143a5d325d
Ensure we fixup the IRQ state before we hit any locking code. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
198 lines
3.8 KiB
C
198 lines
3.8 KiB
C
/*
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* include/asm-i386/irqflags.h
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*
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* IRQ flags handling
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*
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* This file gets included from lowlevel asm headers too, to provide
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* wrapped versions of the local_irq_*() APIs, based on the
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* raw_local_irq_*() functions from the lowlevel headers.
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*/
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#ifndef _ASM_IRQFLAGS_H
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#define _ASM_IRQFLAGS_H
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#include <asm/processor-flags.h>
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#ifndef __ASSEMBLY__
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static inline unsigned long native_save_fl(void)
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{
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unsigned long f;
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asm volatile("pushfl ; popl %0":"=g" (f): /* no input */);
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return f;
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}
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static inline void native_restore_fl(unsigned long f)
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{
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asm volatile("pushl %0 ; popfl": /* no output */
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:"g" (f)
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:"memory", "cc");
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}
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static inline void native_irq_disable(void)
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{
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asm volatile("cli": : :"memory");
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}
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static inline void native_irq_enable(void)
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{
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asm volatile("sti": : :"memory");
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}
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static inline void native_safe_halt(void)
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{
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asm volatile("sti; hlt": : :"memory");
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}
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static inline void native_halt(void)
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{
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asm volatile("hlt": : :"memory");
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}
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#endif /* __ASSEMBLY__ */
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#ifdef CONFIG_PARAVIRT
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#include <asm/paravirt.h>
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#else
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#ifndef __ASSEMBLY__
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static inline unsigned long __raw_local_save_flags(void)
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{
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return native_save_fl();
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}
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static inline void raw_local_irq_restore(unsigned long flags)
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{
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native_restore_fl(flags);
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}
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static inline void raw_local_irq_disable(void)
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{
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native_irq_disable();
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}
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static inline void raw_local_irq_enable(void)
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{
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native_irq_enable();
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}
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/*
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* Used in the idle loop; sti takes one instruction cycle
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* to complete:
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*/
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static inline void raw_safe_halt(void)
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{
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native_safe_halt();
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}
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/*
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* Used when interrupts are already enabled or to
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* shutdown the processor:
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*/
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static inline void halt(void)
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{
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native_halt();
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}
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/*
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* For spinlocks, etc:
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*/
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static inline unsigned long __raw_local_irq_save(void)
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{
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unsigned long flags = __raw_local_save_flags();
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raw_local_irq_disable();
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return flags;
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}
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#else
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#define DISABLE_INTERRUPTS(clobbers) cli
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#define ENABLE_INTERRUPTS(clobbers) sti
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#define ENABLE_INTERRUPTS_SYSEXIT sti; sysexit
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#define INTERRUPT_RETURN iret
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#define GET_CR0_INTO_EAX movl %cr0, %eax
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#endif /* __ASSEMBLY__ */
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#endif /* CONFIG_PARAVIRT */
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#ifndef __ASSEMBLY__
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#define raw_local_save_flags(flags) \
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do { (flags) = __raw_local_save_flags(); } while (0)
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#define raw_local_irq_save(flags) \
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do { (flags) = __raw_local_irq_save(); } while (0)
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static inline int raw_irqs_disabled_flags(unsigned long flags)
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{
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return !(flags & X86_EFLAGS_IF);
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}
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static inline int raw_irqs_disabled(void)
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{
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unsigned long flags = __raw_local_save_flags();
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return raw_irqs_disabled_flags(flags);
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}
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/*
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* makes the traced hardirq state match with the machine state
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*
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* should be a rarely used function, only in places where its
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* otherwise impossible to know the irq state, like in traps.
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*/
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static inline void trace_hardirqs_fixup_flags(unsigned long flags)
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{
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if (raw_irqs_disabled_flags(flags))
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trace_hardirqs_off();
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else
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trace_hardirqs_on();
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}
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static inline void trace_hardirqs_fixup(void)
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{
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unsigned long flags = __raw_local_save_flags();
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trace_hardirqs_fixup_flags(flags);
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}
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#endif /* __ASSEMBLY__ */
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/*
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* Do the CPU's IRQ-state tracing from assembly code. We call a
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* C function, so save all the C-clobbered registers:
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*/
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#ifdef CONFIG_TRACE_IRQFLAGS
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# define TRACE_IRQS_ON \
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pushl %eax; \
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pushl %ecx; \
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pushl %edx; \
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call trace_hardirqs_on; \
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popl %edx; \
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popl %ecx; \
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popl %eax;
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# define TRACE_IRQS_OFF \
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pushl %eax; \
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pushl %ecx; \
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pushl %edx; \
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call trace_hardirqs_off; \
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popl %edx; \
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popl %ecx; \
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popl %eax;
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#else
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# define TRACE_IRQS_ON
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# define TRACE_IRQS_OFF
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#endif
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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# define LOCKDEP_SYS_EXIT \
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pushl %eax; \
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pushl %ecx; \
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pushl %edx; \
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call lockdep_sys_exit; \
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popl %edx; \
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popl %ecx; \
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popl %eax;
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#else
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# define LOCKDEP_SYS_EXIT
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#endif
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#endif
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