143 строки
2.7 KiB
C
143 строки
2.7 KiB
C
/*
|
|
* include/asm-x86_64/irqflags.h
|
|
*
|
|
* 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);
|
|
}
|
|
|
|
/*
|
|
* 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
|
|
#endif
|
|
|
|
#endif
|