irqflags.h

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/*
 * Copyright (C) 2012 ARM Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef __ASM_IRQFLAGS_H
#define __ASM_IRQFLAGS_H

#ifdef __KERNEL__

#include <asm/ptrace.h>

/*
 * CPU interrupt mask handling.
 */
static inline unsigned long arch_local_irq_save(void)
{
    unsigned long flags;
    asm volatile(
        "mrs    %0, daif        // arch_local_irq_save\n"
        "msr    daifset, #2"
        : "=r" (flags)
        :
        : "memory");
    return flags;
}

static inline void arch_local_irq_enable(void)
{
    asm volatile(
        "msr    daifclr, #2     // arch_local_irq_enable"
        :
        :
        : "memory");
}

static inline void arch_local_irq_disable(void)
{
    asm volatile(
        "msr    daifset, #2     // arch_local_irq_disable"
        :
        :
        : "memory");
}

#define local_fiq_enable()  asm("msr    daifclr, #1" : : : "memory")
#define local_fiq_disable() asm("msr    daifset, #1" : : : "memory")

/*
 * Save the current interrupt enable state.
 */
static inline unsigned long arch_local_save_flags(void)
{
    unsigned long flags;
    asm volatile(
        "mrs    %0, daif        // arch_local_save_flags"
        : "=r" (flags)
        :
        : "memory");
    return flags;
}

/*
 * restore saved IRQ state
 */
static inline void arch_local_irq_restore(unsigned long flags)
{
    asm volatile(
        "msr    daif, %0        // arch_local_irq_restore"
    :
    : "r" (flags)
    : "memory");
}

static inline int arch_irqs_disabled_flags(unsigned long flags)
{
    return flags & PSR_I_BIT;
}

#endif
#endif