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. */
  35 static inline notrace void __arch_local_irq_ssm(unsigned long flags)
  36 {
  37         asm volatile("ssm   %0" : : "Q" (flags) : "memory");
  38 }
  39
  40 static inline notrace unsigned long arch_local_save_flags(void)
  41 {
  42         return __arch_local_irq_stnsm(0xff);
  43 }
  44
  45 static inline notrace unsigned long arch_local_irq_save(void)
  46 {
  47         return __arch_local_irq_stnsm(0xfc);
  48 }
  49
  50 static inline notrace void arch_local_irq_disable(void)
  51 {
  52         arch_local_irq_save();
  53 }
  54
  55 static inline notrace 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 */
  61 static inline notrace 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
  68 static inline notrace bool arch_irqs_disabled_flags(unsigned long flags)
  69 {
  70         return !(flags & ARCH_IRQ_ENABLED);
  71 }
  72
  73 static inline notrace bool arch_irqs_disabled(void)
  74 {
  75         return arch_irqs_disabled_flags(arch_local_save_flags());
  76 }
  77
  78 #endif /* __ASM_IRQFLAGS_H */