arch/c6x/include/asm/irqflags.h

   1 /*
   2  *  C6X IRQ flag handling
   3  *
   4  * Copyright (C) 2010 Texas Instruments Incorporated
   5  * Written by Mark Salter (msalter@redhat.com)
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public Licence
   9  * as published by the Free Software Foundation; either version
  10  * 2 of the Licence, or (at your option) any later version.
  11  */
  12
  13 #ifndef _ASM_IRQFLAGS_H
  14 #define _ASM_IRQFLAGS_H
  15
  16 #ifndef __ASSEMBLY__
  17
  18 /* read interrupt enabled status */
  19 static inline unsigned long arch_local_save_flags(void)
  20 {
  21         unsigned long flags;
  22
  23         asm volatile (" mvc .s2 CSR,%0\n" : "=b"(flags));
  24         return flags;
  25 }
  26
  27 /* set interrupt enabled status */
  28 static inline void arch_local_irq_restore(unsigned long flags)
  29 {
  30         asm volatile (" mvc .s2 %0,CSR\n" : : "b"(flags) : "memory");
  31 }
  32
  33 /* unconditionally enable interrupts */
  34 static inline void arch_local_irq_enable(void)
  35 {
  36         unsigned long flags = arch_local_save_flags();
  37         flags |= 1;
  38         arch_local_irq_restore(flags);
  39 }
  40
  41 /* unconditionally disable interrupts */
  42 static inline void arch_local_irq_disable(void)
  43 {
  44         unsigned long flags = arch_local_save_flags();
  45         flags &= ~1;
  46         arch_local_irq_restore(flags);
  47 }
  48
  49 /* get status and disable interrupts */
  50 static inline unsigned long arch_local_irq_save(void)
  51 {
  52         unsigned long flags;
  53
  54         flags = arch_local_save_flags();
  55         arch_local_irq_restore(flags & ~1);
  56         return flags;
  57 }
  58
  59 /* test flags */
  60 static inline int arch_irqs_disabled_flags(unsigned long flags)
  61 {
  62         return (flags & 1) == 0;
  63 }
  64
  65 /* test hardware interrupt enable bit */
  66 static inline int arch_irqs_disabled(void)
  67 {
  68         return arch_irqs_disabled_flags(arch_local_save_flags());
  69 }
  70
  71 #endif /* __ASSEMBLY__ */
  72 #endif /* __ASM_IRQFLAGS_H */