include/asm-x86/irqflags_32.h

   1 /*
   2  * IRQ flags handling
   3  *
   4  * This file gets included from lowlevel asm headers too, to provide
   5  * wrapped versions of the local_irq_*() APIs, based on the
   6  * raw_local_irq_*() functions from the lowlevel headers.
   7  */
   8 #ifndef _ASM_IRQFLAGS_H
   9 #define _ASM_IRQFLAGS_H
  10 #include <asm/processor-flags.h>
  11
  12 #ifndef __ASSEMBLY__
  13 static inline unsigned long native_save_fl(void)
  14 {
  15         unsigned long f;
  16         asm volatile("pushfl ; popl %0":"=g" (f): /* no input */);
  17         return f;
  18 }
  19
  20 static inline void native_restore_fl(unsigned long f)
  21 {
  22         asm volatile("pushl %0 ; popfl": /* no output */
  23                              :"g" (f)
  24                              :"memory", "cc");
  25 }
  26
  27 static inline void native_irq_disable(void)
  28 {
  29         asm volatile("cli": : :"memory");
  30 }
  31
  32 static inline void native_irq_enable(void)
  33 {
  34         asm volatile("sti": : :"memory");
  35 }
  36
  37 static inline void native_safe_halt(void)
  38 {
  39         asm volatile("sti; hlt": : :"memory");
  40 }
  41
  42 static inline void native_halt(void)
  43 {
  44         asm volatile("hlt": : :"memory");
  45 }
  46 #endif  /* __ASSEMBLY__ */
  47
  48 #ifdef CONFIG_PARAVIRT
  49 #include <asm/paravirt.h>
  50 #else
  51 #ifndef __ASSEMBLY__
  52
  53 static inline unsigned long __raw_local_save_flags(void)
  54 {
  55         return native_save_fl();
  56 }
  57
  58 static inline void raw_local_irq_restore(unsigned long flags)
  59 {
  60         native_restore_fl(flags);
  61 }
  62
  63 static inline void raw_local_irq_disable(void)
  64 {
  65         native_irq_disable();
  66 }
  67
  68 static inline void raw_local_irq_enable(void)
  69 {
  70         native_irq_enable();
  71 }
  72
  73 /*
  74  * Used in the idle loop; sti takes one instruction cycle
  75  * to complete:
  76  */
  77 static inline void raw_safe_halt(void)
  78 {
  79         native_safe_halt();
  80 }
  81
  82 /*
  83  * Used when interrupts are already enabled or to
  84  * shutdown the processor:
  85  */
  86 static inline void halt(void)
  87 {
  88         native_halt();
  89 }
  90
  91 /*
  92  * For spinlocks, etc:
  93  */
  94 static inline unsigned long __raw_local_irq_save(void)
  95 {
  96         unsigned long flags = __raw_local_save_flags();
  97
  98         raw_local_irq_disable();
  99
 100         return flags;
 101 }
 102
 103 #else
 104 #define DISABLE_INTERRUPTS(clobbers)    cli
 105 #define ENABLE_INTERRUPTS(clobbers)     sti
 106 #define ENABLE_INTERRUPTS_SYSEXIT       sti; sysexit
 107 #define INTERRUPT_RETURN                iret
 108 #define GET_CR0_INTO_EAX                movl %cr0, %eax
 109 #endif /* __ASSEMBLY__ */
 110 #endif /* CONFIG_PARAVIRT */
 111
 112 #ifndef __ASSEMBLY__
 113 #define raw_local_save_flags(flags) \
 114                 do { (flags) = __raw_local_save_flags(); } while (0)
 115
 116 #define raw_local_irq_save(flags) \
 117                 do { (flags) = __raw_local_irq_save(); } while (0)
 118
 119 static inline int raw_irqs_disabled_flags(unsigned long flags)
 120 {
 121         return !(flags & X86_EFLAGS_IF);
 122 }
 123
 124 static inline int raw_irqs_disabled(void)
 125 {
 126         unsigned long flags = __raw_local_save_flags();
 127
 128         return raw_irqs_disabled_flags(flags);
 129 }
 130
 131 /*
 132  * makes the traced hardirq state match with the machine state
 133  *
 134  * should be a rarely used function, only in places where its
 135  * otherwise impossible to know the irq state, like in traps.
 136  */
 137 static inline void trace_hardirqs_fixup_flags(unsigned long flags)
 138 {
 139         if (raw_irqs_disabled_flags(flags))
 140                 trace_hardirqs_off();
 141         else
 142                 trace_hardirqs_on();
 143 }
 144
 145 static inline void trace_hardirqs_fixup(void)
 146 {
 147         unsigned long flags = __raw_local_save_flags();
 148
 149         trace_hardirqs_fixup_flags(flags);
 150 }
 151 #endif /* __ASSEMBLY__ */
 152
 153 /*
 154  * Do the CPU's IRQ-state tracing from assembly code. We call a
 155  * C function, so save all the C-clobbered registers:
 156  */
 157 #ifdef CONFIG_TRACE_IRQFLAGS
 158
 159 # define TRACE_IRQS_ON                          \
 160         pushl %eax;                             \
 161         pushl %ecx;                             \
 162         pushl %edx;                             \
 163         call trace_hardirqs_on;                 \
 164         popl %edx;                              \
 165         popl %ecx;                              \
 166         popl %eax;
 167
 168 # define TRACE_IRQS_OFF                         \
 169         pushl %eax;                             \
 170         pushl %ecx;                             \
 171         pushl %edx;                             \
 172         call trace_hardirqs_off;                \
 173         popl %edx;                              \
 174         popl %ecx;                              \
 175         popl %eax;
 176
 177 #else
 178 # define TRACE_IRQS_ON
 179 # define TRACE_IRQS_OFF
 180 #endif
 181
 182 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 183 # define LOCKDEP_SYS_EXIT                       \
 184         pushl %eax;                             \
 185         pushl %ecx;                             \
 186         pushl %edx;                             \
 187         call lockdep_sys_exit;                  \
 188         popl %edx;                              \
 189         popl %ecx;                              \
 190         popl %eax;
 191 #else
 192 # define LOCKDEP_SYS_EXIT
 193 #endif
 194
 195 #endif