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>
177 lines
3.5 KiB
C
177 lines
3.5 KiB
C
/*
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* include/asm-x86_64/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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/*
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* Interrupt control:
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*/
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static inline unsigned long __raw_local_save_flags(void)
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{
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unsigned long flags;
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__asm__ __volatile__(
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"# __raw_save_flags\n\t"
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"pushfq ; popq %q0"
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: "=g" (flags)
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: /* no input */
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: "memory"
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);
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return flags;
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}
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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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static inline void raw_local_irq_restore(unsigned long flags)
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{
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__asm__ __volatile__(
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"pushq %0 ; popfq"
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: /* no output */
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:"g" (flags)
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:"memory", "cc"
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);
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}
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#ifdef CONFIG_X86_VSMP
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/*
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* Interrupt control for the VSMP architecture:
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*/
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static inline void raw_local_irq_disable(void)
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{
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unsigned long flags = __raw_local_save_flags();
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raw_local_irq_restore((flags & ~X86_EFLAGS_IF) | X86_EFLAGS_AC);
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}
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static inline void raw_local_irq_enable(void)
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{
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unsigned long flags = __raw_local_save_flags();
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raw_local_irq_restore((flags | X86_EFLAGS_IF) & (~X86_EFLAGS_AC));
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}
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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) || (flags & X86_EFLAGS_AC);
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}
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#else /* CONFIG_X86_VSMP */
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static inline void raw_local_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 raw_local_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 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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#endif
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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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#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(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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/*
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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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__asm__ __volatile__("sti; hlt" : : : "memory");
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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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__asm__ __volatile__("hlt": : :"memory");
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}
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#else /* __ASSEMBLY__: */
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# ifdef CONFIG_TRACE_IRQFLAGS
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# define TRACE_IRQS_ON call trace_hardirqs_on_thunk
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# define TRACE_IRQS_OFF call trace_hardirqs_off_thunk
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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 call lockdep_sys_exit_thunk
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# define LOCKDEP_SYS_EXIT_IRQ \
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TRACE_IRQS_ON; \
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sti; \
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SAVE_REST; \
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LOCKDEP_SYS_EXIT; \
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RESTORE_REST; \
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cli; \
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TRACE_IRQS_OFF;
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# else
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# define LOCKDEP_SYS_EXIT
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# define LOCKDEP_SYS_EXIT_IRQ
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# endif
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#endif
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#endif
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