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

   1/*
   2 * Xtensa IRQ flags handling functions
   3 *
   4 * This file is subject to the terms and conditions of the GNU General Public
   5 * License.  See the file "COPYING" in the main directory of this archive
   6 * for more details.
   7 *
   8 * Copyright (C) 2001 - 2005 Tensilica Inc.
   9 */
  10
  11#ifndef _XTENSA_IRQFLAGS_H
  12#define _XTENSA_IRQFLAGS_H
  13
  14#include <linux/types.h>
  15
  16static inline unsigned long arch_local_save_flags(void)
  17{
  18        unsigned long flags;
  19        asm volatile("rsr %0, ps" : "=a" (flags));
  20        return flags;
  21}
  22
  23static inline unsigned long arch_local_irq_save(void)
  24{
  25        unsigned long flags;
  26        asm volatile("rsil %0, "__stringify(LOCKLEVEL)
  27                     : "=a" (flags) :: "memory");
  28        return flags;
  29}
  30
  31static inline void arch_local_irq_disable(void)
  32{
  33        arch_local_irq_save();
  34}
  35
  36static inline void arch_local_irq_enable(void)
  37{
  38        unsigned long flags;
  39        asm volatile("rsil %0, 0" : "=a" (flags) :: "memory");
  40}
  41
  42static inline void arch_local_irq_restore(unsigned long flags)
  43{
  44        asm volatile("wsr %0, ps; rsync"
  45                     :: "a" (flags) : "memory");
  46}
  47
  48static inline bool arch_irqs_disabled_flags(unsigned long flags)
  49{
  50#if XCHAL_EXCM_LEVEL < LOCKLEVEL || (1 << PS_EXCM_BIT) < LOCKLEVEL
  51#error "XCHAL_EXCM_LEVEL and 1<<PS_EXCM_BIT must be no less than LOCKLEVEL"
  52#endif
  53        return (flags & (PS_INTLEVEL_MASK | (1 << PS_EXCM_BIT))) >= LOCKLEVEL;
  54}
  55
  56static inline bool arch_irqs_disabled(void)
  57{
  58        return arch_irqs_disabled_flags(arch_local_save_flags());
  59}
  60
  61#endif /* _XTENSA_IRQFLAGS_H */
  62