release/src-rt-6.x.4708/linux/linux-2.6.36/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 <asm/sysreg.h>
  12
  13 static inline unsigned long __raw_local_save_flags(void)
  14 {
  15         return sysreg_read(SR);
  16 }
  17
  18 #define raw_local_save_flags(x)                                 \
  19         do { (x) = __raw_local_save_flags(); } while (0)
  20
  21 /*
  22  * This will restore ALL status register flags, not only the interrupt
  23  * mask flag.
  24  *
  25  * The empty asm statement informs the compiler of this fact while
  26  * also serving as a barrier.
  27  */
  28 static inline void raw_local_irq_restore(unsigned long flags)
  29 {
  30         sysreg_write(SR, flags);
  31         asm volatile("" : : : "memory", "cc");
  32 }
  33
  34 static inline void raw_local_irq_disable(void)
  35 {
  36         asm volatile("ssrf %0" : : "n"(SYSREG_GM_OFFSET) : "memory");
  37 }
  38
  39 static inline void raw_local_irq_enable(void)
  40 {
  41         asm volatile("csrf %0" : : "n"(SYSREG_GM_OFFSET) : "memory");
  42 }
  43
  44 static inline int raw_irqs_disabled_flags(unsigned long flags)
  45 {
  46         return (flags & SYSREG_BIT(GM)) != 0;
  47 }
  48
  49 static inline int raw_irqs_disabled(void)
  50 {
  51         unsigned long flags = __raw_local_save_flags();
  52
  53         return raw_irqs_disabled_flags(flags);
  54 }
  55
  56 static inline unsigned long __raw_local_irq_save(void)
  57 {
  58         unsigned long flags = __raw_local_save_flags();
  59
  60         raw_local_irq_disable();
  61
  62         return flags;
  63 }
  64
  65 #define raw_local_irq_save(flags)                               \
  66         do { (flags) = __raw_local_irq_save(); } while (0)
  67
  68 #endif /* __ASM_AVR32_IRQFLAGS_H */