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   1 /*
   2  *  include/asm-s390/irqflags.h
   3  *
   4  *    Copyright (C) IBM Corp. 2006
   5  *    Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
   6  */
   7
   8 #ifndef __ASM_IRQFLAGS_H
   9 #define __ASM_IRQFLAGS_H
  10
  11 #ifdef __KERNEL__
  12
  13 #if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
  14
  15 /* store then or system mask. */
  16 #define __raw_local_irq_stosm(__or)                                     \
  17 ({                                                                      \
  18         unsigned long __mask;                                           \
  19         asm volatile(                                                   \
  20                 "       stosm   %0,%1"                                  \
  21                 : "=Q" (__mask) : "i" (__or) : "memory");               \
  22         __mask;                                                         \
  23 })
  24
  25 /* store then and system mask. */
  26 #define __raw_local_irq_stnsm(__and)                                    \
  27 ({                                                                      \
  28         unsigned long __mask;                                           \
  29         asm volatile(                                                   \
  30                 "       stnsm   %0,%1"                                  \
  31                 : "=Q" (__mask) : "i" (__and) : "memory");              \
  32         __mask;                                                         \
  33 })
  34
  35 /* set system mask. */
  36 #define __raw_local_irq_ssm(__mask)                                     \
  37 ({                                                                      \
  38         asm volatile("ssm   %0" : : "Q" (__mask) : "memory");           \
  39 })
  40
  41 #else /* __GNUC__ */
  42
  43 /* store then or system mask. */
  44 #define __raw_local_irq_stosm(__or)                                     \
  45 ({                                                                      \
  46         unsigned long __mask;                                           \
  47         asm volatile(                                                   \
  48                 "       stosm   0(%1),%2"                               \
  49                 : "=m" (__mask)                                         \
  50                 : "a" (&__mask), "i" (__or) : "memory");                \
  51         __mask;                                                         \
  52 })
  53
  54 /* store then and system mask. */
  55 #define __raw_local_irq_stnsm(__and)                                    \
  56 ({                                                                      \
  57         unsigned long __mask;                                           \
  58         asm volatile(                                                   \
  59                 "       stnsm   0(%1),%2"                               \
  60                 : "=m" (__mask)                                         \
  61                 : "a" (&__mask), "i" (__and) : "memory");               \
  62         __mask;                                                         \
  63 })
  64
  65 /* set system mask. */
  66 #define __raw_local_irq_ssm(__mask)                                     \
  67 ({                                                                      \
  68         asm volatile(                                                   \
  69                 "       ssm     0(%0)"                                  \
  70                 : : "a" (&__mask), "m" (__mask) : "memory");            \
  71 })
  72
  73 #endif /* __GNUC__ */
  74
  75 /* interrupt control.. */
  76 static inline unsigned long raw_local_irq_enable(void)
  77 {
  78         return __raw_local_irq_stosm(0x03);
  79 }
  80
  81 static inline unsigned long raw_local_irq_disable(void)
  82 {
  83         return __raw_local_irq_stnsm(0xfc);
  84 }
  85
  86 #define raw_local_save_flags(x)                                         \
  87 do {                                                                    \
  88         typecheck(unsigned long, x);                                    \
  89         (x) = __raw_local_irq_stosm(0x00);                              \
  90 } while (0)
  91
  92 static inline void raw_local_irq_restore(unsigned long flags)
  93 {
  94         __raw_local_irq_ssm(flags);
  95 }
  96
  97 static inline int raw_irqs_disabled_flags(unsigned long flags)
  98 {
  99         return !(flags & (3UL << (BITS_PER_LONG - 8)));
 100 }
 101
 102 /* For spinlocks etc */
 103 #define raw_local_irq_save(x)   ((x) = raw_local_irq_disable())
 104
 105 #endif /* __KERNEL__ */
 106 #endif /* __ASM_IRQFLAGS_H */