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/*
* include/asm-i386/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
#ifdef CONFIG_PARAVIRT
#include <asm/paravirt.h>
#else
#ifndef __ASSEMBLY__
static inline unsigned long __raw_local_save_flags(void)
{
unsigned long flags;
__asm__ __volatile__(
"pushfl ; popl %0"
: "=g" (flags)
: /* no input */
);
return flags;
}
static inline void raw_local_irq_restore(unsigned long flags)
{
__asm__ __volatile__(
"pushl %0 ; popfl"
: /* no output */
:"g" (flags)
:"memory", "cc"
);
}
static inline void raw_local_irq_disable(void)
{
__asm__ __volatile__("cli" : : : "memory");
}
static inline void raw_local_irq_enable(void)
{
__asm__ __volatile__("sti" : : : "memory");
}
/*
* 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");
}
/*
* 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;
}
#else
#define DISABLE_INTERRUPTS(clobbers) cli
#define ENABLE_INTERRUPTS(clobbers) sti
#define ENABLE_INTERRUPTS_SYSEXIT sti; sysexit
#define INTERRUPT_RETURN iret
#define GET_CR0_INTO_EAX movl %cr0, %eax
#endif /* __ASSEMBLY__ */
#endif /* CONFIG_PARAVIRT */
#ifndef __ASSEMBLY__
#define raw_local_save_flags(flags) \
do { (flags) = __raw_local_save_flags(); } while (0)
#define raw_local_irq_save(flags) \
do { (flags) = __raw_local_irq_save(); } while (0)
static inline int raw_irqs_disabled_flags(unsigned long flags)
{
return !(flags & (1 << 9));
}
static inline int raw_irqs_disabled(void)
{
unsigned long flags = __raw_local_save_flags();
return raw_irqs_disabled_flags(flags);
}
#endif /* __ASSEMBLY__ */
/*
* Do the CPU's IRQ-state tracing from assembly code. We call a
* C function, so save all the C-clobbered registers:
*/
#ifdef CONFIG_TRACE_IRQFLAGS
# define TRACE_IRQS_ON \
pushl %eax; \
pushl %ecx; \
pushl %edx; \
call trace_hardirqs_on; \
popl %edx; \
popl %ecx; \
popl %eax;
# define TRACE_IRQS_OFF \
pushl %eax; \
pushl %ecx; \
pushl %edx; \
call trace_hardirqs_off; \
popl %edx; \
popl %ecx; \
popl %eax;
#else
# define TRACE_IRQS_ON
# define TRACE_IRQS_OFF
#endif
#endif
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