  26 #define local_irq_enable() __asm__ __volatile__ (  \
  27         "rdctl  r8, status\n"                      \
  28         "ori    r8, r8, 1\n"                       \
  29         "wrctl  status, r8\n"                      \
  30         : : : "r8")
  31
  32 #define local_irq_disable() __asm__ __volatile__ ( \
  33         "rdctl  r8, status\n"                      \
  34         "andi   r8, r8, 0xfffe\n"                  \
  35         "wrctl  status, r8\n"                      \
  36         : : : "r8")
  37
  38 #define local_save_flags(x) __asm__ __volatile__ (      \
  39         "rdctl  r8, status\n"                           \
  40         "mov    %0, r8\n"                               \
  41         : "=r" (x) : : "r8", "memory")
  42
  43 #define local_irq_restore(x) __asm__ __volatile__ (     \
  44         "mov    r8, %0\n"                               \
  45         "wrctl  status, r8\n"                           \
  46         : : "r" (x) : "r8", "memory")
  47
  48 /* For spinlocks etc */
  49 #define local_irq_save(x) do { local_save_flags(x); local_irq_disable(); } \
  50         while (0)
  51
  52 #define irqs_disabled()                                 \
  53 ({                                                      \
  54         unsigned long flags;                            \
  55         local_save_flags(flags);                        \
  56         ((flags & NIOS2_STATUS_PIE_MSK) == 0x0);        \
  57 })
  58
  59 #endif /* __ASM_NIOS2_SYSTEM_H */