/* * 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> /* * 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"); } #define local_fiq_enable() asm("msr daifclr, #1" : : : "memory") #define local_fiq_disable() asm("msr daifset, #1" : : : "memory") #define local_async_enable() asm("msr daifclr, #4" : : : "memory") #define local_async_disable() asm("msr daifset, #4" : : : "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; } /* * save and restore debug state */ #define local_dbg_save(flags) \ do { \ typecheck(unsigned long, flags); \ asm volatile( \ "mrs %0, daif // local_dbg_save\n" \ "msr daifset, #8" \ : "=r" (flags) : : "memory"); \ } while (0) #define local_dbg_restore(flags) \ do { \ typecheck(unsigned long, flags); \ asm volatile( \ "msr daif, %0 // local_dbg_restore\n" \ : : "r" (flags) : "memory"); \ } while (0) #define local_dbg_enable() asm("msr daifclr, #8" : : : "memory") #define local_dbg_disable() asm("msr daifset, #8" : : : "memory") #endif #endif