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