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
  14 static 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  */
  26 static inline void arch_local_irq_restore(unsigned long flags)
  27 {
  28         sysreg_write(SR, flags);
  29         asm volatile("" : : : "memory", "cc");
  30 }
  31
  32 static inline void arch_local_irq_disable(void)
  33 {
  34         asm volatile("ssrf %0" : : "n"(SYSREG_GM_OFFSET) : "memory");
  35 }
  36
  37 static inline void arch_local_irq_enable(void)
  38 {
  39         asm volatile("csrf %0" : : "n"(SYSREG_GM_OFFSET) : "memory");
  40 }
  41
  42 static inline bool arch_irqs_disabled_flags(unsigned long flags)
  43 {
  44         return (flags & SYSREG_BIT(GM)) != 0;
  45 }
  46
  47 static inline bool arch_irqs_disabled(void)
  48 {
  49         return arch_irqs_disabled_flags(arch_local_save_flags());
  50 }
  51
  52 static 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 */