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 #ifdef CONFIG_IA64_DEBUG_IRQ
  14 extern unsigned long last_cli_ip;
  15 static inline void arch_maybe_save_ip(unsigned long flags)
  16 {
  17         if (flags & IA64_PSR_I)
  18                 last_cli_ip = ia64_getreg(_IA64_REG_IP);
  19 }
  20 #else
  21 #define arch_maybe_save_ip(flags) do {} while (0)
  22 #endif
  23
  24 /*
  25  * - clearing psr.i is implicitly serialized (visible by next insn)
  26  * - setting psr.i requires data serialization
  27  * - we need a stop-bit before reading PSR because we sometimes
  28  *   write a floating-point register right before reading the PSR
  29  *   and that writes to PSR.mfl
  30  */
  31
  32 static inline unsigned long arch_local_save_flags(void)
  33 {
  34         ia64_stop();
  35 #ifdef CONFIG_PARAVIRT
  36         return ia64_get_psr_i();
  37 #else
  38         return ia64_getreg(_IA64_REG_PSR);
  39 #endif
  40 }
  41
  42 static inline unsigned long arch_local_irq_save(void)
  43 {
  44         unsigned long flags = arch_local_save_flags();
  45
  46         ia64_stop();
  47         ia64_rsm(IA64_PSR_I);
  48         arch_maybe_save_ip(flags);
  49         return flags;
  50 }
  51
  52 static inline void arch_local_irq_disable(void)
  53 {
  54 #ifdef CONFIG_IA64_DEBUG_IRQ
  55         arch_local_irq_save();
  56 #else
  57         ia64_stop();
  58         ia64_rsm(IA64_PSR_I);
  59 #endif
  60 }
  61
  62 static inline void arch_local_irq_enable(void)
  63 {
  64         ia64_stop();
  65         ia64_ssm(IA64_PSR_I);
  66         ia64_srlz_d();
  67 }
  68
  69 static inline void arch_local_irq_restore(unsigned long flags)
  70 {
  71 #ifdef CONFIG_IA64_DEBUG_IRQ
  72         unsigned long old_psr = arch_local_save_flags();
  73 #endif
  74         ia64_intrin_local_irq_restore(flags & IA64_PSR_I);
  75         arch_maybe_save_ip(old_psr & ~flags);
  76 }
  77
  78 static inline bool arch_irqs_disabled_flags(unsigned long flags)
  79 {
  80         return (flags & IA64_PSR_I) == 0;
  81 }
  82
  83 static inline bool arch_irqs_disabled(void)
  84 {
  85         return arch_irqs_disabled_flags(arch_local_save_flags());
  86 }
  87
  88 static inline void arch_safe_halt(void)
  89 {
  90         ia64_pal_halt_light();  /* PAL_HALT_LIGHT */
  91 }
  92
  93
  94 #endif /* _ASM_IA64_IRQFLAGS_H */