LXR linux/arch/s390/include/asm/irqflags.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 *    Copyright IBM Corp. 2006, 2010
   4 *    Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
   5 */
   6
   7#ifndef __ASM_IRQFLAGS_H
   8#define __ASM_IRQFLAGS_H
   9
  10#include <linux/types.h>
  11
  12#define ARCH_IRQ_ENABLED        (3UL << (BITS_PER_LONG - 8))
  13
  14/* store then OR system mask. */
  15#define __arch_local_irq_stosm(__or)                                    \
  16({                                                                      \
  17        unsigned long __mask;                                           \
  18        asm volatile(                                                   \
  19                "       stosm   %0,%1"                                  \
  20                : "=Q" (__mask) : "i" (__or) : "memory");               \
  21        __mask;                                                         \
  22})
  23
  24/* store then AND system mask. */
  25#define __arch_local_irq_stnsm(__and)                                   \
  26({                                                                      \
  27        unsigned long __mask;                                           \
  28        asm volatile(                                                   \
  29                "       stnsm   %0,%1"                                  \
  30                : "=Q" (__mask) : "i" (__and) : "memory");              \
  31        __mask;                                                         \
  32})
  33
  34/* set system mask. */
  35static __always_inline void __arch_local_irq_ssm(unsigned long flags)
  36{
  37        asm volatile("ssm   %0" : : "Q" (flags) : "memory");
  38}
  39
  40static __always_inline unsigned long arch_local_save_flags(void)
  41{
  42        return __arch_local_irq_stnsm(0xff);
  43}
  44
  45static __always_inline unsigned long arch_local_irq_save(void)
  46{
  47        return __arch_local_irq_stnsm(0xfc);
  48}
  49
  50static __always_inline void arch_local_irq_disable(void)
  51{
  52        arch_local_irq_save();
  53}
  54
  55static __always_inline void arch_local_irq_enable(void)
  56{
  57        __arch_local_irq_stosm(0x03);
  58}
  59
  60/* This only restores external and I/O interrupt state */
  61static __always_inline void arch_local_irq_restore(unsigned long flags)
  62{
  63        /* only disabled->disabled and disabled->enabled is valid */
  64        if (flags & ARCH_IRQ_ENABLED)
  65                arch_local_irq_enable();
  66}
  67
  68static __always_inline bool arch_irqs_disabled_flags(unsigned long flags)
  69{
  70        return !(flags & ARCH_IRQ_ENABLED);
  71}
  72
  73static __always_inline bool arch_irqs_disabled(void)
  74{
  75        return arch_irqs_disabled_flags(arch_local_save_flags());
  76}
  77
  78#endif /* __ASM_IRQFLAGS_H */
  79