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/*
* IRQ flags handling
*
* This file gets included from lowlevel asm headers too, to provide
* wrapped versions of the local_irq_*() APIs, based on the
* raw_local_irq_*() functions from the lowlevel headers.
*/
#ifndef _ASM_IRQFLAGS_H
#define _ASM_IRQFLAGS_H
#include <asm/processor-flags.h>
#ifndef __ASSEMBLY__
/*
* Interrupt control:
*/
static inline unsigned long __raw_local_save_flags(void)
{
unsigned long flags;
__asm__ __volatile__(
"# __raw_save_flags\n\t"
"pushfq ; popq %q0"
: "=g" (flags)
: /* no input */
: "memory"
);
return flags;
}
#define raw_local_save_flags(flags) \
do { (flags) = __raw_local_save_flags(); } while (0)
static inline void raw_local_irq_restore(unsigned long flags)
{
__asm__ __volatile__(
"pushq %0 ; popfq"
: /* no output */
:"g" (flags)
:"memory", "cc"
);
}
#ifdef CONFIG_X86_VSMP
/*
* Interrupt control for the VSMP architecture:
*/
static inline void raw_local_irq_disable(void)
{
unsigned long flags = __raw_local_save_flags();
raw_local_irq_restore((flags & ~X86_EFLAGS_IF) | X86_EFLAGS_AC);
}
static inline void raw_local_irq_enable(void)
{
unsigned long flags = __raw_local_save_flags();
raw_local_irq_restore((flags | X86_EFLAGS_IF) & (~X86_EFLAGS_AC));
}
static inline int raw_irqs_disabled_flags(unsigned long flags)
{
return !(flags & X86_EFLAGS_IF) || (flags & X86_EFLAGS_AC);
}
#else /* CONFIG_X86_VSMP */
static inline void raw_local_irq_disable(void)
{
__asm__ __volatile__("cli" : : : "memory");
}
static inline void raw_local_irq_enable(void)
{
__asm__ __volatile__("sti" : : : "memory");
}
static inline int raw_irqs_disabled_flags(unsigned long flags)
{
return !(flags & X86_EFLAGS_IF);
}
#endif
/*
* For spinlocks, etc.:
*/
static inline unsigned long __raw_local_irq_save(void)
{
unsigned long flags = __raw_local_save_flags();
raw_local_irq_disable();
return flags;
}
#define raw_local_irq_save(flags) \
do { (flags) = __raw_local_irq_save(); } while (0)
static inline int raw_irqs_disabled(void)
{
unsigned long flags = __raw_local_save_flags();
return raw_irqs_disabled_flags(flags);
}
/*
* makes the traced hardirq state match with the machine state
*
* should be a rarely used function, only in places where its
* otherwise impossible to know the irq state, like in traps.
*/
static inline void trace_hardirqs_fixup_flags(unsigned long flags)
{
if (raw_irqs_disabled_flags(flags))
trace_hardirqs_off();
else
trace_hardirqs_on();
}
static inline void trace_hardirqs_fixup(void)
{
unsigned long flags = __raw_local_save_flags();
trace_hardirqs_fixup_flags(flags);
}
/*
* Used in the idle loop; sti takes one instruction cycle
* to complete:
*/
static inline void raw_safe_halt(void)
{
__asm__ __volatile__("sti; hlt" : : : "memory");
}
/*
* Used when interrupts are already enabled or to
* shutdown the processor:
*/
static inline void halt(void)
{
__asm__ __volatile__("hlt": : :"memory");
}
#else /* __ASSEMBLY__: */
# ifdef CONFIG_TRACE_IRQFLAGS
# define TRACE_IRQS_ON call trace_hardirqs_on_thunk
# define TRACE_IRQS_OFF call trace_hardirqs_off_thunk
# else
# define TRACE_IRQS_ON
# define TRACE_IRQS_OFF
# endif
# ifdef CONFIG_DEBUG_LOCK_ALLOC
# define LOCKDEP_SYS_EXIT call lockdep_sys_exit_thunk
# define LOCKDEP_SYS_EXIT_IRQ \
TRACE_IRQS_ON; \
sti; \
SAVE_REST; \
LOCKDEP_SYS_EXIT; \
RESTORE_REST; \
cli; \
TRACE_IRQS_OFF;
# else
# define LOCKDEP_SYS_EXIT
# define LOCKDEP_SYS_EXIT_IRQ
# endif
#endif
#endif
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