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

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