Release 4.17 arch/arm64/include/asm/daifflags.h

/*
 * Copyright (C) 2017 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_DAIFFLAGS_H

#define __ASM_DAIFFLAGS_H

#include <linux/irqflags.h>


#define DAIF_PROCCTX		0

#define DAIF_PROCCTX_NOIRQ	PSR_I_BIT

/* mask/save/unmask/restore all exceptions, including interrupts. */


static inline void local_daif_mask(void)
{
	asm volatile(
                "msr    daifset, #0xf           // local_daif_mask\n"
                :
                :
                : "memory");
	trace_hardirqs_off();
}

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

	asm volatile(
                "mrs    %0, daif                // local_daif_save\n"
                : "=r" (flags)
                :
                : "memory");
	local_daif_mask();

	return flags;
}

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static inline void local_daif_unmask(void)
{
	trace_hardirqs_on();
	asm volatile(
                "msr    daifclr, #0xf           // local_daif_unmask"
                :
                :
                : "memory");
}

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static inline void local_daif_restore(unsigned long flags)
{
	if (!arch_irqs_disabled_flags(flags))
		trace_hardirqs_on();
	asm volatile(
                "msr    daif, %0                // local_daif_restore"
                :
                : "r" (flags)
                : "memory");
	if (arch_irqs_disabled_flags(flags))
		trace_hardirqs_off();
}

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#endif
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Directory: arch/arm64/include/asm

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