include/asm-x86_64/irqflags.h

   1 /*
   2  * include/asm-x86_64/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  * raw_local_irq_*() macros from the lowlevel headers.
   9  */
  10 #ifndef _ASM_IRQFLAGS_H
  11 #define _ASM_IRQFLAGS_H
  12
  13 #ifndef __ASSEMBLY__
  14
  15 /* interrupt control.. */
  16 #define raw_local_save_flags(x) do { warn_if_not_ulong(x); __asm__ __volatile__("# save_flags \n\t pushfq ; popq %q0":"=g" (x): /* no input */ :"memory"); } while (0)
  17 #define raw_local_irq_restore(x)        __asm__ __volatile__("# restore_flags \n\t pushq %0 ; popfq": /* no output */ :"g" (x):"memory", "cc")
  18
  19 #ifdef CONFIG_X86_VSMP
  20 /* Interrupt control for VSMP  architecture */
  21 #define raw_local_irq_disable() do { unsigned long flags; raw_local_save_flags(flags); raw_local_irq_restore((flags & ~(1 << 9)) | (1 << 18)); } while (0)
  22 #define raw_local_irq_enable()  do { unsigned long flags; raw_local_save_flags(flags); raw_local_irq_restore((flags | (1 << 9)) & ~(1 << 18)); } while (0)
  23
  24 #define raw_irqs_disabled_flags(flags)  \
  25 ({                                              \
  26         (flags & (1<<18)) || !(flags & (1<<9)); \
  27 })
  28
  29 /* For spinlocks etc */
  30 #define raw_local_irq_save(x)   do { raw_local_save_flags(x); raw_local_irq_restore((x & ~(1 << 9)) | (1 << 18)); } while (0)
  31 #else  /* CONFIG_X86_VSMP */
  32 #define raw_local_irq_disable()         __asm__ __volatile__("cli": : :"memory")
  33 #define raw_local_irq_enable()  __asm__ __volatile__("sti": : :"memory")
  34
  35 #define raw_irqs_disabled_flags(flags)  \
  36 ({                                              \
  37         !(flags & (1<<9));                      \
  38 })
  39
  40 /* For spinlocks etc */
  41 #define raw_local_irq_save(x)   do { warn_if_not_ulong(x); __asm__ __volatile__("# raw_local_irq_save \n\t pushfq ; popq %0 ; cli":"=g" (x): /* no input */ :"memory"); } while (0)
  42 #endif
  43
  44 #define raw_irqs_disabled()                     \
  45 ({                                              \
  46         unsigned long flags;                    \
  47         raw_local_save_flags(flags);            \
  48         raw_irqs_disabled_flags(flags);         \
  49 })
  50
  51 /* used in the idle loop; sti takes one instruction cycle to complete */
  52 #define raw_safe_halt() __asm__ __volatile__("sti; hlt": : :"memory")
  53 /* used when interrupts are already enabled or to shutdown the processor */
  54 #define halt()                  __asm__ __volatile__("hlt": : :"memory")
  55
  56 #else /* __ASSEMBLY__: */
  57 # define TRACE_IRQS_ON
  58 # define TRACE_IRQS_OFF
  59 #endif
  60
  61 #endif