arch/sparc/include/asm/irqflags_64.h

   1 /*
   2  * include/asm/irqflags.h
   3  *
   4  * IRQ flags handling
   5  *
   6  * This file gets included from lowlevel asm headers too, to provide
   7  * wrapped versions of the local_irq_*() APIs, based on the
   8  * arch_local_irq_*() functions from the lowlevel headers.
   9  */
  10 #ifndef _ASM_IRQFLAGS_H
  11 #define _ASM_IRQFLAGS_H
  12
  13 #include <asm/pil.h>
  14
  15 #ifndef __ASSEMBLY__
  16
  17 static inline notrace unsigned long arch_local_save_flags(void)
  18 {
  19         unsigned long flags;
  20
  21         __asm__ __volatile__(
  22                 "rdpr   %%pil, %0"
  23                 : "=r" (flags)
  24         );
  25
  26         return flags;
  27 }
  28
  29 static inline notrace void arch_local_irq_restore(unsigned long flags)
  30 {
  31         __asm__ __volatile__(
  32                 "wrpr   %0, %%pil"
  33                 : /* no output */
  34                 : "r" (flags)
  35                 : "memory"
  36         );
  37 }
  38
  39 static inline notrace void arch_local_irq_disable(void)
  40 {
  41         __asm__ __volatile__(
  42                 "wrpr   %0, %%pil"
  43                 : /* no outputs */
  44                 : "i" (PIL_NORMAL_MAX)
  45                 : "memory"
  46         );
  47 }
  48
  49 static inline notrace void arch_local_irq_enable(void)
  50 {
  51         __asm__ __volatile__(
  52                 "wrpr   0, %%pil"
  53                 : /* no outputs */
  54                 : /* no inputs */
  55                 : "memory"
  56         );
  57 }
  58
  59 static inline notrace int arch_irqs_disabled_flags(unsigned long flags)
  60 {
  61         return (flags > 0);
  62 }
  63
  64 static inline notrace int arch_irqs_disabled(void)
  65 {
  66         return arch_irqs_disabled_flags(arch_local_save_flags());
  67 }
  68
  69 static inline notrace unsigned long arch_local_irq_save(void)
  70 {
  71         unsigned long flags, tmp;
  72
  73         /* Disable interrupts to PIL_NORMAL_MAX unless we already
  74          * are using PIL_NMI, in which case PIL_NMI is retained.
  75          *
  76          * The only values we ever program into the %pil are 0,
  77          * PIL_NORMAL_MAX and PIL_NMI.
  78          *
  79          * Since PIL_NMI is the largest %pil value and all bits are
  80          * set in it (0xf), it doesn't matter what PIL_NORMAL_MAX
  81          * actually is.
  82          */
  83         __asm__ __volatile__(
  84                 "rdpr   %%pil, %0\n\t"
  85                 "or     %0, %2, %1\n\t"
  86                 "wrpr   %1, 0x0, %%pil"
  87                 : "=r" (flags), "=r" (tmp)
  88                 : "i" (PIL_NORMAL_MAX)
  89                 : "memory"
  90         );
  91
  92         return flags;
  93 }
  94
  95 #endif /* (__ASSEMBLY__) */
  96
  97 #endif /* !(_ASM_IRQFLAGS_H) */