LXR linux/arch/ia64/include/asm/irqflags.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * IRQ flags defines.
   4 *
   5 * Copyright (C) 1998-2003 Hewlett-Packard Co
   6 *      David Mosberger-Tang <davidm@hpl.hp.com>
   7 * Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com>
   8 * Copyright (C) 1999 Don Dugger <don.dugger@intel.com>
   9 */
  10
  11#ifndef _ASM_IA64_IRQFLAGS_H
  12#define _ASM_IA64_IRQFLAGS_H
  13
  14#include <asm/pal.h>
  15#include <asm/kregs.h>
  16
  17#ifdef CONFIG_IA64_DEBUG_IRQ
  18extern unsigned long last_cli_ip;
  19static inline void arch_maybe_save_ip(unsigned long flags)
  20{
  21        if (flags & IA64_PSR_I)
  22                last_cli_ip = ia64_getreg(_IA64_REG_IP);
  23}
  24#else
  25#define arch_maybe_save_ip(flags) do {} while (0)
  26#endif
  27
  28/*
  29 * - clearing psr.i is implicitly serialized (visible by next insn)
  30 * - setting psr.i requires data serialization
  31 * - we need a stop-bit before reading PSR because we sometimes
  32 *   write a floating-point register right before reading the PSR
  33 *   and that writes to PSR.mfl
  34 */
  35
  36static inline unsigned long arch_local_save_flags(void)
  37{
  38        ia64_stop();
  39#ifdef CONFIG_PARAVIRT
  40        return ia64_get_psr_i();
  41#else
  42        return ia64_getreg(_IA64_REG_PSR);
  43#endif
  44}
  45
  46static inline unsigned long arch_local_irq_save(void)
  47{
  48        unsigned long flags = arch_local_save_flags();
  49
  50        ia64_stop();
  51        ia64_rsm(IA64_PSR_I);
  52        arch_maybe_save_ip(flags);
  53        return flags;
  54}
  55
  56static inline void arch_local_irq_disable(void)
  57{
  58#ifdef CONFIG_IA64_DEBUG_IRQ
  59        arch_local_irq_save();
  60#else
  61        ia64_stop();
  62        ia64_rsm(IA64_PSR_I);
  63#endif
  64}
  65
  66static inline void arch_local_irq_enable(void)
  67{
  68        ia64_stop();
  69        ia64_ssm(IA64_PSR_I);
  70        ia64_srlz_d();
  71}
  72
  73static inline void arch_local_irq_restore(unsigned long flags)
  74{
  75#ifdef CONFIG_IA64_DEBUG_IRQ
  76        unsigned long old_psr = arch_local_save_flags();
  77#endif
  78        ia64_intrin_local_irq_restore(flags & IA64_PSR_I);
  79        arch_maybe_save_ip(old_psr & ~flags);
  80}
  81
  82static inline bool arch_irqs_disabled_flags(unsigned long flags)
  83{
  84        return (flags & IA64_PSR_I) == 0;
  85}
  86
  87static inline bool arch_irqs_disabled(void)
  88{
  89        return arch_irqs_disabled_flags(arch_local_save_flags());
  90}
  91
  92static inline void arch_safe_halt(void)
  93{
  94        arch_local_irq_enable();
  95        ia64_pal_halt_light();  /* PAL_HALT_LIGHT */
  96}
  97
  98
  99#endif /* _ASM_IA64_IRQFLAGS_H */
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