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   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 #include <asm/processor-flags.h>
  13
  14 #ifndef __ASSEMBLY__
  15 static inline unsigned long native_save_fl(void)
  16 {
  17         unsigned long f;
  18         asm volatile("pushfl ; popl %0":"=g" (f): /* no input */);
  19         return f;
  20 }
  21
  22 static inline void native_restore_fl(unsigned long f)
  23 {
  24         asm volatile("pushl %0 ; popfl": /* no output */
  25                              :"g" (f)
  26                              :"memory", "cc");
  27 }
  28
  29 static inline void native_irq_disable(void)
  30 {
  31         asm volatile("cli": : :"memory");
  32 }
  33
  34 static inline void native_irq_enable(void)
  35 {
  36         asm volatile("sti": : :"memory");
  37 }
  38
  39 static inline void native_safe_halt(void)
  40 {
  41         asm volatile("sti; hlt": : :"memory");
  42 }
  43
  44 static inline void native_halt(void)
  45 {
  46         asm volatile("hlt": : :"memory");
  47 }
  48 #endif  /* __ASSEMBLY__ */
  49
  50 #ifdef CONFIG_PARAVIRT
  51 #include <asm/paravirt.h>
  52 #else
  53 #ifndef __ASSEMBLY__
  54
  55 static inline unsigned long __raw_local_save_flags(void)
  56 {
  57         return native_save_fl();
  58 }
  59
  60 static inline void raw_local_irq_restore(unsigned long flags)
  61 {
  62         native_restore_fl(flags);
  63 }
  64
  65 static inline void raw_local_irq_disable(void)
  66 {
  67         native_irq_disable();
  68 }
  69
  70 static inline void raw_local_irq_enable(void)
  71 {
  72         native_irq_enable();
  73 }
  74
  75 /*
  76  * Used in the idle loop; sti takes one instruction cycle
  77  * to complete:
  78  */
  79 static inline void raw_safe_halt(void)
  80 {
  81         native_safe_halt();
  82 }
  83
  84 /*
  85  * Used when interrupts are already enabled or to
  86  * shutdown the processor:
  87  */
  88 static inline void halt(void)
  89 {
  90         native_halt();
  91 }
  92
  93 /*
  94  * For spinlocks, etc:
  95  */
  96 static inline unsigned long __raw_local_irq_save(void)
  97 {
  98         unsigned long flags = __raw_local_save_flags();
  99
 100         raw_local_irq_disable();
 101
 102         return flags;
 103 }
 104
 105 #else
 106 #define DISABLE_INTERRUPTS(clobbers)    cli
 107 #define ENABLE_INTERRUPTS(clobbers)     sti
 108 #define ENABLE_INTERRUPTS_SYSEXIT       sti; sysexit
 109 #define INTERRUPT_RETURN                iret
 110 #define GET_CR0_INTO_EAX                movl %cr0, %eax
 111 #endif /* __ASSEMBLY__ */
 112 #endif /* CONFIG_PARAVIRT */
 113
 114 #ifndef __ASSEMBLY__
 115 #define raw_local_save_flags(flags) \
 116                 do { (flags) = __raw_local_save_flags(); } while (0)
 117
 118 #define raw_local_irq_save(flags) \
 119                 do { (flags) = __raw_local_irq_save(); } while (0)
 120
 121 static inline int raw_irqs_disabled_flags(unsigned long flags)
 122 {
 123         return !(flags & X86_EFLAGS_IF);
 124 }
 125
 126 static inline int raw_irqs_disabled(void)
 127 {
 128         unsigned long flags = __raw_local_save_flags();
 129
 130         return raw_irqs_disabled_flags(flags);
 131 }
 132 #endif /* __ASSEMBLY__ */
 133
 134 /*
 135  * Do the CPU's IRQ-state tracing from assembly code. We call a
 136  * C function, so save all the C-clobbered registers:
 137  */
 138 #ifdef CONFIG_TRACE_IRQFLAGS
 139
 140 # define TRACE_IRQS_ON                          \
 141         pushl %eax;                             \
 142         pushl %ecx;                             \
 143         pushl %edx;                             \
 144         call trace_hardirqs_on;                 \
 145         popl %edx;                              \
 146         popl %ecx;                              \
 147         popl %eax;
 148
 149 # define TRACE_IRQS_OFF                         \
 150         pushl %eax;                             \
 151         pushl %ecx;                             \
 152         pushl %edx;                             \
 153         call trace_hardirqs_off;                \
 154         popl %edx;                              \
 155         popl %ecx;                              \
 156         popl %eax;
 157
 158 #else
 159 # define TRACE_IRQS_ON
 160 # define TRACE_IRQS_OFF
 161 #endif
 162
 163 #endif