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
  18 extern unsigned long last_cli_ip;
  19 static 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
  36 static 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
  46 static 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
  56 static 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
  66 static inline void arch_local_irq_enable(void)
  67 {
  68         ia64_stop();
  69         ia64_ssm(IA64_PSR_I);
  70         ia64_srlz_d();
  71 }
  72
  73 static 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
  82 static inline bool arch_irqs_disabled_flags(unsigned long flags)
  83 {
  84         return (flags & IA64_PSR_I) == 0;
  85 }
  86
  87 static inline bool arch_irqs_disabled(void)
  88 {
  89         return arch_irqs_disabled_flags(arch_local_save_flags());
  90 }
  91
  92 static 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 */