/*
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* Copyright (C) 2017 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_DAIFFLAGS_H
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#define __ASM_DAIFFLAGS_H
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#include <linux/irqflags.h>
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#define DAIF_PROCCTX 0
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#define DAIF_PROCCTX_NOIRQ PSR_I_BIT
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/* mask/save/unmask/restore all exceptions, including interrupts. */
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static inline void local_daif_mask(void)
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{
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asm volatile(
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"msr daifset, #0xf // local_daif_mask\n"
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:
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:
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: "memory");
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trace_hardirqs_off();
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}
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static inline unsigned long local_daif_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 // local_daif_save\n"
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: "=r" (flags)
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:
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: "memory");
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local_daif_mask();
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return flags;
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}
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static inline void local_daif_unmask(void)
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{
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trace_hardirqs_on();
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asm volatile(
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"msr daifclr, #0xf // local_daif_unmask"
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:
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:
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: "memory");
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}
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static inline void local_daif_restore(unsigned long flags)
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{
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if (!arch_irqs_disabled_flags(flags))
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trace_hardirqs_on();
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asm volatile(
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"msr daif, %0 // local_daif_restore"
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:
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: "r" (flags)
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: "memory");
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if (arch_irqs_disabled_flags(flags))
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trace_hardirqs_off();
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}
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#endif
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