arch/ia64/include/asm/irqflags.h

   1 /*
   2  * IRQ flags defines.
   3  *
   4  * Copyright (C) 1998-2003 Hewlett-Packard Co
   5  *      David Mosberger-Tang <davidm@hpl.hp.com>
   6  * Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com>
   7  * Copyright (C) 1999 Don Dugger <don.dugger@intel.com>
   8  */
   9
  10 #ifndef _ASM_IA64_IRQFLAGS_H
  11 #define _ASM_IA64_IRQFLAGS_H
  12
  13 #include <asm/pal.h>
  14
  15 #ifdef CONFIG_IA64_DEBUG_IRQ
  16 extern unsigned long last_cli_ip;
  17 static inline void arch_maybe_save_ip(unsigned long flags)
  18 {
  19         if (flags & IA64_PSR_I)
  20                 last_cli_ip = ia64_getreg(_IA64_REG_IP);
  21 }
  22 #else
  23 #define arch_maybe_save_ip(flags) do {} while (0)
  24 #endif
  25
  26 /*
  27  * - clearing psr.i is implicitly serialized (visible by next insn)
  28  * - setting psr.i requires data serialization
  29  * - we need a stop-bit before reading PSR because we sometimes
  30  *   write a floating-point register right before reading the PSR
  31  *   and that writes to PSR.mfl
  32  */
  33
  34 static inline unsigned long arch_local_save_flags(void)
  35 {
  36         ia64_stop();
  37 #ifdef CONFIG_PARAVIRT
  38         return ia64_get_psr_i();
  39 #else
  40         return ia64_getreg(_IA64_REG_PSR);
  41 #endif
  42 }
  43
  44 static inline unsigned long arch_local_irq_save(void)
  45 {
  46         unsigned long flags = arch_local_save_flags();
  47
  48         ia64_stop();
  49         ia64_rsm(IA64_PSR_I);
  50         arch_maybe_save_ip(flags);
  51         return flags;
  52 }
  53
  54 static inline void arch_local_irq_disable(void)
  55 {
  56 #ifdef CONFIG_IA64_DEBUG_IRQ
  57         arch_local_irq_save();
  58 #else
  59         ia64_stop();
  60         ia64_rsm(IA64_PSR_I);
  61 #endif
  62 }
  63
  64 static inline void arch_local_irq_enable(void)
  65 {
  66         ia64_stop();
  67         ia64_ssm(IA64_PSR_I);
  68         ia64_srlz_d();
  69 }
  70
  71 static inline void arch_local_irq_restore(unsigned long flags)
  72 {
  73 #ifdef CONFIG_IA64_DEBUG_IRQ
  74         unsigned long old_psr = arch_local_save_flags();
  75 #endif
  76         ia64_intrin_local_irq_restore(flags & IA64_PSR_I);
  77         arch_maybe_save_ip(old_psr & ~flags);
  78 }
  79
  80 static inline bool arch_irqs_disabled_flags(unsigned long flags)
  81 {
  82         return (flags & IA64_PSR_I) == 0;
  83 }
  84
  85 static inline bool arch_irqs_disabled(void)
  86 {
  87         return arch_irqs_disabled_flags(arch_local_save_flags());
  88 }
  89
  90 static inline void arch_safe_halt(void)
  91 {
  92         arch_local_irq_enable();
  93         ia64_pal_halt_light();  /* PAL_HALT_LIGHT */
  94 }
  95
  96
  97 #endif /* _ASM_IA64_IRQFLAGS_H */