tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) 2012 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_IRQFLAGS_H
17#define __ASM_IRQFLAGS_H
18
19#ifdef __KERNEL__
20
21#include <asm/ptrace.h>
22
23/*
24 * CPU interrupt mask handling.
25 */
26static inline unsigned long arch_local_irq_save(void)
27{
28 unsigned long flags;
29 asm volatile(
30 "mrs %0, daif // arch_local_irq_save\n"
31 "msr daifset, #2"
32 : "=r" (flags)
33 :
34 : "memory");
35 return flags;
36}
37
38static inline void arch_local_irq_enable(void)
39{
40 asm volatile(
41 "msr daifclr, #2 // arch_local_irq_enable"
42 :
43 :
44 : "memory");
45}
46
47static inline void arch_local_irq_disable(void)
48{
49 asm volatile(
50 "msr daifset, #2 // arch_local_irq_disable"
51 :
52 :
53 : "memory");
54}
55
56#define local_fiq_enable() asm("msr daifclr, #1" : : : "memory")
57#define local_fiq_disable() asm("msr daifset, #1" : : : "memory")
58
59/*
60 * Save the current interrupt enable state.
61 */
62static inline unsigned long arch_local_save_flags(void)
63{
64 unsigned long flags;
65 asm volatile(
66 "mrs %0, daif // arch_local_save_flags"
67 : "=r" (flags)
68 :
69 : "memory");
70 return flags;
71}
72
73/*
74 * restore saved IRQ state
75 */
76static inline void arch_local_irq_restore(unsigned long flags)
77{
78 asm volatile(
79 "msr daif, %0 // arch_local_irq_restore"
80 :
81 : "r" (flags)
82 : "memory");
83}
84
85static inline int arch_irqs_disabled_flags(unsigned long flags)
86{
87 return flags & PSR_I_BIT;
88}
89
90#endif
91#endif