LXR linux/arch/avr32/include/asm/irqflags.h

   1/*
   2 * Copyright (C) 2004-2006 Atmel Corporation
   3 *
   4 * This program is free software; you can redistribute it and/or modify
   5 * it under the terms of the GNU General Public License version 2 as
   6 * published by the Free Software Foundation.
   7 */
   8#ifndef __ASM_AVR32_IRQFLAGS_H
   9#define __ASM_AVR32_IRQFLAGS_H
  10
  11#include <linux/types.h>
  12#include <asm/sysreg.h>
  13
  14static inline unsigned long arch_local_save_flags(void)
  15{
  16        return sysreg_read(SR);
  17}
  18
  19/*
  20 * This will restore ALL status register flags, not only the interrupt
  21 * mask flag.
  22 *
  23 * The empty asm statement informs the compiler of this fact while
  24 * also serving as a barrier.
  25 */
  26static inline void arch_local_irq_restore(unsigned long flags)
  27{
  28        sysreg_write(SR, flags);
  29        asm volatile("" : : : "memory", "cc");
  30}
  31
  32static inline void arch_local_irq_disable(void)
  33{
  34        asm volatile("ssrf %0" : : "n"(SYSREG_GM_OFFSET) : "memory");
  35}
  36
  37static inline void arch_local_irq_enable(void)
  38{
  39        asm volatile("csrf %0" : : "n"(SYSREG_GM_OFFSET) : "memory");
  40}
  41
  42static inline bool arch_irqs_disabled_flags(unsigned long flags)
  43{
  44        return (flags & SYSREG_BIT(GM)) != 0;
  45}
  46
  47static inline bool arch_irqs_disabled(void)
  48{
  49        return arch_irqs_disabled_flags(arch_local_save_flags());
  50}
  51
  52static inline unsigned long arch_local_irq_save(void)
  53{
  54        unsigned long flags = arch_local_save_flags();
  55
  56        arch_local_irq_disable();
  57
  58        return flags;
  59}
  60
  61#endif /* __ASM_AVR32_IRQFLAGS_H */
  62