153 lines
3.2 KiB
C
153 lines
3.2 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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#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 & ~(1 << 9)) | (1 << 18));
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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 | (1 << 9)) & ~(1 << 18));
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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 & (1<<9)) || (flags & (1 << 18));
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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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/**
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* raw_irqs_disabled_flags - Check the irq status in the processor flags
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* @flags: processor flags
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*
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* Tests the processor flags to see if the interrupt flag is disabled.
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* The ESX implementation is x86 specific.
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*
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* RETURN VALUE:
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* Returns 1 if the irq flags are disabled
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*
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*/
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/* _VMKLNX_CODECHECK_: raw_irqs_disabled_flags */
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static inline int raw_irqs_disabled_flags(unsigned long flags)
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{
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return !(flags & (1 << 9));
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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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* 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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#endif
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#endif
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