LXR uboot/arch/nds32/include/asm/system.h

   1/*
   2 * Copyright (C) 2011 Andes Technology Corporation
   3 * Macpaul Lin, Andes Technology Corporation <macpaul@andestech.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., 51 Franklin St, Fifth Floor, Boston,
  21 * MA 02110-1301 USA
  22 */
  23
  24#ifndef __ASM_NDS_SYSTEM_H
  25#define __ASM_NDS_SYSTEM_H
  26
  27/*
  28 * Interrupt configuring macros.
  29 */
  30
  31extern int irq_flags;
  32
  33#define local_irq_enable() \
  34        __asm__ __volatile__ ( \
  35                "mfsr   %0, $psw\n\t" \
  36                "andi   %0, %0, 0x1\n\t" \
  37                "setgie.e\n\t" \
  38                : \
  39                : "r" (irq_flags) \
  40        )
  41
  42#define local_irq_disable() \
  43        do { \
  44                int __tmp_dummy; \
  45                __asm__ __volatile__ ( \
  46                        "mfsr   %0, $psw\n\t" \
  47                        "andi   %0, %0, 0x1\n\t" \
  48                        "setgie.d\n\t" \
  49                        "dsb\n\t" \
  50                        : "=r" (__tmp_dummy) \
  51                ); \
  52        } while (0)
  53
  54#define local_irq_save(x) \
  55        __asm__ __volatile__ ( \
  56                "mfsr   %0, $psw\n\t" \
  57                "andi   %0, %0, 0x1\n\t" \
  58                "setgie.d\n\t" \
  59                "dsb\n\t" \
  60                : "=&r" (x) \
  61        )
  62
  63#define local_save_flags(x) \
  64        __asm__ __volatile__ ( \
  65                "mfsr   %0, $psw\n\t" \
  66                "andi   %0, %0, 0x1\n\t" \
  67                "setgie.e\n\t" \
  68                "setgie.d\n\t" \
  69                : "=r" (x) \
  70        )
  71
  72#define irqs_enabled_from_flags(x) ((x) != 0x1f)
  73
  74#define local_irq_restore(x) \
  75        do { \
  76                if (irqs_enabled_from_flags(x)) \
  77                        local_irq_enable(); \
  78        } while (0)
  79
  80/*
  81 * Force strict CPU ordering.
  82 */
  83#define nop()                   asm volatile ("nop;\n\t" : : )
  84#define mb()                    asm volatile (""   : : : "memory")
  85#define rmb()                   asm volatile (""   : : : "memory")
  86#define wmb()                   asm volatile (""   : : : "memory")
  87
  88#endif  /* __ASM_NDS_SYSTEM_H */
  89