LXR linux/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
  19extern unsigned int get_trigger_mask(void);
  20#else
  21
  22extern unsigned int global_trigger_mask;
  23
  24static inline unsigned int get_trigger_mask(void)
  25{
  26        return global_trigger_mask;
  27}
  28#endif
  29
  30static inline unsigned long arch_local_save_flags(void)
  31{
  32        return __core_reg_get(TXMASKI);
  33}
  34
  35static inline int arch_irqs_disabled_flags(unsigned long flags)
  36{
  37        return (flags & ~INTS_OFF_MASK) == 0;
  38}
  39
  40static 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
  47static 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 */
  59static 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
  69static inline void arch_local_irq_restore(unsigned long flags)
  70{
  71        asm volatile("MOV TXMASKI,%0\n" : : "r" (flags) : "memory");
  72}
  73
  74static 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> */
  83void arch_local_irq_enable(void);
  84#else
  85static 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) */
  94