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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>
/*
* Aarch64 has flags for masking: Debug, Asynchronous (serror), Interrupts and
* FIQ exceptions, in the 'daif' register. We mask and unmask them in 'dai'
* order:
* Masking debug exceptions causes all other exceptions to be masked too/
* Masking SError masks irq, but not debug exceptions. Masking irqs has no
* side effects for other flags. Keeping to this order makes it easier for
* entry.S to know which exceptions should be unmasked.
*
* FIQ is never expected, but we mask it when we disable debug exceptions, and
* unmask it at all other times.
*/
/*
* 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");
}
/*
* 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
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