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. */
  34 static inline notrace void __arch_local_irq_ssm(unsigned long flags)
  35 {
  36         asm volatile("ssm   %0" : : "Q" (flags) : "memory");
  37 }
  38
  39 static inline notrace unsigned long arch_local_save_flags(void)
  40 {
  41         return __arch_local_irq_stnsm(0xff);
  42 }
  43
  44 static inline notrace unsigned long arch_local_irq_save(void)
  45 {
  46         return __arch_local_irq_stnsm(0xfc);
  47 }
  48
  49 static inline notrace void arch_local_irq_disable(void)
  50 {
  51         arch_local_irq_save();
  52 }
  53
  54 static 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 */
  60 static 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
  67 static inline notrace bool arch_irqs_disabled_flags(unsigned long flags)
  68 {
  69         return !(flags & ARCH_IRQ_ENABLED);
  70 }
  71
  72 static 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 */