include/asm-i386/mach-xen/asm/irqflags.h

   1 /*
   2  * include/asm-i386/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_*() functions from the lowlevel headers.
   9  */
  10 #ifndef _ASM_IRQFLAGS_H
  11 #define _ASM_IRQFLAGS_H
  12
  13 #ifdef CONFIG_PARAVIRT
  14 #include <asm/paravirt.h>
  15 #else
  16 #ifndef __ASSEMBLY__
  17
  18 unsigned long __raw_local_save_flags(void);
  19
  20 void raw_local_irq_restore(unsigned long flags);
  21 void raw_local_irq_disable(void);
  22 void raw_local_irq_enable(void);
  23
  24 /*
  25  * Used in the idle loop; sti takes one instruction cycle
  26  * to complete:
  27  */
  28 void raw_safe_halt(void);
  29
  30 /*
  31  * Used when interrupts are already enabled or to
  32  * shutdown the processor:
  33  */
  34 void halt(void);
  35
  36 /*
  37  * For spinlocks, etc:
  38  */
  39 unsigned long __raw_local_irq_save(void);
  40
  41 #else
  42 #define DISABLE_INTERRUPTS(clobbers)    GET_VCPU_INFO                           ; \
  43                                         __DISABLE_INTERRUPTS
  44 #define ENABLE_INTERRUPTS(clobbers)     GET_VCPU_INFO                           ; \
  45                                         __ENABLE_INTERRUPTS
  46 #define ENABLE_INTERRUPTS_SYSEXIT       NET_DONE_YET
  47 #define INTERRUPT_RETURN                iret
  48 #define GET_CR0_INTO_EAX                NOT_DONE_YET
  49 #endif /* __ASSEMBLY__ */
  50 #endif /* CONFIG_PARAVIRT */
  51
  52 #ifndef __ASSEMBLY__
  53 #define raw_local_save_flags(flags) \
  54                 do { (flags) = __raw_local_save_flags(); } while (0)
  55
  56 #define raw_local_irq_save(flags) \
  57                 do { (flags) = __raw_local_irq_save(); } while (0)
  58
  59 static inline int raw_irqs_disabled_flags(unsigned long flags)
  60 {
  61         return flags != 0;
  62 }
  63
  64 int raw_irqs_disabled(void);
  65 #endif /* __ASSEMBLY__ */
  66
  67 /*
  68  * Do the CPU's IRQ-state tracing from assembly code. We call a
  69  * C function, so save all the C-clobbered registers:
  70  */
  71 #ifdef CONFIG_TRACE_IRQFLAGS
  72
  73 # define TRACE_IRQS_ON                          \
  74         pushl %eax;                             \
  75         pushl %ecx;                             \
  76         pushl %edx;                             \
  77         call trace_hardirqs_on;                 \
  78         popl %edx;                              \
  79         popl %ecx;                              \
  80         popl %eax;
  81
  82 # define TRACE_IRQS_OFF                         \
  83         pushl %eax;                             \
  84         pushl %ecx;                             \
  85         pushl %edx;                             \
  86         call trace_hardirqs_off;                \
  87         popl %edx;                              \
  88         popl %ecx;                              \
  89         popl %eax;
  90
  91 #else
  92 # define TRACE_IRQS_ON
  93 # define TRACE_IRQS_OFF
  94 #endif
  95
  96 #endif