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 <[email protected]>
   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 __always_inline void __arch_local_irq_ssm(unsigned long flags)
  36 {
  37         asm volatile("ssm   %0" : : "Q" (flags) : "memory");
  38 }
  39
  40 #ifdef CONFIG_KMSAN
  41 #define arch_local_irq_attributes noinline notrace __no_sanitize_memory __maybe_unused
  42 #else
  43 #define arch_local_irq_attributes __always_inline
  44 #endif
  45
  46 static arch_local_irq_attributes unsigned long arch_local_save_flags(void)
  47 {
  48         return __arch_local_irq_stnsm(0xff);
  49 }
  50
  51 static arch_local_irq_attributes unsigned long arch_local_irq_save(void)
  52 {
  53         return __arch_local_irq_stnsm(0xfc);
  54 }
  55
  56 static __always_inline void arch_local_irq_disable(void)
  57 {
  58         arch_local_irq_save();
  59 }
  60
  61 static arch_local_irq_attributes void arch_local_irq_enable_external(void)
  62 {
  63         __arch_local_irq_stosm(0x01);
  64 }
  65
  66 static arch_local_irq_attributes void arch_local_irq_enable(void)
  67 {
  68         __arch_local_irq_stosm(0x03);
  69 }
  70
  71 /* This only restores external and I/O interrupt state */
  72 static __always_inline void arch_local_irq_restore(unsigned long flags)
  73 {
  74         /* only disabled->disabled and disabled->enabled is valid */
  75         if (flags & ARCH_IRQ_ENABLED)
  76                 arch_local_irq_enable();
  77 }
  78
  79 static __always_inline bool arch_irqs_disabled_flags(unsigned long flags)
  80 {
  81         return !(flags & ARCH_IRQ_ENABLED);
  82 }
  83
  84 static __always_inline bool arch_irqs_disabled(void)
  85 {
  86         return arch_irqs_disabled_flags(arch_local_save_flags());
  87 }
  88
  89 #endif /* __ASM_IRQFLAGS_H */