/* * 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; flags = arch_local_save_flags(); 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(); arch_local_irq_restore(flags); if (arch_irqs_disabled_flags(flags)) trace_hardirqs_off(); } #endif