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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
  13 #ifdef CONFIG_PARAVIRT
  14 #include <asm/paravirt.h>
  15 #else
  16 #ifndef __ASSEMBLY__
  17
  18 static inline unsigned long __raw_local_save_flags(void)
  19 {
  20         unsigned long flags;
  21
  22         __asm__ __volatile__(
  23                 "pushfl ; popl %0"
  24                 : "=g" (flags)
  25                 : /* no input */
  26         );
  27
  28         return flags;
  29 }
  30
  31 static inline void raw_local_irq_restore(unsigned long flags)
  32 {
  33         __asm__ __volatile__(
  34                 "pushl %0 ; popfl"
  35                 : /* no output */
  36                 :"g" (flags)
  37                 :"memory", "cc"
  38         );
  39 }
  40
  41 static inline void raw_local_irq_disable(void)
  42 {
  43         __asm__ __volatile__("cli" : : : "memory");
  44 }
  45
  46 static inline void raw_local_irq_enable(void)
  47 {
  48         __asm__ __volatile__("sti" : : : "memory");
  49 }
  50
  51 /*
  52  * Used in the idle loop; sti takes one instruction cycle
  53  * to complete:
  54  */
  55 static inline void raw_safe_halt(void)
  56 {
  57         __asm__ __volatile__("sti; hlt" : : : "memory");
  58 }
  59
  60 /*
  61  * Used when interrupts are already enabled or to
  62  * shutdown the processor:
  63  */
  64 static inline void halt(void)
  65 {
  66         __asm__ __volatile__("hlt": : :"memory");
  67 }
  68
  69 /*
  70  * For spinlocks, etc:
  71  */
  72 static inline unsigned long __raw_local_irq_save(void)
  73 {
  74         unsigned long flags = __raw_local_save_flags();
  75
  76         raw_local_irq_disable();
  77
  78         return flags;
  79 }
  80
  81 #else
  82 #define DISABLE_INTERRUPTS(clobbers)    cli
  83 #define ENABLE_INTERRUPTS(clobbers)     sti
  84 #define ENABLE_INTERRUPTS_SYSEXIT       sti; sysexit
  85 #define INTERRUPT_RETURN                iret
  86 #define GET_CR0_INTO_EAX                movl %cr0, %eax
  87 #endif /* __ASSEMBLY__ */
  88 #endif /* CONFIG_PARAVIRT */
  89
  90 #ifndef __ASSEMBLY__
  91 #define raw_local_save_flags(flags) \
  92                 do { (flags) = __raw_local_save_flags(); } while (0)
  93
  94 #define raw_local_irq_save(flags) \
  95                 do { (flags) = __raw_local_irq_save(); } while (0)
  96
  97 static inline int raw_irqs_disabled_flags(unsigned long flags)
  98 {
  99         return !(flags & (1 << 9));
 100 }
 101
 102 static inline int raw_irqs_disabled(void)
 103 {
 104         unsigned long flags = __raw_local_save_flags();
 105
 106         return raw_irqs_disabled_flags(flags);
 107 }
 108 #endif /* __ASSEMBLY__ */
 109
 110 /*
 111  * Do the CPU's IRQ-state tracing from assembly code. We call a
 112  * C function, so save all the C-clobbered registers:
 113  */
 114 #ifdef CONFIG_TRACE_IRQFLAGS
 115
 116 # define TRACE_IRQS_ON                          \
 117         pushl %eax;                             \
 118         pushl %ecx;                             \
 119         pushl %edx;                             \
 120         call trace_hardirqs_on;                 \
 121         popl %edx;                              \
 122         popl %ecx;                              \
 123         popl %eax;
 124
 125 # define TRACE_IRQS_OFF                         \
 126         pushl %eax;                             \
 127         pushl %ecx;                             \
 128         pushl %edx;                             \
 129         call trace_hardirqs_off;                \
 130         popl %edx;                              \
 131         popl %ecx;                              \
 132         popl %eax;
 133
 134 #else
 135 # define TRACE_IRQS_ON
 136 # define TRACE_IRQS_OFF
 137 #endif
 138
 139 #endif