hw_irq.h

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/*
 * Copyright (C) 1999 Cort Dougan <[email protected]>
 */
#ifndef _ASM_POWERPC_HW_IRQ_H
#define _ASM_POWERPC_HW_IRQ_H

#ifdef __KERNEL__

#include <linux/errno.h>
#include <linux/compiler.h>
#include <asm/ptrace.h>
#include <asm/processor.h>

#ifdef CONFIG_PPC64

/*
 * PACA flags in paca->irq_happened.
 *
 * This bits are set when interrupts occur while soft-disabled
 * and allow a proper replay. Additionally, PACA_IRQ_HARD_DIS
 * is set whenever we manually hard disable.
 */
#define PACA_IRQ_HARD_DIS   0x01
#define PACA_IRQ_DBELL      0x02
#define PACA_IRQ_EE     0x04
#define PACA_IRQ_DEC        0x08 /* Or FIT */
#define PACA_IRQ_EE_EDGE    0x10 /* BookE only */

#endif /* CONFIG_PPC64 */

#ifndef __ASSEMBLY__

extern void __replay_interrupt(unsigned int vector);

extern void timer_interrupt(struct pt_regs *);
extern void performance_monitor_exception(struct pt_regs *regs);
extern void WatchdogException(struct pt_regs *regs);
extern void unknown_exception(struct pt_regs *regs);

#ifdef CONFIG_PPC64
#include <asm/paca.h>

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

    asm volatile(
        "lbz %0,%1(13)"
        : "=r" (flags)
        : "i" (offsetof(struct paca_struct, soft_enabled)));

    return flags;
}

static inline unsigned long arch_local_irq_disable(void)
{
    unsigned long flags, zero;

    asm volatile(
        "li %1,0; lbz %0,%2(13); stb %1,%2(13)"
        : "=r" (flags), "=&r" (zero)
        : "i" (offsetof(struct paca_struct, soft_enabled))
        : "memory");

    return flags;
}

extern void arch_local_irq_restore(unsigned long);

static inline void arch_local_irq_enable(void)
{
    arch_local_irq_restore(1);
}

static inline unsigned long arch_local_irq_save(void)
{
    return arch_local_irq_disable();
}

static inline bool arch_irqs_disabled_flags(unsigned long flags)
{
    return flags == 0;
}

static inline bool arch_irqs_disabled(void)
{
    return arch_irqs_disabled_flags(arch_local_save_flags());
}

#ifdef CONFIG_PPC_BOOK3E
#define __hard_irq_enable() asm volatile("wrteei 1" : : : "memory")
#define __hard_irq_disable()    asm volatile("wrteei 0" : : : "memory")
#else
#define __hard_irq_enable() __mtmsrd(local_paca->kernel_msr | MSR_EE, 1)
#define __hard_irq_disable()    __mtmsrd(local_paca->kernel_msr, 1)
#endif

static inline void hard_irq_disable(void)
{
    __hard_irq_disable();
    get_paca()->soft_enabled = 0;
    get_paca()->irq_happened |= PACA_IRQ_HARD_DIS;
}

/* include/linux/interrupt.h needs hard_irq_disable to be a macro */
#define hard_irq_disable    hard_irq_disable

static inline bool lazy_irq_pending(void)
{
    return !!(get_paca()->irq_happened & ~PACA_IRQ_HARD_DIS);
}

/*
 * This is called by asynchronous interrupts to conditionally
 * re-enable hard interrupts when soft-disabled after having
 * cleared the source of the interrupt
 */
static inline void may_hard_irq_enable(void)
{
    get_paca()->irq_happened &= ~PACA_IRQ_HARD_DIS;
    if (!(get_paca()->irq_happened & PACA_IRQ_EE))
        __hard_irq_enable();
}

static inline bool arch_irq_disabled_regs(struct pt_regs *regs)
{
    return !regs->softe;
}

extern bool prep_irq_for_idle(void);

#else /* CONFIG_PPC64 */

#define SET_MSR_EE(x)   mtmsr(x)

static inline unsigned long arch_local_save_flags(void)
{
    return mfmsr();
}

static inline void arch_local_irq_restore(unsigned long flags)
{
#if defined(CONFIG_BOOKE)
    asm volatile("wrtee %0" : : "r" (flags) : "memory");
#else
    mtmsr(flags);
#endif
}

static inline unsigned long arch_local_irq_save(void)
{
    unsigned long flags = arch_local_save_flags();
#ifdef CONFIG_BOOKE
    asm volatile("wrteei 0" : : : "memory");
#else
    SET_MSR_EE(flags & ~MSR_EE);
#endif
    return flags;
}

static inline void arch_local_irq_disable(void)
{
#ifdef CONFIG_BOOKE
    asm volatile("wrteei 0" : : : "memory");
#else
    arch_local_irq_save();
#endif
}

static inline void arch_local_irq_enable(void)
{
#ifdef CONFIG_BOOKE
    asm volatile("wrteei 1" : : : "memory");
#else
    unsigned long msr = mfmsr();
    SET_MSR_EE(msr | MSR_EE);
#endif
}

static inline bool arch_irqs_disabled_flags(unsigned long flags)
{
    return (flags & MSR_EE) == 0;
}

static inline bool arch_irqs_disabled(void)
{
    return arch_irqs_disabled_flags(arch_local_save_flags());
}

#define hard_irq_disable()      arch_local_irq_disable()

static inline bool arch_irq_disabled_regs(struct pt_regs *regs)
{
    return !(regs->msr & MSR_EE);
}

static inline void may_hard_irq_enable(void) { }

#endif /* CONFIG_PPC64 */

#define ARCH_IRQ_INIT_FLAGS IRQ_NOREQUEST

/*
 * interrupt-retrigger: should we handle this via lost interrupts and IPIs
 * or should we not care like we do now ? --BenH.
 */
struct irq_chip;

#endif  /* __ASSEMBLY__ */
#endif  /* __KERNEL__ */
#endif  /* _ASM_POWERPC_HW_IRQ_H */