kernel/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 #include <asm/kregs.h>
  15
  16 #ifdef CONFIG_IA64_DEBUG_IRQ
  17 extern unsigned long last_cli_ip;
  18 static inline void arch_maybe_save_ip(unsigned long flags)
  19 {
  20         if (flags & IA64_PSR_I)
  21                 last_cli_ip = ia64_getreg(_IA64_REG_IP);
  22 }
  23 #else
  24 #define arch_maybe_save_ip(flags) do {} while (0)
  25 #endif
  26
  27 /*
  28  * - clearing psr.i is implicitly serialized (visible by next insn)
  29  * - setting psr.i requires data serialization
  30  * - we need a stop-bit before reading PSR because we sometimes
  31  *   write a floating-point register right before reading the PSR
  32  *   and that writes to PSR.mfl
  33  */
  34
  35 static inline unsigned long arch_local_save_flags(void)
  36 {
  37         ia64_stop();
  38 #ifdef CONFIG_PARAVIRT
  39         return ia64_get_psr_i();
  40 #else
  41         return ia64_getreg(_IA64_REG_PSR);
  42 #endif
  43 }
  44
  45 static inline unsigned long arch_local_irq_save(void)
  46 {
  47         unsigned long flags = arch_local_save_flags();
  48
  49         ia64_stop();
  50         ia64_rsm(IA64_PSR_I);
  51         arch_maybe_save_ip(flags);
  52         return flags;
  53 }
  54
  55 static inline void arch_local_irq_disable(void)
  56 {
  57 #ifdef CONFIG_IA64_DEBUG_IRQ
  58         arch_local_irq_save();
  59 #else
  60         ia64_stop();
  61         ia64_rsm(IA64_PSR_I);
  62 #endif
  63 }
  64
  65 static inline void arch_local_irq_enable(void)
  66 {
  67         ia64_stop();
  68         ia64_ssm(IA64_PSR_I);
  69         ia64_srlz_d();
  70 }
  71
  72 static inline void arch_local_irq_restore(unsigned long flags)
  73 {
  74 #ifdef CONFIG_IA64_DEBUG_IRQ
  75         unsigned long old_psr = arch_local_save_flags();
  76 #endif
  77         ia64_intrin_local_irq_restore(flags & IA64_PSR_I);
  78         arch_maybe_save_ip(old_psr & ~flags);
  79 }
  80
  81 static inline bool arch_irqs_disabled_flags(unsigned long flags)
  82 {
  83         return (flags & IA64_PSR_I) == 0;
  84 }
  85
  86 static inline bool arch_irqs_disabled(void)
  87 {
  88         return arch_irqs_disabled_flags(arch_local_save_flags());
  89 }
  90
  91 static inline void arch_safe_halt(void)
  92 {
  93         arch_local_irq_enable();
  94         ia64_pal_halt_light();  /* PAL_HALT_LIGHT */
  95 }
  96
  97
  98 #endif /* _ASM_IA64_IRQFLAGS_H */