root/include/asm-x86/irqflags.h

INCLUDED FROM

DEFINITIONS

1. native_save_fl
2. native_restore_fl
3. native_irq_disable
4. native_irq_enable
5. native_safe_halt
6. native_halt
7. __raw_local_save_flags
8. raw_local_irq_restore
9. raw_local_irq_disable
10. raw_local_irq_enable
11. raw_safe_halt
12. halt
13. __raw_local_irq_save
14. raw_irqs_disabled_flags
15. raw_irqs_disabled

#ifndef _X86_IRQFLAGS_H_
#define _X86_IRQFLAGS_H_

#include <asm/processor-flags.h>

#ifndef __ASSEMBLY__
/*
 * Interrupt control:
 */

static inline unsigned long native_save_fl(void)
{
        unsigned long flags;

        asm volatile("# __raw_save_flags\n\t"
                     "pushf ; pop %0"
                     : "=g" (flags)
                     : /* no input */
                     : "memory");

        return flags;
}

static inline void native_restore_fl(unsigned long flags)
{
        asm volatile("push %0 ; popf"
                     : /* no output */
                     :"g" (flags)
                     :"memory", "cc");
}

static inline void native_irq_disable(void)
{
        asm volatile("cli": : :"memory");
}

static inline void native_irq_enable(void)
{
        asm volatile("sti": : :"memory");
}

static inline void native_safe_halt(void)
{
        asm volatile("sti; hlt": : :"memory");
}

static inline void native_halt(void)
{
        asm volatile("hlt": : :"memory");
}

#endif

#ifdef CONFIG_PARAVIRT
#include <asm/paravirt.h>
#else
#ifndef __ASSEMBLY__

static inline unsigned long __raw_local_save_flags(void)
{
        return native_save_fl();
}

static inline void raw_local_irq_restore(unsigned long flags)
{
        native_restore_fl(flags);
}

static inline void raw_local_irq_disable(void)
{
        native_irq_disable();
}

static inline void raw_local_irq_enable(void)
{
        native_irq_enable();
}

/*
 * Used in the idle loop; sti takes one instruction cycle
 * to complete:
 */
static inline void raw_safe_halt(void)
{
        native_safe_halt();
}

/*
 * Used when interrupts are already enabled or to
 * shutdown the processor:
 */
static inline void halt(void)
{
        native_halt();
}

/*
 * 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 ENABLE_INTERRUPTS(x)    sti
#define DISABLE_INTERRUPTS(x)   cli

#ifdef CONFIG_X86_64
#define SWAPGS  swapgs
/*
 * Currently paravirt can't handle swapgs nicely when we
 * don't have a stack we can rely on (such as a user space
 * stack).  So we either find a way around these or just fault
 * and emulate if a guest tries to call swapgs directly.
 *
 * Either way, this is a good way to document that we don't
 * have a reliable stack. x86_64 only.
 */
#define SWAPGS_UNSAFE_STACK     swapgs

#define PARAVIRT_ADJUST_EXCEPTION_FRAME /*  */

#define INTERRUPT_RETURN        iretq
#define USERGS_SYSRET64                         \
        swapgs;                                 \
        sysretq;
#define USERGS_SYSRET32                         \
        swapgs;                                 \
        sysretl
#define ENABLE_INTERRUPTS_SYSEXIT32             \
        swapgs;                                 \
        sti;                                    \
        sysexit

#else
#define INTERRUPT_RETURN                iret
#define ENABLE_INTERRUPTS_SYSEXIT       sti; sysexit
#define GET_CR0_INTO_EAX                movl %cr0, %eax
#endif


#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 & X86_EFLAGS_IF);
}

static inline int raw_irqs_disabled(void)
{
        unsigned long flags = __raw_local_save_flags();

        return raw_irqs_disabled_flags(flags);
}

#else

#ifdef CONFIG_X86_64
#define ARCH_LOCKDEP_SYS_EXIT           call lockdep_sys_exit_thunk
#define ARCH_LOCKDEP_SYS_EXIT_IRQ       \
        TRACE_IRQS_ON; \
        sti; \
        SAVE_REST; \
        LOCKDEP_SYS_EXIT; \
        RESTORE_REST; \
        cli; \
        TRACE_IRQS_OFF;

#else
#define ARCH_LOCKDEP_SYS_EXIT                   \
        pushl %eax;                             \
        pushl %ecx;                             \
        pushl %edx;                             \
        call lockdep_sys_exit;                  \
        popl %edx;                              \
        popl %ecx;                              \
        popl %eax;

#define ARCH_LOCKDEP_SYS_EXIT_IRQ
#endif

#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      ARCH_LOCKDEP_SYS_EXIT
#  define LOCKDEP_SYS_EXIT_IRQ  ARCH_LOCKDEP_SYS_EXIT_IRQ
# else
#  define LOCKDEP_SYS_EXIT
#  define LOCKDEP_SYS_EXIT_IRQ
# endif

#endif /* __ASSEMBLY__ */
#endif