1 /* 2 * Copyright (C) 2017 ARM Ltd. 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 * 13 * You should have received a copy of the GNU General Public License 14 * along with this program. If not, see <http://www.gnu.org/licenses/>. 15 */ 16 #ifndef __ASM_DAIFFLAGS_H 17 #define __ASM_DAIFFLAGS_H 18 19 #include <linux/irqflags.h> 20 21 #define DAIF_PROCCTX 0 22 #define DAIF_PROCCTX_NOIRQ PSR_I_BIT 23 24 /* mask/save/unmask/restore all exceptions, including interrupts. */ 25 static inline void local_daif_mask(void) 26 { 27 asm volatile( 28 "msr daifset, #0xf // local_daif_mask\n" 29 : 30 : 31 : "memory"); 32 trace_hardirqs_off(); 33 } 34 35 static inline unsigned long local_daif_save(void) 36 { 37 unsigned long flags; 38 39 flags = arch_local_save_flags(); 40 41 local_daif_mask(); 42 43 return flags; 44 } 45 46 static inline void local_daif_unmask(void) 47 { 48 trace_hardirqs_on(); 49 asm volatile( 50 "msr daifclr, #0xf // local_daif_unmask" 51 : 52 : 53 : "memory"); 54 } 55 56 static inline void local_daif_restore(unsigned long flags) 57 { 58 if (!arch_irqs_disabled_flags(flags)) 59 trace_hardirqs_on(); 60 61 arch_local_irq_restore(flags); 62 63 if (arch_irqs_disabled_flags(flags)) 64 trace_hardirqs_off(); 65 } 66 67 #endif 68