arch/metag/include/asm/irqflags.h

   1 /*
   2  * IRQ flags handling
   3  *
   4  * This file gets included from lowlevel asm headers too, to provide
   5  * wrapped versions of the local_irq_*() APIs, based on the
   6  * raw_local_irq_*() functions from the lowlevel headers.
   7  */
   8 #ifndef _ASM_IRQFLAGS_H
   9 #define _ASM_IRQFLAGS_H
  10
  11 #ifndef __ASSEMBLY__
  12
  13 #include <asm/core_reg.h>
  14 #include <asm/metag_regs.h>
  15
  16 #define INTS_OFF_MASK TXSTATI_BGNDHALT_BIT
  17
  18 #ifdef CONFIG_SMP
  19 extern unsigned int get_trigger_mask(void);
  20 #else
  21
  22 extern unsigned int global_trigger_mask;
  23
  24 static inline unsigned int get_trigger_mask(void)
  25 {
  26         return global_trigger_mask;
  27 }
  28 #endif
  29
  30 static inline unsigned long arch_local_save_flags(void)
  31 {
  32         return __core_reg_get(TXMASKI);
  33 }
  34
  35 static inline int arch_irqs_disabled_flags(unsigned long flags)
  36 {
  37         return (flags & ~INTS_OFF_MASK) == 0;
  38 }
  39
  40 static inline int arch_irqs_disabled(void)
  41 {
  42         unsigned long flags = arch_local_save_flags();
  43
  44         return arch_irqs_disabled_flags(flags);
  45 }
  46
  47 static inline unsigned long __irqs_disabled(void)
  48 {
  49         /*
  50          * We shouldn't enable exceptions if they are not already
  51          * enabled. This is required for chancalls to work correctly.
  52          */
  53         return arch_local_save_flags() & INTS_OFF_MASK;
  54 }
  55
  56 /*
  57  * For spinlocks, etc:
  58  */
  59 static inline unsigned long arch_local_irq_save(void)
  60 {
  61         unsigned long flags = __irqs_disabled();
  62
  63         asm volatile("SWAP %0,TXMASKI\n" : "=r" (flags) : "0" (flags)
  64                      : "memory");
  65
  66         return flags;
  67 }
  68
  69 static inline void arch_local_irq_restore(unsigned long flags)
  70 {
  71         asm volatile("MOV TXMASKI,%0\n" : : "r" (flags) : "memory");
  72 }
  73
  74 static inline void arch_local_irq_disable(void)
  75 {
  76         unsigned long flags = __irqs_disabled();
  77
  78         asm volatile("MOV TXMASKI,%0\n" : : "r" (flags) : "memory");
  79 }
  80
  81 #ifdef CONFIG_SMP
  82 /* Avoid circular include dependencies through <linux/preempt.h> */
  83 void arch_local_irq_enable(void);
  84 #else
  85 static inline void arch_local_irq_enable(void)
  86 {
  87         arch_local_irq_restore(get_trigger_mask());
  88 }
  89 #endif
  90
  91 #endif /* (__ASSEMBLY__) */
  92
  93 #endif /* !(_ASM_IRQFLAGS_H) */