/*
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* Copyright (C) 2012 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ASM_IRQFLAGS_H
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#define __ASM_IRQFLAGS_H
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#ifdef __KERNEL__
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#include <asm/ptrace.h>
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/*
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* Aarch64 has flags for masking: Debug, Asynchronous (serror), Interrupts and
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* FIQ exceptions, in the 'daif' register. We mask and unmask them in 'dai'
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* order:
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* Masking debug exceptions causes all other exceptions to be masked too/
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* Masking SError masks irq, but not debug exceptions. Masking irqs has no
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* side effects for other flags. Keeping to this order makes it easier for
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* entry.S to know which exceptions should be unmasked.
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*
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* FIQ is never expected, but we mask it when we disable debug exceptions, and
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* unmask it at all other times.
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*/
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/*
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* CPU interrupt mask handling.
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*/
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static inline unsigned long arch_local_irq_save(void)
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{
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unsigned long flags;
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asm volatile(
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"mrs %0, daif // arch_local_irq_save\n"
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"msr daifset, #2"
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: "=r" (flags)
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:
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: "memory");
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return flags;
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}
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static inline void arch_local_irq_enable(void)
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{
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asm volatile(
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"msr daifclr, #2 // arch_local_irq_enable"
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:
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:
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: "memory");
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}
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static inline void arch_local_irq_disable(void)
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{
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asm volatile(
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"msr daifset, #2 // arch_local_irq_disable"
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:
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:
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: "memory");
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}
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/*
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* Save the current interrupt enable state.
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*/
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static inline unsigned long arch_local_save_flags(void)
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{
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unsigned long flags;
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asm volatile(
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"mrs %0, daif // arch_local_save_flags"
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: "=r" (flags)
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:
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: "memory");
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return flags;
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}
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/*
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* restore saved IRQ state
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*/
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static inline void arch_local_irq_restore(unsigned long flags)
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{
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asm volatile(
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"msr daif, %0 // arch_local_irq_restore"
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:
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: "r" (flags)
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: "memory");
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}
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static inline int arch_irqs_disabled_flags(unsigned long flags)
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{
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return flags & PSR_I_BIT;
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}
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#endif
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#endif
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