LXR linux/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
  17extern unsigned long last_cli_ip;
  18static 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
  35static 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
  45static 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
  55static 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
  65static inline void arch_local_irq_enable(void)
  66{
  67        ia64_stop();
  68        ia64_ssm(IA64_PSR_I);
  69        ia64_srlz_d();
  70}
  71
  72static 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
  81static inline bool arch_irqs_disabled_flags(unsigned long flags)
  82{
  83        return (flags & IA64_PSR_I) == 0;
  84}
  85
  86static inline bool arch_irqs_disabled(void)
  87{
  88        return arch_irqs_disabled_flags(arch_local_save_flags());
  89}
  90
  91static 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 */
  99