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
  16 static 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
  23 static 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
  31 static inline void arch_local_irq_disable(void)
  32 {
  33         arch_local_irq_save();
  34 }
  35
  36 static inline void arch_local_irq_enable(void)
  37 {
  38         unsigned long flags;
  39         asm volatile("rsil %0, 0" : "=a" (flags) :: "memory");
  40 }
  41
  42 static inline void arch_local_irq_restore(unsigned long flags)
  43 {
  44         asm volatile("wsr %0, ps; rsync"
  45                      :: "a" (flags) : "memory");
  46 }
  47
  48 static 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
  56 static inline bool arch_irqs_disabled(void)
  57 {
  58         return arch_irqs_disabled_flags(arch_local_save_flags());
  59 }
  60
  61 #endif /* _XTENSA_IRQFLAGS_H */